/* roulang page: index */
:root {
            --color-primary: #1D6FD1;
            --color-primary-hover: #155ABD;
            --color-accent: #E8952B;
            --color-bg: #F7F9FC;
            --color-surface: #FFFFFF;
            --color-text: #1A1F2E;
            --color-text-secondary: #5A6472;
            --color-border: #E1E8F0;
            --color-success: #2F9E5F;
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-pill: 999px;
            --shadow-card: 0 2px 14px rgba(26,31,46,0.06);
            --shadow-card-hover: 0 8px 28px rgba(26,31,46,0.12);
            --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            --container-max: 1200px;
            --section-padding: 72px 0;
            --section-padding-mobile: 44px 0;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 15.5px;
            line-height: 1.8;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-bottom: 72px;
        }
        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color 180ms ease;
        }
        a:hover {
            color: var(--color-primary-hover);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-card);
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            font-size: 15px;
        }
        input {
            font-family: inherit;
            font-size: 15px;
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 8px rgba(26,31,46,0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 64px;
            gap: 20px;
        }
        .logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .logo .logo-dot {
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--color-accent);
            margin-right: 4px;
        }
        .logo a {
            color: var(--color-primary);
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .logo a:hover {
            color: var(--color-primary-hover);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-item {
            position: relative;
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text);
            border-radius: var(--radius-btn);
            transition: background 180ms ease, color 180ms ease;
            cursor: pointer;
            white-space: nowrap;
        }
        .nav-item a {
            color: inherit;
        }
        .nav-item:hover {
            background: #F0F5FC;
            color: var(--color-primary);
        }
        .nav-item.active {
            color: var(--color-primary);
            background: #EDF4FC;
        }
        .nav-item .arrow {
            font-size: 10px;
            margin-left: 3px;
            display: inline-block;
            transition: transform 180ms ease;
        }
        .nav-item.has-dropdown:hover .arrow {
            transform: rotate(180deg);
        }

        .dropdown-panel {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            min-width: 260px;
            background: var(--color-surface);
            border-radius: 10px;
            box-shadow: var(--shadow-card-hover);
            border: 1px solid var(--color-border);
            padding: 16px;
            z-index: 200;
        }
        .nav-item.has-dropdown:hover .dropdown-panel {
            display: block;
        }
        .dropdown-panel .dropdown-label {
            font-size: 12px;
            font-weight: 700;
            color: var(--color-accent);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 10px;
        }
        .dropdown-panel a {
            display: block;
            padding: 6px 10px;
            font-size: 13px;
            font-weight: 400;
            color: var(--color-text-secondary);
            border-radius: 6px;
            transition: background 150ms ease, color 150ms ease;
        }
        .dropdown-panel a:hover {
            background: #F0F5FC;
            color: var(--color-primary);
        }
        .dropdown-panel .dropdown-item-group {
            margin-bottom: 12px;
        }
        .dropdown-panel .dropdown-item-group:last-child {
            margin-bottom: 0;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            background: transparent;
            border: 1px solid var(--color-border);
            cursor: pointer;
        }
        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--color-text);
            border-radius: 2px;
            transition: all 200ms ease;
        }
        #nav-checkbox {
            display: none;
        }

        /* ===== Section Base ===== */
        .section {
            padding: var(--section-padding);
            position: relative;
        }
        .section-alt {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }
        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: 1px;
            margin-bottom: 8px;
            text-transform: uppercase;
        }
        .section-title {
            font-size: 26px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--color-text);
            margin-bottom: 12px;
        }
        .section-desc {
            font-size: 15.5px;
            color: var(--color-text-secondary);
            max-width: 760px;
            line-height: 1.8;
            margin-bottom: 28px;
        }

        /* ===== Hero ===== */
        .hero {
            background: linear-gradient(180deg, #EFF6FF 0%, #F7F9FC 100%);
            padding: 90px 0 72px;
            position: relative;
            overflow: hidden;
        }
        .hero-inner {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .hero-text h1 {
            font-size: 34px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--color-text);
            margin-bottom: 16px;
        }
        .hero-text .hero-subtitle {
            font-size: 17px;
            color: var(--color-text-secondary);
            line-height: 1.75;
            margin-bottom: 24px;
            max-width: 540px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 20px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 24px;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 600;
            transition: all 180ms ease;
            white-space: nowrap;
            min-height: 44px;
        }
        .btn-primary {
            background: var(--color-primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--color-primary-hover);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(29,111,209,0.3);
        }
        .btn-secondary {
            background: transparent;
            border: 1px solid var(--color-primary);
            color: var(--color-primary);
        }
        .btn-secondary:hover {
            background: #EBF3FC;
            color: var(--color-primary-hover);
            transform: translateY(-1px);
        }
        .btn-accent {
            background: var(--color-accent);
            color: #fff;
        }
        .btn-accent:hover {
            background: #D07F1F;
            color: #fff;
            transform: translateY(-1px);
            box-shadow: 0 4px 14px rgba(232,149,43,0.3);
        }
        .hero-trust {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 13px;
            color: var(--color-text-secondary);
        }
        .hero-trust .trust-item {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .trust-dot {
            display: inline-block;
            width: 8px;
            height: 8px;
            border-radius: 50%;
            background: var(--color-success);
        }
        .hero-figure {
            position: relative;
            border-radius: var(--radius-card);
            overflow: hidden;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
            aspect-ratio: 4/3;
            background: var(--color-surface);
        }
        .hero-figure img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 0;
        }

        /* ===== Data Bar ===== */
        .data-bar {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .data-item {
            text-align: center;
            padding: 20px 12px;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
        }
        .data-number {
            font-size: 28px;
            font-weight: 700;
            color: var(--color-primary);
            font-family: "Georgia", "Times New Roman", serif;
            letter-spacing: 1px;
        }
        .data-label {
            font-size: 13px;
            color: var(--color-text-secondary);
            margin-top: 4px;
        }

        /* ===== Cards ===== */
        .card-grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .card-grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .card-grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 24px;
            transition: all 180ms ease;
        }
        .card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }
        .card-icon {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            margin-bottom: 14px;
            background: #F0F5FC;
            color: var(--color-primary);
        }
        .card-icon.accent {
            background: #FDF5EA;
            color: var(--color-accent);
        }
        .card-icon.green {
            background: #EAF7EF;
            color: var(--color-success);
        }
        .card h3 {
            font-size: 19px;
            font-weight: 600;
            line-height: 1.45;
            margin-bottom: 8px;
            color: var(--color-text);
        }
        .card p {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.7;
        }

        /* ===== Category Entrance ===== */
        .category-grid-6 {
            display: grid;
            grid-template-columns: repeat(6, 1fr);
            gap: 14px;
        }
        .category-entry {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 18px 14px;
            text-align: center;
            transition: all 180ms ease;
            box-shadow: var(--shadow-card);
            display: block;
            color: var(--color-text);
        }
        .category-entry:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            color: var(--color-primary);
            border-color: var(--color-primary);
        }
        .category-entry .cat-name {
            font-size: 15px;
            font-weight: 600;
            margin-bottom: 4px;
            color: var(--color-text);
        }
        .category-entry:hover .cat-name {
            color: var(--color-primary);
        }
        .category-entry .cat-desc {
            font-size: 12px;
            color: var(--color-text-secondary);
            line-height: 1.5;
        }
        .category-entry .cat-arrow {
            display: inline-block;
            margin-top: 8px;
            font-size: 16px;
            color: var(--color-accent);
            transition: transform 180ms ease;
        }
        .category-entry:hover .cat-arrow {
            transform: translateX(4px);
        }

        /* ===== Article Cards ===== */
        .article-card {
            display: flex;
            gap: 16px;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 16px;
            box-shadow: var(--shadow-card);
            transition: all 180ms ease;
            cursor: pointer;
        }
        .article-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: #CBD8E8;
        }
        .article-card .article-img {
            width: 160px;
            height: 120px;
            flex-shrink: 0;
            border-radius: 10px;
            overflow: hidden;
            background: #EEF2F7;
        }
        .article-card .article-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 10px;
        }
        .article-card .article-body {
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            min-width: 0;
        }
        .article-card .article-tag {
            font-size: 11px;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: 0.5px;
            text-transform: uppercase;
            margin-bottom: 4px;
        }
        .article-card .article-title {
            font-size: 16px;
            font-weight: 600;
            color: var(--color-text);
            line-height: 1.45;
            margin-bottom: 6px;
        }
        .article-card .article-excerpt {
            font-size: 13px;
            color: var(--color-text-secondary);
            line-height: 1.6;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .article-card .article-date {
            font-size: 12px;
            color: #8B95A3;
            margin-top: 8px;
        }

        /* ===== Testimonial ===== */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .testimonial-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 20px;
            box-shadow: var(--shadow-card);
        }
        .testimonial-card .quote-mark {
            font-size: 28px;
            color: var(--color-accent);
            line-height: 1;
            margin-bottom: 8px;
        }
        .testimonial-card .quote-text {
            font-size: 14px;
            color: var(--color-text);
            line-height: 1.7;
            margin-bottom: 12px;
        }
        .testimonial-card .quote-author {
            font-size: 13px;
            font-weight: 600;
            color: var(--color-text);
        }
        .testimonial-card .quote-role {
            font-size: 12px;
            color: var(--color-text-secondary);
        }

        /* ===== Comparison ===== */
        .comparison-wrap {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }
        .comparison-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 24px;
            box-shadow: var(--shadow-card);
        }
        .comparison-card.highlight {
            border-color: var(--color-primary);
            background: #F9FBFF;
        }
        .comparison-card .comparison-title {
            font-size: 17px;
            font-weight: 700;
            margin-bottom: 14px;
            color: var(--color-text);
        }
        .comparison-card.highlight .comparison-title {
            color: var(--color-primary);
        }
        .comparison-list {
            list-style: none;
        }
        .comparison-list li {
            padding: 8px 0;
            font-size: 14px;
            color: var(--color-text-secondary);
            border-bottom: 1px solid #F0F3F7;
            display: flex;
            align-items: flex-start;
            gap: 8px;
        }
        .comparison-list li:last-child {
            border-bottom: none;
        }
        .comparison-list .check {
            color: var(--color-success);
            font-weight: 700;
            flex-shrink: 0;
        }
        .comparison-list .cross {
            color: #B0B8C4;
            font-weight: 700;
            flex-shrink: 0;
        }

        /* ===== Info List ===== */
        .info-list {
            list-style: none;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            overflow: hidden;
        }
        .info-list li {
            padding: 14px 20px;
            border-bottom: 1px solid #F0F3F7;
            display: flex;
            gap: 14px;
            align-items: baseline;
        }
        .info-list li:last-child {
            border-bottom: none;
        }
        .info-list .info-date {
            font-size: 13px;
            font-weight: 600;
            color: var(--color-primary);
            white-space: nowrap;
            min-width: 80px;
        }
        .info-list .info-text {
            font-size: 14px;
            color: var(--color-text);
        }

        /* ===== Culture / Knowledge ===== */
        .culture-article {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: center;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 32px;
            box-shadow: var(--shadow-card);
        }
        .culture-article .culture-text h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--color-text);
        }
        .culture-article .culture-text p {
            font-size: 15px;
            color: var(--color-text-secondary);
            line-height: 1.8;
            margin-bottom: 10px;
        }
        .culture-article .culture-img {
            border-radius: var(--radius-card);
            overflow: hidden;
            border: 1px solid var(--color-border);
            aspect-ratio: 4/3;
        }
        .culture-article .culture-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .knowledge-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 14px;
        }
        .knowledge-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 18px;
            box-shadow: var(--shadow-card);
            transition: all 180ms ease;
        }
        .knowledge-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }
        .knowledge-card .k-number {
            font-size: 22px;
            font-weight: 700;
            color: var(--color-accent);
            margin-bottom: 6px;
        }
        .knowledge-card h4 {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 4px;
        }
        .knowledge-card p {
            font-size: 13px;
            color: var(--color-text-secondary);
            line-height: 1.6;
        }

        /* ===== Brand Intro ===== */
        .brand-intro {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 32px;
            box-shadow: var(--shadow-card);
        }
        .brand-intro p {
            font-size: 15.5px;
            color: var(--color-text);
            line-height: 1.85;
            margin-bottom: 14px;
        }
        .brand-intro p:last-child {
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 820px;
        }
        .faq-item {
            padding: 16px 0;
            border-bottom: 1px solid #E8EDF3;
        }
        .faq-item:first-child {
            padding-top: 0;
        }
        .faq-item .faq-question {
            font-size: 16px;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 6px;
            display: flex;
            align-items: baseline;
            gap: 10px;
        }
        .faq-item .faq-question .faq-number {
            color: var(--color-primary);
            font-weight: 700;
            font-size: 15px;
            flex-shrink: 0;
        }
        .faq-item .faq-answer {
            font-size: 14.5px;
            color: var(--color-text-secondary);
            line-height: 1.75;
            padding-left: 28px;
        }

        /* ===== Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .step-card {
            text-align: center;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 24px 18px;
            box-shadow: var(--shadow-card);
            position: relative;
        }
        .step-card .step-number {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--color-primary);
            color: #fff;
            font-weight: 700;
            font-size: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 12px;
        }
        .step-card h4 {
            font-size: 16px;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 6px;
        }
        .step-card p {
            font-size: 13px;
            color: var(--color-text-secondary);
            line-height: 1.6;
        }

        /* ===== Guarantee ===== */
        .guarantee-bar {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }
        .guarantee-item {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 14px 16px;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            font-size: 13.5px;
            color: var(--color-text);
            font-weight: 500;
        }
        .guarantee-item .g-icon {
            width: 32px;
            height: 32px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: #EAF7EF;
            color: var(--color-success);
            font-size: 16px;
            flex-shrink: 0;
        }

        /* ===== Fixed Bottom CTA ===== */
        .fixed-cta {
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            background: var(--color-surface);
            box-shadow: 0 -2px 16px rgba(26,31,46,0.1);
            padding: 12px 24px;
            z-index: 80;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            border-top: 1px solid var(--color-border);
            transition: transform 200ms ease;
        }
        .fixed-cta.closed {
            transform: translateY(100%);
        }
        .fixed-cta .cta-text {
            font-size: 14px;
            font-weight: 500;
            color: var(--color-text);
        }
        .fixed-cta .cta-close {
            position: absolute;
            right: 16px;
            top: 50%;
            transform: translateY(-50%);
            width: 28px;
            height: 28px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            color: #8B95A3;
            cursor: pointer;
            transition: all 150ms ease;
            background: #F5F7FA;
            border: 1px solid var(--color-border);
        }
        .fixed-cta .cta-close:hover {
            color: #D32F2F;
            background: #FDECEC;
            border-color: #E8C4C4;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #1A1F2E;
            color: #C7D2E3;
            padding: 48px 0 24px;
            font-size: 14px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer-brand h3 {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
        }
        .footer-brand p {
            font-size: 13px;
            color: #A8B3C5;
            line-height: 1.7;
        }
        .footer-links h4 {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            margin-bottom: 12px;
        }
        .footer-links a {
            display: block;
            color: #C7D2E3;
            font-size: 13px;
            padding: 4px 0;
            transition: color 150ms ease;
        }
        .footer-links a:hover {
            color: #fff;
        }
        .footer-bottom {
            border-top: 1px solid #2A3345;
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 12px;
            color: #8B95A3;
        }
        .footer-bottom .beian {
            font-family: "SF Mono", "Consolas", monospace;
            font-size: 12px;
            letter-spacing: 0.3px;
        }
        .footer-bottom a {
            color: #C7D2E3;
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .hero-inner {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .hero {
                padding: 56px 0 48px;
            }
            .hero-text h1 {
                font-size: 28px;
            }
            .card-grid-4 {
                grid-template-columns: repeat(2, 1fr);
            }
            .knowledge-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .category-grid-6 {
                grid-template-columns: repeat(3, 1fr);
            }
            .testimonial-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .guarantee-bar {
                grid-template-columns: repeat(2, 1fr);
            }
            .culture-article {
                grid-template-columns: 1fr;
            }
            .comparison-wrap {
                grid-template-columns: 1fr;
            }
            .data-bar {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 28px;
            }
            .main-nav {
                gap: 2px;
            }
            .nav-item {
                padding: 8px 8px;
                font-size: 13px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-padding: 44px 0;
            }
            .section {
                padding: var(--section-padding);
            }
            .card-grid-3 {
                grid-template-columns: 1fr;
            }
            .card-grid-2 {
                grid-template-columns: 1fr;
            }
            .card-grid-4 {
                grid-template-columns: 1fr;
            }
            .knowledge-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .category-grid-6 {
                grid-template-columns: repeat(2, 1fr);
            }
            .testimonial-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .guarantee-bar {
                grid-template-columns: 1fr;
            }
            .article-card {
                flex-direction: column;
            }
            .article-card .article-img {
                width: 100%;
                height: 180px;
            }
            .data-bar {
                grid-template-columns: repeat(2, 1fr);
                gap: 12px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .hero-text h1 {
                font-size: 24px;
            }
            .hero-text .hero-subtitle {
                font-size: 15px;
            }

            /* Mobile Nav */
            .nav-toggle {
                display: flex;
            }
            #nav-checkbox:checked ~ .main-nav {
                display: flex;
                flex-direction: column;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: var(--color-surface);
                border-bottom: 1px solid var(--color-border);
                box-shadow: var(--shadow-card);
                padding: 12px 20px;
                max-height: 70vh;
                overflow-y: auto;
                align-items: flex-start;
                gap: 2px;
            }
            .main-nav {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: var(--color-surface);
                border-bottom: 1px solid var(--color-border);
                box-shadow: var(--shadow-card);
                padding: 12px 20px;
                max-height: 70vh;
                overflow-y: auto;
                align-items: flex-start;
                flex-direction: column;
                gap: 2px;
                z-index: 150;
            }
            .nav-item {
                width: 100%;
                padding: 10px 6px;
                font-size: 14px;
                border-bottom: 1px solid #F0F3F7;
            }
            .nav-item.has-dropdown .dropdown-panel {
                position: static;
                display: none;
                box-shadow: none;
                border: none;
                padding: 8px 0 8px 16px;
                min-width: auto;
                background: #F8FAFD;
            }
            .nav-item.has-dropdown:hover .dropdown-panel {
                display: block;
            }
            .fixed-cta {
                padding: 10px 16px;
                gap: 10px;
            }
            .fixed-cta .cta-text {
                font-size: 13px;
                text-align: center;
                flex: 1;
                min-width: 0;
            }
            .fixed-cta .btn {
                padding: 10px 16px;
                font-size: 13px;
                min-height: 36px;
            }
            .fixed-cta .cta-close {
                position: static;
                transform: none;
                margin-left: auto;
                flex-shrink: 0;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .hero-text h1 {
                font-size: 21px;
            }
            .hero-actions {
                flex-direction: column;
                width: 100%;
            }
            .hero-actions .btn {
                width: 100%;
            }
            .knowledge-grid {
                grid-template-columns: 1fr;
            }
            .category-grid-6 {
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
            }
            .data-bar {
                grid-template-columns: repeat(2, 1fr);
                gap: 10px;
            }
            .data-number {
                font-size: 22px;
            }
            .section-title {
                font-size: 22px;
            }
            .brand-intro {
                padding: 20px;
            }
            .culture-article {
                padding: 20px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
            .fixed-cta {
                flex-direction: column;
                align-items: stretch;
                gap: 8px;
            }
            .fixed-cta .btn {
                width: 100%;
                justify-content: center;
            }
            .fixed-cta .cta-close {
                position: absolute;
                right: 8px;
                top: 8px;
                transform: none;
                margin-left: 0;
            }
            .fixed-cta .cta-text {
                margin-right: 28px;
            }
        }

/* roulang page: category2 */
:root {
      --color-primary: #1D6FD1;
      --color-primary-hover: #155ABD;
      --color-accent: #E8952B;
      --color-bg: #F7F9FC;
      --color-surface: #FFFFFF;
      --color-text: #1A1F2E;
      --color-text-secondary: #5A6472;
      --color-border: #E1E8F0;
      --color-success: #2F9E5F;
      --radius-card: 14px;
      --radius-btn: 10px;
      --radius-pill: 999px;
      --shadow-card: 0 2px 14px rgba(26,31,46,0.06);
      --shadow-card-hover: 0 8px 28px rgba(26,31,46,0.12);
      --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      --container-max: 1200px;
      --section-padding: 72px 0;
      --section-padding-mobile: 44px 0;
    }
    html {
      scroll-behavior: smooth;
      -webkit-text-size-adjust: 100%;
    }
    body {
      font-family: var(--font-sans);
      font-size: 15.5px;
      line-height: 1.8;
      color: var(--color-text);
      background-color: var(--color-bg);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      margin: 0;
      padding-bottom: 72px;
    }
    a {
      color: var(--color-primary);
      text-decoration: none;
      transition: color 180ms ease;
    }
    a:hover {
      color: var(--color-primary-hover);
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
      border-radius: var(--radius-card);
    }
    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
      font-size: 15px;
    }
    input {
      font-family: inherit;
      font-size: 15px;
    }
    a:focus-visible,
    button:focus-visible,
    input:focus-visible {
      outline: 2px solid var(--color-primary);
      outline-offset: 2px;
    }
    .container {
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* Header & Navigation */
    .site-header {
      background: var(--color-surface);
      border-bottom: 1px solid var(--color-border);
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: 0 1px 8px rgba(26,31,46,0.04);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 64px;
      gap: 20px;
    }
    .logo {
      font-size: 20px;
      font-weight: 700;
      color: var(--color-primary);
      letter-spacing: 0.5px;
      white-space: nowrap;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .logo .logo-dot {
      display: inline-block;
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: var(--color-accent);
      margin-right: 4px;
    }
    .logo a {
      color: var(--color-primary);
      display: flex;
      align-items: center;
      gap: 4px;
    }
    .logo a:hover {
      color: var(--color-primary-hover);
    }
    .main-nav {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .nav-item {
      position: relative;
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 600;
      color: var(--color-text);
      border-radius: var(--radius-btn);
      transition: background 180ms ease, color 180ms ease;
      cursor: pointer;
      white-space: nowrap;
    }
    .nav-item a {
      color: inherit;
    }
    .nav-item:hover {
      background: #F0F5FC;
      color: var(--color-primary);
    }
    .nav-item.active {
      color: var(--color-primary);
      background: #EDF4FC;
    }
    .nav-item .arrow {
      font-size: 10px;
      margin-left: 3px;
      display: inline-block;
      transition: transform 180ms ease;
    }
    .dropdown-panel {
      display: none;
      position: absolute;
      top: 100%;
      left: 0;
      min-width: 240px;
      background: var(--color-surface);
      border-radius: 10px;
      box-shadow: var(--shadow-card-hover);
      padding: 16px;
      border: 1px solid var(--color-border);
      z-index: 99;
    }
    .dropdown-panel a {
      display: block;
      padding: 6px 10px;
      font-size: 13px;
      font-weight: 400;
      color: var(--color-text-secondary);
      border-radius: 6px;
      transition: background 150ms ease, color 150ms ease;
    }
    .dropdown-panel a:hover {
      background: #F0F5FC;
      color: var(--color-primary);
    }
    .dropdown-title {
      font-size: 12px;
      font-weight: 700;
      color: var(--color-accent);
      letter-spacing: 0.5px;
      margin-bottom: 12px;
    }
    .nav-item:hover .dropdown-panel,
    .nav-item:focus-within .dropdown-panel {
      display: block;
    }
    .nav-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      padding: 8px;
      border-radius: 8px;
      background: transparent;
      border: 1px solid var(--color-border);
      cursor: pointer;
    }
    .nav-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--color-text);
      border-radius: 2px;
      transition: all 200ms ease;
    }
    #nav-checkbox {
      display: none;
    }

    /* Section Base */
    .section {
      padding: var(--section-padding);
      position: relative;
    }
    .section-alt {
      background: var(--color-surface);
      border-top: 1px solid var(--color-border);
      border-bottom: 1px solid var(--color-border);
    }
    .section-label {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      color: var(--color-accent);
      letter-spacing: 1px;
      margin-bottom: 8px;
      text-transform: uppercase;
    }
    .section-title {
      font-size: 26px;
      line-height: 1.3;
      font-weight: 700;
      color: var(--color-text);
      margin: 0 0 12px;
    }
    .section-desc {
      font-size: 15.5px;
      color: var(--color-text-secondary);
      margin: 0 0 24px;
      max-width: 720px;
    }

    /* Category Banner */
    .category-banner {
      background: linear-gradient(180deg, #EFF6FF 0%, #F7F9FC 100%);
      padding: 48px 0;
      border-bottom: 1px solid var(--color-border);
    }
    .breadcrumb {
      font-size: 13px;
      color: var(--color-text-secondary);
      margin-bottom: 24px;
    }
    .breadcrumb a {
      color: var(--color-text-secondary);
      transition: color 180ms ease;
    }
    .breadcrumb a:hover {
      color: var(--color-primary);
    }
    .breadcrumb span {
      margin: 0 8px;
    }
    .category-banner-inner {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .category-banner h1 {
      font-size: 32px;
      line-height: 1.25;
      font-weight: 700;
      color: var(--color-text);
      margin: 0;
    }
    .category-banner .lead {
      font-size: 16px;
      color: var(--color-text-secondary);
      max-width: 480px;
      margin: 0;
    }

    /* Filter bar */
    .filter-bar {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 10px;
      margin: 24px 0 32px;
    }
    .filter-tag {
      display: inline-block;
      padding: 6px 16px;
      border-radius: var(--radius-pill);
      font-size: 14px;
      font-weight: 500;
      color: var(--color-text-secondary);
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      transition: all 180ms ease;
      cursor: pointer;
    }
    .filter-tag:hover,
    .filter-tag.active {
      background: #EDF4FC;
      color: var(--color-primary);
      border-color: var(--color-primary);
    }

    /* Article list */
    .article-list {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
    }
    .article-card {
      background: var(--color-surface);
      border-radius: var(--radius-card);
      border: 1px solid var(--color-border);
      box-shadow: var(--shadow-card);
      padding: 16px;
      display: flex;
      gap: 16px;
      transition: box-shadow 180ms ease, transform 180ms ease, border-color 180ms ease;
    }
    .article-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-3px);
      border-color: #C9D8EC;
    }
    .article-card-img {
      flex: 0 0 160px;
      width: 160px;
      height: 120px;
    }
    .article-card-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      border-radius: 10px;
    }
    .article-card-body {
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .article-card-title {
      font-size: 17px;
      font-weight: 700;
      line-height: 1.45;
      color: var(--color-text);
      margin: 0 0 8px;
    }
    .article-card-title a {
      color: inherit;
    }
    .article-card-title a:hover {
      color: var(--color-primary);
    }
    .article-card-excerpt {
      font-size: 14px;
      color: var(--color-text-secondary);
      line-height: 1.6;
      margin: 0 0 12px;
      flex-grow: 1;
    }
    .article-card-meta {
      display: flex;
      align-items: center;
      flex-wrap: wrap;
      gap: 8px;
      font-size: 12.5px;
      color: var(--color-text-secondary);
    }
    .article-card-meta .tag {
      background: #F0F5FC;
      color: var(--color-primary);
      padding: 2px 10px;
      border-radius: var(--radius-pill);
      font-size: 12px;
      font-weight: 600;
    }
    .article-card-meta .tag.accent {
      background: #FFF3E2;
      color: var(--color-accent);
    }

    /* Two column layout for hot & support */
    .two-col {
      display: grid;
      grid-template-columns: 1fr 320px;
      gap: 32px;
    }
    .main-col {
      min-width: 0;
    }
    .side-col {
      min-width: 0;
    }
    .hot-list {
      background: var(--color-surface);
      border-radius: var(--radius-card);
      border: 1px solid var(--color-border);
      box-shadow: var(--shadow-card);
      padding: 24px;
    }
    .hot-list h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--color-text);
      margin: 0 0 16px;
      padding-bottom: 12px;
      border-bottom: 1px solid var(--color-border);
    }
    .hot-item {
      display: block;
      padding: 10px 0;
      border-bottom: 1px solid #F0F2F5;
    }
    .hot-item:last-child {
      border-bottom: none;
    }
    .hot-item a {
      font-size: 14px;
      color: var(--color-text);
      font-weight: 500;
      line-height: 1.5;
    }
    .hot-item a:hover {
      color: var(--color-primary);
    }
    .hot-item .hot-date {
      font-size: 12px;
      color: var(--color-text-secondary);
      margin-top: 4px;
    }

    /* Tag cloud */
    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }
    .tag-cloud .tag {
      padding: 6px 14px;
      border-radius: var(--radius-pill);
      font-size: 13px;
      font-weight: 500;
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      color: var(--color-text-secondary);
      transition: all 180ms ease;
    }
    .tag-cloud .tag:hover {
      background: #EDF4FC;
      color: var(--color-primary);
      border-color: var(--color-primary);
    }

    /* Support section */
    .support-stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      margin-top: 24px;
    }
    .stat-item {
      background: var(--color-surface);
      border-radius: var(--radius-card);
      padding: 20px;
      text-align: center;
      border: 1px solid var(--color-border);
      box-shadow: var(--shadow-card);
    }
    .stat-item .stat-number {
      font-size: 28px;
      font-weight: 700;
      color: var(--color-primary);
      line-height: 1.3;
    }
    .stat-item .stat-label {
      font-size: 13px;
      color: var(--color-text-secondary);
      margin-top: 4px;
    }

    /* CTA */
    .cta-slim {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      padding: 28px 32px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }
    .cta-slim h3 {
      font-size: 20px;
      font-weight: 700;
      color: var(--color-text);
      margin: 0 0 8px;
    }
    .cta-slim p {
      font-size: 14px;
      color: var(--color-text-secondary);
      margin: 0;
    }
    .cta-slim .cta-form {
      display: flex;
      gap: 10px;
      align-items: center;
      flex-wrap: wrap;
    }
    .cta-slim input[type="text"] {
      width: 260px;
      padding: 10px 16px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-btn);
      background: var(--color-bg);
      font-size: 14px;
      color: var(--color-text);
    }
    .cta-slim input[type="text"]:focus {
      outline: 2px solid var(--color-primary);
      outline-offset: 2px;
    }

    /* Buttons */
    .btn {
      display: inline-block;
      padding: 10px 20px;
      border-radius: var(--radius-btn);
      font-weight: 600;
      font-size: 14px;
      text-align: center;
      transition: background 180ms ease, color 180ms ease, border 180ms ease;
      border: 1px solid transparent;
    }
    .btn-primary {
      background: var(--color-primary);
      color: #fff;
    }
    .btn-primary:hover {
      background: var(--color-primary-hover);
      color: #fff;
    }
    .btn-accent {
      background: var(--color-accent);
      color: #fff;
    }
    .btn-accent:hover {
      background: #D17F1F;
      color: #fff;
    }
    .btn-outline {
      background: transparent;
      border: 1px solid var(--color-primary);
      color: var(--color-primary);
    }
    .btn-outline:hover {
      background: #EDF4FC;
      border-color: var(--color-primary-hover);
      color: var(--color-primary-hover);
    }

    /* Related section */
    .related-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .related-card {
      background: var(--color-surface);
      border-radius: var(--radius-card);
      border: 1px solid var(--color-border);
      box-shadow: var(--shadow-card);
      padding: 20px;
      transition: box-shadow 180ms ease, transform 180ms ease;
      text-align: center;
    }
    .related-card:hover {
      box-shadow: var(--shadow-card-hover);
      transform: translateY(-3px);
    }
    .related-card h4 {
      font-size: 16px;
      font-weight: 700;
      color: var(--color-text);
      margin: 0 0 8px;
    }
    .related-card p {
      font-size: 13px;
      color: var(--color-text-secondary);
      margin: 0;
    }

    /* Footer */
    .site-footer {
      background: #1A1F2E;
      color: #C7D2E3;
      padding: 48px 0 28px;
      margin-top: 72px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 32px;
      margin-bottom: 32px;
    }
    .footer-brand h3 {
      font-size: 20px;
      font-weight: 700;
      color: #fff;
      margin: 0 0 12px;
    }
    .footer-brand p {
      font-size: 14px;
      line-height: 1.7;
      color: #8E99AD;
      margin: 0;
    }
    .footer-links h4 {
      font-size: 15px;
      font-weight: 600;
      color: #fff;
      margin: 0 0 12px;
    }
    .footer-links a {
      display: block;
      font-size: 14px;
      color: #C7D2E3;
      padding: 4px 0;
      transition: color 180ms ease;
    }
    .footer-links a:hover {
      color: #fff;
    }
    .footer-bottom {
      border-top: 1px solid #2E3442;
      padding-top: 20px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 12px;
      color: #8E99AD;
    }
    .footer-bottom a {
      color: #C7D2E3;
      margin: 0 4px;
    }
    .footer-bottom a:hover {
      color: #fff;
    }
    .beian {
      font-family: monospace;
      letter-spacing: 0.5px;
    }

    /* Responsive */
    @media screen and (max-width: 1024px) {
      .nav-toggle {
        display: flex;
      }
      .main-nav {
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-surface);
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 16px 24px;
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow-card-hover);
        display: none;
      }
      #nav-checkbox:checked ~ .main-nav {
        display: flex;
      }
      .nav-item {
        width: 100%;
        padding: 10px 8px;
      }
      .dropdown-panel {
        position: static;
        box-shadow: none;
        border: none;
        padding: 8px 0 8px 16px;
        display: none;
      }
      .nav-item:hover .dropdown-panel,
      .nav-item:focus-within .dropdown-panel {
        display: block;
      }
      .header-inner {
        flex-wrap: wrap;
      }
      .two-col {
        grid-template-columns: 1fr;
      }
    }
    @media screen and (max-width: 768px) {
      :root {
        --section-padding: var(--section-padding-mobile);
      }
      .article-list {
        grid-template-columns: 1fr;
      }
      .article-card {
        flex-direction: column;
      }
      .article-card-img {
        flex: 0 0 auto;
        width: 100%;
        height: 180px;
      }
      .support-stats {
        grid-template-columns: 1fr 1fr;
      }
      .related-grid {
        grid-template-columns: 1fr 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }
    }
    @media screen and (max-width: 520px) {
      .container {
        padding: 0 16px;
      }
      .category-banner h1 {
        font-size: 26px;
      }
      .cta-slim {
        flex-direction: column;
        align-items: stretch;
      }
      .cta-slim .cta-form {
        flex-direction: column;
        align-items: stretch;
      }
      .cta-slim input[type="text"] {
        width: 100%;
      }
      .related-grid {
        grid-template-columns: 1fr;
      }
      .support-stats {
        grid-template-columns: 1fr;
      }
    }

/* roulang page: category1 */
:root {
            --color-primary: #1D6FD1;
            --color-primary-hover: #155ABD;
            --color-accent: #E8952B;
            --color-bg: #F7F9FC;
            --color-surface: #FFFFFF;
            --color-text: #1A1F2E;
            --color-text-secondary: #5A6472;
            --color-border: #E1E8F0;
            --color-success: #2F9E5F;
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-pill: 999px;
            --shadow-card: 0 2px 14px rgba(26,31,46,0.06);
            --shadow-card-hover: 0 8px 28px rgba(26,31,46,0.12);
            --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            --container-max: 1200px;
            --section-padding: 72px 0;
            --section-padding-mobile: 44px 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 15.5px;
            line-height: 1.8;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            margin: 0;
            padding: 0;
        }
        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color 180ms ease;
        }
        a:hover {
            color: var(--color-primary-hover);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            font-size: 15px;
        }
        input {
            font-family: inherit;
            font-size: 15px;
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* Header & Navigation */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 8px rgba(26,31,46,0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 64px;
            gap: 20px;
        }
        .logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .logo .logo-dot {
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--color-accent);
            margin-right: 4px;
        }
        .logo a {
            color: var(--color-primary);
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .logo a:hover {
            color: var(--color-primary-hover);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: nowrap;
        }
        .nav-item {
            position: relative;
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text);
            border-radius: var(--radius-btn);
            transition: background 180ms ease, color 180ms ease;
            cursor: default;
            white-space: nowrap;
        }
        .nav-item a {
            color: inherit;
            display: inline-flex;
            align-items: center;
            gap: 3px;
        }
        .nav-item:hover {
            background: #F0F5FC;
            color: var(--color-primary);
        }
        .nav-item.active {
            color: var(--color-primary);
            background: #EDF4FC;
        }
        .nav-item .arrow {
            font-size: 10px;
            margin-left: 3px;
            display: inline-block;
            transition: transform 180ms ease;
        }
        .nav-item:hover .arrow {
            transform: rotate(180deg);
        }
        .nav-dropdown {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            min-width: 260px;
            background: var(--color-surface);
            border-radius: 10px;
            box-shadow: 0 10px 30px rgba(26,31,46,0.15);
            padding: 16px;
            z-index: 110;
            border: 1px solid var(--color-border);
        }
        .nav-item:hover .nav-dropdown {
            display: block;
        }
        .nav-dropdown .dropdown-label {
            display: inline-block;
            font-size: 11px;
            font-weight: 700;
            color: var(--color-accent);
            background: #FEF5E8;
            padding: 2px 10px;
            border-radius: var(--radius-pill);
            margin-bottom: 10px;
            letter-spacing: 0.5px;
        }
        .nav-dropdown a.dropdown-link {
            display: block;
            padding: 6px 10px;
            font-size: 13px;
            font-weight: 400;
            color: var(--color-text-secondary);
            border-radius: 6px;
            transition: background 150ms ease, color 150ms ease;
        }
        .nav-dropdown a.dropdown-link:hover {
            background: #F0F5FC;
            color: var(--color-primary);
        }
        .nav-dropdown .divider {
            height: 1px;
            background: var(--color-border);
            margin: 8px 0;
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            background: transparent;
            border: 1px solid var(--color-border);
            cursor: pointer;
        }
        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--color-text);
            border-radius: 2px;
            transition: all 200ms ease;
        }
        #nav-checkbox {
            display: none;
        }

        /* Breadcrumb */
        .breadcrumb {
            padding: 16px 0;
            font-size: 13px;
            color: var(--color-text-secondary);
            background: transparent;
        }
        .breadcrumb a {
            color: var(--color-primary);
            font-weight: 500;
        }
        .breadcrumb a:hover {
            color: var(--color-primary-hover);
        }
        .breadcrumb .separator {
            margin: 0 8px;
            color: var(--color-border);
        }

        /* Section Base */
        .section {
            padding: var(--section-padding);
            position: relative;
        }
        .section-alt {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }
        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: 1px;
            margin-bottom: 8px;
        }
        .section-title {
            font-size: 26px;
            line-height: 1.3;
            font-weight: 700;
            color: var(--color-text);
            margin: 0 0 12px 0;
        }
        .section-desc {
            font-size: 15.5px;
            color: var(--color-text-secondary);
            line-height: 1.8;
            margin: 0 0 28px 0;
            max-width: 780px;
        }

        /* Category Hero */
        .category-hero {
            background: linear-gradient(135deg, #EFF6FF 0%, #F7F9FC 100%);
            border-bottom: 1px solid var(--color-border);
            padding: 40px 0;
        }
        .category-hero-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 20px;
        }
        .category-hero h1 {
            font-size: 34px;
            font-weight: 700;
            color: var(--color-text);
            margin: 0;
            line-height: 1.25;
        }
        .category-hero .hero-guide {
            font-size: 15px;
            color: var(--color-text-secondary);
            max-width: 460px;
            margin: 0;
            line-height: 1.7;
        }

        /* Filter Bar */
        .filter-bar {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin: 20px 0 28px;
        }
        .filter-tag {
            padding: 8px 18px;
            border-radius: var(--radius-pill);
            font-size: 13px;
            font-weight: 600;
            color: var(--color-text-secondary);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            transition: all 180ms ease;
        }
        .filter-tag:hover {
            background: #F0F5FC;
            color: var(--color-primary);
            border-color: var(--color-primary);
        }
        .filter-tag.active {
            background: var(--color-primary);
            color: #fff;
            border-color: var(--color-primary);
        }

        /* Article List */
        .article-list {
            display: flex;
            flex-direction: column;
            gap: 18px;
        }
        .article-card {
            display: flex;
            gap: 18px;
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 16px;
            box-shadow: var(--shadow-card);
            transition: box-shadow 180ms ease, border-color 180ms ease, transform 180ms ease;
            align-items: flex-start;
        }
        .article-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: #D0DDEB;
            transform: translateY(-2px);
        }
        .article-card .card-image {
            flex: 0 0 160px;
            width: 160px;
            height: 120px;
            border-radius: 10px;
            overflow: hidden;
            background: #E8EDF5;
        }
        .article-card .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 10px;
        }
        .article-card .card-body {
            flex: 1;
            min-width: 0;
        }
        .article-card .card-tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            color: var(--color-primary);
            background: #EDF4FC;
            padding: 2px 10px;
            border-radius: var(--radius-pill);
            margin-bottom: 8px;
        }
        .article-card .card-title {
            font-size: 17px;
            font-weight: 600;
            color: var(--color-text);
            margin: 0 0 6px 0;
            line-height: 1.45;
        }
        .article-card .card-title a {
            color: inherit;
        }
        .article-card .card-title a:hover {
            color: var(--color-primary);
        }
        .article-card .card-summary {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.7;
            margin: 0 0 8px 0;
        }
        .article-card .card-meta {
            font-size: 12px;
            color: #9AA6B5;
        }

        /* Sidebar / Popular */
        .popular-section {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 24px;
        }
        .popular-section h2 {
            font-size: 19px;
            font-weight: 600;
            color: var(--color-text);
            margin: 0 0 16px 0;
            padding-bottom: 12px;
            border-bottom: 1px solid var(--color-border);
        }
        .popular-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .popular-item {
            display: flex;
            align-items: baseline;
            gap: 10px;
            font-size: 14px;
            border-bottom: 1px solid #F0F3F8;
            padding-bottom: 10px;
        }
        .popular-item:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }
        .popular-item .rank {
            font-size: 13px;
            font-weight: 700;
            color: var(--color-accent);
            min-width: 24px;
        }
        .popular-item a {
            color: var(--color-text);
            font-weight: 500;
        }
        .popular-item a:hover {
            color: var(--color-primary);
        }

        /* Topic Cloud */
        .topic-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 16px;
        }
        .topic-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 18px;
            box-shadow: var(--shadow-card);
            transition: all 180ms ease;
        }
        .topic-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
            border-color: #D0DDEB;
        }
        .topic-card h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-text);
            margin: 0 0 7px 0;
        }
        .topic-card p {
            font-size: 13px;
            color: var(--color-text-secondary);
            margin: 0;
            line-height: 1.6;
        }

        /* Support Block */
        .support-block {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 28px;
        }
        .support-block h2 {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-text);
            margin: 0 0 14px 0;
        }
        .support-block p {
            font-size: 15px;
            color: var(--color-text-secondary);
            line-height: 1.85;
            margin: 0 0 14px 0;
        }

        /* View More */
        .view-more {
            text-align: center;
            padding: 18px 0;
        }
        .btn-outline-primary {
            display: inline-block;
            padding: 10px 24px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-primary);
            background: transparent;
            border: 1px solid var(--color-primary);
            border-radius: var(--radius-btn);
            transition: all 180ms ease;
        }
        .btn-outline-primary:hover {
            background: #EDF4FC;
            color: var(--color-primary-hover);
        }

        /* Subscribe CTA */
        .subscribe-cta {
            background: linear-gradient(135deg, #EFF6FF 0%, #F4F8FE 100%);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 28px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }
        .subscribe-cta .cta-text {
            flex: 1;
            min-width: 240px;
        }
        .subscribe-cta h2 {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-text);
            margin: 0 0 6px 0;
        }
        .subscribe-cta p {
            font-size: 14px;
            color: var(--color-text-secondary);
            margin: 0;
        }
        .btn-accent {
            display: inline-block;
            padding: 11px 26px;
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            background: var(--color-accent);
            border-radius: var(--radius-btn);
            transition: background 180ms ease;
            white-space: nowrap;
        }
        .btn-accent:hover {
            background: #d37f1d;
            color: #fff;
        }

        /* Related Entries */
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }
        .related-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 18px;
            box-shadow: var(--shadow-card);
            transition: all 180ms ease;
            display: block;
        }
        .related-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
            border-color: #D0DDEB;
        }
        .related-card h3 {
            font-size: 15px;
            font-weight: 600;
            color: var(--color-text);
            margin: 0 0 5px 0;
        }
        .related-card p {
            font-size: 13px;
            color: var(--color-text-secondary);
            margin: 0;
            line-height: 1.6;
        }

        /* Footer */
        .site-footer {
            background: #1A1F2E;
            color: #B8C4D4;
            padding: 48px 0 24px;
            margin-top: 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 28px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand h3 {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
            margin: 0 0 10px 0;
        }
        .footer-brand p {
            font-size: 13px;
            line-height: 1.7;
            color: #9AA6B5;
            margin: 0;
            max-width: 340px;
        }
        .footer-links h4 {
            font-size: 14px;
            font-weight: 600;
            color: #fff;
            margin: 0 0 12px 0;
        }
        .footer-links a {
            display: block;
            font-size: 13px;
            color: #C7D2E3;
            margin-bottom: 8px;
            transition: color 150ms ease;
        }
        .footer-links a:hover {
            color: #fff;
        }
        .footer-bottom {
            padding-top: 20px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px;
            font-size: 12px;
            color: #8A95A7;
        }
        .footer-bottom .beian {
            font-family: "SF Mono", "Menlo", "Consolas", monospace;
            font-size: 12px;
        }
        .footer-bottom a {
            color: #C7D2E3;
            font-size: 12px;
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .main-nav {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: var(--color-surface);
                flex-direction: column;
                align-items: stretch;
                padding: 12px 24px 20px;
                border-bottom: 1px solid var(--color-border);
                box-shadow: 0 8px 20px rgba(26,31,46,0.08);
                gap: 4px;
            }
            #nav-checkbox:checked ~ .main-nav {
                display: flex;
            }
            .nav-toggle {
                display: flex;
            }
            .nav-item {
                padding: 10px 8px;
                border-radius: 8px;
            }
            .nav-dropdown {
                display: none !important;
                position: static;
                box-shadow: none;
                border: none;
                padding: 6px 0 6px 16px;
                background: transparent;
            }
            .nav-item:hover .nav-dropdown {
                display: none !important;
            }
            .nav-item:focus-within .nav-dropdown {
                display: block !important;
            }
            .topic-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
        }
        @media (max-width: 768px) {
            :root {
                --section-padding: 44px 0;
            }
            .category-hero {
                padding: 28px 0;
            }
            .category-hero h1 {
                font-size: 26px;
            }
            .category-hero-inner {
                flex-direction: column;
                align-items: flex-start;
            }
            .filter-bar {
                flex-wrap: nowrap;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
                padding-bottom: 8px;
                gap: 8px;
            }
            .filter-tag {
                flex-shrink: 0;
                white-space: nowrap;
            }
            .article-card {
                flex-direction: column;
                gap: 12px;
            }
            .article-card .card-image {
                flex: 0 0 auto;
                width: 100%;
                height: 180px;
            }
            .topic-grid {
                grid-template-columns: 1fr;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .subscribe-cta {
                flex-direction: column;
                align-items: flex-start;
            }
            .btn-accent {
                width: 100%;
                text-align: center;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .section-title {
                font-size: 21px;
            }
            .article-card .card-title {
                font-size: 15px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 6px;
            }
        }

/* roulang page: category3 */
:root {
            --color-primary: #1D6FD1;
            --color-primary-hover: #155ABD;
            --color-accent: #E8952B;
            --color-bg: #F7F9FC;
            --color-surface: #FFFFFF;
            --color-text: #1A1F2E;
            --color-text-secondary: #5A6472;
            --color-border: #E1E8F0;
            --color-success: #2F9E5F;
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-pill: 999px;
            --shadow-card: 0 2px 14px rgba(26,31,46,0.06);
            --shadow-card-hover: 0 8px 28px rgba(26,31,46,0.12);
            --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            --container-max: 1200px;
            --section-padding: 72px 0;
            --section-padding-mobile: 44px 0;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 15.5px;
            line-height: 1.8;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color 180ms ease;
        }

        a:hover {
            color: var(--color-primary-hover);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-card);
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            font-size: 15px;
        }

        input {
            font-family: inherit;
            font-size: 15px;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 8px rgba(26,31,46,0.04);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 64px;
            gap: 20px;
        }

        .logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .logo .logo-dot {
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--color-accent);
            margin-right: 4px;
        }

        .logo a {
            color: var(--color-primary);
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .logo a:hover {
            color: var(--color-primary-hover);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .nav-item {
            position: relative;
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text);
            border-radius: var(--radius-btn);
            transition: background 180ms ease, color 180ms ease;
            cursor: pointer;
            white-space: nowrap;
        }

        .nav-item a {
            color: inherit;
        }

        .nav-item:hover {
            background: #F0F5FC;
            color: var(--color-primary);
        }

        .nav-item.active {
            color: var(--color-primary);
            background: #EDF4FC;
        }

        .nav-item .arrow {
            font-size: 10px;
            margin-left: 3px;
            display: inline-block;
            transition: transform 180ms ease;
        }

        .nav-item.has-dropdown:hover .arrow {
            transform: rotate(180deg);
        }

        .dropdown-panel {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            min-width: 260px;
            background: var(--color-surface);
            border-radius: 10px;
            box-shadow: var(--shadow-card-hover);
            border: 1px solid var(--color-border);
            padding: 16px;
            z-index: 200;
            margin-top: 8px;
        }

        .nav-item.has-dropdown:hover .dropdown-panel {
            display: block;
        }

        .dropdown-panel a {
            display: block;
            padding: 6px 10px;
            font-size: 13px;
            font-weight: 400;
            color: var(--color-text-secondary);
            border-radius: 6px;
            transition: background 150ms ease, color 150ms ease;
            white-space: normal;
            line-height: 1.5;
        }

        .dropdown-panel a:hover {
            background: #F0F5FC;
            color: var(--color-primary);
        }

        .dropdown-label {
            font-size: 11px;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-bottom: 8px;
            padding: 0 10px;
        }

        .dropdown-label:not(:first-child) {
            margin-top: 14px;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            background: transparent;
            border: 1px solid var(--color-border);
            cursor: pointer;
        }

        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--color-text);
            border-radius: 2px;
            transition: all 200ms ease;
        }

        #nav-checkbox {
            display: none;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-section {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: 14px 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--color-text-secondary);
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--color-text-secondary);
            transition: color 180ms ease;
        }

        .breadcrumb a:hover {
            color: var(--color-primary);
        }

        .breadcrumb .separator {
            color: var(--color-border);
            font-size: 12px;
        }

        .breadcrumb .current {
            color: var(--color-primary);
            font-weight: 600;
        }

        /* ===== Category H1 Banner ===== */
        .category-banner {
            background: linear-gradient(180deg, #EFF6FF 0%, var(--color-surface) 100%);
            border-bottom: 1px solid var(--color-border);
            padding: 40px 0;
        }

        .category-banner-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 32px;
            flex-wrap: wrap;
        }

        .category-banner h1 {
            font-size: 32px;
            line-height: 1.25;
            font-weight: 700;
            color: var(--color-text);
            letter-spacing: 0.5px;
        }

        .category-banner .banner-desc {
            font-size: 15px;
            color: var(--color-text-secondary);
            line-height: 1.7;
            max-width: 460px;
            text-align: right;
        }

        /* ===== Filter Bar ===== */
        .filter-bar {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: 16px 0;
        }

        .filter-tabs {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            align-items: center;
        }

        .filter-tab {
            display: inline-block;
            padding: 8px 18px;
            font-size: 13px;
            font-weight: 600;
            color: var(--color-text-secondary);
            background: var(--color-bg);
            border-radius: var(--radius-pill);
            border: 1px solid var(--color-border);
            transition: all 180ms ease;
            cursor: pointer;
            white-space: nowrap;
        }

        .filter-tab:hover {
            background: #F0F5FC;
            color: var(--color-primary);
            border-color: var(--color-primary);
        }

        .filter-tab.active {
            background: var(--color-primary);
            color: #fff;
            border-color: var(--color-primary);
        }

        /* ===== Article List ===== */
        .article-list-section {
            padding: var(--section-padding);
        }

        .article-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }

        .article-card {
            display: flex;
            gap: 20px;
            background: var(--color-surface);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--color-border);
            padding: 16px;
            transition: box-shadow 180ms ease, transform 180ms ease, border-color 180ms ease;
        }

        .article-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: #D0DDEB;
        }

        .article-card .card-img {
            flex-shrink: 0;
            width: 160px;
            height: 120px;
            border-radius: 10px;
            overflow: hidden;
        }

        .article-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 10px;
            transition: transform 250ms ease;
        }

        .article-card:hover .card-img img {
            transform: scale(1.03);
        }

        .article-card .card-body {
            flex: 1;
            min-width: 0;
        }

        .article-card .card-body h3 {
            font-size: 17px;
            line-height: 1.45;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 6px;
        }

        .article-card .card-body h3 a {
            color: inherit;
            transition: color 180ms ease;
        }

        .article-card .card-body h3 a:hover {
            color: var(--color-primary);
        }

        .article-card .card-summary {
            font-size: 13.5px;
            color: var(--color-text-secondary);
            line-height: 1.7;
            margin-bottom: 10px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .article-card .card-meta {
            display: flex;
            align-items: center;
            gap: 14px;
            font-size: 12px;
            color: var(--color-text-secondary);
            flex-wrap: wrap;
        }

        .article-card .card-tag {
            display: inline-block;
            padding: 2px 10px;
            font-size: 11px;
            font-weight: 600;
            color: var(--color-primary);
            background: #EDF4FC;
            border-radius: var(--radius-pill);
        }

        .article-card .card-date {
            font-size: 12px;
            color: var(--color-text-secondary);
        }

        /* ===== Sidebar Popular ===== */
        .popular-section {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
            padding: 32px 0;
        }

        .popular-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 16px;
        }

        .popular-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 10px 12px;
            background: var(--color-bg);
            border-radius: var(--radius-btn);
            border: 1px solid var(--color-border);
            transition: all 180ms ease;
        }

        .popular-item:hover {
            background: #F0F5FC;
            border-color: var(--color-primary);
        }

        .popular-item .popular-rank {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-accent);
            flex-shrink: 0;
            width: 36px;
            text-align: center;
        }

        .popular-item .popular-info {
            flex: 1;
            min-width: 0;
        }

        .popular-item .popular-info a {
            font-size: 13.5px;
            font-weight: 600;
            color: var(--color-text);
            display: block;
            line-height: 1.5;
            transition: color 180ms ease;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }

        .popular-item .popular-info a:hover {
            color: var(--color-primary);
        }

        .popular-item .popular-info span {
            font-size: 11px;
            color: var(--color-text-secondary);
        }

        /* ===== Tag Cloud ===== */
        .tag-cloud-section {
            padding: var(--section-padding);
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
        }

        .tag-card {
            display: inline-block;
            padding: 10px 20px;
            font-size: 14px;
            font-weight: 500;
            color: var(--color-text);
            background: var(--color-surface);
            border-radius: var(--radius-btn);
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
            transition: all 180ms ease;
            cursor: pointer;
        }

        .tag-card:hover {
            box-shadow: var(--shadow-card-hover);
            border-color: var(--color-primary);
            color: var(--color-primary);
            transform: translateY(-2px);
        }

        /* ===== Support Block ===== */
        .support-section {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
            padding: var(--section-padding);
        }

        .support-inner {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: center;
        }

        .support-text h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 16px;
            line-height: 1.3;
        }

        .support-text p {
            font-size: 15px;
            color: var(--color-text-secondary);
            line-height: 1.75;
            margin-bottom: 12px;
        }

        .support-stats {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
        }

        .stat-card {
            padding: 20px;
            background: var(--color-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--color-border);
            text-align: center;
        }

        .stat-number {
            font-size: 32px;
            font-weight: 700;
            color: var(--color-primary);
            line-height: 1.2;
            font-family: "Georgia", "Times New Roman", serif;
        }

        .stat-label {
            font-size: 13px;
            color: var(--color-text-secondary);
            margin-top: 6px;
        }

        /* ===== Load More Button ===== */
        .load-more-section {
            padding: 24px 0 48px;
            text-align: center;
        }

        .btn-outline {
            display: inline-block;
            padding: 12px 32px;
            font-size: 15px;
            font-weight: 600;
            color: var(--color-primary);
            background: transparent;
            border: 1px solid var(--color-primary);
            border-radius: var(--radius-btn);
            transition: all 180ms ease;
            cursor: pointer;
        }

        .btn-outline:hover {
            background: #EDF4FC;
            border-color: var(--color-primary-hover);
            color: var(--color-primary-hover);
        }

        /* ===== Subscribe CTA ===== */
        .cta-simple-section {
            padding: 24px 0 56px;
        }

        .cta-simple {
            background: var(--color-surface);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--color-border);
            padding: 28px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
        }

        .cta-simple-text {
            flex: 1;
            min-width: 200px;
        }

        .cta-simple-text h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 6px;
        }

        .cta-simple-text p {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.7;
        }

        .btn-accent {
            display: inline-block;
            padding: 12px 28px;
            font-size: 15px;
            font-weight: 600;
            color: #fff;
            background: var(--color-accent);
            border-radius: var(--radius-btn);
            transition: all 180ms ease;
            cursor: pointer;
            white-space: nowrap;
        }

        .btn-accent:hover {
            background: #D9801F;
            color: #fff;
            box-shadow: 0 4px 12px rgba(232,149,43,0.35);
        }

        /* ===== Related Categories ===== */
        .related-cats-section {
            padding: 0 0 var(--section-padding);
        }

        .related-cats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
            gap: 16px;
        }

        .related-cat-card {
            display: block;
            padding: 20px;
            background: var(--color-surface);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--color-border);
            transition: all 180ms ease;
        }

        .related-cat-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: #D0DDEB;
        }

        .related-cat-card h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 6px;
        }

        .related-cat-card:hover h4 {
            color: var(--color-primary);
        }

        .related-cat-card p {
            font-size: 13px;
            color: var(--color-text-secondary);
            line-height: 1.65;
        }

        .related-cat-card .cat-arrow {
            display: inline-block;
            margin-top: 10px;
            font-size: 13px;
            font-weight: 600;
            color: var(--color-primary);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #1A1F2E;
            color: #C7D2E3;
            padding: 48px 0 0;
            margin-top: auto;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }

        .footer-brand h3 {
            color: #FFFFFF;
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 13px;
            line-height: 1.7;
            color: #9AA7BD;
        }

        .footer-links h4 {
            color: #FFFFFF;
            font-size: 14px;
            font-weight: 700;
            margin-bottom: 14px;
            letter-spacing: 0.5px;
        }

        .footer-links a {
            display: block;
            font-size: 13px;
            color: #9AA7BD;
            margin-bottom: 8px;
            transition: color 180ms ease;
        }

        .footer-links a:hover {
            color: #FFFFFF;
        }

        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 18px;
            padding: 18px 0 24px;
            font-size: 12px;
            color: #8A96A8;
        }

        .footer-bottom .beian {
            font-family: "SFMono-Regular", "Consolas", "Liberation Mono", monospace;
            font-size: 11.5px;
        }

        .footer-bottom a {
            color: #C7D2E3;
            transition: color 180ms ease;
        }

        .footer-bottom a:hover {
            color: #FFFFFF;
        }

        /* ===== Section Headings ===== */
        .section-heading {
            margin-bottom: 24px;
        }

        .section-heading h2 {
            font-size: 26px;
            line-height: 1.3;
            font-weight: 700;
            color: var(--color-text);
            letter-spacing: 0.3px;
        }

        .section-heading .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: 1px;
            margin-bottom: 8px;
            text-transform: uppercase;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .main-nav {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: var(--color-surface);
                flex-direction: column;
                padding: 16px 24px;
                box-shadow: 0 12px 28px rgba(26,31,46,0.12);
                border-bottom: 2px solid var(--color-border);
                max-height: calc(100vh - 64px);
                overflow-y: auto;
                gap: 4px;
                align-items: stretch;
            }

            #nav-checkbox:checked ~ .main-nav {
                display: flex;
            }

            .nav-toggle {
                display: flex;
            }

            .nav-item {
                padding: 10px 12px;
                font-size: 15px;
            }

            .dropdown-panel {
                position: static;
                display: none;
                box-shadow: none;
                border: none;
                padding: 8px 0 8px 16px;
                margin-top: 0;
            }

            .nav-item.has-dropdown:hover .dropdown-panel {
                display: none;
            }

            .nav-item.has-dropdown:focus-within .dropdown-panel {
                display: block;
            }

            .support-inner {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .category-banner-inner {
                flex-direction: column;
                align-items: flex-start;
            }

            .category-banner .banner-desc {
                text-align: left;
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-padding: 44px 0;
            }

            .article-card {
                flex-direction: column;
                gap: 12px;
            }

            .article-card .card-img {
                width: 100%;
                height: 180px;
            }

            .support-stats {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .cta-simple {
                flex-direction: column;
                align-items: flex-start;
                gap: 16px;
                padding: 20px;
            }

            .btn-accent {
                width: 100%;
                text-align: center;
            }

            .related-cats-grid {
                grid-template-columns: 1fr;
            }
        }

        @media (max-width: 520px) {
            .filter-tabs {
                gap: 6px;
            }

            .filter-tab {
                padding: 6px 14px;
                font-size: 12px;
            }

            .category-banner h1 {
                font-size: 27px;
            }

            .breadcrumb {
                font-size: 12px;
            }

            .stat-number {
                font-size: 26px;
            }
        }

/* roulang page: category4 */
:root {
            --color-primary: #1D6FD1;
            --color-primary-hover: #155ABD;
            --color-accent: #E8952B;
            --color-bg: #F7F9FC;
            --color-surface: #FFFFFF;
            --color-text: #1A1F2E;
            --color-text-secondary: #5A6472;
            --color-border: #E1E8F0;
            --color-success: #2F9E5F;
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-pill: 999px;
            --shadow-card: 0 2px 14px rgba(26,31,46,0.06);
            --shadow-card-hover: 0 8px 28px rgba(26,31,46,0.12);
            --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            --container-max: 1200px;
            --section-padding: 72px 0;
            --section-padding-mobile: 44px 0;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 15.5px;
            line-height: 1.8;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color 180ms ease;
        }
        a:hover {
            color: var(--color-primary-hover);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-card);
        }
        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            font-size: 15px;
        }
        input {
            font-family: inherit;
            font-size: 15px;
        }
        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 8px rgba(26,31,46,0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 64px;
            gap: 20px;
        }
        .logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .logo .logo-dot {
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--color-accent);
            margin-right: 4px;
        }
        .logo a {
            color: var(--color-primary);
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .logo a:hover {
            color: var(--color-primary-hover);
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-item {
            position: relative;
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text);
            border-radius: var(--radius-btn);
            transition: background 180ms ease, color 180ms ease;
            cursor: pointer;
            white-space: nowrap;
        }
        .nav-item a {
            color: inherit;
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-item:hover {
            background: #F0F5FC;
            color: var(--color-primary);
        }
        .nav-item.active {
            color: var(--color-primary);
            background: #EDF4FC;
        }
        .nav-item .arrow {
            font-size: 10px;
            margin-left: 3px;
            display: inline-block;
            transition: transform 180ms ease;
        }
        .dropdown-panel {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            min-width: 240px;
            background: var(--color-surface);
            border-radius: 10px;
            box-shadow: 0 8px 28px rgba(26,31,46,0.12);
            border: 1px solid var(--color-border);
            padding: 16px;
            z-index: 200;
        }
        .nav-item:hover .dropdown-panel,
        .nav-item:focus-within .dropdown-panel {
            display: block;
        }
        .nav-item:hover .arrow {
            transform: rotate(180deg);
        }
        .dropdown-label {
            display: block;
            font-size: 13px;
            font-weight: 700;
            color: var(--color-accent);
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }
        .dropdown-link {
            display: block;
            padding: 6px 10px;
            font-size: 13px;
            font-weight: 400;
            color: var(--color-text-secondary);
            border-radius: 6px;
            transition: background 150ms ease, color 150ms ease;
            white-space: nowrap;
        }
        .dropdown-link:hover {
            background: #F0F5FC;
            color: var(--color-primary);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            background: transparent;
            border: 1px solid var(--color-border);
            cursor: pointer;
        }
        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--color-text);
            border-radius: 2px;
            transition: all 200ms ease;
        }
        #nav-checkbox {
            display: none;
        }

        /* ===== Section Base ===== */
        .section {
            padding: var(--section-padding);
            position: relative;
        }
        .section-alt {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }
        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: 1px;
            margin-bottom: 8px;
        }
        .section-title {
            font-size: 26px;
            line-height: 1.3;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 16px;
        }
        .section-desc {
            font-size: 15.5px;
            line-height: 1.8;
            color: var(--color-text-secondary);
            margin-bottom: 24px;
            max-width: 680px;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            font-size: 13px;
            color: var(--color-text-secondary);
            padding: 16px 0;
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--color-text-secondary);
        }
        .breadcrumb a:hover {
            color: var(--color-primary);
        }
        .breadcrumb .separator {
            color: #C0C9D6;
        }
        .breadcrumb .current {
            color: var(--color-text);
            font-weight: 600;
        }

        /* ===== Category Banner ===== */
        .category-banner {
            background: linear-gradient(135deg, #EFF6FF 0%, #F7F9FC 100%);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 28px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
            margin-bottom: 28px;
        }
        .category-banner h1 {
            font-size: 34px;
            line-height: 1.25;
            font-weight: 700;
            color: var(--color-text);
            margin: 0;
        }
        .category-banner .banner-desc {
            font-size: 15.5px;
            line-height: 1.7;
            color: var(--color-text-secondary);
            max-width: 480px;
            text-align: right;
        }

        /* ===== Filter Bar ===== */
        .filter-bar {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
            padding: 12px 0 20px;
            border-bottom: 1px solid var(--color-border);
            margin-bottom: 24px;
        }
        .filter-label {
            font-size: 13px;
            font-weight: 700;
            color: var(--color-text-secondary);
            margin-right: 4px;
        }
        .filter-btn {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: var(--radius-pill);
            font-size: 13px;
            font-weight: 600;
            color: var(--color-text-secondary);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            transition: all 180ms ease;
            white-space: nowrap;
        }
        .filter-btn:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            background: #F0F5FC;
        }
        .filter-btn.active {
            background: var(--color-primary);
            color: #fff;
            border-color: var(--color-primary);
        }

        /* ===== Main Content Layout ===== */
        .content-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 28px;
            align-items: start;
        }
        .article-list {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .article-card {
            display: flex;
            gap: 16px;
            background: var(--color-surface);
            border-radius: var(--radius-card);
            padding: 16px;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
            transition: box-shadow 180ms ease, transform 180ms ease, border-color 180ms ease;
        }
        .article-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: #CDD9E6;
        }
        .article-card .cover-img {
            flex-shrink: 0;
            width: 160px;
            height: 120px;
            object-fit: cover;
            border-radius: 10px;
            background-color: #E9EEF5;
        }
        .article-card .card-body {
            flex: 1;
            min-width: 0;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
            gap: 6px;
        }
        .article-card .tag {
            display: inline-block;
            font-size: 12px;
            font-weight: 700;
            color: var(--color-accent);
            background: #FDF3E5;
            border-radius: var(--radius-pill);
            padding: 2px 12px;
            align-self: flex-start;
            letter-spacing: 0.3px;
        }
        .article-card .card-title {
            font-size: 17px;
            line-height: 1.45;
            font-weight: 700;
            color: var(--color-text);
            transition: color 180ms ease;
        }
        .article-card .card-title a {
            color: inherit;
        }
        .article-card .card-title a:hover {
            color: var(--color-primary);
        }
        .article-card .card-summary {
            font-size: 14px;
            line-height: 1.7;
            color: var(--color-text-secondary);
        }
        .article-card .card-meta {
            font-size: 12px;
            color: #8A94A6;
        }

        /* ===== Sidebar ===== */
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 20px;
            position: sticky;
            top: 80px;
        }
        .sidebar-widget {
            background: var(--color-surface);
            border-radius: var(--radius-card);
            padding: 20px;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
        }
        .sidebar-widget h3 {
            font-size: 16px;
            line-height: 1.5;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 14px;
            padding-bottom: 10px;
            border-bottom: 1px solid var(--color-border);
        }
        .hot-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .hot-list li a {
            font-size: 13.5px;
            line-height: 1.6;
            color: var(--color-text-secondary);
            display: flex;
            align-items: flex-start;
            gap: 8px;
            transition: color 180ms ease;
        }
        .hot-list li a:hover {
            color: var(--color-primary);
        }
        .hot-list li a .dot {
            display: inline-block;
            width: 6px;
            height: 6px;
            border-radius: 50%;
            background: var(--color-accent);
            margin-top: 8px;
            flex-shrink: 0;
        }

        /* ===== Tag Cloud ===== */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            padding: 8px 0;
        }
        .tag-cloud a {
            display: inline-block;
            padding: 7px 16px;
            font-size: 13px;
            font-weight: 600;
            color: var(--color-text-secondary);
            background: var(--color-bg);
            border-radius: var(--radius-pill);
            border: 1px solid var(--color-border);
            transition: all 180ms ease;
        }
        .tag-cloud a:hover {
            color: var(--color-primary);
            border-color: var(--color-primary);
            background: #F0F5FC;
        }

        /* ===== Support Section ===== */
        .support-panel {
            background: var(--color-surface);
            border-radius: var(--radius-card);
            padding: 32px;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            align-items: center;
        }
        .support-stats {
            display: flex;
            gap: 28px;
            flex-wrap: wrap;
        }
        .stat-item {
            text-align: center;
        }
        .stat-item .stat-number {
            font-size: 32px;
            font-weight: 700;
            color: var(--color-primary);
            line-height: 1.3;
            font-variant-numeric: tabular-nums;
        }
        .stat-item .stat-label {
            font-size: 13px;
            color: var(--color-text-secondary);
        }
        .support-quote {
            font-size: 15px;
            line-height: 1.8;
            color: var(--color-text-secondary);
            border-left: 3px solid var(--color-accent);
            padding-left: 16px;
            font-style: italic;
        }

        /* ===== CTA Section ===== */
        .cta-simple {
            background: linear-gradient(135deg, #EFF6FF 0%, #FFFFFF 100%);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 28px 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
        }
        .cta-simple h3 {
            font-size: 20px;
            line-height: 1.45;
            font-weight: 700;
            color: var(--color-text);
        }
        .cta-simple p {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.7;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 24px;
            border-radius: var(--radius-btn);
            font-size: 15px;
            font-weight: 600;
            letter-spacing: 0.3px;
            transition: background 180ms ease, color 180ms ease, border-color 180ms ease, transform 180ms ease;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--color-primary);
            color: #fff;
            border: 1px solid var(--color-primary);
        }
        .btn-primary:hover {
            background: var(--color-primary-hover);
            border-color: var(--color-primary-hover);
            color: #fff;
            transform: translateY(-1px);
        }
        .btn-accent {
            background: var(--color-accent);
            color: #fff;
            border: 1px solid var(--color-accent);
        }
        .btn-accent:hover {
            background: #D07F1F;
            border-color: #D07F1F;
            color: #fff;
            transform: translateY(-1px);
        }
        .btn-outline {
            background: transparent;
            color: var(--color-primary);
            border: 1px solid var(--color-primary);
        }
        .btn-outline:hover {
            background: #F0F5FC;
            color: var(--color-primary-hover);
            border-color: var(--color-primary-hover);
        }

        /* ===== Related Categories ===== */
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .related-card {
            background: var(--color-surface);
            border-radius: var(--radius-card);
            padding: 20px;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
            transition: box-shadow 180ms ease, transform 180ms ease;
            text-align: left;
        }
        .related-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }
        .related-card h4 {
            font-size: 16px;
            line-height: 1.5;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .related-card h4 .icon {
            font-size: 18px;
            color: var(--color-primary);
        }
        .related-card p {
            font-size: 13.5px;
            line-height: 1.7;
            color: var(--color-text-secondary);
        }
        .related-card a {
            color: inherit;
            display: inline-block;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-primary);
            margin-top: 10px;
        }
        .related-card a:hover {
            color: var(--color-primary-hover);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #1A1F2E;
            color: #C7D2E3;
            padding: 48px 0 32px;
            margin-top: 48px;
        }
        .site-footer a {
            color: #C7D2E3;
            transition: color 180ms ease;
        }
        .site-footer a:hover {
            color: #fff;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 32px;
        }
        .footer-brand h3 {
            font-size: 20px;
            color: #fff;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.7;
            color: #8A94A6;
            max-width: 320px;
        }
        .footer-links h4 {
            font-size: 15px;
            color: #fff;
            margin-bottom: 14px;
            font-weight: 600;
        }
        .footer-links {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .footer-links a {
            font-size: 14px;
            line-height: 1.6;
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 12px 20px;
            padding-top: 20px;
            border-top: 1px solid rgba(199,210,227,0.15);
            font-size: 12px;
            color: #8A94A6;
        }
        .footer-bottom .beian {
            font-family: "SFMono-Regular", Consolas, "Courier New", monospace;
            font-size: 12px;
            color: #8A94A6;
        }
        .footer-bottom a {
            font-size: 12px;
            color: #C7D2E3;
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .content-layout {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .sidebar {
                position: static;
                flex-direction: row;
                flex-wrap: wrap;
                gap: 16px;
            }
            .sidebar-widget {
                flex: 1 1 240px;
            }
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .support-panel {
                grid-template-columns: 1fr;
                gap: 16px;
            }
        }
        @media (max-width: 768px) {
            .header-inner {
                min-height: 56px;
                flex-wrap: wrap;
                gap: 10px;
                padding: 10px 0;
            }
            .main-nav {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: var(--color-surface);
                flex-direction: column;
                align-items: stretch;
                padding: 12px 16px;
                gap: 4px;
                border-bottom: 1px solid var(--color-border);
                box-shadow: 0 8px 20px rgba(26,31,46,0.08);
            }
            #nav-checkbox:checked ~ .main-nav {
                display: flex;
            }
            .nav-toggle {
                display: flex;
                margin-left: auto;
            }
            .nav-item {
                padding: 10px 14px;
                width: 100%;
            }
            .nav-item:hover .dropdown-panel {
                display: none;
            }
            .nav-item .dropdown-panel {
                position: static;
                box-shadow: none;
                border: none;
                padding: 8px 0 8px 16px;
                display: none;
            }
            .nav-item.active .dropdown-panel,
            .nav-item:focus-within .dropdown-panel {
                display: block;
            }
            .dropdown-link {
                white-space: normal;
            }
            .category-banner {
                padding: 20px;
                flex-direction: column;
                align-items: flex-start;
                gap: 12px;
            }
            .category-banner h1 {
                font-size: 28px;
            }
            .category-banner .banner-desc {
                text-align: left;
                max-width: 100%;
            }
            .article-card {
                flex-direction: column;
                align-items: stretch;
            }
            .article-card .cover-img {
                width: 100%;
                height: 180px;
                border-radius: 10px;
            }
            .support-panel {
                padding: 20px;
            }
            .cta-simple {
                flex-direction: column;
                align-items: flex-start;
                text-align: left;
                padding: 20px;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }
        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .category-banner h1 {
                font-size: 24px;
            }
            .filter-bar {
                gap: 6px;
            }
            .filter-btn {
                padding: 6px 14px;
                font-size: 12px;
            }
            .article-card .cover-img {
                height: 150px;
            }
            .article-card .card-title {
                font-size: 15.5px;
            }
            .support-stats {
                gap: 16px;
                justify-content: space-between;
            }
            .stat-item .stat-number {
                font-size: 26px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 6px;
            }
        }

/* roulang page: category5 */
:root {
            --color-primary: #1D6FD1;
            --color-primary-hover: #155ABD;
            --color-accent: #E8952B;
            --color-bg: #F7F9FC;
            --color-surface: #FFFFFF;
            --color-text: #1A1F2E;
            --color-text-secondary: #5A6472;
            --color-border: #E1E8F0;
            --color-success: #2F9E5F;
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-pill: 999px;
            --shadow-card: 0 2px 14px rgba(26, 31, 46, 0.06);
            --shadow-card-hover: 0 8px 28px rgba(26, 31, 46, 0.12);
            --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            --container-max: 1200px;
            --section-padding: 72px 0;
            --section-padding-mobile: 44px 0;
        }

        *, *::before, *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 15.5px;
            line-height: 1.8;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color 180ms ease;
        }

        a:hover {
            color: var(--color-primary-hover);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-card);
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            font-size: 15px;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 8px rgba(26, 31, 46, 0.04);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 64px;
            gap: 20px;
        }

        .logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 6px;
            flex-shrink: 0;
        }

        .logo .logo-dot {
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--color-accent);
            margin-right: 4px;
            flex-shrink: 0;
        }

        .logo a {
            color: var(--color-primary);
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .logo a:hover {
            color: var(--color-primary-hover);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: nowrap;
        }

        .nav-item {
            position: relative;
            padding: 8px 12px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text);
            border-radius: var(--radius-btn);
            transition: background 180ms ease, color 180ms ease;
            cursor: pointer;
            white-space: nowrap;
        }

        .nav-item a {
            color: inherit;
        }

        .nav-item:hover {
            background: #F0F5FC;
            color: var(--color-primary);
        }

        .nav-item.active {
            color: var(--color-primary);
            background: #EDF4FC;
        }

        .nav-item .arrow {
            font-size: 10px;
            margin-left: 3px;
            display: inline-block;
            transition: transform 180ms ease;
        }

        .nav-item.dropdown:hover .arrow {
            transform: rotate(180deg);
        }

        .dropdown-panel {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            min-width: 260px;
            background: var(--color-surface);
            border-radius: 10px;
            padding: 16px;
            box-shadow: 0 8px 28px rgba(26, 31, 46, 0.12);
            border: 1px solid var(--color-border);
            z-index: 200;
        }

        .nav-item.dropdown:hover .dropdown-panel {
            display: block;
        }

        .dropdown-panel .dropdown-label {
            font-size: 11px;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: 0.8px;
            margin-bottom: 8px;
            text-transform: uppercase;
        }

        .dropdown-panel a {
            display: block;
            padding: 6px 10px;
            font-size: 13px;
            font-weight: 400;
            color: var(--color-text-secondary);
            border-radius: 6px;
            transition: background 150ms ease, color 150ms ease;
            white-space: normal;
            margin-bottom: 2px;
        }

        .dropdown-panel a:hover {
            background: #F0F5FC;
            color: var(--color-primary);
        }

        .dropdown-panel a:last-child {
            margin-bottom: 0;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            background: transparent;
            border: 1px solid var(--color-border);
            cursor: pointer;
        }

        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--color-text);
            border-radius: 2px;
            transition: all 200ms ease;
        }

        #nav-checkbox {
            display: none;
        }

        #nav-checkbox:checked~.main-nav {
            display: flex;
            flex-direction: column;
            position: absolute;
            top: 64px;
            left: 0;
            right: 0;
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            box-shadow: 0 16px 32px rgba(26, 31, 46, 0.12);
            padding: 16px 24px;
            gap: 4px;
            max-height: calc(100vh - 64px);
            overflow-y: auto;
        }

        #nav-checkbox:checked~.main-nav .nav-item {
            width: 100%;
            padding: 10px 12px;
        }

        #nav-checkbox:checked~.main-nav .dropdown-panel {
            position: static;
            box-shadow: none;
            border: none;
            padding: 8px 0 8px 16px;
            display: none;
        }

        #nav-checkbox:checked~.main-nav .nav-item.dropdown:hover .dropdown-panel {
            display: block;
        }

        #nav-checkbox:checked~.nav-toggle span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }

        #nav-checkbox:checked~.nav-toggle span:nth-child(2) {
            opacity: 0;
        }

        #nav-checkbox:checked~.nav-toggle span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* ===== Section Base ===== */
        .section {
            padding: var(--section-padding);
            position: relative;
        }

        .section-alt {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }

        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: 1px;
            margin-bottom: 8px;
        }

        .section-title {
            font-size: 26px;
            line-height: 1.3;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 12px;
        }

        .section-subtitle {
            font-size: 15.5px;
            line-height: 1.8;
            color: var(--color-text-secondary);
            margin-bottom: 32px;
            max-width: 720px;
        }

        /* ===== Breadcrumbs ===== */
        .breadcrumb {
            padding: 20px 0 0;
            font-size: 14px;
            color: var(--color-text-secondary);
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--color-text-secondary);
        }

        .breadcrumb a:hover {
            color: var(--color-primary);
        }

        .breadcrumb .separator {
            color: var(--color-border);
            user-select: none;
        }

        .breadcrumb .current {
            color: var(--color-text);
            font-weight: 600;
        }

        /* ===== Category Banner ===== */
        .category-banner {
            padding: 32px 0 20px;
            background: var(--color-bg);
            border-bottom: 1px solid var(--color-border);
        }

        .category-banner-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
        }

        .category-banner h1 {
            font-size: 34px;
            line-height: 1.25;
            font-weight: 700;
            color: var(--color-text);
            margin: 0;
        }

        .category-banner .banner-desc {
            font-size: 15.5px;
            color: var(--color-text-secondary);
            max-width: 480px;
            line-height: 1.7;
        }

        /* ===== Filter Bar ===== */
        .filter-bar {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 12px 16px;
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            margin: 24px 0 32px;
            box-shadow: var(--shadow-card);
        }

        .filter-bar .filter-label {
            font-size: 13px;
            font-weight: 600;
            color: var(--color-text-secondary);
            margin-right: 4px;
        }

        .filter-tag {
            display: inline-block;
            padding: 6px 16px;
            font-size: 13px;
            font-weight: 500;
            color: var(--color-text-secondary);
            background: var(--color-bg);
            border-radius: var(--radius-pill);
            border: 1px solid var(--color-border);
            transition: all 180ms ease;
            cursor: pointer;
            white-space: nowrap;
        }

        .filter-tag:hover {
            border-color: var(--color-primary);
            color: var(--color-primary);
            background: #EDF4FC;
        }

        .filter-tag.active {
            background: var(--color-primary);
            color: #FFFFFF;
            border-color: var(--color-primary);
        }

        /* ===== Article List ===== */
        .article-list-section {
            padding-bottom: 44px;
        }

        .article-list-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 20px;
        }

        .article-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            box-shadow: var(--shadow-card);
            padding: 16px;
            display: flex;
            gap: 16px;
            transition: box-shadow 180ms ease, transform 180ms ease, border-color 180ms ease;
        }

        .article-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: #D0DDEB;
        }

        .article-card .card-cover {
            flex-shrink: 0;
            width: 160px;
            height: 120px;
            border-radius: 10px;
            overflow: hidden;
        }

        .article-card .card-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 10px;
        }

        .article-card .card-body {
            flex: 1;
            min-width: 0;
        }

        .article-card .card-tags {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
            margin-bottom: 8px;
        }

        .article-card .tag-badge {
            display: inline-block;
            padding: 2px 10px;
            font-size: 12px;
            font-weight: 600;
            color: var(--color-primary);
            background: #EDF4FC;
            border-radius: var(--radius-pill);
            letter-spacing: 0.3px;
        }

        .article-card .tag-badge.accent {
            color: var(--color-accent);
            background: #FDF5EA;
        }

        .article-card .card-title {
            font-size: 17px;
            font-weight: 600;
            line-height: 1.5;
            color: var(--color-text);
            margin-bottom: 6px;
        }

        .article-card .card-title a {
            color: inherit;
        }

        .article-card .card-title a:hover {
            color: var(--color-primary);
        }

        .article-card .card-summary {
            font-size: 14px;
            line-height: 1.7;
            color: var(--color-text-secondary);
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .article-card .card-meta {
            font-size: 12.5px;
            color: var(--color-text-secondary);
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .article-card .card-meta .meta-date {
            font-variant-numeric: tabular-nums;
        }

        /* ===== Popular List ===== */
        .popular-section {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
            padding: 44px 0;
        }

        .popular-list {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 18px;
        }

        .popular-card {
            background: var(--color-bg);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 14px;
            display: flex;
            gap: 12px;
            align-items: center;
            transition: box-shadow 180ms ease, transform 180ms ease;
        }

        .popular-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }

        .popular-card .pop-cover {
            flex-shrink: 0;
            width: 64px;
            height: 48px;
            border-radius: 8px;
            overflow: hidden;
        }

        .popular-card .pop-cover img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 8px;
        }

        .popular-card .pop-rank {
            font-size: 24px;
            font-weight: 700;
            color: var(--color-primary);
            flex-shrink: 0;
            width: 32px;
            text-align: center;
            font-variant-numeric: tabular-nums;
        }

        .popular-card .pop-info {
            flex: 1;
            min-width: 0;
        }

        .popular-card .pop-title {
            font-size: 13.5px;
            font-weight: 600;
            color: var(--color-text);
            line-height: 1.5;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .popular-card .pop-title a {
            color: inherit;
        }

        .popular-card .pop-title a:hover {
            color: var(--color-primary);
        }

        .popular-card .pop-date {
            font-size: 12px;
            color: var(--color-text-secondary);
            margin-top: 2px;
        }

        /* ===== Topic Module ===== */
        .topic-section {
            padding: 56px 0;
        }

        .topic-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }

        .topic-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 24px 20px;
            box-shadow: var(--shadow-card);
            transition: box-shadow 180ms ease, transform 180ms ease;
        }

        .topic-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
        }

        .topic-card .topic-icon {
            font-size: 28px;
            margin-bottom: 12px;
            color: var(--color-accent);
        }

        .topic-card .topic-name {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 8px;
        }

        .topic-card .topic-desc {
            font-size: 14px;
            line-height: 1.7;
            color: var(--color-text-secondary);
            margin-bottom: 14px;
        }

        .topic-card .topic-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }

        .topic-card .topic-tags span {
            display: inline-block;
            padding: 3px 10px;
            font-size: 12px;
            font-weight: 500;
            color: var(--color-text-secondary);
            background: var(--color-bg);
            border-radius: var(--radius-pill);
            border: 1px solid var(--color-border);
        }

        /* ===== Support Section ===== */
        .support-section {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
            padding: 56px 0;
        }

        .support-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            align-items: start;
        }

        .support-text h2 {
            font-size: 22px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 14px;
            line-height: 1.4;
        }

        .support-text p {
            font-size: 15px;
            line-height: 1.8;
            color: var(--color-text-secondary);
            margin-bottom: 12px;
        }

        .support-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
        }

        .support-stat {
            background: var(--color-bg);
            border-radius: var(--radius-card);
            padding: 18px;
            text-align: center;
            border: 1px solid var(--color-border);
        }

        .support-stat .stat-number {
            font-size: 32px;
            font-weight: 700;
            color: var(--color-primary);
            font-variant-numeric: tabular-nums;
            line-height: 1.2;
        }

        .support-stat .stat-label {
            font-size: 13px;
            color: var(--color-text-secondary);
            margin-top: 6px;
        }

        /* ===== Single More Link ===== */
        .more-link-section {
            padding: 40px 0;
            text-align: center;
        }

        .more-link-btn {
            display: inline-block;
            padding: 12px 32px;
            font-size: 15px;
            font-weight: 600;
            color: var(--color-primary);
            background: var(--color-surface);
            border: 1px solid var(--color-primary);
            border-radius: var(--radius-btn);
            transition: all 180ms ease;
            cursor: pointer;
        }

        .more-link-btn:hover {
            background: #EDF4FC;
            border-color: var(--color-primary-hover);
            color: var(--color-primary-hover);
        }

        /* ===== Subscribe CTA ===== */
        .subscribe-cta {
            background: var(--color-bg);
            border-radius: var(--radius-card);
            border: 1px solid var(--color-border);
            padding: 24px 28px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
            box-shadow: var(--shadow-card);
        }

        .subscribe-cta .cta-text {
            font-size: 15.5px;
            font-weight: 600;
            color: var(--color-text);
            line-height: 1.6;
        }

        .subscribe-cta .cta-text .cta-highlight {
            color: var(--color-accent);
        }

        .btn {
            display: inline-block;
            padding: 11px 24px;
            font-size: 15px;
            font-weight: 600;
            border-radius: var(--radius-btn);
            transition: all 180ms ease;
            cursor: pointer;
            text-align: center;
            white-space: nowrap;
        }

        .btn-primary {
            background: var(--color-primary);
            color: #FFFFFF;
        }

        .btn-primary:hover {
            background: var(--color-primary-hover);
            color: #FFFFFF;
        }

        .btn-accent {
            background: var(--color-accent);
            color: #FFFFFF;
        }

        .btn-accent:hover {
            background: #d17e1e;
            color: #FFFFFF;
        }

        /* ===== Related Category ===== */
        .related-section {
            padding: 44px 0 56px;
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 18px;
        }

        .related-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 18px;
            box-shadow: var(--shadow-card);
            transition: box-shadow 180ms ease, transform 180ms ease;
            text-align: center;
        }

        .related-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }

        .related-card .related-name {
            font-size: 16px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 4px;
        }

        .related-card .related-desc {
            font-size: 13px;
            color: var(--color-text-secondary);
            line-height: 1.6;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #1A1F2E;
            color: #A8B2C1;
            padding: 48px 0 24px;
            margin-top: 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 28px;
        }

        .footer-brand h3 {
            color: #FFFFFF;
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .footer-brand p {
            font-size: 13.5px;
            line-height: 1.7;
            color: #A8B2C1;
            max-width: 360px;
        }

        .footer-links h4 {
            color: #FFFFFF;
            font-size: 14px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .footer-links a {
            display: block;
            color: #C7D2E3;
            font-size: 13.5px;
            padding: 3px 0;
            transition: color 150ms ease;
        }

        .footer-links a:hover {
            color: #FFFFFF;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding-top: 18px;
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
            justify-content: space-between;
            font-size: 12.5px;
            color: #8A94A6;
        }

        .footer-bottom .beian {
            font-family: "SF Mono", "Cascadia Code", "Consolas", monospace;
            font-size: 12px;
        }

        .footer-bottom a {
            color: #C7D2E3;
            font-size: 12.5px;
        }

        .footer-bottom a:hover {
            color: #FFFFFF;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .nav-toggle {
                display: flex;
            }

            .main-nav {
                display: none;
            }

            #nav-checkbox:checked~.main-nav {
                display: flex;
            }

            .support-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .support-stats {
                grid-template-columns: repeat(3, 1fr);
            }

            .popular-list {
                grid-template-columns: repeat(2, 1fr);
            }

            .topic-grid {
                grid-template-columns: repeat(2, 1fr);
            }

            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            :root {
                --section-padding: var(--section-padding-mobile);
            }

            .container {
                padding: 0 16px;
            }

            .category-banner-inner {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }

            .category-banner h1 {
                font-size: 28px;
            }

            .article-card {
                flex-direction: column;
                padding: 12px;
            }

            .article-card .card-cover {
                width: 100%;
                height: 180px;
                border-radius: 8px;
            }

            .popular-list {
                grid-template-columns: 1fr;
            }

            .topic-grid {
                grid-template-columns: 1fr;
            }

            .related-grid {
                grid-template-columns: 1fr;
            }

            .support-stats {
                grid-template-columns: repeat(3, 1fr);
                gap: 10px;
            }

            .support-stat .stat-number {
                font-size: 26px;
            }

            .subscribe-cta {
                flex-direction: column;
                align-items: flex-start;
                padding: 18px;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }

            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
                gap: 8px;
            }
        }

        @media (max-width: 520px) {
            .filter-bar {
                padding: 10px 12px;
            }

            .filter-tag {
                padding: 5px 12px;
                font-size: 12px;
            }

            .category-banner h1 {
                font-size: 24px;
            }

            .article-card .card-cover {
                height: 140px;
            }

            .article-card .card-title {
                font-size: 15.5px;
            }

            .support-stats {
                grid-template-columns: 1fr 1fr;
            }

            .support-stat .stat-number {
                font-size: 24px;
            }
        }

/* roulang page: category6 */
:root {
            --color-primary: #1D6FD1;
            --color-primary-hover: #155ABD;
            --color-accent: #E8952B;
            --color-bg: #F7F9FC;
            --color-surface: #FFFFFF;
            --color-text: #1A1F2E;
            --color-text-secondary: #5A6472;
            --color-border: #E1E8F0;
            --color-success: #2F9E5F;
            --radius-card: 14px;
            --radius-btn: 10px;
            --radius-pill: 999px;
            --shadow-card: 0 2px 14px rgba(26,31,46,0.06);
            --shadow-card-hover: 0 8px 28px rgba(26,31,46,0.12);
            --font-sans: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
            --container-max: 1200px;
            --section-padding: 72px 0;
            --section-padding-mobile: 44px 0;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-sans);
            font-size: 15.5px;
            line-height: 1.8;
            color: var(--color-text);
            background-color: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-bottom: 0;
        }

        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color 180ms ease;
        }

        a:hover {
            color: var(--color-primary-hover);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-card);
        }

        button {
            font-family: inherit;
            cursor: pointer;
            border: none;
            background: none;
            font-size: 15px;
        }

        input {
            font-family: inherit;
            font-size: 15px;
        }

        a:focus-visible,
        button:focus-visible,
        input:focus-visible {
            outline: 2px solid var(--color-primary);
            outline-offset: 2px;
        }

        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 8px rgba(26,31,46,0.04);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            min-height: 64px;
            gap: 20px;
        }

        .logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-primary);
            letter-spacing: 0.5px;
            white-space: nowrap;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .logo .logo-dot {
            display: inline-block;
            width: 10px;
            height: 10px;
            border-radius: 50%;
            background: var(--color-accent);
            margin-right: 4px;
        }

        .logo a {
            color: var(--color-primary);
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .logo a:hover {
            color: var(--color-primary-hover);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 2px;
        }

        .nav-item {
            position: relative;
            padding: 8px 14px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-text);
            border-radius: var(--radius-btn);
            transition: background 180ms ease, color 180ms ease;
            cursor: pointer;
            white-space: nowrap;
        }

        .nav-item a {
            color: inherit;
            display: inline-flex;
            align-items: center;
            gap: 3px;
        }

        .nav-item:hover {
            background: #F0F5FC;
            color: var(--color-primary);
        }

        .nav-item.active {
            color: var(--color-primary);
            background: #EDF4FC;
        }

        .nav-item .arrow {
            font-size: 10px;
            margin-left: 2px;
            display: inline-block;
            transition: transform 180ms ease;
        }

        .nav-item:hover .arrow {
            transform: rotate(180deg);
        }

        .dropdown-panel {
            position: absolute;
            top: calc(100% + 6px);
            left: 0;
            min-width: 260px;
            background: var(--color-surface);
            border-radius: 10px;
            box-shadow: var(--shadow-card-hover);
            border: 1px solid var(--color-border);
            padding: 16px;
            opacity: 0;
            visibility: hidden;
            transform: translateY(8px);
            transition: opacity 180ms ease, transform 180ms ease, visibility 180ms ease;
            z-index: 101;
        }

        .nav-item:hover .dropdown-panel,
        .nav-item:focus-within .dropdown-panel {
            opacity: 1;
            visibility: visible;
            transform: translateY(0);
        }

        .dropdown-panel .dropdown-label {
            display: inline-block;
            font-size: 11px;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: 0.5px;
            text-transform: uppercase;
            margin-bottom: 10px;
        }

        .dropdown-panel .dropdown-item {
            display: block;
            padding: 6px 10px;
            font-size: 13px;
            font-weight: 400;
            color: var(--color-text-secondary);
            border-radius: 6px;
            transition: background 150ms ease, color 150ms ease;
        }

        .dropdown-panel .dropdown-item:hover {
            background: #F0F5FC;
            color: var(--color-primary);
        }

        .dropdown-panel .dropdown-divider {
            height: 1px;
            background: var(--color-border);
            margin: 10px 0;
        }

        .dropdown-panel .dropdown-section-title {
            font-size: 12px;
            font-weight: 600;
            color: var(--color-text);
            margin-bottom: 8px;
            margin-top: 4px;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 8px;
            background: transparent;
            border: 1px solid var(--color-border);
            cursor: pointer;
        }

        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2px;
            background: var(--color-text);
            border-radius: 2px;
            transition: all 200ms ease;
        }

        #nav-checkbox {
            display: none;
        }

        /* ===== Section Base ===== */
        .section {
            padding: var(--section-padding);
            position: relative;
        }

        .section-alt {
            background: var(--color-surface);
            border-top: 1px solid var(--color-border);
            border-bottom: 1px solid var(--color-border);
        }

        .section-label {
            display: inline-block;
            font-size: 13px;
            font-weight: 700;
            color: var(--color-accent);
            letter-spacing: 1px;
            margin-bottom: 8px;
            text-transform: uppercase;
        }

        .section-title {
            font-size: 26px;
            font-weight: 700;
            line-height: 1.3;
            color: var(--color-text);
            margin-bottom: 14px;
        }

        .section-subtitle {
            font-size: 15.5px;
            color: var(--color-text-secondary);
            line-height: 1.8;
            max-width: 720px;
            margin-bottom: 24px;
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb-bar {
            background: var(--color-surface);
            border-bottom: 1px solid var(--color-border);
            padding: 16px 0;
        }

        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            color: var(--color-text-secondary);
            flex-wrap: wrap;
        }

        .breadcrumb a {
            color: var(--color-primary);
            font-weight: 500;
            transition: color 160ms ease;
        }

        .breadcrumb a:hover {
            color: var(--color-primary-hover);
        }

        .breadcrumb .sep {
            color: var(--color-border);
            user-select: none;
        }

        .breadcrumb .current {
            color: var(--color-text);
            font-weight: 600;
        }

        /* ===== Category H1 Banner ===== */
        .category-banner {
            background: linear-gradient(135deg, #F0F6FE 0%, #F7F9FC 70%);
            border-bottom: 1px solid var(--color-border);
            padding: 40px 0;
        }

        .category-banner-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
            flex-wrap: wrap;
        }

        .category-banner h1 {
            font-size: 34px;
            font-weight: 700;
            line-height: 1.25;
            color: var(--color-text);
        }

        .category-banner .banner-desc {
            font-size: 15.5px;
            color: var(--color-text-secondary);
            line-height: 1.7;
            max-width: 440px;
            text-align: right;
        }

        /* ===== Filter Bar ===== */
        .filter-bar {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 14px 18px;
            margin-bottom: 28px;
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
            box-shadow: var(--shadow-card);
        }

        .filter-bar .filter-label {
            font-size: 13px;
            font-weight: 600;
            color: var(--color-text-secondary);
            margin-right: 8px;
        }

        .filter-tag {
            display: inline-block;
            padding: 6px 14px;
            font-size: 13px;
            font-weight: 500;
            color: var(--color-text-secondary);
            background: transparent;
            border: 1px solid var(--color-border);
            border-radius: var(--radius-pill);
            transition: all 160ms ease;
            cursor: pointer;
            white-space: nowrap;
        }

        .filter-tag:hover {
            background: #F0F5FC;
            color: var(--color-primary);
            border-color: var(--color-primary);
        }

        .filter-tag.active-filter {
            background: var(--color-primary);
            color: var(--color-surface);
            border-color: var(--color-primary);
        }

        /* ===== Article Card List ===== */
        .article-card-list {
            display: flex;
            flex-direction: column;
            gap: 18px;
            margin-bottom: 32px;
        }

        .article-card-horizontal {
            display: flex;
            gap: 18px;
            background: var(--color-surface);
            border-radius: var(--radius-card);
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-card);
            padding: 16px;
            transition: box-shadow 180ms ease, transform 180ms ease, border-color 180ms ease;
            cursor: pointer;
        }

        .article-card-horizontal:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(29,111,209,0.25);
        }

        .article-card-horizontal .article-thumb {
            flex: 0 0 160px;
            height: 120px;
            overflow: hidden;
            border-radius: 10px;
            background: #E8EDF4;
        }

        .article-card-horizontal .article-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 10px;
            transition: transform 300ms ease;
        }

        .article-card-horizontal:hover .article-thumb img {
            transform: scale(1.04);
        }

        .article-card-horizontal .article-body {
            flex: 1;
            min-width: 0;
            display: flex;
            flex-direction: column;
            justify-content: center;
        }

        .article-card-horizontal .article-title {
            font-size: 17px;
            font-weight: 700;
            line-height: 1.45;
            color: var(--color-text);
            margin-bottom: 6px;
            display: block;
        }

        .article-card-horizontal .article-title:hover {
            color: var(--color-primary);
        }

        .article-card-horizontal .article-excerpt {
            font-size: 14px;
            color: var(--color-text-secondary);
            line-height: 1.7;
            margin-bottom: 10px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .article-card-horizontal .article-meta {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-wrap: wrap;
            font-size: 12.5px;
            color: var(--color-text-secondary);
        }

        .article-card-horizontal .article-date {
            font-size: 12.5px;
        }

        .article-card-horizontal .article-tag {
            display: inline-block;
            padding: 3px 10px;
            font-size: 11px;
            font-weight: 600;
            color: var(--color-primary);
            background: #EDF4FC;
            border-radius: var(--radius-pill);
        }

        /* ===== Sidebar Hot Section ===== */
        .hot-section {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 22px;
            box-shadow: var(--shadow-card);
            margin-bottom: 32px;
        }

        .hot-section .hot-title {
            font-size: 18px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 16px;
        }

        .hot-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .hot-list li {
            padding-bottom: 12px;
            border-bottom: 1px solid var(--color-border);
        }

        .hot-list li:last-child {
            border-bottom: none;
            padding-bottom: 0;
        }

        .hot-list a {
            display: block;
            font-size: 14.5px;
            font-weight: 500;
            color: var(--color-text);
            line-height: 1.55;
            transition: color 160ms ease;
        }

        .hot-list a:hover {
            color: var(--color-primary);
        }

        .hot-list .hot-rank {
            display: inline-block;
            width: 22px;
            height: 22px;
            line-height: 22px;
            text-align: center;
            background: #F0F5FC;
            color: var(--color-primary);
            font-size: 12px;
            font-weight: 700;
            border-radius: 6px;
            margin-right: 8px;
        }

        .hot-list .hot-rank.rank-top {
            background: var(--color-accent);
            color: var(--color-surface);
        }

        /* ===== Topic Tag Cloud ===== */
        .topic-tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 28px;
        }

        .topic-tag-card {
            display: inline-block;
            padding: 8px 18px;
            font-size: 13.5px;
            font-weight: 500;
            color: var(--color-text);
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-pill);
            box-shadow: var(--shadow-card);
            transition: all 160ms ease;
            cursor: pointer;
            white-space: nowrap;
        }

        .topic-tag-card:hover {
            background: #F0F5FC;
            color: var(--color-primary);
            border-color: var(--color-primary);
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-2px);
        }

        /* ===== Support Section ===== */
        .support-section {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 28px;
            box-shadow: var(--shadow-card);
            margin-bottom: 28px;
        }

        .support-section .support-title {
            font-size: 20px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 14px;
        }

        .support-section p {
            font-size: 15px;
            color: var(--color-text-secondary);
            line-height: 1.8;
            margin-bottom: 14px;
        }

        .support-section p:last-child {
            margin-bottom: 0;
        }

        .support-stats {
            display: flex;
            gap: 24px;
            flex-wrap: wrap;
            margin-top: 20px;
        }

        .support-stat-item {
            text-align: center;
            min-width: 100px;
        }

        .support-stat-item .stat-number {
            font-size: 28px;
            font-weight: 700;
            color: var(--color-primary);
            font-family: 'Segoe UI', system-ui, sans-serif;
            letter-spacing: -0.5px;
        }

        .support-stat-item .stat-label {
            font-size: 12px;
            color: var(--color-text-secondary);
            margin-top: 4px;
        }

        /* ===== More Entry Button ===== */
        .more-entry-wrap {
            text-align: center;
            margin: 20px 0 32px;
        }

        .btn-more-entry {
            display: inline-block;
            padding: 10px 28px;
            font-size: 14px;
            font-weight: 600;
            color: var(--color-primary);
            background: transparent;
            border: 1px solid var(--color-primary);
            border-radius: var(--radius-btn);
            transition: all 180ms ease;
            cursor: pointer;
            letter-spacing: 0.3px;
        }

        .btn-more-entry:hover {
            background: #F0F5FC;
            color: var(--color-primary-hover);
            border-color: var(--color-primary-hover);
        }

        /* ===== Subscribe CTA ===== */
        .subscribe-cta {
            background: linear-gradient(135deg, #1D6FD1 0%, #155ABD 60%);
            border-radius: var(--radius-card);
            padding: 32px 28px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
            margin-bottom: 28px;
            box-shadow: var(--shadow-card);
        }

        .subscribe-cta .cta-text {
            flex: 1;
            min-width: 220px;
        }

        .subscribe-cta .cta-text h3 {
            font-size: 20px;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 6px;
        }

        .subscribe-cta .cta-text p {
            font-size: 14px;
            color: rgba(255,255,255,0.85);
            line-height: 1.6;
            margin-bottom: 0;
        }

        .btn-subscribe {
            display: inline-block;
            padding: 11px 26px;
            font-size: 14px;
            font-weight: 700;
            color: #1A1F2E;
            background: var(--color-accent);
            border-radius: var(--radius-btn);
            transition: all 180ms ease;
            cursor: pointer;
            letter-spacing: 0.3px;
            white-space: nowrap;
        }

        .btn-subscribe:hover {
            background: #D9811E;
            transform: translateY(-2px);
            box-shadow: 0 4px 14px rgba(232,149,43,0.35);
        }

        /* ===== Related Categories ===== */
        .related-categories {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 16px;
            margin-bottom: 24px;
        }

        .related-cat-card {
            background: var(--color-surface);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-card);
            padding: 20px;
            box-shadow: var(--shadow-card);
            text-align: center;
            transition: all 180ms ease;
        }

        .related-cat-card:hover {
            box-shadow: var(--shadow-card-hover);
            transform: translateY(-3px);
            border-color: rgba(29,111,209,0.25);
        }

        .related-cat-card .related-cat-name {
            font-size: 16px;
            font-weight: 700;
            color: var(--color-text);
            margin-bottom: 6px;
        }

        .related-cat-card .related-cat-desc {
            font-size: 13px;
            color: var(--color-text-secondary);
            line-height: 1.6;
        }

        .related-cat-card a {
            display: block;
            padding: 6px 0;
        }

        .related-cat-card a:hover .related-cat-name {
            color: var(--color-primary);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #1A1F2E;
            color: rgba(255,255,255,0.75);
            padding: 48px 0 24px;
            margin-top: 36px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 32px;
            margin-bottom: 28px;
        }

        .footer-brand h3 {
            font-size: 20px;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 10px;
        }

        .footer-brand p {
            font-size: 13.5px;
            line-height: 1.7;
            color: rgba(255,255,255,0.65);
            max-width: 300px;
        }

        .footer-links h4 {
            font-size: 14px;
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 12px;
        }

        .footer-links a {
            display: block;
            font-size: 13.5px;
            color: #C7D2E3;
            padding: 4px 0;
            transition: color 160ms ease;
        }

        .footer-links a:hover {
            color: #FFFFFF;
        }

        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.12);
            padding-top: 18px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 12px;
            color: rgba(255,255,255,0.55);
        }

        .footer-bottom .beian {
            font-family: 'SF Mono', 'Consolas', 'Monaco', monospace;
            font-size: 11.5px;
            letter-spacing: 0.2px;
        }

        .footer-bottom a {
            color: #C7D2E3;
            font-size: 12px;
            transition: color 160ms ease;
        }

        .footer-bottom a:hover {
            color: #FFFFFF;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .main-nav {
                gap: 0;
            }
            .nav-item {
                padding: 6px 10px;
                font-size: 13px;
            }
            .dropdown-panel {
                min-width: 220px;
            }
            .article-card-horizontal .article-thumb {
                flex: 0 0 140px;
                height: 105px;
            }
        }

        @media (max-width: 860px) {
            .nav-toggle {
                display: flex;
            }
            .main-nav {
                display: none;
                position: absolute;
                top: 64px;
                left: 0;
                right: 0;
                background: var(--color-surface);
                flex-direction: column;
                align-items: stretch;
                border-bottom: 1px solid var(--color-border);
                box-shadow: var(--shadow-card);
                padding: 12px 16px;
                gap: 4px;
                max-height: 70vh;
                overflow-y: auto;
            }
            #nav-checkbox:checked~.main-nav {
                display: flex;
            }
            #nav-checkbox:checked~.nav-toggle span:nth-child(1) {
                transform: translateY(7px) rotate(45deg);
            }
            #nav-checkbox:checked~.nav-toggle span:nth-child(2) {
                opacity: 0;
            }
            #nav-checkbox:checked~.nav-toggle span:nth-child(3) {
                transform: translateY(-7px) rotate(-45deg);
            }
            .nav-item {
                padding: 10px 14px;
                font-size: 15px;
                border-radius: 8px;
                white-space: normal;
            }
            .nav-item .dropdown-panel {
                position: static;
                opacity: 1;
                visibility: visible;
                transform: none;
                box-shadow: none;
                border: 1px solid var(--color-border);
                margin-top: 6px;
                min-width: auto;
                display: none;
            }
            .nav-item:hover .dropdown-panel,
            .nav-item:focus-within .dropdown-panel {
                display: block;
            }
            .nav-toggle {
                display: flex;
            }
            .category-banner-inner {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
            }
            .category-banner .banner-desc {
                text-align: left;
                max-width: 100%;
            }
            .article-card-horizontal {
                flex-direction: column;
                gap: 12px;
                padding: 14px;
            }
            .article-card-horizontal .article-thumb {
                flex: none;
                width: 100%;
                height: 180px;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                align-items: flex-start;
            }
        }

        @media (max-width: 640px) {
            :root {
                --section-padding: 40px 0;
            }
            .container {
                padding: 0 16px;
            }
            .category-banner {
                padding: 28px 0;
            }
            .category-banner h1 {
                font-size: 28px;
            }
            .section-title {
                font-size: 22px;
            }
            .article-card-horizontal .article-title {
                font-size: 15.5px;
            }
            .article-card-horizontal .article-excerpt {
                font-size: 13px;
            }
            .related-categories {
                grid-template-columns: 1fr;
                gap: 12px;
            }
            .subscribe-cta {
                flex-direction: column;
                align-items: flex-start;
                text-align: left;
            }
            .btn-subscribe {
                width: 100%;
                text-align: center;
            }
            .support-stats {
                justify-content: flex-start;
            }
            .filter-bar {
                padding: 12px 14px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .article-card-horizontal .article-thumb {
                height: 150px;
            }
        }

        @media (max-width: 480px) {
            .category-banner h1 {
                font-size: 24px;
            }
            .section-title {
                font-size: 20px;
            }
            .article-card-horizontal .article-thumb {
                height: 130px;
            }
            .article-card-horizontal .article-meta {
                gap: 6px;
                font-size: 11.5px;
            }
            .article-card-horizontal .article-tag {
                font-size: 10px;
                padding: 2px 8px;
            }
            .support-stat-item .stat-number {
                font-size: 22px;
            }
        }