/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a1a2e;
            --primary-light: #16213e;
            --accent: #e94560;
            --accent-hover: #d63850;
            --accent-light: #fde8ec;
            --gold: #f5a623;
            --gold-light: #fef3d9;
            --bg-body: #f4f6fa;
            --bg-card: #ffffff;
            --bg-dark: #0f0f1a;
            --bg-section-alt: #f0f2f8;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-muted: #8a8aaa;
            --text-inverse: #ffffff;
            --border-color: #e8eaf0;
            --border-light: #f0f2f6;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(26, 26, 46, 0.06);
            --shadow-md: 0 6px 24px rgba(26, 26, 46, 0.08);
            --shadow-lg: 0 16px 48px rgba(26, 26, 46, 0.12);
            --shadow-glow: 0 0 30px rgba(233, 69, 96, 0.15);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 260px;
            --sidebar-collapsed: 72px;
            --header-height: 0px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --max-width: 1200px;
            --gap: 32px;
            --gap-lg: 48px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            display: flex;
            min-height: 100vh;
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent-hover);
        }
        a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: 4px;
        }

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

        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }

        button {
            cursor: pointer;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: var(--bg-body);
        }
        ::-webkit-scrollbar-thumb {
            background: var(--text-muted);
            border-radius: 10px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: var(--text-secondary);
        }

        /* ===== Sidebar Navigation (App Shell) ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-dark);
            color: var(--text-inverse);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition), width var(--transition);
            overflow-y: auto;
            overflow-x: hidden;
            border-right: 1px solid rgba(255, 255, 255, 0.05);
        }

        .sidebar-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 28px 24px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
            flex-shrink: 0;
        }

        .sidebar-logo .logo-icon {
            width: 40px;
            height: 40px;
            background: var(--accent);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 22px;
            font-weight: 700;
            color: #fff;
            flex-shrink: 0;
        }

        .sidebar-logo .logo-text {
            font-size: 20px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: #fff;
            line-height: 1.2;
        }
        .sidebar-logo .logo-text span {
            color: var(--accent);
        }

        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .sidebar-nav .nav-label {
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 1.2px;
            color: rgba(255, 255, 255, 0.3);
            padding: 16px 12px 8px;
            font-weight: 600;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.7);
            font-size: 15px;
            font-weight: 500;
            transition: all var(--transition);
            position: relative;
        }

        .sidebar-nav a i {
            width: 22px;
            text-align: center;
            font-size: 18px;
            flex-shrink: 0;
        }

        .sidebar-nav a:hover {
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
        }

        .sidebar-nav a.active {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 16px rgba(233, 69, 96, 0.3);
        }

        .sidebar-nav a.active::before {
            content: '';
            position: absolute;
            left: -12px;
            top: 50%;
            transform: translateY(-50%);
            width: 4px;
            height: 24px;
            background: var(--accent);
            border-radius: 0 4px 4px 0;
        }

        .sidebar-footer {
            padding: 16px 20px 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 12px;
            color: rgba(255, 255, 255, 0.3);
            text-align: center;
            flex-shrink: 0;
        }

        /* ===== Mobile Header ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 64px;
            background: var(--bg-dark);
            z-index: 999;
            align-items: center;
            justify-content: space-between;
            padding: 0 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .mobile-header .logo-text {
            font-size: 18px;
            font-weight: 700;
            color: #fff;
        }
        .mobile-header .logo-text span {
            color: var(--accent);
        }

        .mobile-toggle {
            width: 42px;
            height: 42px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 22px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.06);
            transition: background var(--transition);
        }
        .mobile-toggle:hover {
            background: rgba(255, 255, 255, 0.12);
        }

        /* ===== Overlay ===== */
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 998;
            backdrop-filter: blur(4px);
            opacity: 0;
            transition: opacity var(--transition);
        }
        .sidebar-overlay.open {
            opacity: 1;
        }

        /* ===== Main Content ===== */
        .main-wrapper {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            transition: margin-left var(--transition);
        }

        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 var(--gap);
        }

        /* ===== Hero Section ===== */
        .hero {
            position: relative;
            min-height: 520px;
            display: flex;
            align-items: center;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-repeat: no-repeat;
            overflow: hidden;
            padding: 80px 0 60px;
        }

        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 15, 26, 0.88) 0%, rgba(15, 15, 26, 0.6) 60%, rgba(233, 69, 96, 0.2) 100%);
            pointer-events: none;
        }

        .hero .container {
            position: relative;
            z-index: 2;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(233, 69, 96, 0.2);
            border: 1px solid rgba(233, 69, 96, 0.3);
            color: var(--accent);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.3px;
            margin-bottom: 20px;
            backdrop-filter: blur(8px);
        }
        .hero-badge i {
            font-size: 14px;
        }

        .hero h1 {
            font-size: 52px;
            font-weight: 800;
            color: #fff;
            line-height: 1.15;
            margin-bottom: 16px;
            max-width: 720px;
        }
        .hero h1 span {
            background: linear-gradient(135deg, var(--accent), var(--gold));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 580px;
            line-height: 1.8;
            margin-bottom: 32px;
        }

        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 15px;
            font-weight: 600;
            transition: all var(--transition);
            border: none;
            line-height: 1;
        }

        .btn-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 20px rgba(233, 69, 96, 0.35);
        }
        .btn-primary:hover {
            background: var(--accent-hover);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(233, 69, 96, 0.45);
        }

        .btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.25);
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
        }

        .btn-sm {
            padding: 10px 22px;
            font-size: 13px;
        }

        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 40px;
            padding-top: 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
        }

        .hero-stat h3 {
            font-size: 32px;
            font-weight: 800;
            color: #fff;
            line-height: 1;
        }
        .hero-stat h3 span {
            color: var(--accent);
        }
        .hero-stat p {
            font-size: 13px;
            color: rgba(255, 255, 255, 0.5);
            margin-bottom: 0;
        }

        /* ===== Section Common ===== */
        section {
            padding: 80px 0;
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-header h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }

        .section-header p {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.8;
        }

        .section-header .section-tag {
            display: inline-block;
            background: var(--accent-light);
            color: var(--accent);
            padding: 4px 16px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .section-alt {
            background: var(--bg-section-alt);
        }

        /* ===== Features / Core Values ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap);
        }

        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 36px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            text-align: center;
        }

        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: transparent;
        }

        .feature-card .icon-box {
            width: 64px;
            height: 64px;
            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 20px;
            font-size: 28px;
            color: #fff;
            background: var(--accent);
        }

        .feature-card .icon-box.gold {
            background: var(--gold);
        }
        .feature-card .icon-box.dark {
            background: var(--primary);
        }

        .feature-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--primary);
        }

        .feature-card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
        }

        /* ===== Category Entry ===== */
        .category-card {
            background: var(--bg-dark);
            border-radius: var(--radius-lg);
            padding: 48px 40px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            position: relative;
            overflow: hidden;
        }

        .category-card::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 15, 26, 0.9) 0%, rgba(15, 15, 26, 0.5) 100%);
            pointer-events: none;
        }

        .category-card>* {
            position: relative;
            z-index: 2;
        }

        .category-card .cat-text h3 {
            font-size: 28px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
        }
        .category-card .cat-text p {
            font-size: 15px;
            color: rgba(255, 255, 255, 0.65);
            max-width: 400px;
        }

        /* ===== Latest Posts / CMS List ===== */
        .posts-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--gap);
        }

        .post-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
        }

        .post-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        .post-card .post-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            border-radius: 0;
        }

        .post-card .post-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .post-card .post-cat {
            display: inline-block;
            background: var(--accent-light);
            color: var(--accent);
            padding: 2px 14px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            margin-bottom: 10px;
            align-self: flex-start;
        }

        .post-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .post-card h3 a {
            color: inherit;
        }
        .post-card h3 a:hover {
            color: var(--accent);
        }

        .post-card .post-excerpt {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.7;
            flex: 1;
            margin-bottom: 12px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }

        .post-card .post-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--text-muted);
            border-top: 1px solid var(--border-light);
            padding-top: 14px;
        }
        .post-card .post-meta i {
            margin-right: 4px;
        }

        .empty-posts {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            color: var(--text-muted);
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-color);
        }
        .empty-posts i {
            font-size: 48px;
            margin-bottom: 16px;
            color: var(--border-color);
        }
        .empty-posts p {
            font-size: 16px;
        }

        /* ===== How We Test / Process ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .process-step {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            position: relative;
        }

        .process-step:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-sm);
        }

        .process-step .step-num {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--accent);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            font-weight: 800;
            margin: 0 auto 16px;
        }

        .process-step .step-num.gold {
            background: var(--gold);
        }
        .process-step .step-num.dark {
            background: var(--primary);
        }
        .process-step .step-num.teal {
            background: #0ea5a9;
        }

        .process-step h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 6px;
        }
        .process-step p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== Stats / Data ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap);
        }

        .stat-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 36px 24px;
            text-align: center;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
        }

        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        .stat-card .stat-number {
            font-size: 42px;
            font-weight: 800;
            color: var(--accent);
            line-height: 1;
            margin-bottom: 6px;
        }
        .stat-card .stat-number.gold {
            color: var(--gold);
        }
        .stat-card .stat-number.dark {
            color: var(--primary);
        }
        .stat-card .stat-label {
            font-size: 15px;
            color: var(--text-secondary);
            font-weight: 500;
        }

        /* ===== Tags ===== */
        .tags-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
        }

        .tag-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 8px 20px;
            border-radius: 50px;
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            color: var(--text-secondary);
            font-size: 14px;
            font-weight: 500;
            transition: all var(--transition);
        }

        .tag-item:hover {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
            transform: translateY(-2px);
            box-shadow: 0 4px 16px rgba(233, 69, 96, 0.25);
        }

        .tag-item i {
            font-size: 14px;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow: hidden;
            transition: all var(--transition);
        }

        .faq-item:hover {
            border-color: var(--accent);
        }

        .faq-question {
            padding: 20px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            color: var(--primary);
            transition: color var(--transition);
            background: none;
            width: 100%;
            text-align: left;
        }

        .faq-question i {
            font-size: 18px;
            color: var(--accent);
            transition: transform var(--transition);
            flex-shrink: 0;
        }

        .faq-question.open i {
            transform: rotate(180deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 15px;
            line-height: 1.8;
        }

        .faq-answer.open {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            position: relative;
        }

        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 15, 26, 0.88) 0%, rgba(15, 15, 26, 0.6) 100%);
            pointer-events: none;
        }

        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .cta-section h2 {
            font-size: 36px;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.7);
            max-width: 500px;
            margin: 0 auto 28px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 48px 0 32px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }

        .footer-brand .logo-text {
            font-size: 20px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
            display: block;
        }
        .footer-brand .logo-text span {
            color: var(--accent);
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            color: rgba(255, 255, 255, 0.5);
            max-width: 320px;
        }

        .footer-col h4 {
            font-size: 14px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .footer-col a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.55);
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.35);
        }

        .footer-bottom a {
            color: rgba(255, 255, 255, 0.45);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            :root {
                --gap: 24px;
                --gap-lg: 36px;
                --sidebar-width: 220px;
            }

            .hero h1 {
                font-size: 40px;
            }

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

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

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

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

        @media (max-width: 768px) {
            :root {
                --sidebar-width: 0px;
                --gap: 20px;
                --gap-lg: 28px;
            }

            .sidebar {
                transform: translateX(-100%);
                width: 280px;
            }

            .sidebar.open {
                transform: translateX(0);
            }

            .mobile-header {
                display: flex;
            }

            .main-wrapper {
                margin-left: 0;
                padding-top: 64px;
            }

            .hero {
                min-height: 420px;
                padding: 60px 0 40px;
            }

            .hero h1 {
                font-size: 30px;
            }
            .hero p {
                font-size: 16px;
            }
            .hero-stats {
                gap: 24px;
                flex-wrap: wrap;
            }
            .hero-stat h3 {
                font-size: 24px;
            }

            .section-header h2 {
                font-size: 26px;
            }

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

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

            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }

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

            .category-card {
                flex-direction: column;
                text-align: center;
                padding: 36px 24px;
            }
            .category-card .cat-text p {
                max-width: 100%;
            }

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

            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-actions .btn {
                justify-content: center;
            }
        }

        @media (max-width: 520px) {
            .hero h1 {
                font-size: 26px;
            }
            .hero-stats {
                flex-direction: column;
                gap: 16px;
            }
            .stats-grid {
                grid-template-columns: 1fr;
            }
            .section-header h2 {
                font-size: 22px;
            }
            .container {
                padding: 0 16px;
            }
            section {
                padding: 48px 0;
            }
            .faq-question {
                font-size: 14px;
                padding: 16px 18px;
            }
            .faq-answer {
                font-size: 14px;
            }
            .stat-card .stat-number {
                font-size: 32px;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-1 {
            margin-top: 16px;
        }
        .mt-2 {
            margin-top: 32px;
        }
        .gap-1 {
            gap: 16px;
        }

        /* ===== Sidebar open state for mobile ===== */
        body.sidebar-open .sidebar-overlay {
            display: block;
            opacity: 1;
        }
        body.sidebar-open .sidebar {
            transform: translateX(0);
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --color-primary: #1a56db;
            --color-primary-light: #3b82f6;
            --color-primary-dark: #1e40af;
            --color-secondary: #f59e0b;
            --color-secondary-light: #fbbf24;
            --color-bg: #f8f9fc;
            --color-bg-alt: #ffffff;
            --color-bg-dark: #0f172a;
            --color-text: #1e293b;
            --color-text-secondary: #64748b;
            --color-text-light: #94a3b8;
            --color-text-inverse: #ffffff;
            --color-border: #e2e8f0;
            --color-border-light: #f1f5f9;
            --color-success: #10b981;
            --color-warning: #f59e0b;
            --color-danger: #ef4444;
            --color-info: #06b6d4;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
            --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 24px 60px rgba(0, 0, 0, 0.18);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 240px;
            --header-height: 0px;
            --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --spacing-xs: 4px;
            --spacing-sm: 8px;
            --spacing-md: 16px;
            --spacing-lg: 24px;
            --spacing-xl: 32px;
            --spacing-2xl: 48px;
            --spacing-3xl: 64px;
            --container-max: 1200px;
        }

        /* ===== Reset / Base ===== */
        *,
        *::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: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background: var(--color-bg);
            display: flex;
            min-height: 100vh;
        }
        a {
            color: var(--color-primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--color-primary-light);
        }
        a:focus-visible {
            outline: 2px solid var(--color-primary-light);
            outline-offset: 2px;
            border-radius: var(--radius-sm);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--color-text);
        }
        h1 {
            font-size: 2.4rem;
        }
        h2 {
            font-size: 1.8rem;
        }
        h3 {
            font-size: 1.35rem;
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            margin-bottom: 1rem;
            color: var(--color-text-secondary);
        }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 var(--spacing-lg);
            width: 100%;
        }

        /* ===== 侧边栏导航 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--color-bg-alt);
            border-right: 1px solid var(--color-border);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition);
            overflow-y: auto;
        }
        .sidebar-brand {
            padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-md);
            border-bottom: 1px solid var(--color-border-light);
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }
        .logo-text {
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--color-text);
            letter-spacing: -0.5px;
        }
        .logo-text span {
            color: var(--color-primary);
        }
        .sidebar-nav {
            padding: var(--spacing-md) var(--spacing-sm);
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: var(--spacing-xs);
        }
        .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--color-text-light);
            padding: var(--spacing-sm) var(--spacing-md);
            font-weight: 600;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: var(--spacing-md);
            padding: var(--spacing-sm) var(--spacing-md);
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--color-text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1.05rem;
            color: var(--color-text-light);
            transition: color var(--transition);
        }
        .sidebar-nav a:hover {
            background: var(--color-border-light);
            color: var(--color-text);
        }
        .sidebar-nav a:hover i {
            color: var(--color-primary);
        }
        .sidebar-nav a.active {
            background: rgba(26, 86, 219, 0.08);
            color: var(--color-primary);
            font-weight: 600;
        }
        .sidebar-nav a.active i {
            color: var(--color-primary);
        }
        .sidebar-nav a.active::before {
            content: '';
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
            width: 3px;
            height: 24px;
            background: var(--color-primary);
            border-radius: 0 3px 3px 0;
        }
        .sidebar-footer {
            padding: var(--spacing-md) var(--spacing-lg);
            border-top: 1px solid var(--color-border-light);
            font-size: 0.75rem;
            color: var(--color-text-light);
            text-align: center;
        }

        /* ===== 主内容区 ===== */
        .main-wrapper {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .main-content {
            flex: 1;
            padding-bottom: var(--spacing-3xl);
        }

        /* ===== 移动端菜单按钮 ===== */
        .menu-toggle {
            display: none;
            position: fixed;
            top: var(--spacing-md);
            left: var(--spacing-md);
            z-index: 1100;
            background: var(--color-bg-alt);
            border: 1px solid var(--color-border);
            border-radius: var(--radius-sm);
            padding: var(--spacing-sm) var(--spacing-md);
            font-size: 1.2rem;
            color: var(--color-text);
            box-shadow: var(--shadow-sm);
            cursor: pointer;
            transition: all var(--transition);
        }
        .menu-toggle:hover {
            background: var(--color-border-light);
        }
        .menu-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.4);
            z-index: 999;
            opacity: 0;
            transition: opacity var(--transition);
        }
        .menu-overlay.open {
            opacity: 1;
        }

        /* ===== 页面头部 ===== */
        .page-header {
            background: var(--color-bg-alt);
            border-bottom: 1px solid var(--color-border-light);
            padding: var(--spacing-xl) 0;
            position: relative;
        }
        .page-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--spacing-md);
        }
        .page-header-left h1 {
            font-size: 1.75rem;
            margin-bottom: var(--spacing-xs);
            display: flex;
            align-items: center;
            gap: var(--spacing-sm);
        }
        .page-header-left h1 i {
            color: var(--color-primary);
        }
        .page-header-left p {
            color: var(--color-text-secondary);
            font-size: 0.95rem;
            margin-bottom: 0;
        }
        .page-header-right {
            display: flex;
            align-items: center;
            gap: var(--spacing-md);
            flex-wrap: wrap;
        }
        .tag-filter {
            display: flex;
            gap: var(--spacing-sm);
            flex-wrap: wrap;
        }
        .tag-filter a {
            display: inline-block;
            padding: var(--spacing-xs) var(--spacing-md);
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            background: var(--color-border-light);
            color: var(--color-text-secondary);
            transition: all var(--transition);
            border: 1px solid transparent;
        }
        .tag-filter a:hover {
            background: var(--color-primary);
            color: var(--color-text-inverse);
            border-color: var(--color-primary);
        }
        .tag-filter a.active {
            background: var(--color-primary);
            color: var(--color-text-inverse);
            border-color: var(--color-primary);
        }

        /* ===== 板块通用 ===== */
        .section {
            padding: var(--spacing-2xl) 0;
        }
        .section-alt {
            background: var(--color-bg-alt);
        }
        .section-dark {
            background: var(--color-bg-dark);
            color: var(--color-text-inverse);
        }
        .section-dark h2,
        .section-dark h3,
        .section-dark p {
            color: var(--color-text-inverse);
        }
        .section-dark p {
            color: rgba(255, 255, 255, 0.8);
        }
        .section-header {
            text-align: center;
            margin-bottom: var(--spacing-2xl);
        }
        .section-header h2 {
            margin-bottom: var(--spacing-sm);
        }
        .section-header p {
            max-width: 600px;
            margin: 0 auto;
            font-size: 1.05rem;
        }
        .section-header .badge {
            display: inline-block;
            padding: var(--spacing-xs) var(--spacing-md);
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            background: rgba(26, 86, 219, 0.1);
            color: var(--color-primary);
            margin-bottom: var(--spacing-sm);
            letter-spacing: 0.5px;
        }

        /* ===== 卡片网格 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-lg);
        }
        .card {
            background: var(--color-bg-alt);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .card-image {
            position: relative;
            overflow: hidden;
            aspect-ratio: 16 / 10;
            background: var(--color-border-light);
        }
        .card-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .card:hover .card-image img {
            transform: scale(1.05);
        }
        .card-image .tag {
            position: absolute;
            top: var(--spacing-sm);
            left: var(--spacing-sm);
            background: var(--color-primary);
            color: var(--color-text-inverse);
            padding: 2px 12px;
            border-radius: 12px;
            font-size: 0.75rem;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        .card-body {
            padding: var(--spacing-lg);
        }
        .card-body h3 {
            font-size: 1.1rem;
            margin-bottom: var(--spacing-sm);
            line-height: 1.4;
        }
        .card-body h3 a {
            color: var(--color-text);
        }
        .card-body h3 a:hover {
            color: var(--color-primary);
        }
        .card-body p {
            font-size: 0.9rem;
            margin-bottom: var(--spacing-md);
            color: var(--color-text-secondary);
        }
        .card-meta {
            display: flex;
            align-items: center;
            gap: var(--spacing-md);
            font-size: 0.8rem;
            color: var(--color-text-light);
            padding-top: var(--spacing-sm);
            border-top: 1px solid var(--color-border-light);
        }
        .card-meta i {
            margin-right: var(--spacing-xs);
        }
        .card-meta .rating {
            color: var(--color-secondary);
            font-weight: 600;
        }

        /* ===== 特色卡片（大图/横排） ===== */
        .feature-card {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--spacing-xl);
            background: var(--color-bg-alt);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
            overflow: hidden;
            box-shadow: var(--shadow-md);
            transition: all var(--transition);
        }
        .feature-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-2px);
        }
        .feature-card .feature-image {
            aspect-ratio: 4 / 3;
            background: var(--color-border-light);
            overflow: hidden;
        }
        .feature-card .feature-image img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .feature-card:hover .feature-image img {
            transform: scale(1.03);
        }
        .feature-card .feature-body {
            padding: var(--spacing-xl);
            display: flex;
            flex-direction: column;
            justify-content: center;
        }
        .feature-card .feature-body .badge {
            display: inline-block;
            padding: 2px 14px;
            border-radius: 12px;
            font-size: 0.75rem;
            font-weight: 600;
            background: rgba(26, 86, 219, 0.1);
            color: var(--color-primary);
            margin-bottom: var(--spacing-sm);
            width: fit-content;
        }
        .feature-card .feature-body h3 {
            font-size: 1.4rem;
            margin-bottom: var(--spacing-sm);
        }
        .feature-card .feature-body p {
            font-size: 0.95rem;
            margin-bottom: var(--spacing-md);
        }
        .feature-card .feature-body .btn {
            align-self: flex-start;
        }

        /* ===== 统计数字 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--spacing-lg);
            text-align: center;
        }
        .stat-item {
            padding: var(--spacing-xl) var(--spacing-md);
            background: var(--color-bg-alt);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            transition: all var(--transition);
        }
        .stat-item:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--color-primary);
            line-height: 1.2;
            margin-bottom: var(--spacing-xs);
        }
        .stat-number span {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--color-text-light);
        }
        .stat-label {
            font-size: 0.9rem;
            color: var(--color-text-secondary);
            font-weight: 500;
        }

        /* ===== 评测流程 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(5, 1fr);
            gap: var(--spacing-lg);
            position: relative;
        }
        .steps-grid::before {
            content: '';
            position: absolute;
            top: 48px;
            left: calc(10% + 24px);
            right: calc(10% + 24px);
            height: 2px;
            background: var(--color-border);
            z-index: 0;
        }
        .step-item {
            text-align: center;
            position: relative;
            z-index: 1;
            background: var(--color-bg);
            padding: 0 var(--spacing-sm);
        }
        .step-icon {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: var(--color-primary);
            color: var(--color-text-inverse);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            margin: 0 auto var(--spacing-md);
            box-shadow: 0 4px 16px rgba(26, 86, 219, 0.25);
            transition: all var(--transition);
        }
        .step-item:hover .step-icon {
            transform: scale(1.08);
            box-shadow: 0 6px 24px rgba(26, 86, 219, 0.35);
        }
        .step-item h4 {
            font-size: 1rem;
            margin-bottom: var(--spacing-xs);
        }
        .step-item p {
            font-size: 0.85rem;
            margin-bottom: 0;
            color: var(--color-text-light);
        }

        /* ===== 评价/引用 ===== */
        .testimonial-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--spacing-lg);
        }
        .testimonial-card {
            background: var(--color-bg-alt);
            border-radius: var(--radius-md);
            padding: var(--spacing-xl);
            border: 1px solid var(--color-border);
            position: relative;
            transition: all var(--transition);
        }
        .testimonial-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .testimonial-card::before {
            content: '\201C';
            font-size: 3rem;
            color: var(--color-primary-light);
            opacity: 0.2;
            position: absolute;
            top: var(--spacing-md);
            left: var(--spacing-lg);
            line-height: 1;
            font-family: Georgia, serif;
        }
        .testimonial-card p {
            font-size: 0.95rem;
            font-style: italic;
            margin-bottom: var(--spacing-md);
            padding-top: var(--spacing-md);
        }
        .testimonial-author {
            display: flex;
            align-items: center;
            gap: var(--spacing-md);
        }
        .testimonial-author .avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--color-border-light);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--color-text-light);
        }
        .testimonial-author .name {
            font-weight: 600;
            font-size: 0.9rem;
        }
        .testimonial-author .title {
            font-size: 0.8rem;
            color: var(--color-text-light);
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: var(--spacing-sm);
        }
        .faq-item {
            background: var(--color-bg-alt);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--color-primary-light);
        }
        .faq-question {
            padding: var(--spacing-lg);
            font-weight: 600;
            font-size: 1rem;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            gap: var(--spacing-md);
            color: var(--color-text);
            transition: color var(--transition);
            user-select: none;
        }
        .faq-question i {
            color: var(--color-text-light);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-question i {
            transform: rotate(180deg);
            color: var(--color-primary);
        }
        .faq-item.open .faq-question {
            color: var(--color-primary);
        }
        .faq-answer {
            padding: 0 var(--spacing-lg) var(--spacing-lg);
            display: none;
            font-size: 0.95rem;
            color: var(--color-text-secondary);
            line-height: 1.8;
        }
        .faq-item.open .faq-answer {
            display: block;
        }
        .faq-answer p:last-child {
            margin-bottom: 0;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
            border-radius: var(--radius-lg);
            padding: var(--spacing-2xl) var(--spacing-xl);
            text-align: center;
            color: var(--color-text-inverse);
            position: relative;
            overflow: hidden;
        }
        .cta-section::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -30%;
            width: 400px;
            height: 400px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.04);
            pointer-events: none;
        }
        .cta-section h2 {
            color: var(--color-text-inverse);
            font-size: 1.8rem;
            margin-bottom: var(--spacing-sm);
        }
        .cta-section p {
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto var(--spacing-lg);
            font-size: 1.05rem;
        }
        .cta-section .btn {
            background: var(--color-text-inverse);
            color: var(--color-primary);
            font-weight: 600;
            padding: var(--spacing-sm) var(--spacing-xl);
            border-radius: var(--radius-sm);
            font-size: 1rem;
            display: inline-flex;
            align-items: center;
            gap: var(--spacing-sm);
            transition: all var(--transition);
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
        }
        .cta-section .btn:hover {
            background: var(--color-secondary-light);
            color: var(--color-text);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.2);
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: var(--spacing-sm);
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: 1px solid transparent;
            text-align: center;
            justify-content: center;
        }
        .btn-primary {
            background: var(--color-primary);
            color: var(--color-text-inverse);
            border-color: var(--color-primary);
        }
        .btn-primary:hover {
            background: var(--color-primary-dark);
            color: var(--color-text-inverse);
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(26, 86, 219, 0.3);
        }
        .btn-outline {
            background: transparent;
            color: var(--color-primary);
            border-color: var(--color-primary);
        }
        .btn-outline:hover {
            background: var(--color-primary);
            color: var(--color-text-inverse);
        }
        .btn-sm {
            padding: 6px 16px;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 14px 32px;
            font-size: 1.05rem;
        }

        /* ===== 标签 ===== */
        .tags-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
            justify-content: center;
        }
        .tags-cloud a {
            display: inline-block;
            padding: var(--spacing-xs) var(--spacing-md);
            border-radius: 16px;
            font-size: 0.85rem;
            font-weight: 500;
            background: var(--color-border-light);
            color: var(--color-text-secondary);
            border: 1px solid var(--color-border);
            transition: all var(--transition);
        }
        .tags-cloud a:hover {
            background: var(--color-primary);
            color: var(--color-text-inverse);
            border-color: var(--color-primary);
            transform: translateY(-2px);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--color-bg-alt);
            border-top: 1px solid var(--color-border);
            padding: var(--spacing-2xl) 0 var(--spacing-lg);
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: var(--spacing-xl);
            margin-bottom: var(--spacing-xl);
        }
        .footer-brand .logo-text {
            font-size: 1.2rem;
            display: block;
            margin-bottom: var(--spacing-sm);
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--color-text-light);
            margin-bottom: 0;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: var(--spacing-md);
            color: var(--color-text);
        }
        .footer-col a {
            display: block;
            font-size: 0.88rem;
            color: var(--color-text-secondary);
            padding: var(--spacing-xs) 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--color-primary);
        }
        .footer-col a i {
            margin-right: var(--spacing-sm);
            width: 16px;
            text-align: center;
        }
        .footer-bottom {
            border-top: 1px solid var(--color-border-light);
            padding-top: var(--spacing-lg);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: var(--spacing-md);
            font-size: 0.82rem;
            color: var(--color-text-light);
        }
        .footer-bottom a {
            color: var(--color-text-secondary);
        }
        .footer-bottom a:hover {
            color: var(--color-primary);
        }

        /* ===== 移动端响应式 ===== */
        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-grid {
                grid-template-columns: repeat(3, 1fr);
            }
            .steps-grid::before {
                display: none;
            }
            .testimonial-grid {
                grid-template-columns: 1fr;
            }
            .feature-card {
                grid-template-columns: 1fr;
            }
            .feature-card .feature-image {
                aspect-ratio: 16 / 9;
            }
        }

        @media (max-width: 768px) {
            :root {
                --sidebar-width: 0px;
            }
            .sidebar {
                transform: translateX(-100%);
                width: 280px;
                box-shadow: var(--shadow-xl);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .menu-toggle {
                display: flex;
                align-items: center;
                gap: var(--spacing-sm);
            }
            .menu-overlay {
                display: block;
                pointer-events: none;
            }
            .menu-overlay.open {
                pointer-events: auto;
            }
            .main-wrapper {
                margin-left: 0;
            }
            .page-header .container {
                flex-direction: column;
                align-items: flex-start;
            }
            .page-header-right {
                width: 100%;
            }
            .tag-filter {
                width: 100%;
                overflow-x: auto;
                flex-wrap: nowrap;
                -webkit-overflow-scrolling: touch;
                padding-bottom: var(--spacing-xs);
            }
            .tag-filter a {
                flex-shrink: 0;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--spacing-sm);
            }
            .stat-item {
                padding: var(--spacing-lg) var(--spacing-sm);
            }
            .stat-number {
                font-size: 1.8rem;
            }
            .steps-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: var(--spacing-md);
            }
            .step-icon {
                width: 52px;
                height: 52px;
                font-size: 1.2rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: var(--spacing-lg);
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .section {
                padding: var(--spacing-xl) 0;
            }
            h1 {
                font-size: 1.6rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            .page-header-left h1 {
                font-size: 1.35rem;
            }
            .cta-section {
                padding: var(--spacing-xl) var(--spacing-lg);
            }
            .cta-section h2 {
                font-size: 1.4rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 var(--spacing-md);
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-sm);
            }
            .step-item {
                padding: var(--spacing-sm);
            }
            .step-icon {
                width: 44px;
                height: 44px;
                font-size: 1rem;
            }
            .feature-card .feature-body {
                padding: var(--spacing-lg);
            }
            .feature-card .feature-body h3 {
                font-size: 1.15rem;
            }
            .testimonial-card {
                padding: var(--spacing-lg);
            }
            .faq-question {
                padding: var(--spacing-md);
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 var(--spacing-md) var(--spacing-md);
                font-size: 0.88rem;
            }
            .page-header {
                padding: var(--spacing-lg) 0;
            }
            .menu-toggle {
                top: var(--spacing-sm);
                left: var(--spacing-sm);
                font-size: 1rem;
                padding: var(--spacing-xs) var(--spacing-sm);
            }
        }

        /* ===== 工具类 ===== */
        .text-center {
            text-align: center;
        }
        .mt-lg {
            margin-top: var(--spacing-lg);
        }
        .mb-lg {
            margin-bottom: var(--spacing-lg);
        }
        .gap-sm {
            gap: var(--spacing-sm);
        }
        .gap-md {
            gap: var(--spacing-md);
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f0f1a;
            --primary-light: #1a1a2e;
            --primary-mid: #2c3e7a;
            --accent: #ff6b35;
            --accent-hover: #e85d2c;
            --accent-light: #fff0ea;
            --success: #27ae60;
            --bg: #f4f5f7;
            --bg-card: #ffffff;
            --bg-dark: #0a0a14;
            --text: #1e1e2f;
            --text-light: #5a5a7a;
            --text-muted: #8a8aa0;
            --border: #e6e8ec;
            --radius: 10px;
            --radius-lg: 16px;
            --shadow: 0 2px 12px rgba(0, 0, 0, 0.05);
            --shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.10);
            --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.12);
            --transition: 0.25s ease;
            --sidebar-width: 220px;
            --header-height: 0px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            display: flex;
            min-height: 100vh;
        }
        a {
            color: var(--primary-mid);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }
        button,
        input,
        textarea,
        select {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
        }
        p {
            margin-bottom: 1rem;
            color: var(--text-light);
        }

        /* ===== 容器 ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-narrow {
            max-width: 860px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 左侧导航 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--primary);
            color: #fff;
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition);
            box-shadow: 2px 0 20px rgba(0, 0, 0, 0.2);
        }
        .sidebar-brand {
            padding: 28px 24px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .logo-text {
            font-size: 1.35rem;
            font-weight: 800;
            letter-spacing: 0.5px;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .logo-text span {
            color: var(--accent);
        }
        .sidebar-nav {
            padding: 16px 12px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1.2px;
            color: rgba(255, 255, 255, 0.35);
            padding: 12px 12px 8px;
            font-weight: 600;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius);
            color: rgba(255, 255, 255, 0.7);
            font-size: 0.94rem;
            font-weight: 500;
            transition: all var(--transition);
            text-decoration: none;
        }
        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
            color: rgba(255, 255, 255, 0.4);
            transition: color var(--transition);
        }
        .sidebar-nav a:hover {
            background: rgba(255, 255, 255, 0.08);
            color: #fff;
        }
        .sidebar-nav a:hover i {
            color: var(--accent);
        }
        .sidebar-nav a.active {
            background: var(--accent);
            color: #fff;
            font-weight: 600;
        }
        .sidebar-nav a.active i {
            color: #fff;
        }
        .sidebar-footer {
            padding: 16px 20px 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.75rem;
            color: rgba(255, 255, 255, 0.3);
            text-align: center;
        }

        /* ===== 主内容区 ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== 移动端汉堡按钮 ===== */
        .menu-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            background: var(--primary);
            color: #fff;
            border: none;
            width: 44px;
            height: 44px;
            border-radius: var(--radius);
            font-size: 1.3rem;
            cursor: pointer;
            box-shadow: var(--shadow-lg);
            transition: background var(--transition);
        }
        .menu-toggle:hover {
            background: var(--primary-light);
        }
        .menu-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 999;
            opacity: 0;
            transition: opacity var(--transition);
        }
        .menu-overlay.show {
            opacity: 1;
        }

        /* ===== Hero / Banner ===== */
        .article-hero {
            position: relative;
            padding: 80px 0 64px;
            background: var(--primary);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            color: #fff;
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 15, 26, 0.88) 0%, rgba(26, 26, 46, 0.70) 100%);
            z-index: 1;
        }
        .article-hero .container-narrow {
            position: relative;
            z-index: 2;
        }
        .article-hero .category-tag {
            display: inline-block;
            background: var(--accent);
            color: #fff;
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            margin-bottom: 20px;
            text-transform: uppercase;
        }
        .article-hero h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.25;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .article-hero .meta {
            display: flex;
            align-items: center;
            gap: 24px;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.7);
            flex-wrap: wrap;
        }
        .article-hero .meta i {
            margin-right: 6px;
            color: var(--accent);
        }
        .article-hero .meta span {
            display: flex;
            align-items: center;
        }

        /* ===== 文章正文 ===== */
        .article-body {
            padding: 48px 0 40px;
            background: var(--bg-card);
            border-radius: var(--radius-lg) var(--radius-lg) 0 0;
            margin-top: -32px;
            position: relative;
            z-index: 3;
            box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.04);
        }
        .article-body .featured-image {
            margin-bottom: 32px;
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .article-body .featured-image img {
            width: 100%;
            height: auto;
            max-height: 480px;
            object-fit: cover;
            border-radius: var(--radius-lg);
        }
        .article-body .content {
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--text);
        }
        .article-body .content p {
            margin-bottom: 1.4rem;
            color: var(--text-light);
        }
        .article-body .content h2,
        .article-body .content h3,
        .article-body .content h4 {
            margin-top: 2rem;
            margin-bottom: 0.8rem;
            font-weight: 700;
            color: var(--text);
        }
        .article-body .content h2 {
            font-size: 1.6rem;
        }
        .article-body .content h3 {
            font-size: 1.25rem;
        }
        .article-body .content img {
            border-radius: var(--radius);
            margin: 24px 0;
            box-shadow: var(--shadow);
        }
        .article-body .content ul,
        .article-body .content ol {
            margin-bottom: 1.4rem;
            padding-left: 1.6rem;
            color: var(--text-light);
        }
        .article-body .content ul li {
            list-style: disc;
            margin-bottom: 0.4rem;
        }
        .article-body .content ol li {
            list-style: decimal;
            margin-bottom: 0.4rem;
        }
        .article-body .content a {
            color: var(--primary-mid);
            border-bottom: 1px solid transparent;
            transition: border-color var(--transition);
        }
        .article-body .content a:hover {
            border-bottom-color: var(--accent);
            color: var(--accent);
        }
        .article-body .content blockquote {
            border-left: 4px solid var(--accent);
            background: var(--accent-light);
            padding: 16px 24px;
            margin: 24px 0;
            border-radius: 0 var(--radius) var(--radius) 0;
            color: var(--text-light);
            font-style: italic;
        }
        .article-body .content pre {
            background: var(--primary);
            color: #f0f0f0;
            padding: 20px 24px;
            border-radius: var(--radius);
            overflow-x: auto;
            font-family: var(--font-mono);
            font-size: 0.9rem;
            margin: 24px 0;
            line-height: 1.6;
        }
        .article-body .content code {
            font-family: var(--font-mono);
            background: #f0f0f5;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.88rem;
            color: var(--accent);
        }
        .article-body .content pre code {
            background: transparent;
            padding: 0;
            color: inherit;
        }

        /* ===== 文章标签 ===== */
        .article-tags {
            padding: 24px 0 8px;
            border-top: 1px solid var(--border);
            margin-top: 32px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 10px;
        }
        .article-tags .label {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-muted);
        }
        .article-tags .tag {
            display: inline-block;
            background: var(--bg);
            color: var(--text-light);
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 0.82rem;
            font-weight: 500;
            transition: all var(--transition);
            border: 1px solid var(--border);
        }
        .article-tags .tag:hover {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
        }
        .article-share {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 12px;
        }
        .article-share .label {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-muted);
        }
        .article-share a {
            display: flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--bg);
            color: var(--text-light);
            border: 1px solid var(--border);
            transition: all var(--transition);
            font-size: 1rem;
            text-decoration: none;
        }
        .article-share a:hover {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
            transform: translateY(-2px);
        }

        /* ===== 内容未找到 ===== */
        .not-found {
            text-align: center;
            padding: 80px 24px;
        }
        .not-found i {
            font-size: 4rem;
            color: var(--text-muted);
            margin-bottom: 24px;
            display: block;
        }
        .not-found h2 {
            font-size: 2rem;
            margin-bottom: 12px;
        }
        .not-found p {
            font-size: 1.1rem;
            color: var(--text-muted);
            margin-bottom: 24px;
        }
        .not-found .btn {
            display: inline-block;
        }

        /* ===== 相关文章 ===== */
        .related-section {
            padding: 60px 0 48px;
            background: var(--bg);
        }
        .related-section .section-title {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text);
        }
        .related-section .section-sub {
            font-size: 0.95rem;
            color: var(--text-muted);
            margin-bottom: 32px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: all var(--transition);
            border: 1px solid var(--border);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .related-card .card-img {
            width: 100%;
            height: 160px;
            object-fit: cover;
            border-radius: 0;
        }
        .related-card .card-body {
            padding: 16px 18px 18px;
        }
        .related-card .card-body .cat {
            font-size: 0.72rem;
            font-weight: 600;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 6px;
            display: block;
        }
        .related-card .card-body h3 {
            font-size: 0.95rem;
            font-weight: 600;
            line-height: 1.4;
            color: var(--text);
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body p {
            font-size: 0.82rem;
            color: var(--text-muted);
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            margin-bottom: 0;
        }
        .related-card .card-body .date {
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-top: 10px;
            display: block;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 56px 0;
            background: var(--primary);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(15, 15, 26, 0.85);
            z-index: 1;
        }
        .cta-section .container-narrow {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.7);
            margin-bottom: 28px;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-section .btn-group {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            cursor: pointer;
            text-decoration: none;
            border: none;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 4px 16px rgba(255, 107, 53, 0.35);
        }
        .btn-primary:hover {
            background: var(--accent-hover);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(255, 107, 53, 0.45);
        }
        .btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255, 255, 255, 0.3);
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: #fff;
            background: rgba(255, 107, 53, 0.15);
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 0.85rem;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 48px 0 24px;
            margin-top: auto;
        }
        .site-footer .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer-brand .logo-text {
            font-size: 1.25rem;
            margin-bottom: 12px;
        }
        .footer-brand p {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.55);
            line-height: 1.7;
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 0.85rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
            text-transform: uppercase;
        }
        .footer-col a {
            display: block;
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.55);
            padding: 4px 0;
            transition: color var(--transition);
            text-decoration: none;
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-col a i {
            margin-right: 8px;
            width: 16px;
            text-align: center;
            color: var(--accent);
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.35);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
            transition: color var(--transition);
            text-decoration: none;
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .article-hero h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .menu-toggle {
                display: flex;
                align-items: center;
                justify-content: center;
            }
            .menu-overlay.show {
                display: block;
            }
            .main-content {
                margin-left: 0;
            }
            .article-hero {
                padding: 64px 0 48px;
            }
            .article-hero h1 {
                font-size: 1.7rem;
            }
            .article-hero .meta {
                gap: 16px;
                font-size: 0.82rem;
                flex-direction: column;
                align-items: flex-start;
            }
            .article-body {
                padding: 32px 0 24px;
                margin-top: -24px;
            }
            .article-body .content {
                font-size: 1rem;
            }
            .article-body .content h2 {
                font-size: 1.35rem;
            }
            .related-grid {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .related-card .card-img {
                height: 180px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-section .btn-group {
                flex-direction: column;
                align-items: center;
            }
            .not-found {
                padding: 48px 16px;
            }
            .not-found i {
                font-size: 3rem;
            }
            .not-found h2 {
                font-size: 1.5rem;
            }
        }

        @media (max-width: 520px) {
            .article-hero h1 {
                font-size: 1.4rem;
            }
            .article-hero .category-tag {
                font-size: 0.7rem;
                padding: 2px 12px;
            }
            .article-body .content {
                font-size: 0.95rem;
            }
            .article-body .content h2 {
                font-size: 1.2rem;
            }
            .article-tags {
                flex-direction: column;
                align-items: flex-start;
            }
            .article-share {
                flex-wrap: wrap;
            }
            .container {
                padding: 0 16px;
            }
            .container-narrow {
                padding: 0 16px;
            }
            .btn {
                padding: 10px 22px;
                font-size: 0.88rem;
            }
            .related-card .card-body {
                padding: 14px 16px;
            }
            .cta-section {
                padding: 40px 0;
            }
            .site-footer {
                padding: 32px 0 16px;
            }
        }

        /* ===== 实用辅助 ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mb-16 {
            margin-bottom: 16px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .gap-8 {
            gap: 8px;
        }
        .gap-12 {
            gap: 12px;
        }
        .flex {
            display: flex;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }
        .items-center {
            align-items: center;
        }