/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a56db;
            --primary-dark: #1243af;
            --primary-light: #e8effd;
            --secondary: #f59e0b;
            --secondary-dark: #d48a08;
            --accent: #0ea5e9;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f172a;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.06);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.14);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== 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(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        button, input, textarea { font-family: inherit; font-size: 1rem; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
        h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
        h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); }
        h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }
        p { margin-bottom: 1em; }

        /* ===== Container ===== */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 640px) {
            .container { padding: 0 16px; }
        }

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            height: var(--header-h);
            display: flex;
            align-items: center;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.02em;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .logo i { font-size: 1.5rem; color: var(--secondary); }
        .logo:hover { color: var(--primary-dark); }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-list a {
            display: inline-flex;
            align-items: center;
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-weight: 500;
            font-size: 0.95rem;
            color: var(--text);
            transition: var(--transition);
            position: relative;
        }
        .nav-list a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .nav-list a.active {
            background: var(--primary);
            color: #fff;
        }
        .nav-list a.active:hover {
            background: var(--primary-dark);
            color: #fff;
        }
        .nav-cta {
            background: var(--secondary) !important;
            color: #fff !important;
            padding: 8px 24px !important;
            border-radius: var(--radius-sm) !important;
            font-weight: 600 !important;
        }
        .nav-cta:hover {
            background: var(--secondary-dark) !important;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 8px 12px;
            font-size: 1.4rem;
            color: var(--text);
            cursor: pointer;
            transition: var(--transition);
        }
        .nav-toggle:hover { border-color: var(--primary); color: var(--primary); }
        @media (max-width: 768px) {
            .nav-toggle { display: block; }
            .nav-list {
                position: absolute;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 16px 24px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-md);
                display: none;
                gap: 2px;
            }
            .nav-list.open { display: flex; }
            .nav-list a { width: 100%; padding: 12px 16px; }
            .nav-cta { text-align: center; }
        }

        /* ===== Hero ===== */
        .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 center;
            background-repeat: no-repeat;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.82) 0%, rgba(26,86,219,0.52) 100%);
            z-index: 1;
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 720px;
            padding: 60px 0;
            color: #fff;
        }
        .hero-content h1 {
            color: #fff;
            margin-bottom: 20px;
            font-weight: 800;
            letter-spacing: -0.02em;
            text-shadow: 0 2px 12px rgba(0,0,0,0.2);
        }
        .hero-content p {
            font-size: 1.15rem;
            line-height: 1.8;
            color: rgba(255,255,255,0.85);
            margin-bottom: 32px;
            max-width: 580px;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
            line-height: 1.2;
        }
        .btn-primary {
            background: var(--secondary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--secondary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255,255,255,0.6);
        }
        .btn-outline:hover {
            background: rgba(255,255,255,0.12);
            border-color: #fff;
            transform: translateY(-2px);
            color: #fff;
        }
        .btn-lg { padding: 16px 40px; font-size: 1.1rem; }
        @media (max-width: 640px) {
            .hero { min-height: 400px; }
            .hero-content { padding: 40px 0; }
            .hero-actions { flex-direction: column; align-items: stretch; }
            .btn { justify-content: center; }
        }

        /* ===== Section Common ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt { background: var(--bg-white); }
        .section-dark { background: var(--bg-dark); color: var(--text-white); }
        .section-dark h2, .section-dark h3 { color: #fff; }
        .section-header {
            text-align: center;
            max-width: 680px;
            margin: 0 auto 48px;
        }
        .section-header h2 { margin-bottom: 12px; }
        .section-header p {
            color: var(--text-light);
            font-size: 1.1rem;
        }
        .section-dark .section-header p { color: rgba(255,255,255,0.7); }
        .section-sm { padding: 48px 0; }
        @media (max-width: 768px) {
            .section { padding: 48px 0; }
            .section-header { margin-bottom: 32px; }
        }

        /* ===== Grid / Cards ===== */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        @media (max-width: 1024px) {
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .grid-3 { grid-template-columns: repeat(2, 1fr); }
            .grid-2 { grid-template-columns: 1fr; }
        }
        @media (max-width: 520px) {
            .grid-3, .grid-4 { grid-template-columns: 1fr; }
        }

        .card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border);
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
        }
        .card-body {
            padding: 20px 24px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .card-body h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }
        .card-body p {
            color: var(--text-light);
            font-size: 0.95rem;
            margin-bottom: 16px;
            flex: 1;
        }
        .card-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.85rem;
            color: var(--text-light);
            margin-top: auto;
        }
        .card-meta i { margin-right: 4px; }
        .card-tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 20px;
            margin-bottom: 12px;
            align-self: flex-start;
        }
        .card-link {
            text-decoration: none;
            color: inherit;
            display: flex;
            flex-direction: column;
            flex: 1;
        }
        .card-link:hover { color: inherit; }

        /* ===== Badge / Tag ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            background: var(--primary-light);
            color: var(--primary);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 20px;
        }
        .badge-secondary {
            background: rgba(245,158,11,0.12);
            color: var(--secondary-dark);
        }

        /* ===== Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 28px;
            text-align: center;
        }
        .stat-item h3 {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 4px;
        }
        .stat-item p { color: var(--text-light); font-size: 0.95rem; margin: 0; }
        .section-dark .stat-item h3 { color: var(--secondary); }
        .section-dark .stat-item p { color: rgba(255,255,255,0.7); }
        @media (max-width: 768px) {
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
        }
        @media (max-width: 520px) {
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
            .stat-item h3 { font-size: 1.8rem; }
        }

        /* ===== Steps / Flow ===== */
        .flow-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .flow-step {
            text-align: center;
            position: relative;
            padding: 32px 16px;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .flow-step:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
        .flow-step::before {
            counter-increment: step;
            content: "0" counter(step);
            position: absolute;
            top: 12px;
            left: 16px;
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--border);
            line-height: 1;
        }
        .flow-step .icon {
            font-size: 2.4rem;
            color: var(--primary);
            margin-bottom: 16px;
            display: block;
        }
        .flow-step h4 { font-size: 1.1rem; margin-bottom: 6px; }
        .flow-step p { font-size: 0.9rem; color: var(--text-light); margin: 0; }
        @media (max-width: 768px) {
            .flow-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .flow-grid { grid-template-columns: 1fr; }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-white);
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: var(--primary); }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 24px;
            font-weight: 600;
            font-size: 1.05rem;
            cursor: pointer;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            color: var(--text);
            transition: var(--transition);
            gap: 12px;
        }
        .faq-question i { font-size: 1.1rem; color: var(--primary); transition: var(--transition); }
        .faq-question[aria-expanded="true"] i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px 20px;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.7;
            display: none;
        }
        .faq-answer.open { display: block; }
        .section-dark .faq-item { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.1); }
        .section-dark .faq-question { color: #fff; }
        .section-dark .faq-answer { color: rgba(255,255,255,0.75); }

        /* ===== CTA ===== */
        .cta-box {
            background: var(--primary);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            border-radius: var(--radius-lg);
            padding: 64px 48px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-box::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(26,86,219,0.82);
            z-index: 1;
        }
        .cta-box > * { position: relative; z-index: 2; }
        .cta-box h2 { color: #fff; margin-bottom: 12px; }
        .cta-box p { color: rgba(255,255,255,0.85); max-width: 560px; margin: 0 auto 28px; font-size: 1.05rem; }
        .cta-box .btn-primary { background: #fff; color: var(--primary); }
        .cta-box .btn-primary:hover { background: var(--border); color: var(--primary-dark); }
        @media (max-width: 640px) {
            .cta-box { padding: 40px 20px; }
        }

        /* ===== Posts List ===== */
        .post-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .post-item {
            display: flex;
            gap: 20px;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            border: 1px solid var(--border);
            transition: var(--transition);
            align-items: flex-start;
        }
        .post-item:hover { box-shadow: var(--shadow-md); border-color: var(--primary); }
        .post-thumb {
            width: 120px;
            height: 84px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
        }
        .post-info { flex: 1; }
        .post-info h4 { font-size: 1.05rem; margin-bottom: 4px; }
        .post-info p { font-size: 0.9rem; color: var(--text-light); margin-bottom: 8px; }
        .post-meta {
            display: flex;
            gap: 16px;
            font-size: 0.82rem;
            color: var(--text-light);
        }
        .post-meta i { margin-right: 4px; }
        .post-empty {
            text-align: center;
            padding: 48px 24px;
            color: var(--text-light);
            background: var(--bg-white);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border);
        }
        @media (max-width: 640px) {
            .post-item { flex-direction: column; padding: 16px; }
            .post-thumb { width: 100%; height: auto; aspect-ratio: 16/9; }
        }

        /* ===== Category Hero (inner) ===== */
        .cat-hero {
            position: relative;
            min-height: 280px;
            display: flex;
            align-items: center;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
        }
        .cat-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,23,42,0.80) 0%, rgba(26,86,219,0.50) 100%);
            z-index: 1;
        }
        .cat-hero-content {
            position: relative;
            z-index: 2;
            color: #fff;
            padding: 40px 0;
        }
        .cat-hero-content h1 { color: #fff; margin-bottom: 8px; }
        .cat-hero-content p { color: rgba(255,255,255,0.8); font-size: 1.1rem; max-width: 600px; }

        /* ===== Article ===== */
        .article-wrap {
            max-width: 820px;
            margin: 0 auto;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 48px 56px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }
        .article-wrap h1 {
            font-size: 2rem;
            margin-bottom: 16px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 0.9rem;
            color: var(--text-light);
            margin-bottom: 32px;
            padding-bottom: 20px;
            border-bottom: 1px solid var(--border);
        }
        .article-meta i { margin-right: 4px; }
        .article-body {
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--text);
        }
        .article-body p { margin-bottom: 1.4em; }
        .article-body img { border-radius: var(--radius-md); margin: 24px 0; }
        .article-body h2, .article-body h3 { margin-top: 36px; margin-bottom: 12px; }
        .article-notfound {
            text-align: center;
            padding: 80px 24px;
        }
        .article-notfound h2 { margin-bottom: 12px; }
        .article-notfound p { color: var(--text-light); margin-bottom: 24px; }
        @media (max-width: 768px) {
            .article-wrap { padding: 24px 20px; }
            .article-wrap h1 { font-size: 1.5rem; }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.7);
            padding: 48px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 32px;
        }
        .footer-brand .logo { color: #fff; margin-bottom: 12px; }
        .footer-brand p { font-size: 0.9rem; max-width: 300px; margin: 0; }
        .footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: rgba(255,255,255,0.6); font-size: 0.9rem; }
        .footer-col ul li a:hover { color: var(--secondary); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: var(--secondary); }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .footer-brand { grid-column: 1 / -1; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== Utilities ===== */
        .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; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

        /* ===== Focus ===== */
        a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
            outline: 3px solid var(--primary);
            outline-offset: 2px;
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar { width: 8px; }
        ::-webkit-scrollbar-track { background: var(--bg); }
        ::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
        ::-webkit-scrollbar-thumb:hover { background: var(--text-light); }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-bg: #eff6ff;
            --secondary: #0f172a;
            --secondary-light: #1e293b;
            --accent: #f59e0b;
            --accent-light: #fbbf24;
            --success: #10b981;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text: #0f172a;
            --text-light: #475569;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 16px;
            --shadow: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-lg: 0 12px 48px rgba(0,0,0,0.10);
            --shadow-hover: 0 12px 40px rgba(37,99,235,0.15);
            --transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --container: 1200px;
            --header-h: 72px;
        }

        /* ===== 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);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-h);
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-dark); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
        h1 { font-size: 2.5rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.35rem; }
        h4 { font-size: 1.1rem; }
        p { margin-bottom: 1rem; color: var(--text-light); }
        .container {
            width: 100%;
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-h);
            background: rgba(255,255,255,0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            z-index: 1000;
            transition: var(--transition);
        }
        .site-header.scrolled { box-shadow: var(--shadow); }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text);
            letter-spacing: -0.3px;
        }
        .logo i { color: var(--primary); font-size: 1.5rem; }
        .logo:hover { color: var(--primary); }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-list a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-light);
            transition: var(--transition);
            position: relative;
        }
        .nav-list a:hover { color: var(--primary); background: var(--primary-bg); }
        .nav-list a.active {
            color: var(--primary);
            background: var(--primary-bg);
            font-weight: 600;
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 3px;
            background: var(--primary);
        }
        .nav-list a.nav-cta {
            background: var(--primary);
            color: #fff;
            padding: 10px 24px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 8px;
            margin-left: 8px;
        }
        .nav-list a.nav-cta:hover { background: var(--primary-dark); color: #fff; transform: translateY(-1px); box-shadow: 0 6px 20px rgba(37,99,235,0.30); }
        .nav-toggle { display: none; background: none; border: none; font-size: 1.5rem; color: var(--text); cursor: pointer; padding: 8px; border-radius: var(--radius-sm); }

        /* ===== Hero / Banner (分类页内页小横幅) ===== */
        .page-banner {
            position: relative;
            padding: 80px 0 64px;
            background: linear-gradient(135deg, #1e3a5f 0%, #0f172a 100%);
            overflow: hidden;
            min-height: 280px;
            display: flex;
            align-items: center;
        }
        .page-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.20;
            mix-blend-mode: overlay;
        }
        .page-banner .container { position: relative; z-index: 2; }
        .page-banner h1 {
            color: #fff;
            font-size: 2.6rem;
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }
        .page-banner p {
            color: rgba(255,255,255,0.85);
            font-size: 1.15rem;
            max-width: 680px;
            margin-bottom: 0;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 6px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.6);
            margin-bottom: 20px;
        }
        .breadcrumb a { color: rgba(255,255,255,0.7); }
        .breadcrumb a:hover { color: #fff; }
        .breadcrumb i { font-size: 0.7rem; color: rgba(255,255,255,0.4); }

        /* ===== Section Shared ===== */
        .section {
            padding: 72px 0;
        }
        .section-alt { background: var(--bg-alt); }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 2rem;
            margin-bottom: 12px;
            position: relative;
            display: inline-block;
        }
        .section-title h2::after {
            content: '';
            display: block;
            width: 48px;
            height: 4px;
            background: var(--primary);
            border-radius: 4px;
            margin: 12px auto 0;
        }
        .section-title p {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 600px;
            margin: 0 auto;
        }

        /* ===== Cards Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: var(--primary-light); }
        .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
            background: var(--bg-alt);
        }
        .card-body { padding: 24px; }
        .card-body h3 { font-size: 1.15rem; margin-bottom: 8px; }
        .card-body p { font-size: 0.92rem; color: var(--text-light); margin-bottom: 16px; }
        .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 0.82rem;
            color: var(--text-muted);
            border-top: 1px solid var(--border-light);
            padding-top: 14px;
        }
        .card-tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 20px;
            font-size: 0.75rem;
            font-weight: 600;
            background: var(--primary-bg);
            color: var(--primary);
        }
        .card-tag.accent { background: #fef3c7; color: #b45309; }
        .card-tag.success { background: #d1fae5; color: #065f46; }

        /* ===== Feature Blocks ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 32px;
        }
        .feature-item {
            display: flex;
            gap: 20px;
            padding: 28px;
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .feature-item:hover { border-color: var(--primary-light); box-shadow: var(--shadow); }
        .feature-icon {
            flex: 0 0 52px;
            width: 52px;
            height: 52px;
            border-radius: var(--radius-sm);
            background: var(--primary-bg);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
        }
        .feature-item h4 { font-size: 1.05rem; margin-bottom: 6px; }
        .feature-item p { font-size: 0.9rem; margin-bottom: 0; }

        /* ===== Step / Flow ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 32px 24px;
            text-align: center;
            border: 1px solid var(--border);
            position: relative;
            transition: var(--transition);
        }
        .step-card:hover { border-color: var(--primary-light); box-shadow: var(--shadow); }
        .step-card::before {
            counter-increment: step;
            content: counter(step);
            position: absolute;
            top: -12px;
            left: 50%;
            transform: translateX(-50%);
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-weight: 700;
            font-size: 0.85rem;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 12px rgba(37,99,235,0.30);
        }
        .step-card i { font-size: 2.2rem; color: var(--primary); margin-bottom: 16px; margin-top: 8px; }
        .step-card h4 { font-size: 1rem; margin-bottom: 8px; }
        .step-card p { font-size: 0.85rem; margin-bottom: 0; color: var(--text-muted); }

        /* ===== List / FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-light); }
        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            color: var(--text);
            transition: var(--transition);
        }
        .faq-question:hover { color: var(--primary); }
        .faq-question i { transition: var(--transition); font-size: 0.85rem; color: var(--text-muted); }
        .faq-item.active .faq-question i { transform: rotate(180deg); color: var(--primary); }
        .faq-answer {
            padding: 0 24px 18px;
            font-size: 0.92rem;
            color: var(--text-light);
            display: none;
        }
        .faq-item.active .faq-answer { display: block; }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            border-radius: var(--radius-lg);
            padding: 56px 48px;
            text-align: center;
            color: #fff;
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center/cover no-repeat;
            opacity: 0.08;
            mix-blend-mode: overlay;
        }
        .cta-block h2 { color: #fff; font-size: 2rem; margin-bottom: 12px; }
        .cta-block p { color: rgba(255,255,255,0.85); margin-bottom: 28px; font-size: 1.05rem; max-width: 600px; margin-left: auto; margin-right: auto; }
        .cta-block .btn { background: #fff; color: var(--primary); padding: 14px 36px; font-size: 1.05rem; font-weight: 700; border-radius: var(--radius-sm); display: inline-flex; align-items: center; gap: 10px; }
        .cta-block .btn:hover { background: var(--accent-light); color: var(--secondary); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(0,0,0,0.20); }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
            justify-content: center;
        }
        .btn-primary { background: var(--primary); color: #fff; }
        .btn-primary:hover { background: var(--primary-dark); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.30); }
        .btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
        .btn-outline:hover { background: var(--primary); color: #fff; }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--secondary);
            color: rgba(255,255,255,0.7);
            padding: 56px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo { color: #fff; font-size: 1.3rem; margin-bottom: 16px; }
        .footer-brand .logo i { color: var(--primary-light); }
        .footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.6); line-height: 1.7; }
        .footer-col h4 { color: #fff; font-size: 0.95rem; margin-bottom: 18px; font-weight: 600; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: rgba(255,255,255,0.6); font-size: 0.88rem; display: inline-flex; align-items: center; gap: 8px; }
        .footer-col ul li a:hover { color: #fff; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding: 20px 0;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.82rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: #fff; }

        /* ===== Count / Stats ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 32px 20px;
            text-align: center;
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .stat-card:hover { border-color: var(--primary-light); box-shadow: var(--shadow); }
        .stat-number {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 6px;
        }
        .stat-label { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 0; }

        /* ===== Info Tabs / Category Subnav ===== */
        .subnav-tabs {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-bottom: 40px;
            justify-content: center;
        }
        .subnav-tabs a {
            padding: 8px 22px;
            border-radius: 30px;
            font-size: 0.88rem;
            font-weight: 500;
            color: var(--text-light);
            background: var(--bg-card);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .subnav-tabs a:hover { border-color: var(--primary-light); color: var(--primary); }
        .subnav-tabs a.active { background: var(--primary); color: #fff; border-color: var(--primary); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .card-grid { grid-template-columns: repeat(2, 1fr); }
            .steps-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .feature-grid { grid-template-columns: 1fr; }
            .page-banner h1 { font-size: 2.2rem; }
        }
        @media (max-width: 768px) {
            body { padding-top: 64px; }
            :root { --header-h: 64px; }
            .nav-list {
                position: fixed;
                top: var(--header-h);
                left: 0;
                width: 100%;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                -webkit-backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border);
                display: none;
                box-shadow: var(--shadow-lg);
            }
            .nav-list.open { display: flex; }
            .nav-list a { width: 100%; text-align: center; padding: 12px 18px; }
            .nav-list a.nav-cta { margin-left: 0; justify-content: center; }
            .nav-toggle { display: block; }
            .page-banner { padding: 60px 0 48px; min-height: 220px; }
            .page-banner h1 { font-size: 1.8rem; }
            .page-banner p { font-size: 1rem; }
            .section { padding: 48px 0; }
            .section-title h2 { font-size: 1.6rem; }
            .card-grid { grid-template-columns: 1fr; }
            .steps-grid { grid-template-columns: 1fr; gap: 20px; }
            .stats-grid { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .cta-block { padding: 40px 24px; }
            .cta-block h2 { font-size: 1.5rem; }
            .feature-item { flex-direction: column; align-items: flex-start; }
            .subnav-tabs { flex-wrap: nowrap; overflow-x: auto; -webkit-overflow-scrolling: touch; padding-bottom: 8px; }
            .subnav-tabs a { white-space: nowrap; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .page-banner h1 { font-size: 1.5rem; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
            .stat-number { font-size: 1.8rem; }
            .footer-bottom { flex-direction: column; align-items: center; text-align: center; }
        }

        /* ===== Accessibility ===== */
        a:focus-visible, button:focus-visible, input:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: 4px; }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-8 { margin-top: 32px; }
        .mb-8 { margin-bottom: 32px; }
        .gap-4 { gap: 16px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .hidden { display: none; }

        /* ===== Skeleton / Placeholder Loading (optional) ===== */
        .skeleton { background: linear-gradient(90deg, var(--border-light) 25%, #eaeef3 50%, var(--border-light) 75%); background-size: 200% 100%; animation: skeleton-pulse 1.5s infinite; border-radius: var(--radius-sm); }
        @keyframes skeleton-pulse { 0% { background-position: 200% 0; } 100% { background-position: -200% 0; } }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #3b82f6;
            --primary-bg: #eff6ff;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text: #0f172a;
            --text-secondary: #475569;
            --text-weak: #94a3b8;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-hover: 0 12px 40px rgba(0,0,0,0.10);
            --shadow-nav: 0 2px 20px rgba(0,0,0,0.05);
            --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
            --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
        }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        ul, ol { list-style: none; padding-left: 0; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
        h1 { font-size: 2.25rem; }
        h2 { font-size: 1.75rem; }
        h3 { font-size: 1.25rem; }
        p { margin-bottom: 1em; color: var(--text-secondary); }
        .container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
        .container-narrow { max-width: 860px; margin: 0 auto; padding: 0 24px; }
        section { padding: 80px 0; }
        .section-title { text-align: center; margin-bottom: 16px; font-size: 2rem; }
        .section-sub { text-align: center; color: var(--text-secondary); max-width: 640px; margin: 0 auto 48px; font-size: 1.1rem; }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: sticky; top: 0; z-index: 100;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow-nav);
            height: var(--header-h);
        }
        .header-inner {
            display: flex; align-items: center; justify-content: space-between;
            height: var(--header-h);
        }
        .logo {
            display: flex; align-items: center; gap: 10px;
            font-size: 1.35rem; font-weight: 800;
            color: var(--text); letter-spacing: -0.5px;
        }
        .logo i { color: var(--primary); font-size: 1.6rem; }
        .logo:hover { color: var(--primary); }
        .nav-list { display: flex; align-items: center; gap: 8px; }
        .nav-list a {
            display: inline-flex; align-items: center; gap: 6px;
            padding: 8px 18px; border-radius: var(--radius-sm);
            font-size: 0.95rem; font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
        }
        .nav-list a:hover { color: var(--primary); background: var(--primary-bg); }
        .nav-list a.active { color: var(--primary); background: var(--primary-bg); font-weight: 600; }
        .nav-list a.nav-cta {
            background: var(--primary);
            color: #fff !important;
            padding: 10px 24px;
            border-radius: var(--radius);
            font-weight: 600;
            box-shadow: 0 4px 14px rgba(37,99,235,0.3);
        }
        .nav-list a.nav-cta:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(37,99,235,0.35);
        }
        .nav-toggle { display: none; background: none; border: none; font-size: 1.6rem; color: var(--text); cursor: pointer; padding: 4px; }

        /* ===== Article Hero ===== */
        .article-hero {
            position: relative;
            padding: 100px 0 80px;
            background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
            overflow: hidden;
        }
        .article-hero::before {
            content: '';
            position: absolute; inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.18;
            mix-blend-mode: overlay;
        }
        .article-hero .container-narrow { position: relative; z-index: 1; }
        .article-hero .breadcrumb {
            display: flex; align-items: center; gap: 8px;
            color: rgba(255,255,255,0.6);
            font-size: 0.9rem;
            margin-bottom: 20px;
        }
        .article-hero .breadcrumb a { color: rgba(255,255,255,0.7); }
        .article-hero .breadcrumb a:hover { color: #fff; }
        .article-hero .breadcrumb span { color: rgba(255,255,255,0.9); }
        .article-hero h1 {
            color: #fff;
            font-size: 2.6rem;
            line-height: 1.25;
            margin-bottom: 16px;
            text-shadow: 0 2px 12px rgba(0,0,0,0.2);
        }
        .article-hero .meta {
            display: flex; flex-wrap: wrap; gap: 20px;
            color: rgba(255,255,255,0.7);
            font-size: 0.95rem;
        }
        .article-hero .meta i { margin-right: 6px; }
        .article-hero .meta .tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            background: var(--primary);
            color: #fff;
            font-size: 0.85rem;
            font-weight: 500;
        }

        /* ===== Article Content ===== */
        .article-body {
            padding: 60px 0 80px;
            background: var(--bg);
        }
        .article-body .content {
            font-size: 1.05rem;
            line-height: 1.9;
            color: var(--text);
        }
        .article-body .content p { margin-bottom: 1.4em; }
        .article-body .content h2, .article-body .content h3 { margin-top: 2em; margin-bottom: 0.8em; }
        .article-body .content img { border-radius: var(--radius); margin: 1.8em 0; box-shadow: var(--shadow); }
        .article-body .content ul, .article-body .content ol { padding-left: 1.6em; margin-bottom: 1.4em; }
        .article-body .content li { margin-bottom: 0.5em; color: var(--text-secondary); list-style: disc; }
        .article-body .content blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-bg);
            padding: 20px 28px;
            margin: 1.8em 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
        }
        .article-body .content a { font-weight: 500; }
        .article-extra {
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid var(--border);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
        }
        .article-extra .btn-back {
            display: inline-flex; align-items: center; gap: 8px;
            padding: 12px 28px;
            background: var(--primary-bg);
            color: var(--primary);
            border-radius: var(--radius);
            font-weight: 600;
            transition: all var(--transition);
        }
        .article-extra .btn-back:hover { background: var(--primary); color: #fff; transform: translateX(-4px); }
        .article-extra .share { display: flex; align-items: center; gap: 12px; color: var(--text-secondary); font-size: 0.95rem; }
        .article-extra .share a {
            display: inline-flex; align-items: center; justify-content: center;
            width: 40px; height: 40px;
            border-radius: 50%;
            background: var(--bg-alt);
            color: var(--text-secondary);
            transition: all var(--transition);
        }
        .article-extra .share a:hover { background: var(--primary); color: #fff; }

        /* ===== Related / Recommended ===== */
        .related-section {
            background: var(--bg-alt);
            padding: 70px 0;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 24px;
            margin-top: 40px;
        }
        .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(-6px); box-shadow: var(--shadow-hover); }
        .related-card img { width: 100%; height: 180px; object-fit: cover; border-radius: 0; }
        .related-card .card-body { padding: 20px; }
        .related-card .card-body h3 { font-size: 1.1rem; margin-bottom: 8px; }
        .related-card .card-body h3 a { color: var(--text); }
        .related-card .card-body h3 a:hover { color: var(--primary); }
        .related-card .card-body p { font-size: 0.92rem; color: var(--text-secondary); margin-bottom: 0; }
        .related-card .card-body .meta { font-size: 0.85rem; color: var(--text-weak); margin-top: 12px; display: flex; gap: 12px; }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 100px 24px;
            background: var(--bg-alt);
            border-radius: var(--radius-lg);
        }
        .not-found-box i { font-size: 4rem; color: var(--text-weak); margin-bottom: 24px; display: block; }
        .not-found-box h2 { font-size: 1.8rem; margin-bottom: 12px; }
        .not-found-box p { color: var(--text-secondary); max-width: 480px; margin: 0 auto 28px; }
        .not-found-box .btn-home {
            display: inline-flex; align-items: center; gap: 8px;
            padding: 14px 36px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius);
            font-weight: 600;
            transition: all var(--transition);
        }
        .not-found-box .btn-home:hover { background: var(--primary-dark); transform: translateY(-2px); }

        /* ===== Footer ===== */
        .site-footer {
            background: #0f172a;
            color: rgba(255,255,255,0.7);
            padding: 60px 0 30px;
        }
        .site-footer .logo { color: #fff; margin-bottom: 12px; }
        .site-footer .logo i { color: var(--primary-light); }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand p { color: rgba(255,255,255,0.55); font-size: 0.95rem; max-width: 320px; }
        .footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; font-weight: 600; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul a { color: rgba(255,255,255,0.55); font-size: 0.92rem; transition: all var(--transition); display: inline-flex; align-items: center; gap: 8px; }
        .footer-col ul a:hover { color: #fff; padding-left: 4px; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: #fff; }

        /* ===== Buttons ===== */
        .btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 28px; border-radius: var(--radius); font-weight: 600; border: none; cursor: pointer; transition: all var(--transition); font-size: 1rem; }
        .btn-primary { background: var(--primary); color: #fff; box-shadow: 0 4px 14px rgba(37,99,235,0.25); }
        .btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 28px rgba(37,99,235,0.35); color: #fff; }
        .btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
        .btn-outline:hover { background: var(--primary); color: #fff; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }
        @media (max-width: 768px) {
            .nav-list { display: none; }
            .nav-list.open { display: flex; flex-direction: column; position: absolute; top: var(--header-h); left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); padding: 16px 24px; box-shadow: var(--shadow); }
            .nav-toggle { display: block; }
            .article-hero h1 { font-size: 1.8rem; }
            .article-hero { padding: 70px 0 60px; }
            .article-body .content { font-size: 1rem; }
            .related-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; align-items: flex-start; }
            section { padding: 60px 0; }
            .section-title { font-size: 1.6rem; }
        }
        @media (max-width: 520px) {
            .header-inner { padding: 0 16px; }
            .container { padding: 0 16px; }
            .container-narrow { padding: 0 16px; }
            .article-hero h1 { font-size: 1.5rem; }
            .article-hero .meta { flex-direction: column; gap: 8px; }
            .article-extra { flex-direction: column; align-items: flex-start; }
        }