/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #c9a84c;
            --primary-dark: #b8922e;
            --primary-light: #e8d5a3;
            --bg-deep: #0b0f1a;
            --bg-card: #151d30;
            --bg-card-hover: #1c2640;
            --bg-sidebar: #0d1321;
            --bg-section-alt: #101624;
            --text-primary: #f0ece4;
            --text-secondary: #b8b2a8;
            --text-muted: #6a6f82;
            --border-subtle: #1e2840;
            --border-active: #c9a84c;
            --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
            --shadow-hover: 0 12px 48px rgba(0,0,0,0.6);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --spacing-xs: 0.5rem;
            --spacing-sm: 1rem;
            --spacing-md: 2rem;
            --spacing-lg: 4rem;
            --spacing-xl: 6rem;
            --font-sans: 'PingFang SC','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;
            --transition: 0.35s cubic-bezier(0.25,0.46,0.45,0.94);
            --sidebar-width: 260px;
        }

        /* ===== 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-sans);
            background: var(--bg-deep);
            color: var(--text-primary);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-light); }
        a:focus-visible { outline: 2px solid var(--primary); outline-offset: 4px; border-radius: 4px; }
        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 { font-weight: 700; line-height: 1.3; color: var(--text-primary); }
        h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); }
        h2 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); }
        h3 { font-size: clamp(1.3rem, 2.5vw, 1.8rem); }
        h4 { font-size: clamp(1.1rem, 2vw, 1.4rem); }
        p { margin-bottom: 1rem; color: var(--text-secondary); }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 var(--spacing-md); }

        /* ===== App Shell Layout ===== */
        .app-shell { display: flex; min-height: 100vh; }

        /* ===== Sidebar ===== */
        .sidebar {
            width: var(--sidebar-width);
            background: var(--bg-sidebar);
            border-right: 1px solid var(--border-subtle);
            display: flex;
            flex-direction: column;
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 1000;
            padding: var(--spacing-md) 0;
            transition: transform var(--transition);
        }
        .sidebar-brand {
            padding: 0 var(--spacing-md) var(--spacing-lg);
            border-bottom: 1px solid var(--border-subtle);
            margin-bottom: var(--spacing-md);
        }
        .sidebar-brand .logo {
            font-size: 1.25rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: 1px;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .sidebar-brand .logo i { font-size: 1.5rem; color: var(--primary-light); }
        .sidebar-brand .logo-sub {
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-top: 0.25rem;
            letter-spacing: 2px;
            text-transform: uppercase;
        }
        .sidebar-nav { flex: 1; padding: 0 var(--spacing-sm); }
        .sidebar-nav .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 2px;
            color: var(--text-muted);
            padding: 0 var(--spacing-sm) var(--spacing-xs);
            margin-top: var(--spacing-sm);
        }
        .sidebar-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.7rem var(--spacing-sm);
            border-radius: var(--radius-sm);
            color: var(--text-secondary);
            transition: all var(--transition);
            margin-bottom: 2px;
            font-weight: 500;
            font-size: 0.95rem;
        }
        .sidebar-nav .nav-item i { width: 20px; text-align: center; font-size: 1rem; color: var(--text-muted); transition: color var(--transition); }
        .sidebar-nav .nav-item:hover { background: rgba(201,168,76,0.08); color: var(--primary-light); }
        .sidebar-nav .nav-item:hover i { color: var(--primary); }
        .sidebar-nav .nav-item.active {
            background: rgba(201,168,76,0.12);
            color: var(--primary);
            border-left: 3px solid var(--primary);
            padding-left: calc(var(--spacing-sm) - 3px);
        }
        .sidebar-nav .nav-item.active i { color: var(--primary); }
        .sidebar-footer {
            padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
            border-top: 1px solid var(--border-subtle);
            font-size: 0.75rem;
            color: var(--text-muted);
        }

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

        /* ===== Mobile Header ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background: var(--bg-sidebar);
            border-bottom: 1px solid var(--border-subtle);
            padding: 0.8rem var(--spacing-md);
            align-items: center;
            justify-content: space-between;
        }
        .mobile-header .logo-mobile {
            font-size: 1.1rem;
            font-weight: 800;
            color: var(--primary);
        }
        .mobile-header .menu-toggle {
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 1.5rem;
            cursor: pointer;
            padding: 0.25rem;
            transition: color var(--transition);
        }
        .mobile-header .menu-toggle:hover { color: var(--primary); }
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(0,0,0,0.6);
            z-index: 998;
            backdrop-filter: blur(4px);
        }
        .sidebar-overlay.open { display: block; }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 85vh;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: var(--spacing-xl) var(--spacing-md);
            overflow: hidden;
            background: var(--bg-deep);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            filter: brightness(0.35) saturate(1.2);
            transform: scale(1.05);
            transition: transform 0.6s ease;
        }
        .hero:hover .hero-bg { transform: scale(1.02); }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11,15,26,0.85) 0%, rgba(11,15,26,0.4) 50%, rgba(11,15,26,0.85) 100%);
        }
        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(201,168,76,0.15);
            border: 1px solid rgba(201,168,76,0.3);
            color: var(--primary-light);
            padding: 0.4rem 1.2rem;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: var(--spacing-md);
            letter-spacing: 1px;
        }
        .hero-badge i { font-size: 0.75rem; }
        .hero h1 {
            margin-bottom: 1.2rem;
            background: linear-gradient(135deg, #f0ece4 0%, var(--primary-light) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: clamp(1.1rem, 2vw, 1.35rem);
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto var(--spacing-md);
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: var(--spacing-sm);
            justify-content: center;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            padding: 0.85rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            text-decoration: none;
        }
        .btn-primary {
            background: var(--primary);
            color: #0b0f1a;
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            color: #0b0f1a;
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(201,168,76,0.3);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-primary);
            border: 1.5px solid rgba(240,236,228,0.25);
        }
        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary);
            transform: translateY(-2px);
        }
        .btn-secondary {
            background: rgba(201,168,76,0.12);
            color: var(--primary-light);
            border: 1px solid rgba(201,168,76,0.2);
        }
        .btn-secondary:hover {
            background: rgba(201,168,76,0.2);
            color: var(--primary);
            transform: translateY(-2px);
        }
        .btn-sm { padding: 0.6rem 1.4rem; font-size: 0.85rem; }
        .btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 4px; }

        /* ===== Section ===== */
        .section {
            padding: var(--spacing-xl) 0;
        }
        .section-alt {
            background: var(--bg-section-alt);
        }
        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto var(--spacing-lg);
        }
        .section-header h2 { margin-bottom: 0.8rem; }
        .section-header p { font-size: 1.1rem; color: var(--text-secondary); }
        .section-header .section-tag {
            display: inline-block;
            background: rgba(201,168,76,0.1);
            color: var(--primary);
            padding: 0.25rem 1rem;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 1px;
            margin-bottom: var(--spacing-sm);
            border: 1px solid rgba(201,168,76,0.15);
        }

        /* ===== Cards ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: var(--spacing-md);
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: var(--spacing-md);
            border: 1px solid var(--border-subtle);
            transition: all var(--transition);
            box-shadow: var(--shadow-card);
        }
        .card:hover {
            background: var(--bg-card-hover);
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(201,168,76,0.15);
        }
        .card .card-icon {
            width: 56px;
            height: 56px;
            border-radius: var(--radius-sm);
            background: rgba(201,168,76,0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--primary);
            margin-bottom: var(--spacing-sm);
            border: 1px solid rgba(201,168,76,0.1);
        }
        .card h3 { margin-bottom: 0.6rem; font-size: 1.2rem; }
        .card p { font-size: 0.95rem; color: var(--text-secondary); margin-bottom: 0; }
        .card .card-tag {
            display: inline-block;
            background: rgba(201,168,76,0.08);
            color: var(--primary-light);
            padding: 0.15rem 0.75rem;
            border-radius: 50px;
            font-size: 0.7rem;
            font-weight: 600;
            margin-bottom: var(--spacing-xs);
            letter-spacing: 0.5px;
        }

        /* ===== Card with cover ===== */
        .card-cover {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border-subtle);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-card);
        }
        .card-cover:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(201,168,76,0.15);
        }
        .card-cover .cover-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
            transition: transform 0.6s ease;
        }
        .card-cover:hover .cover-img { transform: scale(1.05); }
        .card-cover .cover-body {
            padding: var(--spacing-md);
        }
        .card-cover .cover-body h4 { margin-bottom: 0.4rem; font-size: 1.1rem; }
        .card-cover .cover-body p { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 0; }
        .card-cover .cover-meta {
            display: flex;
            align-items: center;
            gap: 0.8rem;
            font-size: 0.8rem;
            color: var(--text-muted);
            margin-top: var(--spacing-xs);
        }

        /* ===== Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: var(--spacing-md);
            counter-reset: step;
        }
        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: var(--spacing-md);
            border: 1px solid var(--border-subtle);
            text-align: center;
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover {
            background: var(--bg-card-hover);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card);
        }
        .step-card .step-number {
            counter-increment: step;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: rgba(201,168,76,0.12);
            border: 1px solid rgba(201,168,76,0.2);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 800;
            color: var(--primary);
            margin: 0 auto var(--spacing-sm);
        }
        .step-card h4 { margin-bottom: 0.4rem; }
        .step-card p { font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 0; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-subtle);
            margin-bottom: var(--spacing-xs);
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: rgba(201,168,76,0.15); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--spacing-sm) var(--spacing-md);
            cursor: pointer;
            font-weight: 600;
            color: var(--text-primary);
            font-size: 1rem;
            background: none;
            border: none;
            width: 100%;
            text-align: left;
            gap: var(--spacing-sm);
            transition: color var(--transition);
        }
        .faq-question:hover { color: var(--primary-light); }
        .faq-question i { color: var(--primary); font-size: 0.9rem; transition: transform var(--transition); }
        .faq-question.open i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 var(--spacing-md) var(--spacing-sm);
            color: var(--text-secondary);
            font-size: 0.95rem;
            display: none;
            line-height: 1.8;
        }
        .faq-answer.open { display: block; }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--bg-section-alt);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.06;
            pointer-events: none;
        }
        .cta-box {
            position: relative;
            text-align: center;
            padding: var(--spacing-lg) var(--spacing-md);
            max-width: 700px;
            margin: 0 auto;
        }
        .cta-box h2 { margin-bottom: 0.8rem; }
        .cta-box p { font-size: 1.1rem; color: var(--text-secondary); margin-bottom: var(--spacing-md); }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-sidebar);
            border-top: 1px solid var(--border-subtle);
            padding: var(--spacing-lg) 0 var(--spacing-md);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: var(--spacing-md);
            margin-bottom: var(--spacing-md);
        }
        .footer-brand .logo { font-size: 1.1rem; font-weight: 800; color: var(--primary); margin-bottom: 0.5rem; display: flex; align-items: center; gap: 0.5rem; }
        .footer-brand p { font-size: 0.9rem; color: var(--text-muted); max-width: 300px; }
        .footer-col h5 { font-size: 0.85rem; color: var(--text-primary); margin-bottom: var(--spacing-sm); letter-spacing: 1px; }
        .footer-col a {
            display: block;
            font-size: 0.9rem;
            color: var(--text-muted);
            padding: 0.25rem 0;
            transition: color var(--transition);
        }
        .footer-col a:hover { color: var(--primary); }
        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: var(--spacing-md);
            margin-top: var(--spacing-md);
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: var(--spacing-sm);
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .footer-bottom a { color: var(--text-muted); }
        .footer-bottom a:hover { color: var(--primary); }

        /* ===== Content List (CMS) ===== */
        .content-list { display: flex; flex-direction: column; gap: var(--spacing-sm); }
        .content-item {
            display: flex;
            align-items: flex-start;
            gap: var(--spacing-md);
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            padding: var(--spacing-sm) var(--spacing-md);
            border: 1px solid var(--border-subtle);
            transition: all var(--transition);
        }
        .content-item:hover {
            background: var(--bg-card-hover);
            border-color: rgba(201,168,76,0.12);
        }
        .content-item .item-thumb {
            width: 80px;
            height: 60px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
            background: var(--bg-deep);
        }
        .content-item .item-body { flex: 1; }
        .content-item .item-body h4 { font-size: 1rem; margin-bottom: 0.2rem; font-weight: 600; }
        .content-item .item-body h4 a { color: var(--text-primary); }
        .content-item .item-body h4 a:hover { color: var(--primary); }
        .content-item .item-body p { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 0; }
        .content-item .item-meta {
            display: flex;
            align-items: center;
            gap: 1rem;
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-top: 0.25rem;
        }
        .content-item .item-meta .cat { color: var(--primary); font-weight: 600; }

        /* ===== Empty State ===== */
        .empty-state {
            text-align: center;
            padding: var(--spacing-lg) var(--spacing-md);
            color: var(--text-muted);
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--border-subtle);
        }
        .empty-state i { font-size: 2.5rem; color: var(--text-muted); margin-bottom: var(--spacing-sm); opacity: 0.5; }
        .empty-state p { font-size: 1rem; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            .sidebar { transform: translateX(-100%); }
            .sidebar.open { transform: translateX(0); }
            .mobile-header { display: flex; }
            .main-content { margin-left: 0; padding-top: 60px; }
            .hero { min-height: 70vh; padding: var(--spacing-lg) var(--spacing-sm); }
            .section { padding: var(--spacing-lg) 0; }
            .card-grid { grid-template-columns: 1fr; }
            .steps-grid { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .content-item { flex-direction: column; }
            .content-item .item-thumb { width: 100%; height: 140px; }
            .hero-actions { flex-direction: column; align-items: center; }
            .cta-box { padding: var(--spacing-md) var(--spacing-sm); }
        }

        @media (max-width: 520px) {
            .steps-grid { grid-template-columns: 1fr; }
            .hero h1 { font-size: 1.8rem; }
            .section-header h2 { font-size: 1.5rem; }
            .card { padding: var(--spacing-sm); }
            .faq-question { font-size: 0.9rem; padding: var(--spacing-sm); }
            .faq-answer { padding: 0 var(--spacing-sm) var(--spacing-sm); }
            .container { padding: 0 var(--spacing-sm); }
        }

        /* ===== Scrollbar ===== */
        ::-webkit-scrollbar { width: 6px; }
        ::-webkit-scrollbar-track { background: var(--bg-deep); }
        ::-webkit-scrollbar-thumb { background: var(--border-subtle); border-radius: 3px; }
        ::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

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

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #e74c3c;
            --primary-dark: #c0392b;
            --primary-light: #f1948a;
            --primary-gradient: linear-gradient(135deg, #e74c3c 0%, #c0392b 100%);
            --secondary: #2c3e50;
            --secondary-light: #34495e;
            --accent: #f39c12;
            --bg: #f8f9fa;
            --bg-card: #ffffff;
            --bg-dark: #1a1a2e;
            --bg-section: #f0f2f5;
            --text: #2c3e50;
            --text-light: #7f8c8d;
            --text-white: #ffffff;
            --border: #e0e4e8;
            --border-light: #f0f0f0;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.10);
            --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.15);
            --radius: 16px;
            --radius-sm: 10px;
            --radius-xs: 6px;
            --sidebar-width: 240px;
            --header-height: 0px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
        }

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

        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }

        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            display: flex;
            min-height: 100vh;
            margin: 0;
            padding: 0;
        }

        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }

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

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

        ul,
        ol {
            list-style: none;
        }

        /* ===== Container ===== */
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            width: 100%;
        }

        /* ===== Sidebar Navigation (App Shell) ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-card);
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            box-shadow: 2px 0 20px rgba(0, 0, 0, 0.06);
            transition: var(--transition);
        }

        .sidebar-brand {
            padding: 28px 20px 16px;
            border-bottom: 1px solid var(--border-light);
            text-align: center;
        }

        .sidebar-brand .logo {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

        .sidebar-brand .logo i {
            font-size: 1.4rem;
        }

        .sidebar-brand .logo-sub {
            font-size: 0.75rem;
            color: var(--text-light);
            margin-top: 2px;
            letter-spacing: 1px;
        }

        .sidebar-nav {
            flex: 1;
            padding: 20px 12px;
            overflow-y: auto;
        }

        .sidebar-nav .nav-label {
            font-size: 0.7rem;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--text-light);
            padding: 0 12px 12px;
            font-weight: 600;
        }

        .sidebar-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: var(--text);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
            margin-bottom: 2px;
        }

        .sidebar-nav .nav-item i {
            width: 20px;
            text-align: center;
            font-size: 1.1rem;
            color: var(--text-light);
            transition: var(--transition);
        }

        .sidebar-nav .nav-item:hover {
            background: var(--bg-section);
            color: var(--primary);
        }
        .sidebar-nav .nav-item:hover i {
            color: var(--primary);
        }

        .sidebar-nav .nav-item.active {
            background: var(--primary);
            color: var(--text-white);
            box-shadow: 0 4px 15px rgba(231, 76, 60, 0.35);
        }

        .sidebar-nav .nav-item.active i {
            color: var(--text-white);
        }

        .sidebar-footer {
            padding: 16px 20px 24px;
            border-top: 1px solid var(--border-light);
            font-size: 0.8rem;
            color: var(--text-light);
            text-align: center;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
        }

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

        /* ===== Hero Banner (Inner Page) ===== */
        .page-hero {
            position: relative;
            padding: 80px 0 60px;
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
            overflow: hidden;
            min-height: 320px;
            display: flex;
            align-items: center;
        }

        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center/cover no-repeat;
            opacity: 0.2;
            mix-blend-mode: overlay;
        }

        .page-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to bottom, rgba(26, 26, 46, 0.3) 0%, rgba(26, 26, 46, 0.9) 100%);
        }

        .page-hero .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }

        .page-hero .hero-badge {
            display: inline-block;
            background: rgba(231, 76, 60, 0.2);
            border: 1px solid rgba(231, 76, 60, 0.3);
            color: var(--primary-light);
            padding: 4px 18px;
            border-radius: 50px;
            font-size: 0.8rem;
            letter-spacing: 1px;
            margin-bottom: 16px;
            backdrop-filter: blur(4px);
        }

        .page-hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
            margin-bottom: 16px;
            text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        }

        .page-hero h1 i {
            color: var(--accent);
            margin-right: 8px;
        }

        .page-hero p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 640px;
            margin: 0 auto 24px;
            line-height: 1.8;
        }

        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 40px;
            flex-wrap: wrap;
            margin-top: 20px;
        }

        .hero-stats .stat-item {
            text-align: center;
        }

        .hero-stats .stat-num {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--text-white);
            display: block;
        }

        .hero-stats .stat-label {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            padding: 16px 0;
            background: var(--bg-card);
            border-bottom: 1px solid var(--border-light);
        }

        .breadcrumb .container {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.9rem;
            color: var(--text-light);
        }

        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: var(--border);
        }
        .breadcrumb .current {
            color: var(--text);
            font-weight: 600;
        }

        /* ===== Section General ===== */
        .section {
            padding: 70px 0;
        }

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

        .section-title h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text);
            margin-bottom: 12px;
            position: relative;
            display: inline-block;
        }

        .section-title h2::after {
            content: '';
            display: block;
            width: 50px;
            height: 4px;
            background: var(--primary-gradient);
            border-radius: 4px;
            margin: 12px auto 0;
        }

        .section-title p {
            color: var(--text-light);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 12px auto 0;
        }

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

        .section-bg-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .section-bg-dark .section-title h2 {
            color: var(--text-white);
        }
        .section-bg-dark .section-title p {
            color: rgba(255, 255, 255, 0.7);
        }

        /* ===== Step / Tutorial Cards ===== */
        .step-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 28px;
        }

        .step-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 32px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            position: relative;
            text-align: center;
        }

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

        .step-card .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary-gradient);
            color: var(--text-white);
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 18px;
            box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
        }

        .step-card .step-icon {
            font-size: 2.2rem;
            color: var(--primary);
            margin-bottom: 16px;
        }

        .step-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text);
        }

        .step-card p {
            font-size: 0.92rem;
            color: var(--text-light);
            line-height: 1.7;
        }

        /* ===== Feature / Guide Blocks ===== */
        .guide-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
            gap: 28px;
        }

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

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

        .guide-card .card-img {
            height: 200px;
            overflow: hidden;
            position: relative;
        }

        .guide-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s ease;
        }

        .guide-card:hover .card-img img {
            transform: scale(1.05);
        }

        .guide-card .card-img .img-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            padding: 30px 20px 16px;
            background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
        }

        .guide-card .card-img .img-overlay .tag {
            display: inline-block;
            background: var(--primary);
            color: var(--text-white);
            padding: 2px 14px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
        }

        .guide-card .card-body {
            padding: 22px 24px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .guide-card .card-body h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text);
        }

        .guide-card .card-body p {
            font-size: 0.9rem;
            color: var(--text-light);
            line-height: 1.7;
            flex: 1;
        }

        .guide-card .card-body .card-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-top: 16px;
            padding-top: 14px;
            border-top: 1px solid var(--border-light);
            font-size: 0.82rem;
            color: var(--text-light);
        }

        .guide-card .card-body .card-meta .btn-text {
            color: var(--primary);
            font-weight: 600;
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .guide-card .card-body .card-meta .btn-text i {
            transition: var(--transition);
        }

        .guide-card .card-body .card-meta .btn-text:hover i {
            transform: translateX(4px);
        }

        /* ===== FAQ Section ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

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

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

        .faq-item .faq-q {
            padding: 18px 24px;
            font-weight: 600;
            color: var(--text);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 12px;
            font-size: 1rem;
            transition: var(--transition);
            user-select: none;
        }

        .faq-item .faq-q:hover {
            color: var(--primary);
        }

        .faq-item .faq-q .faq-icon {
            transition: var(--transition);
            color: var(--primary);
            flex-shrink: 0;
        }

        .faq-item.active .faq-q .faq-icon {
            transform: rotate(180deg);
        }

        .faq-item .faq-a {
            padding: 0 24px 20px;
            color: var(--text-light);
            font-size: 0.92rem;
            line-height: 1.8;
            display: none;
        }

        .faq-item.active .faq-a {
            display: block;
        }

        /* ===== CTA Section ===== */
        .cta-section {
            background: var(--primary-gradient);
            padding: 64px 0;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

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

        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 12px;
        }

        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 28px;
        }

        .cta-section .btn-group {
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            cursor: pointer;
            border: 2px solid transparent;
        }

        .btn-primary {
            background: var(--text-white);
            color: var(--primary);
            border-color: var(--text-white);
        }

        .btn-primary:hover {
            background: transparent;
            color: var(--text-white);
            border-color: var(--text-white);
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
        }

        .btn-outline-light {
            background: transparent;
            color: var(--text-white);
            border-color: rgba(255, 255, 255, 0.5);
        }

        .btn-outline-light:hover {
            background: var(--text-white);
            color: var(--primary);
            border-color: var(--text-white);
            transform: translateY(-2px);
        }

        .btn-sm {
            padding: 8px 20px;
            font-size: 0.85rem;
        }

        /* ===== Tags ===== */
        .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 16px;
        }

        .tag {
            display: inline-block;
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 0.82rem;
            font-weight: 500;
            background: var(--bg-section);
            color: var(--text-light);
            border: 1px solid var(--border);
            transition: var(--transition);
        }

        .tag:hover {
            background: var(--primary);
            color: var(--text-white);
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        .tag-primary {
            background: rgba(231, 76, 60, 0.1);
            color: var(--primary);
            border-color: rgba(231, 76, 60, 0.2);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 56px 0 0;
            flex-shrink: 0;
        }

        .footer .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .footer .footer-brand .logo {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-white);
            display: flex;
            align-items: center;
            gap: 8px;
            margin-bottom: 12px;
        }

        .footer .footer-brand .logo i {
            color: var(--primary);
        }

        .footer .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            max-width: 360px;
        }

        .footer .footer-col h5 {
            color: var(--text-white);
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .footer .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            padding: 6px 0;
            transition: var(--transition);
        }

        .footer .footer-col a:hover {
            color: var(--primary);
            padding-left: 4px;
        }

        .footer .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.4);
            flex-wrap: wrap;
            gap: 12px;
        }

        .footer .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer .footer-bottom a:hover {
            color: var(--primary);
        }

        /* ===== Mobile Nav Toggle ===== */
        .nav-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            background: var(--primary);
            color: var(--text-white);
            border: none;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-xs);
            font-size: 1.3rem;
            cursor: pointer;
            box-shadow: 0 4px 15px rgba(231, 76, 60, 0.3);
            transition: var(--transition);
            align-items: center;
            justify-content: center;
        }

        .nav-toggle:hover {
            background: var(--primary-dark);
            transform: scale(1.05);
        }

        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 999;
            backdrop-filter: blur(4px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .page-hero h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }

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

            .sidebar-overlay.active {
                display: block;
            }

            .nav-toggle {
                display: flex;
            }

            .main-content {
                margin-left: 0;
            }

            .page-hero {
                padding: 60px 0 40px;
                min-height: 260px;
            }

            .page-hero h1 {
                font-size: 1.8rem;
            }

            .page-hero p {
                font-size: 0.95rem;
            }

            .hero-stats {
                gap: 20px;
            }
            .hero-stats .stat-num {
                font-size: 1.4rem;
            }

            .section {
                padding: 50px 0;
            }

            .section-title h2 {
                font-size: 1.6rem;
            }

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

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

            .footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .footer .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;
            }

            .sidebar-brand .logo {
                font-size: 1.1rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }

            .page-hero h1 {
                font-size: 1.4rem;
            }

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

            .guide-card .card-body h3 {
                font-size: 1.05rem;
            }

            .faq-item .faq-q {
                padding: 14px 16px;
                font-size: 0.9rem;
            }

            .faq-item .faq-a {
                padding: 0 16px 16px;
                font-size: 0.85rem;
            }

            .btn {
                padding: 12px 24px;
                font-size: 0.9rem;
                width: 100%;
                justify-content: center;
            }

            .section-title h2 {
                font-size: 1.35rem;
            }

            .hero-stats .stat-num {
                font-size: 1.2rem;
            }
            .hero-stats .stat-label {
                font-size: 0.75rem;
            }
        }

/* roulang page: article */
/* ===== CSS Design Variables ===== */
        :root {
            --primary: #e8542a;
            --primary-light: #f06a42;
            --primary-dark: #c9441f;
            --primary-bg: rgba(232, 84, 42, 0.08);
            --primary-glow: rgba(232, 84, 42, 0.25);
            --secondary: #f59e0b;
            --secondary-light: #fbbf24;
            --accent: #8b5cf6;
            --bg: #f8f6f4;
            --bg-alt: #f0ece8;
            --bg-card: #ffffff;
            --bg-dark: #1a1410;
            --text: #2d1f1a;
            --text-light: #6b5d55;
            --text-lighter: #9c8e85;
            --text-white: #faf8f6;
            --border: #e5ddd8;
            --border-light: #f0eae6;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 36px rgba(0, 0, 0, 0.09);
            --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.12);
            --shadow-button: 0 4px 14px rgba(232, 84, 42, 0.3);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --sidebar-width: 240px;
            --header-height: 0px;
        }

        /* ===== 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);
            display: flex;
            min-height: 100vh;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        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);
        }

        /* ===== Container ===== */
        .container {
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Layout: Sidebar + Main ===== */
        .layout-wrapper {
            display: flex;
            width: 100%;
            min-height: 100vh;
        }

        /* ===== Sidebar ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-card);
            border-right: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition);
            box-shadow: 2px 0 20px rgba(0, 0, 0, 0.04);
        }
        .sidebar-brand {
            padding: 28px 20px 16px;
            border-bottom: 1px solid var(--border-light);
        }
        .sidebar-brand .logo {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .sidebar-brand .logo i {
            color: var(--primary);
            font-size: 1.3rem;
        }
        .sidebar-brand .logo-sub {
            font-size: 0.8rem;
            color: var(--text-lighter);
            margin-top: 2px;
            letter-spacing: 1px;
        }
        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            overflow-y: auto;
        }
        .sidebar-nav .nav-label {
            font-size: 0.7rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 1.5px;
            color: var(--text-lighter);
            padding: 8px 12px 6px;
        }
        .sidebar-nav .nav-item {
            display: flex;
            align-items: center;
            gap: 0.7rem;
            padding: 10px 14px;
            border-radius: var(--radius-sm);
            color: var(--text-light);
            font-weight: 500;
            font-size: 0.95rem;
            transition: all var(--transition);
            margin-bottom: 2px;
        }
        .sidebar-nav .nav-item i {
            width: 20px;
            text-align: center;
            font-size: 1rem;
            color: var(--text-lighter);
            transition: color var(--transition);
        }
        .sidebar-nav .nav-item:hover {
            background: var(--primary-bg);
            color: var(--primary);
        }
        .sidebar-nav .nav-item:hover i {
            color: var(--primary);
        }
        .sidebar-nav .nav-item.active {
            background: var(--primary-bg);
            color: var(--primary);
            font-weight: 600;
        }
        .sidebar-nav .nav-item.active i {
            color: var(--primary);
        }
        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid var(--border-light);
            font-size: 0.8rem;
            color: var(--text-lighter);
            display: flex;
            align-items: center;
        }

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

        /* ===== Article Header / Banner ===== */
        .article-banner {
            position: relative;
            padding: 60px 0 50px;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            min-height: 260px;
            display: flex;
            align-items: center;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(26, 20, 16, 0.85) 0%, rgba(232, 84, 42, 0.35) 100%);
            z-index: 1;
        }
        .article-banner .container {
            position: relative;
            z-index: 2;
            width: 100%;
        }
        .article-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 16px;
        }
        .article-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }
        .article-banner .breadcrumb a:hover {
            color: #fff;
        }
        .article-banner .breadcrumb .sep {
            color: rgba(255, 255, 255, 0.35);
        }
        .article-banner .article-category {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            font-size: 0.75rem;
            font-weight: 600;
            padding: 4px 14px;
            border-radius: 20px;
            letter-spacing: 0.5px;
            margin-bottom: 12px;
        }
        .article-banner h1 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            max-width: 800px;
            line-height: 1.3;
            text-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
        }
        .article-banner .article-meta {
            display: flex;
            align-items: center;
            gap: 1.2rem;
            margin-top: 16px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.7);
            flex-wrap: wrap;
        }
        .article-banner .article-meta i {
            margin-right: 4px;
        }

        /* ===== Article Body ===== */
        .article-section {
            padding: 50px 0 60px;
            flex: 1;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .article-content {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 40px 44px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
        }
        .article-content .article-body {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text);
        }
        .article-content .article-body p {
            margin-bottom: 1.2rem;
        }
        .article-content .article-body h2,
        .article-content .article-body h3 {
            margin-top: 1.8rem;
            margin-bottom: 0.8rem;
        }
        .article-content .article-body img {
            border-radius: var(--radius-sm);
            margin: 1.5rem 0;
            box-shadow: var(--shadow);
        }
        .article-content .article-body ul,
        .article-content .article-body ol {
            margin: 1rem 0;
            padding-left: 1.6rem;
        }
        .article-content .article-body li {
            margin-bottom: 0.5rem;
            list-style: disc;
        }
        .article-content .article-body a {
            color: var(--primary);
            text-decoration: underline;
        }
        .article-content .article-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-bg);
            padding: 16px 20px;
            margin: 1.5rem 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light);
            font-style: italic;
        }
        .article-content .article-body code {
            background: var(--bg-alt);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
        }

        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
        }
        .sidebar-card h4 {
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 14px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary-bg);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .sidebar-card h4 i {
            color: var(--primary);
        }
        .sidebar-card ul li {
            padding: 6px 0;
            border-bottom: 1px solid var(--border-light);
        }
        .sidebar-card ul li:last-child {
            border-bottom: none;
        }
        .sidebar-card ul li a {
            color: var(--text-light);
            font-size: 0.92rem;
            transition: color var(--transition);
        }
        .sidebar-card ul li a:hover {
            color: var(--primary);
        }
        .sidebar-card .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .sidebar-card .tag-list .tag {
            background: var(--primary-bg);
            color: var(--primary);
            font-size: 0.8rem;
            padding: 4px 14px;
            border-radius: 20px;
            font-weight: 500;
            transition: all var(--transition);
        }
        .sidebar-card .tag-list .tag:hover {
            background: var(--primary);
            color: #fff;
        }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 20px;
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            border: 1px solid var(--border-light);
        }
        .not-found-box i {
            font-size: 4rem;
            color: var(--text-lighter);
            margin-bottom: 20px;
        }
        .not-found-box h2 {
            font-size: 1.8rem;
            color: var(--text);
            margin-bottom: 12px;
        }
        .not-found-box p {
            color: var(--text-light);
            margin-bottom: 24px;
        }
        .not-found-box .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 12px 28px;
            background: var(--primary);
            color: #fff;
            border-radius: 50px;
            font-weight: 600;
            transition: all var(--transition);
        }
        .not-found-box .btn-back:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-button);
            color: #fff;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.8);
            padding: 48px 0 32px;
            margin-top: auto;
        }
        .footer .container {
            max-width: 1120px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand .logo {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin-bottom: 12px;
        }
        .footer-brand .logo i {
            color: var(--primary);
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            max-width: 360px;
        }
        .footer-col h5 {
            font-size: 0.9rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }
        .footer-col a {
            display: block;
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.88rem;
            padding: 4px 0;
            transition: color var(--transition);
        }
        .footer-col a:hover {
            color: var(--primary);
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding-top: 24px;
            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: var(--primary);
        }

        /* ===== Mobile Toggle ===== */
        .mobile-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            background: var(--bg-card);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            width: 44px;
            height: 44px;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            box-shadow: var(--shadow);
            color: var(--text);
            font-size: 1.2rem;
            transition: all var(--transition);
        }
        .mobile-toggle:hover {
            background: var(--primary-bg);
            color: var(--primary);
        }
        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.4);
            z-index: 999;
            backdrop-filter: blur(4px);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }
            .sidebar.open {
                transform: translateX(0);
            }
            .sidebar-overlay.open {
                display: block;
            }
            .mobile-toggle {
                display: flex;
            }
            .main-content {
                margin-left: 0;
            }
            .article-banner {
                padding: 40px 0 36px;
                min-height: 200px;
            }
            .article-banner h1 {
                font-size: 1.4rem;
            }
            .article-content {
                padding: 24px 20px;
            }
            .article-content .article-body {
                font-size: 1rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .article-sidebar {
                grid-template-columns: 1fr;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .article-banner h1 {
                font-size: 1.2rem;
            }
            .article-banner .article-meta {
                font-size: 0.78rem;
                gap: 0.8rem;
            }
            .article-content {
                padding: 18px 14px;
            }
            .sidebar-card {
                padding: 18px;
            }
            .footer {
                padding: 32px 0 24px;
            }
        }

        /* ===== Utility ===== */
        .text-center {
            text-align: center;
        }
        .mt-1 {
            margin-top: 0.5rem;
        }
        .mt-2 {
            margin-top: 1rem;
        }
        .mb-1 {
            margin-bottom: 0.5rem;
        }
        .mb-2 {
            margin-bottom: 1rem;
        }
        .gap-1 {
            gap: 0.5rem;
        }
        .gap-2 {
            gap: 1rem;
        }
        .flex {
            display: flex;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }
        .items-center {
            align-items: center;
        }