/* roulang page: index */
:root {
            --primary: #1e3a5f;
            --primary-light: #2a5298;
            --primary-dark: #0f2440;
            --accent: #f0a500;
            --accent-light: #ffc233;
            --accent-dark: #c98800;
            --bg: #f8fafc;
            --bg-card: #ffffff;
            --bg-dark: #0f172a;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f8fafc;
            --border: #e2e8f0;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-xs: 6px;
            --shadow: 0 4px 24px rgba(0,0,0,0.06);
            --shadow-hover: 0 12px 40px rgba(0,0,0,0.10);
            --transition: all 0.25s ease;
            --spacing-section: 5rem;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.6;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: var(--transition);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button, input, textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.5rem;
        }
        .section {
            padding: var(--spacing-section) 0;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            margin-bottom: 0.75rem;
            color: var(--text);
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-light);
            max-width: 640px;
            margin-bottom: 2.5rem;
            line-height: 1.7;
        }
        .text-accent {
            color: var(--accent);
        }
        .bg-accent {
            background: var(--accent);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.75rem 1.75rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
        }
        .btn-primary:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(30,58,95,0.25);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-accent {
            background: var(--accent);
            color: #1e293b;
        }
        .btn-accent:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(240,165,0,0.3);
        }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-sm {
            padding: 0.5rem 1.25rem;
            font-size: 0.85rem;
        }
        .badge {
            display: inline-block;
            padding: 0.25rem 0.85rem;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 600;
            background: var(--border);
            color: var(--text-light);
            transition: var(--transition);
        }
        .badge-accent {
            background: rgba(240,165,0,0.15);
            color: var(--accent-dark);
        }
        .badge-primary {
            background: rgba(30,58,95,0.1);
            color: var(--primary);
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            transition: var(--transition);
            overflow: hidden;
            border: 1px solid rgba(226,232,240,0.4);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .card-body {
            padding: 1.5rem;
        }
        .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            background: #eef2f7;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
        }
        .grid-3 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr;
            gap: 2rem;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: 1fr 1fr 1fr 1fr;
            gap: 1.5rem;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-between {
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .gap-1 { gap: 0.5rem; }
        .gap-2 { gap: 1rem; }
        .gap-3 { gap: 1.5rem; }
        .gap-4 { gap: 2rem; }
        .mt-1 { margin-top: 0.5rem; }
        .mt-2 { margin-top: 1rem; }
        .mt-3 { margin-top: 1.5rem; }
        .mt-4 { margin-top: 2rem; }
        .mb-1 { margin-bottom: 0.5rem; }
        .mb-2 { margin-bottom: 1rem; }
        .mb-3 { margin-bottom: 1.5rem; }
        .mb-4 { margin-bottom: 2rem; }
        .text-center { text-align: center; }
        .text-sm { font-size: 0.9rem; }
        .text-xs { font-size: 0.8rem; }
        .text-muted { color: var(--text-light); }
        .fw-600 { font-weight: 600; }
        .fw-700 { font-weight: 700; }
        .lh-tight { line-height: 1.3; }
        /* Header & Nav */
        .site-header {
            background: rgba(255,255,255,0.95);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 100;
            padding: 0 1.5rem;
        }
        .nav-inner {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 68px;
        }
        .logo {
            font-size: 1.4rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .logo i {
            color: var(--accent);
            font-size: 1.6rem;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 0.25rem;
            list-style: none;
        }
        .nav-links a {
            padding: 0.5rem 1rem;
            border-radius: 50px;
            font-weight: 500;
            font-size: 0.9rem;
            color: var(--text-light);
            transition: var(--transition);
        }
        .nav-links a:hover {
            background: rgba(30,58,95,0.06);
            color: var(--primary);
        }
        .nav-links a.active {
            background: var(--primary);
            color: #fff;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--text);
            cursor: pointer;
            padding: 0.25rem;
        }
        /* Hero */
        .hero {
            padding: 5rem 0 4rem;
            background: linear-gradient(135deg, #f0f4fa 0%, #e8edf5 100%);
            position: relative;
            overflow: hidden;
        }
        .hero::after {
            content: '';
            position: absolute;
            top: -30%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(240,165,0,0.08) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 3rem;
            align-items: center;
        }
        .hero h1 {
            font-size: 3rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            line-height: 1.2;
            color: var(--primary-dark);
        }
        .hero h1 span {
            color: var(--accent);
        }
        .hero p {
            font-size: 1.1rem;
            color: var(--text-light);
            margin: 1.25rem 0 2rem;
            max-width: 520px;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }
        .hero-visual {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow-hover);
            padding: 2rem;
            border: 1px solid rgba(226,232,240,0.5);
            display: flex;
            flex-direction: column;
            gap: 1.25rem;
        }
        .hero-visual-item {
            display: flex;
            align-items: center;
            gap: 1rem;
            padding: 1rem 1.25rem;
            background: #f8fafc;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .hero-visual-item:hover {
            background: #fff;
            border-color: var(--accent);
        }
        .hero-visual-item .icon {
            width: 44px;
            height: 44px;
            border-radius: 12px;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            flex-shrink: 0;
        }
        .hero-visual-item .icon.accent {
            background: var(--accent);
            color: #1e293b;
        }
        .hero-visual-item .text {
            flex: 1;
        }
        .hero-visual-item .text .title {
            font-weight: 600;
            font-size: 0.95rem;
        }
        .hero-visual-item .text .desc {
            font-size: 0.85rem;
            color: var(--text-light);
        }
        /* Stats */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
        }
        .stat-item {
            text-align: center;
            padding: 1.5rem 1rem;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
        }
        .stat-item .num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
        }
        .stat-item .label {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-top: 0.25rem;
        }
        /* Features */
        .feature-card {
            padding: 2rem 1.5rem;
            text-align: center;
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
            border-color: rgba(240,165,0,0.2);
        }
        .feature-card .icon {
            width: 60px;
            height: 60px;
            border-radius: 16px;
            background: rgba(30,58,95,0.08);
            color: var(--primary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            margin: 0 auto 1rem;
            transition: var(--transition);
        }
        .feature-card:hover .icon {
            background: var(--primary);
            color: #fff;
        }
        .feature-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
        }
        .feature-card p {
            font-size: 0.92rem;
            color: var(--text-light);
            line-height: 1.6;
        }
        /* Category cards */
        .cat-card {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .cat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .cat-card .cover {
            height: 180px;
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 2.5rem;
            color: rgba(255,255,255,0.2);
        }
        .cat-card .cover.accent-bg {
            background: linear-gradient(135deg, var(--accent) 0%, var(--accent-light) 100%);
        }
        .cat-card .info {
            padding: 1.25rem 1.5rem 1.5rem;
        }
        .cat-card .info h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 0.35rem;
        }
        .cat-card .info p {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-bottom: 1rem;
            line-height: 1.5;
        }
        /* Content list */
        .content-list {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }
        .content-item {
            display: flex;
            align-items: flex-start;
            gap: 1.25rem;
            padding: 1.25rem 1.5rem;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .content-item:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow);
        }
        .content-item .num {
            width: 32px;
            height: 32px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 0.85rem;
            flex-shrink: 0;
            margin-top: 0.15rem;
        }
        .content-item .info {
            flex: 1;
        }
        .content-item .info .title {
            font-weight: 600;
            font-size: 1rem;
            margin-bottom: 0.2rem;
        }
        .content-item .info .title a {
            color: var(--text);
        }
        .content-item .info .title a:hover {
            color: var(--primary);
        }
        .content-item .info .meta {
            font-size: 0.82rem;
            color: var(--text-light);
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
            margin-top: 0.3rem;
        }
        .content-item .info .meta .tag {
            background: rgba(30,58,95,0.08);
            padding: 0.15rem 0.6rem;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 500;
            color: var(--primary);
        }
        /* FAQ */
        .faq-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            padding: 1.25rem 1.5rem;
            transition: var(--transition);
            cursor: pointer;
        }
        .faq-item:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow);
        }
        .faq-item .q {
            font-weight: 600;
            font-size: 0.98rem;
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }
        .faq-item .q i {
            color: var(--accent);
            font-size: 0.9rem;
        }
        .faq-item .a {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-top: 0.5rem;
            line-height: 1.6;
            padding-left: 1.65rem;
        }
        /* CTA */
        .cta-section {
            background: var(--primary);
            border-radius: var(--radius);
            padding: 3.5rem 3rem;
            text-align: center;
            color: #fff;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.02em;
        }
        .cta-section p {
            color: rgba(255,255,255,0.75);
            max-width: 520px;
            margin: 0.75rem auto 1.5rem;
            font-size: 1.05rem;
        }
        .cta-section .btn {
            background: var(--accent);
            color: #1e293b;
        }
        .cta-section .btn:hover {
            background: var(--accent-light);
        }
        /* Footer */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.7);
            padding: 3rem 0 2rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2.5rem;
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: 0.75rem;
        }
        .footer-brand p {
            font-size: 0.9rem;
            max-width: 320px;
            line-height: 1.7;
            color: rgba(255,255,255,0.55);
        }
        .footer-col h4 {
            color: #fff;
            font-weight: 600;
            font-size: 0.95rem;
            margin-bottom: 1rem;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 0.5rem;
        }
        .footer-col ul a {
            font-size: 0.88rem;
            color: rgba(255,255,255,0.55);
            transition: var(--transition);
        }
        .footer-col ul a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.08);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
            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: var(--accent);
        }
        /* Breadcrumb */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.88rem;
            color: var(--text-light);
            padding: 1rem 0;
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: var(--border);
        }
        /* Mobile */
        @media (max-width: 1024px) {
            .grid-4 { grid-template-columns: 1fr 1fr; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .hero h1 { font-size: 2.4rem; }
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 68px;
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 1rem 1.5rem 1.5rem;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow);
                gap: 0.25rem;
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links a {
                width: 100%;
                padding: 0.7rem 1rem;
            }
            .nav-toggle {
                display: block;
            }
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 1rem; }
            .grid-2, .grid-3 {
                grid-template-columns: 1fr;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
            .faq-grid {
                grid-template-columns: 1fr;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .cta-section {
                padding: 2.5rem 1.5rem;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .hero-visual {
                padding: 1.25rem;
            }
            .hero-visual-item {
                padding: 0.75rem 1rem;
            }
        }
        @media (max-width: 520px) {
            .stats-grid {
                grid-template-columns: 1fr 1fr;
                gap: 0.75rem;
            }
            .stat-item .num {
                font-size: 1.6rem;
            }
            .hero h1 { font-size: 1.6rem; }
            .hero-actions {
                flex-direction: column;
            }
            .hero-actions .btn {
                width: 100%;
                justify-content: center;
            }
            .grid-4 {
                grid-template-columns: 1fr;
            }
            .content-item {
                flex-direction: column;
                gap: 0.75rem;
            }
            .container {
                padding: 0 1rem;
            }
            .section {
                padding: 3rem 0;
            }
        }
        /* Focus accessibility */
        a:focus-visible, button:focus-visible, input:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        /* Empty state */
        .empty-state {
            text-align: center;
            padding: 2.5rem 1.5rem;
            color: var(--text-light);
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px dashed var(--border);
        }
        .empty-state i {
            font-size: 2.5rem;
            color: var(--border);
            margin-bottom: 0.75rem;
        }

/* roulang page: article */
:root {
    --brand-500: #3b82f6;
    --brand-600: #2563eb;
    --brand-700: #1d4ed8;
    --accent-500: #22c55e;
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --bg-body: #f8fafc;
    --bg-card: #ffffff;
    --border-light: #e2e8f0;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px -2px rgba(0,0,0,0.06);
    --transition: 0.2s ease;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica Neue,Arial,sans-serif;background:var(--bg-body);color:var(--text-primary);line-height:1.6;-webkit-font-smoothing:antialiased}
a{color:var(--brand-600);text-decoration:none;transition:color var(--transition)}
a:hover{color:var(--brand-700)}
img{max-width:100%;height:auto;display:block}
button{cursor:pointer;border:none;background:none;font-family:inherit}
input,textarea{font-family:inherit;outline:none}
.container{max-width:1200px;margin:0 auto;padding:0 1.5rem}
@media (max-width:640px){.container{padding:0 1rem}}

/* Header */
.site-header{background:#fff;border-bottom:1px solid var(--border-light);position:sticky;top:0;z-index:50;backdrop-filter:blur(12px);background:rgba(255,255,255,0.92)}
.nav-inner{max-width:1200px;margin:0 auto;padding:0 1.5rem;display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:0.5rem;font-size:1.35rem;font-weight:700;color:var(--text-primary);letter-spacing:-0.02em;transition:opacity var(--transition)}
.logo i{color:var(--brand-500);font-size:1.5rem}
.logo:hover{opacity:0.85;color:var(--text-primary)}
.nav-toggle{display:none;font-size:1.4rem;color:var(--text-primary);padding:0.4rem;border-radius:var(--radius-md);transition:background var(--transition)}
.nav-toggle:hover{background:var(--border-light)}
nav ul{display:flex;align-items:center;gap:0.25rem;list-style:none}
nav ul li a{display:block;padding:0.5rem 1rem;font-size:0.95rem;font-weight:500;color:var(--text-secondary);border-radius:var(--radius-md);transition:all var(--transition)}
nav ul li a:hover{color:var(--brand-600);background:#eff6ff}
nav ul li a.active{color:var(--brand-600);background:#eff6ff;font-weight:600}
@media (max-width:768px){
.nav-toggle{display:block}
nav{position:fixed;top:68px;left:0;right:0;background:#fff;border-bottom:1px solid var(--border-light);padding:0.5rem 1.5rem 1rem;transform:translateY(-120%);opacity:0;pointer-events:none;transition:all 0.3s ease;box-shadow:0 12px 24px -8px rgba(0,0,0,0.08)}
nav.open{transform:translateY(0);opacity:1;pointer-events:auto}
nav ul{flex-direction:column;gap:0.125rem}
nav ul li a{padding:0.7rem 1rem;font-size:1rem}
}

/* Breadcrumb */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:0.5rem;padding:1.25rem 0 0.5rem;font-size:0.9rem;color:var(--text-muted)}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--brand-500)}
.breadcrumb span{color:var(--text-secondary)}
.breadcrumb .sep{color:var(--text-muted);font-size:0.75rem}

/* Article Content */
.article-wrapper{max-width:820px;margin:0 auto;padding:2rem 0 3.5rem}
.article-header{margin-bottom:2rem;padding-bottom:1.5rem;border-bottom:1px solid var(--border-light)}
.article-category{display:inline-block;background:#eff6ff;color:var(--brand-600);font-size:0.8rem;font-weight:600;padding:0.2rem 0.8rem;border-radius:999px;margin-bottom:0.75rem;letter-spacing:0.02em}
.article-title{font-size:2rem;font-weight:800;line-height:1.3;margin-bottom:1rem;color:var(--text-primary);letter-spacing:-0.01em}
.article-meta{display:flex;flex-wrap:wrap;align-items:center;gap:0.75rem 1.5rem;font-size:0.9rem;color:var(--text-muted)}
.article-meta i{margin-right:0.3rem;width:1rem;text-align:center}
.article-body{font-size:1.05rem;line-height:1.85;color:var(--text-secondary)}
.article-body p{margin-bottom:1.2rem}
.article-body h2,.article-body h3,.article-body h4{margin-top:1.8rem;margin-bottom:0.8rem;color:var(--text-primary);font-weight:700;line-height:1.35}
.article-body h2{font-size:1.5rem}
.article-body h3{font-size:1.25rem}
.article-body ul,.article-body ol{padding-left:1.5rem;margin-bottom:1.2rem}
.article-body li{margin-bottom:0.4rem}
.article-body a{color:var(--brand-600);text-decoration:underline;text-underline-offset:2px}
.article-body a:hover{color:var(--brand-700)}
.article-body blockquote{border-left:4px solid var(--brand-300);background:#f1f5f9;padding:0.8rem 1.2rem;margin:1.2rem 0;border-radius:0 var(--radius-md) var(--radius-md) 0;color:var(--text-secondary);font-style:normal}
.article-body img{border-radius:var(--radius-lg);margin:1.5rem 0;box-shadow:var(--shadow-md)}
.article-body code{background:#f1f5f9;padding:0.15rem 0.5rem;border-radius:0.25rem;font-size:0.9em;color:#1e293b}
.article-body pre{background:#1e293b;color:#e2e8f0;padding:1rem 1.25rem;border-radius:var(--radius-lg);overflow-x:auto;margin:1.2rem 0;font-size:0.9rem;line-height:1.6}
.article-body pre code{background:transparent;padding:0;color:inherit;font-size:inherit;border-radius:0}
.article-tags{display:flex;flex-wrap:wrap;gap:0.5rem;margin-top:2rem;padding-top:1.5rem;border-top:1px solid var(--border-light)}
.article-tags .tag{background:#f1f5f9;color:var(--text-secondary);font-size:0.8rem;padding:0.25rem 0.75rem;border-radius:999px;transition:all var(--transition)}
.article-tags .tag:hover{background:#eff6ff;color:var(--brand-600)}

/* Not Found */
.not-found{text-align:center;padding:4rem 1.5rem}
.not-found i{font-size:3rem;color:var(--text-muted);margin-bottom:1rem;display:block}
.not-found h2{font-size:1.6rem;font-weight:700;margin-bottom:0.75rem}
.not-found p{color:var(--text-secondary);margin-bottom:1.5rem}
.not-found .btn-back{display:inline-flex;align-items:center;gap:0.5rem;background:var(--brand-500);color:#fff;padding:0.7rem 1.6rem;border-radius:var(--radius-md);font-weight:600;transition:all var(--transition)}
.not-found .btn-back:hover{background:var(--brand-600);color:#fff;transform:translateY(-1px);box-shadow:0 4px 12px rgba(59,130,246,0.3)}

/* Footer */
.site-footer{background:#0f172a;color:#cbd5e1;padding:3.5rem 0 0;margin-top:3rem}
.footer-grid{display:grid;grid-template-columns:1.8fr 1fr 1fr 1fr;gap:2.5rem;padding-bottom:2rem;border-bottom:1px solid #1e293b}
.footer-brand .logo{color:#fff;font-size:1.25rem;margin-bottom:0.75rem}
.footer-brand .logo i{color:#60a5fa}
.footer-brand p{font-size:0.9rem;line-height:1.7;color:#94a3b8;max-width:320px}
.footer-col h4{color:#fff;font-size:0.95rem;font-weight:600;margin-bottom:1rem;letter-spacing:0.02em}
.footer-col ul{list-style:none;padding:0}
.footer-col ul li{margin-bottom:0.45rem}
.footer-col ul li a{color:#94a3b8;font-size:0.9rem;transition:all var(--transition)}
.footer-col ul li a:hover{color:#60a5fa;padding-left:3px}
.footer-bottom{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;padding:1.4rem 0;font-size:0.85rem;color:#64748b;gap:0.75rem}
.footer-bottom span:last-child{font-family:monospace;letter-spacing:0.02em}
@media (max-width:768px){
.footer-grid{grid-template-columns:1fr 1fr;gap:1.5rem}
.footer-brand{grid-column:1/-1}
.footer-brand p{max-width:100%}
}
@media (max-width:520px){
.footer-grid{grid-template-columns:1fr;gap:1.25rem}
.footer-bottom{flex-direction:column;text-align:center}
}

/* Responsive Article */
@media (max-width:768px){
.article-title{font-size:1.5rem}
.article-body{font-size:0.98rem}
.article-wrapper{padding:1.5rem 0 2.5rem}
}
@media (max-width:520px){
.article-title{font-size:1.3rem}
.article-meta{flex-direction:column;align-items:flex-start;gap:0.35rem}
}

/* roulang page: category2 */
:root {
            --primary: #2563eb;
            --primary-dark: #1d4ed8;
            --primary-light: #dbeafe;
            --accent: #f59e0b;
            --accent-dark: #d97706;
            --bg-body: #f8fafc;
            --bg-card: #ffffff;
            --text-main: #0f172a;
            --text-muted: #64748b;
            --text-light: #94a3b8;
            --border-color: #e2e8f0;
            --radius: 12px;
            --radius-sm: 8px;
            --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 12px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --transition: 200ms cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
        }

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

        body {
            font-family: var(--font-sans);
            background: var(--bg-body);
            color: var(--text-main);
            line-height: 1.6;
            -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: color var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding-left: 24px;
            padding-right: 24px;
        }

        /* ---------- 导航 ---------- */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 50;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border-color);
            box-shadow: 0 1px 4px rgba(0,0,0,0.02);
        }

        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
            height: 68px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--text-main);
            letter-spacing: -0.3px;
            transition: opacity var(--transition);
        }
        .logo i {
            color: var(--primary);
            font-size: 1.5rem;
        }
        .logo:hover {
            opacity: 0.85;
            color: var(--text-main);
        }

        .nav-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: var(--text-main);
            cursor: pointer;
            padding: 8px;
            border-radius: var(--radius-sm);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--primary-light);
        }

        .nav-links {
            display: flex;
            align-items: center;
            gap: 8px;
            list-style: none;
        }
        .nav-links li a {
            display: inline-block;
            padding: 8px 18px;
            border-radius: 999px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
            transition: all var(--transition);
        }
        .nav-links li a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav-links li a.active {
            color: #fff;
            background: var(--primary);
            box-shadow: 0 2px 8px rgba(37, 99, 235, 0.3);
        }

        /* ---------- 页脚 ---------- */
        .site-footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 60px 0 30px;
            margin-top: 80px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            color: #fff;
            font-size: 1.4rem;
            margin-bottom: 12px;
        }
        .footer-brand .logo i {
            color: #60a5fa;
        }
        .footer-brand p {
            color: #94a3b8;
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 360px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            font-weight: 600;
            margin-bottom: 16px;
        }
        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-col ul li a {
            color: #94a3b8;
            font-size: 0.9rem;
            transition: color var(--transition);
        }
        .footer-col ul li a:hover {
            color: #60a5fa;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding-top: 28px;
            border-top: 1px solid #1e293b;
            font-size: 0.85rem;
            color: #64748b;
        }
        .footer-bottom span:last-child {
            font-family: monospace;
            letter-spacing: 0.3px;
            background: #1e293b;
            padding: 4px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
        }

        /* ---------- 通用板块 ---------- */
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.5px;
            line-height: 1.25;
            color: var(--text-main);
            margin-bottom: 8px;
        }
        .section-subtitle {
            font-size: 1.05rem;
            color: var(--text-muted);
            max-width: 620px;
            margin-bottom: 40px;
        }

        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 999px;
            font-size: 0.8rem;
            font-weight: 500;
            background: var(--primary-light);
            color: var(--primary);
        }

        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 999px;
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
        }
        .btn:hover {
            background: var(--primary-dark);
            box-shadow: 0 6px 20px rgba(37, 99, 235, 0.35);
            transform: translateY(-1px);
            color: #fff;
        }
        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--primary);
            box-shadow: none;
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.2);
        }

        /* ---------- 分类页 Hero ---------- */
        .category-hero {
            padding: 80px 0 60px;
            background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
            border-bottom: 1px solid var(--border-color);
        }
        .category-hero .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 40px;
            flex-wrap: wrap;
        }
        .category-hero-text {
            flex: 1 1 480px;
        }
        .category-hero-text h1 {
            font-size: 2.6rem;
            font-weight: 800;
            letter-spacing: -0.8px;
            line-height: 1.2;
            margin-bottom: 16px;
            color: var(--text-main);
        }
        .category-hero-text h1 i {
            color: var(--primary);
            margin-right: 6px;
        }
        .category-hero-text p {
            font-size: 1.1rem;
            color: var(--text-muted);
            line-height: 1.7;
            max-width: 540px;
            margin-bottom: 28px;
        }
        .category-hero-stats {
            display: flex;
            gap: 32px;
            flex-wrap: wrap;
        }
        .category-hero-stats .stat-item {
            text-align: center;
        }
        .category-hero-stats .stat-item .num {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--primary);
            display: block;
        }
        .category-hero-stats .stat-item .label {
            font-size: 0.85rem;
            color: var(--text-muted);
        }
        .category-hero-visual {
            flex: 0 0 300px;
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .category-hero-visual .icon-ring {
            width: 220px;
            height: 220px;
            border-radius: 50%;
            background: rgba(37, 99, 235, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 4.5rem;
            color: var(--primary);
            border: 2px dashed rgba(37, 99, 235, 0.2);
            animation: pulse-ring 3s ease-in-out infinite;
        }
        @keyframes pulse-ring {
            0%, 100% { transform: scale(1); opacity: 1; }
            50% { transform: scale(1.04); opacity: 0.8; }
        }

        /* ---------- 教程分类标签 ---------- */
        .tutorial-tabs {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 48px;
        }
        .tutorial-tabs .tab-btn {
            padding: 10px 24px;
            border-radius: 999px;
            border: 1px solid var(--border-color);
            background: #fff;
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-muted);
            cursor: pointer;
            transition: all var(--transition);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .tutorial-tabs .tab-btn i {
            font-size: 0.85rem;
        }
        .tutorial-tabs .tab-btn:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-light);
        }
        .tutorial-tabs .tab-btn.active {
            background: var(--primary);
            color: #fff;
            border-color: var(--primary);
            box-shadow: 0 2px 10px rgba(37, 99, 235, 0.25);
        }

        /* ---------- 教程卡片网格 ---------- */
        .tutorial-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
            gap: 28px;
        }
        .tutorial-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }
        .tutorial-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-3px);
        }
        .tutorial-card .card-image {
            height: 190px;
            background: #f1f5f9;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 3rem;
            color: var(--primary);
            position: relative;
            overflow: hidden;
        }
        .tutorial-card .card-image .play-overlay {
            position: absolute;
            inset: 0;
            background: rgba(0,0,0,0.3);
            display: flex;
            align-items: center;
            justify-content: center;
            opacity: 0;
            transition: opacity var(--transition);
        }
        .tutorial-card:hover .card-image .play-overlay {
            opacity: 1;
        }
        .tutorial-card .card-image .play-overlay i {
            color: #fff;
            font-size: 3rem;
            filter: drop-shadow(0 4px 12px rgba(0,0,0,0.4));
        }
        .tutorial-card .card-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .tutorial-card .card-body .card-tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 999px;
            font-size: 0.75rem;
            font-weight: 500;
            background: var(--primary-light);
            color: var(--primary);
            margin-bottom: 10px;
            align-self: flex-start;
        }
        .tutorial-card .card-body h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .tutorial-card .card-body p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
            flex: 1;
            margin-bottom: 16px;
        }
        .tutorial-card .card-body .card-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.8rem;
            color: var(--text-light);
            border-top: 1px solid var(--border-color);
            padding-top: 14px;
        }
        .tutorial-card .card-body .card-meta i {
            margin-right: 4px;
        }

        /* ---------- 步骤流程 ---------- */
        .steps-section {
            background: #fff;
            border-radius: var(--radius-lg);
            padding: 60px 0;
            margin-top: 40px;
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px;
            counter-reset: step;
        }
        .step-item {
            text-align: center;
            padding: 24px 16px;
            border-radius: var(--radius);
            background: var(--bg-body);
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            position: relative;
        }
        .step-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
        }
        .step-item .step-number {
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 700;
            margin: 0 auto 16px;
        }
        .step-item h4 {
            font-size: 1.05rem;
            font-weight: 600;
            margin-bottom: 6px;
        }
        .step-item p {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.6;
        }

        /* ---------- FAQ ---------- */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            padding: 20px 24px;
            transition: all var(--transition);
            cursor: pointer;
        }
        .faq-item:hover {
            border-color: var(--primary);
            box-shadow: var(--shadow-sm);
        }
        .faq-item .faq-q {
            font-weight: 600;
            font-size: 1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
        }
        .faq-item .faq-q i {
            color: var(--text-light);
            transition: transform var(--transition);
            font-size: 0.9rem;
        }
        .faq-item.open .faq-q i {
            transform: rotate(180deg);
        }
        .faq-item .faq-a {
            margin-top: 12px;
            font-size: 0.92rem;
            color: var(--text-muted);
            line-height: 1.7;
            display: none;
        }
        .faq-item.open .faq-a {
            display: block;
        }

        /* ---------- CTA ---------- */
        .cta-section {
            background: linear-gradient(135deg, #1e3a5f 0%, #0f172a 100%);
            padding: 72px 0;
            border-radius: var(--radius-lg);
            margin: 60px 0;
            text-align: center;
            color: #fff;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 12px;
        }
        .cta-section p {
            color: #94a3b8;
            font-size: 1.05rem;
            max-width: 520px;
            margin: 0 auto 28px;
        }
        .cta-section .btn {
            background: var(--accent);
            color: #0f172a;
            box-shadow: 0 4px 20px rgba(245, 158, 11, 0.35);
        }
        .cta-section .btn:hover {
            background: var(--accent-dark);
            box-shadow: 0 6px 28px rgba(245, 158, 11, 0.45);
        }

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

        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 68px;
                left: 0;
                right: 0;
                flex-direction: column;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(14px);
                -webkit-backdrop-filter: blur(14px);
                border-bottom: 1px solid var(--border-color);
                padding: 16px 24px;
                gap: 4px;
                box-shadow: var(--shadow-md);
            }
            .nav-links.open {
                display: flex;
            }
            .nav-links li a {
                width: 100%;
                text-align: center;
                padding: 12px 18px;
            }

            .category-hero {
                padding: 48px 0 40px;
            }
            .category-hero-text h1 {
                font-size: 1.8rem;
            }
            .category-hero-visual .icon-ring {
                width: 140px;
                height: 140px;
                font-size: 3rem;
            }
            .category-hero-stats {
                gap: 20px;
            }
            .category-hero-stats .stat-item .num {
                font-size: 1.4rem;
            }

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

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

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

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }

            .cta-section h2 {
                font-size: 1.5rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding-left: 16px;
                padding-right: 16px;
            }
            .category-hero-text h1 {
                font-size: 1.5rem;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .tutorial-tabs .tab-btn {
                padding: 8px 16px;
                font-size: 0.8rem;
            }
            .btn {
                padding: 10px 20px;
                font-size: 0.85rem;
            }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1e40af;
            --primary-light: #3b82f6;
            --primary-dark: #1e3a8a;
            --primary-bg: #eff6ff;
            --secondary: #f59e0b;
            --secondary-light: #fbbf24;
            --accent: #10b981;
            --bg-body: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text-main: #0f172a;
            --text-weak: #64748b;
            --text-inverse: #ffffff;
            --border: #e2e8f0;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-xs: 6px;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.06), 0 4px 10px rgba(0, 0, 0, 0.04);
            --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.08);
            --shadow-card: 0 4px 12px rgba(0, 0, 0, 0.05);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Noto Sans', sans-serif;
            --container-max: 1200px;
            --header-h: 72px;
        }

        /* ===== Base Reset ===== */
        *,
        *::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);
            color: var(--text-main);
            background: var(--bg-body);
            line-height: 1.7;
            font-size: 16px;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }
        button {
            font: inherit;
            cursor: pointer;
            border: none;
            background: none;
        }
        input,
        textarea {
            font: inherit;
            border: none;
            outline: none;
        }
        ul {
            list-style: none;
        }

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

        /* ===== Header / Nav ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
            height: var(--header-h);
            display: flex;
            align-items: center;
        }
        .nav-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 22px;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.3px;
        }
        .logo i {
            font-size: 26px;
            color: var(--primary-light);
        }
        .logo:hover {
            color: var(--primary-dark);
        }
        .nav-toggle {
            display: none;
            font-size: 24px;
            color: var(--text-main);
            padding: 6px 10px;
            border-radius: var(--radius-xs);
            transition: background var(--transition);
        }
        .nav-toggle:hover {
            background: var(--bg-alt);
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-links li a {
            display: inline-block;
            padding: 8px 18px;
            border-radius: 40px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-weak);
            transition: all var(--transition);
            letter-spacing: 0.2px;
        }
        .nav-links li a:hover {
            color: var(--primary);
            background: var(--primary-bg);
        }
        .nav-links li a.active {
            color: var(--text-inverse);
            background: var(--primary);
            box-shadow: 0 4px 12px rgba(30, 64, 175, 0.25);
        }
        .nav-links li a.active:hover {
            background: var(--primary-dark);
        }

        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .nav-links {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: rgba(255, 255, 255, 0.98);
                backdrop-filter: blur(16px);
                -webkit-backdrop-filter: blur(16px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                box-shadow: var(--shadow-lg);
            }
            .nav-links.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-links li a {
                width: 100%;
                padding: 12px 18px;
                border-radius: var(--radius-sm);
                font-size: 16px;
            }
            .nav-links li a.active {
                background: var(--primary);
                color: #fff;
            }
        }

        @media (max-width: 480px) {
            .logo {
                font-size: 18px;
            }
            .logo i {
                font-size: 22px;
            }
            .nav-inner {
                padding: 0 16px;
            }
        }

        /* ===== Hero ===== */
        .page-hero {
            padding: 80px 0 60px;
            background: linear-gradient(135deg, var(--primary-bg) 0%, #e0e7ff 100%);
            position: relative;
            overflow: hidden;
        }
        .page-hero::after {
            content: '';
            position: absolute;
            top: -60%;
            right: -20%;
            width: 600px;
            height: 600px;
            border-radius: 50%;
            background: rgba(59, 130, 246, 0.06);
            pointer-events: none;
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
        }
        .page-hero h1 {
            font-size: 44px;
            font-weight: 800;
            line-height: 1.2;
            color: var(--primary-dark);
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .page-hero h1 i {
            color: var(--primary-light);
            margin-right: 10px;
        }
        .page-hero p {
            font-size: 18px;
            color: var(--text-weak);
            max-width: 680px;
            margin-bottom: 32px;
            line-height: 1.8;
        }
        .page-hero .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(255, 255, 255, 0.7);
            backdrop-filter: blur(8px);
            padding: 8px 20px;
            border-radius: 40px;
            font-size: 14px;
            font-weight: 500;
            color: var(--primary);
            margin-bottom: 20px;
            border: 1px solid rgba(59, 130, 246, 0.15);
        }
        .page-hero .hero-badge i {
            color: var(--secondary);
        }
        .btn-group {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            justify-content: center;
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 32px;
            border-radius: 40px;
            font-size: 16px;
            font-weight: 600;
            transition: all var(--transition);
            letter-spacing: 0.2px;
            border: 2px solid transparent;
        }
        .btn-primary {
            background: var(--primary);
            color: #fff;
            box-shadow: 0 6px 18px rgba(30, 64, 175, 0.25);
        }
        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(30, 64, 175, 0.3);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-secondary {
            background: transparent;
            color: var(--primary);
            border-color: var(--primary);
        }
        .btn-secondary:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-2px);
        }
        .btn-secondary:active {
            transform: translateY(0);
        }
        .btn-accent {
            background: var(--accent);
            color: #fff;
            box-shadow: 0 6px 18px rgba(16, 185, 129, 0.25);
        }
        .btn-accent:hover {
            background: #059669;
            transform: translateY(-2px);
            box-shadow: 0 10px 28px rgba(16, 185, 129, 0.3);
        }
        .btn-sm {
            padding: 10px 22px;
            font-size: 14px;
        }
        .btn-lg {
            padding: 18px 42px;
            font-size: 18px;
        }

        /* ===== Section ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-alt);
        }
        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--text-main);
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .section-sub {
            font-size: 17px;
            color: var(--text-weak);
            max-width: 640px;
            line-height: 1.8;
        }
        .section-head {
            text-align: center;
            margin-bottom: 52px;
        }
        .section-head .section-sub {
            margin: 0 auto;
        }

        /* ===== Cards ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 28px;
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 32px 28px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: rgba(30, 64, 175, 0.15);
        }
        .card-icon {
            width: 52px;
            height: 52px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 24px;
            color: #fff;
            margin-bottom: 18px;
            background: var(--primary-light);
        }
        .card-icon.green {
            background: var(--accent);
        }
        .card-icon.amber {
            background: var(--secondary);
        }
        .card-icon.purple {
            background: #8b5cf6;
        }
        .card-icon.rose {
            background: #f43f5e;
        }
        .card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 10px;
            color: var(--text-main);
        }
        .card p {
            color: var(--text-weak);
            font-size: 15px;
            line-height: 1.7;
        }
        .card .badge-group {
            margin-top: 16px;
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        /* ===== Badges ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            border-radius: 40px;
            font-size: 13px;
            font-weight: 500;
            background: var(--primary-bg);
            color: var(--primary);
        }
        .badge.green {
            background: #ecfdf5;
            color: #059669;
        }
        .badge.amber {
            background: #fffbeb;
            color: #d97706;
        }
        .badge.rose {
            background: #fff1f2;
            color: #e11d48;
        }

        /* ===== Steps ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 32px;
            counter-reset: step;
        }
        .step-card {
            text-align: center;
            padding: 28px 20px;
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-md);
        }
        .step-card::before {
            counter-increment: step;
            content: counter(step);
            display: block;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 20px;
            font-weight: 700;
            line-height: 44px;
            text-align: center;
            margin: 0 auto 16px;
            box-shadow: 0 4px 12px rgba(30, 64, 175, 0.2);
        }
        .step-card h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
            color: var(--text-main);
        }
        .step-card p {
            font-size: 14px;
            color: var(--text-weak);
            line-height: 1.7;
        }

        /* ===== Check List ===== */
        .check-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
            max-width: 720px;
            margin: 0 auto;
        }
        .check-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
            padding: 18px 22px;
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
        }
        .check-item:hover {
            border-color: var(--primary-light);
            background: var(--primary-bg);
        }
        .check-item i {
            font-size: 20px;
            color: var(--accent);
            margin-top: 2px;
            flex-shrink: 0;
        }
        .check-item .check-text {
            font-size: 16px;
            font-weight: 500;
            color: var(--text-main);
        }
        .check-item .check-desc {
            font-size: 14px;
            color: var(--text-weak);
            margin-top: 2px;
        }

        /* ===== FAQ ===== */
        .faq-grid {
            max-width: 780px;
            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);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-q {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 20px 24px;
            font-size: 17px;
            font-weight: 600;
            color: var(--text-main);
            cursor: pointer;
            gap: 16px;
            transition: background var(--transition);
        }
        .faq-q:hover {
            background: var(--bg-alt);
        }
        .faq-q i {
            font-size: 18px;
            color: var(--text-weak);
            transition: transform var(--transition);
            flex-shrink: 0;
        }
        .faq-item.open .faq-q i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1), padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-weak);
            font-size: 15px;
            line-height: 1.8;
        }
        .faq-item.open .faq-a {
            max-height: 320px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            border-radius: var(--radius);
            padding: 56px 48px;
            text-align: center;
            color: #fff;
            box-shadow: 0 20px 50px rgba(30, 64, 175, 0.2);
        }
        .cta-block h2 {
            font-size: 34px;
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }
        .cta-block p {
            font-size: 17px;
            opacity: 0.85;
            max-width: 560px;
            margin: 0 auto 28px;
            line-height: 1.8;
        }
        .cta-block .btn {
            background: #fff;
            color: var(--primary);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
        }
        .cta-block .btn:hover {
            background: var(--secondary);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.2);
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0f172a;
            color: rgba(255, 255, 255, 0.7);
            padding: 56px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand .logo {
            color: #fff;
            margin-bottom: 14px;
        }
        .footer-brand p {
            font-size: 14px;
            line-height: 1.8;
            max-width: 320px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            transition: color var(--transition);
        }
        .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;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }
        @media (max-width: 900px) {
            .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;
            }
        }

        /* ===== Responsive Helpers ===== */
        @media (max-width: 1024px) {
            .page-hero h1 {
                font-size: 36px;
            }
            .section-title {
                font-size: 28px;
            }
            .cta-block h2 {
                font-size: 28px;
            }
            .cta-block {
                padding: 44px 28px;
            }
        }
        @media (max-width: 768px) {
            .page-hero {
                padding: 60px 0 44px;
            }
            .page-hero h1 {
                font-size: 30px;
            }
            .page-hero p {
                font-size: 16px;
            }
            .section {
                padding: 56px 0;
            }
            .section-title {
                font-size: 24px;
            }
            .section-head {
                margin-bottom: 36px;
            }
            .card-grid {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .btn-group {
                flex-direction: column;
                align-items: center;
            }
            .btn-lg {
                padding: 14px 32px;
                font-size: 16px;
            }
            .cta-block h2 {
                font-size: 24px;
            }
            .cta-block {
                padding: 36px 20px;
            }
        }
        @media (max-width: 520px) {
            .card-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .page-hero h1 {
                font-size: 26px;
            }
            .page-hero p {
                font-size: 15px;
            }
            .section-title {
                font-size: 22px;
            }
            .check-item {
                padding: 14px 16px;
            }
            .faq-q {
                padding: 16px 18px;
                font-size: 15px;
            }
            .faq-a {
                padding: 0 18px;
                font-size: 14px;
            }
            .faq-item.open .faq-a {
                padding: 0 18px 16px;
            }
        }

        /* ===== Misc ===== */
        .divider {
            width: 60px;
            height: 4px;
            border-radius: 4px;
            background: var(--primary-light);
            margin: 16px auto 24px;
        }
        .text-accent {
            color: var(--accent);
        }
        .text-primary {
            color: var(--primary);
        }
        .gap-section {
            height: 2px;
            background: linear-gradient(to right, transparent, var(--border), transparent);
            margin: 0;
        }

        /* focus-visible for accessibility */
        *:focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 2px;
        }