/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --color-primary: #0b0e1a;
            --color-primary-light: #161c2e;
            --color-accent: #f05a28;
            --color-accent-hover: #d44a1e;
            --color-gold: #ffc107;
            --color-gold-light: #ffd54f;
            --color-bg: #f5f7fa;
            --color-bg-dark: #0b0e1a;
            --color-bg-card: #ffffff;
            --color-bg-section: #ffffff;
            --color-text: #1a1d23;
            --color-text-light: #6c757d;
            --color-text-lighter: #9ea3ad;
            --color-text-on-dark: #f0f2f5;
            --color-text-muted: #a0a8b4;
            --color-border: #e9edf2;
            --color-border-light: #f0f3f7;
            --color-success: #28a745;
            --color-warning: #ffc107;
            --color-danger: #dc3545;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
            --font-mono: 'JetBrains Mono', 'Consolas', monospace;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
            --shadow-md: 0 8px 24px rgba(0,0,0,0.07);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.10);
            --shadow-xl: 0 24px 64px rgba(0,0,0,0.14);
            --shadow-glow: 0 0 40px rgba(240,90,40,0.15);
            --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
            --transition-slow: 0.45s cubic-bezier(0.4,0,0.2,1);
            --max-width: 1200px;
            --header-height: 72px;
            --spacing-section: 100px;
            --spacing-section-mobile: 60px;
        }

        /* ===== 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);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background: var(--color-bg);
            overflow-x: hidden;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        ul, ol { list-style: none; }
        button, input, select, textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            background: none;
        }
        button { cursor: pointer; }
        h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.25; color: var(--color-text); }
        h1 { font-size: 3.2rem; }
        h2 { font-size: 2.4rem; }
        h3 { font-size: 1.6rem; }
        h4 { font-size: 1.25rem; }
        p { margin-bottom: 1rem; color: var(--color-text-light); }
        strong { font-weight: 600; color: var(--color-text); }

        /* ===== 容器 ===== */
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container { padding: 0 16px; }
        }

        /* ===== 通用组件 ===== */
        .section { padding: var(--spacing-section) 0; }
        .section-dark { background: var(--color-bg-dark); color: var(--color-text-on-dark); }
        .section-dark h2,
        .section-dark h3,
        .section-dark p { color: var(--color-text-on-dark); }
        .section-light { background: var(--color-bg-section); }
        .section-gray { background: var(--color-bg); }

        .section-header {
            text-align: center;
            margin-bottom: 56px;
        }
        .section-header h2 {
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }
        .section-header p {
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto;
            color: var(--color-text-light);
        }
        .section-header .badge {
            display: inline-block;
            background: var(--color-accent);
            color: #fff;
            font-size: 0.75rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            padding: 4px 16px;
            border-radius: 100px;
            margin-bottom: 16px;
        }
        .section-dark .section-header p { color: var(--color-text-muted); }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: var(--radius-md);
            transition: all var(--transition);
            border: 2px solid transparent;
            letter-spacing: 0.01em;
        }
        .btn-primary {
            background: var(--color-accent);
            color: #fff;
            border-color: var(--color-accent);
        }
        .btn-primary:hover {
            background: var(--color-accent-hover);
            border-color: var(--color-accent-hover);
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(240,90,40,0.25);
        }
        .btn-outline-light {
            background: transparent;
            color: #fff;
            border-color: rgba(255,255,255,0.35);
        }
        .btn-outline-light:hover {
            background: rgba(255,255,255,0.08);
            border-color: #fff;
            transform: translateY(-2px);
        }
        .btn-gold {
            background: var(--color-gold);
            color: #1a1d23;
            border-color: var(--color-gold);
        }
        .btn-gold:hover {
            background: var(--color-gold-light);
            border-color: var(--color-gold-light);
            transform: translateY(-2px);
            box-shadow: 0 12px 28px rgba(255,193,7,0.30);
        }
        .btn-lg { padding: 16px 44px; font-size: 1.1rem; border-radius: var(--radius-lg); }
        .btn-sm { padding: 8px 20px; font-size: 0.875rem; border-radius: var(--radius-sm); }

        .card {
            background: var(--color-bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--color-border);
        }
        .card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .card-dark {
            background: var(--color-primary-light);
            border-color: rgba(255,255,255,0.06);
        }
        .card-dark:hover {
            box-shadow: var(--shadow-lg);
        }

        .badge {
            display: inline-block;
            padding: 2px 12px;
            font-size: 0.75rem;
            font-weight: 600;
            border-radius: 100px;
            background: var(--color-border);
            color: var(--color-text-light);
        }
        .badge-accent { background: var(--color-accent); color: #fff; }
        .badge-gold { background: var(--color-gold); color: #1a1d23; }
        .badge-success { background: var(--color-success); color: #fff; }

        .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
        .grid-3 { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 28px; }
        .grid-4 { display: grid; grid-template-columns: 1fr 1fr 1fr 1fr; gap: 24px; }

        .tag {
            display: inline-block;
            padding: 2px 10px;
            font-size: 0.75rem;
            border-radius: var(--radius-sm);
            background: var(--color-border);
            color: var(--color-text-light);
            transition: all var(--transition);
        }
        .tag:hover { background: var(--color-accent); color: #fff; }

        .divider {
            width: 60px;
            height: 3px;
            background: var(--color-accent);
            border-radius: 4px;
            margin: 16px auto;
        }
        .divider-left { margin: 16px 0; }

        /* ===== Header & Nav ===== */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: rgba(11,14,26,0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            z-index: 1000;
            transition: all var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .site-logo {
            font-size: 1.35rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: -0.02em;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .site-logo .logo-icon {
            width: 36px;
            height: 36px;
            background: var(--color-accent);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            color: #fff;
            font-weight: 700;
        }
        .site-logo span { color: var(--color-gold); }

        .main-nav { display: flex; align-items: center; gap: 8px; }
        .main-nav a {
            padding: 6px 18px;
            font-size: 0.95rem;
            font-weight: 500;
            color: rgba(255,255,255,0.7);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
            position: relative;
        }
        .main-nav a:hover { color: #fff; background: rgba(255,255,255,0.06); }
        .main-nav a.active {
            color: #fff;
            background: rgba(240,90,40,0.15);
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--color-accent);
            border-radius: 4px;
        }
        .main-nav .nav-cta {
            background: var(--color-accent);
            color: #fff;
            padding: 8px 24px;
            border-radius: var(--radius-md);
            font-weight: 600;
        }
        .main-nav .nav-cta:hover {
            background: var(--color-accent-hover);
            transform: translateY(-1px);
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            padding: 8px;
            cursor: pointer;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2px;
            background: #fff;
            border-radius: 4px;
            transition: all var(--transition);
        }

        @media (max-width: 768px) {
            .nav-toggle { display: flex; }
            .main-nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(11,14,26,0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 24px 20px 32px;
                gap: 4px;
                border-bottom: 1px solid rgba(255,255,255,0.06);
                transform: translateY(-120%);
                opacity: 0;
                transition: all var(--transition-slow);
                pointer-events: none;
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .main-nav a {
                padding: 12px 16px;
                width: 100%;
                font-size: 1.05rem;
            }
            .main-nav a.active::after { display: none; }
            .main-nav a.active { background: rgba(240,90,40,0.12); }
            .main-nav .nav-cta { margin-top: 8px; text-align: center; }
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 92vh;
            display: flex;
            align-items: center;
            background: var(--color-primary);
            overflow: hidden;
            padding-top: var(--header-height);
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            transform: scale(1.05);
            transition: transform 12s ease;
        }
        .hero:hover .hero-bg { transform: scale(1.0); }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11,14,26,0.92) 30%, rgba(11,14,26,0.55) 70%, rgba(11,14,26,0.30) 100%);
        }
        .hero .container {
            position: relative;
            z-index: 2;
            padding-top: 40px;
            padding-bottom: 60px;
        }
        .hero-content {
            max-width: 720px;
        }
        .hero-content .badge-hero {
            display: inline-block;
            background: rgba(240,90,40,0.18);
            color: var(--color-accent);
            font-size: 0.8rem;
            font-weight: 600;
            padding: 6px 20px;
            border-radius: 100px;
            border: 1px solid rgba(240,90,40,0.25);
            margin-bottom: 20px;
            letter-spacing: 0.04em;
        }
        .hero-content h1 {
            color: #fff;
            font-size: 3.6rem;
            font-weight: 800;
            line-height: 1.15;
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }
        .hero-content h1 span { color: var(--color-gold); }
        .hero-content p {
            font-size: 1.2rem;
            color: rgba(255,255,255,0.7);
            max-width: 540px;
            margin-bottom: 32px;
            line-height: 1.7;
        }
        .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
        .hero-stats {
            display: flex;
            gap: 40px;
            margin-top: 48px;
            padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.08);
        }
        .hero-stats .stat-item .stat-num {
            font-size: 1.8rem;
            font-weight: 800;
            color: #fff;
        }
        .hero-stats .stat-item .stat-label {
            font-size: 0.85rem;
            color: var(--color-text-muted);
        }

        @media (max-width: 768px) {
            .hero { min-height: 80vh; }
            .hero-content h1 { font-size: 2.2rem; }
            .hero-content p { font-size: 1rem; }
            .hero-stats { gap: 24px; flex-wrap: wrap; }
            .hero-stats .stat-item .stat-num { font-size: 1.4rem; }
        }
        @media (max-width: 520px) {
            .hero-content h1 { font-size: 1.8rem; }
            .hero-actions { flex-direction: column; }
            .hero-actions .btn { width: 100%; justify-content: center; }
            .hero-stats { gap: 16px; }
            .hero-stats .stat-item { flex: 1 1 40%; }
        }

        /* ===== 核心说明 ===== */
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 48px;
            align-items: center;
        }
        .intro-text h2 { margin-bottom: 16px; }
        .intro-text p { font-size: 1.05rem; }
        .intro-features {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin-top: 24px;
        }
        .intro-features li {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 0.95rem;
            color: var(--color-text-light);
        }
        .intro-features li i { color: var(--color-accent); font-size: 1rem; width: 20px; }
        .intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            position: relative;
        }
        .intro-image img { width: 100%; height: 380px; object-fit: cover; transition: transform var(--transition-slow); }
        .intro-image:hover img { transform: scale(1.03); }

        @media (max-width: 768px) {
            .intro-grid { grid-template-columns: 1fr; gap: 32px; }
            .intro-image img { height: 260px; }
            .intro-features { grid-template-columns: 1fr; }
        }

        /* ===== 分类入口 ===== */
        .category-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--color-bg-card);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--color-border);
            cursor: pointer;
        }
        .category-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-6px);
        }
        .category-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .category-card:hover .card-img { transform: scale(1.05); }
        .category-card .card-body {
            padding: 20px 24px 24px;
        }
        .category-card .card-body h3 {
            font-size: 1.2rem;
            margin-bottom: 6px;
        }
        .category-card .card-body p {
            font-size: 0.9rem;
            color: var(--color-text-light);
            margin-bottom: 0;
        }
        .category-card .card-body .tag {
            margin-top: 12px;
        }

        @media (max-width: 768px) {
            .category-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
        }
        @media (max-width: 520px) {
            .category-grid { grid-template-columns: 1fr; }
        }

        /* ===== 数据统计 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            text-align: center;
        }
        .stat-card {
            padding: 36px 20px;
            background: rgba(255,255,255,0.04);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255,255,255,0.06);
            transition: all var(--transition);
        }
        .stat-card:hover {
            background: rgba(255,255,255,0.07);
            transform: translateY(-2px);
        }
        .stat-card .icon {
            font-size: 2rem;
            color: var(--color-gold);
            margin-bottom: 12px;
        }
        .stat-card .num {
            font-size: 2.4rem;
            font-weight: 800;
            color: #fff;
            line-height: 1.2;
        }
        .stat-card .label {
            font-size: 0.9rem;
            color: var(--color-text-muted);
            margin-top: 4px;
        }

        @media (max-width: 768px) {
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
            .stat-card .num { font-size: 1.8rem; }
        }
        @media (max-width: 520px) {
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
            .stat-card { padding: 24px 12px; }
        }

        /* ===== 最新资讯 (CMS) ===== */
        .news-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }
        .news-card {
            display: flex;
            flex-direction: column;
            background: var(--color-bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border);
            transition: all var(--transition);
        }
        .news-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .news-card .news-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
            transition: transform var(--transition-slow);
        }
        .news-card:hover .news-img { transform: scale(1.03); }
        .news-card .news-body {
            padding: 20px 24px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .news-card .news-body .news-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.8rem;
            color: var(--color-text-lighter);
            margin-bottom: 8px;
        }
        .news-card .news-body .news-meta .cat {
            color: var(--color-accent);
            font-weight: 600;
        }
        .news-card .news-body h3 {
            font-size: 1.1rem;
            margin-bottom: 8px;
            line-height: 1.4;
        }
        .news-card .news-body h3 a { color: var(--color-text); }
        .news-card .news-body h3 a:hover { color: var(--color-accent); }
        .news-card .news-body p {
            font-size: 0.9rem;
            color: var(--color-text-light);
            margin-bottom: 0;
            flex: 1;
        }
        .news-card .news-body .read-more {
            margin-top: 14px;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--color-accent);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .news-card .news-body .read-more:hover { gap: 12px; }

        .news-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            color: var(--color-text-light);
            font-size: 1.05rem;
            background: var(--color-bg-card);
            border-radius: var(--radius-md);
            border: 1px dashed var(--color-border);
        }

        @media (max-width: 768px) {
            .news-list { grid-template-columns: 1fr; }
        }

        /* ===== 平台流程 ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }
        .step-card {
            text-align: center;
            padding: 32px 16px;
            background: var(--color-bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--color-border);
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-4px);
        }
        .step-card .step-num {
            width: 48px;
            height: 48px;
            background: var(--color-accent);
            color: #fff;
            font-size: 1.2rem;
            font-weight: 800;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
        }
        .step-card h4 { font-size: 1.1rem; margin-bottom: 8px; }
        .step-card p { font-size: 0.9rem; margin-bottom: 0; }

        @media (max-width: 768px) {
            .steps-grid { grid-template-columns: 1fr 1fr; gap: 16px; }
        }
        @media (max-width: 520px) {
            .steps-grid { grid-template-columns: 1fr; }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--color-bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--color-border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--color-accent); }
        .faq-item .faq-q {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1.05rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: var(--color-text);
            user-select: none;
        }
        .faq-item .faq-q i {
            font-size: 0.8rem;
            color: var(--color-text-light);
            transition: transform var(--transition);
        }
        .faq-item.open .faq-q i { transform: rotate(180deg); }
        .faq-item .faq-a {
            max-height: 0;
            overflow: hidden;
            transition: max-height var(--transition-slow), padding var(--transition-slow);
            padding: 0 24px;
            color: var(--color-text-light);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-a {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--color-primary);
            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: 0.12;
        }
        .cta-content {
            position: relative;
            z-index: 2;
            text-align: center;
            padding: 80px 20px;
        }
        .cta-content h2 {
            color: #fff;
            font-size: 2.6rem;
            margin-bottom: 16px;
        }
        .cta-content p {
            color: rgba(255,255,255,0.7);
            font-size: 1.15rem;
            max-width: 520px;
            margin: 0 auto 32px;
        }
        .cta-content .btn { font-size: 1.1rem; padding: 16px 48px; }

        @media (max-width: 768px) {
            .cta-content h2 { font-size: 1.8rem; }
            .cta-content p { font-size: 1rem; }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #080a14;
            color: rgba(255,255,255,0.6);
            padding: 56px 0 32px;
            border-top: 1px solid rgba(255,255,255,0.04);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .footer-brand .site-logo { margin-bottom: 12px; }
        .footer-brand p {
            font-size: 0.9rem;
            color: rgba(255,255,255,0.5);
            max-width: 320px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-col ul li { margin-bottom: 8px; }
        .footer-col ul li a {
            font-size: 0.9rem;
            color: rgba(255,255,255,0.5);
            transition: color var(--transition);
        }
        .footer-col ul li a:hover { color: var(--color-accent); }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.35);
        }
        .footer-bottom a { color: rgba(255,255,255,0.35); }
        .footer-bottom a:hover { color: var(--color-accent); }

        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .footer-bottom { flex-direction: column; gap: 8px; text-align: center; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; }
        }

        /* ===== 响应式微调 ===== */
        @media (max-width: 1024px) {
            .grid-4 { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
            :root { --spacing-section: var(--spacing-section-mobile); }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            h3 { font-size: 1.3rem; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 12px; }
            .section { padding: 48px 0; }
            .btn-lg { padding: 14px 32px; }
        }

        /* ===== 辅助 ===== */
        .text-center { text-align: center; }
        .mt-16 { margin-top: 16px; }
        .mt-24 { margin-top: 24px; }
        .mt-32 { margin-top: 32px; }
        .mb-16 { margin-bottom: 16px; }
        .gap-8 { gap: 8px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --clr-primary: #1a2a4a;
            --clr-primary-light: #2c4a7c;
            --clr-primary-dark: #0f1a2e;
            --clr-accent: #f0a030;
            --clr-accent-hover: #d48c1a;
            --clr-accent-light: #fce4b8;
            --clr-bg: #f5f7fa;
            --clr-bg-alt: #eef1f6;
            --clr-bg-dark: #0b1120;
            --clr-bg-card: #ffffff;
            --clr-text: #1a2332;
            --clr-text-light: #5a6a7e;
            --clr-text-lighter: #8a9aaa;
            --clr-text-inverse: #f0f4f8;
            --clr-border: #dce1e8;
            --clr-border-light: #e8ecf2;
            --clr-success: #2ecc71;
            --clr-warning: #f39c12;
            --clr-danger: #e74c3c;
            --clr-info: #3498db;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.04);
            --shadow-md: 0 6px 24px rgba(0,0,0,0.07);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.10);
            --shadow-xl: 0 24px 64px rgba(0,0,0,0.14);
            --space-xs: 6px;
            --space-sm: 12px;
            --space-md: 24px;
            --space-lg: 48px;
            --space-xl: 80px;
            --space-2xl: 120px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --font-display: 'Inter', 'SF Pro Display', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--clr-text);
            background: var(--clr-bg);
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--clr-primary-light); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--clr-accent); }
        ul, ol { list-style: none; }
        button, input, select, textarea { font-family: inherit; font-size: inherit; border: none; outline: none; }
        button { cursor: pointer; background: none; }
        h1, h2, h3, h4, h5, h6 { font-family: var(--font-display); line-height: 1.3; font-weight: 600; color: var(--clr-text); }
        h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
        h2 { font-size: clamp(1.5rem, 3.6vw, 2.4rem); }
        h3 { font-size: clamp(1.15rem, 2.2vw, 1.5rem); }
        h4 { font-size: 1.1rem; }
        p { margin-bottom: 1rem; color: var(--clr-text-light); }
        .container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-md); }

        /* ===== 辅助类 ===== */
        .text-center { text-align: center; }
        .text-accent { color: var(--clr-accent); }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
        .section-padding { padding: var(--space-xl) 0; }
        .section-padding-sm { padding: var(--space-lg) 0; }
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 500;
            letter-spacing: 0.3px;
            background: var(--clr-accent-light);
            color: var(--clr-primary-dark);
        }
        .badge-primary {
            background: var(--clr-primary);
            color: var(--clr-text-inverse);
        }
        .badge-success {
            background: var(--clr-success);
            color: #fff;
        }
        .badge-warning {
            background: var(--clr-warning);
            color: #fff;
        }
        .divider {
            width: 60px;
            height: 3px;
            background: var(--clr-accent);
            border-radius: 4px;
            margin: var(--space-sm) 0 var(--space-md);
        }
        .divider-center { margin-left: auto; margin-right: auto; }

        /* ===== Header / 导航 ===== */
        .site-header {
            position: fixed;
            top: 0; left: 0; right: 0;
            z-index: 1000;
            background: rgba(11, 17, 32, 0.92);
            backdrop-filter: blur(16px);
            -webkit-backdrop-filter: blur(16px);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-family: var(--font-display);
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--clr-text-inverse);
            letter-spacing: 0.5px;
            text-decoration: none;
        }
        .site-logo .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            background: var(--clr-accent);
            border-radius: 8px;
            font-size: 1.1rem;
            font-weight: 800;
            color: var(--clr-primary-dark);
        }
        .site-logo span { color: var(--clr-accent); font-weight: 600; }
        .site-logo:hover { color: var(--clr-text-inverse); }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .main-nav a {
            padding: 8px 18px;
            font-size: 0.92rem;
            font-weight: 500;
            color: rgba(255,255,255,0.7);
            border-radius: 8px;
            transition: all var(--transition);
            position: relative;
            text-decoration: none;
        }
        .main-nav a:hover {
            color: #fff;
            background: rgba(255,255,255,0.08);
        }
        .main-nav a.active {
            color: #fff;
            background: rgba(255,255,255,0.10);
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px; left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--clr-accent);
            border-radius: 4px;
        }
        .main-nav a.nav-cta {
            background: var(--clr-accent);
            color: var(--clr-primary-dark);
            font-weight: 600;
            padding: 8px 22px;
            border-radius: 50px;
            margin-left: 8px;
        }
        .main-nav a.nav-cta:hover {
            background: var(--clr-accent-hover);
            color: var(--clr-primary-dark);
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(240, 160, 48, 0.35);
        }
        .main-nav a.nav-cta i { margin-right: 6px; font-size: 0.8rem; }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 6px;
            background: transparent;
            border: none;
        }
        .nav-toggle span {
            display: block;
            width: 26px;
            height: 2.5px;
            background: var(--clr-text-inverse);
            border-radius: 4px;
            transition: all var(--transition);
        }
        .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
        .nav-toggle.active span:nth-child(2) { opacity: 0; }
        .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

        /* ===== Hero / Banner ===== */
        .page-hero {
            position: relative;
            padding: 140px 0 80px;
            background: var(--clr-bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center center;
            background-attachment: fixed;
            isolation: isolate;
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11,17,32,0.88) 30%, rgba(26,42,74,0.72) 70%, rgba(11,17,32,0.60) 100%);
            z-index: 0;
        }
        .page-hero::after {
            content: '';
            position: absolute;
            bottom: 0; left: 0; right: 0;
            height: 120px;
            background: linear-gradient(to top, var(--clr-bg), transparent);
            z-index: 1;
        }
        .page-hero .container { position: relative; z-index: 2; }
        .page-hero .badge { margin-bottom: var(--space-sm); }
        .page-hero h1 {
            color: var(--clr-text-inverse);
            font-weight: 700;
            max-width: 720px;
            line-height: 1.2;
            margin-bottom: var(--space-sm);
        }
        .page-hero h1 .highlight { color: var(--clr-accent); }
        .page-hero p {
            color: rgba(255,255,255,0.75);
            font-size: 1.1rem;
            max-width: 620px;
            line-height: 1.7;
            margin-bottom: var(--space-md);
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: var(--space-sm);
            margin-top: var(--space-md);
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            font-family: var(--font-sans);
            font-size: 0.95rem;
            font-weight: 600;
            border-radius: 50px;
            transition: all var(--transition);
            text-decoration: none;
            border: none;
            cursor: pointer;
        }
        .btn-primary {
            background: var(--clr-accent);
            color: var(--clr-primary-dark);
        }
        .btn-primary:hover {
            background: var(--clr-accent-hover);
            color: var(--clr-primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(240, 160, 48, 0.40);
        }
        .btn-outline {
            background: transparent;
            color: var(--clr-text-inverse);
            border: 1.5px solid rgba(255,255,255,0.25);
        }
        .btn-outline:hover {
            background: rgba(255,255,255,0.10);
            color: #fff;
            border-color: rgba(255,255,255,0.50);
            transform: translateY(-2px);
        }
        .btn-lg { padding: 14px 36px; font-size: 1.05rem; }
        .btn-sm { padding: 8px 18px; font-size: 0.85rem; }

        /* ===== Section 通用 ===== */
        .section-title-wrap { margin-bottom: var(--space-lg); }
        .section-title-wrap h2 { font-weight: 700; margin-bottom: var(--space-xs); }
        .section-title-wrap .subtitle { font-size: 1.05rem; color: var(--clr-text-light); max-width: 560px; }
        .section-title-wrap.text-center .subtitle { margin: 0 auto; }

        /* ===== 平台概览 ===== */
        .overview-section {
            background: var(--clr-bg);
        }
        .overview-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-lg);
            align-items: center;
        }
        .overview-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            position: relative;
        }
        .overview-image img {
            width: 100%;
            height: 400px;
            object-fit: cover;
            transition: transform 0.6s ease;
        }
        .overview-image:hover img { transform: scale(1.03); }
        .overview-content h3 { font-size: 1.6rem; font-weight: 700; margin-bottom: var(--space-sm); }
        .overview-content p { margin-bottom: var(--space-sm); }
        .overview-stats {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-md);
            margin-top: var(--space-md);
        }
        .stat-item {
            text-align: center;
            padding: var(--space-sm);
            background: var(--clr-bg-alt);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border-light);
        }
        .stat-item .num {
            font-size: 1.8rem;
            font-weight: 700;
            color: var(--clr-primary);
            display: block;
        }
        .stat-item .label {
            font-size: 0.85rem;
            color: var(--clr-text-lighter);
            margin-top: 2px;
        }

        /* ===== 使用流程 ===== */
        .steps-section {
            background: var(--clr-bg-alt);
        }
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--space-md);
        }
        .step-card {
            background: var(--clr-bg-card);
            border-radius: var(--radius-lg);
            padding: var(--space-lg) var(--space-md);
            text-align: center;
            border: 1px solid var(--clr-border-light);
            transition: all var(--transition);
            position: relative;
        }
        .step-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: var(--clr-accent);
        }
        .step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--clr-primary);
            color: #fff;
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: var(--space-sm);
        }
        .step-card h4 { font-size: 1.1rem; margin-bottom: var(--space-xs); }
        .step-card p { font-size: 0.9rem; color: var(--clr-text-light); margin-bottom: 0; }
        .step-card .step-icon { font-size: 1.8rem; color: var(--clr-accent); margin-bottom: var(--space-sm); }

        /* ===== 核心功能 ===== */
        .features-section { background: var(--clr-bg); }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-md);
        }
        .feature-card {
            background: var(--clr-bg-card);
            border-radius: var(--radius-lg);
            padding: var(--space-lg);
            border: 1px solid var(--clr-border-light);
            transition: all var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--clr-border);
        }
        .feature-card .icon-wrap {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 52px;
            height: 52px;
            border-radius: var(--radius-md);
            background: var(--clr-accent-light);
            color: var(--clr-accent);
            font-size: 1.4rem;
            margin-bottom: var(--space-sm);
        }
        .feature-card h4 { font-size: 1.1rem; margin-bottom: var(--space-xs); }
        .feature-card p { font-size: 0.92rem; color: var(--clr-text-light); margin-bottom: 0; }

        /* ===== 热门推荐 ===== */
        .showcase-section {
            background: var(--clr-bg-dark);
            color: var(--clr-text-inverse);
        }
        .showcase-section .section-title-wrap h2 { color: var(--clr-text-inverse); }
        .showcase-section .section-title-wrap .subtitle { color: rgba(255,255,255,0.6); }
        .showcase-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-md);
        }
        .showcase-card {
            background: rgba(255,255,255,0.06);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid rgba(255,255,255,0.08);
            transition: all var(--transition);
            backdrop-filter: blur(4px);
        }
        .showcase-card:hover {
            transform: translateY(-6px);
            border-color: rgba(240, 160, 48, 0.30);
            box-shadow: 0 16px 40px rgba(0,0,0,0.40);
        }
        .showcase-card .card-img {
            width: 100%;
            height: 200px;
            object-fit: cover;
        }
        .showcase-card .card-body {
            padding: var(--space-md);
        }
        .showcase-card .card-body h4 { color: #fff; font-size: 1.05rem; margin-bottom: 4px; }
        .showcase-card .card-body p { color: rgba(255,255,255,0.6); font-size: 0.88rem; margin-bottom: var(--space-sm); }
        .showcase-card .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }
        .showcase-card .card-tags span {
            padding: 2px 12px;
            border-radius: 50px;
            font-size: 0.75rem;
            background: rgba(255,255,255,0.10);
            color: rgba(255,255,255,0.7);
        }

        /* ===== FAQ ===== */
        .faq-section { background: var(--clr-bg-alt); }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: var(--space-sm);
        }
        .faq-item {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border-light);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--clr-border); }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: var(--space-md) var(--space-lg);
            font-weight: 600;
            font-size: 1.02rem;
            color: var(--clr-text);
            cursor: pointer;
            background: none;
            width: 100%;
            text-align: left;
            border: none;
            gap: var(--space-sm);
        }
        .faq-question i { color: var(--clr-accent); transition: transform var(--transition); font-size: 0.9rem; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 var(--space-lg);
        }
        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 0 var(--space-lg) var(--space-md);
        }
        .faq-answer p { font-size: 0.95rem; color: var(--clr-text-light); margin-bottom: 0; }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--clr-bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-attachment: fixed;
            position: relative;
            isolation: isolate;
            padding: var(--space-2xl) 0;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11,17,32,0.88) 40%, rgba(26,42,74,0.78) 100%);
            z-index: 0;
        }
        .cta-section .container { position: relative; z-index: 1; text-align: center; }
        .cta-section h2 { color: var(--clr-text-inverse); font-size: clamp(1.6rem, 4vw, 2.6rem); max-width: 700px; margin: 0 auto var(--space-sm); }
        .cta-section p { color: rgba(255,255,255,0.7); font-size: 1.05rem; max-width: 560px; margin: 0 auto var(--space-md); }
        .cta-section .btn { margin-top: var(--space-sm); }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--clr-bg-dark);
            color: rgba(255,255,255,0.7);
            padding: var(--space-xl) 0 var(--space-md);
            border-top: 1px solid rgba(255,255,255,0.05);
        }
        .site-footer .site-logo { color: var(--clr-text-inverse); margin-bottom: var(--space-sm); }
        .site-footer .site-logo span { color: var(--clr-accent); }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: var(--space-lg);
            margin-bottom: var(--space-lg);
        }
        .footer-brand p { font-size: 0.92rem; color: rgba(255,255,255,0.6); max-width: 320px; margin-top: var(--space-sm); }
        .footer-col h4 { color: #fff; font-size: 1rem; font-weight: 600; margin-bottom: var(--space-sm); }
        .footer-col ul { display: flex; flex-direction: column; gap: 8px; }
        .footer-col ul li a { color: rgba(255,255,255,0.6); font-size: 0.9rem; transition: color var(--transition); padding: 2px 0; display: inline-block; }
        .footer-col ul li a:hover { color: var(--clr-accent); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: var(--space-md);
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: var(--space-sm);
            font-size: 0.85rem;
            color: rgba(255,255,255,0.5);
        }
        .footer-bottom a { color: rgba(255,255,255,0.6); }
        .footer-bottom a:hover { color: var(--clr-accent); }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .overview-grid { grid-template-columns: 1fr; }
            .overview-image img { height: 300px; }
            .steps-grid { grid-template-columns: repeat(2, 1fr); }
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .showcase-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
        }

        @media (max-width: 768px) {
            .site-header .container { height: 64px; }
            .main-nav {
                position: fixed;
                top: 64px; left: 0; right: 0;
                background: rgba(11, 17, 32, 0.98);
                backdrop-filter: blur(20px);
                -webkit-backdrop-filter: blur(20px);
                flex-direction: column;
                padding: var(--space-md);
                gap: 4px;
                border-bottom: 1px solid rgba(255,255,255,0.06);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.35s ease;
                box-shadow: var(--shadow-xl);
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .main-nav a { width: 100%; padding: 12px 18px; font-size: 1rem; }
            .main-nav a.active::after { display: none; }
            .main-nav a.nav-cta { margin-left: 0; margin-top: 8px; justify-content: center; }
            .nav-toggle { display: flex; }

            .page-hero { padding: 110px 0 60px; }
            .page-hero h1 { font-size: 1.8rem; }
            .page-hero p { font-size: 1rem; }
            .hero-actions { flex-direction: column; align-items: flex-start; }
            .hero-actions .btn { width: 100%; justify-content: center; }

            .overview-image img { height: 220px; }
            .overview-stats { grid-template-columns: repeat(3, 1fr); gap: var(--space-sm); }
            .stat-item .num { font-size: 1.4rem; }

            .steps-grid { grid-template-columns: 1fr; }
            .features-grid { grid-template-columns: 1fr; }
            .showcase-grid { grid-template-columns: 1fr; }
            .showcase-card .card-img { height: 180px; }

            .footer-grid { grid-template-columns: 1fr; gap: var(--space-md); }
            .footer-bottom { flex-direction: column; text-align: center; }

            .faq-question { padding: var(--space-sm) var(--space-md); font-size: 0.95rem; }
            .faq-answer { padding: 0 var(--space-md); }
            .faq-item.open .faq-answer { padding: 0 var(--space-md) var(--space-sm); }

            .section-padding { padding: var(--space-lg) 0; }
            .section-padding-sm { padding: var(--space-md) 0; }
            .cta-section { padding: var(--space-xl) 0; }
        }

        @media (max-width: 520px) {
            .page-hero h1 { font-size: 1.5rem; }
            .overview-stats { grid-template-columns: 1fr; }
            .stat-item { padding: var(--space-sm); }
            .showcase-card .card-img { height: 160px; }
            .footer-grid { gap: var(--space-sm); }
            .btn-lg { padding: 12px 24px; font-size: 0.95rem; }
        }

        /* ===== 动画 ===== */
        @keyframes fadeUp {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        .animate-fade-up { animation: fadeUp 0.6s ease forwards; }
        .delay-1 { animation-delay: 0.1s; }
        .delay-2 { animation-delay: 0.2s; }
        .delay-3 { animation-delay: 0.3s; }
        .delay-4 { animation-delay: 0.4s; }

/* roulang page: article */
/* ============================================
           DESIGN TOKENS & RESET
           ============================================ */
        :root {
            --color-primary: #1e40af;
            --color-primary-dark: #1e3a8a;
            --color-primary-light: #3b82f6;
            --color-accent: #f59e0b;
            --color-accent-dark: #d97706;
            --color-accent-light: #fbbf24;
            --color-bg: #f8f9fc;
            --color-bg-card: #ffffff;
            --color-bg-dark: #0b0e1a;
            --color-bg-dark-alt: #111827;
            --color-bg-dark-card: #1a1f2e;
            --color-text: #1f2937;
            --color-text-light: #4b5563;
            --color-text-muted: #9ca3af;
            --color-text-inverse: #f9fafb;
            --color-border: #e5e7eb;
            --color-border-light: #f3f4f6;
            --color-success: #10b981;
            --color-error: #ef4444;
            --color-warning: #f59e0b;
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --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(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
            --shadow-lg: 0 10px 30px rgba(0,0,0,0.08), 0 4px 8px rgba(0,0,0,0.04);
            --shadow-xl: 0 20px 50px rgba(0,0,0,0.12);
            --shadow-glow: 0 0 20px rgba(59,130,246,0.15);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
            --spacing-xs: 0.25rem;
            --spacing-sm: 0.5rem;
            --spacing-md: 1rem;
            --spacing-lg: 2rem;
            --spacing-xl: 3rem;
            --spacing-2xl: 5rem;
            --max-width: 1200px;
            --header-height: 72px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--color-text);
            background: var(--color-bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--color-primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--color-primary-dark); }
        a:focus-visible { outline: 2px solid var(--color-primary-light); outline-offset: 2px; border-radius: 2px; }
        button { cursor: pointer; font-family: inherit; border: none; background: none; }
        button:focus-visible { outline: 2px solid var(--color-primary-light); outline-offset: 2px; border-radius: var(--radius-sm); }
        input, textarea { font-family: inherit; font-size: 1rem; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; color: var(--color-text); font-weight: 700; }
        h1 { font-size: 2.5rem; }
        h2 { font-size: 2rem; }
        h3 { font-size: 1.5rem; }
        h4 { font-size: 1.25rem; }
        p { margin-bottom: 1rem; }
        p:last-child { margin-bottom: 0; }

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

        /* ============================================
           HEADER / NAVIGATION
           ============================================ */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-height);
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--color-border);
            z-index: 1000;
            transition: box-shadow var(--transition);
        }
        .site-header.scrolled { box-shadow: var(--shadow-md); }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }

        .site-logo {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--color-text);
            letter-spacing: -0.02em;
            transition: opacity var(--transition);
        }
        .site-logo:hover { opacity: 0.85; color: var(--color-text); }
        .site-logo .logo-icon {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            background: var(--color-primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-size: 1.2rem;
            font-weight: 700;
        }
        .site-logo span { color: var(--color-primary); }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 0.25rem;
        }
        .main-nav a {
            position: relative;
            padding: 0.5rem 1.1rem;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--color-text-light);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
        }
        .main-nav a:hover {
            color: var(--color-primary);
            background: rgba(30,64,175,0.06);
        }
        .main-nav a.active {
            color: var(--color-primary);
            font-weight: 600;
        }
        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--color-primary);
            border-radius: 2px;
        }
        .main-nav a.nav-cta {
            background: var(--color-primary);
            color: #fff;
            padding: 0.5rem 1.4rem;
            border-radius: var(--radius-md);
            font-weight: 600;
            margin-left: 0.5rem;
            box-shadow: var(--shadow-sm);
        }
        .main-nav a.nav-cta:hover {
            background: var(--color-primary-dark);
            color: #fff;
            transform: translateY(-1px);
            box-shadow: var(--shadow-md);
        }
        .main-nav a.nav-cta i { margin-right: 0.35rem; font-size: 0.85rem; }

        .nav-toggle {
            display: none;
            flex-direction: column;
            justify-content: center;
            align-items: center;
            width: 44px;
            height: 44px;
            border-radius: var(--radius-sm);
            background: transparent;
            transition: background var(--transition);
        }
        .nav-toggle:hover { background: rgba(0,0,0,0.05); }
        .nav-toggle span {
            display: block;
            width: 22px;
            height: 2px;
            background: var(--color-text);
            border-radius: 2px;
            margin: 3px 0;
            transition: all 0.3s ease;
        }
        .nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(4px, 4px); }
        .nav-toggle.active span:nth-child(2) { opacity: 0; }
        .nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(4px, -4px); }

        /* ============================================
           HERO / BANNER
           ============================================ */
        .article-hero {
            position: relative;
            margin-top: var(--header-height);
            min-height: 380px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: var(--color-bg-dark);
            overflow: hidden;
        }
        .article-hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            transform: scale(1.02);
            transition: transform 8s ease;
        }
        .article-hero:hover .article-hero-bg { transform: scale(1.08); }
        .article-hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11,14,26,0.88) 0%, rgba(17,24,39,0.75) 100%);
        }
        .article-hero .container {
            position: relative;
            z-index: 2;
            padding-top: var(--spacing-xl);
            padding-bottom: var(--spacing-xl);
        }
        .article-hero-category {
            display: inline-block;
            padding: 0.3rem 1rem;
            background: rgba(245,158,11,0.18);
            color: var(--color-accent-light);
            font-size: 0.85rem;
            font-weight: 600;
            border-radius: 50px;
            letter-spacing: 0.03em;
            margin-bottom: 1.2rem;
            border: 1px solid rgba(245,158,11,0.25);
        }
        .article-hero h1 {
            font-size: 2.8rem;
            font-weight: 800;
            color: #fff;
            max-width: 850px;
            margin: 0 auto 1rem;
            line-height: 1.25;
            letter-spacing: -0.02em;
            text-shadow: 0 2px 10px rgba(0,0,0,0.2);
        }
        .article-hero-meta {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-wrap: wrap;
            gap: 1.2rem 2rem;
            color: rgba(255,255,255,0.7);
            font-size: 0.9rem;
        }
        .article-hero-meta i { margin-right: 0.4rem; color: var(--color-accent); }
        .article-hero-meta span { display: inline-flex; align-items: center; }

        /* ============================================
           ARTICLE MAIN
           ============================================ */
        .article-main {
            padding: var(--spacing-2xl) 0;
        }

        .article-layout {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: var(--spacing-xl);
            align-items: start;
        }

        /* --- Article Body --- */
        .article-body {
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: var(--spacing-xl);
            border: 1px solid var(--color-border);
        }
        .article-body .article-featured-image {
            width: 100%;
            border-radius: var(--radius-md);
            margin-bottom: var(--spacing-lg);
            box-shadow: var(--shadow-sm);
        }
        .article-body .article-content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--color-text);
        }
        .article-body .article-content h2 {
            font-size: 1.6rem;
            margin-top: 2rem;
            margin-bottom: 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid var(--color-border-light);
        }
        .article-body .article-content h3 {
            font-size: 1.3rem;
            margin-top: 1.6rem;
            margin-bottom: 0.8rem;
        }
        .article-body .article-content p {
            margin-bottom: 1.2rem;
        }
        .article-body .article-content ul,
        .article-body .article-content ol {
            margin-bottom: 1.2rem;
            padding-left: 1.5rem;
        }
        .article-body .article-content ul li { list-style: disc; margin-bottom: 0.4rem; }
        .article-body .article-content ol li { list-style: decimal; margin-bottom: 0.4rem; }
        .article-body .article-content a { color: var(--color-primary); font-weight: 500; text-decoration: underline; text-underline-offset: 2px; }
        .article-body .article-content a:hover { color: var(--color-primary-dark); }
        .article-body .article-content blockquote {
            border-left: 4px solid var(--color-primary-light);
            background: var(--color-bg);
            padding: 1rem 1.5rem;
            margin: 1.5rem 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--color-text-light);
            font-style: italic;
        }
        .article-body .article-content img {
            border-radius: var(--radius-md);
            margin: 1.5rem auto;
            box-shadow: var(--shadow-sm);
        }
        .article-body .article-content code {
            background: var(--color-bg-dark);
            color: var(--color-accent-light);
            padding: 0.15rem 0.5rem;
            border-radius: 4px;
            font-size: 0.9rem;
            font-family: var(--font-mono);
        }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem;
            margin-top: var(--spacing-lg);
            padding-top: var(--spacing-lg);
            border-top: 1px solid var(--color-border);
        }
        .article-tags .tag {
            display: inline-block;
            padding: 0.3rem 1rem;
            background: var(--color-bg);
            color: var(--color-text-light);
            font-size: 0.85rem;
            border-radius: 50px;
            border: 1px solid var(--color-border);
            transition: all var(--transition);
        }
        .article-tags .tag:hover {
            background: var(--color-primary);
            color: #fff;
            border-color: var(--color-primary);
        }

        .article-share {
            display: flex;
            align-items: center;
            gap: 0.8rem;
            margin-top: var(--spacing-md);
        }
        .article-share span { font-size: 0.9rem; color: var(--color-text-muted); font-weight: 500; }
        .article-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background: var(--color-bg);
            color: var(--color-text-light);
            border: 1px solid var(--color-border);
            transition: all var(--transition);
        }
        .article-share a:hover {
            background: var(--color-primary);
            color: #fff;
            border-color: var(--color-primary);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        /* --- Sidebar --- */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: var(--spacing-lg);
        }
        .sidebar-card {
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-sm);
            padding: var(--spacing-lg);
            border: 1px solid var(--color-border);
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: var(--spacing-md);
            padding-bottom: var(--spacing-sm);
            border-bottom: 2px solid var(--color-border-light);
            color: var(--color-text);
        }
        .sidebar-card h3 i { color: var(--color-primary); margin-right: 0.5rem; }
        .sidebar-list li {
            padding: 0.6rem 0;
            border-bottom: 1px solid var(--color-border-light);
        }
        .sidebar-list li:last-child { border-bottom: none; }
        .sidebar-list a {
            display: flex;
            align-items: flex-start;
            gap: 0.8rem;
            color: var(--color-text-light);
            font-size: 0.92rem;
            line-height: 1.5;
            transition: color var(--transition);
        }
        .sidebar-list a:hover { color: var(--color-primary); }
        .sidebar-list a .list-icon {
            flex-shrink: 0;
            width: 28px;
            height: 28px;
            background: rgba(30,64,175,0.08);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--color-primary);
            font-size: 0.8rem;
        }
        .sidebar-cta {
            text-align: center;
        }
        .sidebar-cta p {
            font-size: 0.95rem;
            color: var(--color-text-light);
            margin-bottom: 1rem;
        }
        .sidebar-cta .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 1.8rem;
            background: var(--color-primary);
            color: #fff;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .sidebar-cta .btn:hover {
            background: var(--color-primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* ============================================
           ARTICLE NAV (prev/next)
           ============================================ */
        .article-nav-section {
            padding: 0 0 var(--spacing-2xl);
        }
        .article-nav-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--spacing-lg);
        }
        .article-nav-item {
            display: flex;
            flex-direction: column;
            padding: var(--spacing-lg);
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .article-nav-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: var(--color-primary-light);
        }
        .article-nav-item .nav-label {
            font-size: 0.8rem;
            color: var(--color-text-muted);
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 0.4rem;
        }
        .article-nav-item .nav-title {
            font-size: 1rem;
            font-weight: 600;
            color: var(--color-text);
            line-height: 1.4;
        }
        .article-nav-item.next { text-align: right; align-items: flex-end; }
        .article-nav-item.next .nav-label i { margin-left: 0.3rem; }
        .article-nav-item.prev .nav-label i { margin-right: 0.3rem; }

        /* ============================================
           RELATED POSTS
           ============================================ */
        .related-section {
            padding: var(--spacing-2xl) 0;
            background: var(--color-bg);
        }
        .related-section .section-title {
            text-align: center;
            margin-bottom: var(--spacing-xl);
        }
        .related-section .section-title h2 {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--color-text);
        }
        .related-section .section-title p {
            color: var(--color-text-light);
            margin-top: 0.5rem;
            font-size: 1rem;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--spacing-lg);
        }
        .related-card {
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .related-card:hover {
            box-shadow: var(--shadow-lg);
            transform: translateY(-4px);
            border-color: var(--color-border);
        }
        .related-card .card-image {
            width: 100%;
            height: 180px;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .related-card:hover .card-image { transform: scale(1.04); }
        .related-card .card-body {
            padding: var(--spacing-md) var(--spacing-lg) var(--spacing-lg);
        }
        .related-card .card-category {
            display: inline-block;
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--color-primary);
            background: rgba(30,64,175,0.08);
            padding: 0.15rem 0.7rem;
            border-radius: 50px;
            margin-bottom: 0.5rem;
        }
        .related-card .card-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--color-text);
            line-height: 1.4;
            margin-bottom: 0.5rem;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-title a { color: inherit; }
        .related-card .card-title a:hover { color: var(--color-primary); }
        .related-card .card-meta {
            font-size: 0.83rem;
            color: var(--color-text-muted);
            display: flex;
            align-items: center;
            gap: 1rem;
        }
        .related-card .card-meta i { margin-right: 0.3rem; }

        /* ============================================
           CTA SECTION
           ============================================ */
        .cta-section {
            padding: var(--spacing-2xl) 0;
            background: var(--color-bg-dark);
            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: 0.08;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 0.8rem;
        }
        .cta-section p {
            font-size: 1.1rem;
            color: rgba(255,255,255,0.7);
            max-width: 600px;
            margin: 0 auto var(--spacing-lg);
        }
        .cta-section .btn-group {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: var(--spacing-md);
            flex-wrap: wrap;
        }
        .cta-section .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            padding: 0.9rem 2.4rem;
            background: var(--color-accent);
            color: #1f2937;
            border-radius: var(--radius-md);
            font-weight: 700;
            font-size: 1.05rem;
            transition: all var(--transition);
            box-shadow: 0 4px 15px rgba(245,158,11,0.3);
        }
        .cta-section .btn-primary:hover {
            background: var(--color-accent-dark);
            color: #1f2937;
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(245,158,11,0.4);
        }
        .cta-section .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 0.6rem;
            padding: 0.9rem 2.4rem;
            background: transparent;
            color: #fff;
            border: 2px solid rgba(255,255,255,0.25);
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition);
        }
        .cta-section .btn-outline:hover {
            background: rgba(255,255,255,0.1);
            border-color: rgba(255,255,255,0.5);
            color: #fff;
            transform: translateY(-2px);
        }

        /* ============================================
           FOOTER
           ============================================ */
        .site-footer {
            background: var(--color-bg-dark-alt);
            padding: var(--spacing-2xl) 0 var(--spacing-lg);
            color: rgba(255,255,255,0.7);
            border-top: 1px solid rgba(255,255,255,0.06);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: var(--spacing-xl);
            margin-bottom: var(--spacing-xl);
        }
        .footer-brand .site-logo {
            color: #fff;
            margin-bottom: var(--spacing-md);
            display: inline-flex;
        }
        .footer-brand .site-logo span { color: var(--color-accent); }
        .footer-brand p {
            font-size: 0.95rem;
            line-height: 1.7;
            color: rgba(255,255,255,0.55);
            max-width: 320px;
        }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: var(--spacing-md);
            letter-spacing: 0.02em;
        }
        .footer-col ul li { margin-bottom: 0.6rem; }
        .footer-col ul a {
            font-size: 0.9rem;
            color: rgba(255,255,255,0.55);
            transition: color var(--transition);
        }
        .footer-col ul a:hover { color: var(--color-accent); }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: var(--spacing-md);
            padding-top: var(--spacing-lg);
            border-top: 1px solid rgba(255,255,255,0.08);
            font-size: 0.85rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.6); }
        .footer-bottom a:hover { color: var(--color-accent); }

        /* ============================================
           NOT FOUND STATE
           ============================================ */
        .not-found-box {
            text-align: center;
            padding: var(--spacing-2xl) var(--spacing-lg);
            background: var(--color-bg-card);
            border-radius: var(--radius-lg);
            border: 1px solid var(--color-border);
            box-shadow: var(--shadow-sm);
        }
        .not-found-box .nf-icon {
            font-size: 3rem;
            color: var(--color-text-muted);
            margin-bottom: var(--spacing-md);
        }
        .not-found-box h2 {
            font-size: 1.6rem;
            color: var(--color-text);
            margin-bottom: 0.5rem;
        }
        .not-found-box p {
            color: var(--color-text-light);
            margin-bottom: var(--spacing-lg);
        }
        .not-found-box .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.7rem 2rem;
            background: var(--color-primary);
            color: #fff;
            border-radius: var(--radius-md);
            font-weight: 600;
            transition: all var(--transition);
        }
        .not-found-box .btn-back:hover {
            background: var(--color-primary-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
        }

        /* ============================================
           RESPONSIVE
           ============================================ */
        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-lg);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: var(--spacing-lg);
            }
            .footer-brand { grid-column: 1 / -1; }
        }

        @media (max-width: 768px) {
            :root { --header-height: 64px; }

            .main-nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                width: 100%;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(18px);
                -webkit-backdrop-filter: blur(18px);
                flex-direction: column;
                padding: var(--spacing-md) var(--spacing-lg);
                border-bottom: 1px solid var(--color-border);
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                pointer-events: none;
            }
            .main-nav.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .main-nav a {
                width: 100%;
                padding: 0.8rem 1rem;
                font-size: 1.05rem;
                border-radius: var(--radius-sm);
            }
            .main-nav a.active::after { display: none; }
            .main-nav a.active { background: rgba(30,64,175,0.08); }
            .main-nav a.nav-cta {
                margin-left: 0;
                margin-top: 0.5rem;
                text-align: center;
            }
            .nav-toggle { display: flex; }

            .article-hero { min-height: 280px; }
            .article-hero h1 { font-size: 1.8rem; }
            .article-hero-meta { gap: 0.8rem 1.2rem; font-size: 0.85rem; }

            .article-body { padding: var(--spacing-lg); }
            .article-body .article-content { font-size: 1rem; }

            .article-sidebar { grid-template-columns: 1fr; }

            .article-nav-grid { grid-template-columns: 1fr; }

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

            .cta-section h2 { font-size: 1.5rem; }
            .cta-section p { font-size: 1rem; }

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

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

            .article-hero h1 { font-size: 1.4rem; }
            .article-hero { min-height: 220px; }

            .article-body { padding: var(--spacing-md); }
            .article-body .article-content { font-size: 0.95rem; }

            .related-card .card-image { height: 140px; }

            .cta-section .btn-group { flex-direction: column; width: 100%; }
            .cta-section .btn-primary,
            .cta-section .btn-outline { width: 100%; justify-content: center; }

            .sidebar-card { padding: var(--spacing-md); }
        }

        /* ============================================
           UTILITY
           ============================================ */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0,0,0,0);
            border: 0;
        }
        .text-center { text-align: center; }
        .mt-1 { margin-top: var(--spacing-md); }
        .mt-2 { margin-top: var(--spacing-lg); }
        .mb-1 { margin-bottom: var(--spacing-md); }
        .mb-2 { margin-bottom: var(--spacing-lg); }