/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0f1a3a;
            --primary-light: #1a2d5e;
            --primary-dark: #0a1028;
            --secondary: #d4a54a;
            --secondary-light: #e8c06a;
            --secondary-dark: #b8892e;
            --accent: #f05a28;
            --accent-light: #ff7a4a;
            --bg: #ffffff;
            --bg-alt: #f4f6fc;
            --bg-dark: #0a1028;
            --text: #161b2b;
            --text-light: #5a6378;
            --text-white: #f0f2f8;
            --border: #e2e5ed;
            --border-light: #f0f2f8;
            --radius-sm: 8px;
            --radius: 14px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(15, 26, 58, 0.06);
            --shadow: 0 6px 28px rgba(15, 26, 58, 0.08);
            --shadow-lg: 0 12px 48px rgba(15, 26, 58, 0.12);
            --shadow-glow: 0 4px 24px rgba(212, 165, 74, 0.25);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --max-width: 1200px;
            --header-top: 40px;
            --header-nav: 72px;
            --hero-min-height: 580px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.65;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; border: 0; }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        a:focus-visible, button:focus-visible, input:focus-visible { outline: 3px solid var(--secondary); outline-offset: 2px; }
        button { font-family: var(--font); cursor: pointer; border: none; background: none; transition: all var(--transition); }
        input, textarea { font-family: var(--font); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 10px 16px; font-size: 15px; background: var(--bg); color: var(--text); transition: border var(--transition); }
        input:focus, textarea:focus { border-color: var(--secondary); box-shadow: 0 0 0 3px rgba(212, 165, 74, 0.15); outline: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.25; font-weight: 700; color: var(--text); }
        h1 { font-size: clamp(2rem, 4.5vw, 3.4rem); }
        h2 { font-size: clamp(1.6rem, 3.2vw, 2.4rem); }
        h3 { font-size: clamp(1.2rem, 2vw, 1.6rem); }
        h4 { font-size: 1.15rem; }
        p { margin-bottom: 0.8em; }

        /* ===== 容器 ===== */
        .container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
        .container-narrow { max-width: 900px; }

        /* ===== 顶部信息条 ===== */
        .topbar {
            background: var(--bg-dark);
            color: var(--text-white);
            font-size: 13px;
            padding: 8px 0;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .topbar .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 6px 20px; }
        .topbar-left { display: flex; align-items: center; gap: 16px; }
        .topbar-left i { color: var(--secondary); font-size: 12px; margin-right: 4px; }
        .topbar-left span { opacity: 0.8; }
        .topbar-right { display: flex; align-items: center; gap: 12px; }
        .topbar-right a { color: var(--text-white); opacity: 0.75; font-size: 13px; transition: opacity var(--transition); }
        .topbar-right a:hover { opacity: 1; color: var(--secondary); }
        .topbar-right .topbar-cta { background: var(--secondary); color: var(--primary-dark); padding: 2px 14px; border-radius: 20px; font-weight: 600; font-size: 12px; opacity: 1; }
        .topbar-right .topbar-cta:hover { background: var(--secondary-light); color: var(--primary-dark); }

        /* ===== 导航 ===== */
        .header-nav {
            background: var(--bg);
            border-bottom: 1px solid var(--border-light);
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 1px 6px rgba(15,26,58,0.04);
            transition: box-shadow var(--transition);
        }
        .header-nav.scrolled { box-shadow: var(--shadow); }
        .header-nav .container { display: flex; justify-content: space-between; align-items: center; height: var(--header-nav); }
        .site-logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.4rem; color: var(--primary); }
        .site-logo .logo-icon { width: 40px; height: 40px; background: linear-gradient(135deg, var(--primary), var(--primary-light)); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; color: var(--secondary); font-size: 1.3rem; }
        .site-logo span { background: linear-gradient(135deg, var(--primary), var(--primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .site-logo .logo-sub { font-size: 0.65rem; font-weight: 400; color: var(--text-light); -webkit-text-fill-color: var(--text-light); background: none; display: block; line-height: 1.1; }
        .nav-list { display: flex; align-items: center; gap: 4px; }
        .nav-list a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-light);
            transition: all var(--transition);
            position: relative;
        }
        .nav-list a:hover { color: var(--primary); background: var(--bg-alt); }
        .nav-list a.active { color: var(--primary); background: var(--bg-alt); font-weight: 600; }
        .nav-list a.active::after { content: ''; position: absolute; bottom: -2px; left: 50%; transform: translateX(-50%); width: 20px; height: 3px; background: var(--secondary); border-radius: 4px; }
        .nav-actions { display: flex; align-items: center; gap: 12px; }
        .nav-actions .btn-nav { padding: 8px 20px; border-radius: var(--radius-sm); font-weight: 600; font-size: 14px; }
        .btn-login { color: var(--primary); border: 1px solid var(--border); }
        .btn-login:hover { border-color: var(--secondary); color: var(--primary); background: rgba(212,165,74,0.06); }
        .btn-register { background: linear-gradient(135deg, var(--primary), var(--primary-light)); color: #fff; }
        .btn-register:hover { background: var(--primary-light); transform: translateY(-1px); box-shadow: var(--shadow-sm); }
        .mobile-toggle { display: none; font-size: 1.5rem; color: var(--primary); padding: 6px; border-radius: var(--radius-sm); }
        .mobile-toggle:hover { background: var(--bg-alt); }

        /* ===== 移动端导航 ===== */
        @media (max-width: 820px) {
            .nav-list { display: none; }
            .nav-actions .btn-nav { display: none; }
            .mobile-toggle { display: block; }
            .header-nav.mobile-open .nav-list {
                display: flex; flex-direction: column; position: absolute; top: var(--header-nav); left: 0; right: 0;
                background: var(--bg); border-bottom: 1px solid var(--border); padding: 12px 24px 20px;
                gap: 2px; box-shadow: var(--shadow);
            }
            .header-nav.mobile-open .nav-list a { padding: 12px 16px; width: 100%; border-radius: var(--radius-sm); }
            .header-nav.mobile-open .nav-list a.active::after { display: none; }
            .header-nav.mobile-open .nav-list a.active { background: var(--bg-alt); }
            .header-nav.mobile-open .nav-actions .btn-nav { display: inline-flex; }
        }
        @media (max-width: 520px) {
            .topbar-left span:not(.topbar-domain) { display: none; }
            .topbar-right a:not(.topbar-cta) { display: none; }
            .site-logo { font-size: 1.15rem; }
            .site-logo .logo-icon { width: 34px; height: 34px; font-size: 1rem; }
        }

        /* ===== Hero ===== */
        .hero {
            min-height: var(--hero-min-height);
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center center;
            background-repeat: no-repeat;
            position: relative;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,26,58,0.82) 0%, rgba(10,16,40,0.65) 70%, rgba(15,26,58,0.5) 100%);
            z-index: 1;
        }
        .hero::after {
            content: '';
            position: absolute;
            bottom: 0; left: 0; right: 0;
            height: 120px;
            background: linear-gradient(to top, var(--bg), transparent);
            z-index: 2;
        }
        .hero .container { position: relative; z-index: 3; padding: 60px 24px; }
        .hero-content { max-width: 700px; }
        .hero-badge {
            display: inline-flex; align-items: center; gap: 8px;
            background: rgba(212,165,74,0.18);
            border: 1px solid rgba(212,165,74,0.25);
            color: var(--secondary-light);
            padding: 6px 18px;
            border-radius: 40px;
            font-size: 13px;
            font-weight: 500;
            margin-bottom: 20px;
            backdrop-filter: blur(6px);
        }
        .hero-badge i { font-size: 12px; }
        .hero-title {
            color: #fff;
            font-size: clamp(2.2rem, 5vw, 3.8rem);
            font-weight: 800;
            line-height: 1.1;
            margin-bottom: 16px;
        }
        .hero-title .highlight { color: var(--secondary); }
        .hero-desc {
            color: rgba(255,255,255,0.8);
            font-size: clamp(1rem, 1.6vw, 1.2rem);
            line-height: 1.7;
            margin-bottom: 32px;
            max-width: 580px;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 14px; }
        .hero-actions .btn-hero {
            padding: 14px 34px;
            border-radius: 50px;
            font-weight: 700;
            font-size: 16px;
            display: inline-flex;
            align-items: center;
            gap: 10px;
            transition: all var(--transition);
        }
        .btn-hero-primary { background: var(--secondary); color: var(--primary-dark); }
        .btn-hero-primary:hover { background: var(--secondary-light); transform: translateY(-2px); box-shadow: var(--shadow-glow); }
        .btn-hero-secondary { background: rgba(255,255,255,0.1); color: #fff; border: 1px solid rgba(255,255,255,0.2); backdrop-filter: blur(6px); }
        .btn-hero-secondary:hover { background: rgba(255,255,255,0.18); transform: translateY(-2px); }
        .hero-stats { display: flex; gap: 30px; margin-top: 40px; flex-wrap: wrap; }
        .hero-stat-item { display: flex; flex-direction: column; }
        .hero-stat-number { font-size: 1.6rem; font-weight: 800; color: #fff; }
        .hero-stat-number i { color: var(--secondary); font-size: 1rem; margin-right: 4px; }
        .hero-stat-label { font-size: 13px; color: rgba(255,255,255,0.6); margin-top: 2px; }

        @media (max-width: 640px) {
            .hero { --hero-min-height: 460px; }
            .hero .container { padding: 40px 20px; }
            .hero-stats { gap: 20px; }
            .hero-stat-number { font-size: 1.3rem; }
            .hero-actions .btn-hero { padding: 12px 24px; font-size: 14px; }
        }

        /* ===== 通用板块 ===== */
        .section { padding: 80px 0; }
        .section-alt { background: var(--bg-alt); }
        .section-dark { background: var(--bg-dark); color: var(--text-white); }
        .section-header { text-align: center; margin-bottom: 48px; max-width: 700px; margin-left: auto; margin-right: auto; }
        .section-header h2 { margin-bottom: 12px; }
        .section-header p { color: var(--text-light); font-size: 1.05rem; }
        .section-dark .section-header h2 { color: #fff; }
        .section-dark .section-header p { color: rgba(255,255,255,0.7); }
        .section-label {
            display: inline-block;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 2px;
            text-transform: uppercase;
            color: var(--secondary);
            background: rgba(212,165,74,0.1);
            padding: 4px 14px;
            border-radius: 30px;
            margin-bottom: 12px;
        }

        @media (max-width: 768px) { .section { padding: 56px 0; } }

        /* ===== 平台简介 ===== */
        .intro-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
        .intro-image { border-radius: var(--radius-lg); overflow: hidden; box-shadow: var(--shadow-lg); }
        .intro-image img { width: 100%; height: 100%; object-fit: cover; min-height: 320px; }
        .intro-text h2 { margin-bottom: 16px; }
        .intro-text p { color: var(--text-light); margin-bottom: 16px; }
        .intro-features { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 20px; }
        .intro-feature-item { display: flex; align-items: center; gap: 10px; font-size: 14px; font-weight: 500; }
        .intro-feature-item i { color: var(--secondary); font-size: 14px; width: 20px; text-align: center; }

        @media (max-width: 820px) {
            .intro-grid { grid-template-columns: 1fr; gap: 32px; }
            .intro-image { order: -1; }
            .intro-image img { min-height: 240px; }
            .intro-features { grid-template-columns: 1fr; }
        }

        /* ===== 分类入口 ===== */
        .category-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .category-card {
            background: var(--bg);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: all var(--transition);
            cursor: pointer;
            display: block;
        }
        .category-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
        .category-card-image { position: relative; height: 180px; overflow: hidden; }
        .category-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
        .category-card:hover .category-card-image img { transform: scale(1.06); }
        .category-card-image .overlay {
            position: absolute; inset: 0;
            background: linear-gradient(to top, rgba(15,26,58,0.6), transparent);
        }
        .category-card-tag {
            position: absolute; top: 14px; left: 14px;
            background: var(--secondary); color: var(--primary-dark);
            padding: 4px 14px; border-radius: 30px;
            font-size: 12px; font-weight: 600;
        }
        .category-card-body { padding: 20px 22px 24px; }
        .category-card-body h3 { font-size: 1.1rem; margin-bottom: 6px; }
        .category-card-body p { color: var(--text-light); font-size: 14px; margin-bottom: 0; }
        .category-card-body .card-link { display: inline-flex; align-items: center; gap: 6px; color: var(--secondary); font-weight: 600; font-size: 13px; margin-top: 12px; }
        .category-card-body .card-link i { font-size: 12px; transition: transform var(--transition); }
        .category-card:hover .card-link i { transform: translateX(4px); }

        @media (max-width: 820px) {
            .category-grid { grid-template-columns: repeat(2, 1fr); gap: 20px; }
        }
        @media (max-width: 520px) {
            .category-grid { grid-template-columns: 1fr; }
            .category-card-image { height: 160px; }
        }

        /* ===== 最新资讯 ===== */
        .news-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
        .news-card {
            background: var(--bg);
            border-radius: var(--radius);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
        .news-card-image { height: 190px; overflow: hidden; position: relative; }
        .news-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s; }
        .news-card:hover .news-card-image img { transform: scale(1.05); }
        .news-card-category {
            position: absolute; bottom: 12px; left: 12px;
            background: var(--primary); color: #fff;
            padding: 3px 12px; border-radius: 20px;
            font-size: 11px; font-weight: 500;
        }
        .news-card-body { padding: 18px 22px 22px; flex: 1; display: flex; flex-direction: column; }
        .news-card-body h3 { font-size: 1.05rem; margin-bottom: 8px; line-height: 1.4; }
        .news-card-body p { color: var(--text-light); font-size: 14px; flex: 1; margin-bottom: 12px; }
        .news-card-meta { display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--text-light); border-top: 1px solid var(--border-light); padding-top: 12px; }
        .news-card-meta .news-date i { margin-right: 4px; }
        .news-card-meta .news-readmore { color: var(--secondary); font-weight: 600; }
        .news-empty { grid-column: 1 / -1; text-align: center; padding: 40px 20px; color: var(--text-light); background: var(--bg-alt); border-radius: var(--radius); }

        @media (max-width: 720px) {
            .news-grid { grid-template-columns: 1fr; }
            .news-card-image { height: 170px; }
        }

        /* ===== 平台优势 / 数据 ===== */
        .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
        .stat-card {
            text-align: center;
            background: var(--bg);
            border-radius: var(--radius);
            padding: 32px 20px;
            border: 1px solid var(--border-light);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
        }
        .stat-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
        .stat-card .stat-icon { font-size: 2rem; color: var(--secondary); margin-bottom: 12px; }
        .stat-card .stat-number { font-size: 2rem; font-weight: 800; color: var(--primary); }
        .stat-card .stat-label { color: var(--text-light); font-size: 14px; margin-top: 6px; }

        @media (max-width: 820px) {
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
        }
        @media (max-width: 520px) {
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
            .stat-card { padding: 24px 14px; }
            .stat-card .stat-number { font-size: 1.5rem; }
        }

        /* ===== 使用流程 ===== */
        .steps-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; position: relative; }
        .steps-grid::before {
            content: '';
            position: absolute; top: 52px; left: 15%; right: 15%;
            height: 2px;
            background: linear-gradient(to right, var(--border), var(--secondary), var(--border));
            opacity: 0.3;
        }
        .step-item { text-align: center; position: relative; }
        .step-number {
            width: 60px; height: 60px; border-radius: 50%;
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.4rem; font-weight: 800;
            margin: 0 auto 18px;
            position: relative;
            z-index: 2;
            box-shadow: 0 4px 16px rgba(15,26,58,0.2);
        }
        .step-item h3 { font-size: 1.1rem; margin-bottom: 8px; }
        .step-item p { color: var(--text-light); font-size: 14px; margin-bottom: 0; }

        @media (max-width: 720px) {
            .steps-grid { grid-template-columns: 1fr; gap: 28px; }
            .steps-grid::before { display: none; }
            .step-number { width: 50px; height: 50px; font-size: 1.1rem; }
        }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; }
        .faq-item {
            border: 1px solid var(--border);
            border-radius: var(--radius);
            margin-bottom: 12px;
            background: var(--bg);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--secondary); }
        .faq-question {
            padding: 18px 24px;
            display: flex; justify-content: space-between; align-items: center;
            font-weight: 600; font-size: 15px;
            cursor: pointer;
            user-select: none;
            transition: background var(--transition);
        }
        .faq-question:hover { background: var(--bg-alt); }
        .faq-question i { color: var(--text-light); transition: transform var(--transition); font-size: 14px; }
        .faq-item.active .faq-question i { transform: rotate(180deg); color: var(--secondary); }
        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: all 0.35s ease;
            color: var(--text-light);
            font-size: 14px;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer { padding: 0 24px 20px; max-height: 400px; }

        @media (max-width: 640px) {
            .faq-question { padding: 14px 18px; font-size: 14px; }
            .faq-answer { font-size: 13px; }
            .faq-item.active .faq-answer { padding: 0 18px 16px; }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            position: relative;
            padding: 80px 0;
            text-align: center;
        }
        .cta-section::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(15,26,58,0.85), rgba(10,16,40,0.75)); z-index: 1; }
        .cta-section .container { position: relative; z-index: 2; }
        .cta-section h2 { color: #fff; font-size: clamp(1.8rem, 3.5vw, 2.6rem); margin-bottom: 14px; }
        .cta-section p { color: rgba(255,255,255,0.75); max-width: 560px; margin: 0 auto 28px; font-size: 1.05rem; }
        .cta-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 14px; }
        .cta-actions .btn-cta {
            padding: 14px 36px; border-radius: 50px; font-weight: 700; font-size: 16px;
            display: inline-flex; align-items: center; gap: 10px;
            transition: all var(--transition);
        }
        .btn-cta-primary { background: var(--secondary); color: var(--primary-dark); }
        .btn-cta-primary:hover { background: var(--secondary-light); transform: translateY(-2px); box-shadow: var(--shadow-glow); }
        .btn-cta-secondary { background: rgba(255,255,255,0.1); color: #fff; border: 1px solid rgba(255,255,255,0.2); }
        .btn-cta-secondary:hover { background: rgba(255,255,255,0.18); transform: translateY(-2px); }

        /* ===== 页脚 ===== */
        .footer {
            background: var(--bg-dark);
            color: var(--text-white);
            padding: 56px 0 0;
            border-top: 1px solid rgba(255,255,255,0.06);
        }
        .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 { color: #fff; margin-bottom: 14px; }
        .footer-brand .site-logo .logo-sub { -webkit-text-fill-color: rgba(255,255,255,0.5); color: rgba(255,255,255,0.5); }
        .footer-brand p { color: rgba(255,255,255,0.55); font-size: 14px; max-width: 320px; line-height: 1.7; }
        .footer-social { display: flex; gap: 12px; margin-top: 18px; }
        .footer-social a { width: 40px; height: 40px; border-radius: 50%; background: rgba(255,255,255,0.06); display: flex; align-items: center; justify-content: center; color: rgba(255,255,255,0.6); transition: all var(--transition); }
        .footer-social a:hover { background: var(--secondary); color: var(--primary-dark); transform: translateY(-2px); }
        .footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 16px; font-weight: 600; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { color: rgba(255,255,255,0.5); font-size: 14px; transition: all var(--transition); }
        .footer-col ul li a:hover { color: var(--secondary); padding-left: 4px; }
        .footer-bottom { padding: 20px 0; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; font-size: 13px; color: rgba(255,255,255,0.4); }
        .footer-bottom a { color: rgba(255,255,255,0.4); }
        .footer-bottom a:hover { color: var(--secondary); }

        @media (max-width: 820px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== 通用工具 ===== */
        .text-center { text-align: center; }
        .mt-12 { margin-top: 12px; }
        .mt-24 { margin-top: 24px; }
        .mb-12 { margin-bottom: 12px; }
        .mb-24 { margin-bottom: 24px; }
        .gap-8 { gap: 8px; }
        .gap-16 { gap: 16px; }

        /* ===== 动画 ===== */
        @keyframes fadeInUp { from { opacity: 0; transform: translateY(24px); } to { opacity: 1; transform: translateY(0); } }
        .animate-in { animation: fadeInUp 0.6s ease forwards; }
        .animate-delay-1 { animation-delay: 0.1s; }
        .animate-delay-2 { animation-delay: 0.2s; }
        .animate-delay-3 { animation-delay: 0.3s; }
        .animate-delay-4 { animation-delay: 0.4s; }

        /* ===== 滚动渐入 ===== */
        .reveal { opacity: 0; transform: translateY(28px); transition: all 0.6s cubic-bezier(0.4, 0, 0.2, 1); }
        .reveal.visible { opacity: 1; transform: translateY(0); }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1e3a5f;
            --primary-light: #2a4f7a;
            --primary-dark: #0f1f33;
            --accent: #e67e22;
            --accent-hover: #d35400;
            --accent-light: #f39c12;
            --bg: #f5f7fa;
            --bg-card: #ffffff;
            --bg-dark: #0f1f33;
            --text: #1e2a3a;
            --text-light: #5a6a7a;
            --text-white: #ffffff;
            --text-muted: #8a9aaa;
            --border: #e2e8f0;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow-md: 0 8px 24px rgba(0,0,0,0.10);
            --shadow-lg: 0 16px 48px rgba(0,0,0,0.14);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --content-width: 780px;
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            overflow-x: hidden;
        }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--accent); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: inherit; border: none; outline: none; }
        button { cursor: pointer; background: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text); }
        .container {
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Header & Navigation ===== */
        .site-header {
            background: var(--primary-dark);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 16px rgba(0,0,0,0.15);
        }
        .header-top {
            background: rgba(255,255,255,0.06);
            padding: 6px 0;
            font-size: 13px;
            color: var(--text-muted);
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .header-top .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .header-top a { color: var(--text-muted); margin-left: 16px; font-size: 13px; }
        .header-top a:hover { color: var(--accent-light); }
        .header-top .domain-tag { color: var(--accent-light); font-weight: 500; }
        .header-main {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 0;
            flex-wrap: wrap;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            color: #fff;
            font-weight: 700;
            font-size: 22px;
            letter-spacing: 0.5px;
        }
        .site-logo:hover { color: #fff; opacity: 0.9; }
        .logo-icon {
            width: 42px;
            height: 42px;
            background: linear-gradient(135deg, var(--accent), var(--accent-hover));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 20px;
            color: #fff;
            box-shadow: 0 4px 12px rgba(230,126,34,0.3);
        }
        .logo-sub { display: block; font-size: 11px; font-weight: 400; opacity: 0.7; letter-spacing: 1px; }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 4px;
            flex-wrap: wrap;
        }
        .nav-list a {
            position: relative;
            display: inline-block;
            padding: 8px 18px;
            font-size: 15px;
            font-weight: 500;
            color: rgba(255,255,255,0.75);
            border-radius: var(--radius-sm);
            transition: var(--transition);
        }
        .nav-list a:hover { color: #fff; background: rgba(255,255,255,0.08); }
        .nav-list a.active {
            color: #fff;
            background: rgba(230,126,34,0.25);
        }
        .nav-list a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent);
            border-radius: 4px;
        }
        .nav-cta {
            display: inline-block;
            padding: 8px 24px;
            background: var(--accent);
            color: #fff;
            border-radius: 50px;
            font-weight: 600;
            font-size: 14px;
            transition: var(--transition);
            margin-left: 8px;
        }
        .nav-cta:hover { background: var(--accent-hover); color: #fff; transform: translateY(-1px); box-shadow: 0 4px 16px rgba(230,126,34,0.35); }
        .mobile-toggle { display: none; font-size: 24px; color: #fff; background: none; padding: 8px; border-radius: var(--radius-sm); }
        .mobile-toggle:hover { background: rgba(255,255,255,0.08); }

        /* ===== Article Banner ===== */
        .article-banner {
            position: relative;
            padding: 80px 0 60px;
            background: var(--primary-dark);
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            color: var(--text-white);
            overflow: hidden;
        }
        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,31,51,0.88) 0%, rgba(30,58,95,0.72) 100%);
            z-index: 1;
        }
        .article-banner .container { position: relative; z-index: 2; }
        .article-breadcrumb {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            color: rgba(255,255,255,0.6);
            margin-bottom: 24px;
            flex-wrap: wrap;
        }
        .article-breadcrumb a { color: rgba(255,255,255,0.7); }
        .article-breadcrumb a:hover { color: var(--accent-light); }
        .article-breadcrumb .sep { color: rgba(255,255,255,0.35); }
        .article-breadcrumb .current { color: var(--accent-light); }
        .article-category-badge {
            display: inline-block;
            padding: 4px 16px;
            background: var(--accent);
            color: #fff;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 16px;
        }
        .article-banner h1 {
            font-size: 36px;
            font-weight: 800;
            color: #fff;
            max-width: 860px;
            line-height: 1.3;
            margin-bottom: 16px;
        }
        .article-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            font-size: 14px;
            color: rgba(255,255,255,0.7);
            flex-wrap: wrap;
        }
        .article-meta i { margin-right: 6px; color: var(--accent-light); }
        .article-meta span { display: inline-flex; align-items: center; }

        /* ===== Article Content ===== */
        .article-section {
            padding: 60px 0;
        }
        .article-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 48px;
            align-items: start;
        }
        .article-main {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            padding: 40px;
        }
        .article-body {
            font-size: 16.5px;
            line-height: 1.9;
            color: var(--text);
        }
        .article-body p { margin-bottom: 1.5em; }
        .article-body h2 { font-size: 24px; margin: 2em 0 0.8em; color: var(--primary); }
        .article-body h3 { font-size: 20px; margin: 1.8em 0 0.6em; color: var(--primary-light); }
        .article-body ul, .article-body ol { margin: 1em 0 1.5em; padding-left: 1.6em; }
        .article-body li { margin-bottom: 0.5em; list-style: disc; }
        .article-body ol li { list-style: decimal; }
        .article-body img { margin: 1.5em auto; border-radius: var(--radius-sm); box-shadow: var(--shadow-sm); }
        .article-body blockquote {
            margin: 1.5em 0;
            padding: 16px 24px;
            border-left: 4px solid var(--accent);
            background: rgba(230,126,34,0.06);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light);
            font-style: italic;
        }
        .article-body a { color: var(--accent); font-weight: 500; text-decoration: underline; }
        .article-body a:hover { color: var(--accent-hover); }

        /* ===== Article Tags & Share ===== */
        .article-footer-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 32px;
            margin-top: 32px;
            border-top: 1px solid var(--border);
            flex-wrap: wrap;
            gap: 16px;
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .article-tags a {
            display: inline-block;
            padding: 4px 14px;
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: 50px;
            font-size: 13px;
            color: var(--text-light);
            transition: var(--transition);
        }
        .article-tags a:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
        .share-links {
            display: flex;
            gap: 10px;
            align-items: center;
        }
        .share-links span { font-size: 14px; color: var(--text-light); margin-right: 4px; }
        .share-links a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--bg);
            color: var(--text-light);
            border: 1px solid var(--border);
            transition: var(--transition);
            font-size: 15px;
        }
        .share-links a:hover { background: var(--accent); color: #fff; border-color: var(--accent); transform: translateY(-2px); }

        /* ===== Article Navigation ===== */
        .article-nav {
            display: flex;
            justify-content: space-between;
            gap: 16px;
            margin-top: 40px;
            padding-top: 32px;
            border-top: 1px solid var(--border);
            flex-wrap: wrap;
        }
        .article-nav a {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 10px 20px;
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 14px;
            font-weight: 500;
            color: var(--text);
            transition: var(--transition);
        }
        .article-nav a:hover { background: var(--primary); color: #fff; border-color: var(--primary); transform: translateY(-1px); box-shadow: var(--shadow-sm); }
        .article-nav .back-list { color: var(--accent); border-color: rgba(230,126,34,0.3); }
        .article-nav .back-list:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

        /* ===== Related Articles ===== */
        .related-section {
            padding: 60px 0;
            background: var(--bg);
        }
        .related-section .section-title {
            font-size: 28px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 32px;
            text-align: center;
        }
        .related-section .section-title span { color: var(--accent); }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .related-card .card-img {
            height: 180px;
            background-size: cover;
            background-position: center;
            position: relative;
        }
        .related-card .card-img .cat-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            padding: 3px 12px;
            background: var(--accent);
            color: #fff;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
        }
        .related-card .card-body { padding: 20px; }
        .related-card .card-body h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; line-height: 1.4; }
        .related-card .card-body h3 a { color: var(--text); }
        .related-card .card-body h3 a:hover { color: var(--accent); }
        .related-card .card-body p { font-size: 14px; color: var(--text-light); margin-bottom: 12px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .related-card .card-body .meta { font-size: 12px; color: var(--text-muted); display: flex; align-items: center; gap: 12px; }

        /* ===== CTA Section ===== */
        .cta-section {
            padding: 80px 0;
            background: var(--primary-dark);
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,31,51,0.92) 0%, rgba(30,58,95,0.80) 100%);
        }
        .cta-section .container { position: relative; z-index: 2; text-align: center; }
        .cta-section h2 { font-size: 32px; font-weight: 700; color: #fff; margin-bottom: 16px; }
        .cta-section p { font-size: 18px; color: rgba(255,255,255,0.75); max-width: 600px; margin: 0 auto 32px; }
        .cta-section .btn-group { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }
        .btn-primary, .btn-outline {
            display: inline-block;
            padding: 14px 36px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 600;
            transition: var(--transition);
        }
        .btn-primary { background: var(--accent); color: #fff; }
        .btn-primary:hover { background: var(--accent-hover); color: #fff; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(230,126,34,0.35); }
        .btn-outline { border: 2px solid rgba(255,255,255,0.3); color: #fff; background: transparent; }
        .btn-outline:hover { border-color: var(--accent); background: var(--accent); color: #fff; transform: translateY(-2px); }

        /* ===== Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 24px;
        }
        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            padding: 24px;
        }
        .sidebar-card h3 {
            font-size: 16px;
            font-weight: 600;
            color: var(--primary);
            margin-bottom: 16px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--accent);
        }
        .sidebar-card ul { display: flex; flex-direction: column; gap: 10px; }
        .sidebar-card ul li { font-size: 14px; }
        .sidebar-card ul li a { color: var(--text-light); display: flex; align-items: center; gap: 8px; }
        .sidebar-card ul li a:hover { color: var(--accent); padding-left: 4px; }
        .sidebar-card ul li a i { color: var(--accent); font-size: 12px; width: 16px; }
        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            text-align: center;
            padding: 32px 20px;
        }
        .sidebar-cta h4 { color: #fff; font-size: 18px; margin-bottom: 8px; }
        .sidebar-cta p { color: rgba(255,255,255,0.7); font-size: 14px; margin-bottom: 16px; }
        .sidebar-cta .btn-primary { font-size: 14px; padding: 10px 28px; }

        /* ===== Not Found ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
        }
        .not-found-box i { font-size: 56px; color: var(--text-muted); margin-bottom: 20px; display: block; }
        .not-found-box h2 { font-size: 28px; color: var(--text); margin-bottom: 12px; }
        .not-found-box p { color: var(--text-light); margin-bottom: 24px; font-size: 16px; }
        .not-found-box .btn-primary { display: inline-block; }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.7);
            padding: 60px 0 0;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand p { font-size: 14px; line-height: 1.8; margin-top: 16px; color: rgba(255,255,255,0.6); max-width: 320px; }
        .footer-social { display: flex; gap: 12px; margin-top: 20px; }
        .footer-social a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255,255,255,0.08);
            color: rgba(255,255,255,0.7);
            transition: var(--transition);
            font-size: 18px;
        }
        .footer-social a:hover { background: var(--accent); color: #fff; transform: translateY(-2px); }
        .footer-col h4 { color: #fff; font-size: 16px; font-weight: 600; margin-bottom: 20px; position: relative; padding-bottom: 10px; }
        .footer-col h4::after { content: ''; position: absolute; bottom: 0; left: 0; width: 32px; height: 2px; background: var(--accent); border-radius: 2px; }
        .footer-col ul { display: flex; flex-direction: column; gap: 10px; }
        .footer-col ul li a { color: rgba(255,255,255,0.6); font-size: 14px; transition: var(--transition); }
        .footer-col ul li a:hover { color: var(--accent-light); padding-left: 4px; }
        .footer-bottom {
            padding: 24px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: rgba(255,255,255,0.45);
        }
        .footer-bottom a { color: rgba(255,255,255,0.55); }
        .footer-bottom a:hover { color: var(--accent-light); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .article-layout { grid-template-columns: 1fr; }
            .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
            .related-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .header-top .container { flex-direction: column; gap: 4px; text-align: center; }
            .mobile-toggle { display: block; }
            .nav-list { display: none; width: 100%; flex-direction: column; padding: 16px 0 8px; gap: 2px; }
            .nav-list.open { display: flex; }
            .nav-list a { width: 100%; text-align: center; padding: 10px; }
            .nav-list a.active::after { display: none; }
            .nav-cta { margin-left: 0; margin-top: 4px; text-align: center; }
            .article-banner h1 { font-size: 26px; }
            .article-banner { padding: 48px 0 36px; }
            .article-main { padding: 24px; }
            .article-section { padding: 36px 0; }
            .article-body { font-size: 15px; }
            .article-footer-meta { flex-direction: column; align-items: flex-start; }
            .article-sidebar { grid-template-columns: 1fr; }
            .related-grid { grid-template-columns: 1fr; }
            .cta-section h2 { font-size: 24px; }
            .cta-section p { font-size: 16px; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .article-nav { flex-direction: column; align-items: stretch; }
            .article-nav a { justify-content: center; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .article-banner h1 { font-size: 22px; }
            .article-main { padding: 16px; }
            .article-body { font-size: 14.5px; }
            .related-card .card-img { height: 140px; }
            .cta-section { padding: 48px 0; }
            .cta-section .btn-group { flex-direction: column; align-items: center; }
            .btn-primary, .btn-outline { width: 100%; max-width: 280px; text-align: center; }
            .article-meta { gap: 12px; font-size: 13px; }
        }

        /* ===== Helper ===== */
        .text-center { text-align: center; }
        .mt-16 { margin-top: 16px; }
        .mb-16 { margin-bottom: 16px; }
        .gap-8 { gap: 8px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a5cff;
            --primary-dark: #0d47c4;
            --primary-light: #e8f0ff;
            --primary-gradient: linear-gradient(135deg, #1a5cff 0%, #0d47c4 100%);
            --secondary: #ff6b35;
            --secondary-light: #fff0e8;
            --accent: #00c9a7;
            --bg: #f8fafc;
            --bg-white: #ffffff;
            --bg-dark: #0f1724;
            --bg-card: #ffffff;
            --text: #1e293b;
            --text-dark: #0f1724;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 8px;
            --radius: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
            --shadow-hover: 0 12px 48px rgba(0, 0, 0, 0.15);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --max-width: 1200px;
            --header-h: 72px;
            --topbar-h: 36px;
            --nav-h: 72px;
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            transition: var(--transition);
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            color: var(--text-dark);
            font-weight: 700;
        }
        h1 {
            font-size: clamp(2.2rem, 5vw, 3.6rem);
        }
        h2 {
            font-size: clamp(1.6rem, 3.5vw, 2.4rem);
        }
        h3 {
            font-size: clamp(1.2rem, 2.5vw, 1.6rem);
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            margin-bottom: 1rem;
            color: var(--text-light);
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Top Bar ===== */
        .topbar {
            background: var(--bg-dark);
            height: var(--topbar-h);
            display: flex;
            align-items: center;
            font-size: 0.8rem;
            color: var(--text-white);
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .topbar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }
        .topbar-left span {
            opacity: 0.7;
            margin-right: 16px;
        }
        .topbar-left i {
            margin-right: 4px;
            color: var(--accent);
        }
        .topbar-right a {
            color: var(--text-white);
            opacity: 0.7;
            margin-left: 16px;
            font-size: 0.8rem;
            transition: var(--transition);
        }
        .topbar-right a:hover {
            opacity: 1;
            color: var(--primary-light);
        }
        .topbar-right .btn-topbar {
            background: var(--secondary);
            color: #fff;
            padding: 2px 14px;
            border-radius: 20px;
            opacity: 1;
            font-weight: 600;
        }
        .topbar-right .btn-topbar:hover {
            background: #e55a2b;
            color: #fff;
            opacity: 1;
        }

        /* ===== Header / Nav ===== */
        .header {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: var(--shadow-sm);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--nav-h);
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.3rem;
            color: var(--text-dark);
        }
        .site-logo:hover {
            color: var(--primary);
        }
        .logo-icon {
            width: 40px;
            height: 40px;
            background: var(--primary-gradient);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-size: 1.2rem;
        }
        .logo-sub {
            display: block;
            font-size: 0.65rem;
            font-weight: 400;
            color: var(--text-light);
            letter-spacing: 0.3px;
        }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .nav-list a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            color: var(--text);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
            position: relative;
        }
        .nav-list a:hover {
            background: var(--primary-light);
            color: var(--primary);
        }
        .nav-list a.active {
            background: var(--primary-gradient);
            color: #fff;
            box-shadow: 0 4px 14px rgba(26, 92, 255, 0.35);
        }
        .nav-list a.active:hover {
            background: var(--primary-gradient);
            color: #fff;
        }
        .nav-cta {
            background: var(--secondary) !important;
            color: #fff !important;
            padding: 8px 22px !important;
            border-radius: var(--radius-sm) !important;
            font-weight: 600 !important;
        }
        .nav-cta:hover {
            background: #e55a2b !important;
            color: #fff !important;
            box-shadow: 0 4px 14px rgba(255, 107, 53, 0.4) !important;
        }
        .nav-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--text-dark);
            background: none;
            padding: 4px 8px;
            border-radius: var(--radius-sm);
            cursor: pointer;
        }
        .nav-toggle:hover {
            background: var(--primary-light);
        }

        /* ===== Hero / Banner ===== */
        .page-hero {
            position: relative;
            padding: 100px 0 80px;
            background: var(--bg-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center center;
            background-blend-mode: overlay;
            text-align: center;
            overflow: hidden;
        }
        .page-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 23, 36, 0.88) 0%, rgba(15, 23, 36, 0.72) 100%);
            z-index: 1;
        }
        .page-hero .container {
            position: relative;
            z-index: 2;
        }
        .page-hero h1 {
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .page-hero h1 i {
            color: var(--secondary);
            margin-right: 12px;
        }
        .page-hero p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.15rem;
            max-width: 680px;
            margin: 0 auto 28px;
            line-height: 1.8;
        }
        .page-hero .hero-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
        }
        .page-hero .hero-tags span {
            background: rgba(255, 255, 255, 0.12);
            backdrop-filter: blur(4px);
            color: #fff;
            padding: 6px 18px;
            border-radius: 20px;
            font-size: 0.85rem;
            border: 1px solid rgba(255, 255, 255, 0.15);
        }
        .breadcrumb {
            display: flex;
            justify-content: center;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 20px;
        }
        .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }
        .breadcrumb a:hover {
            color: #fff;
        }
        .breadcrumb .sep {
            opacity: 0.4;
        }

        /* ===== Section Base ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-white);
        }
        .section-dark {
            background: var(--bg-dark);
        }
        .section-light {
            background: var(--primary-light);
        }
        .section-header {
            text-align: center;
            margin-bottom: 52px;
        }
        .section-header h2 {
            margin-bottom: 12px;
        }
        .section-header p {
            max-width: 600px;
            margin: 0 auto;
            font-size: 1.05rem;
        }
        .section-header .badge {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 4px 16px;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            margin-bottom: 12px;
        }

        /* ===== Card Grid ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 28px;
        }
        .card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid var(--border);
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-hover);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16 / 10;
            object-fit: cover;
            display: block;
            border-radius: var(--radius) var(--radius) 0 0;
        }
        .card-body {
            padding: 24px 22px 26px;
        }
        .card-body h3 {
            margin-bottom: 8px;
            font-size: 1.15rem;
        }
        .card-body h3 a {
            color: var(--text-dark);
        }
        .card-body h3 a:hover {
            color: var(--primary);
        }
        .card-body p {
            font-size: 0.92rem;
            margin-bottom: 14px;
            color: var(--text-light);
        }
        .card .tag {
            display: inline-block;
            background: var(--primary-light);
            color: var(--primary);
            padding: 2px 12px;
            border-radius: 12px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-right: 6px;
            margin-bottom: 6px;
        }
        .card .tag-alt {
            background: var(--secondary-light);
            color: var(--secondary);
        }
        .card .tag-green {
            background: #e0f7f1;
            color: #0d9e7a;
        }

        /* ===== Featured / List ===== */
        .list-card {
            display: flex;
            gap: 24px;
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 20px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
            align-items: center;
        }
        .list-card:hover {
            box-shadow: var(--shadow);
            transform: translateX(4px);
        }
        .list-card .rank {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--primary);
            min-width: 48px;
            text-align: center;
            opacity: 0.6;
        }
        .list-card .rank.gold {
            color: #f59e0b;
            opacity: 1;
        }
        .list-card .rank.silver {
            color: #94a3b8;
            opacity: 1;
        }
        .list-card .rank.bronze {
            color: #cd7f4b;
            opacity: 1;
        }
        .list-card .info {
            flex: 1;
        }
        .list-card .info h4 {
            font-size: 1.05rem;
            margin-bottom: 4px;
        }
        .list-card .info p {
            font-size: 0.85rem;
            color: var(--text-light);
            margin-bottom: 0;
        }
        .list-card .meta {
            font-size: 0.8rem;
            color: var(--text-light);
            display: flex;
            gap: 16px;
            align-items: center;
        }
        .list-card .meta i {
            margin-right: 4px;
            color: var(--primary);
        }
        .list-card .btn-sm {
            padding: 6px 18px;
            border-radius: 20px;
            background: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
            font-size: 0.8rem;
            white-space: nowrap;
        }
        .list-card .btn-sm:hover {
            background: var(--primary);
            color: #fff;
        }
        .list-stack {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        /* ===== Steps / Flow ===== */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px;
            counter-reset: step;
        }
        .step-card {
            text-align: center;
            padding: 36px 20px 32px;
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            position: relative;
        }
        .step-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow);
        }
        .step-card .step-num {
            width: 56px;
            height: 56px;
            background: var(--primary-gradient);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            font-weight: 700;
            margin: 0 auto 18px;
            box-shadow: 0 6px 20px rgba(26, 92, 255, 0.3);
        }
        .step-card h4 {
            margin-bottom: 8px;
        }
        .step-card p {
            font-size: 0.9rem;
            color: var(--text-light);
            margin-bottom: 0;
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--primary-light);
        }
        .faq-q {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-dark);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            background: none;
            width: 100%;
            text-align: left;
        }
        .faq-q i {
            color: var(--primary);
            font-size: 1.1rem;
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-q.open i {
            transform: rotate(180deg);
        }
        .faq-a {
            padding: 0 24px 0;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            color: var(--text-light);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-a.open {
            padding: 0 24px 20px;
            max-height: 400px;
        }

        /* ===== CTA ===== */
        .cta-box {
            background: var(--primary-gradient);
            border-radius: var(--radius-lg);
            padding: 60px 48px;
            text-align: center;
            color: #fff;
            box-shadow: 0 12px 48px rgba(26, 92, 255, 0.35);
            position: relative;
            overflow: hidden;
        }
        .cta-box::after {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: rgba(255, 255, 255, 0.04);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-box h2 {
            color: #fff;
            margin-bottom: 16px;
        }
        .cta-box p {
            color: rgba(255, 255, 255, 0.85);
            max-width: 560px;
            margin: 0 auto 28px;
            font-size: 1.05rem;
        }
        .cta-box .btn-cta {
            display: inline-block;
            background: #fff;
            color: var(--primary);
            padding: 14px 40px;
            border-radius: 40px;
            font-weight: 700;
            font-size: 1.05rem;
            transition: var(--transition);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }
        .cta-box .btn-cta:hover {
            transform: translateY(-2px) scale(1.02);
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
            color: var(--primary-dark);
        }
        .cta-box .btn-cta i {
            margin-right: 8px;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark);
            color: var(--text-white);
            padding: 60px 0 0;
        }
        .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 {
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-brand .site-logo .logo-sub {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-brand p {
            color: rgba(255, 255, 255, 0.6);
            font-size: 0.9rem;
            line-height: 1.8;
            margin-bottom: 20px;
            max-width: 360px;
        }
        .footer-social {
            display: flex;
            gap: 12px;
        }
        .footer-social a {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: rgba(255, 255, 255, 0.08);
            display: flex;
            align-items: center;
            justify-content: center;
            color: rgba(255, 255, 255, 0.6);
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .footer-social a:hover {
            background: var(--primary);
            color: #fff;
            transform: translateY(-3px);
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 18px;
            font-weight: 600;
        }
        .footer-col ul li {
            margin-bottom: 10px;
        }
        .footer-col ul li a {
            color: rgba(255, 255, 255, 0.55);
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .footer-col ul li a:hover {
            color: #fff;
            padding-left: 4px;
        }
        .footer-bottom {
            padding: 24px 0;
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: #fff;
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .card-grid {
                grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
            }
        }

        @media (max-width: 768px) {
            :root {
                --nav-h: 64px;
                --topbar-h: 32px;
            }
            .topbar-left span {
                display: none;
            }
            .topbar-right a {
                margin-left: 12px;
                font-size: 0.75rem;
            }
            .nav-toggle {
                display: block;
            }
            .nav-list {
                position: fixed;
                top: calc(var(--nav-h) + var(--topbar-h));
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 16px 24px 24px;
                box-shadow: var(--shadow-lg);
                border-top: 1px solid var(--border);
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                border-radius: 0 0 var(--radius) var(--radius);
                gap: 4px;
            }
            .nav-list.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-list a {
                width: 100%;
                padding: 12px 16px;
                border-radius: var(--radius-sm);
            }
            .nav-list a.active {
                background: var(--primary-gradient);
                color: #fff;
            }
            .nav-cta {
                text-align: center;
                margin-top: 4px;
            }
            .page-hero {
                padding: 60px 0 50px;
            }
            .page-hero p {
                font-size: 1rem;
            }
            .section {
                padding: 50px 0;
            }
            .section-header {
                margin-bottom: 36px;
            }
            .card-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .list-card {
                flex-direction: column;
                text-align: center;
                padding: 16px;
            }
            .list-card .rank {
                min-width: auto;
            }
            .list-card .meta {
                justify-content: center;
                flex-wrap: wrap;
            }
            .steps-grid {
                grid-template-columns: 1fr 1fr;
                gap: 16px;
            }
            .cta-box {
                padding: 40px 24px;
            }
            .cta-box .btn-cta {
                padding: 12px 28px;
                font-size: 0.95rem;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .card-grid {
                grid-template-columns: 1fr;
            }
            .steps-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .page-hero h1 {
                font-size: 1.8rem;
            }
            .page-hero .hero-tags span {
                font-size: 0.75rem;
                padding: 4px 12px;
            }
            .breadcrumb {
                font-size: 0.75rem;
                flex-wrap: wrap;
            }
            .list-card {
                padding: 14px;
            }
            .list-card .info h4 {
                font-size: 0.95rem;
            }
            .faq-q {
                padding: 14px 16px;
                font-size: 0.92rem;
            }
            .faq-a.open {
                padding: 0 16px 16px;
            }
            .cta-box h2 {
                font-size: 1.4rem;
            }
            .cta-box p {
                font-size: 0.9rem;
            }
        }

        /* ===== Utilities ===== */
        .text-center {
            text-align: center;
        }
        .mt-20 {
            margin-top: 20px;
        }
        .mb-20 {
            margin-bottom: 20px;
        }
        .gap-8 {
            gap: 8px;
        }
        .flex-center {
            display: flex;
            justify-content: center;
            align-items: center;
        }
        .btn-primary {
            display: inline-block;
            background: var(--primary-gradient);
            color: #fff;
            padding: 12px 32px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 1rem;
            box-shadow: 0 4px 16px rgba(26, 92, 255, 0.3);
            transition: var(--transition);
            border: none;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(26, 92, 255, 0.4);
            color: #fff;
        }
        .btn-outline {
            display: inline-block;
            border: 2px solid var(--primary);
            color: var(--primary);
            padding: 10px 28px;
            border-radius: 40px;
            font-weight: 600;
            font-size: 0.95rem;
            background: transparent;
            transition: var(--transition);
        }
        .btn-outline:hover {
            background: var(--primary);
            color: #fff;
        }
        .section-divider {
            width: 60px;
            height: 4px;
            background: var(--primary-gradient);
            border-radius: 4px;
            margin: 12px auto 0;
        }