/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a3a5c;
            --primary-light: #2a5a8c;
            --primary-dark: #0f2440;
            --accent: #e8a838;
            --accent-light: #f0c060;
            --accent-dark: #c88a20;
            --bg-body: #f5f7fa;
            --bg-white: #ffffff;
            --bg-card: #ffffff;
            --bg-dark: #0f2440;
            --text-primary: #1a2a3a;
            --text-secondary: #4a5a6a;
            --text-muted: #8a9aaa;
            --text-light: #f0f4f8;
            --border: #e2e8f0;
            --border-light: #f0f2f5;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow: 0 4px 20px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
            --shadow-hover: 0 8px 30px rgba(0,0,0,0.15);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
            --container: 1200px;
            --nav-height: 72px;
            --topbar-height: 40px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a { color: inherit; text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-light); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; font-size: inherit; border: none; outline: none; }
        button { cursor: pointer; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
        .container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
        .container-narrow { max-width: 960px; }
        .section { padding: 80px 0; }
        .section-title { font-size: 2rem; margin-bottom: 12px; text-align: center; }
        .section-subtitle { font-size: 1.1rem; color: var(--text-secondary); text-align: center; max-width: 640px; margin: 0 auto 48px; }

        /* ===== Top Bar ===== */
        .topbar {
            height: var(--topbar-height);
            background: var(--primary-dark);
            color: var(--text-light);
            font-size: 0.85rem;
            display: flex;
            align-items: center;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .topbar .container { display: flex; justify-content: space-between; align-items: center; }
        .topbar-left { display: flex; gap: 20px; }
        .topbar-left span { opacity: 0.8; }
        .topbar-left i { margin-right: 6px; color: var(--accent); }
        .topbar-right { display: flex; gap: 16px; align-items: center; }
        .topbar-right a { color: var(--text-light); opacity: 0.85; transition: var(--transition); }
        .topbar-right a:hover { opacity: 1; color: var(--accent); }

        /* ===== Header & Nav ===== */
        header {
            position: sticky; top: 0; z-index: 100;
            background: var(--bg-white);
            box-shadow: 0 2px 12px rgba(0,0,0,0.06);
            height: var(--nav-height);
        }
        header .container { display: flex; align-items: center; justify-content: space-between; height: 100%; }
        .logo { font-size: 1.6rem; font-weight: 800; color: var(--primary); letter-spacing: -0.5px; }
        .logo span { color: var(--accent); }
        .logo-sub { font-size: 0.75rem; color: var(--text-muted); font-weight: 400; letter-spacing: 1px; margin-left: 8px; }
        .nav-main { display: flex; align-items: center; gap: 8px; }
        .nav-main a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: var(--transition);
            position: relative;
        }
        .nav-main a:hover { color: var(--primary); background: rgba(26,58,92,0.06); }
        .nav-main a.active { color: var(--primary); background: rgba(26,58,92,0.08); font-weight: 600; }
        .nav-main a.active::after {
            content: ''; position: absolute; bottom: 2px; left: 50%; transform: translateX(-50%);
            width: 20px; height: 3px; background: var(--accent); border-radius: 2px;
        }
        .nav-cta {
            background: var(--primary) !important;
            color: #fff !important;
            padding: 8px 24px !important;
            border-radius: var(--radius-sm) !important;
            font-weight: 600 !important;
        }
        .nav-cta:hover { background: var(--primary-light) !important; transform: translateY(-1px); box-shadow: 0 4px 12px rgba(26,58,92,0.25) !important; }
        .nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; cursor: pointer; background: none; border: none; }
        .nav-toggle span { width: 26px; height: 2.5px; background: var(--text-primary); border-radius: 2px; transition: var(--transition); }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 520px;
            display: flex;
            align-items: center;
            background: var(--primary-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            overflow: hidden;
        }
        .hero::before {
            content: '';
            position: absolute; inset: 0;
            background: linear-gradient(135deg, rgba(15,36,64,0.85) 0%, rgba(26,58,92,0.7) 100%);
        }
        .hero .container { position: relative; z-index: 2; padding: 80px 24px; }
        .hero-content { max-width: 680px; }
        .hero-badge {
            display: inline-flex; align-items: center; gap: 8px;
            background: rgba(232,168,56,0.2); color: var(--accent-light);
            padding: 6px 18px; border-radius: 50px; font-size: 0.85rem;
            margin-bottom: 20px; border: 1px solid rgba(232,168,56,0.3);
        }
        .hero-badge i { font-size: 0.75rem; }
        .hero h1 { font-size: 3.2rem; color: #fff; line-height: 1.2; margin-bottom: 20px; font-weight: 800; }
        .hero h1 span { color: var(--accent); }
        .hero p { font-size: 1.2rem; color: rgba(255,255,255,0.8); margin-bottom: 32px; max-width: 560px; }
        .hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }
        .btn {
            display: inline-flex; align-items: center; gap: 8px;
            padding: 14px 32px; border-radius: var(--radius-sm);
            font-weight: 600; font-size: 1rem;
            transition: var(--transition); border: none;
        }
        .btn-primary { background: var(--accent); color: var(--primary-dark); }
        .btn-primary:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,168,56,0.35); color: var(--primary-dark); }
        .btn-outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.3); }
        .btn-outline:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
        .btn-lg { padding: 16px 40px; font-size: 1.1rem; }

        /* ===== Stats ===== */
        .stats-bar {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border);
            padding: 28px 0;
        }
        .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; text-align: center; }
        .stat-item h3 { font-size: 2rem; color: var(--primary); margin-bottom: 4px; }
        .stat-item p { color: var(--text-muted); font-size: 0.9rem; }

        /* ===== Features / 核心服务 ===== */
        .features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 36px 28px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            text-align: center;
        }
        .feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); border-color: var(--accent); }
        .feature-icon {
            width: 64px; height: 64px; margin: 0 auto 20px;
            background: rgba(26,58,92,0.06); border-radius: 16px;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.8rem; color: var(--primary); transition: var(--transition);
        }
        .feature-card:hover .feature-icon { background: var(--primary); color: #fff; }
        .feature-card h3 { font-size: 1.2rem; margin-bottom: 12px; }
        .feature-card p { color: var(--text-secondary); font-size: 0.95rem; }

        /* ===== Category / 分类入口 ===== */
        .category-section { background: var(--bg-white); }
        .category-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .category-card {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            background: var(--bg-card);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            min-height: 220px;
            display: flex; flex-direction: column;
        }
        .category-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
        .category-card .card-img {
            height: 140px;
            background-size: cover; background-position: center;
            position: relative;
        }
        .category-card .card-img .overlay {
            position: absolute; inset: 0;
            background: linear-gradient(0deg, rgba(15,36,64,0.5) 0%, transparent 60%);
        }
        .category-card .card-body { padding: 20px 24px 24px; flex: 1; display: flex; flex-direction: column; }
        .category-card .card-body h3 { font-size: 1.15rem; margin-bottom: 6px; }
        .category-card .card-body p { color: var(--text-secondary); font-size: 0.9rem; flex: 1; }
        .category-card .card-body .tag {
            align-self: flex-start;
            background: rgba(232,168,56,0.12);
            color: var(--accent-dark);
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 500;
            margin-top: 12px;
        }

        /* ===== Latest Posts / 最新资讯 ===== */
        .posts-section { background: var(--bg-body); }
        .posts-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
        .post-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            display: flex; flex-direction: column;
        }
        .post-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
        .post-card .post-img {
            height: 200px;
            background-size: cover; background-position: center;
        }
        .post-card .post-body { padding: 24px; flex: 1; display: flex; flex-direction: column; }
        .post-card .post-meta { display: flex; gap: 16px; font-size: 0.85rem; color: var(--text-muted); margin-bottom: 12px; }
        .post-card .post-meta span { display: flex; align-items: center; gap: 4px; }
        .post-card .post-body h3 { font-size: 1.15rem; margin-bottom: 10px; line-height: 1.4; }
        .post-card .post-body h3 a { color: var(--text-primary); }
        .post-card .post-body h3 a:hover { color: var(--primary-light); }
        .post-card .post-body p { color: var(--text-secondary); font-size: 0.9rem; flex: 1; }
        .post-card .post-body .post-tag {
            align-self: flex-start;
            background: rgba(26,58,92,0.08);
            color: var(--primary);
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 500;
            margin-top: 16px;
        }
        .posts-empty {
            grid-column: 1 / -1;
            text-align: center;
            padding: 60px 20px;
            color: var(--text-muted);
            background: var(--bg-white);
            border-radius: var(--radius);
            border: 1px dashed var(--border);
        }
        .posts-empty i { font-size: 3rem; margin-bottom: 16px; opacity: 0.4; }

        /* ===== How It Works / 使用流程 ===== */
        .steps-section { background: var(--bg-white); }
        .steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; counter-reset: step; }
        .step-item { text-align: center; position: relative; }
        .step-item::after {
            content: ''; position: absolute; top: 36px; left: 60%; width: 80%; height: 2px;
            background: linear-gradient(90deg, var(--border), transparent); 
        }
        .steps-grid > .step-item:last-child::after { display: none; }
        .step-number {
            width: 72px; height: 72px; margin: 0 auto 20px;
            background: var(--primary); color: #fff;
            border-radius: 50%;
            display: flex; align-items: center; justify-content: center;
            font-size: 1.8rem; font-weight: 700;
            box-shadow: 0 8px 24px rgba(26,58,92,0.2);
        }
        .step-item h3 { font-size: 1.1rem; margin-bottom: 8px; }
        .step-item p { color: var(--text-secondary); font-size: 0.9rem; }

        /* ===== FAQ ===== */
        .faq-section { background: var(--bg-body); }
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover { border-color: var(--border); }
        .faq-question {
            padding: 20px 24px;
            font-weight: 600;
            font-size: 1.05rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            transition: var(--transition);
            background: none;
            width: 100%;
            text-align: left;
            color: var(--text-primary);
        }
        .faq-question i { transition: var(--transition); color: var(--text-muted); font-size: 0.9rem; }
        .faq-item.active .faq-question i { transform: rotate(180deg); color: var(--primary); }
        .faq-answer {
            max-height: 0; overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary-dark);
            background-image: url('/assets/images/backpic/back-2.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(15,36,64,0.88) 0%, rgba(26,58,92,0.78) 100%);
        }
        .cta-section .container { position: relative; z-index: 2; text-align: center; padding: 80px 24px; }
        .cta-section h2 { font-size: 2.2rem; color: #fff; margin-bottom: 16px; }
        .cta-section p { color: rgba(255,255,255,0.8); max-width: 560px; margin: 0 auto 32px; font-size: 1.1rem; }

        /* ===== Footer ===== */
        footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.7);
            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(255,255,255,0.08); }
        .footer-brand .logo { color: #fff; margin-bottom: 12px; display: inline-block; }
        .footer-brand p { font-size: 0.9rem; max-width: 320px; line-height: 1.8; }
        .footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
        .footer-col a { display: block; padding: 4px 0; font-size: 0.9rem; color: rgba(255,255,255,0.6); transition: var(--transition); }
        .footer-col a:hover { color: var(--accent); padding-left: 4px; }
        .footer-bottom { padding: 20px 0; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; 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(--accent); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .category-grid { grid-template-columns: repeat(2, 1fr); }
            .steps-grid { grid-template-columns: repeat(2, 1fr); gap: 28px; }
            .steps-grid .step-item::after { display: none; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
            .hero h1 { font-size: 2.6rem; }
        }
        @media (max-width: 768px) {
            .topbar-left span:nth-child(2) { display: none; }
            .nav-main { display: none; }
            .nav-main.open { display: flex; flex-direction: column; position: absolute; top: var(--nav-height); left: 0; right: 0; background: var(--bg-white); padding: 16px 24px; box-shadow: var(--shadow-lg); border-top: 1px solid var(--border); }
            .nav-toggle { display: flex; }
            .hero { min-height: 400px; }
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 1rem; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .section { padding: 56px 0; }
            .section-title { font-size: 1.6rem; }
            .features-grid { grid-template-columns: 1fr; }
            .category-grid { grid-template-columns: 1fr; }
            .posts-grid { grid-template-columns: 1fr; }
            .steps-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .hero-actions .btn { width: 100%; justify-content: center; }
            .cta-section h2 { font-size: 1.6rem; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .hero h1 { font-size: 1.6rem; }
            .hero .container { padding: 48px 16px; }
            .stat-item h3 { font-size: 1.4rem; }
            .topbar { font-size: 0.75rem; }
            .topbar-left { gap: 12px; }
            .topbar-left span:first-child { display: none; }
        }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-12 { margin-top: 12px; }
        .mb-12 { margin-bottom: 12px; }
        .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); white-space: nowrap; border: 0; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a3a5c;
            --primary-light: #2a5a8a;
            --primary-dark: #0f2a44;
            --secondary: #e8a838;
            --secondary-light: #f0c060;
            --secondary-dark: #c88a20;
            --accent: #d94a4a;
            --bg-white: #ffffff;
            --bg-light: #f5f7fa;
            --bg-dark: #0f1a2a;
            --bg-mid: #eef1f6;
            --text-primary: #1a2a3a;
            --text-secondary: #4a5a6a;
            --text-light: #7a8a9a;
            --text-white: #ffffff;
            --border: #dce0e8;
            --border-light: #e8ecf2;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 6px 24px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --max-width: 1200px;
            --header-h: 72px;
        }

        /* ===== 基础 Reset ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-light);
            -webkit-font-smoothing: antialiased;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover,
        a:focus {
            color: var(--primary);
        }
        button,
        input,
        select,
        textarea {
            font-family: inherit;
            font-size: inherit;
            line-height: inherit;
        }
        button {
            cursor: pointer;
            border: none;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }

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

        /* ===== 通用标题 ===== */
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            line-height: 1.3;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .section-desc {
            font-size: 1.05rem;
            color: var(--text-secondary);
            max-width: 680px;
            line-height: 1.7;
        }
        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-header .section-desc {
            margin: 0 auto;
        }
        @media (max-width: 768px) {
            .section-title {
                font-size: 1.5rem;
            }
            .section-desc {
                font-size: 0.95rem;
            }
            .section-header {
                margin-bottom: 32px;
            }
        }

        /* ===== 按钮 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: var(--radius-sm);
            transition: var(--transition);
            border: 2px solid transparent;
            text-align: center;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--secondary);
            color: var(--text-primary);
            border-color: var(--secondary);
        }
        .btn-primary:hover,
        .btn-primary:focus {
            background: var(--secondary-light);
            border-color: var(--secondary-light);
            color: var(--text-primary);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(232, 168, 56, 0.35);
        }
        .btn-outline {
            background: transparent;
            color: var(--text-white);
            border-color: var(--text-white);
        }
        .btn-outline:hover,
        .btn-outline:focus {
            background: var(--text-white);
            color: var(--primary);
            transform: translateY(-2px);
        }
        .btn-lg {
            padding: 16px 40px;
            font-size: 1.1rem;
            border-radius: var(--radius-md);
        }
        .btn-sm {
            padding: 8px 18px;
            font-size: 0.85rem;
            border-radius: 6px;
        }
        .btn i {
            font-size: 0.9em;
        }
        @media (max-width: 520px) {
            .btn-lg {
                padding: 14px 28px;
                font-size: 1rem;
            }
        }

        /* ===== 徽章 ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 4px 14px;
            font-size: 0.8rem;
            font-weight: 600;
            border-radius: 20px;
            background: var(--bg-mid);
            color: var(--text-secondary);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .badge-primary {
            background: rgba(26, 58, 92, 0.08);
            color: var(--primary);
            border-color: rgba(26, 58, 92, 0.15);
        }
        .badge-secondary {
            background: rgba(232, 168, 56, 0.12);
            color: var(--secondary-dark);
            border-color: rgba(232, 168, 56, 0.2);
        }
        .badge-hot {
            background: rgba(217, 74, 74, 0.1);
            color: var(--accent);
            border-color: rgba(217, 74, 74, 0.18);
        }
        .badge i {
            font-size: 0.75rem;
        }

        /* ===== 卡片 ===== */
        .card {
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            overflow: hidden;
            transition: var(--transition);
            border: 1px solid var(--border-light);
            height: 100%;
            display: flex;
            flex-direction: column;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: rgba(26, 58, 92, 0.1);
        }
        .card-img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            display: block;
        }
        .card-body {
            padding: 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .card-title {
            font-size: 1.15rem;
            font-weight: 700;
            line-height: 1.4;
            color: var(--text-primary);
        }
        .card-text {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
            flex: 1;
        }
        .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.82rem;
            color: var(--text-light);
            padding-top: 8px;
            border-top: 1px solid var(--border-light);
        }
        .card-meta i {
            margin-right: 4px;
        }
        .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 4px;
        }
        .card-link {
            color: var(--primary-light);
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            font-size: 0.9rem;
        }
        .card-link:hover {
            color: var(--primary);
            gap: 10px;
        }

        /* ===== 网格 ===== */
        .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;
        }
        @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 1fr;
                gap: 20px;
            }
        }
        @media (max-width: 520px) {
            .grid-2,
            .grid-3,
            .grid-4 {
                grid-template-columns: 1fr;
                gap: 18px;
            }
        }

        /* ===== 列表图文 ===== */
        .list-article {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .list-article-item {
            display: flex;
            gap: 20px;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            padding: 20px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            align-items: flex-start;
        }
        .list-article-item:hover {
            box-shadow: var(--shadow-md);
            transform: translateX(4px);
        }
        .list-article-img {
            width: 180px;
            min-height: 120px;
            border-radius: var(--radius-sm);
            object-fit: cover;
            flex-shrink: 0;
        }
        .list-article-content {
            flex: 1;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .list-article-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--text-primary);
            line-height: 1.4;
        }
        .list-article-title a {
            color: inherit;
        }
        .list-article-title a:hover {
            color: var(--primary-light);
        }
        .list-article-desc {
            font-size: 0.9rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        .list-article-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.82rem;
            color: var(--text-light);
        }
        @media (max-width: 768px) {
            .list-article-item {
                flex-direction: column;
                padding: 16px;
            }
            .list-article-img {
                width: 100%;
                min-height: 160px;
            }
        }

        /* ===== 统计块 ===== */
        .stat-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .stat-item {
            text-align: center;
            padding: 28px 16px;
            background: rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-md);
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: var(--transition);
        }
        .stat-item:hover {
            background: rgba(255, 255, 255, 0.1);
            transform: translateY(-4px);
        }
        .stat-number {
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--secondary);
            line-height: 1.2;
        }
        .stat-label {
            font-size: 0.92rem;
            color: rgba(255, 255, 255, 0.75);
            margin-top: 8px;
        }
        @media (max-width: 768px) {
            .stat-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .stat-number {
                font-size: 2rem;
            }
        }
        @media (max-width: 520px) {
            .stat-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(26, 58, 92, 0.15);
        }
        .faq-question {
            padding: 18px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            transition: var(--transition);
            user-select: none;
            gap: 16px;
        }
        .faq-question i {
            font-size: 1.1rem;
            color: var(--text-light);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
            color: var(--primary);
        }
        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: all 0.35s ease;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-answer-inner {
            padding-bottom: 20px;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
        }
        @media (max-width: 520px) {
            .faq-question {
                padding: 14px 16px;
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 16px;
            }
        }

        /* ===== CTA 区块 ===== */
        .cta-block {
            background: var(--primary);
            border-radius: var(--radius-lg);
            padding: 64px 48px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            top: -50%;
            right: -20%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(232, 168, 56, 0.12) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-block::after {
            content: '';
            position: absolute;
            bottom: -30%;
            left: -10%;
            width: 300px;
            height: 300px;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.05) 0%, transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }
        .cta-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
            position: relative;
            z-index: 1;
        }
        .cta-desc {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 560px;
            margin: 0 auto 32px;
            position: relative;
            z-index: 1;
            line-height: 1.7;
        }
        .cta-block .btn {
            position: relative;
            z-index: 1;
        }
        @media (max-width: 768px) {
            .cta-block {
                padding: 40px 24px;
            }
            .cta-title {
                font-size: 1.5rem;
            }
            .cta-desc {
                font-size: 0.95rem;
            }
        }

        /* ===== 板块间距 ===== */
        .section {
            padding: 72px 0;
        }
        .section-sm {
            padding: 48px 0;
        }
        @media (max-width: 768px) {
            .section {
                padding: 48px 0;
            }
            .section-sm {
                padding: 32px 0;
            }
        }

        /* ===== 背景变体 ===== */
        .bg-white {
            background: var(--bg-white);
        }
        .bg-light {
            background: var(--bg-light);
        }
        .bg-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }
        .bg-dark .section-title {
            color: var(--text-white);
        }
        .bg-dark .section-desc {
            color: rgba(255, 255, 255, 0.75);
        }

        /* ===== Header / 导航 ===== */
        header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--bg-white);
            border-bottom: 1px solid var(--border);
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
            height: var(--header-h);
        }
        header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .logo {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            display: flex;
            align-items: baseline;
            gap: 2px;
            letter-spacing: -0.5px;
        }
        .logo span {
            color: var(--secondary);
        }
        .logo .logo-sub {
            font-size: 0.7rem;
            font-weight: 400;
            color: var(--text-light);
            letter-spacing: 0;
            margin-left: 4px;
        }
        .logo:hover {
            color: var(--primary);
        }
        .nav-main {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-main a {
            padding: 8px 16px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: 8px;
            transition: var(--transition);
            position: relative;
        }
        .nav-main a:hover {
            color: var(--primary);
            background: rgba(26, 58, 92, 0.05);
        }
        .nav-main a.active {
            color: var(--primary);
            background: rgba(26, 58, 92, 0.08);
            font-weight: 600;
        }
        .nav-main a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--secondary);
            border-radius: 2px;
        }
        .nav-main .nav-cta {
            background: var(--secondary);
            color: var(--text-primary);
            font-weight: 600;
            padding: 8px 20px;
            border-radius: 8px;
            margin-left: 8px;
        }
        .nav-main .nav-cta:hover {
            background: var(--secondary-light);
            color: var(--text-primary);
            transform: translateY(-1px);
            box-shadow: 0 4px 16px rgba(232, 168, 56, 0.3);
        }
        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: 6px;
            background: transparent;
        }
        .nav-toggle span {
            display: block;
            width: 24px;
            height: 2.5px;
            background: var(--text-primary);
            border-radius: 2px;
            transition: 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);
        }
        @media (max-width: 900px) {
            .nav-toggle {
                display: flex;
            }
            .nav-main {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                box-shadow: 0 12px 32px rgba(0, 0, 0, 0.1);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                border-bottom: 1px solid var(--border);
                align-items: stretch;
            }
            .nav-main.open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .nav-main a {
                padding: 12px 16px;
                font-size: 1rem;
            }
            .nav-main .nav-cta {
                margin-left: 0;
                margin-top: 8px;
                text-align: center;
            }
            .nav-main a.active::after {
                display: none;
            }
        }
        @media (max-width: 520px) {
            :root {
                --header-h: 60px;
            }
            .logo {
                font-size: 1.2rem;
            }
            .logo .logo-sub {
                font-size: 0.6rem;
            }
            .nav-main a {
                padding: 10px 14px;
            }
        }

        /* ===== Hero / 横幅 ===== */
        .hero-category {
            position: relative;
            padding: 100px 0 80px;
            background: var(--bg-dark);
            color: var(--text-white);
            overflow: hidden;
        }
        .hero-category .hero-bg {
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.3;
            z-index: 0;
        }
        .hero-category .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 42, 68, 0.85) 0%, rgba(26, 58, 92, 0.7) 100%);
            z-index: 1;
        }
        .hero-category .container {
            position: relative;
            z-index: 2;
        }
        .hero-category .badge {
            display: inline-flex;
            margin-bottom: 16px;
            background: rgba(232, 168, 56, 0.2);
            color: var(--secondary);
            border-color: rgba(232, 168, 56, 0.3);
        }
        .hero-category h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 20px;
            max-width: 700px;
        }
        .hero-category h1 span {
            color: var(--secondary);
        }
        .hero-category p {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.8);
            max-width: 600px;
            line-height: 1.7;
            margin-bottom: 28px;
        }
        .hero-category .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }
        @media (max-width: 768px) {
            .hero-category {
                padding: 64px 0 56px;
            }
            .hero-category h1 {
                font-size: 1.8rem;
            }
            .hero-category p {
                font-size: 0.95rem;
            }
        }
        @media (max-width: 520px) {
            .hero-category {
                padding: 48px 0 40px;
            }
            .hero-category h1 {
                font-size: 1.5rem;
            }
            .hero-category .hero-actions {
                flex-direction: column;
            }
        }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-light);
            padding: 12px 0;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--primary-light);
        }
        .breadcrumb span {
            color: var(--text-secondary);
        }
        .breadcrumb i {
            font-size: 0.7rem;
            color: var(--text-light);
        }

        /* ===== 标签筛选 ===== */
        .filter-tabs {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 36px;
        }
        .filter-tab {
            padding: 8px 20px;
            border-radius: 20px;
            font-size: 0.88rem;
            font-weight: 500;
            color: var(--text-secondary);
            background: var(--bg-white);
            border: 1px solid var(--border);
            transition: var(--transition);
            cursor: pointer;
        }
        .filter-tab:hover {
            border-color: var(--primary-light);
            color: var(--primary-light);
        }
        .filter-tab.active {
            background: var(--primary);
            color: var(--text-white);
            border-color: var(--primary);
        }

        /* ===== 步骤流程 ===== */
        .steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            counter-reset: step;
        }
        .step-item {
            text-align: center;
            padding: 32px 20px;
            background: var(--bg-white);
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            position: relative;
        }
        .step-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .step-item::before {
            counter-increment: step;
            content: counter(step);
            display: flex;
            align-items: center;
            justify-content: center;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--text-white);
            font-size: 1.3rem;
            font-weight: 700;
            margin: 0 auto 16px;
        }
        .step-item:nth-child(2)::before {
            background: var(--secondary);
            color: var(--text-primary);
        }
        .step-item:nth-child(3)::before {
            background: var(--accent);
        }
        .step-item:nth-child(4)::before {
            background: var(--primary-light);
        }
        .step-title {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
        }
        .step-desc {
            font-size: 0.88rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }
        @media (max-width: 900px) {
            .steps {
                grid-template-columns: repeat(2, 1fr);
            }
        }
        @media (max-width: 520px) {
            .steps {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .step-item {
                padding: 24px 16px;
            }
        }

        /* ===== 分割线 ===== */
        .divider {
            height: 1px;
            background: var(--border);
            margin: 0;
            border: none;
        }

        /* ===== Footer ===== */
        footer {
            background: var(--bg-dark);
            color: rgba(255, 255, 255, 0.75);
            padding: 56px 0 0;
        }
        footer .logo {
            color: var(--text-white);
            margin-bottom: 12px;
        }
        footer .logo span {
            color: var(--secondary);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.6fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
            max-width: 340px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            padding: 6px 0;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--secondary);
            padding-left: 4px;
        }
        .footer-col a i {
            width: 20px;
            margin-right: 4px;
        }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.45);
            flex-wrap: wrap;
            gap: 12px;
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.5);
        }
        .footer-bottom a:hover {
            color: var(--secondary);
        }
        @media (max-width: 900px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
        }
        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            footer {
                padding: 40px 0 0;
            }
        }

        /* ===== 额外组件 ===== */
        .text-center {
            text-align: center;
        }
        .mt-16 {
            margin-top: 16px;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-32 {
            margin-top: 32px;
        }
        .mt-48 {
            margin-top: 48px;
        }
        .gap-8 {
            gap: 8px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .flex-wrap {
            flex-wrap: wrap;
        }

        /* ===== Tag 标签云 ===== */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
        }
        .tag-cloud a {
            padding: 6px 18px;
            border-radius: 20px;
            background: var(--bg-white);
            border: 1px solid var(--border);
            color: var(--text-secondary);
            font-size: 0.85rem;
            font-weight: 500;
            transition: var(--transition);
        }
        .tag-cloud a:hover {
            background: var(--primary);
            color: var(--text-white);
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        /* ===== 文章内页导航 ===== */
        .page-nav {
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            padding-top: 24px;
            border-top: 1px solid var(--border);
            margin-top: 32px;
        }
        .page-nav a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 8px 16px;
            border-radius: 8px;
            background: var(--bg-white);
            border: 1px solid var(--border);
            color: var(--text-secondary);
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .page-nav a:hover {
            border-color: var(--primary-light);
            color: var(--primary-light);
        }

/* roulang page: article */
/* ===== DESIGN VARIABLES ===== */
        :root {
            --primary: #1a5cff;
            --primary-dark: #0d47c4;
            --primary-light: #e8f0ff;
            --secondary: #ff6a00;
            --secondary-light: #fff0e0;
            --accent: #00c9a7;
            --bg: #f8faff;
            --bg-white: #ffffff;
            --bg-gray: #f0f4fc;
            --bg-dark: #0b1a33;
            --bg-card: #ffffff;
            --text: #1a2a4a;
            --text-light: #5a6e8a;
            --text-lighter: #8a9bb5;
            --text-white: #ffffff;
            --border: #e2e9f5;
            --border-light: #f0f4fc;
            --radius: 16px;
            --radius-sm: 10px;
            --radius-xs: 6px;
            --radius-lg: 24px;
            --shadow: 0 4px 20px rgba(26, 92, 255, 0.08);
            --shadow-hover: 0 12px 40px rgba(26, 92, 255, 0.16);
            --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.04);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --nav-height: 72px;
            --topbar-height: 40px;
            --max-width: 1200px;
            --gap: 24px;
            --gap-lg: 40px;
        }

        /* ===== RESET & BASE ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--primary-dark);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            outline: none;
            border: none;
        }
        button {
            cursor: pointer;
            background: none;
        }
        ul,
        ol {
            list-style: none;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text);
        }
        p {
            margin-bottom: 1em;
            color: var(--text-light);
        }
        p:last-child {
            margin-bottom: 0;
        }

        /* ===== CONTAINER ===== */
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* ===== TOP BAR ===== */
        .topbar {
            background: var(--bg-dark);
            color: var(--text-lighter);
            font-size: 13px;
            height: var(--topbar-height);
            display: flex;
            align-items: center;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }
        .topbar .container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }
        .topbar-left span {
            margin-right: 20px;
            color: var(--text-lighter);
        }
        .topbar-left i {
            margin-right: 6px;
            color: var(--accent);
        }
        .topbar-right a {
            color: var(--text-lighter);
            margin-left: 16px;
            font-size: 13px;
            transition: var(--transition);
        }
        .topbar-right a:hover {
            color: var(--text-white);
        }
        .topbar-right i {
            margin-right: 4px;
        }

        /* ===== HEADER / NAV ===== */
        header {
            background: var(--bg-white);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.02);
        }
        header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: var(--nav-height);
        }
        .logo {
            font-size: 26px;
            font-weight: 800;
            color: var(--text);
            display: flex;
            align-items: baseline;
            gap: 2px;
            letter-spacing: -0.5px;
        }
        .logo span {
            color: var(--primary);
        }
        .logo .logo-sub {
            font-size: 14px;
            font-weight: 400;
            color: var(--text-lighter);
            margin-left: 8px;
            letter-spacing: 0;
        }
        .logo:hover {
            color: var(--text);
        }

        .nav-main {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .nav-main a {
            padding: 8px 18px;
            border-radius: var(--radius-xs);
            font-size: 15px;
            font-weight: 500;
            color: var(--text-light);
            transition: var(--transition);
            position: relative;
        }
        .nav-main a:hover {
            color: var(--primary);
            background: var(--primary-light);
        }
        .nav-main a.active {
            color: var(--primary);
            background: var(--primary-light);
            font-weight: 600;
        }
        .nav-main a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--primary);
            border-radius: 2px;
        }
        .nav-main a.nav-cta {
            background: var(--secondary);
            color: #fff;
            padding: 8px 24px;
            border-radius: 50px;
            font-weight: 600;
            margin-left: 8px;
            box-shadow: 0 4px 12px rgba(255, 106, 0, 0.25);
        }
        .nav-main a.nav-cta:hover {
            background: #e55d00;
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(255, 106, 0, 0.35);
        }
        .nav-main a.nav-cta i {
            margin-right: 6px;
            font-size: 13px;
        }

        .nav-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            padding: 8px;
            border-radius: var(--radius-xs);
            background: transparent;
            border: 1px solid var(--border);
        }
        .nav-toggle span {
            width: 24px;
            height: 2px;
            background: var(--text);
            border-radius: 2px;
            transition: var(--transition);
        }
        .nav-toggle:hover span {
            background: var(--primary);
        }

        /* ===== ARTICLE HERO ===== */
        .article-hero {
            background: var(--bg-dark);
            padding: 60px 0 50px;
            position: relative;
            overflow: hidden;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
        }
        .article-hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 26, 51, 0.92) 40%, rgba(11, 26, 51, 0.7) 100%);
            z-index: 1;
        }
        .article-hero .container {
            position: relative;
            z-index: 2;
        }
        .article-hero .breadcrumb {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            margin-bottom: 16px;
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .article-hero .breadcrumb a {
            color: rgba(255, 255, 255, 0.7);
        }
        .article-hero .breadcrumb a:hover {
            color: #fff;
        }
        .article-hero .breadcrumb span {
            color: rgba(255, 255, 255, 0.4);
        }
        .article-hero .post-category {
            display: inline-block;
            background: var(--secondary);
            color: #fff;
            font-size: 13px;
            font-weight: 600;
            padding: 4px 16px;
            border-radius: 50px;
            margin-bottom: 16px;
        }
        .article-hero h1 {
            font-size: 38px;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.25;
            max-width: 800px;
            margin-bottom: 16px;
        }
        .article-hero .post-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.7);
        }
        .article-hero .post-meta i {
            margin-right: 6px;
            color: var(--accent);
        }

        /* ===== ARTICLE MAIN ===== */
        .article-main {
            padding: 50px 0 60px;
            background: var(--bg);
        }
        .article-main .container {
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: var(--gap-lg);
        }
        .article-content {
            background: var(--bg-white);
            border-radius: var(--radius);
            padding: 40px 44px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
        }
        .article-content .post-body {
            font-size: 16.5px;
            line-height: 1.85;
            color: var(--text);
        }
        .article-content .post-body p {
            margin-bottom: 1.4em;
            color: var(--text);
        }
        .article-content .post-body h2 {
            font-size: 24px;
            margin-top: 36px;
            margin-bottom: 14px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--primary-light);
        }
        .article-content .post-body h3 {
            font-size: 20px;
            margin-top: 28px;
            margin-bottom: 10px;
        }
        .article-content .post-body ul,
        .article-content .post-body ol {
            margin-bottom: 1.4em;
            padding-left: 24px;
        }
        .article-content .post-body ul li {
            list-style: disc;
            margin-bottom: 6px;
            color: var(--text);
        }
        .article-content .post-body ol li {
            list-style: decimal;
            margin-bottom: 6px;
            color: var(--text);
        }
        .article-content .post-body a {
            color: var(--primary);
            text-decoration: underline;
            text-underline-offset: 2px;
        }
        .article-content .post-body a:hover {
            color: var(--primary-dark);
        }
        .article-content .post-body img {
            margin: 24px 0;
            border-radius: var(--radius-sm);
            box-shadow: var(--shadow);
        }
        .article-content .post-body blockquote {
            border-left: 4px solid var(--primary);
            background: var(--primary-light);
            padding: 16px 20px;
            margin: 20px 0;
            border-radius: 0 var(--radius-xs) var(--radius-xs) 0;
            color: var(--text-light);
            font-style: italic;
        }
        .article-content .post-body .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 30px;
            padding-top: 20px;
            border-top: 1px solid var(--border);
        }
        .article-content .post-body .tag-list .tag {
            background: var(--primary-light);
            color: var(--primary);
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 500;
        }
        .article-content .post-not-found {
            text-align: center;
            padding: 60px 20px;
        }
        .article-content .post-not-found i {
            font-size: 56px;
            color: var(--text-lighter);
            margin-bottom: 20px;
            display: block;
        }
        .article-content .post-not-found h2 {
            font-size: 24px;
            color: var(--text);
            margin-bottom: 12px;
        }
        .article-content .post-not-found p {
            color: var(--text-light);
            margin-bottom: 24px;
        }
        .article-content .post-not-found .btn-back {
            display: inline-block;
            padding: 10px 32px;
            background: var(--primary);
            color: #fff;
            border-radius: 50px;
            font-weight: 600;
        }
        .article-content .post-not-found .btn-back:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-hover);
        }

        /* ===== SIDEBAR ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: var(--gap);
        }
        .sidebar-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            padding: 24px 28px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-light);
        }
        .sidebar-card h3 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 16px;
            padding-bottom: 12px;
            border-bottom: 2px solid var(--primary-light);
            color: var(--text);
        }
        .sidebar-card .side-list li {
            padding: 10px 0;
            border-bottom: 1px solid var(--border-light);
        }
        .sidebar-card .side-list li:last-child {
            border-bottom: none;
        }
        .sidebar-card .side-list a {
            display: flex;
            gap: 12px;
            align-items: flex-start;
            color: var(--text);
            font-size: 14px;
            line-height: 1.5;
        }
        .sidebar-card .side-list a:hover {
            color: var(--primary);
        }
        .sidebar-card .side-list a .num {
            flex-shrink: 0;
            width: 26px;
            height: 26px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 13px;
            font-weight: 700;
        }
        .sidebar-card .side-list a .num.top {
            background: var(--secondary);
            color: #fff;
        }
        .sidebar-card .side-cta {
            display: block;
            text-align: center;
            padding: 12px 0;
            background: var(--secondary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            margin-top: 12px;
            transition: var(--transition);
        }
        .sidebar-card .side-cta:hover {
            background: #e55d00;
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 106, 0, 0.3);
            color: #fff;
        }
        .sidebar-card .side-cta i {
            margin-right: 8px;
        }
        .sidebar-card .cover-img {
            border-radius: var(--radius-sm);
            margin-bottom: 12px;
            width: 100%;
            height: 140px;
            object-fit: cover;
        }

        /* ===== RELATED SECTION ===== */
        .related-section {
            background: var(--bg-white);
            padding: 50px 0;
            border-top: 1px solid var(--border);
        }
        .related-section .section-title {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 28px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .related-section .section-title i {
            color: var(--primary);
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--gap);
        }
        .related-card {
            background: var(--bg);
            border-radius: var(--radius-sm);
            overflow: hidden;
            border: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .related-card img {
            width: 100%;
            height: 160px;
            object-fit: cover;
            border-radius: 0;
        }
        .related-card .card-body {
            padding: 16px 18px 20px;
        }
        .related-card .card-body h4 {
            font-size: 16px;
            font-weight: 600;
            margin-bottom: 6px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-body h4 a {
            color: var(--text);
        }
        .related-card .card-body h4 a:hover {
            color: var(--primary);
        }
        .related-card .card-body .meta-sm {
            font-size: 13px;
            color: var(--text-lighter);
            display: flex;
            gap: 12px;
        }
        .related-card .card-body .meta-sm i {
            margin-right: 4px;
        }

        /* ===== CTA SECTION ===== */
        .cta-section {
            background: var(--bg-dark);
            padding: 50px 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            position: relative;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(11, 26, 51, 0.88);
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .cta-section h2 {
            font-size: 30px;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 12px;
        }
        .cta-section p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 600px;
            margin: 0 auto 28px;
        }
        .cta-section .cta-btn {
            display: inline-block;
            padding: 14px 44px;
            background: var(--secondary);
            color: #fff;
            border-radius: 50px;
            font-size: 18px;
            font-weight: 700;
            box-shadow: 0 6px 24px rgba(255, 106, 0, 0.35);
            transition: var(--transition);
        }
        .cta-section .cta-btn:hover {
            background: #e55d00;
            transform: translateY(-3px);
            box-shadow: 0 10px 32px rgba(255, 106, 0, 0.45);
            color: #fff;
        }
        .cta-section .cta-btn i {
            margin-right: 8px;
        }

        /* ===== FOOTER ===== */
        footer {
            background: var(--bg-dark);
            color: var(--text-lighter);
            padding: 50px 0 30px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }
        footer .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: var(--gap-lg);
            margin-bottom: 36px;
        }
        footer .footer-brand .logo {
            color: var(--text-white);
            font-size: 24px;
            margin-bottom: 12px;
            display: inline-block;
        }
        footer .footer-brand .logo span {
            color: var(--primary);
        }
        footer .footer-brand p {
            font-size: 14px;
            color: var(--text-lighter);
            line-height: 1.7;
            max-width: 360px;
        }
        footer .footer-col h4 {
            font-size: 16px;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
        }
        footer .footer-col a {
            display: block;
            font-size: 14px;
            color: var(--text-lighter);
            padding: 5px 0;
            transition: var(--transition);
        }
        footer .footer-col a:hover {
            color: var(--primary-light);
            padding-left: 4px;
        }
        footer .footer-col a i {
            width: 20px;
            margin-right: 6px;
            color: var(--accent);
        }
        footer .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: 24px;
            display: flex;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
            font-size: 13px;
            color: var(--text-lighter);
        }
        footer .footer-bottom a {
            color: var(--text-lighter);
        }
        footer .footer-bottom a:hover {
            color: var(--text-white);
        }

        /* ===== RESPONSIVE ===== */
        @media (max-width: 1024px) {
            .article-main .container {
                grid-template-columns: 1fr;
            }
            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: var(--gap);
            }
            .related-grid {
                grid-template-columns: 1fr 1fr;
            }
            footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 30px;
            }
        }

        @media (max-width: 768px) {
            :root {
                --nav-height: 64px;
                --topbar-height: 36px;
            }
            .topbar-left span {
                font-size: 12px;
            }
            .topbar-right a {
                font-size: 12px;
                margin-left: 10px;
            }
            .nav-main {
                display: none;
                position: absolute;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: var(--bg-white);
                flex-direction: column;
                padding: 16px 20px;
                border-bottom: 1px solid var(--border);
                box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
                gap: 2px;
                max-height: calc(100vh - var(--nav-height));
                overflow-y: auto;
            }
            .nav-main.open {
                display: flex;
            }
            .nav-main a {
                padding: 12px 16px;
                font-size: 15px;
                border-radius: var(--radius-xs);
                width: 100%;
            }
            .nav-main a.nav-cta {
                margin-left: 0;
                margin-top: 8px;
                text-align: center;
            }
            .nav-main a.active::after {
                display: none;
            }
            .nav-toggle {
                display: flex;
            }
            .article-hero {
                padding: 40px 0 36px;
            }
            .article-hero h1 {
                font-size: 26px;
            }
            .article-content {
                padding: 24px 20px;
            }
            .article-content .post-body {
                font-size: 15px;
            }
            .article-content .post-body h2 {
                font-size: 20px;
            }
            .article-content .post-body h3 {
                font-size: 17px;
            }
            .article-sidebar {
                grid-template-columns: 1fr;
            }
            .related-grid {
                grid-template-columns: 1fr;
            }
            footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            footer .footer-bottom {
                flex-direction: column;
                align-items: center;
                text-align: center;
            }
            .cta-section h2 {
                font-size: 24px;
            }
            .cta-section .cta-btn {
                font-size: 16px;
                padding: 12px 32px;
            }
        }

        @media (max-width: 520px) {
            .article-hero h1 {
                font-size: 22px;
            }
            .article-hero .post-meta {
                flex-direction: column;
                gap: 8px;
                font-size: 13px;
            }
            .article-content {
                padding: 16px 14px;
            }
            .article-content .post-body {
                font-size: 14.5px;
            }
            .sidebar-card {
                padding: 18px 16px;
            }
            .related-card .card-body {
                padding: 12px 14px 16px;
            }
            .related-card .card-body h4 {
                font-size: 15px;
            }
            .logo {
                font-size: 20px;
            }
            .logo .logo-sub {
                font-size: 12px;
                margin-left: 4px;
            }
            .topbar-left span {
                font-size: 11px;
            }
            .topbar-right a {
                font-size: 11px;
                margin-left: 6px;
            }
        }

        /* ===== UTILITY ===== */
        .text-center {
            text-align: center;
        }
        .mt-1 {
            margin-top: 8px;
        }
        .mt-2 {
            margin-top: 16px;
        }
        .mt-3 {
            margin-top: 24px;
        }
        .mb-2 {
            margin-bottom: 16px;
        }
        .mb-3 {
            margin-bottom: 24px;
        }
        .gap-1 {
            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;
        }