/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0b1124;
            --primary-light: #1a2d54;
            --primary-mid: #0f1f3d;
            --accent: #2563eb;
            --accent-light: #60a5fa;
            --accent-dark: #1d4ed8;
            --gold: #f59e0b;
            --gold-light: #fcd34d;
            --gold-dark: #b45309;
            --text: #1e293b;
            --text-light: #64748b;
            --text-white: #f1f5f9;
            --bg: #f0f4f8;
            --bg-dark: #060e1f;
            --bg-card: #ffffff;
            --bg-card-alt: #f8fafc;
            --border: #e2e8f0;
            --border-dark: #1e3a5f;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow: 0 4px 24px rgba(0,0,0,0.08);
            --shadow-lg: 0 12px 48px rgba(0,0,0,0.12);
            --shadow-glow: 0 0 40px rgba(37,99,235,0.15);
            --radius: 16px;
            --radius-sm: 8px;
            --radius-xs: 4px;
            --transition: all 0.3s ease;
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --max-width: 1200px;
            --header-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);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--accent); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--accent-dark); }
        a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 2px; }
        button, input, textarea, select { font-family: inherit; font-size: inherit; }
        button { cursor: pointer; border: none; background: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; color: var(--primary); font-weight: 700; }
        h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
        h2 { font-size: clamp(1.5rem, 3.5vw, 2.2rem); }
        h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }
        h4 { font-size: 1.1rem; }
        p { margin-bottom: 1rem; }
        .container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
        .section { padding: 80px 0; }
        .section-title { text-align: center; margin-bottom: 48px; }
        .section-title h2 { margin-bottom: 12px; }
        .section-title p { color: var(--text-light); font-size: 1.1rem; max-width: 640px; margin: 0 auto; }
        .text-center { text-align: center; }
        .text-gold { color: var(--gold); }
        .text-accent { color: var(--accent); }
        .mb-1 { margin-bottom: 8px; }
        .mb-2 { margin-bottom: 16px; }
        .mb-3 { margin-bottom: 24px; }
        .mb-4 { margin-bottom: 32px; }
        .mb-5 { margin-bottom: 48px; }
        .mt-2 { margin-top: 16px; }
        .mt-3 { margin-top: 24px; }
        .mt-4 { margin-top: 32px; }
        .mt-5 { margin-top: 48px; }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex; align-items: center; justify-content: center; gap: 8px;
            padding: 12px 32px; border-radius: 50px; font-weight: 600; font-size: 1rem;
            transition: var(--transition); border: 2px solid transparent;
            white-space: nowrap;
        }
        .btn-primary {
            background: var(--accent); color: #fff; border-color: var(--accent);
        }
        .btn-primary:hover {
            background: var(--accent-dark); border-color: var(--accent-dark); color: #fff;
            transform: translateY(-2px); box-shadow: 0 8px 24px rgba(37,99,235,0.35);
        }
        .btn-primary:active { transform: translateY(0); box-shadow: none; }
        .btn-outline {
            background: transparent; color: var(--text-white); border-color: rgba(255,255,255,0.5);
        }
        .btn-outline:hover {
            background: rgba(255,255,255,0.1); border-color: #fff; color: #fff;
            transform: translateY(-2px);
        }
        .btn-outline:active { transform: translateY(0); }
        .btn-gold {
            background: var(--gold); color: var(--primary); border-color: var(--gold);
        }
        .btn-gold:hover {
            background: var(--gold-light); border-color: var(--gold-light); color: var(--primary);
            transform: translateY(-2px); box-shadow: 0 8px 24px rgba(245,158,11,0.35);
        }
        .btn-sm { padding: 8px 20px; font-size: 0.9rem; }
        .btn-lg { padding: 16px 40px; font-size: 1.1rem; }

        /* ===== Tags / Badges ===== */
        .tag {
            display: inline-block; padding: 4px 14px; border-radius: 50px; font-size: 0.8rem;
            font-weight: 500; background: var(--bg); color: var(--text-light);
            transition: var(--transition);
        }
        .tag-accent { background: rgba(37,99,235,0.1); color: var(--accent); }
        .tag-gold { background: rgba(245,158,11,0.12); color: var(--gold-dark); }
        .tag-green { background: rgba(16,185,129,0.1); color: #047857; }
        .tag:hover { opacity: 0.8; }
        .badge {
            display: inline-flex; align-items: center; gap: 4px;
            padding: 2px 12px; border-radius: 50px; font-size: 0.75rem; font-weight: 600;
            background: var(--accent); color: #fff;
        }

        /* ===== Cards ===== */
        .card {
            background: var(--bg-card); border-radius: var(--radius);
            box-shadow: var(--shadow-sm); border: 1px solid var(--border);
            transition: var(--transition); overflow: hidden;
        }
        .card:hover {
            box-shadow: var(--shadow); transform: translateY(-4px);
        }
        .card-img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
        .card-body { padding: 24px; }
        .card-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; color: var(--primary); }
        .card-text { color: var(--text-light); font-size: 0.95rem; line-height: 1.6; }
        .card-meta { display: flex; align-items: center; gap: 16px; font-size: 0.85rem; color: var(--text-light); margin-top: 12px; }

        /* ===== Header & Navigation ===== */
        .header {
            position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
            background: rgba(11,17,36,0.92); backdrop-filter: blur(20px);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            height: var(--header-h); transition: var(--transition);
        }
        .header.scrolled { background: rgba(11,17,36,0.98); box-shadow: 0 4px 30px rgba(0,0,0,0.3); }
        .header-inner {
            display: flex; align-items: center; justify-content: space-between;
            height: var(--header-h); max-width: var(--max-width); margin: 0 auto; padding: 0 24px;
        }
        .logo {
            display: flex; align-items: center; gap: 10px; font-size: 1.3rem; font-weight: 800;
            color: #fff; letter-spacing: -0.5px;
        }
        .logo i { color: var(--gold); font-size: 1.5rem; }
        .logo:hover { color: var(--gold-light); }
        .logo span { background: linear-gradient(135deg, #fff 30%, var(--gold-light) 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .nav { display: flex; align-items: center; gap: 32px; }
        .nav a {
            font-size: 0.95rem; font-weight: 500; color: rgba(255,255,255,0.75);
            position: relative; padding: 4px 0; transition: var(--transition);
        }
        .nav a::after {
            content: ''; position: absolute; bottom: -4px; left: 0; right: 0; height: 2px;
            background: var(--gold); transform: scaleX(0); transition: transform 0.3s ease;
        }
        .nav a:hover { color: #fff; }
        .nav a:hover::after { transform: scaleX(1); }
        .nav a.active { color: #fff; }
        .nav a.active::after { transform: scaleX(1); background: var(--accent); }
        .nav-cta .btn { padding: 8px 20px; font-size: 0.9rem; }
        .menu-toggle { display: none; color: #fff; font-size: 1.5rem; cursor: pointer; padding: 4px; }

        /* ===== Hero ===== */
        .hero {
            min-height: 100vh; display: flex; align-items: center; justify-content: center;
            background: linear-gradient(135deg, var(--bg-dark) 0%, var(--primary) 50%, #0a1e3d 100%);
            position: relative; overflow: hidden; padding: 120px 0 80px;
        }
        .hero::before {
            content: ''; position: absolute; inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.25; mix-blend-mode: overlay;
        }
        .hero::after {
            content: ''; position: absolute; inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(37,99,235,0.15) 0%, transparent 60%),
                        radial-gradient(ellipse at 70% 30%, rgba(245,158,11,0.08) 0%, transparent 50%);
        }
        .hero-content { position: relative; z-index: 2; text-align: center; max-width: 820px; padding: 0 24px; }
        .hero-badge {
            display: inline-flex; align-items: center; gap: 8px;
            padding: 6px 20px; border-radius: 50px; font-size: 0.85rem; font-weight: 500;
            background: rgba(255,255,255,0.08); color: var(--gold-light);
            border: 1px solid rgba(255,255,255,0.1); margin-bottom: 24px;
            backdrop-filter: blur(10px);
        }
        .hero h1 {
            color: #fff; font-size: clamp(2.2rem, 5.5vw, 3.8rem); font-weight: 800;
            line-height: 1.15; margin-bottom: 20px; letter-spacing: -1px;
        }
        .hero h1 span { background: linear-gradient(135deg, var(--gold-light), var(--accent-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .hero p {
            color: rgba(255,255,255,0.7); font-size: clamp(1rem, 2vw, 1.2rem);
            max-width: 600px; margin: 0 auto 36px; line-height: 1.8;
        }
        .hero-actions { display: flex; align-items: center; justify-content: center; gap: 16px; flex-wrap: wrap; }
        .hero-stats {
            display: flex; align-items: center; justify-content: center; gap: 40px;
            margin-top: 48px; padding-top: 32px; border-top: 1px solid rgba(255,255,255,0.08);
        }
        .hero-stat { text-align: center; }
        .hero-stat-num { font-size: 2rem; font-weight: 800; color: #fff; }
        .hero-stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.5); margin-top: 4px; }

        /* ===== Features Section ===== */
        .features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .feature-card {
            background: var(--bg-card); border-radius: var(--radius); padding: 32px 28px;
            border: 1px solid var(--border); transition: var(--transition);
            text-align: center;
        }
        .feature-card:hover {
            box-shadow: var(--shadow-lg); transform: translateY(-6px);
            border-color: var(--accent);
        }
        .feature-icon {
            width: 64px; height: 64px; border-radius: 16px; display: flex; align-items: center; justify-content: center;
            margin: 0 auto 20px; font-size: 1.8rem; color: #fff;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
        }
        .feature-card:nth-child(2) .feature-icon { background: linear-gradient(135deg, var(--gold), var(--gold-dark)); }
        .feature-card:nth-child(3) .feature-icon { background: linear-gradient(135deg, #10b981, #047857); }
        .feature-card h3 { margin-bottom: 10px; font-size: 1.2rem; }
        .feature-card p { color: var(--text-light); font-size: 0.95rem; margin-bottom: 0; }

        /* ===== Category Section ===== */
        .category-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .category-card {
            border-radius: var(--radius); overflow: hidden; position: relative;
            background: var(--bg-card); border: 1px solid var(--border);
            transition: var(--transition); cursor: pointer;
        }
        .category-card:hover {
            box-shadow: var(--shadow-lg); transform: translateY(-6px);
        }
        .category-card-img {
            width: 100%; aspect-ratio: 16/10; object-fit: cover;
            transition: var(--transition);
        }
        .category-card:hover .category-card-img { transform: scale(1.05); }
        .category-card-overlay {
            position: absolute; bottom: 0; left: 0; right: 0;
            padding: 24px 20px 20px;
            background: linear-gradient(transparent, rgba(0,0,0,0.75));
            color: #fff;
        }
        .category-card-overlay h3 { font-size: 1.15rem; color: #fff; margin-bottom: 4px; }
        .category-card-overlay p { font-size: 0.85rem; color: rgba(255,255,255,0.7); margin-bottom: 0; }
        .category-card .tag { position: absolute; top: 16px; left: 16px; z-index: 2; background: rgba(0,0,0,0.5); color: #fff; backdrop-filter: blur(8px); border: 1px solid rgba(255,255,255,0.15); }

        /* ===== Latest News / CMS List ===== */
        .news-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
        .news-card {
            display: flex; background: var(--bg-card); border-radius: var(--radius);
            border: 1px solid var(--border); overflow: hidden;
            transition: var(--transition);
        }
        .news-card:hover { box-shadow: var(--shadow); transform: translateY(-2px); }
        .news-card-img {
            width: 180px; min-height: 150px; object-fit: cover; flex-shrink: 0;
        }
        .news-card-body { padding: 20px 24px; display: flex; flex-direction: column; justify-content: center; }
        .news-card-body .tag { margin-bottom: 8px; align-self: flex-start; }
        .news-card-body h3 { font-size: 1.05rem; margin-bottom: 6px; }
        .news-card-body h3 a { color: var(--primary); }
        .news-card-body h3 a:hover { color: var(--accent); }
        .news-card-body p { font-size: 0.9rem; color: var(--text-light); margin-bottom: 8px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .news-card-body .card-meta { margin-top: 0; font-size: 0.8rem; }

        /* ===== Stats / Data Section ===== */
        .stats-section {
            background: var(--bg-dark); position: relative; overflow: hidden;
        }
        .stats-section::before {
            content: ''; position: absolute; inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
        }
        .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; position: relative; z-index: 1; }
        .stat-item { text-align: center; padding: 32px 16px; }
        .stat-item .num { font-size: 2.8rem; font-weight: 800; color: #fff; line-height: 1.1; }
        .stat-item .num span { color: var(--gold); }
        .stat-item .label { font-size: 0.95rem; color: rgba(255,255,255,0.55); margin-top: 8px; }
        .stat-item .icon { font-size: 2rem; color: var(--accent-light); margin-bottom: 16px; opacity: 0.6; }

        /* ===== Process / Steps ===== */
        .steps-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; position: relative; }
        .steps-grid::before {
            content: ''; position: absolute; top: 48px; left: 10%; right: 10%;
            height: 2px; background: linear-gradient(90deg, var(--accent), var(--gold), var(--accent));
            opacity: 0.2;
        }
        .step-card {
            text-align: center; position: relative; z-index: 1;
            background: var(--bg-card); border-radius: var(--radius); padding: 32px 20px;
            border: 1px solid var(--border); transition: var(--transition);
        }
        .step-card:hover { box-shadow: var(--shadow); transform: translateY(-4px); }
        .step-num {
            width: 56px; height: 56px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
            margin: 0 auto 16px; font-size: 1.3rem; font-weight: 800; color: #fff;
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
        }
        .step-card:nth-child(2) .step-num { background: linear-gradient(135deg, var(--gold), var(--gold-dark)); }
        .step-card:nth-child(3) .step-num { background: linear-gradient(135deg, #10b981, #047857); }
        .step-card:nth-child(4) .step-num { background: linear-gradient(135deg, #8b5cf6, #6d28d9); }
        .step-card h3 { font-size: 1.1rem; margin-bottom: 8px; }
        .step-card p { color: var(--text-light); font-size: 0.9rem; margin-bottom: 0; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 800px; margin: 0 auto; }
        .faq-item {
            background: var(--bg-card); border-radius: var(--radius-sm);
            border: 1px solid var(--border); margin-bottom: 12px;
            overflow: hidden; transition: var(--transition);
        }
        .faq-item:hover { border-color: var(--accent); }
        .faq-question {
            display: flex; align-items: center; justify-content: space-between;
            padding: 20px 24px; cursor: pointer; font-weight: 600; font-size: 1rem;
            color: var(--primary); transition: var(--transition);
            user-select: none;
        }
        .faq-question i { transition: transform 0.3s ease; color: var(--accent); font-size: 1.1rem; }
        .faq-item.active .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 24px; color: var(--text-light); font-size: 0.95rem; line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 300px; padding: 0 24px 20px;
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--bg-dark), var(--primary-light));
            position: relative; overflow: hidden;
        }
        .cta-section::before {
            content: ''; position: absolute; inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
        }
        .cta-content { position: relative; z-index: 1; text-align: center; max-width: 640px; margin: 0 auto; }
        .cta-content h2 { color: #fff; font-size: clamp(1.6rem, 3vw, 2.4rem); margin-bottom: 16px; }
        .cta-content p { color: rgba(255,255,255,0.65); font-size: 1.05rem; margin-bottom: 32px; }

        /* ===== Footer ===== */
        .footer {
            background: var(--bg-dark); color: rgba(255,255,255,0.5);
            padding: 48px 0 24px; border-top: 1px solid rgba(255,255,255,0.05);
        }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 32px; margin-bottom: 32px; }
        .footer-brand .logo { margin-bottom: 16px; }
        .footer-brand p { font-size: 0.9rem; line-height: 1.7; max-width: 320px; }
        .footer h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
        .footer ul li { margin-bottom: 10px; }
        .footer ul li a { color: rgba(255,255,255,0.45); font-size: 0.9rem; }
        .footer ul li a:hover { color: var(--gold-light); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.05); padding-top: 20px;
            display: flex; align-items: center; justify-content: space-between;
            font-size: 0.85rem; flex-wrap: wrap; gap: 12px;
        }
        .footer-bottom a { color: rgba(255,255,255,0.4); }
        .footer-bottom a:hover { color: var(--gold-light); }

        /* ===== Empty State ===== */
        .empty-state { text-align: center; padding: 48px 24px; color: var(--text-light); }
        .empty-state i { font-size: 3rem; color: var(--border); margin-bottom: 16px; display: block; }
        .empty-state p { font-size: 1rem; }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .category-grid { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .steps-grid { grid-template-columns: repeat(2, 1fr); }
            .steps-grid::before { display: none; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .section { padding: 56px 0; }
            .nav { display: none; }
            .nav.open { display: flex; flex-direction: column; position: absolute; top: var(--header-h); left: 0; right: 0; background: rgba(11,17,36,0.98); padding: 24px; gap: 16px; border-bottom: 1px solid rgba(255,255,255,0.06); }
            .menu-toggle { display: block; }
            .hero { padding: 100px 0 60px; min-height: auto; }
            .hero-stats { gap: 20px; flex-wrap: wrap; }
            .hero-stat-num { font-size: 1.5rem; }
            .features-grid { grid-template-columns: 1fr; }
            .category-grid { grid-template-columns: 1fr; }
            .news-grid { grid-template-columns: 1fr; }
            .news-card { flex-direction: column; }
            .news-card-img { width: 100%; height: 180px; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
            .stat-item .num { font-size: 2rem; }
            .steps-grid { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .hero-actions { flex-direction: column; align-items: stretch; }
            .hero-actions .btn { width: 100%; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .header-inner { padding: 0 16px; }
            .logo { font-size: 1.1rem; }
            .section-title p { font-size: 0.95rem; }
            .stat-item .num { font-size: 1.6rem; }
            .stat-item .label { font-size: 0.8rem; }
            .btn { padding: 10px 24px; font-size: 0.9rem; }
        }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0b1a2e;
            --primary-light: #112240;
            --primary-dark: #060f1a;
            --accent-gold: #f0b429;
            --accent-gold-light: #f7d96a;
            --accent-teal: #64ffda;
            --accent-teal-dim: #3d9b8a;
            --bg-body: #0a1628;
            --bg-card: #112240;
            --bg-card-hover: #1a2f4e;
            --bg-glass: rgba(17, 34, 64, 0.85);
            --text-primary: #e6f1ff;
            --text-secondary: #c0d0e0;
            --text-muted: #8892b0;
            --border-color: #1e3a5f;
            --border-glow: rgba(240, 180, 41, 0.25);
            --radius-sm: 6px;
            --radius-md: 10px;
            --radius-lg: 16px;
            --radius-xl: 24px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.25);
            --shadow-md: 0 6px 30px rgba(0, 0, 0, 0.35);
            --shadow-lg: 0 12px 50px rgba(0, 0, 0, 0.45);
            --shadow-glow: 0 0 30px rgba(240, 180, 41, 0.12);
            --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            --max-width: 1200px;
            --header-height: 72px;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
        }

        /* ===== Reset & Base ===== */
        *,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        body {
            font-family: var(--font-family);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            min-height: 100vh;
        }
        a {
            color: var(--accent-gold);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover,
        a:focus-visible {
            color: var(--accent-gold-light);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-md);
        }
        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: 1.25;
            font-weight: 700;
            color: var(--text-primary);
        }
        h1 {
            font-size: clamp(2rem, 5vw, 3.4rem);
        }
        h2 {
            font-size: clamp(1.5rem, 3.5vw, 2.4rem);
        }
        h3 {
            font-size: clamp(1.15rem, 2.2vw, 1.6rem);
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            margin-bottom: 0.75rem;
            color: var(--text-secondary);
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }
        .section {
            padding: 80px 0;
        }
        @media (max-width: 768px) {
            .section {
                padding: 50px 0;
            }
        }
        .section-title {
            text-align: center;
            margin-bottom: 16px;
            font-weight: 700;
            letter-spacing: -0.02em;
        }
        .section-subtitle {
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px;
            color: var(--text-muted);
            font-size: 1.05rem;
        }
        @media (max-width: 768px) {
            .section-subtitle {
                margin-bottom: 32px;
                font-size: 0.95rem;
            }
        }
        .tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.78rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            background: rgba(240, 180, 41, 0.12);
            color: var(--accent-gold);
            border: 1px solid rgba(240, 180, 41, 0.2);
            transition: all var(--transition);
        }
        .tag:hover {
            background: rgba(240, 180, 41, 0.22);
            border-color: rgba(240, 180, 41, 0.4);
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: 2px solid transparent;
            line-height: 1.2;
            white-space: nowrap;
        }
        .btn:focus-visible {
            outline: 2px solid var(--accent-gold);
            outline-offset: 3px;
        }
        .btn-gold {
            background: var(--accent-gold);
            color: #0a1628;
            border-color: var(--accent-gold);
        }
        .btn-gold:hover {
            background: var(--accent-gold-light);
            border-color: var(--accent-gold-light);
            color: #0a1628;
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(240, 180, 41, 0.3);
        }
        .btn-gold:active {
            transform: translateY(0);
            box-shadow: 0 2px 10px rgba(240, 180, 41, 0.2);
        }
        .btn-outline {
            background: transparent;
            color: var(--accent-gold);
            border-color: var(--accent-gold);
        }
        .btn-outline:hover {
            background: var(--accent-gold);
            color: #0a1628;
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(240, 180, 41, 0.2);
        }
        .btn-outline:active {
            transform: translateY(0);
        }
        .btn-sm {
            padding: 8px 20px;
            font-size: 0.85rem;
        }
        .btn-lg {
            padding: 16px 36px;
            font-size: 1.05rem;
        }

        /* ===== Header / Nav ===== */
        .header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(10, 22, 40, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-color);
            height: var(--header-height);
            display: flex;
            align-items: center;
            transition: background var(--transition);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.02em;
        }
        .logo i {
            color: var(--accent-gold);
            font-size: 1.4rem;
        }
        .logo span {
            background: linear-gradient(135deg, var(--accent-gold), var(--accent-gold-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .logo:hover {
            color: var(--text-primary);
        }
        .nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav a {
            padding: 8px 16px;
            border-radius: var(--radius-sm);
            font-size: 0.9rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            position: relative;
        }
        .nav a:hover {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.04);
        }
        .nav a.active {
            color: var(--accent-gold);
            background: rgba(240, 180, 41, 0.08);
        }
        .nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 3px;
            background: var(--accent-gold);
        }
        .nav .nav-cta {
            padding: 0;
            background: none;
        }
        .nav .nav-cta:hover {
            background: none;
        }
        .nav .nav-cta .btn {
            margin-left: 4px;
        }
        .nav-toggle {
            display: none;
            font-size: 1.5rem;
            color: var(--text-primary);
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-color);
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        @media (max-width: 820px) {
            .nav {
                position: fixed;
                top: var(--header-height);
                left: 0;
                right: 0;
                background: rgba(10, 22, 40, 0.98);
                backdrop-filter: blur(20px);
                flex-direction: column;
                padding: 16px 24px 24px;
                gap: 4px;
                border-bottom: 1px solid var(--border-color);
                transform: translateY(-110%);
                opacity: 0;
                pointer-events: none;
                transition: all 0.35s cubic-bezier(0.4, 0, 0.2, 1);
                box-shadow: var(--shadow-lg);
            }
            .nav.is-open {
                transform: translateY(0);
                opacity: 1;
                pointer-events: all;
            }
            .nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 1rem;
            }
            .nav a.active::after {
                display: none;
            }
            .nav a.active {
                border-left: 3px solid var(--accent-gold);
            }
            .nav .nav-cta {
                width: 100%;
                margin-top: 8px;
            }
            .nav .nav-cta .btn {
                width: 100%;
                justify-content: center;
                margin-left: 0;
            }
            .nav-toggle {
                display: inline-flex;
                align-items: center;
                justify-content: center;
            }
        }

        /* ===== Hero ===== */
        .hero {
            position: relative;
            min-height: 520px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            padding: 100px 0 80px;
            background: var(--primary-dark);
            overflow: hidden;
        }
        .hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.35;
            z-index: 0;
        }
        .hero-bg::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(10, 22, 40, 0.7) 0%, rgba(10, 22, 40, 0.3) 50%, rgba(10, 22, 40, 0.85) 100%);
        }
        .hero .container {
            position: relative;
            z-index: 1;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            border-radius: 50px;
            background: rgba(240, 180, 41, 0.12);
            border: 1px solid rgba(240, 180, 41, 0.2);
            color: var(--accent-gold);
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 24px;
            letter-spacing: 0.4px;
        }
        .hero h1 {
            font-weight: 800;
            letter-spacing: -0.03em;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #ffffff 40%, var(--accent-gold-light) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .hero p {
            font-size: 1.2rem;
            max-width: 680px;
            margin: 0 auto 36px;
            color: var(--text-secondary);
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }
        .hero-stats {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 40px 60px;
            margin-top: 50px;
            padding-top: 40px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
        }
        .hero-stat {
            text-align: center;
        }
        .hero-stat .num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent-gold);
            letter-spacing: -0.02em;
        }
        .hero-stat .label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-top: 2px;
            font-weight: 500;
        }
        @media (max-width: 768px) {
            .hero {
                min-height: 420px;
                padding: 80px 0 60px;
            }
            .hero p {
                font-size: 1.05rem;
            }
            .hero-stats {
                gap: 24px 36px;
                margin-top: 36px;
                padding-top: 28px;
            }
            .hero-stat .num {
                font-size: 1.5rem;
            }
        }

        /* ===== Intro / 分类简介 ===== */
        .intro-section {
            background: var(--primary-light);
        }
        .intro-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }
        .intro-content h2 {
            margin-bottom: 16px;
        }
        .intro-content p {
            font-size: 1.05rem;
            line-height: 1.8;
        }
        .intro-content .tag-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 24px;
        }
        .intro-image {
            border-radius: var(--radius-lg);
            overflow: hidden;
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border-color);
        }
        .intro-image img {
            width: 100%;
            height: 360px;
            object-fit: cover;
            display: block;
        }
        @media (max-width: 820px) {
            .intro-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .intro-image img {
                height: 240px;
            }
        }

        /* ===== 核心观测指南 卡片 ===== */
        .cards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(270px, 1fr));
            gap: 24px;
        }
        .card-item {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .card-item:hover {
            transform: translateY(-6px);
            border-color: rgba(240, 180, 41, 0.2);
            box-shadow: var(--shadow-md), var(--shadow-glow);
            background: var(--bg-card-hover);
        }
        .card-item .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
            display: block;
        }
        .card-item .card-body {
            padding: 22px 20px 24px;
        }
        .card-item .card-body .tag {
            margin-bottom: 10px;
        }
        .card-item .card-body h3 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }
        .card-item .card-body p {
            font-size: 0.92rem;
            color: var(--text-muted);
            margin-bottom: 0;
            line-height: 1.6;
        }
        .card-item .card-footer {
            padding: 0 20px 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .card-item .card-footer .btn {
            font-size: 0.85rem;
        }

        /* ===== 热门观测专题 文章列表 ===== */
        .featured-section {
            background: var(--primary-dark);
        }
        .article-list {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
        }
        .article-card {
            display: flex;
            gap: 20px;
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 16px;
            border: 1px solid var(--border-color);
            transition: all var(--transition);
            align-items: flex-start;
        }
        .article-card:hover {
            border-color: rgba(240, 180, 41, 0.2);
            background: var(--bg-card-hover);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }
        .article-card .art-img {
            width: 110px;
            min-width: 110px;
            height: 88px;
            object-fit: cover;
            border-radius: var(--radius-sm);
            flex-shrink: 0;
        }
        .article-card .art-body {
            flex: 1;
            min-width: 0;
        }
        .article-card .art-body .art-tag {
            font-size: 0.72rem;
            font-weight: 600;
            color: var(--accent-teal);
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-bottom: 4px;
            display: block;
        }
        .article-card .art-body h4 {
            font-size: 0.98rem;
            font-weight: 600;
            margin-bottom: 4px;
            line-height: 1.4;
        }
        .article-card .art-body h4 a {
            color: var(--text-primary);
        }
        .article-card .art-body h4 a:hover {
            color: var(--accent-gold);
        }
        .article-card .art-body p {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 0;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .article-card .art-body .art-meta {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 0.78rem;
            color: var(--text-muted);
            margin-top: 6px;
        }
        .article-card .art-body .art-meta i {
            width: 14px;
            color: var(--accent-gold);
        }
        @media (max-width: 820px) {
            .article-list {
                grid-template-columns: 1fr;
            }
            .article-card {
                flex-direction: column;
            }
            .article-card .art-img {
                width: 100%;
                min-width: unset;
                height: 140px;
            }
        }

        /* ===== 天文数据 ===== */
        .data-section {
            background: var(--primary-light);
        }
        .data-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }
        .data-card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px 20px;
            text-align: center;
            transition: all var(--transition);
        }
        .data-card:hover {
            border-color: rgba(240, 180, 41, 0.2);
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .data-card .data-icon {
            font-size: 2rem;
            color: var(--accent-gold);
            margin-bottom: 12px;
        }
        .data-card .data-number {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            line-height: 1.1;
        }
        .data-card .data-number span {
            color: var(--accent-gold);
        }
        .data-card .data-label {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin-top: 6px;
            font-weight: 500;
        }
        @media (max-width: 820px) {
            .data-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 16px;
            }
            .data-card .data-number {
                font-size: 1.7rem;
            }
        }
        @media (max-width: 480px) {
            .data-grid {
                grid-template-columns: 1fr 1fr;
                gap: 12px;
            }
        }

        /* ===== FAQ ===== */
        .faq-section {
            background: var(--bg-body);
        }
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            transition: border-color var(--transition);
        }
        .faq-item:hover {
            border-color: rgba(240, 180, 41, 0.15);
        }
        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            padding: 18px 22px;
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-primary);
            background: transparent;
            text-align: left;
            gap: 16px;
            transition: background var(--transition);
        }
        .faq-question:hover {
            background: rgba(255, 255, 255, 0.02);
        }
        .faq-question i {
            font-size: 1.1rem;
            color: var(--accent-gold);
            transition: transform 0.3s ease;
            flex-shrink: 0;
        }
        .faq-item.is-open .faq-question i {
            transform: rotate(180deg);
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 22px;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }
        .faq-item.is-open .faq-answer {
            max-height: 260px;
            padding: 0 22px 20px;
        }
        @media (max-width: 768px) {
            .faq-question {
                padding: 14px 16px;
                font-size: 0.92rem;
            }
            .faq-answer {
                padding: 0 16px;
                font-size: 0.88rem;
            }
            .faq-item.is-open .faq-answer {
                padding: 0 16px 16px;
            }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: var(--primary-dark);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center 30% / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta-section .container {
            position: relative;
            z-index: 1;
            text-align: center;
        }
        .cta-section h2 {
            margin-bottom: 16px;
        }
        .cta-section p {
            max-width: 560px;
            margin: 0 auto 32px;
            font-size: 1.05rem;
        }
        .cta-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            justify-content: center;
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary-dark);
            border-top: 1px solid var(--border-color);
            padding: 60px 0 30px;
        }
        .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, 0.06);
        }
        .footer-brand .logo {
            font-size: 1.4rem;
            margin-bottom: 12px;
            display: inline-flex;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--text-muted);
            max-width: 320px;
            line-height: 1.7;
        }
        .footer h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .footer ul li {
            margin-bottom: 8px;
        }
        .footer ul li a {
            font-size: 0.88rem;
            color: var(--text-muted);
            transition: color var(--transition);
        }
        .footer ul li a:hover {
            color: var(--accent-gold);
        }
        .footer-bottom {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            padding-top: 24px;
            font-size: 0.82rem;
            color: var(--text-muted);
            gap: 12px;
        }
        .footer-bottom span:last-child {
            color: var(--text-muted);
            font-style: italic;
        }
        @media (max-width: 820px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .footer-brand p {
                max-width: 100%;
            }
        }
        @media (max-width: 480px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
        }

        /* ===== Breadcrumb ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            padding: 20px 0 0;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-muted);
        }
        .breadcrumb a:hover {
            color: var(--accent-gold);
        }
        .breadcrumb span {
            color: var(--text-secondary);
        }
        .breadcrumb i {
            font-size: 0.6rem;
            color: var(--text-muted);
        }

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

        /* ===== 响应式微调 ===== */
        @media (max-width: 520px) {
            .hero-actions {
                flex-direction: column;
                align-items: center;
            }
            .hero-actions .btn {
                width: 100%;
                max-width: 280px;
            }
            .cards-grid {
                grid-template-columns: 1fr;
            }
            .data-card {
                padding: 20px 14px;
            }
            .cta-actions {
                flex-direction: column;
                align-items: center;
            }
            .cta-actions .btn {
                width: 100%;
                max-width: 280px;
            }
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a2a3a;
            --primary-light: #2c4058;
            --primary-dark: #0f1a26;
            --accent: #d4a84b;
            --accent-light: #e8c76a;
            --accent-dark: #b8923a;
            --bg: #f5f3ef;
            --bg-card: #ffffff;
            --bg-alt: #ebe8e2;
            --text: #1e1e1e;
            --text-light: #5a5a5a;
            --text-muted: #8a8a8a;
            --border: #ddd8d0;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 12px 48px rgba(0, 0, 0, 0.10);
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            --max-w: 1200px;
            --header-h: 72px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-font-smoothing: antialiased;
        }

        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.65;
            color: var(--text);
            background: var(--bg);
            padding-top: var(--header-h);
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }

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

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

        ul,
        ol {
            list-style: none;
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--max-w);
            margin: 0 auto;
            padding: 0 24px;
        }

        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Utility ===== */
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 12px;
            letter-spacing: -0.02em;
        }

        .section-sub {
            font-size: 1.05rem;
            color: var(--text-light);
            margin-bottom: 40px;
            max-width: 680px;
        }

        .text-center {
            text-align: center;
        }

        .mx-auto {
            margin-left: auto;
            margin-right: auto;
        }

        .mt-8 {
            margin-top: 32px;
        }

        .mb-8 {
            margin-bottom: 32px;
        }

        .gap-6 {
            gap: 24px;
        }

        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* ===== Header / Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-h);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border);
            z-index: 1000;
            transition: box-shadow var(--transition);
        }

        .header.scrolled {
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06);
        }

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

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 700;
            color: var(--primary);
            letter-spacing: -0.02em;
        }

        .logo i {
            color: var(--accent);
            font-size: 1.5rem;
        }

        .logo span {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-light);
            transition: all var(--transition);
            position: relative;
        }

        .nav a:hover {
            color: var(--primary);
            background: rgba(26, 42, 58, 0.06);
        }

        .nav a.active {
            color: var(--primary);
            background: rgba(26, 42, 58, 0.08);
            font-weight: 600;
        }

        .nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent);
            border-radius: 4px;
        }

        .nav .nav-cta {
            padding: 0;
            margin-left: 8px;
        }

        .nav .btn-gold {
            background: linear-gradient(135deg, var(--accent), var(--accent-light));
            color: var(--primary-dark) !important;
            padding: 8px 20px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.88rem;
            box-shadow: 0 2px 12px rgba(212, 168, 75, 0.30);
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .nav .btn-gold:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 24px rgba(212, 168, 75, 0.40);
            background: linear-gradient(135deg, var(--accent-light), var(--accent));
        }

        .nav .btn-gold i {
            font-size: 0.85rem;
        }

        /* Hamburger */
        .hamburger {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            padding: 6px;
            border-radius: 6px;
            transition: background var(--transition);
        }

        .hamburger:hover {
            background: rgba(26, 42, 58, 0.06);
        }

        .hamburger span {
            width: 26px;
            height: 2.5px;
            background: var(--primary);
            border-radius: 4px;
            transition: all var(--transition);
        }

        .hamburger.active span:nth-child(1) {
            transform: rotate(45deg) translate(5px, 5px);
        }
        .hamburger.active span:nth-child(2) {
            opacity: 0;
        }
        .hamburger.active span:nth-child(3) {
            transform: rotate(-45deg) translate(5px, -5px);
        }

        /* Mobile nav */
        .mobile-nav {
            display: none;
            position: fixed;
            top: var(--header-h);
            left: 0;
            right: 0;
            background: rgba(255, 255, 255, 0.98);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border);
            padding: 16px 24px 24px;
            flex-direction: column;
            gap: 6px;
            z-index: 999;
            transform: translateY(-8px);
            opacity: 0;
            transition: all 0.3s ease;
            pointer-events: none;
        }

        .mobile-nav.open {
            transform: translateY(0);
            opacity: 1;
            pointer-events: auto;
        }

        .mobile-nav a {
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-weight: 500;
            color: var(--text-light);
            transition: all var(--transition);
        }

        .mobile-nav a:hover {
            background: rgba(26, 42, 58, 0.06);
            color: var(--primary);
        }

        .mobile-nav a.active {
            color: var(--primary);
            background: rgba(26, 42, 58, 0.08);
            font-weight: 600;
        }

        .mobile-nav .btn-gold {
            margin-top: 8px;
            justify-content: center;
        }

        @media (max-width: 768px) {
            .nav {
                display: none !important;
            }
            .hamburger {
                display: flex;
            }
            .mobile-nav {
                display: flex;
            }
        }

        /* ===== Article Banner ===== */
        .article-banner {
            position: relative;
            background: var(--primary-dark);
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            background-blend-mode: overlay;
            padding: 64px 0 56px;
            color: #fff;
            overflow: hidden;
        }

        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 26, 38, 0.88) 0%, rgba(26, 42, 58, 0.72) 100%);
            z-index: 1;
        }

        .article-banner .container {
            position: relative;
            z-index: 2;
        }

        .article-banner .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.65);
            margin-bottom: 24px;
            flex-wrap: wrap;
        }

        .article-banner .breadcrumb a {
            color: rgba(255, 255, 255, 0.75);
            transition: color var(--transition);
        }

        .article-banner .breadcrumb a:hover {
            color: var(--accent-light);
        }

        .article-banner .breadcrumb i {
            font-size: 0.65rem;
            color: rgba(255, 255, 255, 0.4);
        }

        .article-banner .meta {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 16px;
        }

        .article-banner .meta .tag {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            background: rgba(212, 168, 75, 0.20);
            color: var(--accent-light);
            font-size: 0.80rem;
            font-weight: 600;
            letter-spacing: 0.02em;
            border: 1px solid rgba(212, 168, 75, 0.25);
        }

        .article-banner .meta .date {
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.6);
            display: flex;
            align-items: center;
            gap: 6px;
        }

        .article-banner .meta .date i {
            font-size: 0.75rem;
        }

        .article-banner h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.25;
            letter-spacing: -0.02em;
            color: #fff;
            max-width: 800px;
        }

        @media (max-width: 768px) {
            .article-banner {
                padding: 40px 0 36px;
            }
            .article-banner h1 {
                font-size: 1.7rem;
            }
        }

        /* ===== Article Content ===== */
        .article-section {
            padding: 56px 0 64px;
        }

        .article-layout {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 48px;
        }

        .article-body {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 40px;
            box-shadow: var(--shadow);
        }

        .article-body .content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text);
        }

        .article-body .content p {
            margin-bottom: 1.4em;
        }

        .article-body .content h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--primary);
            margin-top: 1.8em;
            margin-bottom: 0.6em;
            letter-spacing: -0.01em;
        }

        .article-body .content h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--primary-light);
            margin-top: 1.4em;
            margin-bottom: 0.5em;
        }

        .article-body .content ul,
        .article-body .content ol {
            margin-bottom: 1.4em;
            padding-left: 1.6em;
        }

        .article-body .content li {
            margin-bottom: 0.4em;
            list-style: disc;
        }

        .article-body .content img {
            border-radius: var(--radius-sm);
            margin: 1.6em 0;
            box-shadow: var(--shadow-sm);
        }

        .article-body .content blockquote {
            border-left: 4px solid var(--accent);
            padding: 12px 20px;
            margin: 1.4em 0;
            background: rgba(212, 168, 75, 0.06);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light);
            font-style: italic;
        }

        .article-body .content a {
            color: var(--accent-dark);
            text-decoration: underline;
            text-underline-offset: 2px;
        }

        .article-body .content a:hover {
            color: var(--accent);
        }

        .article-body .content .highlight {
            background: rgba(212, 168, 75, 0.10);
            padding: 0 4px;
            border-radius: 4px;
        }

        .not-found {
            text-align: center;
            padding: 80px 20px;
            background: var(--bg-card);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }

        .not-found i {
            font-size: 3.5rem;
            color: var(--text-muted);
            margin-bottom: 20px;
            opacity: 0.5;
        }

        .not-found h2 {
            font-size: 1.6rem;
            color: var(--primary);
            margin-bottom: 12px;
        }

        .not-found p {
            color: var(--text-light);
            margin-bottom: 24px;
        }

        .not-found .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 32px;
            background: var(--primary);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            transition: all var(--transition);
        }

        .not-found .btn:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(26, 42, 58, 0.20);
        }

        /* ===== Sidebar ===== */
        .article-sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }

        .sidebar-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px;
            box-shadow: var(--shadow);
        }

        .sidebar-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 16px;
            padding-bottom: 10px;
            border-bottom: 2px solid var(--border);
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .sidebar-card h3 i {
            color: var(--accent);
            font-size: 1rem;
        }

        .sidebar-list {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .sidebar-list a {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 10px 12px;
            border-radius: var(--radius-sm);
            background: var(--bg);
            transition: all var(--transition);
            font-size: 0.92rem;
            color: var(--text);
        }

        .sidebar-list a:hover {
            background: rgba(212, 168, 75, 0.10);
            transform: translateX(4px);
        }

        .sidebar-list a .num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            font-size: 0.75rem;
            font-weight: 700;
            flex-shrink: 0;
        }

        .sidebar-list a .num.gold {
            background: var(--accent);
            color: var(--primary-dark);
        }

        .sidebar-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }

        .sidebar-tags a {
            display: inline-block;
            padding: 5px 14px;
            border-radius: 20px;
            background: var(--bg);
            border: 1px solid var(--border);
            font-size: 0.82rem;
            color: var(--text-light);
            transition: all var(--transition);
        }

        .sidebar-tags a:hover {
            background: var(--accent);
            border-color: var(--accent);
            color: var(--primary-dark);
            transform: translateY(-1px);
        }

        .sidebar-cta {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: var(--radius);
            padding: 32px 28px;
            text-align: center;
            color: #fff;
        }

        .sidebar-cta h4 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .sidebar-cta p {
            font-size: 0.92rem;
            color: rgba(255, 255, 255, 0.75);
            margin-bottom: 20px;
        }

        .sidebar-cta .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            background: var(--accent);
            color: var(--primary-dark);
            border-radius: var(--radius-sm);
            font-weight: 700;
            font-size: 0.92rem;
            transition: all var(--transition);
        }

        .sidebar-cta .btn:hover {
            background: var(--accent-light);
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(212, 168, 75, 0.30);
        }

        @media (max-width: 1024px) {
            .article-layout {
                grid-template-columns: 1fr;
                gap: 32px;
            }
            .article-sidebar {
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
        }

        @media (max-width: 640px) {
            .article-body {
                padding: 24px 18px;
            }
            .article-sidebar {
                grid-template-columns: 1fr;
            }
            .article-body .content {
                font-size: 0.98rem;
            }
        }

        /* ===== Related Section ===== */
        .related-section {
            padding: 48px 0 64px;
            background: var(--bg-alt);
        }

        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: all var(--transition);
        }

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

        .related-card img {
            width: 100%;
            height: 180px;
            object-fit: cover;
        }

        .related-card .body {
            padding: 20px 22px 24px;
        }

        .related-card .body .tag {
            display: inline-block;
            padding: 2px 12px;
            border-radius: 12px;
            background: rgba(212, 168, 75, 0.12);
            color: var(--accent-dark);
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 8px;
        }

        .related-card .body h4 {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
            line-height: 1.4;
        }

        .related-card .body p {
            font-size: 0.88rem;
            color: var(--text-light);
            line-height: 1.6;
        }

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

        @media (max-width: 520px) {
            .related-grid {
                grid-template-columns: 1fr;
            }
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.80);
            padding: 56px 0 0;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 48px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .footer-brand .logo {
            color: #fff;
            margin-bottom: 16px;
            font-size: 1.3rem;
        }

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

        .footer-brand .logo span {
            background: none;
            -webkit-text-fill-color: #fff;
            background-clip: unset;
        }

        .footer-brand p {
            font-size: 0.90rem;
            line-height: 1.7;
            color: rgba(255, 255, 255, 0.6);
            max-width: 320px;
        }

        .footer h4 {
            color: #fff;
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 18px;
            letter-spacing: 0.02em;
        }

        .footer ul {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer ul a {
            font-size: 0.88rem;
            color: rgba(255, 255, 255, 0.55);
            transition: all var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .footer ul a:hover {
            color: var(--accent-light);
            transform: translateX(4px);
        }

        .footer ul a::before {
            content: '›';
            font-size: 1.1rem;
            color: var(--accent);
            opacity: 0.6;
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 24px 0;
            font-size: 0.82rem;
            color: rgba(255, 255, 255, 0.4);
            flex-wrap: wrap;
            gap: 12px;
        }

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

        @media (max-width: 520px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
        }

        /* ===== Responsive extras ===== */
        @media (max-width: 520px) {
            .section-title {
                font-size: 1.5rem;
            }
            .article-banner h1 {
                font-size: 1.4rem;
            }
        }

        /* ===== Back to top ===== */
        .back-top {
            position: fixed;
            bottom: 32px;
            right: 32px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: 0 4px 20px rgba(26, 42, 58, 0.25);
            transition: all var(--transition);
            opacity: 0;
            pointer-events: none;
            z-index: 500;
        }

        .back-top.visible {
            opacity: 1;
            pointer-events: auto;
        }

        .back-top:hover {
            background: var(--accent);
            color: var(--primary-dark);
            transform: translateY(-4px);
            box-shadow: 0 8px 32px rgba(212, 168, 75, 0.30);
        }

        @media (max-width: 520px) {
            .back-top {
                bottom: 20px;
                right: 20px;
                width: 42px;
                height: 42px;
                font-size: 1rem;
            }
        }