/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a2a4a;
            --primary-light: #2c4a7a;
            --primary-dark: #0f1a30;
            --accent: #d4a84b;
            --accent-light: #e8c77a;
            --accent-dark: #b88d2e;
            --bg-body: #f8f7f4;
            --bg-card: #ffffff;
            --bg-section-alt: #f0ede8;
            --bg-dark: #1a2a4a;
            --text-primary: #1e1e1e;
            --text-body: #3d3d3d;
            --text-weak: #8a8a8a;
            --text-light: #f5f3ee;
            --text-on-dark: #e8e4de;
            --border-color: #e2ddd6;
            --border-light: #f0ece6;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 32px;
            --shadow-sm: 0 2px 8px rgba(26, 42, 74, 0.06);
            --shadow-md: 0 8px 30px rgba(26, 42, 74, 0.08);
            --shadow-lg: 0 20px 60px rgba(26, 42, 74, 0.12);
            --shadow-accent: 0 8px 30px rgba(212, 168, 75, 0.25);
            --space-xs: 4px;
            --space-sm: 8px;
            --space-md: 16px;
            --space-lg: 32px;
            --space-xl: 48px;
            --space-2xl: 80px;
            --max-width: 1200px;
            --header-h: 72px;
            --footer-py: 56px;
            --transition: all 0.3s 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; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background: var(--bg-body);
            padding-top: var(--header-h);
        }
        a { color: var(--primary-light); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--accent); }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { color: var(--text-primary); font-weight: 700; line-height: 1.3; }
        h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
        h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
        h3 { font-size: clamp(1.2rem, 2.5vw, 1.6rem); }
        p { margin-bottom: 1rem; }
        .container { width: 100%; max-width: var(--max-width); margin: 0 auto; padding: 0 var(--space-lg); }
        .section { padding: var(--space-2xl) 0; }
        .section-title { text-align: center; margin-bottom: var(--space-xl); }
        .section-title h2 { margin-bottom: var(--space-sm); }
        .section-title p { color: var(--text-weak); max-width: 600px; margin: 0 auto; font-size: 1.05rem; }

        /* ===== Header & Nav (Desktop) ===== */
        .header {
            position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
            height: var(--header-h);
            background: rgba(26, 42, 74, 0.96);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            transition: var(--transition);
        }
        .header .container {
            display: flex; align-items: center; justify-content: space-between;
            height: 100%;
        }
        .header-logo {
            display: flex; align-items: center; gap: var(--space-sm);
            font-size: 1.5rem; font-weight: 800; color: #fff;
            letter-spacing: 0.5px;
        }
        .header-logo i { color: var(--accent); font-size: 1.8rem; }
        .header-logo span { background: linear-gradient(135deg, #fff 60%, var(--accent-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .header-nav { display: flex; align-items: center; gap: var(--space-lg); }
        .header-nav a {
            color: var(--text-on-dark); font-size: 0.95rem; font-weight: 500;
            padding: var(--space-xs) 0; position: relative; letter-spacing: 0.3px;
        }
        .header-nav a::after {
            content: ''; position: absolute; bottom: -4px; left: 0; right: 0;
            height: 2px; background: var(--accent); border-radius: 2px;
            transform: scaleX(0); transform-origin: right center;
            transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
        }
        .header-nav a:hover { color: var(--accent-light); }
        .header-nav a:hover::after { transform: scaleX(1); transform-origin: left center; }
        .header-nav a.active { color: var(--accent); }
        .header-nav a.active::after { transform: scaleX(1); background: var(--accent); }
        .header-cta {
            display: inline-flex; align-items: center; gap: var(--space-sm);
            background: var(--accent); color: var(--primary-dark) !important;
            padding: 8px 22px; border-radius: 50px; font-weight: 600;
            font-size: 0.9rem; transition: var(--transition);
        }
        .header-cta i { font-size: 0.85rem; }
        .header-cta:hover { background: var(--accent-light); transform: translateY(-1px); box-shadow: var(--shadow-accent); }
        .header-cta::after { display: none !important; }

        /* Mobile menu toggle */
        .menu-toggle { display: none; background: none; border: none; color: #fff; font-size: 1.6rem; cursor: pointer; padding: var(--space-sm); }

        /* ===== Mobile Bottom Tab Nav ===== */
        .bottom-tab {
            display: none; /* hidden on desktop */
            position: fixed; bottom: 0; left: 0; right: 0; z-index: 999;
            background: rgba(26, 42, 74, 0.98);
            backdrop-filter: blur(12px);
            border-top: 1px solid rgba(255,255,255,0.06);
            padding: var(--space-sm) 0 env(safe-area-inset-bottom, 8px);
            justify-content: space-around;
            align-items: center;
        }
        .bottom-tab a {
            display: flex; flex-direction: column; align-items: center; gap: 2px;
            color: var(--text-weak); font-size: 0.7rem; font-weight: 500;
            padding: var(--space-xs) var(--space-md); transition: var(--transition);
            min-width: 60px;
        }
        .bottom-tab a i { font-size: 1.3rem; transition: var(--transition); }
        .bottom-tab a span { line-height: 1.2; }
        .bottom-tab a:hover, .bottom-tab a.active { color: var(--accent); }
        .bottom-tab a.active i { color: var(--accent); transform: translateY(-2px); }
        .bottom-tab .tab-cta {
            background: var(--accent); color: var(--primary-dark) !important;
            border-radius: 50px; padding: 6px 18px; margin-top: -4px;
        }
        .bottom-tab .tab-cta i { color: var(--primary-dark); }
        .bottom-tab .tab-cta span { color: var(--primary-dark); font-weight: 600; }

        /* ===== Hero ===== */
        .hero {
            position: relative; min-height: 70vh;
            display: flex; align-items: center;
            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: 0.55;
            transform: scale(1.02);
            transition: transform 8s ease;
        }
        .hero:hover .hero-bg { transform: scale(1.06); }
        .hero-overlay {
            position: absolute; inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(26,42,74,0.5) 0%, rgba(15,26,48,0.85) 70%);
        }
        .hero .container { position: relative; z-index: 2; padding-top: var(--space-xl); padding-bottom: var(--space-xl); }
        .hero-content { max-width: 700px; }
        .hero-badge {
            display: inline-flex; align-items: center; gap: var(--space-sm);
            background: rgba(212, 168, 75, 0.18);
            border: 1px solid rgba(212, 168, 75, 0.3);
            color: var(--accent-light); font-size: 0.85rem; font-weight: 600;
            padding: 6px 18px; border-radius: 50px; margin-bottom: var(--space-lg);
            backdrop-filter: blur(4px);
        }
        .hero-badge i { font-size: 0.75rem; }
        .hero-content h1 {
            color: #fff; font-size: clamp(2.2rem, 5.5vw, 3.6rem);
            line-height: 1.15; margin-bottom: var(--space-md);
            text-shadow: 0 2px 20px rgba(0,0,0,0.3);
        }
        .hero-content h1 span { color: var(--accent); }
        .hero-content p {
            color: var(--text-on-dark); font-size: 1.15rem; max-width: 560px;
            margin-bottom: var(--space-lg); opacity: 0.9;
            text-shadow: 0 1px 10px rgba(0,0,0,0.3);
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-md); align-items: center; }
        .hero-actions .btn-primary {
            background: var(--accent); color: var(--primary-dark); font-weight: 700;
            padding: 14px 36px; border-radius: 50px; font-size: 1rem;
            display: inline-flex; align-items: center; gap: var(--space-sm);
            transition: var(--transition); border: none; cursor: pointer;
        }
        .hero-actions .btn-primary:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: var(--shadow-accent); }
        .hero-actions .btn-secondary {
            background: rgba(255,255,255,0.08); color: #fff; font-weight: 500;
            padding: 14px 30px; border-radius: 50px; font-size: 1rem;
            display: inline-flex; align-items: center; gap: var(--space-sm);
            border: 1px solid rgba(255,255,255,0.15); backdrop-filter: blur(4px);
            transition: var(--transition);
        }
        .hero-actions .btn-secondary:hover { background: rgba(255,255,255,0.15); border-color: var(--accent); }
        .hero-stats {
            display: flex; flex-wrap: wrap; gap: var(--space-xl); margin-top: var(--space-xl);
            padding-top: var(--space-lg); border-top: 1px solid rgba(255,255,255,0.08);
        }
        .hero-stat { text-align: left; }
        .hero-stat .num { color: #fff; font-size: 1.8rem; font-weight: 800; letter-spacing: -0.5px; }
        .hero-stat .num span { color: var(--accent); }
        .hero-stat .label { color: var(--text-weak); font-size: 0.85rem; margin-top: 2px; }

        /* ===== Buttons ===== */
        .btn { display: inline-flex; align-items: center; gap: var(--space-sm); font-weight: 600; border: none; cursor: pointer; transition: var(--transition); border-radius: 50px; padding: 12px 28px; font-size: 0.95rem; }
        .btn-primary { background: var(--accent); color: var(--primary-dark); }
        .btn-primary:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: var(--shadow-accent); }
        .btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
        .btn-outline:hover { background: var(--primary); color: #fff; }
        .btn-sm { padding: 8px 20px; font-size: 0.85rem; }
        .btn-lg { padding: 16px 40px; font-size: 1.05rem; }

        /* ===== Intro Section ===== */
        .intro-section { background: var(--bg-card); }
        .intro-grid {
            display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-2xl);
            align-items: center;
        }
        .intro-image {
            border-radius: var(--radius-lg); overflow: hidden;
            box-shadow: var(--shadow-lg); position: relative;
        }
        .intro-image img { width: 100%; height: 420px; object-fit: cover; transition: transform 0.6s ease; }
        .intro-image:hover img { transform: scale(1.03); }
        .intro-image::after {
            content: ''; position: absolute; inset: 0;
            background: linear-gradient(to top, rgba(26,42,74,0.2) 0%, transparent 60%);
        }
        .intro-text h2 { margin-bottom: var(--space-md); }
        .intro-text p { color: var(--text-body); font-size: 1.05rem; margin-bottom: var(--space-md); }
        .intro-tags { display: flex; flex-wrap: wrap; gap: var(--space-sm); margin-top: var(--space-lg); }
        .intro-tags .tag {
            background: var(--bg-section-alt); color: var(--primary);
            padding: 6px 16px; border-radius: 50px; font-size: 0.85rem; font-weight: 500;
            display: inline-flex; align-items: center; gap: 6px;
        }
        .intro-tags .tag i { color: var(--accent); font-size: 0.75rem; }

        /* ===== Category Cards ===== */
        .category-section { background: var(--bg-section-alt); }
        .category-grid {
            display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: var(--space-lg);
        }
        .category-card {
            background: var(--bg-card); border-radius: var(--radius-md);
            overflow: hidden; box-shadow: var(--shadow-sm);
            transition: var(--transition); cursor: pointer;
            border: 1px solid var(--border-light);
        }
        .category-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
        .category-card-img {
            height: 200px; overflow: hidden; position: relative;
        }
        .category-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
        .category-card:hover .category-card-img img { transform: scale(1.06); }
        .category-card-img .card-overlay {
            position: absolute; inset: 0;
            background: linear-gradient(to top, rgba(26,42,74,0.5) 0%, transparent 50%);
        }
        .category-card-body { padding: var(--space-lg); }
        .category-card-body h3 { font-size: 1.2rem; margin-bottom: var(--space-sm); }
        .category-card-body p { color: var(--text-weak); font-size: 0.9rem; margin-bottom: var(--space-md); }
        .category-card-body .card-link {
            font-weight: 600; color: var(--accent-dark); font-size: 0.9rem;
            display: inline-flex; align-items: center; gap: 6px;
        }
        .category-card-body .card-link i { transition: transform 0.3s ease; }
        .category-card-body .card-link:hover i { transform: translateX(4px); }

        /* ===== Features / Stats ===== */
        .features-section { background: var(--bg-card); }
        .features-grid {
            display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: var(--space-lg); margin-top: var(--space-lg);
        }
        .feature-item {
            text-align: center; padding: var(--space-lg) var(--space-md);
            border-radius: var(--radius-md); transition: var(--transition);
            border: 1px solid var(--border-light);
        }
        .feature-item:hover { background: var(--bg-section-alt); border-color: var(--accent); transform: translateY(-4px); }
        .feature-item .icon {
            width: 64px; height: 64px; margin: 0 auto var(--space-md);
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center;
            color: #fff; font-size: 1.6rem; transition: var(--transition);
        }
        .feature-item:hover .icon { background: var(--accent); transform: scale(1.05); }
        .feature-item h3 { font-size: 1.1rem; margin-bottom: var(--space-sm); }
        .feature-item p { color: var(--text-weak); font-size: 0.9rem; margin-bottom: 0; }

        /* ===== News / CMS List ===== */
        .news-section { background: var(--bg-section-alt); }
        .news-list {
            display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
            gap: var(--space-lg);
        }
        .news-card {
            background: var(--bg-card); border-radius: var(--radius-md);
            overflow: hidden; box-shadow: var(--shadow-sm);
            transition: var(--transition); border: 1px solid var(--border-light);
        }
        .news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
        .news-card-img {
            height: 180px; overflow: hidden; position: relative;
        }
        .news-card-img img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.5s ease; }
        .news-card:hover .news-card-img img { transform: scale(1.04); }
        .news-card-img .news-cat {
            position: absolute; top: var(--space-md); left: var(--space-md);
            background: var(--accent); color: var(--primary-dark);
            font-size: 0.75rem; font-weight: 700; padding: 4px 14px; border-radius: 50px;
            z-index: 2;
        }
        .news-card-body { padding: var(--space-lg); }
        .news-card-body .news-meta {
            display: flex; align-items: center; gap: var(--space-md);
            color: var(--text-weak); font-size: 0.8rem; margin-bottom: var(--space-sm);
        }
        .news-card-body .news-meta i { margin-right: 4px; }
        .news-card-body h3 { font-size: 1.1rem; margin-bottom: var(--space-sm); }
        .news-card-body h3 a { color: var(--text-primary); }
        .news-card-body h3 a:hover { color: var(--accent); }
        .news-card-body p { color: var(--text-weak); font-size: 0.9rem; margin-bottom: var(--space-md); }
        .news-card-body .read-more {
            font-weight: 600; color: var(--primary-light); font-size: 0.85rem;
            display: inline-flex; align-items: center; gap: 6px;
        }
        .news-card-body .read-more i { transition: transform 0.3s ease; }
        .news-card-body .read-more:hover i { transform: translateX(4px); }
        .news-empty {
            grid-column: 1 / -1; text-align: center; padding: var(--space-2xl) var(--space-lg);
            color: var(--text-weak); font-size: 1.05rem;
            background: var(--bg-card); border-radius: var(--radius-md);
            border: 1px dashed var(--border-color);
        }

        /* ===== FAQ ===== */
        .faq-section { background: var(--bg-card); }
        .faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: var(--space-md); }
        .faq-item {
            background: var(--bg-section-alt); border-radius: var(--radius-md);
            padding: var(--space-lg); transition: var(--transition);
            border: 1px solid var(--border-light);
        }
        .faq-item:hover { border-color: var(--accent); box-shadow: var(--shadow-sm); }
        .faq-item .q {
            font-weight: 700; color: var(--text-primary); font-size: 1.05rem;
            display: flex; align-items: center; gap: var(--space-sm);
            margin-bottom: var(--space-sm);
        }
        .faq-item .q i { color: var(--accent); font-size: 1.1rem; }
        .faq-item .a {
            color: var(--text-body); font-size: 0.95rem; padding-left: calc(1.1rem + var(--space-sm));
            line-height: 1.7;
        }

        /* ===== 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 center / cover no-repeat;
            opacity: 0.12;
        }
        .cta-section .container { position: relative; z-index: 2; text-align: center; padding: var(--space-2xl) var(--space-lg); }
        .cta-section h2 { color: #fff; margin-bottom: var(--space-md); }
        .cta-section p { color: var(--text-on-dark); max-width: 600px; margin: 0 auto var(--space-lg); opacity: 0.85; }
        .cta-section .btn-cta {
            background: var(--accent); color: var(--primary-dark); font-weight: 700;
            padding: 16px 48px; border-radius: 50px; font-size: 1.1rem;
            display: inline-flex; align-items: center; gap: var(--space-sm);
            transition: var(--transition); border: none; cursor: pointer;
        }
        .cta-section .btn-cta:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: var(--shadow-accent); }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary); color: var(--text-on-dark);
            padding: var(--space-2xl) 0 var(--space-lg);
        }
        .footer-grid {
            display: grid; grid-template-columns: 2fr 1fr 1fr;
            gap: var(--space-xl); margin-bottom: var(--space-xl);
        }
        .footer-brand .footer-logo {
            font-size: 1.5rem; font-weight: 800; color: #fff;
            display: flex; align-items: center; gap: var(--space-sm); margin-bottom: var(--space-md);
        }
        .footer-brand .footer-logo i { color: var(--accent); }
        .footer-brand p { color: var(--text-weak); font-size: 0.9rem; max-width: 360px; }
        .footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: var(--space-md); font-weight: 600; }
        .footer-col a {
            display: block; color: var(--text-weak); font-size: 0.9rem;
            padding: 4px 0; transition: var(--transition);
        }
        .footer-col a:hover { color: var(--accent-light); padding-left: 4px; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: var(--space-lg); text-align: center;
            color: var(--text-weak); font-size: 0.85rem;
        }
        .footer-bottom a { color: var(--accent-light); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .intro-grid { grid-template-columns: 1fr; gap: var(--space-xl); }
            .intro-image img { height: 320px; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 768px) {
            :root { --header-h: 64px; --footer-py: 40px; }
            .header-nav { display: none; }
            .menu-toggle { display: block; }
            .bottom-tab { display: flex; }
            body { padding-bottom: 72px; }

            .hero { min-height: 60vh; }
            .hero-content h1 { font-size: clamp(1.8rem, 6vw, 2.4rem); }
            .hero-content p { font-size: 1rem; }
            .hero-stats { gap: var(--space-lg); }
            .hero-stat .num { font-size: 1.4rem; }

            .section { padding: var(--space-xl) 0; }
            .category-grid { grid-template-columns: 1fr 1fr; }
            .news-list { grid-template-columns: 1fr; }
            .features-grid { grid-template-columns: 1fr 1fr; }

            .footer-grid { grid-template-columns: 1fr; gap: var(--space-lg); }
            .footer-brand p { max-width: 100%; }

            .cta-section .container { padding: var(--space-xl) var(--space-lg); }
            .cta-section h2 { font-size: 1.5rem; }
        }

        @media (max-width: 520px) {
            .container { padding: 0 var(--space-md); }
            .category-grid { grid-template-columns: 1fr; }
            .features-grid { grid-template-columns: 1fr; }
            .hero-stats { flex-direction: column; gap: var(--space-md); }
            .hero-actions { flex-direction: column; align-items: stretch; }
            .hero-actions .btn-primary, .hero-actions .btn-secondary { justify-content: center; }
            .intro-image img { height: 220px; }
            .news-card-img { height: 160px; }
            .bottom-tab a { min-width: 50px; padding: var(--space-xs) var(--space-sm); }
            .bottom-tab a i { font-size: 1.1rem; }
            .bottom-tab a span { font-size: 0.6rem; }
            .header-logo { font-size: 1.2rem; }
            .header-logo i { font-size: 1.4rem; }
            .faq-item { padding: var(--space-md); }
        }

        /* ===== Mobile nav dropdown (simple) ===== */
        .mobile-nav-dropdown {
            display: none; position: fixed; top: var(--header-h); left: 0; right: 0;
            background: rgba(26,42,74,0.98); backdrop-filter: blur(12px);
            padding: var(--space-lg); border-bottom: 1px solid rgba(255,255,255,0.06);
            z-index: 999;
        }
        .mobile-nav-dropdown.open { display: block; }
        .mobile-nav-dropdown a {
            display: block; color: var(--text-on-dark); font-size: 1.05rem;
            padding: var(--space-md) 0; border-bottom: 1px solid rgba(255,255,255,0.05);
            font-weight: 500;
        }
        .mobile-nav-dropdown a:last-child { border-bottom: none; }
        .mobile-nav-dropdown a.active { color: var(--accent); }
        .mobile-nav-dropdown .mobile-cta {
            background: var(--accent); color: var(--primary-dark) !important;
            text-align: center; border-radius: 50px; margin-top: var(--space-md);
            padding: var(--space-md); font-weight: 700; border-bottom: none;
        }

        /* ===== Utility ===== */
        .text-center { text-align: center; }
        .mt-lg { margin-top: var(--space-lg); }
        .mb-lg { margin-bottom: var(--space-lg); }
        .gap-md { gap: var(--space-md); }
        .flex-center { display: flex; align-items: center; justify-content: center; }

        /* Focus accessibility */
        a:focus-visible, button:focus-visible, input:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 3px;
            border-radius: 4px;
        }

        /* Smooth image loading */
        img { background: var(--bg-section-alt); }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a2a3a;
            --primary-light: #2c4055;
            --primary-dark: #0f1a26;
            --accent: #c9a84c;
            --accent-light: #dfc06a;
            --accent-dark: #a8892e;
            --bg-body: #f5f3ef;
            --bg-card: #ffffff;
            --bg-soft: #ebe8e1;
            --bg-dark: #1a2a3a;
            --text-dark: #1e1e1e;
            --text-body: #2d2d2d;
            --text-soft: #5a5a5a;
            --text-muted: #8a8a8a;
            --text-light: #f0ece4;
            --border: #ded9d0;
            --border-light: #efebe5;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(26, 42, 58, 0.06);
            --shadow: 0 6px 24px rgba(26, 42, 58, 0.08);
            --shadow-lg: 0 12px 40px rgba(26, 42, 58, 0.12);
            --shadow-accent: 0 4px 16px rgba(201, 168, 76, 0.25);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', system-ui, -apple-system, sans-serif;
            --container: 1200px;
            --header-h: 72px;
            --tab-h: 64px;
        }

        /* ===== 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-body);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-h);
            padding-bottom: var(--tab-h);
        }
        @media (min-width: 769px) {
            body {
                padding-bottom: 0;
            }
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover,
        a:focus-visible {
            color: var(--accent);
        }
        a:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
        }
        button,
        input,
        select,
        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 {
            color: var(--text-dark);
            line-height: 1.3;
            font-weight: 700;
        }

        /* ===== Container ===== */
        .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 20px;
        }
        @media (max-width: 768px) {
            .container {
                padding: 0 16px;
            }
        }

        /* ===== Header / Nav (桌面) ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-h);
            background: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-light);
            transition: var(--transition);
        }
        .header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 100%;
        }
        .header-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: 0.5px;
        }
        .header-logo i {
            color: var(--accent);
            font-size: 1.6rem;
        }
        .header-logo:hover {
            color: var(--primary);
        }
        .header-nav {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .header-nav a {
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-soft);
            transition: var(--transition);
            position: relative;
        }
        .header-nav a:hover {
            color: var(--primary);
            background: rgba(26, 42, 58, 0.05);
        }
        .header-nav a.active {
            color: var(--primary);
            background: rgba(201, 168, 76, 0.15);
            font-weight: 600;
        }
        .header-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 2px;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            background: var(--accent);
            border-radius: 2px;
        }
        .header-cta {
            background: var(--accent) !important;
            color: #fff !important;
            padding: 8px 22px !important;
            border-radius: var(--radius-sm) !important;
            font-weight: 600 !important;
            display: flex;
            align-items: center;
            gap: 8px;
            box-shadow: var(--shadow-accent);
        }
        .header-cta:hover {
            background: var(--accent-dark) !important;
            color: #fff !important;
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(201, 168, 76, 0.35) !important;
        }
        .header-cta i {
            font-size: 0.9rem;
        }

        /* ===== 移动端底部 Tab 导航 ===== */
        .bottom-tab {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--tab-h);
            background: rgba(255, 255, 255, 0.96);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border-top: 1px solid var(--border-light);
            box-shadow: 0 -2px 12px rgba(26, 42, 58, 0.06);
            justify-content: space-around;
            align-items: center;
            padding: 0 8px;
        }
        .bottom-tab a {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            font-size: 0.7rem;
            font-weight: 500;
            color: var(--text-muted);
            transition: var(--transition);
            min-width: 60px;
        }
        .bottom-tab a i {
            font-size: 1.3rem;
            line-height: 1;
        }
        .bottom-tab a:hover {
            color: var(--primary);
            background: rgba(26, 42, 58, 0.04);
        }
        .bottom-tab a.active {
            color: var(--accent-dark);
            font-weight: 600;
        }
        .bottom-tab a.active i {
            color: var(--accent);
        }
        .bottom-tab .tab-cta {
            background: var(--accent);
            color: #fff !important;
            border-radius: 40px;
            padding: 6px 18px;
            flex-direction: row;
            gap: 6px;
            font-size: 0.8rem;
            box-shadow: var(--shadow-accent);
        }
        .bottom-tab .tab-cta i {
            font-size: 1rem;
        }
        .bottom-tab .tab-cta:hover {
            background: var(--accent-dark) !important;
        }
        @media (max-width: 768px) {
            .bottom-tab {
                display: flex;
            }
        }

        /* ===== Hero / Banner ===== */
        .hero-banner {
            position: relative;
            min-height: 340px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: var(--primary-dark) url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            background-blend-mode: overlay;
            padding: 60px 20px;
            overflow: hidden;
        }
        .hero-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(26, 42, 58, 0.82) 0%, rgba(15, 26, 38, 0.70) 100%);
            z-index: 1;
        }
        .hero-banner .container {
            position: relative;
            z-index: 2;
        }
        .hero-banner h1 {
            font-size: 3rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 16px;
            letter-spacing: 1px;
            text-shadow: 0 2px 12px rgba(0, 0, 0, 0.2);
        }
        .hero-banner p {
            font-size: 1.2rem;
            color: rgba(255, 255, 255, 0.85);
            max-width: 640px;
            margin: 0 auto 28px;
            line-height: 1.6;
        }
        .hero-banner .hero-actions {
            display: flex;
            gap: 16px;
            justify-content: center;
            flex-wrap: wrap;
        }
        .hero-banner .hero-actions .btn-primary {
            padding: 14px 36px;
            font-size: 1.05rem;
        }
        .hero-banner .hero-actions .btn-outline {
            padding: 14px 36px;
            font-size: 1.05rem;
            border-color: rgba(255, 255, 255, 0.5);
            color: #fff;
        }
        .hero-banner .hero-actions .btn-outline:hover {
            border-color: #fff;
            background: rgba(255, 255, 255, 0.12);
        }
        @media (max-width: 768px) {
            .hero-banner {
                min-height: 260px;
                padding: 40px 16px;
            }
            .hero-banner h1 {
                font-size: 2rem;
            }
            .hero-banner p {
                font-size: 1rem;
            }
            .hero-banner .hero-actions .btn-primary,
            .hero-banner .hero-actions .btn-outline {
                padding: 12px 28px;
                font-size: 0.95rem;
            }
        }
        @media (max-width: 520px) {
            .hero-banner h1 {
                font-size: 1.7rem;
            }
        }

        /* ===== 波形装饰 ===== */
        .wave-divider {
            position: relative;
            height: 60px;
            background: var(--bg-body);
            overflow: hidden;
            margin-top: -2px;
        }
        .wave-divider svg {
            position: absolute;
            bottom: 0;
            width: 100%;
            height: 60px;
            fill: var(--bg-body);
        }

        /* ===== 通用板块 ===== */
        .section {
            padding: 80px 0;
        }
        .section-alt {
            background: var(--bg-soft);
        }
        .section-dark {
            background: var(--bg-dark);
            color: var(--text-light);
        }
        .section-dark h2,
        .section-dark h3,
        .section-dark h4 {
            color: #fff;
        }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: 0.5px;
        }
        .section-title p {
            font-size: 1.05rem;
            color: var(--text-soft);
            max-width: 580px;
            margin: 0 auto;
        }
        .section-title .title-accent {
            display: inline-block;
            width: 48px;
            height: 4px;
            background: var(--accent);
            border-radius: 4px;
            margin-top: 12px;
        }
        @media (max-width: 768px) {
            .section {
                padding: 50px 0;
            }
            .section-title h2 {
                font-size: 1.7rem;
            }
            .section-title p {
                font-size: 0.95rem;
            }
            .section-title {
                margin-bottom: 32px;
            }
        }

        /* ===== 标签云 ===== */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            justify-content: center;
            margin: 24px 0 8px;
        }
        .tag-cloud .tag {
            padding: 8px 22px;
            border-radius: 40px;
            font-size: 0.9rem;
            font-weight: 500;
            background: var(--bg-card);
            border: 1px solid var(--border);
            color: var(--text-soft);
            transition: var(--transition);
            cursor: default;
            box-shadow: var(--shadow-sm);
        }
        .tag-cloud .tag:hover {
            border-color: var(--accent);
            color: var(--accent-dark);
            background: rgba(201, 168, 76, 0.06);
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }
        .tag-cloud .tag.active {
            background: var(--accent);
            color: #fff;
            border-color: var(--accent);
            box-shadow: var(--shadow-accent);
        }
        @media (max-width: 520px) {
            .tag-cloud .tag {
                padding: 6px 16px;
                font-size: 0.8rem;
            }
        }

        /* ===== 卡片网格 ===== */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }
        @media (max-width: 1024px) {
            .card-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 20px;
            }
        }
        @media (max-width: 640px) {
            .card-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
        }

        /* ===== 攻略卡片 ===== */
        .guide-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            border: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
        }
        .guide-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
            border-color: transparent;
        }
        .guide-card .card-img {
            aspect-ratio: 16 / 10;
            overflow: hidden;
            position: relative;
            background: var(--bg-soft);
        }
        .guide-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .guide-card:hover .card-img img {
            transform: scale(1.04);
        }
        .guide-card .card-img .card-tag {
            position: absolute;
            top: 14px;
            left: 14px;
            padding: 4px 14px;
            border-radius: 40px;
            font-size: 0.75rem;
            font-weight: 600;
            background: rgba(26, 42, 58, 0.75);
            color: #fff;
            backdrop-filter: blur(4px);
            letter-spacing: 0.3px;
        }
        .guide-card .card-body {
            padding: 22px 24px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .guide-card .card-body h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
            line-height: 1.4;
            color: var(--text-dark);
        }
        .guide-card .card-body p {
            font-size: 0.92rem;
            color: var(--text-soft);
            line-height: 1.6;
            flex: 1;
            margin-bottom: 16px;
        }
        .guide-card .card-meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 0.82rem;
            color: var(--text-muted);
            border-top: 1px solid var(--border-light);
            padding-top: 14px;
            margin-top: auto;
        }
        .guide-card .card-meta i {
            margin-right: 4px;
            color: var(--accent);
        }
        .guide-card .card-meta span {
            display: flex;
            align-items: center;
        }
        @media (max-width: 768px) {
            .guide-card .card-body {
                padding: 18px 18px 20px;
            }
            .guide-card .card-body h3 {
                font-size: 1.05rem;
            }
        }

        /* ===== 排行列表 ===== */
        .rank-list {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .rank-item {
            display: flex;
            align-items: center;
            gap: 18px;
            background: var(--bg-card);
            padding: 16px 22px;
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .rank-item:hover {
            transform: translateX(4px);
            border-color: var(--accent);
            box-shadow: var(--shadow);
        }
        .rank-item .rank-num {
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            font-weight: 800;
            font-size: 1rem;
            background: var(--bg-soft);
            color: var(--text-soft);
            flex-shrink: 0;
        }
        .rank-item:nth-child(1) .rank-num {
            background: var(--accent);
            color: #fff;
        }
        .rank-item:nth-child(2) .rank-num {
            background: #e0d5c0;
            color: var(--primary);
        }
        .rank-item:nth-child(3) .rank-num {
            background: #d6cdb8;
            color: var(--primary);
        }
        .rank-item .rank-info {
            flex: 1;
            min-width: 0;
        }
        .rank-item .rank-info h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--text-dark);
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
        }
        .rank-item .rank-info .rank-meta {
            font-size: 0.82rem;
            color: var(--text-muted);
            margin-top: 2px;
        }
        .rank-item .rank-info .rank-meta i {
            margin-right: 4px;
            color: var(--accent);
        }
        .rank-item .rank-badge {
            padding: 4px 14px;
            border-radius: 40px;
            font-size: 0.75rem;
            font-weight: 600;
            background: rgba(201, 168, 76, 0.12);
            color: var(--accent-dark);
            flex-shrink: 0;
        }
        @media (max-width: 520px) {
            .rank-item {
                padding: 12px 16px;
                gap: 12px;
            }
            .rank-item .rank-num {
                width: 30px;
                height: 30px;
                font-size: 0.85rem;
            }
            .rank-item .rank-info h4 {
                font-size: 0.9rem;
            }
            .rank-item .rank-badge {
                padding: 3px 10px;
                font-size: 0.7rem;
            }
        }

        /* ===== 专题卡片 ===== */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }
        @media (max-width: 768px) {
            .feature-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }
        .feature-card {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            min-height: 260px;
            display: flex;
            align-items: flex-end;
            background: var(--primary-dark);
            box-shadow: var(--shadow);
            transition: var(--transition);
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-lg);
        }
        .feature-card .feature-bg {
            position: absolute;
            inset: 0;
            z-index: 0;
        }
        .feature-card .feature-bg img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .feature-card:hover .feature-bg img {
            transform: scale(1.04);
        }
        .feature-card .feature-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(15, 26, 38, 0.88) 0%, rgba(15, 26, 38, 0.30) 60%, transparent 100%);
            z-index: 1;
        }
        .feature-card .feature-content {
            position: relative;
            z-index: 2;
            padding: 32px 28px 28px;
            width: 100%;
        }
        .feature-card .feature-content h3 {
            font-size: 1.4rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 6px;
        }
        .feature-card .feature-content p {
            font-size: 0.92rem;
            color: rgba(255, 255, 255, 0.75);
            max-width: 360px;
            margin-bottom: 14px;
        }
        .feature-card .feature-content .btn-sm {
            padding: 8px 22px;
            font-size: 0.85rem;
            background: var(--accent);
            color: #fff;
            border-radius: var(--radius-sm);
            font-weight: 600;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            transition: var(--transition);
        }
        .feature-card .feature-content .btn-sm:hover {
            background: var(--accent-dark);
            transform: translateY(-1px);
            box-shadow: var(--shadow-accent);
        }
        @media (max-width: 520px) {
            .feature-card {
                min-height: 200px;
            }
            .feature-card .feature-content {
                padding: 20px 18px 18px;
            }
            .feature-card .feature-content h3 {
                font-size: 1.15rem;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 780px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .faq-item {
            background: var(--bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .faq-item:hover {
            border-color: var(--border);
        }
        .faq-item .faq-q {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-dark);
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            gap: 12px;
            transition: var(--transition);
            user-select: none;
        }
        .faq-item .faq-q:hover {
            color: var(--accent-dark);
        }
        .faq-item .faq-q i {
            font-size: 1.1rem;
            color: var(--accent);
            transition: var(--transition);
            flex-shrink: 0;
        }
        .faq-item.active .faq-q i {
            transform: rotate(180deg);
        }
        .faq-item .faq-a {
            padding: 0 24px 18px;
            font-size: 0.92rem;
            color: var(--text-soft);
            line-height: 1.7;
            display: none;
        }
        .faq-item.active .faq-a {
            display: block;
        }
        @media (max-width: 520px) {
            .faq-item .faq-q {
                padding: 14px 16px;
                font-size: 0.9rem;
            }
            .faq-item .faq-a {
                padding: 0 16px 14px;
                font-size: 0.85rem;
            }
        }

        /* ===== CTA ===== */
        .cta-block {
            text-align: center;
            padding: 64px 20px;
            background: var(--primary-dark) url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            background-blend-mode: overlay;
            border-radius: var(--radius-lg);
            position: relative;
            overflow: hidden;
        }
        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(26, 42, 58, 0.85) 0%, rgba(15, 26, 38, 0.75) 100%);
            z-index: 1;
            border-radius: var(--radius-lg);
        }
        .cta-block .container {
            position: relative;
            z-index: 2;
        }
        .cta-block h2 {
            font-size: 2rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-block p {
            color: rgba(255, 255, 255, 0.8);
            font-size: 1.05rem;
            max-width: 520px;
            margin: 0 auto 28px;
        }
        .cta-block .btn-primary {
            padding: 16px 44px;
            font-size: 1.1rem;
        }
        @media (max-width: 768px) {
            .cta-block {
                padding: 44px 16px;
            }
            .cta-block h2 {
                font-size: 1.5rem;
            }
            .cta-block p {
                font-size: 0.95rem;
            }
            .cta-block .btn-primary {
                padding: 14px 32px;
                font-size: 1rem;
            }
        }

        /* ===== Buttons ===== */
        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 30px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            background: var(--accent);
            color: #fff;
            border: 2px solid var(--accent);
            transition: var(--transition);
            box-shadow: var(--shadow-accent);
        }
        .btn-primary:hover {
            background: var(--accent-dark);
            border-color: var(--accent-dark);
            color: #fff;
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(201, 168, 76, 0.35);
        }
        .btn-primary:active {
            transform: translateY(0);
        }
        .btn-outline {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 12px 30px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 0.95rem;
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--border);
            transition: var(--transition);
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent-dark);
            background: rgba(201, 168, 76, 0.05);
            transform: translateY(-2px);
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary-dark);
            color: rgba(255, 255, 255, 0.7);
            padding: 60px 0 30px;
            margin-top: 80px;
        }
        .footer .container {
            max-width: var(--container);
            margin: 0 auto;
            padding: 0 20px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 32px;
            }
        }
        .footer-brand .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 14px;
        }
        .footer-brand .footer-logo i {
            color: var(--accent);
        }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 360px;
            color: rgba(255, 255, 255, 0.6);
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            font-size: 0.9rem;
            color: rgba(255, 255, 255, 0.6);
            padding: 5px 0;
            transition: var(--transition);
        }
        .footer-col a:hover {
            color: var(--accent);
            padding-left: 4px;
        }
        .footer-col a i {
            margin-right: 8px;
            color: var(--accent);
            width: 16px;
            text-align: center;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            padding-top: 24px;
            text-align: center;
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.45);
        }
        .footer-bottom a {
            color: rgba(255, 255, 255, 0.55);
        }
        .footer-bottom a:hover {
            color: var(--accent);
        }
        @media (max-width: 768px) {
            .footer {
                padding: 40px 0 20px;
                margin-top: 50px;
            }
            .footer-grid {
                gap: 24px;
            }
        }

        /* ===== 文章内页通用 ===== */
        .page-header {
            padding: 100px 0 60px;
            background: var(--primary-dark) url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            background-blend-mode: overlay;
            position: relative;
        }
        .page-header::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(26, 42, 58, 0.82) 0%, rgba(15, 26, 38, 0.70) 100%);
            z-index: 1;
        }
        .page-header .container {
            position: relative;
            z-index: 2;
            text-align: center;
        }
        .page-header h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 12px;
        }
        .page-header p {
            font-size: 1.05rem;
            color: rgba(255, 255, 255, 0.75);
            max-width: 560px;
            margin: 0 auto;
        }
        @media (max-width: 768px) {
            .page-header {
                padding: 70px 0 40px;
            }
            .page-header h1 {
                font-size: 1.8rem;
            }
            .page-header p {
                font-size: 0.95rem;
            }
        }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--text-muted);
            padding: 16px 0;
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-soft);
        }
        .breadcrumb a:hover {
            color: var(--accent-dark);
        }
        .breadcrumb i {
            font-size: 0.7rem;
            color: var(--border);
        }
        .breadcrumb span {
            color: var(--text-soft);
            font-weight: 500;
        }

        /* ===== 辅助 ===== */
        .text-center {
            text-align: center;
        }
        .mt-24 {
            margin-top: 24px;
        }
        .mt-40 {
            margin-top: 40px;
        }
        .mb-24 {
            margin-bottom: 24px;
        }
        .gap-16 {
            gap: 16px;
        }
        .flex-center {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        /* ===== 响应式微调 ===== */
        @media (max-width: 1024px) {
            .header-nav a {
                padding: 6px 14px;
                font-size: 0.88rem;
            }
        }
        @media (max-width: 768px) {
            .header-nav {
                display: none;
            }
            .header {
                height: var(--header-h);
            }
            .header-logo {
                font-size: 1.3rem;
            }
        }
        @media (min-width: 769px) {
            .bottom-tab {
                display: none !important;
            }
        }

        /* ===== 滚动渐入 ===== */
        .fade-up {
            opacity: 0;
            transform: translateY(24px);
            transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1), transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
        }
        .fade-up.visible {
            opacity: 1;
            transform: translateY(0);
        }

/* roulang page: article */
/* ===== Design Variables ===== */
        :root {
            --primary: #0f1b2d;
            --primary-light: #1a2d4a;
            --primary-dark: #080f1a;
            --accent: #d4a547;
            --accent-light: #e8c06a;
            --accent-dark: #b8892e;
            --bg: #f7f5f0;
            --bg-card: #ffffff;
            --bg-soft: #efebe6;
            --text: #1a1a2e;
            --text-light: #6b7280;
            --text-muted: #9ca3af;
            --border: #e5e0d8;
            --border-light: #f0ece6;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-xl: 28px;
            --shadow-sm: 0 2px 8px rgba(15, 27, 45, 0.06);
            --shadow-md: 0 6px 24px rgba(15, 27, 45, 0.08);
            --shadow-lg: 0 12px 40px rgba(15, 27, 45, 0.12);
            --shadow-accent: 0 6px 24px rgba(212, 165, 71, 0.25);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --max-width: 1200px;
            --content-width: 800px;
            --header-h: 72px;
            --tab-h: 64px;
        }

        /* ===== 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);
            background: var(--bg);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            padding-top: var(--header-h);
            padding-bottom: var(--tab-h);
        }
        @media (min-width: 769px) { body { padding-bottom: 0; } }

        a { color: var(--accent-dark); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--accent); }
        a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 4px; }

        img { max-width: 100%; height: auto; display: block; }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        button { cursor: pointer; border: none; background: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--primary); }

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

        .section { padding: 80px 0; }
        .section-title {
            font-size: 2rem;
            margin-bottom: 12px;
            text-align: center;
        }
        .section-sub {
            font-size: 1.05rem;
            color: var(--text-light);
            text-align: center;
            max-width: 640px;
            margin: 0 auto 48px;
            line-height: 1.6;
        }
        @media (max-width: 768px) {
            .section { padding: 48px 0; }
            .section-title { font-size: 1.5rem; }
            .section-sub { font-size: 0.95rem; margin-bottom: 32px; }
        }

        .badge {
            display: inline-block;
            padding: 4px 16px;
            border-radius: 999px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            background: var(--accent);
            color: var(--primary);
            line-height: 1.5;
        }
        .badge-soft {
            background: rgba(212, 165, 71, 0.15);
            color: var(--accent-dark);
        }
        .badge-outline {
            background: transparent;
            border: 1.5px solid var(--accent);
            color: var(--accent-dark);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-md);
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: none;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--accent);
            color: var(--primary);
        }
        .btn-primary:hover {
            background: var(--accent-light);
            color: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-accent);
        }
        .btn-primary:active { transform: translateY(0); box-shadow: none; }

        .btn-outline {
            background: transparent;
            color: var(--primary);
            border: 2px solid var(--border);
        }
        .btn-outline:hover {
            border-color: var(--accent);
            color: var(--accent-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow-sm);
        }

        .btn-ghost {
            background: rgba(15, 27, 45, 0.05);
            color: var(--primary);
        }
        .btn-ghost:hover {
            background: rgba(15, 27, 45, 0.1);
            transform: translateY(-1px);
        }

        .btn-lg { padding: 16px 36px; font-size: 1.05rem; border-radius: var(--radius-lg); }
        .btn-sm { padding: 8px 18px; font-size: 0.85rem; border-radius: var(--radius-sm); }

        /* ===== Header & Nav ===== */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            height: var(--header-h);
            background: rgba(15, 27, 45, 0.92);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border-bottom: 1px solid rgba(255,255,255,0.06);
            transition: var(--transition);
        }
        .header-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .header-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: #fff;
            letter-spacing: 0.5px;
        }
        .header-logo i { color: var(--accent); font-size: 1.5rem; }
        .header-logo:hover { color: var(--accent-light); }

        .header-nav {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .header-nav a {
            color: rgba(255,255,255,0.7);
            padding: 8px 18px;
            border-radius: var(--radius-sm);
            font-size: 0.92rem;
            font-weight: 500;
            transition: var(--transition);
            position: relative;
        }
        .header-nav a:hover { color: #fff; background: rgba(255,255,255,0.08); }
        .header-nav a.active {
            color: #fff;
            background: rgba(212, 165, 71, 0.2);
        }
        .header-nav a.active::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 3px;
            border-radius: 3px;
            background: var(--accent);
        }
        .header-cta {
            background: var(--accent) !important;
            color: var(--primary) !important;
            font-weight: 700 !important;
            padding: 10px 22px !important;
            border-radius: var(--radius-md) !important;
            margin-left: 8px;
        }
        .header-cta:hover {
            background: var(--accent-light) !important;
            transform: translateY(-1px);
            box-shadow: var(--shadow-accent);
        }

        @media (max-width: 768px) {
            .header-nav a { font-size: 0.85rem; padding: 6px 12px; }
            .header-nav a:not(.header-cta):nth-child(n+3) { display: none; }
            .header-logo { font-size: 1.15rem; }
            .header-inner { padding: 0 16px; }
        }

        /* ===== Mobile Bottom Tab ===== */
        .mobile-tab {
            display: none;
            position: fixed;
            bottom: 0;
            left: 0;
            right: 0;
            z-index: 999;
            height: var(--tab-h);
            background: rgba(15, 27, 45, 0.96);
            backdrop-filter: blur(16px) saturate(180%);
            -webkit-backdrop-filter: blur(16px) saturate(180%);
            border-top: 1px solid rgba(255,255,255,0.06);
            padding: 0 8px;
            align-items: center;
            justify-content: space-around;
        }
        .mobile-tab a {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 2px;
            padding: 6px 12px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.5);
            font-size: 0.65rem;
            font-weight: 500;
            transition: var(--transition);
            min-width: 60px;
        }
        .mobile-tab a i { font-size: 1.25rem; }
        .mobile-tab a:hover { color: rgba(255,255,255,0.8); }
        .mobile-tab a.active { color: var(--accent); }
        .mobile-tab a.tab-cta {
            background: var(--accent);
            color: var(--primary) !important;
            padding: 8px 20px;
            border-radius: var(--radius-lg);
            font-weight: 700;
        }
        .mobile-tab a.tab-cta i { font-size: 1.1rem; }

        @media (max-width: 768px) {
            .mobile-tab { display: flex; }
        }

        /* ===== Article Hero ===== */
        .article-hero {
            position: relative;
            min-height: 420px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: var(--primary-dark);
            overflow: hidden;
        }
        .article-hero-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.5;
            transform: scale(1.02);
            transition: transform 8s ease;
        }
        .article-hero:hover .article-hero-bg { transform: scale(1.06); }
        .article-hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,27,45,0.85) 0%, rgba(15,27,45,0.6) 50%, rgba(15,27,45,0.85) 100%);
        }
        .article-hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            padding: 40px 24px;
        }
        .article-hero .badge {
            margin-bottom: 20px;
            font-size: 0.85rem;
            padding: 6px 20px;
        }
        .article-hero h1 {
            font-size: 2.6rem;
            color: #fff;
            margin-bottom: 16px;
            line-height: 1.25;
            font-weight: 800;
            letter-spacing: -0.3px;
        }
        .article-hero-meta {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 24px;
            color: rgba(255,255,255,0.65);
            font-size: 0.9rem;
            flex-wrap: wrap;
        }
        .article-hero-meta span { display: flex; align-items: center; gap: 6px; }
        .article-hero-meta i { color: var(--accent); }

        @media (max-width: 768px) {
            .article-hero { min-height: 300px; }
            .article-hero h1 { font-size: 1.7rem; }
            .article-hero-content { padding: 24px 16px; }
            .article-hero-meta { gap: 12px; font-size: 0.8rem; }
        }
        @media (max-width: 520px) {
            .article-hero { min-height: 240px; }
            .article-hero h1 { font-size: 1.35rem; }
        }

        /* ===== Article Body ===== */
        .article-body-wrap {
            background: var(--bg);
            padding: 60px 0;
        }
        .article-body {
            max-width: var(--content-width);
            margin: 0 auto;
            padding: 0 24px;
        }
        .article-body-inner {
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            padding: 48px 56px;
            box-shadow: var(--shadow-md);
        }
        .article-body-inner .content {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--text);
        }
        .article-body-inner .content h2 {
            font-size: 1.5rem;
            margin: 36px 0 16px;
            color: var(--primary);
            padding-bottom: 8px;
            border-bottom: 2px solid var(--border-light);
        }
        .article-body-inner .content h3 {
            font-size: 1.2rem;
            margin: 28px 0 12px;
            color: var(--primary-light);
        }
        .article-body-inner .content p {
            margin-bottom: 18px;
        }
        .article-body-inner .content ul, 
        .article-body-inner .content ol {
            margin: 16px 0 20px;
            padding-left: 24px;
        }
        .article-body-inner .content ul li {
            list-style: disc;
            margin-bottom: 8px;
            color: var(--text);
        }
        .article-body-inner .content ol li {
            list-style: decimal;
            margin-bottom: 8px;
        }
        .article-body-inner .content blockquote {
            margin: 24px 0;
            padding: 20px 24px;
            border-left: 4px solid var(--accent);
            background: rgba(212, 165, 71, 0.06);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            font-style: italic;
            color: var(--text-light);
        }
        .article-body-inner .content img {
            border-radius: var(--radius-md);
            margin: 24px auto;
            box-shadow: var(--shadow-sm);
        }
        .article-body-inner .content a {
            color: var(--accent-dark);
            font-weight: 600;
            border-bottom: 1px solid transparent;
        }
        .article-body-inner .content a:hover {
            border-bottom-color: var(--accent);
        }
        .article-body-inner .content code {
            background: var(--bg-soft);
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 0.9em;
            font-family: 'Fira Code', monospace;
        }
        .article-body-inner .content pre {
            background: var(--primary);
            color: #e5e0d8;
            padding: 20px 24px;
            border-radius: var(--radius-md);
            overflow-x: auto;
            margin: 24px 0;
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .article-not-found {
            text-align: center;
            padding: 60px 24px;
        }
        .article-not-found i {
            font-size: 3rem;
            color: var(--text-muted);
            margin-bottom: 20px;
        }
        .article-not-found h2 {
            font-size: 1.6rem;
            margin-bottom: 12px;
        }
        .article-not-found p {
            color: var(--text-light);
            margin-bottom: 24px;
        }

        @media (max-width: 768px) {
            .article-body-wrap { padding: 32px 0; }
            .article-body-inner { padding: 28px 20px; border-radius: var(--radius-md); }
            .article-body-inner .content { font-size: 0.98rem; }
            .article-body-inner .content h2 { font-size: 1.25rem; }
            .article-body-inner .content h3 { font-size: 1.05rem; }
        }
        @media (max-width: 520px) {
            .article-body-inner { padding: 20px 16px; }
            .article-body-inner .content blockquote { padding: 14px 16px; }
        }

        /* ===== Article Footer Meta ===== */
        .article-footer-meta {
            margin-top: 40px;
            padding-top: 28px;
            border-top: 1px solid var(--border-light);
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }
        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        .article-tags .tag {
            padding: 4px 14px;
            border-radius: 999px;
            font-size: 0.78rem;
            font-weight: 500;
            background: var(--bg-soft);
            color: var(--text-light);
            transition: var(--transition);
        }
        .article-tags .tag:hover {
            background: var(--accent);
            color: var(--primary);
        }
        .article-share {
            display: flex;
            align-items: center;
            gap: 10px;
            color: var(--text-light);
            font-size: 0.88rem;
        }
        .article-share a {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--bg-soft);
            color: var(--text-light);
            transition: var(--transition);
            font-size: 0.95rem;
        }
        .article-share a:hover {
            background: var(--accent);
            color: var(--primary);
            transform: translateY(-2px);
        }

        @media (max-width: 520px) {
            .article-footer-meta { flex-direction: column; align-items: flex-start; }
        }

        /* ===== Related Posts ===== */
        .related-section {
            background: var(--bg);
            padding: 60px 0 80px;
        }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: 8px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }
        .related-card-img {
            aspect-ratio: 16 / 10;
            background: var(--bg-soft);
            overflow: hidden;
        }
        .related-card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }
        .related-card:hover .related-card-img img { transform: scale(1.05); }
        .related-card-body {
            padding: 18px 20px 20px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .related-card-body .badge {
            align-self: flex-start;
            margin-bottom: 10px;
            font-size: 0.7rem;
            padding: 3px 12px;
        }
        .related-card-body h3 {
            font-size: 1rem;
            font-weight: 700;
            line-height: 1.4;
            margin-bottom: 8px;
            flex: 1;
        }
        .related-card-body h3 a { color: var(--primary); }
        .related-card-body h3 a:hover { color: var(--accent-dark); }
        .related-card-body .meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        @media (max-width: 900px) {
            .related-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 520px) {
            .related-grid { grid-template-columns: 1fr; }
            .related-section { padding: 40px 0 56px; }
        }

        /* ===== CTA Section ===== */
        .cta-section {
            background: var(--primary);
            padding: 72px 0;
            text-align: center;
            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-section .container { position: relative; z-index: 2; }
        .cta-section h2 {
            font-size: 2rem;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-section p {
            color: rgba(255,255,255,0.7);
            font-size: 1.05rem;
            max-width: 560px;
            margin: 0 auto 28px;
        }
        .cta-section .btn {
            font-size: 1.05rem;
            padding: 16px 40px;
        }

        @media (max-width: 768px) {
            .cta-section { padding: 48px 0; }
            .cta-section h2 { font-size: 1.45rem; }
            .cta-section p { font-size: 0.9rem; }
        }

        /* ===== Article Bottom Nav ===== */
        .article-bottom-nav {
            background: var(--bg-soft);
            padding: 24px 0;
        }
        .article-bottom-nav .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 12px;
        }
        .article-bottom-nav a {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            color: var(--text-light);
            font-weight: 500;
            font-size: 0.92rem;
        }
        .article-bottom-nav a:hover { color: var(--accent-dark); }

        @media (max-width: 520px) {
            .article-bottom-nav .container { justify-content: center; text-align: center; }
        }

        /* ===== Footer ===== */
        .footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.7);
            padding: 60px 0 24px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: #fff;
            margin-bottom: 14px;
        }
        .footer-logo i { color: var(--accent); }
        .footer-brand p {
            font-size: 0.9rem;
            line-height: 1.7;
            color: rgba(255,255,255,0.55);
            max-width: 360px;
        }
        .footer-col h4 {
            color: #fff;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            color: rgba(255,255,255,0.55);
            font-size: 0.9rem;
            padding: 5px 0;
            transition: var(--transition);
        }
        .footer-col a:hover { color: var(--accent-light); padding-left: 4px; }
        .footer-col a i { width: 20px; margin-right: 6px; color: var(--accent); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 24px;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.4);
        }
        .footer-bottom a { color: rgba(255,255,255,0.5); }
        .footer-bottom a:hover { color: var(--accent-light); }

        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
            .footer-brand { grid-column: 1 / -1; }
            .footer { padding: 40px 0 20px; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }

        /* ===== Back to Top ===== */
        .back-top {
            position: fixed;
            bottom: calc(var(--tab-h) + 20px);
            right: 24px;
            z-index: 90;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.1rem;
            box-shadow: var(--shadow-md);
            transition: var(--transition);
            opacity: 0;
            pointer-events: none;
        }
        .back-top.visible { opacity: 1; pointer-events: auto; }
        .back-top:hover { background: var(--primary-light); transform: translateY(-3px); }
        @media (min-width: 769px) { .back-top { bottom: 32px; } }
        @media (max-width: 520px) { .back-top { right: 16px; width: 38px; height: 38px; font-size: 0.95rem; } }

        /* ===== Responsive Fine-tune ===== */
        @media (max-width: 480px) {
            .article-hero h1 { font-size: 1.2rem; }
            .article-body-inner { padding: 16px 12px; }
        }