/* roulang page: index */
:root {
            --bg-deep: #0B0C10;
            --bg-panel: #121212;
            --bg-card: rgba(255,255,255,0.04);
            --bg-card-hover: rgba(255,255,255,0.08);
            --bg-nav: #121212;
            --bg-section-alt: #1A1C2E;
            --accent: #00E5A1;
            --accent-hover: #00C98A;
            --accent-glow: rgba(0,229,161,0.5);
            --text-primary: #F3F4F6;
            --text-secondary: #D1D5DB;
            --text-muted: #9CA3AF;
            --text-dark: #000000;
            --border-subtle: rgba(255,255,255,0.08);
            --border-medium: rgba(255,255,255,0.12);
            --border-accent: #00E5A1;
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-xl: 30px;
            --shadow-card: 0 4px 16px rgba(0,0,0,0.3);
            --shadow-card-hover: 0 12px 32px rgba(0,0,0,0.5);
            --shadow-glow: 0 0 20px rgba(0,229,161,0.4);
            --nav-width: 240px;
            --font-hero: 48px;
            --font-h2: 32px;
            --font-h3: 24px;
            --font-h4: 20px;
            --font-card-title: 18px;
            --font-body: 16px;
            --font-sm: 14px;
            --font-xs: 12px;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-stack: "PingFang SC","Microsoft YaHei","Helvetica Neue",sans-serif;
        }

        *,*::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-stack);
            font-size:var(--font-body);
            line-height:1.7;
            color:var(--text-primary);
            background-color:var(--bg-deep);
            overflow-x:hidden;
            min-height:100vh;
        }
        a{text-decoration:none;color:inherit;transition:color var(--transition-fast);}
        a:hover{color:var(--accent);}
        img{max-width:100%;height:auto;display:block;}
        button,input,textarea{font-family:inherit;}
        ul,ol{list-style:none;padding:0;margin:0;}
        h1,h2,h3,h4,h5,h6{font-weight:700;line-height:1.3;color:var(--text-primary);}
        p{margin-bottom:1rem;color:var(--text-secondary);}
        .text-muted-custom{color:var(--text-muted)!important;}
        .text-accent{color:var(--accent)!important;}

        /* Bootstrap Overrides */
        .btn{font-weight:600;border-radius:var(--radius-xl);padding:10px 24px;transition:all var(--transition-smooth);letter-spacing:0.02em;}
        .btn-primary-custom{
            background:var(--accent);color:var(--text-dark);border:none;
        }
        .btn-primary-custom:hover{
            background:var(--accent-hover);color:var(--text-dark);box-shadow:var(--shadow-glow);transform:translateY(-2px);
        }
        .btn-outline-accent{
            background:transparent;color:var(--accent);border:1.5px solid var(--accent);
        }
        .btn-outline-accent:hover{
            background:rgba(0,229,161,0.1);color:var(--accent);box-shadow:0 0 12px rgba(0,229,161,0.3);transform:translateY(-2px);
        }
        .btn-lg-custom{padding:14px 36px;font-size:17px;border-radius:var(--radius-xl);}
        .btn-sm-custom{padding:8px 18px;font-size:var(--font-sm);border-radius:20px;}
        .card{border-radius:var(--radius-md);border:1px solid var(--border-subtle);background:var(--bg-card);backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px);transition:all var(--transition-smooth);}
        .card:hover{background:var(--bg-card-hover);transform:translateY(-4px);box-shadow:var(--shadow-card-hover);border-color:var(--border-medium);}
        .accordion-button{background:var(--bg-card)!important;color:var(--text-primary)!important;border:1px solid var(--border-subtle)!important;border-radius:var(--radius-md)!important;font-weight:600;font-size:var(--font-body);padding:16px 20px;}
        .accordion-button:not(.collapsed){background:rgba(0,229,161,0.06)!important;border-color:var(--accent)!important;color:var(--accent)!important;box-shadow:none!important;}
        .accordion-button:focus{box-shadow:none!important;border-color:var(--accent)!important;}
        .accordion-body{background:rgba(255,255,255,0.02);color:var(--text-secondary);border-radius:0 0 var(--radius-md) var(--radius-md);padding:18px 20px;line-height:1.8;}
        .accordion-item{background:transparent;border:none;margin-bottom:12px;}
        .badge-accent{background:var(--accent);color:var(--text-dark);font-weight:600;padding:5px 12px;border-radius:20px;font-size:var(--font-xs);letter-spacing:0.04em;}

        /* Layout */
        .app-layout{display:flex;min-height:100vh;position:relative;}
        .sidebar-nav{
            width:var(--nav-width);background:var(--bg-nav);position:fixed;top:0;left:0;height:100vh;
            z-index:1050;display:flex;flex-direction:column;border-right:1px solid var(--border-subtle);
            transition:transform var(--transition-smooth);
        }
        .sidebar-brand{
            padding:24px 20px 20px 20px;border-bottom:1px solid var(--border-subtle);
            display:flex;align-items:center;gap:8px;flex-shrink:0;
        }
        .sidebar-brand .brand-text{font-size:20px;font-weight:700;color:var(--text-primary);line-height:1.2;}
        .sidebar-brand .brand-sub{font-size:var(--font-xs);color:var(--text-muted);display:block;}
        .sidebar-nav-list{flex:1;padding:16px 12px;display:flex;flex-direction:column;gap:4px;overflow-y:auto;}
        .sidebar-nav-list a{
            display:flex;align-items:center;gap:10px;padding:11px 16px;border-radius:var(--radius-sm);
            color:var(--text-secondary);font-size:var(--font-body);font-weight:500;
            transition:all var(--transition-fast);position:relative;white-space:nowrap;
        }
        .sidebar-nav-list a:hover{background:rgba(255,255,255,0.04);color:var(--text-primary);}
        .sidebar-nav-list a.active{
            background:rgba(0,229,161,0.08);color:var(--accent);font-weight:600;
            border-left:3px solid var(--accent);padding-left:13px;
        }
        .sidebar-nav-list a i{width:20px;text-align:center;font-size:15px;flex-shrink:0;}
        .main-content{
            margin-left:var(--nav-width);flex:1;min-width:0;
            display:flex;flex-direction:column;
        }
        .mobile-top-nav{
            display:none;position:fixed;top:0;left:0;right:0;z-index:1040;
            background:var(--bg-panel);border-bottom:1px solid var(--border-subtle);
            padding:12px 16px;align-items:center;justify-content:space-between;
        }
        .mobile-brand-text{font-size:17px;font-weight:700;color:var(--text-primary);}
        .hamburger-btn{
            background:none;border:none;color:var(--text-primary);font-size:22px;
            cursor:pointer;padding:6px;line-height:1;
        }
        .mobile-menu-overlay{
            display:none;position:fixed;inset:0;z-index:1060;background:rgba(0,0,0,0.7);
        }
        .mobile-menu-panel{
            position:fixed;top:0;left:0;width:260px;height:100vh;z-index:1070;
            background:var(--bg-panel);border-right:1px solid var(--border-subtle);
            transform:translateX(-100%);transition:transform var(--transition-smooth);
            display:flex;flex-direction:column;padding:20px;
        }
        .mobile-menu-panel.open{transform:translateX(0);}
        .mobile-menu-panel a{
            display:flex;align-items:center;gap:10px;padding:13px 16px;border-radius:var(--radius-sm);
            color:var(--text-secondary);font-size:var(--font-body);font-weight:500;
        }
        .mobile-menu-panel a.active{background:rgba(0,229,161,0.08);color:var(--accent);font-weight:600;}
        .mobile-menu-close{
            align-self:flex-end;background:none;border:none;color:var(--text-primary);
            font-size:24px;cursor:pointer;padding:6px;margin-bottom:16px;
        }

        /* Hero */
        .hero-section{
            position:relative;background:url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            min-height:650px;display:flex;align-items:center;
        }
        .hero-overlay{
            position:absolute;inset:0;background:linear-gradient(135deg,rgba(11,12,16,0.85) 0%,rgba(11,12,16,0.7) 40%,rgba(26,28,46,0.75) 100%);
        }
        .hero-content{position:relative;z-index:2;width:100%;padding:60px 40px;}
        .hero-title{font-size:var(--font-hero);font-weight:700;color:#fff;line-height:1.2;margin-bottom:16px;letter-spacing:-0.02em;}
        .hero-subtitle{font-size:20px;color:var(--text-secondary);max-width:640px;line-height:1.6;margin-bottom:24px;}
        .hero-cta-group{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:40px;}
        .hero-compare-row{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;max-width:900px;}
        .compare-card{
            background:rgba(255,255,255,0.05);border:1.5px solid var(--border-subtle);
            border-radius:var(--radius-md);padding:22px 20px;text-align:center;
            transition:all var(--transition-smooth);position:relative;
        }
        .compare-card.recommended{
            background:rgba(0,229,161,0.07);border-color:var(--accent);
            transform:scale(1.04);box-shadow:0 0 24px rgba(0,229,161,0.2);
            z-index:2;
        }
        .compare-card.recommended .recommend-badge{
            position:absolute;top:-13px;left:50%;transform:translateX(-50%);
            background:var(--accent);color:var(--text-dark);font-weight:700;
            padding:5px 16px;border-radius:20px;font-size:var(--font-xs);letter-spacing:0.04em;
        }
        .compare-card .compare-name{font-size:var(--font-h4);font-weight:700;color:var(--text-primary);margin-bottom:6px;}
        .compare-card .compare-price{font-size:28px;font-weight:700;color:var(--accent);margin-bottom:4px;}
        .compare-card .compare-desc{font-size:var(--font-sm);color:var(--text-muted);margin-bottom:12px;}
        .compare-card .compare-features{list-style:none;padding:0;margin:0 0 16px;text-align:left;font-size:var(--font-sm);color:var(--text-secondary);}
        .compare-card .compare-features li{padding:4px 0;display:flex;align-items:center;gap:8px;}
        .compare-card .compare-features li i{color:var(--accent);font-size:12px;}

        /* Section Common */
        .section-block{padding:70px 40px;}
        .section-block-alt{background:var(--bg-section-alt);}
        .section-label{display:inline-block;font-size:var(--font-xs);font-weight:700;color:var(--accent);text-transform:uppercase;letter-spacing:0.08em;margin-bottom:8px;}
        .section-title{font-size:var(--font-h2);font-weight:700;color:var(--text-primary);margin-bottom:12px;}
        .section-desc{font-size:var(--font-body);color:var(--text-muted);max-width:680px;margin-bottom:36px;line-height:1.7;}

        /* Horizontal Track */
        .track-wrapper{position:relative;}
        .track-scroll{
            display:flex;gap:16px;overflow-x:auto;scroll-snap-type:x mandatory;
            padding-bottom:16px;-webkit-overflow-scrolling:touch;
            scrollbar-width:thin;scrollbar-color:rgba(255,255,255,0.15) transparent;
        }
        .track-scroll::-webkit-scrollbar{height:5px;}
        .track-scroll::-webkit-scrollbar-track{background:transparent;}
        .track-scroll::-webkit-scrollbar-thumb{background:rgba(255,255,255,0.15);border-radius:10px;}
        .track-card{
            flex:0 0 280px;scroll-snap-align:start;border-radius:var(--radius-md);
            overflow:hidden;background:var(--bg-card);border:1px solid var(--border-subtle);
            transition:all var(--transition-smooth);cursor:pointer;position:relative;
            min-height:360px;display:flex;flex-direction:column;
        }
        .track-card:hover{transform:scale(1.03);box-shadow:var(--shadow-card-hover);border-color:var(--border-medium);z-index:3;}
        .track-card .track-card-img{
            width:100%;height:200px;object-fit:cover;flex-shrink:0;
        }
        .track-card .track-card-info{
            background:linear-gradient(180deg,transparent 0%,rgba(0,0,0,0.8) 40%);
            padding:16px;flex:1;display:flex;flex-direction:column;justify-content:flex-end;
            position:relative;margin-top:-60px;z-index:2;
        }
        .track-card .track-card-title{font-size:var(--font-card-title);font-weight:700;color:#fff;margin-bottom:4px;}
        .track-card .track-card-meta{font-size:var(--font-xs);color:var(--text-muted);}
        .track-card .track-card-cta{display:inline-block;margin-top:8px;font-size:var(--font-sm);font-weight:600;color:var(--accent);}

        /* Vertical Cards Grid (竖屏种草) */
        .vertical-card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(180px,1fr));gap:16px;}
        .vertical-card{
            background:var(--bg-card);border:1px solid var(--border-subtle);
            border-radius:var(--radius-md);overflow:hidden;text-align:center;
            transition:all var(--transition-smooth);cursor:pointer;
        }
        .vertical-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-card-hover);border-color:var(--accent);}
        .vertical-card img{width:100%;aspect-ratio:9/16;object-fit:cover;}
        .vertical-card .vcard-body{padding:14px 12px;}
        .vertical-card .vcard-title{font-size:var(--font-sm);font-weight:700;color:var(--text-primary);margin-bottom:4px;line-height:1.4;}
        .vertical-card .vcard-cta{font-size:var(--font-xs);font-weight:600;color:var(--accent);margin-top:6px;display:inline-block;}

        /* Compare Table */
        .compare-table-wrap{overflow-x:auto;border-radius:var(--radius-md);border:1px solid var(--border-subtle);}
        .compare-table{width:100%;border-collapse:collapse;min-width:600px;}
        .compare-table th,.compare-table td{padding:14px 18px;text-align:center;border-bottom:1px solid var(--border-subtle);}
        .compare-table th{background:rgba(255,255,255,0.03);font-weight:700;color:var(--text-primary);font-size:var(--font-sm);}
        .compare-table th:first-child,.compare-table td:first-child{text-align:left;font-weight:600;color:var(--text-primary);}
        .compare-table td{color:var(--text-secondary);font-size:var(--font-sm);}
        .compare-table .col-recommend{background:rgba(0,229,161,0.04);}
        .compare-table .col-recommend th{color:var(--accent);}
        .compare-table i.fa-check{color:var(--accent);}
        .compare-table i.fa-minus{color:var(--text-muted);}

        /* Step Guide */
        .steps-row{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;}
        .step-card{
            text-align:center;padding:28px 20px;background:var(--bg-card);
            border:1px solid var(--border-subtle);border-radius:var(--radius-md);
            position:relative;transition:all var(--transition-smooth);
        }
        .step-card:hover{background:var(--bg-card-hover);transform:translateY(-3px);}
        .step-number{
            width:52px;height:52px;border-radius:50%;background:var(--accent);
            color:var(--text-dark);font-weight:700;font-size:22px;
            display:flex;align-items:center;justify-content:center;
            margin:0 auto 16px;
        }
        .step-card h4{font-size:var(--font-h4);font-weight:700;color:var(--text-primary);margin-bottom:8px;}
        .step-card p{font-size:var(--font-sm);color:var(--text-muted);margin:0;}

        /* Tier Cards (优惠阶梯) */
        .tier-row{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;align-items:start;}
        .tier-card{
            background:var(--bg-card);border:1.5px solid var(--border-subtle);
            border-radius:var(--radius-md);padding:28px 22px;text-align:center;
            transition:all var(--transition-smooth);position:relative;
        }
        .tier-card.tier-highlight{
            background:rgba(0,229,161,0.06);border-color:var(--accent);
            box-shadow:0 0 28px rgba(0,229,161,0.15);
        }
        .tier-badge{
            display:inline-block;background:var(--accent);color:var(--text-dark);
            font-weight:700;padding:6px 18px;border-radius:20px;font-size:var(--font-xs);
            margin-bottom:12px;letter-spacing:0.04em;
        }
        .tier-name{font-size:var(--font-h4);font-weight:700;color:var(--text-primary);margin-bottom:6px;}
        .tier-price{font-size:36px;font-weight:700;color:var(--accent);margin-bottom:4px;}
        .tier-price small{font-size:var(--font-sm);color:var(--text-muted);font-weight:400;}
        .tier-desc{font-size:var(--font-sm);color:var(--text-muted);margin-bottom:14px;}
        .tier-features{list-style:none;padding:0;margin:0 0 18px;text-align:left;font-size:var(--font-sm);color:var(--text-secondary);}
        .tier-features li{padding:5px 0;display:flex;align-items:center;gap:8px;}
        .tier-features li i{color:var(--accent);font-size:11px;}
        .tier-progress{margin-top:12px;}
        .tier-progress .progress{
            height:8px;border-radius:10px;background:rgba(255,255,255,0.08);
        }
        .tier-progress .progress-bar{background:var(--accent);border-radius:10px;}
        .tier-progress-text{font-size:var(--font-xs);color:var(--text-muted);margin-top:6px;}

        /* News List */
        .news-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:20px;}
        .news-card{
            background:var(--bg-card);border:1px solid var(--border-subtle);
            border-radius:var(--radius-md);padding:20px;transition:all var(--transition-smooth);
            display:flex;flex-direction:column;
        }
        .news-card:hover{background:var(--bg-card-hover);border-color:var(--border-medium);}
        .news-card .news-tag{display:inline-block;font-size:var(--font-xs);font-weight:600;color:var(--accent);margin-bottom:8px;}
        .news-card .news-title{font-size:var(--font-card-title);font-weight:700;color:var(--text-primary);margin-bottom:8px;line-height:1.4;}
        .news-card .news-summary{font-size:var(--font-sm);color:var(--text-muted);line-height:1.6;flex:1;margin-bottom:12px;}
        .news-card .news-meta{font-size:var(--font-xs);color:var(--text-muted);display:flex;justify-content:space-between;align-items:center;}
        .news-card .news-link{font-weight:600;color:var(--accent);font-size:var(--font-sm);}
        .news-empty{text-align:center;padding:60px 20px;color:var(--text-muted);}
        .news-empty i{font-size:48px;display:block;margin-bottom:16px;opacity:0.5;}

        /* CTA Section */
        .cta-section{
            background:linear-gradient(135deg,var(--bg-section-alt) 0%,#0d0f1a 100%);
            text-align:center;padding:60px 40px;border-top:1px solid var(--border-subtle);
            border-bottom:1px solid var(--border-subtle);
        }
        .cta-section .cta-title{font-size:var(--font-h2);font-weight:700;color:#fff;margin-bottom:12px;}
        .cta-section .cta-desc{font-size:var(--font-body);color:var(--text-secondary);max-width:500px;margin:0 auto 24px;}

        /* FAQ */
        .faq-wrap{max-width:800px;margin:0 auto;}

        /* Footer */
        .site-footer{
            background:var(--bg-panel);border-top:1px solid var(--border-subtle);
            padding:40px;display:grid;grid-template-columns:2fr 1fr 1fr;gap:30px;
        }
        .footer-brand .footer-logo{font-size:20px;font-weight:700;color:var(--text-primary);margin-bottom:8px;}
        .footer-brand p{font-size:var(--font-sm);color:var(--text-muted);}
        .footer-col h5{font-size:var(--font-sm);font-weight:700;color:var(--text-primary);margin-bottom:12px;text-transform:uppercase;letter-spacing:0.04em;}
        .footer-col a{display:block;font-size:var(--font-sm);color:var(--text-muted);padding:4px 0;transition:color var(--transition-fast);}
        .footer-col a:hover{color:var(--accent);}
        .footer-bottom{
            grid-column:1/-1;border-top:1px solid var(--border-subtle);padding-top:16px;
            font-size:var(--font-xs);color:var(--text-muted);text-align:center;
        }

        /* form */
        .input-dark{
            background:rgba(255,255,255,0.05);border:1px solid var(--border-subtle);
            color:var(--text-primary);border-radius:var(--radius-xl);padding:12px 20px;
            font-size:var(--font-body);width:100%;transition:border-color var(--transition-fast);
        }
        .input-dark:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(0,229,161,0.1);}

        /* Responsive */
        @media(max-width:992px){
            .sidebar-nav{transform:translateX(-100%);}
            .main-content{margin-left:0;}
            .mobile-top-nav{display:flex;}
            .mobile-menu-overlay.active{display:block;}
            .section-block{padding:40px 20px;}
            .hero-section{min-height:auto;padding-top:60px;}
            .hero-content{padding:40px 20px;}
            .hero-title{font-size:32px;}
            .hero-subtitle{font-size:17px;}
            .hero-compare-row{grid-template-columns:1fr;max-width:100%;}
            .compare-card.recommended{transform:scale(1);}
            .steps-row{grid-template-columns:repeat(2,1fr);}
            .tier-row{grid-template-columns:1fr;}
            .site-footer{grid-template-columns:1fr;gap:20px;}
            .section-title{font-size:26px;}
            .vertical-card-grid{grid-template-columns:repeat(2,1fr);}
            .news-grid{grid-template-columns:1fr;}
            .track-card{flex:0 0 220px;min-height:300px;}
            .track-card .track-card-img{height:150px;}
        }

        @media(max-width:576px){
            .hero-title{font-size:26px;}
            .steps-row{grid-template-columns:1fr;}
            .vertical-card-grid{grid-template-columns:repeat(2,1fr);gap:10px;}
            .section-block{padding:32px 14px;}
            .hero-content{padding:32px 14px;}
            .compare-table-wrap{font-size:var(--font-xs);}
            .cta-section{padding:40px 20px;}
            .cta-section .cta-title{font-size:24px;}
            .track-card{flex:0 0 200px;min-height:270px;}
        }

/* roulang page: category1 */
:root {
            --bg-deep: #0B0C10;
            --bg-nav: #121212;
            --bg-card: rgba(255, 255, 255, 0.04);
            --bg-card-hover: rgba(255, 255, 255, 0.08);
            --bg-section: #1A1C2E;
            --accent: #00E5A1;
            --accent-hover: #00C98A;
            --accent-glow: rgba(0, 229, 161, 0.5);
            --text-primary: #F3F4F6;
            --text-secondary: #D1D5DB;
            --text-muted: #9CA3AF;
            --border-subtle: rgba(255, 255, 255, 0.08);
            --border-light: rgba(255, 255, 255, 0.05);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --radius-btn: 30px;
            --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.3);
            --shadow-card-hover: 0 12px 24px rgba(0, 0, 0, 0.5);
            --shadow-glow: 0 0 20px rgba(0, 229, 161, 0.35);
            --nav-width: 240px;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-stack: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', sans-serif;
        }

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

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

        body {
            margin: 0;
            padding: 0;
            font-family: var(--font-stack);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg-deep);
            min-height: 100vh;
            overflow-x: hidden;
        }

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

        a:hover {
            color: var(--accent);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button {
            cursor: pointer;
            font-family: inherit;
        }

        input {
            font-family: inherit;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            margin-top: 0;
            font-weight: 700;
            line-height: 1.25;
            color: var(--text-primary);
        }

        h1 {
            font-size: 2.75rem;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: 2rem;
            letter-spacing: -0.01em;
        }
        h3 {
            font-size: 1.35rem;
        }
        h4 {
            font-size: 1.1rem;
        }

        p {
            margin-top: 0;
            margin-bottom: 1rem;
        }

        .text-muted {
            color: var(--text-muted) !important;
        }
        .text-accent {
            color: var(--accent) !important;
        }

        /* ========== 桌面端左侧竖向导航 ========== */
        .side-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background-color: var(--bg-nav);
            z-index: 1000;
            display: flex;
            flex-direction: column;
            border-right: 1px solid var(--border-light);
            overflow-y: auto;
            padding: 0;
        }

        .side-nav-brand {
            padding: 28px 24px 20px;
            border-bottom: 1px solid var(--border-light);
            flex-shrink: 0;
        }

        .side-nav-brand .brand-main {
            font-size: 1.25rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.03em;
            display: block;
            line-height: 1.3;
        }

        .side-nav-brand .brand-sub {
            font-size: 0.78rem;
            color: var(--text-muted);
            display: block;
            margin-top: 2px;
            letter-spacing: 0.04em;
        }

        .side-nav-list {
            list-style: none;
            margin: 0;
            padding: 16px 0;
            flex: 1;
        }

        .side-nav-list li {
            margin: 0;
            padding: 0;
        }

        .side-nav-list li a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 13px 24px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-left: 3px solid transparent;
            transition: all var(--transition-fast);
            letter-spacing: 0.02em;
            white-space: nowrap;
        }

        .side-nav-list li a:hover {
            color: #fff;
            background: rgba(255, 255, 255, 0.03);
            border-left-color: rgba(0, 229, 161, 0.4);
        }

        .side-nav-list li a.active {
            color: #fff;
            background: rgba(0, 229, 161, 0.07);
            border-left-color: var(--accent);
            font-weight: 600;
        }

        .side-nav-list li a i {
            width: 18px;
            text-align: center;
            font-size: 0.9rem;
            color: var(--text-muted);
            transition: color var(--transition-fast);
        }

        .side-nav-list li a.active i,
        .side-nav-list li a:hover i {
            color: var(--accent);
        }

        .side-nav-footer {
            padding: 16px 24px;
            border-top: 1px solid var(--border-light);
            flex-shrink: 0;
        }

        .side-nav-footer .nav-cta {
            display: block;
            text-align: center;
            padding: 10px 18px;
            background: var(--accent);
            color: #000;
            font-weight: 600;
            font-size: 0.88rem;
            border-radius: var(--radius-btn);
            transition: all var(--transition-smooth);
            letter-spacing: 0.03em;
        }

        .side-nav-footer .nav-cta:hover {
            background: var(--accent-hover);
            box-shadow: var(--shadow-glow);
            color: #000;
            transform: translateY(-1px);
        }

        /* ========== 移动端顶部导航 ========== */
        .mobile-top-nav {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 999;
            background: var(--bg-nav);
            border-bottom: 1px solid var(--border-light);
            padding: 12px 16px;
            align-items: center;
            justify-content: space-between;
            height: 56px;
        }

        .mobile-brand-text {
            font-size: 1.05rem;
            font-weight: 700;
            color: #fff;
            letter-spacing: 0.03em;
            white-space: nowrap;
        }

        .hamburger-btn {
            background: none;
            border: none;
            color: #fff;
            font-size: 1.4rem;
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .hamburger-btn:hover {
            background: rgba(255, 255, 255, 0.08);
        }

        .mobile-menu-panel {
            display: none;
            position: fixed;
            top: 56px;
            left: 0;
            right: 0;
            background: var(--bg-nav);
            border-bottom: 1px solid var(--border-light);
            z-index: 998;
            padding: 8px 0;
            flex-direction: column;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.6);
        }

        .mobile-menu-panel.open {
            display: flex;
        }

        .mobile-menu-panel a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 14px 20px;
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-left: 3px solid transparent;
            transition: all var(--transition-fast);
            letter-spacing: 0.02em;
        }

        .mobile-menu-panel a:hover,
        .mobile-menu-panel a.active {
            color: #fff;
            background: rgba(0, 229, 161, 0.07);
            border-left-color: var(--accent);
        }

        .mobile-menu-panel a i {
            width: 18px;
            text-align: center;
            font-size: 0.9rem;
            color: var(--text-muted);
        }

        /* ========== 主内容区 ========== */
        .main-content {
            margin-left: var(--nav-width);
            min-height: 100vh;
            position: relative;
        }

        /* ========== Hero 资源下载站风格 ========== */
        .hero-category {
            position: relative;
            min-height: 520px;
            display: flex;
            align-items: center;
            justify-content: center;
            text-align: center;
            background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
            overflow: hidden;
            padding: 80px 24px 60px;
        }

        .hero-category::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(10, 12, 16, 0.82) 0%, rgba(10, 12, 16, 0.9) 60%, rgba(10, 12, 16, 0.95) 100%);
            z-index: 1;
        }

        .hero-category .hero-inner {
            position: relative;
            z-index: 2;
            max-width: 680px;
            width: 100%;
        }

        .hero-category .hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(0, 229, 161, 0.12);
            border: 1px solid rgba(0, 229, 161, 0.3);
            border-radius: 20px;
            color: var(--accent);
            font-size: 0.82rem;
            font-weight: 500;
            letter-spacing: 0.05em;
            margin-bottom: 18px;
        }

        .hero-category h1 {
            font-size: 2.8rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 14px;
            letter-spacing: -0.02em;
            line-height: 1.2;
        }

        .hero-category .hero-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            margin-bottom: 28px;
            line-height: 1.6;
            max-width: 520px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-search-wrap {
            position: relative;
            max-width: 480px;
            margin: 0 auto 28px;
        }

        .hero-search-wrap input {
            width: 100%;
            padding: 16px 52px 16px 22px;
            background: rgba(255, 255, 255, 0.07);
            border: 1px solid rgba(255, 255, 255, 0.18);
            border-radius: var(--radius-btn);
            color: #fff;
            font-size: 0.95rem;
            outline: none;
            transition: all var(--transition-smooth);
            backdrop-filter: blur(4px);
        }

        .hero-search-wrap input::placeholder {
            color: var(--text-muted);
        }
        .hero-search-wrap input:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 4px rgba(0, 229, 161, 0.08);
            background: rgba(255, 255, 255, 0.1);
        }

        .hero-search-wrap .search-icon-btn {
            position: absolute;
            right: 6px;
            top: 50%;
            transform: translateY(-50%);
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: var(--accent);
            color: #000;
            border: none;
            font-size: 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all var(--transition-fast);
        }

        .hero-search-wrap .search-icon-btn:hover {
            background: var(--accent-hover);
            box-shadow: var(--shadow-glow);
        }

        .hero-quick-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            max-width: 520px;
            margin: 0 auto;
        }

        .hero-quick-tags .quick-tag {
            display: inline-block;
            padding: 8px 16px;
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-subtle);
            border-radius: 22px;
            color: var(--text-secondary);
            font-size: 0.84rem;
            cursor: pointer;
            transition: all var(--transition-fast);
            white-space: nowrap;
            letter-spacing: 0.02em;
        }

        .hero-quick-tags .quick-tag:hover {
            background: rgba(0, 229, 161, 0.1);
            border-color: var(--accent);
            color: var(--accent);
            transform: translateY(-2px);
            box-shadow: 0 4px 12px rgba(0, 229, 161, 0.2);
        }

        /* ========== 通用板块 ========== */
        .section-block {
            padding: 70px 24px;
            position: relative;
        }

        .section-block.alt-bg {
            background: rgba(255, 255, 255, 0.015);
            border-top: 1px solid var(--border-light);
            border-bottom: 1px solid var(--border-light);
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-header h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 10px;
            letter-spacing: -0.01em;
        }

        .section-header .section-lead {
            color: var(--text-muted);
            font-size: 1rem;
            max-width: 560px;
            margin: 0 auto;
            line-height: 1.6;
        }

        .section-inner {
            max-width: 1100px;
            margin: 0 auto;
        }

        /* ========== 步骤流程 ========== */
        .steps-flow {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            justify-content: center;
            counter-reset: step-counter;
        }

        .step-card {
            flex: 1 1 220px;
            max-width: 260px;
            min-width: 200px;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px 20px 22px;
            text-align: center;
            position: relative;
            transition: all var(--transition-smooth);
            backdrop-filter: blur(6px);
        }

        .step-card:hover {
            background: var(--bg-card-hover);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: rgba(0, 229, 161, 0.25);
        }

        .step-card .step-num {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: rgba(0, 229, 161, 0.15);
            color: var(--accent);
            font-weight: 700;
            font-size: 1.15rem;
            margin-bottom: 14px;
            border: 2px solid rgba(0, 229, 161, 0.3);
            transition: all var(--transition-fast);
        }

        .step-card:hover .step-num {
            background: var(--accent);
            color: #000;
            border-color: var(--accent);
            box-shadow: var(--shadow-glow);
        }

        .step-card h3 {
            font-size: 1.05rem;
            margin-bottom: 8px;
            color: #fff;
        }

        .step-card p {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.55;
        }

        /* ========== 横向片单轨道 ========== */
        .track-rail {
            position: relative;
            overflow-x: auto;
            overflow-y: visible;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
            padding-bottom: 12px;
            display: flex;
            gap: 16px;
            scrollbar-width: thin;
            scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
        }

        .track-rail::-webkit-scrollbar {
            height: 5px;
        }
        .track-rail::-webkit-scrollbar-track {
            background: transparent;
        }
        .track-rail::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.15);
            border-radius: 10px;
        }

        .track-card {
            flex: 0 0 280px;
            scroll-snap-align: start;
            border-radius: var(--radius-md);
            overflow: hidden;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            transition: all var(--transition-smooth);
            cursor: pointer;
            position: relative;
            min-height: 280px;
            display: flex;
            flex-direction: column;
        }

        .track-card:hover {
            transform: scale(1.03);
            box-shadow: var(--shadow-card-hover);
            border-color: rgba(0, 229, 161, 0.3);
            z-index: 5;
        }

        .track-card .track-card-img {
            width: 100%;
            aspect-ratio: 16 / 9;
            object-fit: cover;
            display: block;
            flex-shrink: 0;
        }

        .track-card .track-card-info {
            padding: 16px 18px;
            flex: 1;
            display: flex;
            flex-direction: column;
            justify-content: flex-end;
            background: linear-gradient(180deg, transparent 0%, rgba(0, 0, 0, 0.7) 40%, rgba(0, 0, 0, 0.9) 100%);
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            min-height: 100px;
            pointer-events: none;
        }

        .track-card .track-card-info h4 {
            font-size: 0.95rem;
            font-weight: 600;
            color: #fff;
            margin-bottom: 4px;
            pointer-events: auto;
        }

        .track-card .track-card-info .track-tag {
            display: inline-block;
            font-size: 0.75rem;
            color: var(--accent);
            background: rgba(0, 229, 161, 0.12);
            padding: 3px 10px;
            border-radius: 12px;
            pointer-events: auto;
            width: fit-content;
        }

        /* ========== 功能亮点 双列布局 ========== */
        .feature-grid-dual {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        .feature-item-dual {
            display: flex;
            gap: 16px;
            align-items: flex-start;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 22px 20px;
            transition: all var(--transition-smooth);
            backdrop-filter: blur(6px);
        }

        .feature-item-dual:hover {
            background: var(--bg-card-hover);
            border-color: rgba(0, 229, 161, 0.25);
            transform: translateY(-2px);
            box-shadow: var(--shadow-card);
        }

        .feature-item-dual .fi-icon {
            flex-shrink: 0;
            width: 48px;
            height: 48px;
            border-radius: var(--radius-sm);
            background: rgba(0, 229, 161, 0.1);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            color: var(--accent);
            border: 1px solid rgba(0, 229, 161, 0.2);
        }

        .feature-item-dual .fi-body h4 {
            font-size: 1rem;
            margin-bottom: 5px;
            color: #fff;
        }
        .feature-item-dual .fi-body p {
            font-size: 0.88rem;
            color: var(--text-muted);
            margin: 0;
            line-height: 1.55;
        }

        /* ========== FAQ Accordion ========== */
        .faq-accordion {
            max-width: 760px;
            margin: 0 auto;
        }

        .faq-item {
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            margin-bottom: 10px;
            overflow: hidden;
            background: var(--bg-card);
            transition: all var(--transition-fast);
        }

        .faq-item.active-faq {
            border-color: var(--accent);
        }

        .faq-question {
            width: 100%;
            background: none;
            border: none;
            color: #fff;
            font-size: 1rem;
            font-weight: 600;
            padding: 18px 20px;
            text-align: left;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 12px;
            transition: color var(--transition-fast);
            letter-spacing: 0.02em;
        }

        .faq-question:hover {
            color: var(--accent);
        }

        .faq-question .faq-icon {
            flex-shrink: 0;
            transition: transform var(--transition-smooth);
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .faq-item.active-faq .faq-question .faq-icon {
            transform: rotate(180deg);
            color: var(--accent);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            padding: 0 20px;
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
        }

        .faq-item.active-faq .faq-answer {
            max-height: 300px;
            padding: 0 20px 18px;
        }

        /* ========== CTA 板块 ========== */
        .cta-section {
            text-align: center;
            padding: 70px 24px;
            background: linear-gradient(180deg, rgba(0, 229, 161, 0.03) 0%, transparent 60%);
        }

        .cta-section h2 {
            font-size: 1.9rem;
            margin-bottom: 12px;
            color: #fff;
        }
        .cta-section .cta-lead {
            color: var(--text-muted);
            margin-bottom: 28px;
            font-size: 1rem;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }

        .btn-accent {
            display: inline-block;
            padding: 14px 32px;
            background: var(--accent);
            color: #000;
            font-weight: 600;
            border-radius: var(--radius-btn);
            border: none;
            font-size: 1rem;
            letter-spacing: 0.03em;
            transition: all var(--transition-smooth);
        }
        .btn-accent:hover {
            background: var(--accent-hover);
            box-shadow: var(--shadow-glow);
            color: #000;
            transform: translateY(-2px);
        }

        .btn-outline-accent {
            display: inline-block;
            padding: 13px 30px;
            background: transparent;
            color: var(--accent);
            font-weight: 600;
            border-radius: var(--radius-btn);
            border: 2px solid var(--accent);
            font-size: 1rem;
            letter-spacing: 0.03em;
            transition: all var(--transition-smooth);
            margin-left: 12px;
        }
        .btn-outline-accent:hover {
            background: rgba(0, 229, 161, 0.1);
            color: var(--accent);
            box-shadow: 0 0 12px rgba(0, 229, 161, 0.25);
            transform: translateY(-2px);
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background: var(--bg-nav);
            border-top: 1px solid var(--border-light);
            padding: 48px 24px 28px;
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 30px;
            max-width: 1100px;
            margin: 0 auto;
        }

        .site-footer .footer-brand .footer-logo {
            font-size: 1.2rem;
            font-weight: 700;
            color: #fff;
            margin-bottom: 8px;
            letter-spacing: 0.03em;
        }
        .site-footer .footer-brand p {
            color: var(--text-muted);
            font-size: 0.88rem;
            line-height: 1.6;
            margin: 0;
        }

        .site-footer .footer-col h5 {
            color: #fff;
            font-size: 0.9rem;
            font-weight: 600;
            margin-bottom: 12px;
            letter-spacing: 0.04em;
        }
        .site-footer .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.86rem;
            padding: 4px 0;
            transition: color var(--transition-fast);
        }
        .site-footer .footer-col a:hover {
            color: var(--accent);
        }

        .site-footer .footer-bottom {
            grid-column: 1 / -1;
            border-top: 1px solid var(--border-light);
            padding-top: 16px;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.8rem;
            letter-spacing: 0.03em;
        }

        /* ========== 面包屑 ========== */
        .breadcrumb-row {
            padding: 16px 24px 0;
            max-width: 1100px;
            margin: 0 auto;
        }
        .breadcrumb-row ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            padding: 0;
            margin: 0;
            font-size: 0.84rem;
            color: var(--text-muted);
            gap: 6px;
            align-items: center;
        }
        .breadcrumb-row ol li+li::before {
            content: '/';
            margin-right: 6px;
            color: var(--text-muted);
        }
        .breadcrumb-row ol li a {
            color: var(--text-muted);
        }
        .breadcrumb-row ol li a:hover {
            color: var(--accent);
        }
        .breadcrumb-row ol li.active-bc {
            color: var(--accent);
            font-weight: 500;
        }

        /* ========== 响应式 ========== */
        @media (max-width: 992px) {
            .side-nav {
                display: none;
            }
            .mobile-top-nav {
                display: flex;
            }
            .main-content {
                margin-left: 0;
                padding-top: 56px;
            }
            .hero-category {
                min-height: 420px;
                padding: 60px 16px 40px;
            }
            .hero-category h1 {
                font-size: 2rem;
            }
            .hero-category .hero-subtitle {
                font-size: 0.95rem;
            }
            .section-block {
                padding: 48px 16px;
            }
            .section-header h2 {
                font-size: 1.55rem;
            }
            .feature-grid-dual {
                grid-template-columns: 1fr;
            }
            .steps-flow {
                gap: 14px;
            }
            .step-card {
                flex: 1 1 150px;
                max-width: none;
                min-width: 140px;
                padding: 20px 14px 16px;
            }
            .track-card {
                flex: 0 0 220px;
                min-height: 240px;
            }
            .site-footer {
                grid-template-columns: 1fr 1fr;
                gap: 20px;
                padding: 36px 16px 20px;
            }
            .site-footer .footer-brand {
                grid-column: 1 / -1;
            }
            .cta-section {
                padding: 48px 16px;
            }
            .btn-outline-accent {
                margin-left: 0;
                margin-top: 10px;
            }
            .hero-search-wrap {
                max-width: 100%;
            }
            .hero-quick-tags {
                gap: 8px;
            }
            .hero-quick-tags .quick-tag {
                font-size: 0.78rem;
                padding: 6px 12px;
            }
            .breadcrumb-row {
                padding: 12px 16px 0;
            }
        }

        @media (max-width: 576px) {
            .hero-category h1 {
                font-size: 1.6rem;
            }
            .hero-category .hero-subtitle {
                font-size: 0.88rem;
            }
            .section-header h2 {
                font-size: 1.35rem;
            }
            .steps-flow {
                flex-direction: column;
                align-items: stretch;
            }
            .step-card {
                max-width: none;
                flex: auto;
            }
            .track-card {
                flex: 0 0 200px;
                min-height: 210px;
            }
            .feature-item-dual {
                flex-direction: column;
                align-items: flex-start;
                gap: 10px;
            }
            .site-footer {
                grid-template-columns: 1fr;
                gap: 16px;
            }
            .site-footer .footer-brand {
                grid-column: auto;
            }
            .hero-search-wrap input {
                padding: 14px 46px 14px 16px;
                font-size: 0.88rem;
            }
            .hero-search-wrap .search-icon-btn {
                width: 34px;
                height: 34px;
                right: 5px;
            }
        }

/* roulang page: category2 */
:root {
            --bg-deep: #0B0C10;
            --bg-panel: #121212;
            --bg-card: rgba(255, 255, 255, 0.04);
            --bg-card-hover: rgba(255, 255, 255, 0.08);
            --bg-nav: #121212;
            --bg-section-alt: #1A1C2E;
            --text-primary: #F1F5F9;
            --text-secondary: #CBD5E1;
            --text-muted: #9CA3AF;
            --text-weak: #6B7280;
            --accent: #00E5A1;
            --accent-hover: #00C98A;
            --accent-glow: rgba(0, 229, 161, 0.5);
            --accent-subtle: rgba(0, 229, 161, 0.1);
            --border-subtle: rgba(255, 255, 255, 0.08);
            --border-card: rgba(255, 255, 255, 0.08);
            --border-active: rgba(255, 255, 255, 0.15);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-xl: 24px;
            --radius-btn: 30px;
            --shadow-card: 0 4px 16px rgba(0, 0, 0, 0.3);
            --shadow-hover: 0 12px 28px rgba(0, 0, 0, 0.55);
            --shadow-glow: 0 0 20px rgba(0, 229, 161, 0.4);
            --nav-width: 240px;
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
            --font-hero: 44px;
            --font-section: 30px;
            --font-card-title: 18px;
            --font-body: 16px;
            --font-small: 14px;
            --font-xs: 12px;
            --line-height-body: 1.75;
        }

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

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

        body {
            margin: 0;
            padding: 0;
            font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", "Noto Sans SC", sans-serif;
            font-size: var(--font-body);
            line-height: var(--line-height-body);
            color: var(--text-primary);
            background-color: var(--bg-deep);
            display: flex;
            min-height: 100vh;
            overflow-x: hidden;
        }

        a {
            color: var(--accent);
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        a:hover {
            color: var(--accent-hover);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        button {
            cursor: pointer;
            font-family: inherit;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            margin-top: 0;
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }
        p {
            margin-top: 0;
            margin-bottom: 1em;
        }
        ul,
        ol {
            padding-left: 1.2em;
        }

        .desktop-sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background-color: var(--bg-nav);
            border-right: 1px solid var(--border-subtle);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            overflow-y: auto;
            flex-shrink: 0;
        }
        .sidebar-brand {
            padding: 28px 24px 20px;
            border-bottom: 1px solid var(--border-subtle);
            flex-shrink: 0;
        }
        .sidebar-brand .brand-name {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.02em;
            display: block;
        }
        .sidebar-brand .brand-tagline {
            font-size: var(--font-xs);
            color: var(--text-muted);
            margin-top: 4px;
            display: block;
        }
        .sidebar-nav-list {
            list-style: none;
            margin: 0;
            padding: 16px 0;
            flex: 1;
        }
        .sidebar-nav-list li {
            margin: 0;
            padding: 0;
        }
        .sidebar-nav-list li a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 13px 24px;
            font-size: 15px;
            font-weight: 500;
            color: var(--text-secondary);
            text-decoration: none;
            border-left: 3px solid transparent;
            transition: all var(--transition-fast);
            letter-spacing: 0.02em;
        }
        .sidebar-nav-list li a:hover {
            color: var(--text-primary);
            background-color: rgba(255, 255, 255, 0.03);
            border-left-color: rgba(0, 229, 161, 0.4);
        }
        .sidebar-nav-list li a.active {
            color: var(--accent);
            background-color: rgba(0, 229, 161, 0.06);
            border-left-color: var(--accent);
            font-weight: 600;
        }
        .sidebar-nav-list li a i {
            width: 18px;
            text-align: center;
            font-size: 14px;
            opacity: 0.8;
        }
        .sidebar-footer-hint {
            padding: 16px 24px;
            border-top: 1px solid var(--border-subtle);
            font-size: var(--font-xs);
            color: var(--text-weak);
            flex-shrink: 0;
        }

        .mobile-top-nav {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 56px;
            background-color: var(--bg-nav);
            border-bottom: 1px solid var(--border-subtle);
            z-index: 1050;
            align-items: center;
            justify-content: space-between;
            padding: 0 16px;
        }
        .mobile-brand-text {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
        }
        .hamburger-btn {
            background: none;
            border: none;
            color: var(--text-primary);
            font-size: 22px;
            padding: 8px;
            line-height: 1;
            transition: color var(--transition-fast);
        }
        .hamburger-btn:hover {
            color: var(--accent);
        }
        .mobile-menu-overlay {
            display: none;
            position: fixed;
            top: 56px;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: rgba(11, 12, 16, 0.97);
            z-index: 1049;
            flex-direction: column;
            padding: 20px;
            overflow-y: auto;
        }
        .mobile-menu-overlay.show {
            display: flex;
        }
        .mobile-menu-overlay a {
            display: block;
            padding: 14px 8px;
            font-size: 17px;
            font-weight: 500;
            color: var(--text-secondary);
            border-bottom: 1px solid var(--border-subtle);
            text-decoration: none;
            transition: color var(--transition-fast);
        }
        .mobile-menu-overlay a:hover,
        .mobile-menu-overlay a.active {
            color: var(--accent);
        }

        .main-content {
            margin-left: var(--nav-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            width: calc(100% - var(--nav-width));
        }

        .hero-section {
            position: relative;
            background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
            min-height: 520px;
            display: flex;
            align-items: center;
            overflow: hidden;
        }
        .hero-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(11, 12, 16, 0.88) 0%, rgba(11, 12, 16, 0.7) 50%, rgba(26, 28, 46, 0.75) 100%);
            z-index: 1;
        }
        .hero-inner {
            position: relative;
            z-index: 2;
            padding: 60px 48px;
            display: flex;
            align-items: center;
            gap: 48px;
            max-width: 1200px;
            width: 100%;
        }
        .hero-text-col {
            flex: 1;
            min-width: 0;
        }
        .hero-badge-row {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            margin-bottom: 20px;
        }
        .hero-stat-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 229, 161, 0.1);
            border: 1px solid rgba(0, 229, 161, 0.25);
            border-radius: var(--radius-btn);
            padding: 8px 18px;
            font-size: var(--font-small);
            color: var(--accent);
            font-weight: 600;
            white-space: nowrap;
        }
        .hero-stat-badge i {
            font-size: 13px;
        }
        .hero-title {
            font-size: var(--font-hero);
            font-weight: 700;
            color: #FFFFFF;
            margin-bottom: 16px;
            letter-spacing: 0.03em;
            line-height: 1.2;
        }
        .hero-title span {
            color: var(--accent);
        }
        .hero-subtitle {
            font-size: 18px;
            color: var(--text-secondary);
            margin-bottom: 28px;
            max-width: 560px;
            line-height: 1.6;
        }
        .hero-cta-row {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }
        .btn-primary-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: var(--accent);
            color: #000;
            font-weight: 600;
            font-size: 15px;
            padding: 13px 28px;
            border-radius: var(--radius-btn);
            border: none;
            text-decoration: none;
            transition: all var(--transition-smooth);
            letter-spacing: 0.02em;
            white-space: nowrap;
        }
        .btn-primary-custom:hover {
            background: var(--accent-hover);
            color: #000;
            box-shadow: var(--shadow-glow);
            transform: translateY(-2px);
        }
        .btn-outline-custom {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--accent);
            font-weight: 600;
            font-size: 15px;
            padding: 13px 28px;
            border-radius: var(--radius-btn);
            border: 2px solid var(--accent);
            text-decoration: none;
            transition: all var(--transition-smooth);
            letter-spacing: 0.02em;
            white-space: nowrap;
        }
        .btn-outline-custom:hover {
            background: var(--accent-subtle);
            color: var(--accent);
            box-shadow: 0 0 12px rgba(0, 229, 161, 0.25);
            transform: translateY(-2px);
        }
        .hero-visual-col {
            flex: 0 0 420px;
            display: flex;
            flex-direction: column;
            gap: 16px;
            align-items: flex-end;
        }
        .hero-metric-card {
            background: rgba(18, 18, 18, 0.85);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            text-align: center;
            min-width: 160px;
        }
        .hero-metric-value {
            font-size: 32px;
            font-weight: 700;
            color: var(--accent);
            letter-spacing: 0.03em;
        }
        .hero-metric-label {
            font-size: var(--font-xs);
            color: var(--text-muted);
            margin-top: 4px;
        }
        .hero-metric-row {
            display: flex;
            gap: 14px;
            flex-wrap: wrap;
        }

        .section-block {
            padding: 64px 48px;
            max-width: 1200px;
            width: 100%;
        }
        .section-block.alt-bg {
            background-color: var(--bg-section-alt);
            max-width: 100%;
            padding-left: 48px;
            padding-right: 48px;
        }
        .section-header {
            margin-bottom: 36px;
        }
        .section-label {
            display: inline-block;
            font-size: var(--font-xs);
            font-weight: 600;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.08em;
            margin-bottom: 8px;
        }
        .section-title {
            font-size: var(--font-section);
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            letter-spacing: 0.02em;
        }
        .section-desc {
            font-size: var(--font-body);
            color: var(--text-muted);
            max-width: 640px;
            line-height: 1.6;
        }

        .horizontal-track-wrapper {
            position: relative;
            overflow-x: auto;
            overflow-y: visible;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
            padding-bottom: 8px;
            margin: 0 -4px;
            scrollbar-width: thin;
            scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
        }
        .horizontal-track-wrapper::-webkit-scrollbar {
            height: 5px;
        }
        .horizontal-track-wrapper::-webkit-scrollbar-track {
            background: transparent;
        }
        .horizontal-track-wrapper::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.15);
            border-radius: 10px;
        }
        .horizontal-track {
            display: flex;
            gap: 16px;
            padding: 4px;
        }
        .track-card {
            flex: 0 0 300px;
            min-width: 280px;
            scroll-snap-align: start;
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-smooth);
            cursor: default;
            position: relative;
        }
        .track-card:hover {
            background: var(--bg-card-hover);
            transform: translateY(-6px) scale(1.02);
            box-shadow: var(--shadow-hover);
            border-color: var(--border-active);
        }
        .track-card-img-wrap {
            position: relative;
            width: 100%;
            height: 180px;
            overflow: hidden;
            background-color: #1a1c2e;
        }
        .track-card-img-wrap img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-smooth);
        }
        .track-card:hover .track-card-img-wrap img {
            transform: scale(1.06);
        }
        .track-card-body {
            padding: 18px 20px 20px;
            position: relative;
        }
        .track-card-body h4 {
            font-size: var(--font-card-title);
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 6px;
        }
        .track-card-body p {
            font-size: var(--font-small);
            color: var(--text-muted);
            margin-bottom: 0;
            line-height: 1.5;
        }
        .track-card-badge {
            display: inline-block;
            font-size: 11px;
            font-weight: 600;
            color: var(--accent);
            background: var(--accent-subtle);
            padding: 4px 10px;
            border-radius: 20px;
            margin-bottom: 8px;
            letter-spacing: 0.04em;
        }
        .track-card-info-layer {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(transparent, rgba(0, 0, 0, 0.85));
            padding: 40px 20px 14px;
            pointer-events: none;
        }
        .track-card-info-layer h4 {
            color: #fff;
            font-size: 16px;
            margin-bottom: 2px;
        }
        .track-card-info-layer span {
            font-size: var(--font-xs);
            color: var(--text-muted);
        }
        .track-card.overlay-style .track-card-body {
            display: none;
        }
        .track-card.overlay-style .track-card-info-layer {
            display: block;
        }
        .track-card:not(.overlay-style) .track-card-info-layer {
            display: none;
        }

        .process-steps-row {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            counter-reset: step;
        }
        .process-step-card {
            flex: 1 1 220px;
            min-width: 200px;
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-lg);
            padding: 28px 22px 22px;
            position: relative;
            transition: all var(--transition-smooth);
            text-align: center;
        }
        .process-step-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--border-active);
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .process-step-number {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--accent);
            color: #000;
            font-weight: 700;
            font-size: 18px;
            margin-bottom: 14px;
        }
        .process-step-card h4 {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 6px;
        }
        .process-step-card p {
            font-size: var(--font-small);
            color: var(--text-muted);
            margin-bottom: 0;
            line-height: 1.5;
        }

        .compare-table-wrap {
            overflow-x: auto;
            border-radius: var(--radius-lg);
            border: 1px solid var(--border-subtle);
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 600px;
            font-size: var(--font-small);
        }
        .compare-table thead th {
            background: var(--bg-section-alt);
            color: var(--text-primary);
            font-weight: 600;
            padding: 16px 20px;
            text-align: left;
            border-bottom: 1px solid var(--border-subtle);
            white-space: nowrap;
        }
        .compare-table tbody td {
            padding: 14px 20px;
            border-bottom: 1px solid var(--border-subtle);
            color: var(--text-secondary);
            vertical-align: top;
        }
        .compare-table tbody tr:hover td {
            background: rgba(255, 255, 255, 0.02);
        }
        .compare-table .check-icon {
            color: var(--accent);
            font-weight: 700;
        }
        .compare-table .dim-icon {
            color: var(--text-weak);
        }

        .accordion-custom .accordion-item {
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: var(--radius-md) !important;
            margin-bottom: 10px;
            overflow: hidden;
        }
        .accordion-custom .accordion-header button {
            background: rgba(255, 255, 255, 0.03);
            color: var(--text-primary);
            font-weight: 600;
            font-size: 15px;
            padding: 18px 20px;
            border: none;
            box-shadow: none;
            border-radius: var(--radius-md) !important;
            transition: all var(--transition-fast);
            width: 100%;
            text-align: left;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .accordion-custom .accordion-header button:not(.collapsed) {
            background: rgba(0, 229, 161, 0.06);
            border-left: 3px solid var(--accent);
            color: var(--accent);
        }
        .accordion-custom .accordion-header button:focus {
            box-shadow: none;
            outline: none;
        }
        .accordion-custom .accordion-body {
            padding: 18px 20px;
            color: var(--text-secondary);
            font-size: var(--font-small);
            line-height: 1.7;
            background: rgba(255, 255, 255, 0.015);
        }
        .accordion-custom .accordion-button::after {
            filter: brightness(0) invert(0.8);
        }

        .cta-section {
            background: url('/assets/images/backpic/back-3.webp') center/cover no-repeat;
            position: relative;
            border-radius: var(--radius-xl);
            overflow: hidden;
            margin: 0 48px 48px;
            max-width: 1104px;
        }
        .cta-overlay {
            background: linear-gradient(135deg, rgba(11, 12, 16, 0.9) 0%, rgba(26, 28, 46, 0.85) 100%);
            padding: 56px 40px;
            text-align: center;
        }
        .cta-overlay h3 {
            font-size: 28px;
            font-weight: 700;
            color: #fff;
            margin-bottom: 12px;
        }
        .cta-overlay p {
            color: var(--text-secondary);
            font-size: var(--font-body);
            margin-bottom: 24px;
            max-width: 500px;
            margin-left: auto;
            margin-right: auto;
        }
        .cta-overlay .btn-primary-custom {
            font-size: 16px;
            padding: 15px 36px;
        }

        .site-footer {
            background-color: var(--bg-panel);
            border-top: 1px solid var(--border-subtle);
            padding: 40px 48px 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 32px;
            justify-content: space-between;
            flex-shrink: 0;
        }
        .footer-brand {
            flex: 1 1 260px;
            min-width: 200px;
        }
        .footer-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 8px;
            letter-spacing: 0.02em;
        }
        .footer-brand p {
            font-size: var(--font-small);
            color: var(--text-muted);
            line-height: 1.6;
            margin-bottom: 0;
        }
        .footer-col {
            flex: 0 0 auto;
            min-width: 130px;
        }
        .footer-col h5 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-secondary);
            margin-bottom: 10px;
            letter-spacing: 0.03em;
        }
        .footer-col a {
            display: block;
            font-size: var(--font-small);
            color: var(--text-muted);
            text-decoration: none;
            padding: 4px 0;
            transition: color var(--transition-fast);
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            width: 100%;
            text-align: center;
            font-size: var(--font-xs);
            color: var(--text-weak);
            padding-top: 16px;
            border-top: 1px solid var(--border-subtle);
            margin-top: 8px;
        }

        @media (max-width: 991px) {
            .desktop-sidebar {
                display: none;
            }
            .mobile-top-nav {
                display: flex;
            }
            .main-content {
                margin-left: 0;
                width: 100%;
                padding-top: 56px;
            }
            .hero-section {
                min-height: auto;
            }
            .hero-inner {
                flex-direction: column;
                padding: 40px 20px;
                gap: 28px;
            }
            .hero-visual-col {
                flex: 0 0 auto;
                width: 100%;
                flex-direction: row;
                flex-wrap: wrap;
                justify-content: center;
            }
            .hero-title {
                font-size: 30px;
            }
            .hero-subtitle {
                font-size: 16px;
            }
            .section-block {
                padding: 40px 20px;
            }
            .section-block.alt-bg {
                padding-left: 20px;
                padding-right: 20px;
            }
            .section-title {
                font-size: 24px;
            }
            .track-card {
                flex: 0 0 240px;
                min-width: 220px;
            }
            .cta-section {
                margin: 0 20px 32px;
            }
            .cta-overlay {
                padding: 36px 20px;
            }
            .cta-overlay h3 {
                font-size: 22px;
            }
            .site-footer {
                padding: 28px 20px 20px;
                gap: 20px;
            }
            .hero-metric-card {
                min-width: 120px;
                padding: 14px 16px;
            }
            .hero-metric-value {
                font-size: 24px;
            }
            .process-steps-row {
                gap: 12px;
            }
            .process-step-card {
                flex: 1 1 150px;
                min-width: 150px;
            }
        }
        @media (max-width: 575px) {
            .hero-inner {
                padding: 28px 14px;
                gap: 18px;
            }
            .hero-title {
                font-size: 24px;
            }
            .hero-subtitle {
                font-size: 14px;
            }
            .hero-cta-row {
                flex-direction: column;
                gap: 10px;
            }
            .btn-primary-custom,
            .btn-outline-custom {
                width: 100%;
                justify-content: center;
                font-size: 14px;
                padding: 12px 20px;
            }
            .hero-badge-row {
                gap: 8px;
            }
            .hero-stat-badge {
                font-size: 11px;
                padding: 6px 12px;
            }
            .section-block {
                padding: 28px 14px;
            }
            .section-block.alt-bg {
                padding-left: 14px;
                padding-right: 14px;
            }
            .section-title {
                font-size: 20px;
            }
            .track-card {
                flex: 0 0 200px;
                min-width: 180px;
            }
            .track-card-img-wrap {
                height: 130px;
            }
            .hero-visual-col {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-metric-row {
                flex-direction: row;
                justify-content: center;
            }
            .hero-metric-card {
                flex: 1;
                min-width: 90px;
            }
            .process-step-card {
                flex: 1 1 130px;
                min-width: 130px;
                padding: 18px 12px 14px;
            }
            .compare-table thead th,
            .compare-table tbody td {
                padding: 10px 12px;
                font-size: 12px;
            }
            .footer-col {
                flex: 1 1 120px;
            }
        }

/* roulang page: article */
:root {
            --bg-deep: #0B0C10;
            --bg-surface: #121212;
            --bg-card: rgba(255,255,255,0.04);
            --bg-card-hover: rgba(255,255,255,0.08);
            --bg-nav: #121212;
            --bg-dark-card: #1A1C2E;
            --accent: #00E5A1;
            --accent-hover: #00C98A;
            --accent-glow: rgba(0,229,161,0.5);
            --text-primary: #E5E7EB;
            --text-secondary: #9CA3AF;
            --text-muted: #6B7280;
            --border-subtle: rgba(255,255,255,0.08);
            --border-medium: rgba(255,255,255,0.12);
            --radius-lg: 16px;
            --radius-md: 12px;
            --radius-sm: 8px;
            --radius-pill: 30px;
            --shadow-card: 0 4px 16px rgba(0,0,0,0.3);
            --shadow-card-hover: 0 12px 24px rgba(0,0,0,0.5);
            --shadow-glow: 0 0 16px rgba(0,229,161,0.5);
            --transition-fast: 0.2s ease;
            --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --nav-width: 240px;
            --font-hero: 48px;
            --font-section: 32px;
            --font-card-title: 18px;
            --font-body: 16px;
            --font-small: 14px;
            --line-height-body: 1.8;
        }

        *, *::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: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
            font-size: var(--font-body);
            line-height: 1.7;
            color: var(--text-primary);
            background-color: var(--bg-deep);
            min-height: 100vh;
            overflow-x: hidden;
        }

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button {
            cursor: pointer;
            border: none;
            background: none;
            font-family: inherit;
        }
        button:focus-visible {
            outline: 2px solid var(--accent);
            outline-offset: 2px;
            border-radius: 4px;
        }

        input {
            font-family: inherit;
        }

        .app-layout {
            display: flex;
            min-height: 100vh;
        }

        /* ========== 左侧导航 - 桌面端 ========== */
        .side-nav {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--nav-width);
            height: 100vh;
            background-color: var(--bg-nav);
            border-right: 1px solid var(--border-subtle);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            overflow-y: auto;
            flex-shrink: 0;
        }

        .side-nav-brand {
            padding: 24px 20px 20px;
            border-bottom: 1px solid var(--border-subtle);
        }
        .side-nav-brand .brand-name {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.5px;
            display: block;
            line-height: 1.3;
        }
        .side-nav-brand .brand-sub {
            font-size: 11px;
            color: var(--text-muted);
            letter-spacing: 1px;
            text-transform: uppercase;
            margin-top: 2px;
        }

        .side-nav-menu {
            list-style: none;
            padding: 16px 0;
            flex: 1;
        }
        .side-nav-menu li {
            margin: 2px 0;
        }
        .side-nav-menu li a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 11px 20px;
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            border-left: 3px solid transparent;
            transition: all var(--transition-fast);
            text-decoration: none;
            letter-spacing: 0.3px;
        }
        .side-nav-menu li a:hover {
            color: var(--text-primary);
            background-color: rgba(255,255,255,0.03);
            border-left-color: rgba(0,229,161,0.4);
        }
        .side-nav-menu li a.active {
            color: var(--accent);
            background-color: rgba(0,229,161,0.06);
            border-left-color: var(--accent);
            font-weight: 600;
        }
        .side-nav-menu li a i {
            width: 18px;
            text-align: center;
            font-size: 14px;
            opacity: 0.8;
        }

        .side-nav-footer {
            padding: 16px 20px;
            border-top: 1px solid var(--border-subtle);
            font-size: 11px;
            color: var(--text-muted);
            letter-spacing: 0.5px;
        }

        /* ========== 移动端顶部导航 ========== */
        .mobile-top-nav {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: 56px;
            background-color: var(--bg-nav);
            border-bottom: 1px solid var(--border-subtle);
            z-index: 1001;
            align-items: center;
            justify-content: space-between;
            padding: 0 16px;
        }
        .mobile-brand-text {
            font-size: 17px;
            font-weight: 700;
            color: var(--text-primary);
            letter-spacing: 0.5px;
        }
        .hamburger-btn {
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-primary);
            font-size: 22px;
            border-radius: var(--radius-sm);
            transition: background var(--transition-fast);
        }
        .hamburger-btn:hover {
            background-color: rgba(255,255,255,0.06);
        }

        .mobile-menu-panel {
            display: none;
            position: fixed;
            top: 56px;
            left: 0;
            right: 0;
            background-color: var(--bg-nav);
            border-bottom: 1px solid var(--border-subtle);
            z-index: 1000;
            padding: 8px 0;
            box-shadow: 0 8px 24px rgba(0,0,0,0.6);
        }
        .mobile-menu-panel.open {
            display: block;
        }
        .mobile-menu-panel a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 13px 20px;
            color: var(--text-secondary);
            font-size: 15px;
            font-weight: 500;
            text-decoration: none;
            border-left: 3px solid transparent;
            transition: all var(--transition-fast);
        }
        .mobile-menu-panel a:hover,
        .mobile-menu-panel a.active {
            color: var(--accent);
            background-color: rgba(0,229,161,0.05);
            border-left-color: var(--accent);
        }
        .mobile-menu-panel a i {
            width: 18px;
            text-align: center;
            font-size: 14px;
            opacity: 0.8;
        }

        /* ========== 主内容区 ========== */
        .main-content {
            margin-left: var(--nav-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            padding-top: 0;
        }

        .content-inner {
            flex: 1;
            padding: 32px 40px 60px;
            max-width: 1100px;
            width: 100%;
            margin: 0 auto;
        }

        /* ========== 面包屑 ========== */
        .breadcrumb-custom {
            display: flex;
            align-items: center;
            flex-wrap: wrap;
            gap: 6px;
            font-size: var(--font-small);
            color: var(--text-muted);
            margin-bottom: 28px;
            padding: 0;
            list-style: none;
        }
        .breadcrumb-custom a {
            color: var(--text-secondary);
            text-decoration: none;
            transition: color var(--transition-fast);
            white-space: nowrap;
        }
        .breadcrumb-custom a:hover {
            color: var(--accent);
        }
        .breadcrumb-custom .separator {
            color: var(--text-muted);
            margin: 0 4px;
            user-select: none;
        }
        .breadcrumb-custom .current {
            color: var(--text-primary);
            font-weight: 500;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            max-width: 300px;
        }

        /* ========== 文章标题区域 ========== */
        .article-header {
            margin-bottom: 32px;
        }
        .article-header h1 {
            font-size: 34px;
            font-weight: 700;
            line-height: 1.35;
            color: var(--text-primary);
            margin-bottom: 16px;
            letter-spacing: 0.3px;
        }
        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px;
            font-size: var(--font-small);
            color: var(--text-muted);
        }
        .article-meta .meta-item {
            display: flex;
            align-items: center;
            gap: 5px;
        }
        .article-meta .meta-item i {
            font-size: 13px;
            opacity: 0.7;
        }
        .article-meta .category-tag {
            display: inline-block;
            padding: 4px 12px;
            background-color: rgba(0,229,161,0.1);
            color: var(--accent);
            border-radius: 20px;
            font-size: 12px;
            font-weight: 500;
            letter-spacing: 0.4px;
            white-space: nowrap;
        }
        .article-divider {
            border: none;
            height: 1px;
            background: var(--border-subtle);
            margin: 24px 0 32px;
        }

        /* ========== 文章正文 ========== */
        .article-body-wrapper {
            max-width: 800px;
            margin: 0 auto;
        }
        .article-body {
            font-size: var(--font-body);
            line-height: var(--line-height-body);
            color: var(--text-primary);
        }
        .article-body h2 {
            font-size: 26px;
            font-weight: 700;
            color: var(--text-primary);
            margin: 40px 0 16px;
            padding-bottom: 8px;
            border-bottom: 1px solid var(--border-subtle);
            line-height: 1.4;
        }
        .article-body h3 {
            font-size: 20px;
            font-weight: 600;
            color: var(--text-primary);
            margin: 28px 0 12px;
            line-height: 1.4;
        }
        .article-body h4 {
            font-size: 17px;
            font-weight: 600;
            color: var(--text-primary);
            margin: 22px 0 10px;
            line-height: 1.4;
        }
        .article-body p {
            margin-bottom: 18px;
            line-height: var(--line-height-body);
            color: var(--text-primary);
        }
        .article-body ul,
        .article-body ol {
            margin: 16px 0;
            padding-left: 24px;
            color: var(--text-primary);
        }
        .article-body li {
            margin-bottom: 8px;
            line-height: 1.7;
        }
        .article-body blockquote {
            margin: 24px 0;
            padding: 16px 20px;
            border-left: 3px solid var(--accent);
            background-color: rgba(0,229,161,0.04);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-secondary);
            font-style: italic;
            line-height: 1.7;
        }
        .article-body img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-medium);
            box-shadow: 0 8px 24px rgba(0,0,0,0.4);
            margin: 24px 0;
        }
        .article-body pre {
            background-color: #1a1d28;
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 20px 24px;
            overflow-x: auto;
            font-family: "SF Mono", "Fira Code", "Consolas", monospace;
            font-size: 14px;
            line-height: 1.6;
            color: #d4d4d4;
            margin: 20px 0;
        }
        .article-body code {
            background-color: rgba(255,255,255,0.06);
            padding: 2px 8px;
            border-radius: 4px;
            font-family: "SF Mono", "Fira Code", "Consolas", monospace;
            font-size: 14px;
            color: var(--accent);
        }
        .article-body pre code {
            background: none;
            padding: 0;
            border-radius: 0;
            color: #d4d4d4;
            font-size: 14px;
        }

        /* ========== 内容未找到 ========== */
        .not-found-state {
            text-align: center;
            padding: 60px 20px;
        }
        .not-found-state .nf-icon {
            font-size: 64px;
            color: var(--text-muted);
            margin-bottom: 20px;
            opacity: 0.6;
        }
        .not-found-state h2 {
            font-size: 24px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 12px;
        }
        .not-found-state p {
            color: var(--text-secondary);
            margin-bottom: 24px;
            font-size: var(--font-body);
        }

        /* ========== 按钮 ========== */
        .btn-accent {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background-color: var(--accent);
            color: #000;
            font-weight: 600;
            font-size: 15px;
            padding: 11px 28px;
            border-radius: var(--radius-pill);
            border: none;
            cursor: pointer;
            transition: all var(--transition-smooth);
            text-decoration: none;
            letter-spacing: 0.4px;
        }
        .btn-accent:hover {
            background-color: var(--accent-hover);
            box-shadow: var(--shadow-glow);
            color: #000;
            transform: translateY(-1px);
        }
        .btn-accent:active {
            transform: translateY(0);
            box-shadow: none;
        }

        .btn-outline-accent {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: transparent;
            color: var(--accent);
            font-weight: 600;
            font-size: 15px;
            padding: 10px 28px;
            border-radius: var(--radius-pill);
            border: 2px solid var(--accent);
            cursor: pointer;
            transition: all var(--transition-smooth);
            text-decoration: none;
            letter-spacing: 0.4px;
        }
        .btn-outline-accent:hover {
            background-color: rgba(0,229,161,0.1);
            box-shadow: 0 0 12px rgba(0,229,161,0.25);
            color: var(--accent);
        }
        .btn-outline-accent:active {
            background-color: rgba(0,229,161,0.18);
        }

        .btn-back {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: transparent;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 15px;
            padding: 10px 20px;
            border-radius: var(--radius-pill);
            border: 1px solid var(--border-medium);
            cursor: pointer;
            transition: all var(--transition-fast);
            text-decoration: none;
        }
        .btn-back:hover {
            color: var(--text-primary);
            border-color: var(--text-muted);
            background-color: rgba(255,255,255,0.03);
        }

        /* ========== 相关推荐 ========== */
        .related-section {
            margin-top: 56px;
            padding-top: 32px;
            border-top: 1px solid var(--border-subtle);
        }
        .related-section .section-label {
            font-size: 22px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 20px;
            letter-spacing: 0.3px;
        }
        .related-track {
            display: flex;
            gap: 16px;
            overflow-x: auto;
            scroll-snap-type: x mandatory;
            -webkit-overflow-scrolling: touch;
            padding-bottom: 8px;
            scrollbar-width: thin;
            scrollbar-color: rgba(255,255,255,0.15) transparent;
        }
        .related-track::-webkit-scrollbar {
            height: 5px;
        }
        .related-track::-webkit-scrollbar-track {
            background: transparent;
        }
        .related-track::-webkit-scrollbar-thumb {
            background: rgba(255,255,255,0.15);
            border-radius: 10px;
        }
        .related-track::-webkit-scrollbar-thumb:hover {
            background: rgba(255,255,255,0.25);
        }

        .related-card {
            flex: 0 0 280px;
            min-width: 280px;
            scroll-snap-align: start;
            background: var(--bg-card);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            overflow: hidden;
            transition: all var(--transition-smooth);
            cursor: pointer;
            text-decoration: none;
            display: flex;
            flex-direction: column;
        }
        .related-card:hover {
            background: var(--bg-card-hover);
            transform: translateY(-4px);
            box-shadow: var(--shadow-card-hover);
            border-color: var(--border-medium);
        }
        .related-card .card-thumb {
            position: relative;
            width: 100%;
            aspect-ratio: 16 / 9;
            overflow: hidden;
            background-color: #1a1d28;
        }
        .related-card .card-thumb img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform var(--transition-smooth);
        }
        .related-card:hover .card-thumb img {
            transform: scale(1.06);
        }
        .related-card .card-thumb .thumb-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 50%;
            background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
            pointer-events: none;
        }
        .related-card .card-info {
            padding: 16px 18px 18px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .related-card .card-tag {
            display: inline-block;
            font-size: 11px;
            font-weight: 600;
            color: var(--accent);
            background-color: rgba(0,229,161,0.1);
            padding: 3px 10px;
            border-radius: 12px;
            letter-spacing: 0.5px;
            margin-bottom: 8px;
            align-self: flex-start;
        }
        .related-card .card-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--text-primary);
            line-height: 1.45;
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
        }
        .related-card .card-date {
            font-size: 12px;
            color: var(--text-muted);
            margin-top: auto;
        }

        /* ========== 文章底部操作区 ========== */
        .article-bottom-actions {
            margin-top: 40px;
            padding-top: 28px;
            border-top: 1px solid var(--border-subtle);
            display: flex;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        /* ========== 页脚 ========== */
        .site-footer {
            background-color: var(--bg-surface);
            border-top: 1px solid var(--border-subtle);
            padding: 48px 40px 24px;
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 32px;
            margin-top: auto;
        }
        .footer-brand .footer-logo {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 10px;
            letter-spacing: 0.5px;
        }
        .footer-brand p {
            font-size: var(--font-small);
            color: var(--text-muted);
            line-height: 1.6;
            max-width: 320px;
        }
        .footer-col h5 {
            font-size: 14px;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 14px;
            letter-spacing: 0.5px;
            text-transform: uppercase;
        }
        .footer-col a {
            display: block;
            font-size: var(--font-small);
            color: var(--text-secondary);
            text-decoration: none;
            margin-bottom: 8px;
            transition: color var(--transition-fast);
        }
        .footer-col a:hover {
            color: var(--accent);
        }
        .footer-bottom {
            grid-column: 1 / -1;
            border-top: 1px solid var(--border-subtle);
            padding-top: 18px;
            font-size: 12px;
            color: var(--text-muted);
            text-align: center;
            letter-spacing: 0.4px;
        }

        /* ========== 响应式 ========== */
        @media (max-width: 991.98px) {
            .side-nav {
                display: none;
            }
            .mobile-top-nav {
                display: flex;
            }
            .main-content {
                margin-left: 0;
                padding-top: 56px;
            }
            .content-inner {
                padding: 24px 20px 48px;
                max-width: 100%;
            }
            .article-header h1 {
                font-size: 26px;
            }
            .article-body {
                font-size: 15px;
            }
            .article-body h2 {
                font-size: 22px;
            }
            .article-body h3 {
                font-size: 18px;
            }
            .related-card {
                flex: 0 0 240px;
                min-width: 240px;
            }
            .site-footer {
                grid-template-columns: 1fr 1fr;
                padding: 36px 20px 20px;
                gap: 24px;
            }
            .footer-brand {
                grid-column: 1 / -1;
            }
            .breadcrumb-custom .current {
                max-width: 180px;
            }
        }

        @media (max-width: 767.98px) {
            .content-inner {
                padding: 20px 16px 40px;
            }
            .article-header h1 {
                font-size: 22px;
            }
            .article-meta {
                gap: 10px;
                font-size: 12px;
            }
            .article-body {
                font-size: 15px;
                line-height: 1.75;
            }
            .article-body h2 {
                font-size: 20px;
                margin: 28px 0 12px;
            }
            .article-body h3 {
                font-size: 17px;
            }
            .related-card {
                flex: 0 0 220px;
                min-width: 220px;
            }
            .related-track {
                gap: 12px;
            }
            .site-footer {
                grid-template-columns: 1fr;
                padding: 32px 16px 20px;
                gap: 20px;
            }
            .footer-col {
                margin-bottom: 4px;
            }
            .btn-accent,
            .btn-outline-accent {
                padding: 10px 22px;
                font-size: 14px;
            }
            .article-bottom-actions {
                flex-direction: column;
                align-items: center;
                gap: 12px;
            }
            .breadcrumb-custom {
                font-size: 12px;
                margin-bottom: 20px;
            }
            .breadcrumb-custom .current {
                max-width: 140px;
            }
        }

        @media (max-width: 520px) {
            .article-header h1 {
                font-size: 20px;
            }
            .article-body {
                font-size: 14px;
                line-height: 1.7;
            }
            .article-body h2 {
                font-size: 18px;
            }
            .related-card {
                flex: 0 0 200px;
                min-width: 200px;
            }
            .related-card .card-title {
                font-size: 13px;
            }
            .related-card .card-info {
                padding: 12px 14px 14px;
            }
            .content-inner {
                padding: 16px 12px 32px;
            }
        }