/* roulang page: index */
/* ===== Design Variables ===== */
        :root {
            --primary: #1a3a5c;
            --primary-light: #2a5a8c;
            --primary-dark: #0f2440;
            --accent: #e8a838;
            --accent-light: #f0c060;
            --accent-dark: #c88a20;
            --bg: #f7f8fa;
            --bg-white: #ffffff;
            --bg-dark: #0f1a2e;
            --text: #1a1a2e;
            --text-light: #5a6a7e;
            --text-white: #f0f2f5;
            --border: #dce0e8;
            --shadow: 0 4px 20px rgba(0,0,0,0.06);
            --shadow-hover: 0 12px 40px rgba(0,0,0,0.12);
            --radius: 16px;
            --radius-sm: 10px;
            --radius-lg: 24px;
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --nav-width: 260px;
            --nav-collapsed: 0px;
        }

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

        /* ===== Container ===== */
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
        .container--wide { max-width: 1400px; }

        /* ===== Layout: Left Nav + Main ===== */
        .app-layout { display: flex; min-height: 100vh; }
        .app-sidebar {
            position: fixed; top: 0; left: 0; width: var(--nav-width); height: 100vh;
            background: var(--bg-dark); color: var(--text-white);
            display: flex; flex-direction: column; z-index: 1000;
            transition: transform var(--transition);
            overflow-y: auto;
        }
        .app-sidebar .logo-area {
            padding: 28px 20px 20px; border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .app-sidebar .logo-area a {
            display: flex; align-items: center; gap: 10px; color: var(--text-white);
            font-size: 18px; font-weight: 700; letter-spacing: 0.5px;
        }
        .app-sidebar .logo-area a i { color: var(--accent); font-size: 22px; }
        .app-sidebar .logo-area a span { background: linear-gradient(135deg, #fff 60%, var(--accent-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .app-sidebar .nav-list { flex: 1; padding: 20px 0; }
        .app-sidebar .nav-list li { padding: 0 12px; margin-bottom: 4px; }
        .app-sidebar .nav-list a {
            display: flex; align-items: center; gap: 14px; padding: 12px 16px;
            border-radius: var(--radius-sm); color: rgba(255,255,255,0.7); font-size: 15px;
            font-weight: 500; transition: all var(--transition);
        }
        .app-sidebar .nav-list a i { width: 20px; text-align: center; font-size: 16px; }
        .app-sidebar .nav-list a:hover { background: rgba(255,255,255,0.08); color: #fff; }
        .app-sidebar .nav-list a.active { background: rgba(232,168,56,0.15); color: var(--accent); font-weight: 600; }
        .app-sidebar .sidebar-footer {
            padding: 20px; border-top: 1px solid rgba(255,255,255,0.06);
            font-size: 12px; color: rgba(255,255,255,0.35); text-align: center;
        }
        .app-main {
            margin-left: var(--nav-width); flex: 1; min-height: 100vh;
            transition: margin-left var(--transition);
        }

        /* ===== Mobile Nav Toggle ===== */
        .mobile-nav-toggle { display: none; position: fixed; top: 16px; left: 16px; z-index: 1100;
            background: var(--bg-white); border: none; width: 44px; height: 44px;
            border-radius: var(--radius-sm); box-shadow: var(--shadow);
            cursor: pointer; font-size: 20px; color: var(--primary); align-items: center; justify-content: center;
        }
        .mobile-nav-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.45); z-index: 999; }

        /* ===== Hero ===== */
        .hero {
            position: relative; min-height: 85vh; display: flex; align-items: center; justify-content: center;
            background: linear-gradient(135deg, rgba(15,26,46,0.85) 0%, rgba(26,58,92,0.7) 100%),
                        url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            color: var(--text-white); text-align: center; padding: 100px 24px 60px;
            overflow: hidden;
        }
        .hero::after {
            content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 120px;
            background: linear-gradient(transparent, var(--bg)); pointer-events: none;
        }
        .hero-content { position: relative; z-index: 2; max-width: 860px; }
        .hero-badge {
            display: inline-block; background: rgba(232,168,56,0.2); backdrop-filter: blur(6px);
            padding: 6px 20px; border-radius: 40px; font-size: 13px; letter-spacing: 1px;
            color: var(--accent-light); border: 1px solid rgba(232,168,56,0.25); margin-bottom: 24px;
        }
        .hero h1 {
            font-size: clamp(36px, 6vw, 72px); font-weight: 800; color: #fff;
            line-height: 1.15; margin-bottom: 20px; letter-spacing: -0.5px;
        }
        .hero h1 span { background: linear-gradient(135deg, var(--accent-light), #f5d080); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
        .hero p {
            font-size: clamp(16px, 2vw, 22px); color: rgba(255,255,255,0.8);
            max-width: 640px; margin: 0 auto 36px; line-height: 1.7;
        }
        .hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
        .btn {
            display: inline-flex; align-items: center; gap: 8px; padding: 14px 32px;
            border-radius: 50px; font-weight: 600; font-size: 15px; cursor: pointer;
            border: none; transition: all var(--transition); letter-spacing: 0.3px;
        }
        .btn--primary { background: var(--accent); color: var(--primary-dark); box-shadow: 0 4px 16px rgba(232,168,56,0.35); }
        .btn--primary:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(232,168,56,0.45); color: var(--primary-dark); }
        .btn--outline { background: transparent; color: #fff; border: 2px solid rgba(255,255,255,0.4); }
        .btn--outline:hover { background: rgba(255,255,255,0.1); border-color: #fff; transform: translateY(-2px); color: #fff; }
        .btn--white { background: #fff; color: var(--primary); box-shadow: 0 4px 16px rgba(0,0,0,0.08); }
        .btn--white:hover { background: var(--accent-light); color: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 8px 30px rgba(0,0,0,0.12); }

        /* ===== Section ===== */
        .section { padding: 80px 0; }
        .section--dark { background: var(--bg-dark); color: var(--text-white); }
        .section--dark h2, .section--dark h3 { color: #fff; }
        .section--gray { background: var(--bg); }
        .section-title { text-align: center; margin-bottom: 56px; }
        .section-title h2 {
            font-size: clamp(28px, 4vw, 40px); font-weight: 800; color: var(--primary-dark);
            margin-bottom: 12px; letter-spacing: -0.3px;
        }
        .section--dark .section-title h2 { color: #fff; }
        .section-title p {
            font-size: 17px; color: var(--text-light); max-width: 600px; margin: 0 auto;
            line-height: 1.7;
        }
        .section--dark .section-title p { color: rgba(255,255,255,0.7); }

        /* ===== Features / Cards Grid ===== */
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
        .card {
            background: var(--bg-white); border-radius: var(--radius); padding: 32px 28px;
            box-shadow: var(--shadow); transition: all var(--transition);
            border: 1px solid var(--border);
        }
        .card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
        .card__icon { width: 52px; height: 52px; border-radius: 14px; display: flex; align-items: center; justify-content: center; font-size: 22px; color: #fff; margin-bottom: 18px; }
        .card__icon--gold { background: linear-gradient(135deg, var(--accent), var(--accent-dark)); }
        .card__icon--blue { background: linear-gradient(135deg, var(--primary-light), var(--primary)); }
        .card__icon--teal { background: linear-gradient(135deg, #2a9d8f, #1a7a6e); }
        .card h3 { font-size: 20px; margin-bottom: 10px; color: var(--primary-dark); }
        .card p { color: var(--text-light); font-size: 15px; line-height: 1.7; }
        .card--dark { background: rgba(255,255,255,0.06); border-color: rgba(255,255,255,0.1); }
        .card--dark h3 { color: #fff; }
        .card--dark p { color: rgba(255,255,255,0.7); }

        /* ===== Steps / Timeline ===== */
        .steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; counter-reset: step; }
        .step { text-align: center; position: relative; padding: 0 12px; }
        .step::after {
            content: ''; position: absolute; top: 36px; left: 60%; right: -28%;
            height: 2px; background: linear-gradient(90deg, var(--accent), var(--border)); 
            pointer-events: none; display: none;
        }
        .step:last-child::after { display: none; }
        .step__num {
            width: 72px; height: 72px; border-radius: 50%; background: var(--primary);
            color: #fff; font-size: 28px; font-weight: 700; display: flex; align-items: center; justify-content: center;
            margin: 0 auto 20px; box-shadow: 0 4px 20px rgba(26,58,92,0.2);
        }
        .step h4 { font-size: 18px; margin-bottom: 8px; color: var(--primary-dark); }
        .step p { font-size: 14px; color: var(--text-light); line-height: 1.6; max-width: 260px; margin: 0 auto; }

        /* ===== CMS List ===== */
        .cms-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
        .cms-item {
            display: flex; gap: 16px; background: var(--bg-white); padding: 16px 20px;
            border-radius: var(--radius-sm); box-shadow: var(--shadow);
            transition: all var(--transition); border: 1px solid var(--border);
        }
        .cms-item:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
        .cms-item__thumb { width: 100px; min-height: 76px; border-radius: 8px; overflow: hidden; flex-shrink: 0; background: var(--border); }
        .cms-item__thumb img { width: 100%; height: 100%; object-fit: cover; }
        .cms-item__body { flex: 1; }
        .cms-item__body h4 { font-size: 15px; margin-bottom: 4px; line-height: 1.4; }
        .cms-item__body h4 a { color: var(--primary-dark); }
        .cms-item__body h4 a:hover { color: var(--accent); }
        .cms-item__meta { font-size: 12px; color: var(--text-light); display: flex; gap: 12px; flex-wrap: wrap; }
        .cms-item__meta .tag { background: rgba(232,168,56,0.12); color: var(--accent-dark); padding: 2px 10px; border-radius: 20px; font-size: 11px; font-weight: 500; }
        .cms-empty { padding: 40px 20px; text-align: center; color: var(--text-light); grid-column: 1 / -1; background: var(--bg-white); border-radius: var(--radius); box-shadow: var(--shadow); }

        /* ===== Stats ===== */
        .stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
        .stat-item { text-align: center; padding: 32px 16px; background: rgba(255,255,255,0.06); border-radius: var(--radius); border: 1px solid rgba(255,255,255,0.08); }
        .stat-item__num { font-size: clamp(32px, 4vw, 48px); font-weight: 800; color: var(--accent); line-height: 1.1; }
        .stat-item__label { font-size: 14px; color: rgba(255,255,255,0.7); margin-top: 8px; }

        /* ===== FAQ ===== */
        .faq-list { max-width: 760px; margin: 0 auto; }
        .faq-item { border-bottom: 1px solid var(--border); }
        .section--dark .faq-item { border-color: rgba(255,255,255,0.1); }
        .faq-question {
            padding: 20px 0; display: flex; justify-content: space-between; align-items: center;
            cursor: pointer; font-weight: 600; font-size: 17px; color: var(--primary-dark);
            transition: color var(--transition); user-select: none;
        }
        .section--dark .faq-question { color: #fff; }
        .faq-question i { transition: transform var(--transition); color: var(--accent); font-size: 14px; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0; overflow: hidden; transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--text-light); font-size: 15px; line-height: 1.7;
        }
        .section--dark .faq-answer { color: rgba(255,255,255,0.7); }
        .faq-item.open .faq-answer { max-height: 300px; padding-bottom: 20px; }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary-dark), var(--primary));
            padding: 80px 24px; text-align: center; position: relative; overflow: hidden;
        }
        .cta-section::before {
            content: ''; position: absolute; inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08; pointer-events: none;
        }
        .cta-section h2 { font-size: clamp(28px, 3.6vw, 42px); color: #fff; margin-bottom: 16px; }
        .cta-section p { color: rgba(255,255,255,0.8); font-size: 17px; max-width: 560px; margin: 0 auto 32px; }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-dark); color: rgba(255,255,255,0.6); padding: 48px 24px 28px;
        }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; margin-bottom: 32px; }
        .footer-brand h3 { font-size: 20px; color: #fff; margin-bottom: 8px; }
        .footer-brand h3 i { color: var(--accent); margin-right: 6px; }
        .footer-brand p { font-size: 14px; max-width: 360px; line-height: 1.7; }
        .footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 14px; }
        .footer-col a { display: block; color: rgba(255,255,255,0.5); font-size: 14px; padding: 4px 0; transition: color var(--transition); }
        .footer-col a:hover { color: var(--accent); }
        .footer-bottom { border-top: 1px solid rgba(255,255,255,0.06); padding-top: 20px; text-align: center; font-size: 13px; color: rgba(255,255,255,0.3); }

        /* ===== Back to top ===== */
        .back-top { position: fixed; bottom: 32px; right: 32px; width: 48px; height: 48px; border-radius: 50%;
            background: var(--accent); color: var(--primary-dark); border: none; font-size: 18px;
            cursor: pointer; box-shadow: 0 4px 16px rgba(232,168,56,0.3);
            transition: all var(--transition); opacity: 0; visibility: hidden; z-index: 900;
            display: flex; align-items: center; justify-content: center;
        }
        .back-top.visible { opacity: 1; visibility: visible; }
        .back-top:hover { background: var(--accent-light); transform: translateY(-3px); }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .grid-3 { grid-template-columns: repeat(2, 1fr); }
            .stats-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
            .cms-list { grid-template-columns: 1fr; }
        }

        @media (max-width: 768px) {
            :root { --nav-width: 0px; }
            .app-sidebar { transform: translateX(-100%); }
            .app-sidebar.open { transform: translateX(0); }
            .app-main { margin-left: 0; }
            .mobile-nav-toggle { display: flex; }
            .mobile-nav-overlay.active { display: block; }
            .hero { min-height: 70vh; padding: 80px 20px 40px; }
            .hero h1 { font-size: 32px; }
            .hero p { font-size: 16px; }
            .section { padding: 56px 0; }
            .grid-3, .grid-2 { grid-template-columns: 1fr; gap: 20px; }
            .steps { grid-template-columns: 1fr; gap: 32px; }
            .step::after { display: none; }
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
            .footer-grid { grid-template-columns: 1fr; gap: 28px; }
            .cta-section { padding: 56px 20px; }
            .cms-item { flex-direction: column; }
            .cms-item__thumb { width: 100%; min-height: 140px; }
            .faq-question { font-size: 15px; }
        }

        @media (max-width: 520px) {
            .hero h1 { font-size: 26px; }
            .hero-actions { flex-direction: column; align-items: center; }
            .btn { width: 100%; justify-content: center; }
            .stats-grid { grid-template-columns: 1fr; }
            .section-title h2 { font-size: 24px; }
            .card { padding: 24px 20px; }
            .back-top { bottom: 20px; right: 20px; width: 42px; height: 42px; font-size: 16px; }
        }

        /* ===== Accessibility ===== */
        a:focus-visible, button:focus-visible, input:focus-visible { outline: 3px solid var(--accent); outline-offset: 2px; }
        @media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; } }

/* roulang page: category1 */
/* ===== Design Variables ===== */
        :root {
            --primary: #e63946;
            --primary-dark: #b71c1c;
            --primary-light: #ff6b6b;
            --secondary: #1d3557;
            --secondary-light: #457b9d;
            --accent: #f4a261;
            --accent-light: #ffd166;
            --bg-main: #f8f9fa;
            --bg-dark: #0b1a2e;
            --bg-card: #ffffff;
            --bg-nav: #0f1f33;
            --bg-nav-hover: #1a2f4a;
            --text-primary: #1a1a2e;
            --text-secondary: #4a4a6a;
            --text-light: #8e8ea0;
            --text-white: #ffffff;
            --border-color: #e0e0e8;
            --border-light: rgba(255, 255, 255, 0.12);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 24px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.10);
            --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.15);
            --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.06);
            --shadow-card-hover: 0 12px 40px rgba(0, 0, 0, 0.12);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
            --sidebar-width: 240px;
            --header-height: 64px;
        }

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

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-main);
            display: flex;
            min-height: 100vh;
        }

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

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

        button,
        input,
        textarea {
            font-family: inherit;
            font-size: inherit;
            border: none;
            outline: none;
            transition: var(--transition);
        }

        button {
            cursor: pointer;
            background: none;
        }

        ul,
        ol {
            list-style: none;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: var(--text-primary);
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== Sidebar / Navigation ===== */
        .app-shell {
            display: flex;
            width: 100%;
            min-height: 100vh;
        }

        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-nav);
            color: var(--text-white);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            box-shadow: 2px 0 20px rgba(0, 0, 0, 0.2);
            transition: var(--transition);
        }

        .sidebar-brand {
            padding: 28px 20px 20px;
            border-bottom: 1px solid var(--border-light);
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .sidebar-brand .brand-icon {
            font-size: 28px;
            color: var(--primary-light);
        }

        .sidebar-brand h2 {
            font-size: 18px;
            font-weight: 700;
            color: var(--text-white);
            letter-spacing: 0.5px;
            line-height: 1.3;
        }

        .sidebar-brand h2 span {
            display: block;
            font-size: 12px;
            font-weight: 400;
            color: rgba(255, 255, 255, 0.6);
            letter-spacing: 1px;
            margin-top: 2px;
        }

        .nav-list {
            flex: 1;
            padding: 16px 12px;
            overflow-y: auto;
        }

        .nav-list ul {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }

        .nav-list li a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255, 255, 255, 0.75);
            font-size: 15px;
            font-weight: 500;
            transition: var(--transition);
        }

        .nav-list li a i {
            width: 20px;
            text-align: center;
            font-size: 16px;
            color: rgba(255, 255, 255, 0.5);
            transition: var(--transition);
        }

        .nav-list li a:hover {
            background: var(--bg-nav-hover);
            color: var(--text-white);
        }

        .nav-list li a:hover i {
            color: var(--primary-light);
        }

        .nav-list li a.active {
            background: rgba(230, 57, 70, 0.2);
            color: var(--text-white);
            border-left: 3px solid var(--primary);
        }

        .nav-list li a.active i {
            color: var(--primary-light);
        }

        .nav-footer {
            padding: 16px 20px;
            border-top: 1px solid var(--border-light);
            font-size: 12px;
            color: rgba(255, 255, 255, 0.4);
            text-align: center;
        }

        /* ===== Main Content ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }

        /* ===== Mobile Header ===== */
        .mobile-header {
            display: none;
            position: sticky;
            top: 0;
            z-index: 999;
            background: var(--bg-nav);
            color: var(--text-white);
            padding: 0 16px;
            height: var(--header-height);
            align-items: center;
            justify-content: space-between;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.15);
        }

        .mobile-header .brand-text {
            font-size: 16px;
            font-weight: 700;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .mobile-header .brand-text i {
            color: var(--primary-light);
        }

        .menu-toggle {
            font-size: 24px;
            color: var(--text-white);
            padding: 8px;
            border-radius: var(--radius-sm);
            background: rgba(255, 255, 255, 0.08);
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .menu-toggle:hover {
            background: rgba(255, 255, 255, 0.15);
        }

        /* ===== Hero ===== */
        .hero-section {
            position: relative;
            min-height: 460px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: linear-gradient(135deg, var(--bg-dark) 0%, #162a44 100%);
            overflow: hidden;
            padding: 60px 24px;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            opacity: 0.3;
            z-index: 0;
        }

        .hero-section::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to bottom, rgba(11, 26, 46, 0.6) 0%, rgba(11, 26, 46, 0.9) 100%);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 820px;
            padding: 20px;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(230, 57, 70, 0.25);
            backdrop-filter: blur(8px);
            padding: 8px 20px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            color: var(--accent-light);
            letter-spacing: 0.5px;
            border: 1px solid rgba(230, 57, 70, 0.3);
            margin-bottom: 20px;
        }

        .hero-badge i {
            font-size: 14px;
            color: var(--primary-light);
        }

        .hero-content h1 {
            font-size: 44px;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }

        .hero-content h1 span {
            color: var(--primary-light);
            background: linear-gradient(135deg, var(--primary-light), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-content p {
            font-size: 18px;
            color: rgba(255, 255, 255, 0.8);
            max-width: 640px;
            margin: 0 auto 28px;
            line-height: 1.7;
        }

        .hero-actions {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            justify-content: center;
        }

        .btn-primary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 700;
            color: var(--text-white);
            background: var(--primary);
            border: none;
            box-shadow: 0 8px 24px rgba(230, 57, 70, 0.35);
            transition: var(--transition);
            cursor: pointer;
        }

        .btn-primary:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 12px 32px rgba(230, 57, 70, 0.45);
        }

        .btn-primary:active {
            transform: translateY(0);
        }

        .btn-secondary {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-white);
            background: rgba(255, 255, 255, 0.12);
            border: 1px solid rgba(255, 255, 255, 0.25);
            backdrop-filter: blur(4px);
            transition: var(--transition);
            cursor: pointer;
        }

        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.2);
            border-color: rgba(255, 255, 255, 0.4);
            transform: translateY(-2px);
        }

        /* ===== Section Shared ===== */
        .section-block {
            padding: 72px 0;
        }

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

        .section-block .section-title h2 {
            font-size: 32px;
            font-weight: 800;
            margin-bottom: 12px;
            letter-spacing: -0.3px;
        }

        .section-block .section-title h2 i {
            color: var(--primary);
            margin-right: 8px;
        }

        .section-block .section-title p {
            font-size: 17px;
            color: var(--text-secondary);
            max-width: 600px;
            margin: 0 auto;
            line-height: 1.6;
        }

        .section-block.bg-alt {
            background: var(--bg-card);
        }

        .section-block.bg-dark {
            background: var(--bg-dark);
            color: var(--text-white);
        }

        .section-block.bg-dark .section-title h2 {
            color: var(--text-white);
        }

        .section-block.bg-dark .section-title p {
            color: rgba(255, 255, 255, 0.7);
        }

        /* ===== Features Grid ===== */
        .features-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 28px;
        }

        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 32px 24px;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
            transition: var(--transition);
            text-align: center;
        }

        .feature-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-card-hover);
            border-color: transparent;
        }

        .feature-card .icon-wrap {
            width: 64px;
            height: 64px;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(230, 57, 70, 0.1), rgba(244, 162, 97, 0.1));
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            font-size: 26px;
            color: var(--primary);
        }

        .feature-card h3 {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .feature-card p {
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ===== Cover Cards ===== */
        .cover-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 28px;
        }

        .cover-card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .cover-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-card-hover);
        }

        .cover-card .cover-img {
            height: 200px;
            background-size: cover;
            background-position: center;
            position: relative;
        }

        .cover-card .cover-img .tag {
            position: absolute;
            top: 14px;
            left: 14px;
            background: var(--primary);
            color: var(--text-white);
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.3px;
        }

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

        .cover-card .cover-body h3 {
            font-size: 19px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .cover-card .cover-body p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
            margin-bottom: 14px;
        }

        .cover-card .cover-body .meta {
            display: flex;
            align-items: center;
            gap: 16px;
            font-size: 13px;
            color: var(--text-light);
        }

        .cover-card .cover-body .meta i {
            margin-right: 4px;
        }

        /* ===== Process / Steps ===== */
        .process-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 32px;
            counter-reset: step;
        }

        .process-step {
            text-align: center;
            position: relative;
            padding: 28px 16px;
        }

        .process-step .step-num {
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--text-white);
            font-size: 22px;
            font-weight: 800;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 16px;
            box-shadow: 0 6px 20px rgba(230, 57, 70, 0.3);
        }

        .process-step h4 {
            font-size: 18px;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .process-step p {
            font-size: 14px;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        .process-step::after {
            content: '';
            position: absolute;
            top: 42px;
            right: -16px;
            width: 24px;
            height: 2px;
            background: var(--border-color);
            display: none;
        }

        .process-grid .process-step:not(:last-child)::after {
            display: block;
        }

        @media (min-width: 900px) {
            .process-grid .process-step:not(:last-child)::after {
                display: block;
            }
        }

        @media (max-width: 899px) {
            .process-grid .process-step::after {
                display: none !important;
            }
            .process-grid {
                gap: 16px;
            }
        }

        /* ===== FAQ ===== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-item:hover {
            border-color: var(--primary-light);
        }

        .faq-question {
            width: 100%;
            padding: 18px 22px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            font-size: 16px;
            font-weight: 600;
            color: var(--text-primary);
            background: transparent;
            text-align: left;
            gap: 12px;
            cursor: pointer;
        }

        .faq-question i {
            font-size: 14px;
            color: var(--text-light);
            transition: var(--transition);
            flex-shrink: 0;
        }

        .faq-question.open i {
            transform: rotate(180deg);
            color: var(--primary);
        }

        .faq-answer {
            padding: 0 22px 18px;
            font-size: 15px;
            color: var(--text-secondary);
            line-height: 1.7;
            display: none;
        }

        .faq-answer.open {
            display: block;
        }

        /* ===== CTA ===== */
        .cta-block {
            background: linear-gradient(135deg, var(--bg-dark), #1a2f4a);
            padding: 72px 24px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .cta-block::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }

        .cta-block .container {
            position: relative;
            z-index: 1;
        }

        .cta-block h2 {
            font-size: 34px;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 14px;
        }

        .cta-block p {
            font-size: 17px;
            color: rgba(255, 255, 255, 0.75);
            max-width: 560px;
            margin: 0 auto 28px;
        }

        .cta-block .btn-primary {
            font-size: 18px;
            padding: 16px 44px;
        }

        /* ===== Footer ===== */
        .site-footer {
            background: var(--bg-nav);
            color: var(--text-white);
            padding: 48px 0 28px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid var(--border-light);
        }

        .footer-brand h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 8px;
        }

        .footer-brand h3 i {
            color: var(--primary-light);
        }

        .footer-brand p {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            line-height: 1.7;
            max-width: 360px;
        }

        .footer-col h4 {
            font-size: 15px;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 16px;
            letter-spacing: 0.5px;
        }

        .footer-col a {
            display: block;
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            padding: 5px 0;
            transition: var(--transition);
        }

        .footer-col a:hover {
            color: var(--primary-light);
            padding-left: 4px;
        }

        .footer-bottom {
            text-align: center;
            padding-top: 24px;
            font-size: 13px;
            color: rgba(255, 255, 255, 0.4);
        }

        /* ===== Back to Top ===== */
        .back-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--text-white);
            font-size: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 6px 24px rgba(230, 57, 70, 0.35);
            z-index: 99;
            transition: var(--transition);
            opacity: 0;
            pointer-events: none;
            transform: translateY(20px);
        }

        .back-top.visible {
            opacity: 1;
            pointer-events: auto;
            transform: translateY(0);
        }

        .back-top:hover {
            background: var(--primary-dark);
            transform: translateY(-4px);
            box-shadow: 0 10px 32px rgba(230, 57, 70, 0.45);
        }

        /* ===== Responsive ===== */
        @media (max-width: 1024px) {
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
            .hero-content h1 {
                font-size: 36px;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
            }

            .sidebar.open {
                transform: translateX(0);
            }

            .mobile-header {
                display: flex;
            }

            .main-content {
                margin-left: 0;
            }

            .hero-content h1 {
                font-size: 30px;
            }

            .hero-content p {
                font-size: 16px;
            }

            .section-block {
                padding: 48px 0;
            }

            .section-block .section-title h2 {
                font-size: 26px;
            }

            .features-grid {
                grid-template-columns: 1fr;
            }

            .cover-grid {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .process-grid {
                grid-template-columns: 1fr 1fr;
            }

            .cta-block h2 {
                font-size: 26px;
            }

            .hero-section {
                min-height: 360px;
                padding: 40px 16px;
            }
        }

        @media (max-width: 520px) {
            .hero-content h1 {
                font-size: 24px;
            }

            .hero-actions {
                flex-direction: column;
                align-items: center;
            }

            .btn-primary,
            .btn-secondary {
                width: 100%;
                justify-content: center;
            }

            .process-grid {
                grid-template-columns: 1fr;
            }

            .section-block .section-title h2 {
                font-size: 22px;
            }

            .cover-card .cover-img {
                height: 160px;
            }

            .faq-question {
                font-size: 14px;
                padding: 14px 16px;
            }

            .faq-answer {
                font-size: 14px;
                padding: 0 16px 14px;
            }

            .back-top {
                bottom: 20px;
                right: 20px;
                width: 42px;
                height: 42px;
                font-size: 16px;
            }
        }

        /* ===== Overlay for mobile ===== */
        .sidebar-overlay {
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.5);
            z-index: 998;
            opacity: 0;
            pointer-events: none;
            transition: var(--transition);
        }

        .sidebar-overlay.open {
            opacity: 1;
            pointer-events: auto;
        }

        @media (min-width: 769px) {
            .sidebar-overlay {
                display: none;
            }
        }

        /* ===== Accessibility ===== */
        a:focus-visible,
        button:focus-visible {
            outline: 3px solid var(--primary-light);
            outline-offset: 2px;
        }

        /* ===== Scrollbar ===== */
        .nav-list::-webkit-scrollbar {
            width: 4px;
        }

        .nav-list::-webkit-scrollbar-track {
            background: transparent;
        }

        .nav-list::-webkit-scrollbar-thumb {
            background: rgba(255, 255, 255, 0.15);
            border-radius: 4px;
        }

        .nav-list::-webkit-scrollbar-thumb:hover {
            background: rgba(255, 255, 255, 0.25);
        }

        /* ===== Countup stats ===== */
        .stats-row {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 24px;
            margin-top: 16px;
        }

        .stat-item {
            text-align: center;
            padding: 20px 12px;
            background: rgba(255, 255, 255, 0.06);
            border-radius: var(--radius-sm);
            border: 1px solid rgba(255, 255, 255, 0.08);
        }

        .stat-item .stat-number {
            font-size: 32px;
            font-weight: 800;
            color: var(--accent-light);
            line-height: 1.2;
        }

        .stat-item .stat-label {
            font-size: 14px;
            color: rgba(255, 255, 255, 0.6);
            margin-top: 4px;
        }

        .bg-dark .stat-item {
            background: rgba(255, 255, 255, 0.05);
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
        :root {
            --clr-primary: #e53935;
            --clr-primary-dark: #c62828;
            --clr-primary-light: #ff6f60;
            --clr-accent: #ffb300;
            --clr-accent-dark: #c79100;
            --clr-bg: #0f0f1a;
            --clr-bg-alt: #1a1a2e;
            --clr-bg-card: #222240;
            --clr-bg-card-hover: #2a2a50;
            --clr-surface: #16213e;
            --clr-text: #f0f0f5;
            --clr-text-muted: #a0a0b8;
            --clr-text-light: #c8c8dc;
            --clr-border: rgba(255, 255, 255, 0.08);
            --clr-border-light: rgba(255, 255, 255, 0.15);
            --clr-overlay: rgba(0, 0, 0, 0.65);
            --clr-overlay-light: rgba(0, 0, 0, 0.40);
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --shadow-sm: 0 2px 12px rgba(0, 0, 0, 0.3);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.4);
            --shadow-lg: 0 16px 50px rgba(0, 0, 0, 0.5);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 260px;
            --header-height: 0px;
            --container-max: 1200px;
        }

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

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
            font-size: 16px;
        }

        body {
            font-family: var(--font-sans);
            background: var(--clr-bg);
            color: var(--clr-text);
            line-height: 1.7;
            min-height: 100vh;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

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

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

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

        button {
            cursor: pointer;
        }

        ul,
        ol {
            list-style: none;
        }

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

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

        /* ===== 布局（左侧导航 + 主内容） ===== */
        .app-layout {
            display: flex;
            min-height: 100vh;
        }

        /* ===== 侧边栏 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--clr-bg-alt);
            border-right: 1px solid var(--clr-border);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            padding: 28px 0 20px;
            overflow-y: auto;
            transition: transform var(--transition), opacity var(--transition);
        }

        .sidebar-brand {
            padding: 0 24px 28px;
            border-bottom: 1px solid var(--clr-border);
            margin-bottom: 20px;
        }

        .sidebar-brand a {
            display: flex;
            align-items: center;
            gap: 12px;
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--clr-text);
            text-decoration: none;
        }
        .sidebar-brand a i {
            font-size: 1.6rem;
            color: var(--clr-primary);
            background: rgba(229, 57, 53, 0.15);
            padding: 8px;
            border-radius: 12px;
        }
        .sidebar-brand a:hover {
            color: var(--clr-primary-light);
        }
        .sidebar-brand a:hover i {
            background: rgba(229, 57, 53, 0.25);
        }

        .nav-list ul {
            display: flex;
            flex-direction: column;
            gap: 4px;
            padding: 0 12px;
        }

        .nav-list li a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--clr-text-light);
            transition: background var(--transition), color var(--transition), transform var(--transition);
        }
        .nav-list li a i {
            width: 22px;
            font-size: 1.1rem;
            color: var(--clr-text-muted);
            transition: color var(--transition);
        }
        .nav-list li a:hover {
            background: rgba(255, 255, 255, 0.06);
            color: var(--clr-text);
            transform: translateX(4px);
        }
        .nav-list li a:hover i {
            color: var(--clr-primary-light);
        }
        .nav-list li a.active {
            background: rgba(229, 57, 53, 0.15);
            color: var(--clr-primary-light);
            font-weight: 600;
        }
        .nav-list li a.active i {
            color: var(--clr-primary);
        }
        .nav-list li a:focus-visible {
            outline: 2px solid var(--clr-accent);
            outline-offset: 2px;
        }

        /* ===== 移动端菜单切换 ===== */
        .menu-toggle {
            display: none;
            position: fixed;
            top: 16px;
            left: 16px;
            z-index: 1100;
            background: var(--clr-bg-alt);
            border: 1px solid var(--clr-border-light);
            color: var(--clr-text);
            width: 46px;
            height: 46px;
            border-radius: 12px;
            font-size: 1.4rem;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-sm);
            transition: background var(--transition), transform var(--transition);
        }
        .menu-toggle:hover {
            background: var(--clr-bg-card);
        }
        .menu-toggle:active {
            transform: scale(0.94);
        }

        .sidebar-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0, 0, 0, 0.55);
            z-index: 999;
            backdrop-filter: blur(4px);
        }

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

        /* ===== 文章 Banner ===== */
        .article-banner {
            position: relative;
            padding: 80px 0 70px;
            background: var(--clr-bg-alt);
            overflow: hidden;
            border-bottom: 1px solid var(--clr-border);
        }
        .article-banner::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            opacity: 0.20;
            transform: scale(1.05);
            filter: saturate(0.6);
        }
        .article-banner .overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15, 15, 26, 0.85) 0%, rgba(26, 26, 46, 0.70) 100%);
        }
        .article-banner .container {
            position: relative;
            z-index: 2;
        }

        .article-breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 8px;
            font-size: 0.85rem;
            color: var(--clr-text-muted);
            margin-bottom: 24px;
        }
        .article-breadcrumb a {
            color: var(--clr-text-muted);
            transition: color var(--transition);
        }
        .article-breadcrumb a:hover {
            color: var(--clr-primary-light);
        }
        .article-breadcrumb i {
            font-size: 0.65rem;
            color: var(--clr-text-muted);
        }
        .article-breadcrumb .current {
            color: var(--clr-text-light);
        }

        .article-banner h1 {
            font-size: 2.4rem;
            font-weight: 800;
            color: var(--clr-text);
            max-width: 900px;
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 18px 28px;
            font-size: 0.92rem;
            color: var(--clr-text-muted);
        }
        .article-meta span {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .article-meta i {
            font-size: 0.9rem;
            color: var(--clr-primary-light);
            width: 16px;
        }
        .article-meta .category-tag {
            background: rgba(229, 57, 53, 0.18);
            color: var(--clr-primary-light);
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 0.82rem;
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 6px;
            border: 1px solid rgba(229, 57, 53, 0.25);
        }

        /* ===== 文章正文区 ===== */
        .article-body-section {
            padding: 60px 0 50px;
            background: var(--clr-bg);
        }

        .article-body-wrapper {
            max-width: 860px;
            margin: 0 auto;
        }

        .article-body {
            font-size: 1.05rem;
            line-height: 1.85;
            color: var(--clr-text-light);
        }
        .article-body p {
            margin-bottom: 1.4em;
        }
        .article-body h2,
        .article-body h3,
        .article-body h4 {
            margin-top: 1.8em;
            margin-bottom: 0.6em;
            color: var(--clr-text);
        }
        .article-body h2 {
            font-size: 1.6rem;
        }
        .article-body h3 {
            font-size: 1.3rem;
        }
        .article-body img {
            border-radius: var(--radius-md);
            margin: 1.8em 0;
            box-shadow: var(--shadow-md);
        }
        .article-body ul,
        .article-body ol {
            padding-left: 1.6em;
            margin-bottom: 1.4em;
        }
        .article-body ul li {
            list-style: disc;
            margin-bottom: 0.3em;
        }
        .article-body ol li {
            list-style: decimal;
            margin-bottom: 0.3em;
        }
        .article-body blockquote {
            border-left: 4px solid var(--clr-primary);
            padding: 12px 24px;
            margin: 1.6em 0;
            background: rgba(255, 255, 255, 0.03);
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--clr-text-muted);
            font-style: italic;
        }
        .article-body a {
            color: var(--clr-primary-light);
            text-decoration: underline;
            text-underline-offset: 3px;
        }
        .article-body a:hover {
            color: var(--clr-accent);
        }

        .article-not-found {
            text-align: center;
            padding: 80px 20px;
            background: var(--clr-bg-alt);
            border-radius: var(--radius-md);
            border: 1px solid var(--clr-border);
        }
        .article-not-found i {
            font-size: 3rem;
            color: var(--clr-text-muted);
            margin-bottom: 20px;
            display: block;
        }
        .article-not-found h2 {
            font-size: 1.6rem;
            margin-bottom: 12px;
        }
        .article-not-found p {
            color: var(--clr-text-muted);
            margin-bottom: 24px;
        }
        .article-not-found .btn {
            display: inline-flex;
        }

        /* ===== 相关推荐 ===== */
        .related-section {
            padding: 60px 0;
            background: var(--clr-bg-alt);
            border-top: 1px solid var(--clr-border);
            border-bottom: 1px solid var(--clr-border);
        }

        .related-section .section-title {
            font-size: 1.65rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--clr-text);
        }
        .related-section .section-sub {
            color: var(--clr-text-muted);
            margin-bottom: 36px;
            font-size: 1rem;
        }

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

        .related-card {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--clr-border);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
        }
        .related-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-md);
            border-color: var(--clr-border-light);
        }
        .related-card .card-img {
            width: 100%;
            height: 180px;
            object-fit: cover;
            border-radius: 0;
            display: block;
        }
        .related-card .card-body {
            padding: 20px 22px 24px;
        }
        .related-card .card-body h3 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 8px;
            color: var(--clr-text);
        }
        .related-card .card-body p {
            font-size: 0.9rem;
            color: var(--clr-text-muted);
            line-height: 1.6;
        }
        .related-card .card-body .tag {
            display: inline-block;
            margin-top: 12px;
            font-size: 0.78rem;
            color: var(--clr-primary-light);
            background: rgba(229, 57, 53, 0.12);
            padding: 3px 12px;
            border-radius: 16px;
            font-weight: 500;
        }

        /* ===== 平台优势 ===== */
        .features-section {
            padding: 60px 0;
            background: var(--clr-bg);
        }
        .features-section .section-title {
            font-size: 1.65rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--clr-text);
        }
        .features-section .section-sub {
            color: var(--clr-text-muted);
            margin-bottom: 40px;
            font-size: 1rem;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 28px;
        }

        .feature-item {
            background: var(--clr-bg-card);
            border-radius: var(--radius-md);
            padding: 32px 28px;
            border: 1px solid var(--clr-border);
            transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
            text-align: center;
        }
        .feature-item:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-sm);
            border-color: var(--clr-border-light);
        }
        .feature-item .icon-wrap {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            background: rgba(229, 57, 53, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 18px;
            font-size: 1.6rem;
            color: var(--clr-primary);
            transition: background var(--transition), transform var(--transition);
        }
        .feature-item:hover .icon-wrap {
            background: rgba(229, 57, 53, 0.22);
            transform: scale(1.05);
        }
        .feature-item h3 {
            font-size: 1.15rem;
            font-weight: 600;
            margin-bottom: 10px;
            color: var(--clr-text);
        }
        .feature-item p {
            font-size: 0.92rem;
            color: var(--clr-text-muted);
            line-height: 1.65;
        }

        /* ===== FAQ ===== */
        .faq-section {
            padding: 60px 0;
            background: var(--clr-bg-alt);
            border-top: 1px solid var(--clr-border);
        }
        .faq-section .section-title {
            font-size: 1.65rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--clr-text);
        }
        .faq-section .section-sub {
            color: var(--clr-text-muted);
            margin-bottom: 36px;
            font-size: 1rem;
        }

        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .faq-item {
            background: var(--clr-bg-card);
            border-radius: var(--radius-sm);
            border: 1px solid var(--clr-border);
            overflow: hidden;
            transition: border-color var(--transition), box-shadow var(--transition);
        }
        .faq-item:hover {
            border-color: var(--clr-border-light);
        }
        .faq-item summary {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1rem;
            color: var(--clr-text);
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 12px;
            list-style: none;
            transition: background var(--transition);
        }
        .faq-item summary::-webkit-details-marker {
            display: none;
        }
        .faq-item summary::before {
            content: '\f059';
            font-family: 'Font Awesome 6 Free';
            font-weight: 400;
            font-size: 1.1rem;
            color: var(--clr-primary-light);
            flex-shrink: 0;
        }
        .faq-item summary::after {
            content: '\f107';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            margin-left: auto;
            transition: transform var(--transition);
            color: var(--clr-text-muted);
        }
        .faq-item[open] summary::after {
            transform: rotate(180deg);
        }
        .faq-item[open] summary {
            background: rgba(255, 255, 255, 0.02);
        }
        .faq-item .faq-answer {
            padding: 4px 24px 20px 24px;
            color: var(--clr-text-muted);
            font-size: 0.95rem;
            line-height: 1.7;
            border-top: 1px solid var(--clr-border);
            margin-top: 0;
            padding-top: 16px;
        }

        /* ===== CTA ===== */
        .cta-section {
            padding: 70px 0;
            background: var(--clr-bg);
            text-align: center;
            border-top: 1px solid var(--clr-border);
        }
        .cta-section h2 {
            font-size: 1.9rem;
            font-weight: 800;
            margin-bottom: 14px;
            color: var(--clr-text);
        }
        .cta-section p {
            font-size: 1.05rem;
            color: var(--clr-text-muted);
            max-width: 600px;
            margin: 0 auto 32px;
        }
        .cta-buttons {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 14px 36px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            transition: all var(--transition);
            border: none;
            text-decoration: none;
        }
        .btn-primary {
            background: var(--clr-primary);
            color: #fff;
            box-shadow: 0 4px 20px rgba(229, 57, 53, 0.35);
        }
        .btn-primary:hover {
            background: var(--clr-primary-dark);
            transform: translateY(-2px);
            box-shadow: 0 8px 30px rgba(229, 57, 53, 0.45);
            color: #fff;
        }
        .btn-primary:active {
            transform: translateY(0);
            box-shadow: 0 2px 12px rgba(229, 57, 53, 0.3);
        }
        .btn-secondary {
            background: transparent;
            color: var(--clr-text);
            border: 1.5px solid var(--clr-border-light);
        }
        .btn-secondary:hover {
            background: rgba(255, 255, 255, 0.06);
            border-color: var(--clr-primary-light);
            color: var(--clr-primary-light);
            transform: translateY(-2px);
        }
        .btn-secondary:active {
            transform: translateY(0);
        }
        .btn:focus-visible {
            outline: 2px solid var(--clr-accent);
            outline-offset: 4px;
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--clr-bg-alt);
            border-top: 1px solid var(--clr-border);
            padding: 50px 0 30px;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 30px;
            border-bottom: 1px solid var(--clr-border);
        }
        .footer-brand h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--clr-text);
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 14px;
        }
        .footer-brand h3 i {
            color: var(--clr-primary);
            font-size: 1.3rem;
        }
        .footer-brand p {
            font-size: 0.9rem;
            color: var(--clr-text-muted);
            line-height: 1.7;
            max-width: 360px;
        }
        .footer-col h4 {
            font-size: 1rem;
            font-weight: 600;
            color: var(--clr-text);
            margin-bottom: 16px;
        }
        .footer-col a {
            display: block;
            font-size: 0.9rem;
            color: var(--clr-text-muted);
            padding: 5px 0;
            transition: color var(--transition), padding-left var(--transition);
        }
        .footer-col a:hover {
            color: var(--clr-primary-light);
            padding-left: 6px;
        }
        .footer-bottom {
            text-align: center;
            padding-top: 24px;
            font-size: 0.85rem;
            color: var(--clr-text-muted);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .related-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .features-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .sidebar {
                transform: translateX(-100%);
                opacity: 0;
                pointer-events: none;
                width: 280px;
                border-right: none;
                box-shadow: var(--shadow-lg);
            }
            .sidebar.open {
                transform: translateX(0);
                opacity: 1;
                pointer-events: auto;
            }
            .sidebar-overlay.open {
                display: block;
            }
            .menu-toggle {
                display: flex;
            }
            .main-content {
                margin-left: 0;
            }
            .article-banner {
                padding: 60px 0 50px;
            }
            .article-banner h1 {
                font-size: 1.7rem;
            }
            .article-meta {
                gap: 12px 18px;
                font-size: 0.85rem;
            }
            .article-body {
                font-size: 0.98rem;
            }
            .related-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .features-grid {
                grid-template-columns: 1fr;
                gap: 18px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .cta-section h2 {
                font-size: 1.5rem;
            }
            .cta-buttons {
                flex-direction: column;
                align-items: center;
            }
            .btn {
                width: 100%;
                max-width: 320px;
                justify-content: center;
            }
            .article-banner h1 {
                font-size: 1.5rem;
            }
            .article-body-wrapper {
                padding: 0 4px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 16px;
            }
            .article-banner {
                padding: 50px 0 40px;
            }
            .article-banner h1 {
                font-size: 1.3rem;
            }
            .article-meta {
                gap: 8px 12px;
                font-size: 0.8rem;
            }
            .article-body {
                font-size: 0.92rem;
            }
            .related-card .card-img {
                height: 160px;
            }
            .feature-item {
                padding: 24px 18px;
            }
            .faq-item summary {
                padding: 14px 18px;
                font-size: 0.92rem;
            }
            .faq-item .faq-answer {
                padding: 4px 18px 16px 18px;
                font-size: 0.88rem;
            }
            .cta-section {
                padding: 50px 0;
            }
            .cta-section h2 {
                font-size: 1.3rem;
            }
            .site-footer {
                padding: 36px 0 24px;
            }
            .footer-brand h3 {
                font-size: 1.05rem;
            }
        }

        /* ===== 辅助 ===== */
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            border: 0;
        }

        /* ===== 滚动条 ===== */
        .sidebar::-webkit-scrollbar {
            width: 4px;
        }
        .sidebar::-webkit-scrollbar-track {
            background: transparent;
        }
        .sidebar::-webkit-scrollbar-thumb {
            background: var(--clr-border-light);
            border-radius: 4px;
        }
        .sidebar::-webkit-scrollbar-thumb:hover {
            background: var(--clr-text-muted);
        }