/* roulang page: index */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a56db;
            --primary-dark: #1243af;
            --primary-light: #3b82f6;
            --primary-soft: #eff6ff;
            --secondary: #f59e0b;
            --secondary-dark: #d97706;
            --accent: #10b981;
            --bg-body: #ffffff;
            --bg-alt: #f8fafc;
            --bg-card: #ffffff;
            --text-primary: #0f172a;
            --text-secondary: #475569;
            --text-muted: #94a3b8;
            --text-white: #ffffff;
            --border: #e2e8f0;
            --border-light: #f1f5f9;
            --radius-sm: 6px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
            --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 4px rgba(0,0,0,0.04);
            --shadow-lg: 0 12px 40px rgba(0,0,0,0.10), 0 4px 12px rgba(0,0,0,0.06);
            --shadow-xl: 0 24px 60px rgba(0,0,0,0.14);
            --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
            --container-max: 1200px;
            --header-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-body);
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--primary-dark); }
        a:focus-visible { outline: 3px solid var(--primary-light); outline-offset: 2px; border-radius: 2px; }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: inherit; }
        button { cursor: pointer; border: none; background: none; }
        button:focus-visible { outline: 3px solid var(--primary-light); outline-offset: 2px; border-radius: var(--radius-sm); }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
        p { margin-bottom: 1em; color: var(--text-secondary); }
        p:last-child { margin-bottom: 0; }
        .container {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
        }
        .container-narrow { max-width: 920px; }
        section { padding: 80px 0; }
        .section-label {
            display: inline-block;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.06em;
            text-transform: uppercase;
            color: var(--primary);
            background: var(--primary-soft);
            padding: 4px 14px;
            border-radius: 30px;
            margin-bottom: 16px;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 12px;
            color: var(--text-primary);
        }
        .section-sub {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin-bottom: 40px;
        }
        .text-center { text-align: center; }
        .mx-auto { margin-left: auto; margin-right: auto; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
        @media (max-width: 1024px) {
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; gap: 24px; }
            section { padding: 56px 0; }
            .section-title { font-size: 1.65rem; }
            .container { padding: 0 16px; }
        }

        /* ===== Buttons ===== */
        .btn {
            display: inline-flex; align-items: center; gap: 8px;
            padding: 12px 28px; border-radius: var(--radius-md);
            font-weight: 600; font-size: 0.95rem;
            transition: all var(--transition);
            border: 2px solid transparent;
            text-align: center;
            line-height: 1.4;
        }
        .btn-primary {
            background: var(--primary); color: var(--text-white); border-color: var(--primary);
        }
        .btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: var(--text-white); box-shadow: var(--shadow-md); transform: translateY(-1px); }
        .btn-primary:active { transform: translateY(0); box-shadow: var(--shadow-sm); }
        .btn-secondary {
            background: var(--secondary); color: #1e293b; border-color: var(--secondary);
        }
        .btn-secondary:hover { background: var(--secondary-dark); border-color: var(--secondary-dark); color: #1e293b; box-shadow: var(--shadow-md); transform: translateY(-1px); }
        .btn-outline {
            background: transparent; color: var(--primary); border-color: var(--primary);
        }
        .btn-outline:hover { background: var(--primary); color: var(--text-white); box-shadow: var(--shadow-sm); transform: translateY(-1px); }
        .btn-lg { padding: 16px 36px; font-size: 1.05rem; border-radius: var(--radius-md); }
        .btn-sm { padding: 8px 18px; font-size: 0.85rem; border-radius: var(--radius-sm); }

        /* ===== Cards ===== */
        .card {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            border: 1px solid var(--border);
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            overflow: hidden;
        }
        .card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--primary-light); }
        .card-img { width: 100%; aspect-ratio: 16/10; object-fit: cover; display: block; }
        .card-body { padding: 24px; }
        .card-title { font-size: 1.15rem; font-weight: 700; margin-bottom: 8px; }
        .card-text { font-size: 0.92rem; color: var(--text-secondary); line-height: 1.6; }
        .card-tag {
            display: inline-block; font-size: 0.75rem; font-weight: 600;
            padding: 2px 12px; border-radius: 20px;
            background: var(--primary-soft); color: var(--primary);
            margin-bottom: 10px;
        }
        .card-meta { font-size: 0.82rem; color: var(--text-muted); margin-top: 12px; display: flex; gap: 16px; align-items: center; }

        /* ===== Badge ===== */
        .badge {
            display: inline-flex; align-items: center; gap: 4px;
            font-size: 0.75rem; font-weight: 600; padding: 3px 12px;
            border-radius: 30px; background: var(--primary-soft); color: var(--primary);
        }
        .badge-secondary { background: #fef3c7; color: #b45309; }
        .badge-accent { background: #d1fae5; color: #047857; }

        /* ===== Header & Navigation ===== */
        .site-header {
            position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
            height: var(--header-height);
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border-light);
            transition: background var(--transition), box-shadow var(--transition);
        }
        .site-header.scrolled { background: rgba(255,255,255,0.98); box-shadow: var(--shadow-sm); }
        .header-inner {
            max-width: var(--container-max);
            margin: 0 auto;
            padding: 0 24px;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .logo {
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--text-primary);
            letter-spacing: -0.02em;
            display: flex;
            align-items: center;
            gap: 8px;
            white-space: nowrap;
        }
        .logo i { color: var(--primary); font-size: 1.5rem; }
        .logo span { background: linear-gradient(135deg, var(--primary), var(--primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .logo:hover { color: var(--text-primary); }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-list a {
            display: inline-flex; align-items: center; gap: 6px;
            padding: 8px 18px;
            border-radius: 30px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            border: 1px solid transparent;
        }
        .nav-list a i { font-size: 0.85rem; }
        .nav-list a:hover { color: var(--primary); background: var(--primary-soft); border-color: var(--border); }
        .nav-list a.active {
            color: var(--text-white);
            background: var(--primary);
            border-color: var(--primary);
            box-shadow: 0 2px 8px rgba(26,86,219,0.25);
        }
        .nav-list a.active:hover { color: var(--text-white); background: var(--primary-dark); }
        .nav-cta .btn { padding: 8px 20px; font-size: 0.88rem; border-radius: 30px; }
        .mobile-toggle { display: none; font-size: 1.4rem; color: var(--text-primary); padding: 6px; border-radius: var(--radius-sm); }
        .mobile-toggle:hover { background: var(--border-light); }
        @media (max-width: 768px) {
            .mobile-toggle { display: block; }
            .nav-list { display: none; position: absolute; top: var(--header-height); left: 0; right: 0; background: rgba(255,255,255,0.98); backdrop-filter: blur(14px); flex-direction: column; padding: 16px 24px 24px; border-bottom: 1px solid var(--border); box-shadow: var(--shadow-md); gap: 4px; }
            .nav-list.open { display: flex; }
            .nav-list a { width: 100%; padding: 12px 16px; border-radius: var(--radius-sm); justify-content: flex-start; }
            .nav-cta { display: none; }
        }

        /* ===== Hero ===== */
        .hero {
            min-height: 92vh;
            display: flex;
            align-items: center;
            position: relative;
            padding: 120px 0 80px;
            overflow: hidden;
            background: linear-gradient(135deg, #0b1a33 0%, #0f2847 40%, #1a365d 100%);
        }
        .hero-bg {
            position: absolute; inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            opacity: 0.28;
            mix-blend-mode: overlay;
            pointer-events: none;
        }
        .hero-overlay {
            position: absolute; inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(26,86,219,0.30) 0%, transparent 70%);
            pointer-events: none;
        }
        .hero-content {
            position: relative; z-index: 2;
            max-width: 820px;
        }
        .hero h1 {
            font-size: 3rem;
            font-weight: 900;
            color: var(--text-white);
            line-height: 1.2;
            margin-bottom: 20px;
            letter-spacing: -0.02em;
        }
        .hero h1 .highlight { color: var(--secondary); }
        .hero p {
            font-size: 1.2rem;
            color: rgba(255,255,255,0.78);
            max-width: 680px;
            margin-bottom: 32px;
            line-height: 1.7;
        }
        .hero-actions { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
        .hero-stats {
            display: flex; gap: 40px; margin-top: 48px; padding-top: 32px;
            border-top: 1px solid rgba(255,255,255,0.12);
        }
        .hero-stat-item { text-align: left; }
        .hero-stat-num { font-size: 1.8rem; font-weight: 800; color: var(--text-white); }
        .hero-stat-label { font-size: 0.85rem; color: rgba(255,255,255,0.6); }
        @media (max-width: 768px) {
            .hero { min-height: 70vh; padding: 100px 0 56px; }
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 1rem; }
            .hero-stats { gap: 24px; flex-wrap: wrap; }
            .hero-stat-num { font-size: 1.4rem; }
        }
        @media (max-width: 520px) {
            .hero h1 { font-size: 1.65rem; }
            .hero-actions { flex-direction: column; width: 100%; }
            .hero-actions .btn { width: 100%; justify-content: center; }
        }

        /* ===== Services / Features ===== */
        .services-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
        .service-card {
            background: var(--bg-card); border-radius: var(--radius-md);
            padding: 32px 24px; border: 1px solid var(--border);
            transition: all var(--transition); text-align: center;
        }
        .service-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); border-color: var(--primary-light); }
        .service-icon {
            width: 60px; height: 60px; border-radius: 16px;
            display: flex; align-items: center; justify-content: center;
            margin: 0 auto 18px;
            font-size: 1.6rem;
            background: var(--primary-soft); color: var(--primary);
        }
        .service-card h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
        .service-card p { font-size: 0.9rem; color: var(--text-secondary); }
        @media (max-width: 1024px) { .services-grid { grid-template-columns: repeat(2, 1fr); } }
        @media (max-width: 520px) { .services-grid { grid-template-columns: 1fr; } }

        /* ===== Advantages / Stats ===== */
        .advantages {
            background: var(--bg-alt);
        }
        .adv-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
        .adv-item { display: flex; gap: 16px; align-items: flex-start; }
        .adv-icon { flex-shrink: 0; width: 44px; height: 44px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; background: var(--primary-soft); color: var(--primary); }
        .adv-item h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 4px; }
        .adv-item p { font-size: 0.88rem; color: var(--text-secondary); }
        @media (max-width: 768px) { .adv-grid { grid-template-columns: 1fr; gap: 24px; } }

        /* ===== Content / CMS List ===== */
        .content-section { background: var(--bg-body); }
        .content-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .content-card { background: var(--bg-card); border-radius: var(--radius-md); border: 1px solid var(--border); overflow: hidden; transition: all var(--transition); }
        .content-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--primary-light); }
        .content-card .card-img { aspect-ratio: 16/9; }
        .content-card .card-body { padding: 20px; }
        .content-card .card-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .content-card .card-text { font-size: 0.88rem; color: var(--text-secondary); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
        .content-card .card-meta { font-size: 0.8rem; color: var(--text-muted); margin-top: 10px; display: flex; gap: 12px; }
        .empty-msg { grid-column: 1 / -1; text-align: center; padding: 48px 24px; color: var(--text-muted); font-size: 1.05rem; background: var(--bg-alt); border-radius: var(--radius-md); }
        @media (max-width: 1024px) { .content-grid { grid-template-columns: repeat(2, 1fr); } }
        @media (max-width: 520px) { .content-grid { grid-template-columns: 1fr; } }

        /* ===== Process / Steps ===== */
        .process-steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; position: relative; }
        .process-step { text-align: center; position: relative; }
        .step-num { width: 52px; height: 52px; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 16px; font-size: 1.3rem; font-weight: 800; background: var(--primary); color: var(--text-white); box-shadow: 0 4px 14px rgba(26,86,219,0.3); }
        .process-step h4 { font-size: 1.05rem; font-weight: 700; margin-bottom: 6px; }
        .process-step p { font-size: 0.88rem; color: var(--text-secondary); }
        @media (max-width: 768px) { .process-steps { grid-template-columns: repeat(2, 1fr); gap: 32px 16px; } }
        @media (max-width: 520px) { .process-steps { grid-template-columns: 1fr; } }

        /* ===== FAQ ===== */
        .faq-section { background: var(--bg-alt); }
        .faq-list { max-width: 820px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: var(--bg-card); border-radius: var(--radius-md);
            border: 1px solid var(--border); overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-light); }
        .faq-question {
            display: flex; align-items: center; justify-content: space-between;
            padding: 20px 24px; font-weight: 600; font-size: 1rem;
            color: var(--text-primary); cursor: pointer;
            gap: 16px; transition: background var(--transition);
        }
        .faq-question:hover { background: var(--primary-soft); }
        .faq-question i { color: var(--primary); font-size: 0.9rem; transition: transform var(--transition); flex-shrink: 0; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            max-height: 0; overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            padding: 0 24px;
            color: var(--text-secondary);
            font-size: 0.92rem;
            line-height: 1.7;
        }
        .faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 20px; }
        @media (max-width: 520px) {
            .faq-question { padding: 16px 18px; font-size: 0.92rem; }
            .faq-answer { padding: 0 18px; font-size: 0.85rem; }
            .faq-item.open .faq-answer { padding: 0 18px 16px; }
        }

        /* ===== CTA ===== */
        .cta-section {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            padding: 72px 0;
            text-align: center;
        }
        .cta-section h2 { font-size: 2rem; font-weight: 800; color: var(--text-white); margin-bottom: 12px; }
        .cta-section p { font-size: 1.1rem; color: rgba(255,255,255,0.8); max-width: 600px; margin: 0 auto 28px; }
        .cta-section .btn { background: var(--text-white); color: var(--primary); border-color: var(--text-white); }
        .cta-section .btn:hover { background: var(--secondary); color: #1e293b; border-color: var(--secondary); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
        @media (max-width: 520px) {
            .cta-section { padding: 56px 0; }
            .cta-section h2 { font-size: 1.5rem; }
        }

        /* ===== Footer ===== */
        .site-footer {
            background: #0f172a; color: rgba(255,255,255,0.7);
            padding: 56px 0 24px;
        }
        .footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
        .footer-brand .logo { color: var(--text-white); margin-bottom: 12px; }
        .footer-brand .logo i { color: var(--primary-light); }
        .footer-brand p { font-size: 0.88rem; color: rgba(255,255,255,0.55); max-width: 320px; }
        .footer-col h4 { font-size: 0.95rem; font-weight: 700; color: var(--text-white); margin-bottom: 16px; }
        .footer-col ul li { margin-bottom: 8px; }
        .footer-col ul li a { color: rgba(255,255,255,0.65); font-size: 0.88rem; transition: color var(--transition); }
        .footer-col ul li a:hover { color: var(--primary-light); }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.08);
            padding-top: 20px;
            display: flex; justify-content: space-between; align-items: center;
            flex-wrap: wrap; gap: 12px;
            font-size: 0.82rem;
            color: rgba(255,255,255,0.45);
        }
        .footer-bottom a { color: rgba(255,255,255,0.55); }
        .footer-bottom a:hover { color: var(--primary-light); }
        @media (max-width: 768px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
            .footer-bottom { flex-direction: column; text-align: center; }
        }
        @media (max-width: 520px) {
            .footer-grid { grid-template-columns: 1fr; }
        }

        /* ===== Utilities ===== */
        .mt-0 { margin-top: 0; } .mt-2 { margin-top: 8px; } .mt-4 { margin-top: 16px; } .mt-6 { margin-top: 24px; } .mt-8 { margin-top: 32px; } .mt-10 { margin-top: 40px; }
        .mb-0 { margin-bottom: 0; } .mb-2 { margin-bottom: 8px; } .mb-4 { margin-bottom: 16px; } .mb-6 { margin-bottom: 24px; } .mb-8 { margin-bottom: 32px; }
        .gap-2 { gap: 8px; } .gap-4 { gap: 16px; } .gap-6 { gap: 24px; }
        .flex { display: flex; } .flex-wrap { flex-wrap: wrap; } .items-center { align-items: center; } .justify-between { justify-content: space-between; }
        .w-full { width: 100%; }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

        /* ===== Responsive Fine-tune ===== */
        @media (max-width: 1024px) {
            .header-inner { padding: 0 16px; }
        }

/* roulang page: article */
/* ===== 设计变量 ===== */
:root {
  --primary: #1a56db;
  --primary-dark: #1243af;
  --primary-light: #e8effd;
  --secondary: #0f973d;
  --secondary-dark: #0b7a31;
  --accent: #f59e0b;
  --bg-body: #f8fafc;
  --bg-white: #ffffff;
  --bg-dark: #0f172a;
  --bg-gray: #f1f5f9;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --text-white: #ffffff;
  --border-color: #e2e8f0;
  --border-light: #f1f5f9;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12), 0 4px 16px rgba(0,0,0,0.06);
  --shadow-xl: 0 24px 60px rgba(0,0,0,0.16);
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  --container-max: 1200px;
  --header-height: 72px;
}

/* ===== 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-body); }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--primary-dark); }
a:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: var(--radius-sm); }
button { cursor: pointer; font-family: inherit; border: none; background: none; transition: var(--transition); }
button:focus-visible { outline: 3px solid var(--primary); outline-offset: 2px; border-radius: var(--radius-sm); }
input, textarea { font-family: inherit; font-size: 1rem; border: 1px solid var(--border-color); border-radius: var(--radius-sm); padding: 0.6rem 1rem; transition: var(--transition); background: var(--bg-white); color: var(--text-primary); }
input:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(26,86,219,0.15); outline: none; }
ul, ol { list-style: none; }
h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--text-primary); }
h1 { font-size: 2.4rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.2rem; }
p { margin-bottom: 1rem; color: var(--text-secondary); }
.container { width: 100%; max-width: var(--container-max); margin: 0 auto; padding: 0 20px; }
.section { padding: 80px 0; }
.section-title { font-size: 2rem; text-align: center; margin-bottom: 0.75rem; }
.section-subtitle { text-align: center; color: var(--text-secondary); font-size: 1.1rem; max-width: 640px; margin: 0 auto 3rem; }
.text-center { text-align: center; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* ===== Buttons ===== */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 0.75rem 2rem; font-size: 1rem; font-weight: 600; border-radius: var(--radius-md); transition: var(--transition); border: 2px solid transparent; text-align: center; line-height: 1.4; }
.btn-primary { background: var(--primary); color: var(--text-white); border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); color: var(--text-white); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-primary:active { transform: translateY(0); box-shadow: var(--shadow-sm); }
.btn-secondary { background: var(--secondary); color: var(--text-white); border-color: var(--secondary); }
.btn-secondary:hover { background: var(--secondary-dark); border-color: var(--secondary-dark); color: var(--text-white); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-outline { background: transparent; color: var(--primary); border-color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: var(--text-white); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-sm { padding: 0.5rem 1.2rem; font-size: 0.875rem; border-radius: var(--radius-sm); }
.btn-lg { padding: 1rem 2.8rem; font-size: 1.125rem; border-radius: var(--radius-lg); }

/* ===== Badge / Tag ===== */
.tag { display: inline-flex; align-items: center; padding: 0.25rem 0.75rem; font-size: 0.8rem; font-weight: 500; border-radius: 999px; background: var(--primary-light); color: var(--primary); gap: 4px; }
.tag-sm { padding: 0.15rem 0.5rem; font-size: 0.75rem; }

/* ===== Header & Nav ===== */
.site-header { position: fixed; top: 0; left: 0; right: 0; z-index: 1000; background: rgba(255,255,255,0.92); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px); border-bottom: 1px solid var(--border-color); height: var(--header-height); transition: var(--transition); }
.site-header.scrolled { box-shadow: var(--shadow-md); }
.header-inner { display: flex; align-items: center; justify-content: space-between; height: var(--header-height); }
.logo { display: inline-flex; align-items: center; gap: 10px; font-size: 1.35rem; font-weight: 800; color: var(--text-primary); text-decoration: none; letter-spacing: -0.3px; }
.logo i { color: var(--primary); font-size: 1.6rem; }
.logo:hover { color: var(--primary); }
.logo span { background: linear-gradient(135deg, var(--primary), var(--secondary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-list { display: flex; align-items: center; gap: 6px; }
.nav-list a { display: inline-flex; align-items: center; gap: 6px; padding: 0.5rem 1rem; font-size: 0.95rem; font-weight: 500; color: var(--text-secondary); border-radius: var(--radius-sm); text-decoration: none; transition: var(--transition); }
.nav-list a:hover { color: var(--primary); background: var(--primary-light); }
.nav-list a.active { color: var(--primary); background: var(--primary-light); font-weight: 600; }
.nav-list .nav-cta { padding: 0; margin-left: 8px; }
.nav-list .nav-cta .btn { padding: 0.5rem 1.2rem; font-size: 0.875rem; }
.nav-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; cursor: pointer; background: none; border: none; }
.nav-toggle span { display: block; width: 26px; height: 2.5px; background: var(--text-primary); border-radius: 4px; transition: var(--transition); }
.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== Article Hero ===== */
.article-hero { position: relative; margin-top: var(--header-height); padding: 100px 0 60px; background: linear-gradient(135deg, #0f172a 0%, #1e293b 60%, #0f172a 100%); overflow: hidden; min-height: 320px; display: flex; align-items: center; }
.article-hero::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat; opacity: 0.15; pointer-events: none; }
.article-hero::after { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse at 30% 50%, rgba(26,86,219,0.15) 0%, transparent 70%); pointer-events: none; }
.article-hero .container { position: relative; z-index: 2; }
.article-hero .article-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; margin-bottom: 1.2rem; }
.article-hero .article-meta .tag { background: rgba(255,255,255,0.12); color: var(--text-white); backdrop-filter: blur(4px); }
.article-hero .article-meta span { color: rgba(255,255,255,0.7); font-size: 0.9rem; display: flex; align-items: center; gap: 6px; }
.article-hero .article-meta i { font-size: 0.8rem; }
.article-hero h1 { color: var(--text-white); font-size: 2.6rem; line-height: 1.25; max-width: 900px; text-shadow: 0 2px 20px rgba(0,0,0,0.2); letter-spacing: -0.5px; }
.article-hero .breadcrumb { display: flex; align-items: center; gap: 8px; font-size: 0.85rem; color: rgba(255,255,255,0.6); margin-bottom: 1.5rem; flex-wrap: wrap; }
.article-hero .breadcrumb a { color: rgba(255,255,255,0.7); }
.article-hero .breadcrumb a:hover { color: var(--text-white); }
.article-hero .breadcrumb i { font-size: 0.7rem; color: rgba(255,255,255,0.4); }

/* ===== Article Content ===== */
.article-main { padding: 60px 0 80px; }
.article-layout { display: grid; grid-template-columns: 1fr 300px; gap: 48px; }
.article-body { background: var(--bg-white); border-radius: var(--radius-lg); box-shadow: var(--shadow-sm); padding: 40px; border: 1px solid var(--border-color); }
.article-body .article-content { font-size: 1.05rem; line-height: 1.85; color: var(--text-primary); }
.article-body .article-content h2, .article-body .article-content h3, .article-body .article-content h4 { margin-top: 2rem; margin-bottom: 1rem; color: var(--text-primary); }
.article-body .article-content h2 { font-size: 1.7rem; border-bottom: 2px solid var(--border-light); padding-bottom: 0.5rem; }
.article-body .article-content h3 { font-size: 1.35rem; }
.article-body .article-content p { margin-bottom: 1.2rem; }
.article-body .article-content ul, .article-body .article-content ol { margin-bottom: 1.2rem; padding-left: 1.5rem; }
.article-body .article-content ul { list-style: disc; }
.article-body .article-content ol { list-style: decimal; }
.article-body .article-content li { margin-bottom: 0.4rem; color: var(--text-secondary); }
.article-body .article-content a { color: var(--primary); text-decoration: underline; text-underline-offset: 2px; }
.article-body .article-content a:hover { color: var(--primary-dark); }
.article-body .article-content blockquote { border-left: 4px solid var(--primary); padding: 1rem 1.5rem; margin: 1.5rem 0; background: var(--primary-light); border-radius: 0 var(--radius-sm) var(--radius-sm) 0; color: var(--text-secondary); font-style: italic; }
.article-body .article-content img { border-radius: var(--radius-md); margin: 1.5rem auto; box-shadow: var(--shadow-sm); }
.article-body .article-content code { background: var(--bg-gray); padding: 0.2rem 0.5rem; border-radius: var(--radius-sm); font-size: 0.9em; }
.article-body .article-content pre { background: var(--bg-dark); color: #e2e8f0; padding: 1.5rem; border-radius: var(--radius-md); overflow-x: auto; margin: 1.5rem 0; font-size: 0.9rem; line-height: 1.6; }
.article-body .article-content table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; }
.article-body .article-content th, .article-body .article-content td { border: 1px solid var(--border-color); padding: 0.75rem 1rem; text-align: left; }
.article-body .article-content th { background: var(--bg-gray); font-weight: 600; }
.article-body .article-content hr { margin: 2rem 0; border: none; border-top: 2px solid var(--border-light); }

.article-footer { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border-color); gap: 16px; }
.article-footer .share-links { display: flex; align-items: center; gap: 10px; }
.article-footer .share-links span { font-size: 0.9rem; color: var(--text-secondary); font-weight: 500; }
.article-footer .share-links a { display: flex; align-items: center; justify-content: center; width: 38px; height: 38px; border-radius: 50%; background: var(--bg-gray); color: var(--text-secondary); font-size: 1rem; transition: var(--transition); }
.article-footer .share-links a:hover { background: var(--primary); color: var(--text-white); transform: translateY(-2px); }

/* ===== Sidebar ===== */
.article-sidebar { display: flex; flex-direction: column; gap: 32px; }
.sidebar-card { background: var(--bg-white); border-radius: var(--radius-md); box-shadow: var(--shadow-sm); border: 1px solid var(--border-color); padding: 24px; }
.sidebar-card h3 { font-size: 1.1rem; margin-bottom: 1rem; padding-bottom: 0.75rem; border-bottom: 2px solid var(--border-light); display: flex; align-items: center; gap: 8px; }
.sidebar-card h3 i { color: var(--primary); }
.sidebar-card ul li { margin-bottom: 0.6rem; }
.sidebar-card ul li a { color: var(--text-secondary); font-size: 0.95rem; display: block; padding: 0.4rem 0; transition: var(--transition); }
.sidebar-card ul li a:hover { color: var(--primary); padding-left: 4px; }
.sidebar-cta { background: linear-gradient(135deg, var(--primary), #1e3a8a); color: var(--text-white); padding: 28px 24px; border-radius: var(--radius-md); text-align: center; }
.sidebar-cta h4 { color: var(--text-white); font-size: 1.15rem; margin-bottom: 0.75rem; }
.sidebar-cta p { color: rgba(255,255,255,0.8); font-size: 0.9rem; margin-bottom: 1.2rem; }
.sidebar-cta .btn { background: var(--text-white); color: var(--primary); }
.sidebar-cta .btn:hover { background: var(--primary-light); transform: translateY(-2px); box-shadow: var(--shadow-md); }

/* ===== Related Section ===== */
.related-section { background: var(--bg-white); border-top: 1px solid var(--border-color); padding: 70px 0; }
.related-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.related-card { background: var(--bg-body); border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--border-color); transition: var(--transition); }
.related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: transparent; }
.related-card .card-img { aspect-ratio: 16/9; overflow: hidden; background: var(--bg-gray); }
.related-card .card-img img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
.related-card:hover .card-img img { transform: scale(1.05); }
.related-card .card-body { padding: 20px; }
.related-card .card-body .tag { margin-bottom: 0.5rem; }
.related-card .card-body h4 { font-size: 1.05rem; margin-bottom: 0.5rem; line-height: 1.4; }
.related-card .card-body h4 a { color: var(--text-primary); }
.related-card .card-body h4 a:hover { color: var(--primary); }
.related-card .card-body p { font-size: 0.9rem; color: var(--text-muted); margin-bottom: 0; }

/* ===== CTA Section ===== */
.cta-section { padding: 80px 0; background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%); position: relative; overflow: hidden; }
.cta-section::before { content: ''; position: absolute; inset: 0; background: url('/assets/images/backpic/back-2.webp') center/cover no-repeat; opacity: 0.08; pointer-events: none; }
.cta-section .container { position: relative; z-index: 2; text-align: center; }
.cta-section h2 { color: var(--text-white); font-size: 2.2rem; margin-bottom: 1rem; }
.cta-section p { color: rgba(255,255,255,0.75); font-size: 1.1rem; max-width: 600px; margin: 0 auto 2rem; }
.cta-section .btn-group { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; }
.cta-section .btn-primary { background: var(--text-white); color: var(--primary); border-color: var(--text-white); }
.cta-section .btn-primary:hover { background: var(--primary-light); color: var(--primary-dark); border-color: var(--primary-light); }
.cta-section .btn-outline { color: var(--text-white); border-color: rgba(255,255,255,0.4); }
.cta-section .btn-outline:hover { background: rgba(255,255,255,0.1); border-color: var(--text-white); }

/* ===== Footer ===== */
.site-footer { background: #0b1120; color: rgba(255,255,255,0.7); padding: 60px 0 0; }
.site-footer .logo { color: var(--text-white); margin-bottom: 1rem; }
.site-footer .logo span { -webkit-text-fill-color: var(--text-white); }
.site-footer .logo i { color: var(--primary); }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { font-size: 0.9rem; color: rgba(255,255,255,0.6); line-height: 1.7; max-width: 360px; }
.footer-col h4 { color: var(--text-white); font-size: 0.95rem; font-weight: 600; margin-bottom: 1.2rem; letter-spacing: 0.5px; }
.footer-col ul li { margin-bottom: 0.6rem; }
.footer-col ul li a { color: rgba(255,255,255,0.6); font-size: 0.9rem; transition: var(--transition); }
.footer-col ul li a:hover { color: var(--text-white); padding-left: 3px; }
.footer-bottom { border-top: 1px solid rgba(255,255,255,0.08); padding: 24px 0; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 12px; font-size: 0.85rem; color: rgba(255,255,255,0.5); }
.footer-bottom a { color: rgba(255,255,255,0.6); }
.footer-bottom a:hover { color: var(--text-white); }

/* ===== Not Found ===== */
.not-found { text-align: center; padding: 80px 20px; }
.not-found i { font-size: 4rem; color: var(--text-muted); margin-bottom: 1.5rem; }
.not-found h2 { font-size: 1.8rem; margin-bottom: 1rem; }
.not-found p { color: var(--text-secondary); margin-bottom: 2rem; }

/* ===== Mobile Nav ===== */
@media (max-width: 1024px) {
  .article-layout { grid-template-columns: 1fr; }
  .article-sidebar { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
  .related-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .article-hero h1 { font-size: 2.2rem; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }
  .nav-list { position: fixed; top: var(--header-height); left: 0; right: 0; background: var(--bg-white); flex-direction: column; padding: 16px 20px; gap: 4px; box-shadow: var(--shadow-lg); transform: translateY(-120%); opacity: 0; pointer-events: none; transition: var(--transition); border-bottom: 2px solid var(--border-color); max-height: 80vh; overflow-y: auto; }
  .nav-list.open { transform: translateY(0); opacity: 1; pointer-events: all; }
  .nav-list a { width: 100%; padding: 0.75rem 1rem; font-size: 1rem; }
  .nav-list .nav-cta { width: 100%; margin-left: 0; margin-top: 8px; }
  .nav-list .nav-cta .btn { width: 100%; justify-content: center; }
  .article-hero { padding: 80px 0 40px; min-height: 240px; }
  .article-hero h1 { font-size: 1.8rem; }
  .article-hero .breadcrumb { font-size: 0.8rem; }
  .article-body { padding: 24px 20px; }
  .article-body .article-content { font-size: 1rem; }
  .article-sidebar { grid-template-columns: 1fr; }
  .related-grid { grid-template-columns: 1fr; max-width: 480px; margin: 0 auto; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }
  .section { padding: 50px 0; }
  .section-title { font-size: 1.6rem; }
  .cta-section h2 { font-size: 1.7rem; }
  .btn-lg { padding: 0.85rem 2rem; font-size: 1rem; }
  .article-footer { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 520px) {
  .article-hero h1 { font-size: 1.5rem; }
  .article-hero .article-meta { gap: 8px 14px; }
  .article-hero .article-meta span { font-size: 0.8rem; }
  .article-body { padding: 18px 14px; }
  .container { padding: 0 14px; }
  .related-card .card-body { padding: 16px; }
  .sidebar-card { padding: 18px; }
}

/* ===== Accessibility ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
  html { scroll-behavior: auto; }
}

/* ===== Selection ===== */
::selection { background: var(--primary); color: var(--text-white); }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #1a3a6b;
            --primary-light: #2a5a9e;
            --primary-dark: #0f2445;
            --accent: #e8a838;
            --accent-light: #f0c060;
            --accent-dark: #c98a20;
            --bg-light: #f7f9fc;
            --bg-white: #ffffff;
            --bg-dark: #0f1a2e;
            --text-primary: #1a2a3a;
            --text-secondary: #4a5a6a;
            --text-light: #7a8a9a;
            --text-white: #f0f4f8;
            --border: #dce4ec;
            --radius: 12px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(0,0,0,0.06);
            --shadow: 0 8px 30px rgba(0,0,0,0.08);
            --shadow-lg: 0 20px 50px rgba(0,0,0,0.12);
            --transition: 0.3s ease;
            --font: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --max-width: 1200px;
            --nav-height: 72px;
        }

        /* ===== Reset & Base ===== */
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; }
        body {
            font-family: var(--font);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-light);
            -webkit-font-smoothing: antialiased;
        }
        a { color: inherit; text-decoration: none; transition: color var(--transition); }
        img { max-width: 100%; height: auto; display: block; }
        button, input, textarea { font-family: inherit; font-size: 1rem; outline: none; border: none; }
        ul, ol { list-style: none; }
        h1, h2, h3, h4, h5, h6 { line-height: 1.3; font-weight: 700; color: var(--primary-dark); }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* ===== 导航 ===== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(255,255,255,0.97);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border);
            height: var(--nav-height);
            display: flex;
            align-items: center;
            box-shadow: 0 1px 4px rgba(0,0,0,0.04);
        }
        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.35rem;
            font-weight: 800;
            color: var(--primary);
            letter-spacing: -0.3px;
        }
        .logo i { font-size: 1.6rem; color: var(--accent); }
        .logo span { background: linear-gradient(135deg, var(--primary-dark), var(--primary-light)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        .nav-list {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .nav-list a {
            padding: 8px 18px;
            border-radius: 30px;
            font-size: 0.94rem;
            font-weight: 500;
            color: var(--text-secondary);
            transition: all var(--transition);
            display: flex;
            align-items: center;
            gap: 6px;
            white-space: nowrap;
        }
        .nav-list a i { font-size: 0.85rem; }
        .nav-list a:hover { background: rgba(26,58,107,0.06); color: var(--primary); }
        .nav-list a.active { background: var(--primary); color: #fff; box-shadow: 0 4px 12px rgba(26,58,107,0.25); }
        .nav-list a.active i { color: var(--accent); }
        .nav-cta { margin-left: 8px; }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 10px 26px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            cursor: pointer;
            border: none;
            line-height: 1.4;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: var(--primary-dark);
            box-shadow: 0 4px 14px rgba(232,168,56,0.35);
        }
        .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,168,56,0.45); }
        .btn-primary:active { transform: translateY(0); }
        .btn-outline {
            background: transparent;
            border: 2px solid var(--primary);
            color: var(--primary);
        }
        .btn-outline:hover { background: var(--primary); color: #fff; transform: translateY(-2px); }
        .btn-lg { padding: 14px 38px; font-size: 1.05rem; border-radius: 36px; }
        .btn-sm { padding: 7px 18px; font-size: 0.85rem; border-radius: 24px; }
        .nav-toggle { display: none; background: none; font-size: 1.6rem; color: var(--primary); cursor: pointer; padding: 4px; }

        /* ===== Hero ===== */
        .hero-cat {
            position: relative;
            padding: 100px 0 80px;
            background: var(--bg-dark);
            overflow: hidden;
            min-height: 480px;
            display: flex;
            align-items: center;
        }
        .hero-cat-bg {
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.webp') center center / cover no-repeat;
            opacity: 0.25;
            filter: saturate(0.7);
        }
        .hero-cat-overlay {
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,26,46,0.88) 0%, rgba(26,58,107,0.70) 100%);
        }
        .hero-cat .container {
            position: relative;
            z-index: 2;
            text-align: center;
            max-width: 820px;
        }
        .hero-cat-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(232,168,56,0.18);
            color: var(--accent-light);
            padding: 6px 20px;
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 24px;
            border: 1px solid rgba(232,168,56,0.25);
        }
        .hero-cat h1 {
            font-size: 3rem;
            color: #fff;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero-cat h1 span { color: var(--accent); }
        .hero-cat p {
            font-size: 1.15rem;
            color: rgba(255,255,255,0.8);
            max-width: 680px;
            margin: 0 auto 36px;
            line-height: 1.8;
        }
        .hero-cat-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
        .hero-cat-actions .btn-primary { background: var(--accent); color: var(--primary-dark); }
        .hero-cat-actions .btn-outline { border-color: rgba(255,255,255,0.6); color: #fff; }
        .hero-cat-actions .btn-outline:hover { background: rgba(255,255,255,0.12); border-color: #fff; }

        /* ===== 通用板块 ===== */
        .section { padding: 80px 0; }
        .section-alt { background: var(--bg-white); }
        .section-dark { background: var(--bg-dark); color: var(--text-white); }
        .section-title {
            text-align: center;
            margin-bottom: 48px;
        }
        .section-title h2 {
            font-size: 2.2rem;
            color: var(--primary-dark);
            margin-bottom: 12px;
        }
        .section-title p {
            color: var(--text-secondary);
            font-size: 1.05rem;
            max-width: 600px;
            margin: 0 auto;
        }
        .section-dark .section-title h2 { color: #fff; }
        .section-dark .section-title p { color: rgba(255,255,255,0.7); }

        /* ===== 核心优势卡片 ===== */
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 32px; }
        .card {
            background: var(--bg-white);
            border-radius: var(--radius);
            padding: 32px 24px;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--border);
        }
        .card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
        .card-icon {
            width: 56px;
            height: 56px;
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: #fff;
            margin-bottom: 18px;
            background: var(--primary);
        }
        .card-icon.alt { background: var(--accent); color: var(--primary-dark); }
        .card h3 { font-size: 1.2rem; margin-bottom: 10px; color: var(--primary-dark); }
        .card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; }

        /* ===== 认证方式 ===== */
        .method-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
        .method-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: all var(--transition);
            border: 1px solid var(--border);
            text-align: center;
        }
        .method-card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
        .method-card-img {
            height: 160px;
            background: var(--bg-light);
            display: flex;
            align-items: center;
            justify-content: center;
            overflow: hidden;
        }
        .method-card-img img { width: 100%; height: 100%; object-fit: cover; }
        .method-card-body { padding: 20px 16px 24px; }
        .method-card-body h4 { font-size: 1.1rem; margin-bottom: 6px; }
        .method-card-body p { font-size: 0.9rem; color: var(--text-secondary); }

        /* ===== 场景 ===== */
        .scene-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
        .scene-card {
            display: flex;
            gap: 20px;
            background: var(--bg-white);
            border-radius: var(--radius);
            padding: 28px 24px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: all var(--transition);
            align-items: flex-start;
        }
        .scene-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
        .scene-icon {
            flex-shrink: 0;
            width: 52px;
            height: 52px;
            border-radius: 14px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            color: #fff;
            background: var(--primary-light);
        }
        .scene-icon.alt { background: var(--accent); color: var(--primary-dark); }
        .scene-card h4 { font-size: 1.1rem; margin-bottom: 6px; }
        .scene-card p { font-size: 0.93rem; color: var(--text-secondary); line-height: 1.7; }

        /* ===== 流程 ===== */
        .flow-wrapper {
            display: flex;
            justify-content: space-between;
            gap: 16px;
            position: relative;
            flex-wrap: wrap;
        }
        .flow-step {
            flex: 1;
            min-width: 160px;
            text-align: center;
            position: relative;
            background: var(--bg-white);
            border-radius: var(--radius);
            padding: 30px 16px;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
        }
        .flow-step:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
        .flow-num {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #fff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            font-weight: 700;
            margin: 0 auto 14px;
        }
        .flow-step h4 { font-size: 1.05rem; margin-bottom: 6px; }
        .flow-step p { font-size: 0.9rem; color: var(--text-secondary); }
        .flow-arrow {
            display: flex;
            align-items: center;
            font-size: 1.5rem;
            color: var(--accent);
            padding: 0 4px;
            flex-shrink: 0;
        }

        /* ===== FAQ ===== */
        .faq-list { max-width: 760px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: all var(--transition);
        }
        .faq-item:hover { border-color: var(--primary-light); }
        .faq-question {
            padding: 18px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            color: var(--primary-dark);
            background: none;
            width: 100%;
            text-align: left;
            gap: 16px;
        }
        .faq-question i { color: var(--accent); transition: transform var(--transition); font-size: 1rem; }
        .faq-item.open .faq-question i { transform: rotate(180deg); }
        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.8;
        }
        .faq-item.open .faq-answer { max-height: 300px; padding: 0 24px 20px; }

        /* ===== CTA ===== */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.webp') center center / cover no-repeat;
            opacity: 0.10;
        }
        .cta-section .container { position: relative; z-index: 2; }
        .cta-section h2 { font-size: 2.2rem; color: #fff; margin-bottom: 14px; }
        .cta-section p { color: rgba(255,255,255,0.8); font-size: 1.1rem; max-width: 560px; margin: 0 auto 32px; }
        .cta-section .btn-primary { background: var(--accent); color: var(--primary-dark); font-size: 1.05rem; padding: 14px 40px; }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.7);
            padding: 60px 0 30px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 36px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .logo { color: #fff; margin-bottom: 14px; }
        .footer-brand .logo span { -webkit-text-fill-color: #fff; background: none; }
        .footer-brand .logo i { color: var(--accent); }
        .footer-brand p { font-size: 0.9rem; line-height: 1.8; max-width: 340px; }
        .footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 16px; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { font-size: 0.9rem; color: rgba(255,255,255,0.6); transition: all var(--transition); display: flex; align-items: center; gap: 6px; }
        .footer-col ul li a:hover { color: var(--accent); padding-left: 4px; }
        .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 12px;
            padding-top: 24px;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.5);
        }
        .footer-bottom a { color: var(--accent); }
        .footer-bottom a:hover { text-decoration: underline; }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
            .method-grid { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
        }
        @media (max-width: 768px) {
            .nav-toggle { display: block; }
            .nav-list {
                position: fixed;
                top: var(--nav-height);
                left: 0;
                right: 0;
                background: rgba(255,255,255,0.98);
                backdrop-filter: blur(12px);
                flex-direction: column;
                padding: 20px 24px;
                border-bottom: 1px solid var(--border);
                box-shadow: var(--shadow-lg);
                transform: translateY(-120%);
                opacity: 0;
                transition: all 0.4s ease;
                pointer-events: none;
                gap: 8px;
            }
            .nav-list.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
            .nav-list a { width: 100%; justify-content: center; padding: 12px 18px; }
            .nav-cta { margin-left: 0; width: 100; }
            .nav-cta .btn { width: 100%; justify-content: center; }
            .hero-cat h1 { font-size: 2.2rem; }
            .hero-cat p { font-size: 1rem; }
            .section-title h2 { font-size: 1.8rem; }
            .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; gap: 20px; }
            .method-grid { grid-template-columns: 1fr; }
            .scene-grid { grid-template-columns: 1fr; }
            .flow-wrapper { flex-direction: column; align-items: center; }
            .flow-step { width: 100%; max-width: 360px; }
            .flow-arrow { transform: rotate(90deg); padding: 8px 0; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-section h2 { font-size: 1.7rem; }
        }
        @media (max-width: 520px) {
            .hero-cat { padding: 70px 0 50px; min-height: auto; }
            .hero-cat h1 { font-size: 1.7rem; }
            .hero-cat p { font-size: 0.92rem; }
            .section { padding: 50px 0; }
            .section-title { margin-bottom: 32px; }
            .card { padding: 24px 18px; }
            .scene-card { flex-direction: column; align-items: flex-start; }
            .method-card-img { height: 120px; }
            .faq-question { padding: 14px 16px; font-size: 0.95rem; }
            .faq-answer { font-size: 0.9rem; }
        }

        /* ===== 辅助 ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 4px;
            padding: 3px 12px;
            border-radius: 20px;
            font-size: 0.78rem;
            font-weight: 500;
            background: rgba(26,58,107,0.08);
            color: var(--primary);
        }
        .badge-accent { background: rgba(232,168,56,0.15); color: var(--accent-dark); }
        .mt-24 { margin-top: 24px; }
        .mb-24 { margin-bottom: 24px; }
        .text-center { text-align: center; }