/* roulang page: index */
/* ========== Design Variables ========== */
        :root {
            --primary: #1a3c5e;
            --primary-light: #2a5a8a;
            --primary-dark: #0f2a42;
            --secondary: #e8b84b;
            --secondary-light: #f0d080;
            --accent: #3a9d8c;
            --bg-light: #f8fafc;
            --bg-dark: #0f1a2e;
            --bg-card: #ffffff;
            --text-primary: #1a2a3a;
            --text-secondary: #4a5a6a;
            --text-light: #8a9aaa;
            --text-white: #f0f4f8;
            --border: #e2e8f0;
            --border-light: #f0f4f8;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow: 0 4px 24px rgba(26, 60, 94, 0.08);
            --shadow-hover: 0 12px 40px rgba(26, 60, 94, 0.15);
            --shadow-dark: 0 8px 32px rgba(15, 26, 46, 0.25);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            --nav-width: 260px;
            --header-height: 72px;
        }

        /* ========== 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-sans);
            color: var(--text-primary);
            background: var(--bg-light);
            line-height: 1.7;
            font-size: 16px;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        img { max-width: 100%; height: auto; display: block; }
        a { color: var(--primary); text-decoration: none; transition: var(--transition); }
        a:hover { color: var(--primary-light); }
        ul, ol { list-style: none; }
        button, input, textarea { font-family: inherit; font-size: inherit; outline: none; }
        .container { max-width: 1200px; margin: 0 auto; padding: 0 24px; width: 100%; }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 0.75rem;
            letter-spacing: -0.02em;
            line-height: 1.3;
        }
        .section-subtitle {
            font-size: 1.1rem;
            color: var(--text-secondary);
            max-width: 680px;
            margin-bottom: 2.5rem;
            line-height: 1.6;
        }
        .section-divider {
            width: 60px;
            height: 4px;
            background: var(--secondary);
            border-radius: 4px;
            margin-bottom: 1.5rem;
        }
        .text-center { text-align: center; }
        .text-center .section-divider { margin-left: auto; margin-right: auto; }
        .text-center .section-subtitle { margin-left: auto; margin-right: auto; }

        /* ========== Left Sidebar Navigation ========== */
        .site-wrapper {
            display: flex;
            min-height: 100vh;
        }
        .sidebar {
            width: var(--nav-width);
            background: var(--bg-dark);
            color: var(--text-white);
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            z-index: 1000;
            display: flex;
            flex-direction: column;
            padding: 2rem 1.5rem;
            transition: transform var(--transition), opacity var(--transition);
            overflow-y: auto;
            border-right: 1px solid rgba(255,255,255,0.06);
        }
        .sidebar-brand {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding-bottom: 2rem;
            border-bottom: 1px solid rgba(255,255,255,0.08);
            margin-bottom: 1.5rem;
        }
        .sidebar-brand .brand-icon {
            width: 44px;
            height: 44px;
            background: var(--secondary);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            color: var(--bg-dark);
            font-weight: 800;
            flex-shrink: 0;
        }
        .sidebar-brand .brand-text {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-white);
            line-height: 1.3;
            letter-spacing: 0.02em;
        }
        .sidebar-nav {
            display: flex;
            flex-direction: column;
            gap: 0.25rem;
            flex: 1;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            padding: 0.75rem 1rem;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.7);
            font-weight: 500;
            font-size: 0.95rem;
            transition: var(--transition);
        }
        .sidebar-nav a i { width: 20px; text-align: center; font-size: 1rem; opacity: 0.8; }
        .sidebar-nav a:hover, .sidebar-nav a.active {
            background: rgba(255,255,255,0.08);
            color: var(--text-white);
        }
        .sidebar-nav a.active { background: rgba(232, 184, 75, 0.15); color: var(--secondary); }
        .sidebar-footer {
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255,255,255,0.06);
            font-size: 0.8rem;
            color: rgba(255,255,255,0.35);
            text-align: center;
        }

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

        /* ========== Mobile Header ========== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: var(--bg-dark);
            z-index: 1001;
            padding: 0 20px;
            align-items: center;
            justify-content: space-between;
            border-bottom: 1px solid rgba(255,255,255,0.06);
        }
        .mobile-header .brand-text {
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-white);
        }
        .mobile-header .brand-icon {
            width: 36px;
            height: 36px;
            background: var(--secondary);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            color: var(--bg-dark);
            font-weight: 800;
        }
        .menu-toggle {
            background: none;
            border: none;
            color: var(--text-white);
            font-size: 1.5rem;
            cursor: pointer;
            padding: 8px;
            border-radius: 8px;
            transition: var(--transition);
        }
        .menu-toggle:hover { background: rgba(255,255,255,0.08); }
        .sidebar-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0,0,0,0.5);
            z-index: 999;
            backdrop-filter: blur(4px);
        }
        .sidebar-overlay.active { display: block; }

        /* ========== Hero Section ========== */
        .hero {
            background: var(--bg-dark);
            color: var(--text-white);
            padding: 100px 0 80px;
            position: relative;
            overflow: hidden;
            min-height: 520px;
            display: flex;
            align-items: center;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-1.png') center center / cover no-repeat;
            opacity: 0.25;
            z-index: 0;
        }
        .hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(135deg, rgba(15,26,46,0.92) 0%, rgba(26,60,94,0.7) 100%);
            z-index: 1;
        }
        .hero .container { position: relative; z-index: 2; }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(232, 184, 75, 0.15);
            color: var(--secondary);
            padding: 0.4rem 1rem;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 1.5rem;
            border: 1px solid rgba(232,184,75,0.2);
        }
        .hero h1 {
            font-size: 3.2rem;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.03em;
            margin-bottom: 1.25rem;
            max-width: 800px;
        }
        .hero h1 span { color: var(--secondary); }
        .hero p {
            font-size: 1.2rem;
            color: rgba(255,255,255,0.75);
            max-width: 640px;
            margin-bottom: 2rem;
            line-height: 1.7;
        }
        .hero-actions {
            display: flex;
            gap: 1rem;
            flex-wrap: wrap;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.8rem 2rem;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            border: none;
            cursor: pointer;
            transition: var(--transition);
            text-decoration: none;
        }
        .btn-primary {
            background: var(--secondary);
            color: var(--bg-dark);
        }
        .btn-primary:hover { background: var(--secondary-light); color: var(--bg-dark); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(232,184,75,0.3); }
        .btn-outline {
            background: transparent;
            color: var(--text-white);
            border: 2px solid rgba(255,255,255,0.25);
        }
        .btn-outline:hover { border-color: var(--secondary); color: var(--secondary); transform: translateY(-2px); }

        /* ========== Stats Section ========== */
        .stats {
            padding: 60px 0;
            background: var(--bg-card);
            border-bottom: 1px solid var(--border);
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 2rem;
        }
        .stat-item {
            text-align: center;
            padding: 1.5rem 1rem;
        }
        .stat-number {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.2;
            margin-bottom: 0.4rem;
            letter-spacing: -0.03em;
        }
        .stat-label {
            font-size: 0.95rem;
            color: var(--text-secondary);
            font-weight: 500;
        }
        .stat-item .stat-icon {
            font-size: 2rem;
            color: var(--secondary);
            margin-bottom: 0.75rem;
        }

        /* ========== Features / Services ========== */
        .features {
            padding: 80px 0;
            background: var(--bg-light);
        }
        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        .feature-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 2rem 1.75rem;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid var(--border-light);
        }
        .feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
        .feature-card .icon {
            width: 56px;
            height: 56px;
            background: rgba(26, 60, 94, 0.06);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.6rem;
            color: var(--primary);
            margin-bottom: 1.25rem;
            transition: var(--transition);
        }
        .feature-card:hover .icon { background: var(--primary); color: var(--text-white); }
        .feature-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 0.6rem;
            color: var(--text-primary);
        }
        .feature-card p {
            font-size: 0.95rem;
            color: var(--text-secondary);
            line-height: 1.6;
        }

        /* ========== Categories / 分类入口 ========== */
        .categories {
            padding: 80px 0;
            background: var(--bg-card);
        }
        .categories-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.5rem;
        }
        .category-card {
            position: relative;
            border-radius: var(--radius);
            overflow: hidden;
            min-height: 240px;
            display: flex;
            align-items: flex-end;
            padding: 1.5rem;
            background: var(--bg-dark);
            transition: var(--transition);
            cursor: pointer;
            text-decoration: none;
        }
        .category-card::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(0deg, rgba(15,26,46,0.85) 0%, rgba(15,26,46,0.2) 100%);
            z-index: 1;
            transition: var(--transition);
        }
        .category-card .cover {
            position: absolute;
            inset: 0;
            object-fit: cover;
            width: 100%;
            height: 100%;
            transition: var(--transition);
        }
        .category-card:hover .cover { transform: scale(1.05); }
        .category-card .content {
            position: relative;
            z-index: 2;
            color: var(--text-white);
        }
        .category-card .content h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 0.3rem;
        }
        .category-card .content p {
            font-size: 0.9rem;
            opacity: 0.8;
            margin-bottom: 0.6rem;
        }
        .category-card .tag {
            display: inline-block;
            background: var(--secondary);
            color: var(--bg-dark);
            font-size: 0.75rem;
            font-weight: 700;
            padding: 0.2rem 0.8rem;
            border-radius: 50px;
        }

        /* ========== Latest News / CMS List ========== */
        .latest-news {
            padding: 80px 0;
            background: var(--bg-light);
        }
        .news-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
        }
        .news-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: var(--transition);
            border: 1px solid var(--border-light);
            display: flex;
            flex-direction: column;
        }
        .news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); }
        .news-card .thumb {
            width: 100%;
            height: 200px;
            object-fit: cover;
            display: block;
            background: var(--border);
        }
        .news-card .body {
            padding: 1.5rem;
            flex: 1;
            display: flex;
            flex-direction: column;
        }
        .news-card .meta {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            font-size: 0.82rem;
            color: var(--text-light);
            margin-bottom: 0.6rem;
        }
        .news-card .meta .cat {
            background: rgba(26, 60, 94, 0.08);
            color: var(--primary);
            padding: 0.15rem 0.6rem;
            border-radius: 4px;
            font-weight: 600;
            font-size: 0.75rem;
        }
        .news-card .meta .date { display: flex; align-items: center; gap: 0.3rem; }
        .news-card h3 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.5rem;
            line-height: 1.4;
            color: var(--text-primary);
        }
        .news-card h3 a { color: inherit; }
        .news-card h3 a:hover { color: var(--primary); }
        .news-card .excerpt {
            font-size: 0.92rem;
            color: var(--text-secondary);
            line-height: 1.6;
            flex: 1;
        }
        .news-card .read-more {
            margin-top: 1rem;
            font-weight: 600;
            color: var(--primary);
            font-size: 0.9rem;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }
        .news-card .read-more:hover { color: var(--primary-light); gap: 0.7rem; }
        .empty-news {
            grid-column: 1 / -1;
            text-align: center;
            padding: 3rem 1rem;
            color: var(--text-light);
            font-size: 1.05rem;
            background: var(--bg-card);
            border-radius: var(--radius);
            border: 1px dashed var(--border);
        }

        /* ========== Process / 流程 ========== */
        .process {
            padding: 80px 0;
            background: var(--bg-dark);
            color: var(--text-white);
            position: relative;
            overflow: hidden;
        }
        .process::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-2.png') center center / cover no-repeat;
            opacity: 0.1;
            z-index: 0;
        }
        .process .container { position: relative; z-index: 1; }
        .process .section-title { color: var(--text-white); }
        .process .section-subtitle { color: rgba(255,255,255,0.6); }
        .process .section-divider { background: var(--secondary); }
        .process-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 1.5rem;
            margin-top: 2rem;
        }
        .process-step {
            text-align: center;
            padding: 1.5rem 1rem;
            position: relative;
        }
        .process-step .step-num {
            width: 48px;
            height: 48px;
            background: var(--secondary);
            color: var(--bg-dark);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 1.2rem;
            margin: 0 auto 1rem;
        }
        .process-step h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 0.4rem;
            color: var(--text-white);
        }
        .process-step p {
            font-size: 0.9rem;
            color: rgba(255,255,255,0.6);
            line-height: 1.5;
        }
        .process-step::after {
            content: '→';
            position: absolute;
            right: -1rem;
            top: 2rem;
            font-size: 1.5rem;
            color: var(--secondary);
            opacity: 0.5;
        }
        .process-step:last-child::after { display: none; }

        /* ========== FAQ ========== */
        .faq {
            padding: 80px 0;
            background: var(--bg-card);
        }
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
        }
        .faq-item {
            background: var(--bg-light);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border-light);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item summary {
            padding: 1.25rem 1.5rem;
            font-weight: 600;
            font-size: 1rem;
            color: var(--text-primary);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            list-style: none;
            transition: var(--transition);
        }
        .faq-item summary::-webkit-details-marker { display: none; }
        .faq-item summary::after {
            content: '\f078';
            font-family: 'Font Awesome 6 Free';
            font-weight: 900;
            font-size: 0.8rem;
            color: var(--text-light);
            transition: var(--transition);
        }
        .faq-item[open] summary::after { transform: rotate(180deg); color: var(--secondary); }
        .faq-item[open] summary { color: var(--primary); background: rgba(26,60,94,0.03); }
        .faq-item .answer {
            padding: 0 1.5rem 1.25rem;
            color: var(--text-secondary);
            font-size: 0.95rem;
            line-height: 1.7;
        }

        /* ========== CTA ========== */
        .cta {
            padding: 80px 0;
            background: var(--primary);
            color: var(--text-white);
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .cta::before {
            content: '';
            position: absolute;
            inset: 0;
            background: url('/assets/images/backpic/back-3.png') center center / cover no-repeat;
            opacity: 0.08;
            z-index: 0;
        }
        .cta .container { position: relative; z-index: 1; }
        .cta h2 {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 1rem;
            letter-spacing: -0.02em;
        }
        .cta p {
            font-size: 1.1rem;
            opacity: 0.85;
            max-width: 600px;
            margin: 0 auto 2rem;
        }
        .cta .btn-primary { background: var(--secondary); color: var(--bg-dark); font-size: 1.05rem; padding: 0.9rem 2.5rem; }
        .cta .btn-primary:hover { background: var(--secondary-light); transform: translateY(-3px); box-shadow: 0 12px 32px rgba(0,0,0,0.3); }

        /* ========== Footer ========== */
        .site-footer {
            background: var(--bg-dark);
            color: rgba(255,255,255,0.6);
            padding: 48px 0 32px;
            border-top: 1px solid rgba(255,255,255,0.05);
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 2rem;
            margin-bottom: 2rem;
        }
        .footer-brand .brand-text {
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 0.5rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .footer-brand .brand-text .icon {
            width: 32px;
            height: 32px;
            background: var(--secondary);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1rem;
            color: var(--bg-dark);
            font-weight: 800;
        }
        .footer-brand p { font-size: 0.9rem; max-width: 320px; line-height: 1.6; color: rgba(255,255,255,0.5); }
        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-white);
            margin-bottom: 1rem;
        }
        .footer-col ul li { margin-bottom: 0.5rem; }
        .footer-col ul li a {
            color: rgba(255,255,255,0.5);
            font-size: 0.9rem;
            transition: var(--transition);
        }
        .footer-col ul li a:hover { color: var(--secondary); padding-left: 4px; }
        .footer-bottom {
            border-top: 1px solid rgba(255,255,255,0.06);
            padding-top: 1.5rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-size: 0.85rem;
            color: rgba(255,255,255,0.35);
            flex-wrap: wrap;
            gap: 1rem;
        }
        .footer-bottom .links { display: flex; gap: 1.5rem; }
        .footer-bottom .links a { color: rgba(255,255,255,0.35); }
        .footer-bottom .links a:hover { color: var(--secondary); }

        /* ========== Responsive ========== */
        @media screen and (max-width: 1024px) {
            .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 1rem; }
            .features-grid { grid-template-columns: repeat(2, 1fr); }
            .categories-grid { grid-template-columns: repeat(2, 1fr); }
            .process-grid { grid-template-columns: repeat(2, 1fr); }
            .process-step::after { display: none; }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
        }

        @media screen and (max-width: 768px) {
            .sidebar { transform: translateX(-100%); }
            .sidebar.open { transform: translateX(0); }
            .mobile-header { display: flex; }
            .main-content { margin-left: 0; padding-top: var(--header-height); }
            .hero { padding: 60px 0 50px; min-height: auto; }
            .hero h1 { font-size: 2rem; }
            .hero p { font-size: 1rem; }
            .section-title { font-size: 1.6rem; }
            .features-grid { grid-template-columns: 1fr; }
            .categories-grid { grid-template-columns: 1fr; }
            .news-grid { grid-template-columns: 1fr; }
            .process-grid { grid-template-columns: 1fr; gap: 1rem; }
            .stats-grid { grid-template-columns: 1fr 1fr; gap: 0.5rem; }
            .stat-number { font-size: 2rem; }
            .footer-grid { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta h2 { font-size: 1.6rem; }
            .hero-actions { flex-direction: column; align-items: flex-start; }
            .btn { width: 100%; justify-content: center; }
        }

        @media screen and (max-width: 520px) {
            .hero h1 { font-size: 1.6rem; }
            .stats-grid { grid-template-columns: 1fr 1fr; }
            .stat-number { font-size: 1.6rem; }
            .container { padding: 0 16px; }
            .feature-card { padding: 1.5rem; }
            .category-card { min-height: 180px; }
            .news-card .thumb { height: 160px; }
        }

        /* ========== Accessibility & Utilities ========== */
        :focus-visible { outline: 2px solid var(--secondary); outline-offset: 2px; }
        .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* roulang page: category1 */
/* ===== 设计变量 ===== */
        :root {
            --primary: #0d47a1;
            --primary-dark: #0a2e6e;
            --primary-light: #1565c0;
            --accent: #00bcd4;
            --accent-light: #4fc3f7;
            --accent-dark: #0097a7;
            --bg-white: #ffffff;
            --bg-light: #f0f4f8;
            --bg-dark: #0a1a2e;
            --text-dark: #1a1a2e;
            --text-body: #2d3748;
            --text-muted: #6b7a8f;
            --text-light: #a0b4c8;
            --border: #e2e8f0;
            --border-light: #f0f4f8;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 20px;
            --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
            --shadow-md: 0 8px 30px rgba(0, 0, 0, 0.08);
            --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.12);
            --shadow-xl: 0 30px 80px rgba(0, 0, 0, 0.15);
            --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --sidebar-width: 240px;
            --header-height: 64px;
            --font-sans: 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
        }

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

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

        body {
            font-family: var(--font-sans);
            font-size: 16px;
            line-height: 1.7;
            color: var(--text-body);
            background: var(--bg-white);
            overflow-x: hidden;
        }

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

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

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

        button {
            cursor: pointer;
            background: none;
        }

        ul,
        ol {
            list-style: none;
            padding: 0;
            margin: 0;
        }

        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            color: var(--text-dark);
            font-weight: 700;
            line-height: 1.3;
            margin: 0 0 0.5em;
        }

        p {
            margin: 0 0 1em;
        }

        /* ===== 布局容器 ===== */
        .layout-wrapper {
            display: flex;
            min-height: 100vh;
        }

        .main-content {
            flex: 1;
            margin-left: var(--sidebar-width);
            min-height: 100vh;
            background: var(--bg-white);
        }

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

        .container-narrow {
            max-width: 960px;
            margin: 0 auto;
            padding: 0 24px;
        }

        .section {
            padding: 80px 0;
        }

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

        .section-dark {
            background: var(--bg-dark);
            color: #e0e8f0;
        }
        .section-dark h2,
        .section-dark h3,
        .section-dark h4 {
            color: #ffffff;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 800;
            text-align: center;
            margin-bottom: 12px;
            letter-spacing: -0.5px;
        }

        .section-sub {
            text-align: center;
            font-size: 1.1rem;
            color: var(--text-muted);
            max-width: 640px;
            margin: 0 auto 48px;
            line-height: 1.6;
        }

        .section-sub-left {
            text-align: left;
            margin-left: 0;
        }

        /* ===== 侧边导航 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            width: var(--sidebar-width);
            height: 100vh;
            background: var(--bg-dark);
            color: #c8d6e5;
            display: flex;
            flex-direction: column;
            z-index: 1000;
            box-shadow: 2px 0 20px rgba(0, 0, 0, 0.2);
            transition: transform var(--transition);
        }

        .sidebar-brand {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 28px 20px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .sidebar-brand .brand-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--accent), var(--primary-light));
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.3rem;
            font-weight: 700;
            color: #fff;
            flex-shrink: 0;
        }

        .sidebar-brand .brand-text {
            font-size: 1.15rem;
            font-weight: 700;
            color: #ffffff;
            letter-spacing: 0.5px;
        }

        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            display: flex;
            flex-direction: column;
            gap: 4px;
            overflow-y: auto;
        }

        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 12px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: #a0b4c8;
            font-size: 0.95rem;
            font-weight: 500;
            transition: var(--transition);
            text-decoration: none;
        }

        .sidebar-nav a i {
            width: 20px;
            text-align: center;
            font-size: 1.05rem;
            flex-shrink: 0;
        }

        .sidebar-nav a:hover {
            background: rgba(255, 255, 255, 0.06);
            color: #ffffff;
        }

        .sidebar-nav a.active {
            background: rgba(0, 188, 212, 0.15);
            color: var(--accent-light);
            font-weight: 600;
            border-left: 3px solid var(--accent);
        }

        .sidebar-nav a.active i {
            color: var(--accent-light);
        }

        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.75rem;
            color: #5a6a7e;
            text-align: center;
            line-height: 1.5;
        }

        /* ===== 移动端导航触发器 ===== */
        .nav-trigger {
            display: none;
            position: fixed;
            top: 12px;
            left: 12px;
            z-index: 1100;
            width: 44px;
            height: 44px;
            background: var(--primary);
            border-radius: var(--radius-sm);
            color: #fff;
            font-size: 1.3rem;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow-md);
            border: none;
            cursor: pointer;
            transition: var(--transition);
        }
        .nav-trigger:hover {
            background: var(--primary-dark);
            transform: scale(1.05);
        }

        .nav-overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.5);
            z-index: 999;
            backdrop-filter: blur(4px);
        }

        /* ===== Hero 区 ===== */
        .hero-category {
            position: relative;
            padding: 100px 0 80px;
            background: linear-gradient(135deg, var(--bg-dark) 0%, #122a44 100%);
            overflow: hidden;
            min-height: 420px;
            display: flex;
            align-items: center;
        }

        .hero-category::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-1.png');
            background-size: cover;
            background-position: center;
            opacity: 0.15;
            z-index: 1;
        }

        .hero-category::after {
            content: '';
            position: absolute;
            inset: 0;
            background: radial-gradient(ellipse at 30% 50%, rgba(0, 188, 212, 0.08) 0%, transparent 70%);
            z-index: 1;
        }

        .hero-category .container {
            position: relative;
            z-index: 2;
        }

        .hero-category .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 188, 212, 0.15);
            color: var(--accent-light);
            padding: 6px 18px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 20px;
            border: 1px solid rgba(0, 188, 212, 0.2);
        }

        .hero-category .hero-badge i {
            font-size: 0.75rem;
        }

        .hero-category h1 {
            font-size: 3rem;
            font-weight: 800;
            color: #ffffff;
            margin-bottom: 16px;
            letter-spacing: -1px;
            line-height: 1.2;
        }

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

        .hero-category .hero-desc {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.75);
            max-width: 600px;
            line-height: 1.7;
            margin-bottom: 32px;
        }

        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
        }

        .hero-actions .btn-primary {
            padding: 14px 36px;
            background: linear-gradient(135deg, var(--accent), var(--primary-light));
            color: #fff;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            box-shadow: 0 8px 30px rgba(0, 188, 212, 0.3);
            transition: var(--transition);
            border: none;
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .hero-actions .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 40px rgba(0, 188, 212, 0.4);
        }

        .hero-actions .btn-outline {
            padding: 14px 36px;
            background: transparent;
            color: #fff;
            border-radius: 50px;
            font-weight: 600;
            font-size: 1rem;
            border: 2px solid rgba(255, 255, 255, 0.25);
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .hero-actions .btn-outline:hover {
            border-color: var(--accent);
            background: rgba(0, 188, 212, 0.1);
        }

        /* ===== 统计卡片 ===== */
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
            margin-top: -40px;
            position: relative;
            z-index: 3;
        }

        .stat-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            padding: 32px 24px;
            text-align: center;
            box-shadow: var(--shadow-lg);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-xl);
        }

        .stat-card .stat-number {
            font-size: 2.6rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            line-height: 1.2;
        }

        .stat-card .stat-label {
            color: var(--text-muted);
            font-size: 0.95rem;
            margin-top: 8px;
            font-weight: 500;
        }

        .stat-card .stat-icon {
            font-size: 2rem;
            color: var(--accent);
            margin-bottom: 12px;
            opacity: 0.6;
        }

        /* ===== 设备卡片 ===== */
        .device-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .device-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
            display: flex;
            flex-direction: column;
        }
        .device-card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lg);
        }

        .device-card .card-img {
            height: 200px;
            background: var(--bg-light);
            overflow: hidden;
            position: relative;
        }
        .device-card .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .device-card:hover .card-img img {
            transform: scale(1.05);
        }

        .device-card .card-img .card-tag {
            position: absolute;
            top: 12px;
            left: 12px;
            background: var(--accent);
            color: #fff;
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
        }

        .device-card .card-body {
            padding: 20px 20px 24px;
            flex: 1;
            display: flex;
            flex-direction: column;
        }

        .device-card .card-body h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .device-card .card-body p {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
            flex: 1;
            margin-bottom: 16px;
        }

        .device-card .card-body .card-meta {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
        }

        .device-card .card-body .card-meta .rating {
            color: #f59e0b;
            font-size: 0.85rem;
            display: flex;
            align-items: center;
            gap: 4px;
        }

        .device-card .card-body .card-meta .price {
            font-weight: 700;
            color: var(--primary);
            font-size: 1.05rem;
        }

        /* ===== 技术特点 ===== */
        .tech-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 32px;
        }

        .tech-card {
            text-align: center;
            padding: 40px 24px;
            background: var(--bg-white);
            border-radius: var(--radius);
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .tech-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
            border-color: var(--accent);
        }

        .tech-card .tech-icon {
            width: 64px;
            height: 64px;
            margin: 0 auto 20px;
            background: linear-gradient(135deg, rgba(0, 188, 212, 0.1), rgba(13, 71, 161, 0.1));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.8rem;
            color: var(--accent);
        }

        .tech-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .tech-card p {
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.7;
        }

        /* ===== 案例卡片 ===== */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .case-card {
            background: var(--bg-white);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            border: 1px solid var(--border);
            transition: var(--transition);
        }
        .case-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-md);
        }

        .case-card .case-img {
            height: 180px;
            overflow: hidden;
        }
        .case-card .case-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.5s ease;
        }
        .case-card:hover .case-img img {
            transform: scale(1.05);
        }

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

        .case-card .case-body .case-tag {
            display: inline-block;
            background: rgba(0, 188, 212, 0.1);
            color: var(--accent-dark);
            padding: 2px 12px;
            border-radius: 50px;
            font-size: 0.75rem;
            font-weight: 600;
            margin-bottom: 10px;
        }

        .case-card .case-body h3 {
            font-size: 1.05rem;
            font-weight: 700;
            margin-bottom: 8px;
        }

        .case-card .case-body p {
            color: var(--text-muted);
            font-size: 0.88rem;
            line-height: 1.7;
            margin-bottom: 12px;
        }

        .case-card .case-body .case-user {
            display: flex;
            align-items: center;
            gap: 10px;
            padding-top: 12px;
            border-top: 1px solid var(--border-light);
        }

        .case-card .case-body .case-user .avatar {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-light), var(--accent));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 700;
            font-size: 0.85rem;
            flex-shrink: 0;
        }

        .case-card .case-body .case-user .user-info {
            font-size: 0.82rem;
        }
        .case-card .case-body .case-user .user-info .name {
            font-weight: 600;
            color: var(--text-dark);
        }
        .case-card .case-body .case-user .user-info .role {
            color: var(--text-muted);
        }

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

        .faq-item {
            background: var(--bg-white);
            border-radius: var(--radius-sm);
            border: 1px solid var(--border);
            overflow: hidden;
            transition: var(--transition);
        }
        .faq-item:hover {
            border-color: var(--accent);
            box-shadow: var(--shadow-sm);
        }

        .faq-item .faq-question {
            padding: 18px 24px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            font-weight: 600;
            color: var(--text-dark);
            font-size: 1rem;
            transition: var(--transition);
            user-select: none;
        }
        .faq-item .faq-question:hover {
            color: var(--primary);
        }
        .faq-item .faq-question i {
            color: var(--accent);
            transition: transform 0.3s ease;
            font-size: 0.85rem;
        }
        .faq-item.active .faq-question i {
            transform: rotate(180deg);
        }

        .faq-item .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.4s ease;
            padding: 0 24px;
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 300px;
            padding: 0 24px 20px;
        }

        /* ===== CTA 区块 ===== */
        .cta-section {
            padding: 80px 0;
            background: linear-gradient(135deg, var(--bg-dark) 0%, #122a44 100%);
            position: relative;
            overflow: hidden;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            opacity: 0.08;
            z-index: 1;
        }
        .cta-section .container {
            position: relative;
            z-index: 2;
        }

        .cta-box {
            text-align: center;
            padding: 40px 20px;
        }
        .cta-box h2 {
            color: #ffffff;
            font-size: 2rem;
            font-weight: 800;
            margin-bottom: 16px;
        }
        .cta-box p {
            color: rgba(255, 255, 255, 0.7);
            font-size: 1.1rem;
            max-width: 560px;
            margin: 0 auto 32px;
        }
        .cta-box .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 10px;
            padding: 16px 48px;
            background: linear-gradient(135deg, var(--accent), var(--primary-light));
            color: #fff;
            border-radius: 50px;
            font-weight: 700;
            font-size: 1.05rem;
            box-shadow: 0 8px 30px rgba(0, 188, 212, 0.3);
            transition: var(--transition);
            border: none;
        }
        .cta-box .btn-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 40px rgba(0, 188, 212, 0.45);
        }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--bg-dark);
            color: #a0b4c8;
            padding: 60px 0 0;
            font-size: 0.9rem;
        }

        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 40px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }

        .site-footer .footer-brand .brand-text {
            font-size: 1.3rem;
            font-weight: 700;
            color: #ffffff;
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 16px;
        }
        .site-footer .footer-brand .brand-text .icon {
            width: 32px;
            height: 32px;
            background: linear-gradient(135deg, var(--accent), var(--primary-light));
            border-radius: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: 700;
            font-size: 0.85rem;
        }
        .site-footer .footer-brand p {
            color: #7a8a9e;
            line-height: 1.8;
            max-width: 360px;
        }

        .site-footer .footer-col h4 {
            color: #ffffff;
            font-size: 1rem;
            font-weight: 700;
            margin-bottom: 18px;
        }

        .site-footer .footer-col ul li {
            margin-bottom: 10px;
        }
        .site-footer .footer-col ul li a {
            color: #7a8a9e;
            transition: var(--transition);
            font-size: 0.88rem;
        }
        .site-footer .footer-col ul li a:hover {
            color: var(--accent-light);
            padding-left: 4px;
        }

        .site-footer .footer-bottom {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 0;
            font-size: 0.8rem;
            color: #5a6a7e;
            flex-wrap: wrap;
            gap: 12px;
        }
        .site-footer .footer-bottom .links {
            display: flex;
            gap: 20px;
        }
        .site-footer .footer-bottom .links a {
            color: #5a6a7e;
            transition: var(--transition);
        }
        .site-footer .footer-bottom .links a:hover {
            color: var(--accent-light);
        }

        /* ===== 按钮通用 ===== */
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: var(--transition);
            border: none;
            cursor: pointer;
            text-decoration: none;
        }
        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--primary-light));
            color: #fff;
            box-shadow: 0 4px 16px rgba(13, 71, 161, 0.25);
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(13, 71, 161, 0.35);
            color: #fff;
        }
        .btn-accent {
            background: linear-gradient(135deg, var(--accent), var(--accent-dark));
            color: #fff;
            box-shadow: 0 4px 16px rgba(0, 188, 212, 0.25);
        }
        .btn-accent:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 28px rgba(0, 188, 212, 0.35);
            color: #fff;
        }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            padding: 16px 0;
            font-size: 0.85rem;
            color: var(--text-muted);
            flex-wrap: wrap;
        }
        .breadcrumb a {
            color: var(--text-muted);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: var(--border);
        }
        .breadcrumb .current {
            color: var(--primary);
            font-weight: 600;
        }

        /* ===== 分隔线 ===== */
        .divider {
            width: 60px;
            height: 3px;
            background: linear-gradient(135deg, var(--accent), var(--primary-light));
            border-radius: 4px;
            margin: 0 auto 16px;
        }
        .divider-left {
            margin: 0 0 16px;
        }

        /* ===== 徽章 ===== */
        .badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: rgba(0, 188, 212, 0.1);
            color: var(--accent-dark);
            padding: 4px 14px;
            border-radius: 50px;
            font-size: 0.78rem;
            font-weight: 600;
        }
        .badge-primary {
            background: rgba(13, 71, 161, 0.1);
            color: var(--primary);
        }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .device-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .case-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .tech-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .site-footer .footer-grid {
                grid-template-columns: 1fr 1fr;
                gap: 32px;
            }
            .hero-category h1 {
                font-size: 2.4rem;
            }
        }

        @media (max-width: 768px) {
            :root {
                --sidebar-width: 0px;
            }

            .nav-trigger {
                display: flex;
            }

            .sidebar {
                transform: translateX(-100%);
                width: 280px;
            }
            .sidebar.open {
                transform: translateX(0);
            }

            .nav-overlay.open {
                display: block;
            }

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

            .hero-category {
                padding: 80px 0 60px;
                min-height: auto;
            }
            .hero-category h1 {
                font-size: 2rem;
            }
            .hero-category .hero-desc {
                font-size: 1rem;
            }

            .stats-grid {
                grid-template-columns: 1fr;
                gap: 16px;
                margin-top: 0;
                padding-top: 40px;
            }

            .device-grid {
                grid-template-columns: 1fr;
            }
            .case-grid {
                grid-template-columns: 1fr;
            }
            .tech-grid {
                grid-template-columns: 1fr;
            }

            .section {
                padding: 48px 0;
            }
            .section-title {
                font-size: 1.6rem;
            }
            .section-sub {
                font-size: 0.95rem;
                margin-bottom: 32px;
            }

            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .site-footer .footer-bottom {
                flex-direction: column;
                text-align: center;
            }
            .site-footer .footer-bottom .links {
                justify-content: center;
            }

            .hero-actions {
                flex-direction: column;
                align-items: stretch;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-outline {
                justify-content: center;
                text-align: center;
            }

            .stat-card {
                padding: 24px 20px;
            }
            .stat-card .stat-number {
                font-size: 2rem;
            }

            .cta-box h2 {
                font-size: 1.5rem;
            }
            .cta-box p {
                font-size: 0.95rem;
            }

            .faq-item .faq-question {
                padding: 14px 18px;
                font-size: 0.92rem;
            }
            .faq-item .faq-answer {
                padding: 0 18px;
                font-size: 0.88rem;
            }
            .faq-item.active .faq-answer {
                padding: 0 18px 16px;
            }

            .container {
                padding: 0 16px;
            }

            .breadcrumb {
                font-size: 0.78rem;
                padding: 12px 0;
            }

            .device-card .card-img {
                height: 160px;
            }
            .case-card .case-img {
                height: 150px;
            }
        }

        @media (max-width: 520px) {
            .hero-category h1 {
                font-size: 1.6rem;
            }
            .hero-category .hero-desc {
                font-size: 0.9rem;
            }
            .hero-actions .btn-primary,
            .hero-actions .btn-outline {
                padding: 12px 24px;
                font-size: 0.88rem;
            }
            .section-title {
                font-size: 1.3rem;
            }
            .cta-box .btn-cta {
                padding: 14px 32px;
                font-size: 0.92rem;
            }
            .tech-card {
                padding: 28px 16px;
            }
            .tech-card .tech-icon {
                width: 48px;
                height: 48px;
                font-size: 1.4rem;
            }
            .stat-card {
                padding: 20px 16px;
            }
        }

        /* ===== 辅助类 ===== */
        .text-center {
            text-align: center;
        }
        .text-accent {
            color: var(--accent);
        }
        .mt-1 {
            margin-top: 8px;
        }
        .mt-2 {
            margin-top: 16px;
        }
        .mt-3 {
            margin-top: 24px;
        }
        .mb-1 {
            margin-bottom: 8px;
        }
        .mb-2 {
            margin-bottom: 16px;
        }
        .mb-3 {
            margin-bottom: 24px;
        }

        /* Foundation 覆盖 */
        .grid-container {
            max-width: 1200px;
            padding-left: 24px;
            padding-right: 24px;
        }
        @media (max-width: 768px) {
            .grid-container {
                padding-left: 16px;
                padding-right: 16px;
            }
        }

/* roulang page: article */
:root {
            --primary: #1a2a4a;
            --primary-light: #2c4a7a;
            --primary-dark: #0f1a30;
            --accent: #d4a84b;
            --accent-light: #e8c56a;
            --accent-dark: #b88930;
            --bg: #f8f6f2;
            --bg-card: #ffffff;
            --bg-dark: #1a2a4a;
            --bg-soft: #f0ede7;
            --text: #1e1e1e;
            --text-light: #5a5a5a;
            --text-muted: #8a8a8a;
            --text-white: #f5f3ef;
            --border: #e0dbd3;
            --border-light: #f0ede7;
            --radius: 12px;
            --radius-sm: 8px;
            --radius-lg: 18px;
            --shadow: 0 4px 20px rgba(26, 42, 74, 0.08);
            --shadow-hover: 0 12px 40px rgba(26, 42, 74, 0.14);
            --shadow-sidebar: 2px 0 30px rgba(26, 42, 74, 0.10);
            --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
            --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif;
            --sidebar-width: 240px;
            --sidebar-collapsed: 68px;
            --header-height: 64px;
            --max-width: 1200px;
        }
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            display: flex;
            min-height: 100vh;
        }
        a { color: var(--primary-light); text-decoration: none; transition: color var(--transition); }
        a:hover { color: var(--accent); }
        a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
        img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-sm); }
        ul, ol { list-style: none; padding: 0; margin: 0; }
        .container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; width: 100%; }
        .text-accent { color: var(--accent); }
        .text-muted { color: var(--text-muted); }
        .text-light { color: var(--text-light); }
        .text-white { color: var(--text-white); }
        .bg-primary { background: var(--primary); }
        .bg-accent { background: var(--accent); }
        .bg-soft { background: var(--bg-soft); }
        .mb-1 { margin-bottom: 8px; }
        .mb-2 { margin-bottom: 16px; }
        .mb-3 { margin-bottom: 24px; }
        .mb-4 { margin-bottom: 32px; }
        .mb-5 { margin-bottom: 48px; }
        .mt-2 { margin-top: 16px; }
        .mt-3 { margin-top: 24px; }
        .mt-4 { margin-top: 32px; }
        .mt-5 { margin-top: 48px; }
        .py-3 { padding-top: 24px; padding-bottom: 24px; }
        .py-4 { padding-top: 32px; padding-bottom: 32px; }
        .py-5 { padding-top: 48px; padding-bottom: 48px; }
        .px-2 { padding-left: 16px; padding-right: 16px; }
        .flex-center { display: flex; align-items: center; justify-content: center; }
        .flex-between { display: flex; align-items: center; justify-content: space-between; }
        .gap-1 { gap: 8px; }
        .gap-2 { gap: 16px; }
        .gap-3 { gap: 24px; }
        .gap-4 { gap: 32px; }
        .text-center { text-align: center; }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
            padding: 12px 28px;
            border-radius: var(--radius-sm);
            font-weight: 600;
            font-size: 15px;
            line-height: 1.4;
            border: none;
            cursor: pointer;
            transition: all var(--transition);
            text-decoration: none;
            background: var(--primary);
            color: var(--text-white);
            box-shadow: 0 2px 8px rgba(26, 42, 74, 0.12);
        }
        .btn:hover { background: var(--primary-light); color: var(--text-white); transform: translateY(-2px); box-shadow: var(--shadow-hover); }
        .btn:active { transform: translateY(0); box-shadow: 0 2px 6px rgba(26, 42, 74, 0.10); }
        .btn-accent { background: var(--accent); color: var(--primary-dark); }
        .btn-accent:hover { background: var(--accent-light); color: var(--primary-dark); }
        .btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); box-shadow: none; }
        .btn-outline:hover { background: var(--primary); color: var(--text-white); border-color: var(--primary); }
        .btn-sm { padding: 8px 18px; font-size: 13px; }
        .btn-lg { padding: 16px 36px; font-size: 17px; border-radius: var(--radius); }
        .badge {
            display: inline-block;
            padding: 4px 14px;
            border-radius: 20px;
            font-size: 12px;
            font-weight: 600;
            letter-spacing: 0.3px;
            background: var(--bg-soft);
            color: var(--text-light);
            border: 1px solid var(--border);
        }
        .badge-accent { background: rgba(212, 168, 75, 0.15); color: var(--accent-dark); border-color: rgba(212, 168, 75, 0.3); }
        .badge-primary { background: rgba(26, 42, 74, 0.10); color: var(--primary); border-color: rgba(26, 42, 74, 0.15); }
        .section-title {
            font-size: 28px;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 12px;
            letter-spacing: -0.3px;
            line-height: 1.3;
        }
        .section-subtitle {
            font-size: 16px;
            color: var(--text-muted);
            max-width: 600px;
            line-height: 1.6;
        }
        .divider {
            height: 1px;
            background: var(--border);
            margin: 48px 0;
            width: 100%;
        }

        /* ===== 侧边栏 ===== */
        .sidebar {
            position: fixed;
            top: 0;
            left: 0;
            bottom: 0;
            width: var(--sidebar-width);
            background: var(--primary);
            color: var(--text-white);
            display: flex;
            flex-direction: column;
            z-index: 1000;
            transition: transform var(--transition);
            box-shadow: var(--shadow-sidebar);
            overflow-y: auto;
        }
        .sidebar-brand {
            padding: 28px 20px 20px;
            display: flex;
            align-items: center;
            gap: 12px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .sidebar-brand .brand-icon {
            width: 40px;
            height: 40px;
            background: var(--accent);
            color: var(--primary-dark);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 18px;
            flex-shrink: 0;
        }
        .sidebar-brand .brand-text {
            font-weight: 700;
            font-size: 17px;
            letter-spacing: 0.5px;
            color: var(--text-white);
            line-height: 1.3;
        }
        .sidebar-nav {
            flex: 1;
            padding: 16px 12px;
            display: flex;
            flex-direction: column;
            gap: 2px;
        }
        .sidebar-nav a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 12px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.72);
            font-weight: 500;
            font-size: 15px;
            transition: all var(--transition);
            text-decoration: none;
        }
        .sidebar-nav a i { width: 20px; text-align: center; font-size: 16px; }
        .sidebar-nav a:hover { background: rgba(255,255,255,0.10); color: var(--text-white); }
        .sidebar-nav a.active { background: rgba(212, 168, 75, 0.18); color: var(--accent); font-weight: 600; }
        .sidebar-footer {
            padding: 16px 20px;
            border-top: 1px solid rgba(255,255,255,0.08);
            font-size: 12px;
            color: rgba(255,255,255,0.4);
            text-align: center;
        }
        .sidebar-footer a { color: rgba(255,255,255,0.5); }
        .sidebar-footer a:hover { color: var(--accent); }

        /* ===== 主内容 ===== */
        .main-content {
            margin-left: var(--sidebar-width);
            flex: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        .main-content > .container {
            flex: 1;
            padding-top: 40px;
            padding-bottom: 40px;
        }

        /* ===== 移动端顶部栏 ===== */
        .mobile-header {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            height: var(--header-height);
            background: var(--primary);
            z-index: 1100;
            align-items: center;
            padding: 0 16px;
            box-shadow: 0 2px 12px rgba(26, 42, 74, 0.15);
        }
        .mobile-header .brand-icon {
            width: 36px;
            height: 36px;
            background: var(--accent);
            color: var(--primary-dark);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 16px;
            flex-shrink: 0;
        }
        .mobile-header .brand-text {
            font-weight: 700;
            font-size: 15px;
            color: var(--text-white);
            margin-left: 10px;
        }
        .mobile-header .hamburger {
            background: none;
            border: none;
            color: var(--text-white);
            font-size: 24px;
            cursor: pointer;
            padding: 8px;
            border-radius: 6px;
            transition: background var(--transition);
        }
        .mobile-header .hamburger:hover { background: rgba(255,255,255,0.10); }
        .mobile-nav-overlay {
            display: none;
            position: fixed;
            top: var(--header-height);
            left: 0;
            right: 0;
            bottom: 0;
            background: var(--primary);
            z-index: 1050;
            padding: 20px 16px;
            overflow-y: auto;
            flex-direction: column;
            gap: 2px;
        }
        .mobile-nav-overlay.open { display: flex; }
        .mobile-nav-overlay a {
            display: flex;
            align-items: center;
            gap: 14px;
            padding: 14px 16px;
            border-radius: var(--radius-sm);
            color: rgba(255,255,255,0.72);
            font-weight: 500;
            font-size: 16px;
            transition: all var(--transition);
            text-decoration: none;
        }
        .mobile-nav-overlay a i { width: 20px; text-align: center; }
        .mobile-nav-overlay a:hover { background: rgba(255,255,255,0.10); color: var(--text-white); }
        .mobile-nav-overlay a.active { background: rgba(212, 168, 75, 0.18); color: var(--accent); }

        /* ===== 面包屑 ===== */
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-muted);
            margin-bottom: 24px;
            flex-wrap: wrap;
        }
        .breadcrumb a { color: var(--text-muted); }
        .breadcrumb a:hover { color: var(--primary); }
        .breadcrumb .sep { color: var(--border); font-size: 12px; }
        .breadcrumb .current { color: var(--text); font-weight: 500; }

        /* ===== 文章详情 ===== */
        .article-header {
            margin-bottom: 32px;
            padding-bottom: 24px;
            border-bottom: 1px solid var(--border);
        }
        .article-header h1 {
            font-size: 34px;
            font-weight: 800;
            color: var(--primary);
            line-height: 1.3;
            margin-bottom: 16px;
            letter-spacing: -0.5px;
        }
        .article-meta {
            display: flex;
            align-items: center;
            gap: 20px;
            flex-wrap: wrap;
            font-size: 14px;
            color: var(--text-muted);
        }
        .article-meta .meta-item { display: flex; align-items: center; gap: 6px; }
        .article-meta .meta-item i { font-size: 14px; color: var(--accent); }
        .article-meta .badge { font-size: 12px; padding: 3px 12px; }
        .article-featured-image {
            margin-bottom: 32px;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
        }
        .article-featured-image img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
        .article-body {
            font-size: 17px;
            line-height: 1.85;
            color: var(--text);
        }
        .article-body p { margin-bottom: 1.4em; }
        .article-body h2, .article-body h3 { margin-top: 1.8em; margin-bottom: 0.8em; color: var(--primary); font-weight: 700; }
        .article-body h2 { font-size: 24px; }
        .article-body h3 { font-size: 20px; }
        .article-body ul, .article-body ol { margin-bottom: 1.4em; padding-left: 1.6em; list-style: disc; }
        .article-body ol { list-style: decimal; }
        .article-body li { margin-bottom: 0.4em; }
        .article-body blockquote {
            border-left: 4px solid var(--accent);
            background: var(--bg-soft);
            padding: 16px 24px;
            margin: 1.6em 0;
            border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
            color: var(--text-light);
            font-style: italic;
        }
        .article-body img { margin: 1.6em 0; border-radius: var(--radius-sm); box-shadow: var(--shadow); }
        .article-body a { color: var(--primary-light); text-decoration: underline; text-underline-offset: 2px; }
        .article-body a:hover { color: var(--accent); }
        .article-footer-meta {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            padding-top: 24px;
            margin-top: 32px;
            border-top: 1px solid var(--border);
        }
        .article-tags { display: flex; gap: 8px; flex-wrap: wrap; }
        .article-tags .badge { font-size: 13px; padding: 5px 16px; cursor: default; }
        .article-share { display: flex; gap: 10px; align-items: center; }
        .article-share span { font-size: 14px; color: var(--text-muted); }
        .article-share a {
            width: 36px; height: 36px;
            border-radius: 50%;
            background: var(--bg-soft);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-light);
            transition: all var(--transition);
            font-size: 16px;
        }
        .article-share a:hover { background: var(--primary); color: var(--text-white); transform: translateY(-2px); }

        /* ===== 上下篇 ===== */
        .article-pagination {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin-top: 40px;
        }
        .article-pagination a {
            padding: 20px 24px;
            border-radius: var(--radius);
            background: var(--bg-card);
            border: 1px solid var(--border);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            gap: 6px;
            text-decoration: none;
            box-shadow: var(--shadow);
        }
        .article-pagination a:hover { border-color: var(--accent); box-shadow: var(--shadow-hover); transform: translateY(-2px); }
        .article-pagination .pagination-label { font-size: 12px; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }
        .article-pagination .pagination-title { font-weight: 600; color: var(--primary); font-size: 15px; line-height: 1.4; }
        .article-pagination .next { text-align: right; }

        /* ===== 相关推荐 ===== */
        .related-section { margin-top: 60px; }
        .related-section .section-title { font-size: 24px; margin-bottom: 24px; }
        .related-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }
        .related-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            text-decoration: none;
            color: var(--text);
        }
        .related-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-hover); border-color: var(--accent); }
        .related-card .card-img { width: 100%; aspect-ratio: 16/9; object-fit: cover; }
        .related-card .card-body { padding: 18px 20px 20px; flex: 1; display: flex; flex-direction: column; }
        .related-card .card-body .badge { align-self: flex-start; margin-bottom: 10px; }
        .related-card .card-body h3 { font-size: 16px; font-weight: 700; color: var(--primary); line-height: 1.4; margin-bottom: 8px; transition: color var(--transition); }
        .related-card:hover .card-body h3 { color: var(--accent-dark); }
        .related-card .card-body p { font-size: 14px; color: var(--text-light); line-height: 1.6; flex: 1; }
        .related-card .card-body .card-meta { font-size: 12px; color: var(--text-muted); margin-top: 12px; display: flex; align-items: center; gap: 12px; }

        /* ===== CTA ===== */
        .cta-section {
            margin-top: 60px;
            padding: 48px 40px;
            border-radius: var(--radius-lg);
            background: var(--primary);
            color: var(--text-white);
            text-align: center;
            background-image: url('/assets/images/backpic/back-2.png');
            background-size: cover;
            background-position: center;
            position: relative;
            isolation: isolate;
        }
        .cta-section::before {
            content: '';
            position: absolute;
            inset: 0;
            background: rgba(26, 42, 74, 0.82);
            border-radius: var(--radius-lg);
            z-index: 0;
        }
        .cta-section > * { position: relative; z-index: 1; }
        .cta-section h2 { font-size: 30px; font-weight: 700; margin-bottom: 12px; }
        .cta-section p { font-size: 16px; opacity: 0.85; max-width: 560px; margin: 0 auto 28px; line-height: 1.6; }
        .cta-section .btn { background: var(--accent); color: var(--primary-dark); }
        .cta-section .btn:hover { background: var(--accent-light); }

        /* ===== 页脚 ===== */
        .site-footer {
            background: var(--primary-dark);
            color: rgba(255,255,255,0.7);
            padding: 48px 0 24px;
            margin-top: 0;
            flex-shrink: 0;
        }
        .site-footer .container { padding-left: 24px; padding-right: 24px; }
        .footer-grid {
            display: grid;
            grid-template-columns: 1.8fr 1fr 1fr 1fr;
            gap: 40px;
            padding-bottom: 32px;
            border-bottom: 1px solid rgba(255,255,255,0.08);
        }
        .footer-brand .brand-text { font-size: 20px; font-weight: 700; color: var(--text-white); display: flex; align-items: center; gap: 10px; margin-bottom: 14px; }
        .footer-brand .brand-text .icon { width: 36px; height: 36px; background: var(--accent); color: var(--primary-dark); border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 16px; font-weight: 800; }
        .footer-brand p { font-size: 14px; line-height: 1.7; opacity: 0.75; max-width: 360px; }
        .footer-col h4 { font-size: 15px; font-weight: 600; color: var(--text-white); margin-bottom: 16px; }
        .footer-col ul li { margin-bottom: 10px; }
        .footer-col ul li a { font-size: 14px; color: rgba(255,255,255,0.6); transition: all var(--transition); }
        .footer-col ul li a:hover { color: var(--accent); padding-left: 4px; }
        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            padding-top: 20px;
            font-size: 13px;
            opacity: 0.6;
        }
        .footer-bottom .links { display: flex; gap: 20px; }
        .footer-bottom .links a { color: rgba(255,255,255,0.6); font-size: 13px; }
        .footer-bottom .links a:hover { color: var(--accent); }

        /* ===== 文章不存在 ===== */
        .not-found-box {
            text-align: center;
            padding: 80px 20px;
            background: var(--bg-card);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }
        .not-found-box i { font-size: 56px; color: var(--text-muted); margin-bottom: 20px; }
        .not-found-box h2 { font-size: 28px; color: var(--primary); margin-bottom: 12px; }
        .not-found-box p { color: var(--text-light); margin-bottom: 24px; font-size: 16px; }

        /* ===== 响应式 ===== */
        @media (max-width: 1024px) {
            .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
            .related-grid { grid-template-columns: 1fr 1fr; }
            .article-header h1 { font-size: 28px; }
        }
        @media (max-width: 768px) {
            .sidebar { display: none; }
            .mobile-header { display: flex; }
            .main-content { margin-left: 0; padding-top: var(--header-height); }
            .main-content > .container { padding-top: 24px; padding-bottom: 24px; }
            .article-header h1 { font-size: 24px; }
            .article-body { font-size: 16px; }
            .footer-grid { grid-template-columns: 1fr; gap: 24px; }
            .footer-bottom { flex-direction: column; text-align: center; }
            .cta-section { padding: 32px 24px; }
            .cta-section h2 { font-size: 24px; }
            .related-grid { grid-template-columns: 1fr; }
            .article-pagination { grid-template-columns: 1fr; }
            .article-pagination .next { text-align: left; }
            .section-title { font-size: 24px; }
            .article-footer-meta { flex-direction: column; align-items: flex-start; }
        }
        @media (max-width: 520px) {
            .container { padding: 0 16px; }
            .article-header h1 { font-size: 20px; }
            .article-meta { gap: 12px; font-size: 13px; }
            .article-body { font-size: 15px; }
            .cta-section { padding: 24px 16px; }
            .cta-section h2 { font-size: 20px; }
            .btn-lg { padding: 12px 24px; font-size: 15px; }
            .related-card .card-body { padding: 14px 16px; }
            .footer-grid { gap: 20px; }
            .site-footer { padding: 32px 0 16px; }
        }

        /* Foundation 覆盖 */
        .grid-container { max-width: var(--max-width); padding-left: 0; padding-right: 0; }
        .cell { margin-bottom: 0; }
        .grid-x > .cell { padding: 0; }
        .grid-margin-x > .cell { margin-left: 0; margin-right: 0; }
        .grid-padding-x > .cell { padding-left: 0; padding-right: 0; }