:root {
            --bg-main: #f8fafc;
            --bg-card: #ffffff;
            --primary: #6366f1;
            --primary-dark: #4f46e5;
            --accent: #06b6d4;
            --text-heading: #0f172a;
            --text-body: #475569;
            --text-muted: #94a3b8;
            --border: #e2e8f0;
            --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
            --shadow-md: 0 10px 25px rgba(0,0,0,0.06);
            --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.05), 0 8px 10px -6px rgba(0,0,0,0.01);
            --radius-sm: 10px;
            --radius-md: 16px;
            --transition: 0.25s ease;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans SC", sans-serif;
            background-color: var(--bg-main);
            color: var(--text-body);
            line-height: 1.6;
            overflow-x: hidden;
        }

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

        /* 导航栏 */
        .header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(16px);
            border-bottom: 1px solid var(--border);
        }

        .nav-container {
            max-width: 1280px;
            margin: 0 auto;
            padding: 1rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.4rem;
            font-weight: 800;
            color: var(--text-heading);
        }

        .logo-svg {
            width: 32px;
            height: 32px;
            flex-shrink: 0;
        }

        .logo-badge {
            background: linear-gradient(135deg, var(--primary), var(--accent));
            color: white;
            font-size: 0.75rem;
            padding: 2px 8px;
            border-radius: 20px;
            font-weight: 600;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 2.2rem;
        }

        .nav-link {
            font-size: 0.93rem;
            font-weight: 600;
            color: var(--text-body);
            position: relative;
            padding: 4px 0;
        }

        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--primary);
            border-radius: 2px;
            transition: width var(--transition);
        }

        .nav-link:hover,
        .nav-link.active {
            color: var(--primary);
        }
        .nav-link:hover::after,
        .nav-link.active::after {
            width: 100%;
        }

        .btn-nav {
            background-color: var(--text-heading);
            color: #ffffff !important;
            padding: 8px 18px;
            border-radius: 8px;
            font-size: 0.9rem;
            font-weight: 600;
            transition: all var(--transition);
        }

        .btn-nav:hover {
            background-color: var(--primary);
            box-shadow: 0 4px 12px rgba(99, 102, 241, 0.35);
            transform: translateY(-1px);
        }

        /* 页面头部 */
        .page-hero {
            padding: 150px 2rem 30px 2rem;
            text-align: center;
            max-width: 800px;
            margin: 0 auto;
        }

        .page-hero .hero-eyebrow {
            display: inline-block;
            background: #eef2ff;
            color: var(--primary);
            font-size: 0.85rem;
            font-weight: 700;
            padding: 5px 16px;
            border-radius: 30px;
            margin-bottom: 0.8rem;
            letter-spacing: 0.03em;
        }

        .page-hero h1 {
            font-size: 2.8rem;
            font-weight: 900;
            color: var(--text-heading);
            margin-bottom: 1rem;
            letter-spacing: -0.02em;
        }

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

        .page-hero p {
            font-size: 1.1rem;
            color: var(--text-body);
        }

        /* 新增创意版块：快速导航卡片 */
        .quick-nav-section {
            max-width: 900px;
            margin: 0 auto 30px;
            padding: 0 2rem;
        }

        .quick-nav-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 1.2rem;
        }

        .quick-nav-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 1.5rem 1rem;
            text-align: center;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
        }

        .quick-nav-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: var(--primary);
        }

        .quick-nav-card .nav-icon {
            font-size: 2rem;
            margin-bottom: 0.6rem;
        }

        .quick-nav-card h3 {
            font-size: 1.1rem;
            color: var(--text-heading);
            font-weight: 700;
            margin-bottom: 0.3rem;
        }

        .quick-nav-card p {
            font-size: 0.85rem;
            color: var(--text-muted);
            line-height: 1.4;
        }

        /* 搜索栏（创意版块） */
        .search-box {
            max-width: 600px;
            margin: 0 auto 40px;
            padding: 0 2rem;
        }

        .search-box form {
            display: flex;
            gap: 0;
            border-radius: 12px;
            overflow: hidden;
            border: 1.5px solid var(--border);
            box-shadow: var(--shadow-sm);
            background: #fff;
        }

        .search-box input {
            flex: 1;
            border: none;
            padding: 14px 20px;
            font-size: 1rem;
            outline: none;
            color: var(--text-heading);
            background: transparent;
        }

        .search-box button {
            background: linear-gradient(135deg, var(--primary), var(--primary-dark));
            border: none;
            color: white;
            padding: 0 24px;
            font-weight: 700;
            cursor: pointer;
            transition: opacity 0.2s;
        }

        .search-box button:hover {
            opacity: 0.9;
        }

        /* FAQ 容器 */
        .faq-container {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 2rem 80px 2rem;
        }

        .faq-tabs {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin-bottom: 2.5rem;
            flex-wrap: wrap;
        }

        .tab-btn {
            background: white;
            border: 1px solid var(--border);
            padding: 8px 20px;
            border-radius: 20px;
            font-weight: 600;
            font-size: 0.9rem;
            color: var(--text-body);
            cursor: pointer;
            transition: all 0.2s;
        }

        .tab-btn.active,
        .tab-btn:hover {
            background: var(--primary);
            color: white;
            border-color: var(--primary);
        }

        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .faq-item {
            background: white;
            border: 1px solid var(--border);
            border-radius: 12px;
            overflow: hidden;
            box-shadow: var(--shadow-sm);
            transition: border-color 0.2s;
        }

        .faq-item:hover {
            border-color: #cbd5e1;
        }

        .faq-question {
            padding: 1.2rem 1.5rem;
            font-size: 1.05rem;
            font-weight: 700;
            color: var(--text-heading);
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            user-select: none;
        }

        .faq-icon {
            width: 20px;
            height: 20px;
            transition: transform 0.3s;
            stroke: var(--primary);
            flex-shrink: 0;
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            background: #f8fafc;
            padding: 0 1.5rem;
            font-size: 0.95rem;
            color: var(--text-body);
            line-height: 1.6;
            border-top: 1px solid transparent;
        }

        .faq-item.open .faq-icon {
            transform: rotate(180deg);
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding: 1.2rem 1.5rem;
            border-top-color: var(--border);
        }

        /* 自助排查工具箱（创意版块） */
        .tools-section {
            max-width: 900px;
            margin: 60px auto 0;
            padding: 0 2rem;
        }

        .tools-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 1.5rem;
            margin-bottom: 3rem;
        }

        .tool-card {
            background: #fff;
            border: 1px solid var(--border);
            border-radius: var(--radius-md);
            padding: 1.8rem;
            text-align: left;
            transition: box-shadow var(--transition);
        }

        .tool-card:hover {
            box-shadow: var(--shadow-md);
        }

        .tool-card .tool-icon {
            font-size: 2rem;
            margin-bottom: 0.8rem;
        }

        .tool-card h4 {
            font-size: 1.2rem;
            color: var(--text-heading);
            font-weight: 700;
            margin-bottom: 0.4rem;
        }

        .tool-card p {
            font-size: 0.92rem;
            color: var(--text-body);
            line-height: 1.5;
        }

        /* 联系支持卡片 */
        .contact-box {
            background: white;
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 2.5rem;
            text-align: center;
            margin-top: 2rem;
            box-shadow: var(--shadow-sm);
        }

        .contact-box h3 {
            font-size: 1.4rem;
            color: var(--text-heading);
            margin-bottom: 0.8rem;
            font-weight: 800;
        }

        .contact-box p {
            font-size: 0.95rem;
            color: var(--text-body);
            margin-bottom: 1.5rem;
        }

        .btn-contact {
            display: inline-block;
            background: var(--text-heading);
            color: white !important;
            padding: 12px 28px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 1rem;
            transition: all var(--transition);
        }

        .btn-contact:hover {
            background: var(--primary);
            transform: translateY(-1px);
            box-shadow: 0 6px 15px rgba(99,102,241,0.3);
        }

        /* Footer */
        .footer {
            background-color: #ffffff;
            border-top: 1px solid var(--border);
            padding: 60px 2rem 30px 2rem;
            font-size: 0.9rem;
            color: var(--text-body);
        }

        .footer-container {
            max-width: 1280px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            gap: 2rem;
            flex-wrap: wrap;
        }

        .footer-brand {
            max-width: 360px;
        }

        .footer-brand h4 {
            font-size: 1.2rem;
            color: var(--text-heading);
            margin-bottom: 1rem;
        }

        .footer-links h5 {
            color: var(--text-heading);
            font-size: 0.95rem;
            margin-bottom: 1rem;
        }

        .footer-links ul {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 0.5rem;
        }

        .footer-bottom {
            max-width: 1280px;
            margin: 40px auto 0 auto;
            padding-top: 20px;
            border-top: 1px solid var(--border);
            text-align: center;
            font-size: 0.85rem;
            color: #94a3b8;
        }

        @media (max-width: 768px) {
            .nav-menu {
                display: none;
            }
            .quick-nav-grid {
                grid-template-columns: 1fr;
            }
            .tools-grid {
                grid-template-columns: 1fr;
            }
        }