/* ========== 全局基础样式（与首页保持一致） ========== */
        :root {
            --primary-color: #2563eb;
            --primary-hover: #1d4ed8;
            --primary-light: #dbeafe;
            --accent-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
            --text-main: #111827;
            --text-muted: #4b5563;
            --text-light: #6b7280;
            --bg-light: #f9fafb;
            --bg-white: #ffffff;
            --border-color: #e5e7eb;
            --border-light: #f3f4f6;
            --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
            --shadow-md: 0 4px 20px rgba(37, 99, 235, 0.08);
            --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.1);
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 20px;
            --radius-full: 50px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
            color: var(--text-main);
            line-height: 1.7;
            background-color: var(--bg-white);
            overflow-x: hidden;
        }
        a { text-decoration: none; color: inherit; transition: var(--transition); }
        .container { max-width: 1140px; margin: 0 auto; padding: 0 24px; }

        /* 导航 */
        header {
            border-bottom: 1px solid var(--border-light);
            position: sticky; top: 0;
            background-color: rgba(255, 255, 255, 0.92);
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            z-index: 1000;
            transition: var(--transition);
        }
        header.scrolled { box-shadow: 0 2px 20px rgba(0, 0, 0, 0.06); }
        .nav-wrapper { display: flex; justify-content: space-between; align-items: center; height: 72px; gap: 20px; }
        .logo-container { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
        .logo-svg { width: 36px; height: 36px; filter: drop-shadow(0 2px 6px rgba(37, 99, 235, 0.3)); transition: var(--transition); }
        .logo-container:hover .logo-svg { transform: scale(1.05); }
        .logo-text { font-size: 22px; font-weight: 700; color: var(--primary-color); letter-spacing: -0.5px; white-space: nowrap; }
        .logo-text span { background: var(--accent-gradient); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
        nav ul { display: flex; list-style: none; gap: 22px; align-items: center; }
        nav a { font-weight: 500; color: var(--text-muted); font-size: 14px; transition: var(--transition); position: relative; padding: 6px 2px; white-space: nowrap; }
        nav a::after { content: ''; position: absolute; bottom: -2px; left: 50%; transform: translateX(-50%); width: 0; height: 2px; background: var(--accent-gradient); border-radius: 2px; transition: var(--transition); }
        nav a:hover, nav a.active { color: var(--primary-color); }
        nav a:hover::after, nav a.active::after { width: 100%; }

        /* ========== 常见问题 Hero ========== */
        .faq-hero {
            background: linear-gradient(135deg, #0b1120 0%, #1e3a8a 50%, #2563eb 100%);
            color: #fff;
            padding: 90px 0 80px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .faq-hero::before {
            content: '';
            position: absolute;
            top: -50%; left: -50%;
            width: 200%; height: 200%;
            background: radial-gradient(circle at 50% 40%, rgba(255,255,255,0.08) 0%, transparent 60%);
            pointer-events: none;
            animation: fadePulse 7s ease-in-out infinite alternate;
        }
        @keyframes fadePulse {
            0% { opacity: 0.5; transform: scale(1); }
            100% { opacity: 1; transform: scale(1.1); }
        }
        .faq-hero .container { position: relative; z-index: 2; }
        .faq-hero h1 {
            font-size: 44px;
            font-weight: 800;
            letter-spacing: -1.5px;
            margin-bottom: 18px;
            background: linear-gradient(135deg, #ffffff 0%, #dbeafe 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .faq-hero p {
            font-size: 18px;
            color: rgba(255,255,255,0.85);
            max-width: 750px;
            margin: 0 auto 30px;
            line-height: 1.8;
        }
        .hero-badge-faq {
            display: inline-block;
            background: rgba(255,255,255,0.15);
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255,255,255,0.25);
            color: #fff;
            padding: 6px 20px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 600;
            letter-spacing: 0.5px;
            margin-bottom: 28px;
        }
        .search-box {
            max-width: 500px;
            margin: 0 auto;
            background: rgba(255,255,255,0.15);
            border: 1px solid rgba(255,255,255,0.3);
            border-radius: 50px;
            padding: 8px 8px 8px 20px;
            display: flex;
            align-items: center;
            gap: 10px;
            backdrop-filter: blur(10px);
            transition: var(--transition);
        }
        .search-box:focus-within {
            background: rgba(255,255,255,0.25);
            box-shadow: 0 8px 30px rgba(0,0,0,0.2);
        }
        .search-box input {
            flex: 1;
            background: transparent;
            border: none;
            outline: none;
            color: #fff;
            font-size: 16px;
            padding: 10px 0;
        }
        .search-box input::placeholder { color: rgba(255,255,255,0.7); }
        .search-box button {
            background: #fff;
            border: none;
            border-radius: 50px;
            padding: 10px 24px;
            font-weight: 700;
            color: #2563eb;
            cursor: pointer;
            transition: var(--transition);
            font-size: 14px;
            white-space: nowrap;
        }
        .search-box button:hover { background: #f0f4ff; }

        /* 通用标题 */
        .section-title { text-align: center; font-size: 32px; margin-bottom: 14px; letter-spacing: -0.8px; font-weight: 800; color: var(--text-main); }
        .section-subtitle { text-align: center; font-size: 16px; color: var(--text-muted); max-width: 600px; margin: 0 auto 48px; line-height: 1.7; }

        /* ========== 分类导航 ========== */
        .faq-categories {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
            margin-bottom: 40px;
        }
        .category-pill {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #fff;
            border: 2px solid var(--border-color);
            border-radius: var(--radius-full);
            padding: 10px 22px;
            font-weight: 600;
            color: var(--text-muted);
            cursor: pointer;
            transition: var(--transition);
            font-size: 14px;
        }
        .category-pill:hover, .category-pill.active {
            border-color: var(--primary-color);
            color: var(--primary-color);
            background: var(--primary-light);
        }

        /* ========== FAQ 手风琴 ========== */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-item {
            background: #fff;
            border-radius: 16px;
            border: 1px solid #eef2f6;
            overflow: hidden;
            margin-bottom: 14px;
            transition: var(--transition);
            box-shadow: 0 4px 16px rgba(0,0,0,0.02);
        }
        .faq-item:hover { border-color: #dbeafe; }
        .faq-question {
            width: 100%;
            background: none;
            border: none;
            padding: 18px 24px;
            text-align: left;
            font-size: 16px;
            font-weight: 700;
            color: #0f172a;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            transition: var(--transition);
            font-family: inherit;
        }
        .faq-question:hover { color: var(--primary-color); }
        .faq-icon {
            font-size: 22px;
            font-weight: 300;
            transition: var(--transition);
            flex-shrink: 0;
            margin-left: 12px;
        }
        .faq-item.active .faq-icon { transform: rotate(45deg); color: var(--primary-color); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease;
            color: #475569;
            font-size: 14px;
            line-height: 1.7;
        }
        .faq-item.active .faq-answer {
            max-height: 500px;
            padding: 0 24px 20px;
        }
        .faq-answer ol, .faq-answer ul { padding-left: 20px; margin-top: 8px; }
        .faq-answer li { margin-bottom: 6px; }

        /* ========== 自助诊断工具 ========== */
        .diagnostic-tool {
            background: #fff;
            border-radius: 24px;
            padding: 32px 28px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.03);
            border: 1px solid #eef2f6;
            margin-top: 40px;
        }
        .diagnostic-step {
            display: flex;
            gap: 16px;
            margin-bottom: 20px;
            align-items: flex-start;
        }
        .diag-number {
            width: 36px;
            height: 36px;
            background: var(--accent-gradient);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            flex-shrink: 0;
        }
        .diag-content h5 {
            font-size: 16px;
            font-weight: 700;
            color: #0f172a;
            margin-bottom: 4px;
        }
        .diag-content p {
            font-size: 14px;
            color: #475569;
        }
        .diag-button {
            display: inline-block;
            margin-top: 10px;
            background: #eff6ff;
            color: #2563eb;
            border: none;
            border-radius: 20px;
            padding: 8px 20px;
            font-weight: 600;
            cursor: pointer;
            font-size: 13px;
            transition: var(--transition);
        }
        .diag-button:hover { background: #dbeafe; }

        /* ========== 快速解决卡片 ========== */
        .quick-fix-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
            gap: 24px;
            margin-top: 40px;
        }
        .quick-card {
            background: #fff;
            border-radius: 20px;
            padding: 26px 22px;
            text-align: center;
            border: 1px solid #eef2f6;
            transition: var(--transition);
        }
        .quick-card:hover {
            border-color: #bfdbfe;
            box-shadow: 0 12px 30px rgba(37,99,235,0.08);
            transform: translateY(-3px);
        }
        .quick-icon { font-size: 32px; margin-bottom: 14px; }
        .quick-card h4 { font-size: 17px; font-weight: 700; margin-bottom: 8px; color: #0f172a; }
        .quick-card p { font-size: 13px; color: #475569; line-height: 1.6; }

        /* ========== 页脚 ========== */
        footer {
            border-top: 1px solid var(--border-light);
            padding: 50px 0 30px;
            text-align: center;
            color: var(--text-muted);
            font-size: 13px;
            background-color: var(--bg-light);
        }
        .footer-links {
            margin-bottom: 20px;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 14px;
        }
        .footer-links a { color: var(--text-muted); font-weight: 500; font-size: 13px; transition: var(--transition); }
        .footer-links a:hover { color: var(--primary-color); }
        .footer-brand { font-weight: 700; color: var(--text-main); font-size: 14px; margin-bottom: 6px; }
        .footer-domain { color: var(--text-light); font-size: 12px; margin-bottom: 16px; }

        /* 响应式 */
        @media (max-width: 1024px) {
            nav ul { gap: 14px; }
            nav a { font-size: 13px; }
            .faq-hero h1 { font-size: 36px; }
        }
        @media (max-width: 768px) {
            .faq-hero { padding: 60px 0 50px; }
            .faq-hero h1 { font-size: 28px; letter-spacing: -0.5px; }
            .faq-hero p { font-size: 16px; }
            .section-title { font-size: 24px; }
            nav ul { gap: 10px; overflow-x: auto; -webkit-overflow-scrolling: touch; padding-bottom: 4px; }
            nav a { font-size: 12px; white-space: nowrap; }
            .nav-wrapper { height: 60px; gap: 10px; }
            .logo-text { font-size: 18px; }
            .quick-fix-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 480px) {
            .faq-hero h1 { font-size: 24px; }
            .faq-hero p { font-size: 14px; }
            .logo-text { font-size: 16px; }
            .logo-svg { width: 28px; height: 28px; }
            .container { padding: 0 16px; }
            .quick-fix-grid { grid-template-columns: 1fr; }
        }