:root {
            --primary-color: #e53e3e;
            --primary-hover: #c53030;
            --text-dark: #2a2a2d;
            --text-muted: #4b5563;
            --bg-light: #f8fafc;
            --bg-gradient: radial-gradient(circle at 80% 50%, #e0f2fe 0%, #ffffff 70%);
            --card-bg: #ffffff;
            --border-color: #e2e8f0;
            --accent-blue: #2563eb;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Noto Sans SC', sans-serif;
            color: var(--text-dark);
            background-color: #ffffff;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            line-height: 1.7;
        }
        .header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 20px 40px;
            margin: 0 auto;
            width: 100%;
            position: fixed;
            top: 0;
            left: 50%;
            transform: translateX(-50%);
            z-index: 10;
            background: #eff8ff;
            border-bottom: 1px solid rgba(62, 95, 255, 0.1);
        }
        .header-left, .header-right {
            display: flex;
            align-items: center;
            gap: 32px;
        }
        .logo {
            display: flex;
            align-items: center;
            gap: 8px;
            font-weight: 700;
            font-size: 22px;
            color: #0640b7;
            text-decoration: none;
        }
        .logo img {
            height: 32px;
            width: auto;
            display: block;
        }
        .nav-links {
            display: flex;
            gap: 24px;
            list-style: none;
        }
        .nav-item {
            display: flex;
            align-items: center;
            gap: 4px;
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
        }
        .nav-item a {
            color: var(--text-dark);
            text-decoration: none;
        }
        .nav-secondary {
            display: flex;
            align-items: center;
            gap: 20px;
            list-style: none;
            font-size: 14px;
        }
        .nav-secondary a {
            color: var(--text-dark);
            text-decoration: none;
        }
        .nav-secondary li {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .lang-selector {
            display: flex;
            align-items: center;
            cursor: pointer;
        }
        .btn-primary {
            background-color: var(--primary-color);
            color: #ffffff;
            padding: 10px 24px;
            border-radius: 9999px;
            font-weight: 700;
            text-decoration: none;
            font-size: 14px;
            transition: background-color 0.2s;
            border: none;
            cursor: pointer;
            display: inline-block;
            text-align: center;
        }
        .btn-primary:hover {
            background-color: var(--primary-hover);
        }

        /* ---- FAQ Hero 区域 ---- */
        .faq-hero {
            background: var(--bg-gradient);
            padding: 180px 40px 60px 40px;
            border-bottom: 1px solid var(--border-color);
            text-align: center;
        }
        .faq-hero-container {
            max-width: 800px;
            margin: 0 auto;
        }
        .faq-hero h1 {
            font-size: 42px;
            font-weight: 700;
            color: #0f172a;
            margin-bottom: 16px;
        }
        .faq-hero p {
            font-size: 18px;
            color: var(--text-muted);
            margin-bottom: 32px;
        }
        .faq-search {
            display: flex;
            max-width: 480px;
            margin: 0 auto 24px auto;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
            border-radius: 12px;
            overflow: hidden;
        }
        .faq-search-input {
            flex: 1;
            padding: 14px 20px;
            border: 1px solid var(--border-color);
            border-right: none;
            border-radius: 12px 0 0 12px;
            font-size: 15px;
            outline: none;
            transition: border-color 0.2s;
        }
        .faq-search-input:focus {
            border-color: var(--accent-blue);
        }
        .faq-search-btn {
            background-color: var(--accent-blue);
            color: #ffffff;
            border: none;
            padding: 0 20px;
            cursor: pointer;
            border-radius: 0 12px 12px 0;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background-color 0.2s;
        }
        .faq-search-btn:hover {
            background-color: #1d4ed8;
        }
        .faq-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 10px;
            margin-top: 8px;
        }
        .faq-tag {
            background-color: #ffffff;
            border: 1px solid var(--border-color);
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 13px;
            color: var(--text-muted);
            cursor: pointer;
            transition: all 0.2s;
            font-weight: 500;
        }
        .faq-tag:hover {
            background-color: #eff6ff;
            border-color: var(--accent-blue);
            color: var(--accent-blue);
        }

        /* 新增创意版块：快速诊断向导 */
        .quick-diagnose {
            max-width: 900px;
            margin: -30px auto 0 auto;
            padding: 0 40px 40px 40px;
            position: relative;
            z-index: 2;
        }
        .diagnose-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
        }
        .diagnose-card {
            background: #ffffff;
            border-radius: 16px;
            padding: 28px 20px;
            text-align: center;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 12px rgba(0,0,0,0.02);
            transition: all 0.25s;
        }
        .diagnose-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 24px rgba(0,0,0,0.06);
            border-color: var(--accent-blue);
        }
        .diagnose-icon {
            font-size: 36px;
            margin-bottom: 12px;
        }
        .diagnose-card h3 {
            font-size: 18px;
            font-weight: 700;
            color: #1e293b;
            margin-bottom: 8px;
        }
        .diagnose-card p {
            font-size: 14px;
            color: var(--text-muted);
            line-height: 1.5;
        }

        /* ---- FAQ 列表主体 ---- */
        .faq-layout {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 40px 60px 40px;
        }
        .faq-section-title {
            font-size: 24px;
            font-weight: 700;
            color: #0f172a;
            margin: 40px 0 20px 0;
            padding-bottom: 8px;
            border-bottom: 2px solid #e2e8f0;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .faq-section-title:first-of-type {
            margin-top: 0;
        }
        .faq-group {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .faq-item {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            overflow: hidden;
            transition: border-color 0.2s, box-shadow 0.2s;
        }
        .faq-item:hover {
            border-color: #cbd5e1;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
        }
        .faq-question {
            padding: 24px;
            font-size: 18px;
            font-weight: 700;
            color: #1e293b;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
        }
        .faq-icon {
            width: 24px;
            height: 24px;
            transition: transform 0.2s;
            fill: none;
            stroke: currentColor;
            stroke-width: 2;
            flex-shrink: 0;
        }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease;
            background: #f8fafc;
        }
        .faq-answer-content {
            padding: 0 24px 24px 24px;
            color: #475569;
            font-size: 15px;
            line-height: 1.6;
            border-top: 1px solid var(--border-color);
            margin-top: -1px;
        }
        .faq-answer-content p {
            margin-bottom: 12px;
            margin-top: 20px;
        }
        .faq-answer-content p:first-child {
            margin-top: 24px;
        }
        .faq-answer-content ul {
            margin-left: 20px;
            margin-bottom: 12px;
        }
        .faq-answer-content li {
            margin-bottom: 6px;
        }
        .faq-item.active .faq-icon {
            transform: rotate(180deg);
        }
        .faq-item.active .faq-answer {
            max-height: 2000px;
        }

        /* 联系客服创意版块 */
        .faq-contact-banner {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            border-radius: 16px;
            padding: 40px;
            margin-top: 60px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            color: #ffffff;
            gap: 32px;
        }
        .contact-text h3 {
            font-size: 22px;
            font-weight: 700;
            margin-bottom: 8px;
        }
        .contact-text p {
            color: #cbd5e1;
            font-size: 15px;
        }
        .contact-btn {
            background-color: #ffffff;
            color: #0f172a;
            padding: 12px 28px;
            border-radius: 9999px;
            font-weight: 700;
            text-decoration: none;
            white-space: nowrap;
            transition: background-color 0.2s;
        }
        .contact-btn:hover {
            background-color: #e2e8f0;
        }

        /* ---- 页脚 ---- */
        .site-footer {
            background-color: #0b0e17;
            color: #9ca3af;
            padding: 80px 40px 40px 40px;
            margin-top: 100px;
        }
        .footer-container {
            max-width: 1200px;
            margin: 0 auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 40px;
            border-bottom: 1px solid #22293a;
            padding-bottom: 48px;
        }
        .footer-col h4 {
            color: #ffffff;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 24px;
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        .footer-links a {
            color: #9ca3af;
            text-decoration: none;
            font-size: 14px;
            transition: color 0.2s;
        }
        .footer-links a:hover {
            color: #ffffff;
        }

        /* ---- 响应式 ---- */
        @media (max-width: 1024px) {
            .diagnose-grid {
                grid-template-columns: 1fr;
                max-width: 400px;
                margin: 0 auto;
            }
            .faq-contact-banner {
                flex-direction: column;
                text-align: center;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .nav-links, .nav-secondary {
                display: none;
            }
            .faq-hero {
                padding: 140px 20px 40px 20px;
            }
            .faq-layout {
                padding: 0 20px 40px 20px;
            }
            .faq-hero h1 {
                font-size: 30px;
            }
            .faq-question {
                font-size: 16px;
                padding: 20px;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }