:root {
            --primary: #FFB800;
            --primary-hover: #E6A600;
            --primary-accent: #FFF3C4;
            --dark-main: #0F172A;
            --dark-card: #1E293B;
            --text-title: #0F172A;
            --text-body: #334155;
            --text-muted: #64748B;
            --bg-base: #F8FAFC;
            --bg-white: #FFFFFF;
            --border-color: #E2E8F0;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-subtle: 0 4px 20px -2px rgba(15, 23, 42, 0.05);
            --shadow-hover: 0 12px 28px -4px rgba(255, 184, 0, 0.25);
            --container-width: 1200px;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-base);
            color: var(--text-body);
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
        }

        /* 统一容器 */
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 20px;
            width: 100%;
        }

        /* 顶部导航 */
        .header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
        }
        .ai-page-logo {
            height: 40px;
            width: auto;
        }
        .brand-name {
            font-size: 20px;
            font-weight: 800;
            color: var(--dark-main);
            letter-spacing: -0.5px;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 20px;
            list-style: none;
        }
        .nav-link {
            text-decoration: none;
            color: var(--text-body);
            font-size: 14px;
            font-weight: 500;
            transition: color 0.2s ease;
        }
        .nav-link:hover {
            color: #D97706;
        }
        .nav-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        /* 通用按钮 */
        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 10px 22px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 15px;
            text-decoration: none;
            transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
            cursor: pointer;
            border: 1px solid transparent;
            white-space: nowrap;
        }
        .btn-yellow {
            background-color: var(--primary);
            color: var(--dark-main);
            box-shadow: 0 4px 14px rgba(255, 184, 0, 0.35);
        }
        .btn-yellow:hover {
            background-color: var(--primary-hover);
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 184, 0, 0.45);
        }
        .btn-dark {
            background-color: var(--dark-main);
            color: #FFFFFF;
        }
        .btn-dark:hover {
            background-color: #1E293B;
            transform: translateY(-2px);
        }
        .btn-outline {
            border-color: var(--dark-main);
            color: var(--dark-main);
            background: transparent;
        }
        .btn-outline:hover {
            background: var(--dark-main);
            color: #FFFFFF;
        }

        /* Hero 首屏 - 严格禁止图片 */
        .hero-section {
            padding: 90px 0 70px;
            background: radial-gradient(circle at 50% 10%, #FFFBEB 0%, #F8FAFC 80%);
            border-bottom: 1px solid var(--border-color);
            text-align: center;
            position: relative;
        }
        .hero-badge-wrap {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: #FEF3C7;
            border: 1px solid #FDE047;
            color: #854D0E;
            padding: 6px 16px;
            border-radius: 50px;
            font-size: 13px;
            font-weight: 700;
            margin-bottom: 24px;
        }
        .hero-title {
            font-size: 40px;
            font-weight: 900;
            color: var(--dark-main);
            letter-spacing: -1px;
            line-height: 1.2;
            margin-bottom: 20px;
        }
        .hero-subtitle {
            font-size: 18px;
            color: var(--text-body);
            max-width: 860px;
            margin: 0 auto 36px;
            line-height: 1.6;
        }
        .hero-tags {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 8px;
            max-width: 900px;
            margin: 0 auto 40px;
        }
        .hero-tag {
            background: #FFFFFF;
            border: 1px solid #E2E8F0;
            color: var(--dark-main);
            font-size: 12px;
            font-weight: 600;
            padding: 4px 12px;
            border-radius: 6px;
            transition: all 0.2s ease;
        }
        .hero-tag:hover {
            border-color: var(--primary);
            background: var(--primary-accent);
        }
        .hero-cta-group {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 50px;
        }
        .hero-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            padding: 24px;
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-subtle);
        }
        .stat-item h4 {
            font-size: 28px;
            font-weight: 800;
            color: var(--dark-main);
        }
        .stat-item p {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 模组通用样式 */
        .section {
            padding: 80px 0;
            border-bottom: 1px solid #EEF2F6;
        }
        .section-header {
            text-align: center;
            max-width: 760px;
            margin: 0 auto 50px;
        }
        .section-tag {
            display: inline-block;
            color: #D97706;
            background: #FEF3C7;
            font-size: 13px;
            font-weight: 700;
            padding: 4px 12px;
            border-radius: 4px;
            margin-bottom: 12px;
            text-transform: uppercase;
        }
        .section-title {
            font-size: 30px;
            font-weight: 800;
            color: var(--dark-main);
            margin-bottom: 14px;
            letter-spacing: -0.5px;
        }
        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
        }

        /* 网格系统 */
        .grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
        .grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
        .grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

        /* 卡片设计 */
        .card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: all 0.3s ease;
            box-shadow: var(--shadow-subtle);
        }
        .card:hover {
            border-color: var(--primary);
            transform: translateY(-4px);
            box-shadow: var(--shadow-hover);
        }
        .card-icon {
            width: 48px;
            height: 48px;
            background: var(--primary-accent);
            color: var(--dark-main);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
            font-size: 20px;
            margin-bottom: 20px;
        }
        .card h3 {
            font-size: 20px;
            font-weight: 700;
            color: var(--dark-main);
            margin-bottom: 10px;
        }
        .card p {
            font-size: 14px;
            color: var(--text-body);
        }

        /* 对比评测高亮 */
        .rating-banner {
            background: linear-gradient(135deg, #1E293B 0%, #0F172A 100%);
            color: #FFFFFF;
            border-radius: var(--radius-lg);
            padding: 32px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 32px;
        }
        .rating-score {
            display: flex;
            align-items: center;
            gap: 20px;
        }
        .score-num {
            font-size: 56px;
            font-weight: 900;
            color: var(--primary);
            line-height: 1;
        }
        .stars {
            color: var(--primary);
            font-size: 24px;
            margin-bottom: 4px;
        }

        /* 表格排版 */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            background: #FFFFFF;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
        }
        .custom-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            font-size: 14px;
        }
        .custom-table th {
            background: #F1F5F9;
            color: var(--dark-main);
            padding: 16px 20px;
            font-weight: 700;
            border-bottom: 1px solid var(--border-color);
        }
        .custom-table td {
            padding: 16px 20px;
            border-bottom: 1px solid var(--border-color);
            color: var(--text-body);
        }
        .custom-table tr:last-child td { border-bottom: none; }
        .highlight-row { background: #FFFBEB; font-weight: 600; }

        /* FAQ 折叠 */
        .faq-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
            max-width: 900px;
            margin: 0 auto;
        }
        .faq-item {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
        }
        .faq-question {
            padding: 20px 24px;
            font-size: 16px;
            font-weight: 700;
            color: var(--dark-main);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: space-between;
            user-select: none;
        }
        .faq-answer {
            padding: 0 24px 20px;
            font-size: 14px;
            color: var(--text-body);
            display: none;
        }
        .faq-item.active .faq-answer { display: block; }
        .faq-item.active .faq-toggle { transform: rotate(180deg); }

        /* 评论卡片 */
        .review-card {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 24px;
            position: relative;
        }
        .reviewer-info {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 16px;
        }
        .avatar-placeholder {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: var(--dark-main);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 800;
        }

        /* 案例区图片展示 */
        .case-image-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
            margin-top: 30px;
        }
        .case-img-box {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            padding: 12px;
        }

        /* 表单区域 */
        .form-container {
            background: #FFFFFF;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 40px;
            box-shadow: var(--shadow-subtle);
        }
        .form-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        .form-group.full { grid-column: span 2; }
        .form-label {
            font-size: 14px;
            font-weight: 700;
            color: var(--dark-main);
        }
        .form-input, .form-select, .form-textarea {
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 14px;
            outline: none;
            transition: border-color 0.2s ease;
            font-family: inherit;
        }
        .form-input:focus, .form-select:focus, .form-textarea:focus {
            border-color: var(--primary);
        }
        .form-textarea { height: 120px; resize: vertical; }

        /* 页脚区域 */
        .footer {
            background: var(--dark-main);
            color: #94A3B8;
            padding: 60px 0 30px;
            font-size: 14px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-brand h3 {
            color: #FFFFFF;
            font-size: 22px;
            font-weight: 800;
            margin-bottom: 12px;
        }
        .footer-title {
            color: #FFFFFF;
            font-size: 16px;
            font-weight: 700;
            margin-bottom: 16px;
        }
        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        .footer-links a {
            color: #94A3B8;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        .footer-links a:hover { color: var(--primary); }
        .footer-bottom {
            border-top: 1px solid #334155;
            padding-top: 30px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
        }
        .friend-links-box {
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
        }
        .friend-links-box a {
            color: #94A3B8;
            text-decoration: none;
        }
        .friend-links-box a:hover { color: #FFFFFF; }

        /* 浮动组件 */
        .floating-kefu {
            position: fixed;
            right: 24px;
            bottom: 24px;
            z-index: 999;
            background: var(--primary);
            color: var(--dark-main);
            padding: 12px 20px;
            border-radius: 50px;
            box-shadow: 0 8px 24px rgba(0,0,0,0.15);
            font-weight: 800;
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
            cursor: pointer;
        }

        /* 响应式适配 */
        @media (max-width: 992px) {
            .grid-4 { grid-template-columns: repeat(2, 1fr); }
            .grid-3 { grid-template-columns: repeat(1, 1fr); }
            .hero-title { font-size: 32px; }
            .hero-stats { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }
        @media (max-width: 768px) {
            .nav-menu { display: none; }
            .grid-2 { grid-template-columns: 1fr; }
            .rating-banner { flex-direction: column; text-align: center; gap: 16px; }
            .form-grid { grid-template-columns: 1fr; }
            .form-group.full { grid-column: span 1; }
            .hero-stats { grid-template-columns: 1fr; }
            .footer-grid { grid-template-columns: 1fr; }
        }