/* 基础重置与涂鸦风变量 */
        :root {
            --primary: #ff5e36;
            --primary-dark: #e04822;
            --secondary: #ffc72c;
            --accent-blue: #3b82f6;
            --accent-purple: #8b5cf6;
            --accent-green: #10b981;
            --bg-light: #fffdf9;
            --bg-card: #ffffff;
            --bg-secondary: #f4efe6;
            --text-dark: #1e293b;
            --text-muted: #64748b;
            --border-doodle: 2px solid #1e293b;
            --shadow-doodle: 4px 4px 0px #1e293b;
            --shadow-doodle-hover: 6px 6px 0px #1e293b;
            --radius-doodle: 16px;
            --container-width: 1200px;
        }

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

        html {
            scroll-behavior: smooth;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-light);
            color: var(--text-dark);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
        }

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

        /* 涂鸦风徽章与标题装饰 */
        .doodle-badge {
            display: inline-block;
            background-color: var(--secondary);
            color: var(--text-dark);
            font-weight: 800;
            font-size: 0.85rem;
            padding: 4px 12px;
            border: var(--border-doodle);
            border-radius: 20px;
            box-shadow: 2px 2px 0px #1e293b;
            margin-bottom: 12px;
            text-transform: uppercase;
        }

        .section-header {
            text-align: center;
            margin-bottom: 48px;
        }

        .section-header h2 {
            font-size: 2.2rem;
            font-weight: 900;
            color: var(--text-dark);
            position: relative;
            display: inline-block;
        }

        .section-header h2::after {
            content: '';
            display: block;
            height: 8px;
            background: var(--primary);
            border-radius: 4px;
            margin-top: 4px;
            opacity: 0.8;
        }

        .section-header p {
            color: var(--text-muted);
            font-size: 1.05rem;
            margin-top: 8px;
        }

        /* 按钮与交互 */
        .btn-doodle {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            background-color: var(--primary);
            color: #ffffff;
            font-weight: 700;
            padding: 12px 28px;
            border: var(--border-doodle);
            border-radius: var(--radius-doodle);
            box-shadow: var(--shadow-doodle);
            text-decoration: none;
            cursor: pointer;
            transition: all 0.2s ease;
            font-size: 1rem;
        }

        .btn-doodle:hover {
            transform: translate(-2px, -2px);
            box-shadow: var(--shadow-doodle-hover);
            background-color: var(--primary-dark);
            color: #ffffff;
        }

        .btn-secondary-doodle {
            background-color: #ffffff;
            color: var(--text-dark);
        }

        .btn-secondary-doodle:hover {
            background-color: var(--secondary);
            color: var(--text-dark);
        }

        /* 顶部导航 (强制要求 .nav-links gap: 0) */
        header.site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background-color: rgba(255, 253, 249, 0.95);
            backdrop-filter: blur(8px);
            border-bottom: var(--border-doodle);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 76px;
        }

        .brand-logo-wrap {
            display: flex;
            align-items: center;
            gap: 12px;
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 900;
            font-size: 1.25rem;
        }

        .ai-page-logo {
            height: 42px;
            width: auto;
            display: block;
        }

        .nav-links {
            display: flex;
            align-items: center;
            list-style: none;
            gap: 0; /* 满足约束规则：.nav-links 的 gap 属性设置为 0 */
        }

        .nav-links li {
            margin: 0 8px;
        }

        .nav-links a {
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 700;
            font-size: 0.95rem;
            padding: 8px 12px;
            border-radius: 8px;
            transition: background-color 0.2s ease;
        }

        .nav-links a:hover {
            background-color: var(--secondary);
        }

        .nav-cta {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .mobile-toggle {
            display: none;
            background: none;
            border: var(--border-doodle);
            border-radius: 8px;
            padding: 6px 10px;
            font-weight: 900;
            font-size: 1.2rem;
            cursor: pointer;
        }

        /* 首屏 Hero 区域 (严格禁止包含 <img> 元素) */
        .hero-section {
            padding: 80px 0 60px;
            background: radial-gradient(circle at 10% 20%, rgba(255, 199, 44, 0.15) 0%, rgba(255, 94, 54, 0.08) 90%);
            border-bottom: var(--border-doodle);
            position: relative;
        }

        .hero-content {
            text-align: center;
            max-width: 900px;
            margin: 0 auto;
        }

        .hero-title-tag {
            background: #ffffff;
            border: var(--border-doodle);
            box-shadow: 3px 3px 0px #1e293b;
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 0.9rem;
            font-weight: 800;
            color: var(--primary);
            display: inline-block;
            margin-bottom: 20px;
        }

        /* H1 约束 20字以内 */
        .hero-section h1 {
            font-size: 2.8rem;
            font-weight: 900;
            line-height: 1.25;
            color: var(--text-dark);
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

        .hero-subtitle {
            font-size: 1.2rem;
            color: var(--text-muted);
            margin-bottom: 32px;
            font-weight: 500;
            max-width: 760px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-actions {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 40px;
        }

        .official-btn {
            background-color: var(--accent-purple);
            box-shadow: var(--shadow-doodle);
        }

        .official-btn:hover {
            background-color: #7c3aed;
        }

        .hero-features-list {
            display: flex;
            justify-content: center;
            gap: 24px;
            flex-wrap: wrap;
            margin-top: 30px;
        }

        .hero-feature-item {
            background: #ffffff;
            border: var(--border-doodle);
            box-shadow: 2px 2px 0px #1e293b;
            border-radius: 12px;
            padding: 8px 16px;
            font-size: 0.9rem;
            font-weight: 700;
        }

        /* 通用卡片与网格 */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }

        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 28px;
        }

        .doodle-card {
            background: var(--bg-card);
            border: var(--border-doodle);
            border-radius: var(--radius-doodle);
            box-shadow: var(--shadow-doodle);
            padding: 24px;
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        .doodle-card:hover {
            transform: translateY(-4px);
            box-shadow: var(--shadow-doodle-hover);
        }

        /* 规则模块通用间距 */
        .section-block {
            padding: 70px 0;
            border-bottom: var(--border-doodle);
        }

        .section-block.alt-bg {
            background-color: var(--bg-secondary);
        }

        /* 数据指标卡片 */
        .stat-number {
            font-size: 2.4rem;
            font-weight: 900;
            color: var(--primary);
            line-height: 1;
            margin-bottom: 8px;
        }

        .stat-label {
            font-weight: 700;
            color: var(--text-dark);
        }

        /* 模型标签墙 */
        .model-tags-wrapper {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 20px;
        }

        .model-tag {
            background: #ffffff;
            border: var(--border-doodle);
            border-radius: 30px;
            padding: 6px 14px;
            font-weight: 700;
            font-size: 0.88rem;
            box-shadow: 2px 2px 0px #1e293b;
        }

        /* 案例与图文卡片 */
        .media-card-img-wrap {
            border: var(--border-doodle);
            border-radius: 12px;
            overflow: hidden;
            margin-bottom: 16px;
            background-color: #f1f5f9;
        }

        .media-card-img-wrap img {
            width: 100%;
            height: auto;
            display: block;
            object-fit: cover;
        }

        /* 对比评测高亮 */
        .rating-box {
            background: var(--secondary);
            border: var(--border-doodle);
            border-radius: var(--radius-doodle);
            box-shadow: var(--shadow-doodle);
            padding: 30px;
            text-align: center;
            margin-bottom: 32px;
        }

        .rating-score {
            font-size: 4rem;
            font-weight: 900;
            line-height: 1;
            color: var(--text-dark);
        }

        .rating-stars {
            font-size: 1.8rem;
            color: var(--primary);
            margin: 8px 0;
        }

        .compare-table-wrap {
            overflow-x: auto;
            border: var(--border-doodle);
            border-radius: var(--radius-doodle);
            box-shadow: var(--shadow-doodle);
            background: #ffffff;
        }

        .compare-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }

        .compare-table th, .compare-table td {
            padding: 16px 20px;
            border-bottom: 1px solid #e2e8f0;
            border-right: 1px solid #e2e8f0;
        }

        .compare-table th {
            background: #f8fafc;
            font-weight: 800;
            font-size: 1rem;
        }

        .compare-table th:nth-child(2), .compare-table td:nth-child(2) {
            background: rgba(255, 94, 54, 0.05);
            font-weight: 700;
        }

        /* 折叠 FAQ 面板 */
        .faq-accordion {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .faq-item {
            background: #ffffff;
            border: var(--border-doodle);
            border-radius: 12px;
            box-shadow: var(--shadow-doodle);
            overflow: hidden;
        }

        .faq-question {
            padding: 18px 24px;
            font-weight: 800;
            font-size: 1.05rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            background: #ffffff;
        }

        .faq-answer {
            padding: 0 24px 18px;
            color: var(--text-muted);
            display: none;
            border-top: 1px dashed #cbd5e1;
            margin-top: 8px;
            padding-top: 14px;
        }

        .faq-item.active .faq-answer {
            display: block;
        }

        .faq-item.active .faq-toggle-icon {
            transform: rotate(45deg);
        }

        .faq-toggle-icon {
            font-size: 1.4rem;
            font-weight: 900;
            transition: transform 0.2s ease;
        }

        /* 评论卡片 */
        .testimonial-author {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 16px;
        }

        .avatar-placeholder {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            border: var(--border-doodle);
            background: var(--secondary);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 900;
        }

        /* 表单样式 */
        .form-wrapper {
            background: #ffffff;
            border: var(--border-doodle);
            border-radius: var(--radius-doodle);
            box-shadow: var(--shadow-doodle);
            padding: 36px;
            max-width: 800px;
            margin: 0 auto;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            font-weight: 800;
            margin-bottom: 8px;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: var(--border-doodle);
            border-radius: 10px;
            font-size: 1rem;
            background-color: var(--bg-light);
            outline: none;
        }

        .form-control:focus {
            background-color: #ffffff;
            border-color: var(--primary);
        }

        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }

        /* 文章列表 */
        .article-link-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .article-link-list li a {
            display: block;
            background: #ffffff;
            border: var(--border-doodle);
            border-radius: 10px;
            padding: 14px 20px;
            text-decoration: none;
            color: var(--text-dark);
            font-weight: 700;
            box-shadow: 2px 2px 0px #1e293b;
            transition: all 0.2s ease;
        }

        .article-link-list li a:hover {
            transform: translateX(4px);
            background: var(--secondary);
        }

        /* 页脚 */
        footer.site-footer {
            background-color: #1e293b;
            color: #f8fafc;
            padding: 60px 0 30px;
            border-top: var(--border-doodle);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: #ffffff;
            font-size: 1.1rem;
            margin-bottom: 16px;
            position: relative;
            padding-bottom: 8px;
        }

        .footer-col h4::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 30px;
            height: 4px;
            background: var(--primary);
            border-radius: 2px;
        }

        .footer-links {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
        }

        .footer-links a {
            color: #cbd5e1;
            text-decoration: none;
            font-size: 0.9rem;
            transition: color 0.2s ease;
        }

        .footer-links a:hover {
            color: var(--secondary);
        }

        .friend-links-flex {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 10px;
        }

        .friend-links-flex a {
            color: #94a3b8;
            background: #334155;
            padding: 4px 10px;
            border-radius: 6px;
            text-decoration: none;
            font-size: 0.85rem;
            border: 1px solid #475569;
        }

        .friend-links-flex a:hover {
            color: #ffffff;
            background: var(--primary);
        }

        .footer-bottom {
            border-top: 1px solid #334155;
            padding-top: 24px;
            text-align: center;
            font-size: 0.88rem;
            color: #94a3b8;
        }

        /* 浮动客服 */
        .floating-kefu {
            position: fixed;
            right: 20px;
            bottom: 20px;
            z-index: 999;
            background: #ffffff;
            border: var(--border-doodle);
            box-shadow: var(--shadow-doodle);
            border-radius: var(--radius-doodle);
            padding: 12px;
            text-align: center;
            max-width: 140px;
        }

        .floating-kefu img {
            width: 100px;
            height: 100px;
            display: block;
            margin: 0 auto 6px;
            border-radius: 8px;
        }

        .floating-kefu span {
            font-size: 0.8rem;
            font-weight: 800;
            display: block;
        }

        /* 响应式适配 */
        @media (max-width: 992px) {
            .grid-4, .grid-3 {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .hero-section h1 {
                font-size: 2.2rem;
            }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 76px;
                left: 0;
                width: 100%;
                background: #ffffff;
                border-bottom: var(--border-doodle);
                flex-direction: column;
                padding: 20px;
            }
            .nav-links.show {
                display: flex;
            }
            .nav-links li {
                margin: 8px 0;
                width: 100%;
                text-align: center;
            }
            .mobile-toggle {
                display: block;
            }
            .grid-4, .grid-3, .grid-2 {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .hero-section h1 {
                font-size: 1.8rem;
            }
        }