/* CSS Variables - Vibrant Orange Style (亮橙炽艳风) */
        :root {
            --primary: #ff5500;
            --primary-hover: #e04b00;
            --primary-light: #fff4ed;
            --secondary: #ff8c00;
            --dark-text: #1e293b;
            --muted-text: #64748b;
            --light-bg: #f8fafc;
            --card-bg: #ffffff;
            --border-color: #e2e8f0;
            --accent-gold: #f59e0b;
            --container-width: 1200px;
            --radius-sm: 8px;
            --radius-md: 12px;
            --radius-lg: 16px;
            --shadow-sm: 0 2px 4px rgba(255, 85, 0, 0.05);
            --shadow-md: 0 10px 25px -5px rgba(255, 85, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.05);
            --shadow-lg: 0 20px 35px -10px rgba(255, 85, 0, 0.15);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

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

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

        body {
            overflow-x: hidden;
            width: 100%;
            background-color: #fafafa;
        }

        /* Unified Container System */
        .container {
            width: 100%;
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Typography & Utilities */
        h1, h2, h3, h4 {
            color: var(--dark-text);
            font-weight: 700;
            line-height: 1.3;
        }

        p {
            color: var(--muted-text);
            font-size: 1.05rem;
        }

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

        a:hover {
            color: var(--primary-hover);
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            font-size: 1rem;
            font-weight: 600;
            border-radius: var(--radius-sm);
            cursor: pointer;
            transition: var(--transition);
            border: none;
            outline: none;
            gap: 8px;
            text-decoration: none;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: #ffffff !important;
            box-shadow: 0 4px 14px rgba(255, 85, 0, 0.35);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(255, 85, 0, 0.5);
        }

        .btn-outline {
            background: #ffffff;
            color: var(--dark-text) !important;
            border: 2px solid var(--border-color);
        }

        .btn-outline:hover {
            border-color: var(--primary);
            color: var(--primary) !important;
            background: var(--primary-light);
        }

        .section-header {
            text-align: center;
            max-width: 760px;
            margin: 0 auto 50px auto;
        }

        .section-tag {
            display: inline-block;
            padding: 4px 14px;
            background-color: var(--primary-light);
            color: var(--primary);
            font-weight: 600;
            font-size: 0.875rem;
            border-radius: 50px;
            margin-bottom: 12px;
            border: 1px solid rgba(255, 85, 0, 0.2);
        }

        .section-title {
            font-size: 2.2rem;
            margin-bottom: 16px;
            position: relative;
        }

        .section-subtitle {
            font-size: 1.1rem;
            color: var(--muted-text);
        }

        section {
            padding: 80px 0;
            position: relative;
        }

        .bg-white {
            background-color: #ffffff;
        }

        .bg-gradient {
            background: linear-gradient(180deg, #ffffff 0%, var(--primary-light) 100%);
        }

        /* 顶部导航 */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid rgba(226, 232, 240, 0.8);
        }

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

        .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
        }

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

        /* Strict Requirement: .nav-links gap must be 0 */
        .nav-links {
            display: flex;
            align-items: center;
            list-style: none;
            margin: 0;
            padding: 0;
            gap: 0; 
        }

        .nav-links li a {
            display: block;
            padding: 10px 14px;
            color: var(--dark-text);
            font-weight: 500;
            font-size: 0.95rem;
            border-radius: var(--radius-sm);
        }

        .nav-links li a:hover {
            color: var(--primary);
            background-color: var(--primary-light);
        }

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

        .mobile-toggle {
            display: none;
            background: none;
            border: none;
            font-size: 1.5rem;
            color: var(--dark-text);
            cursor: pointer;
        }

        /* 首屏 Hero - STRICT NO IMAGES */
        .hero-section {
            padding: 90px 0 80px 0;
            background: radial-gradient(circle at 50% 20%, #fff0e6 0%, #ffffff 70%);
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 6px 18px;
            background: #ffffff;
            border: 1px solid rgba(255, 85, 0, 0.3);
            box-shadow: var(--shadow-sm);
            border-radius: 30px;
            font-size: 0.9rem;
            color: var(--primary);
            font-weight: 600;
            margin-bottom: 24px;
        }

        .hero-h1 {
            font-size: 3rem;
            margin-bottom: 20px;
            color: var(--dark-text);
            letter-spacing: -0.5px;
        }

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

        .hero-desc {
            max-width: 820px;
            margin: 0 auto 36px auto;
            font-size: 1.25rem;
            color: var(--muted-text);
            line-height: 1.7;
        }

        .hero-ctas {
            display: flex;
            justify-content: center;
            align-items: center;
            gap: 16px;
            margin-bottom: 60px;
            flex-wrap: wrap;
        }

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            background: #ffffff;
            padding: 30px;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-color);
        }

        .stat-item {
            text-align: center;
            padding: 10px;
        }

        .stat-num {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 4px;
        }

        .stat-label {
            font-size: 0.9rem;
            color: var(--muted-text);
        }

        /* 平台介绍 & 特性卡片 */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 24px;
        }

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

        .feature-card {
            background: var(--card-bg);
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            padding: 32px;
            transition: var(--transition);
            position: relative;
            box-shadow: var(--shadow-sm);
        }

        .feature-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--shadow-md);
            border-color: rgba(255, 85, 0, 0.4);
        }

        .feature-icon {
            width: 54px;
            height: 54px;
            background: var(--primary-light);
            color: var(--primary);
            border-radius: var(--radius-sm);
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 20px;
        }

        .feature-card h3 {
            font-size: 1.3rem;
            margin-bottom: 12px;
        }

        .feature-card p {
            font-size: 0.98rem;
            color: var(--muted-text);
        }

        /* 模型聚合标签 */
        .model-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 30px;
        }

        .model-chip {
            background: #ffffff;
            border: 1px solid var(--border-color);
            padding: 8px 16px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--dark-text);
            box-shadow: 0 2px 4px rgba(0,0,0,0.02);
            transition: var(--transition);
        }

        .model-chip:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-light);
        }

        /* 标准流程 */
        .process-steps {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }

        .step-card {
            background: #ffffff;
            padding: 28px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            text-align: center;
            position: relative;
        }

        .step-num {
            width: 40px;
            height: 40px;
            background: var(--primary);
            color: #ffffff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            margin: 0 auto 16px auto;
        }

        /* 对比评测 - Strict Requirements: Rating 5 stars, 9.9/10 score */
        .rating-box {
            background: linear-gradient(135deg, #fff6f0, #ffebd8);
            border: 2px solid var(--primary);
            border-radius: var(--radius-md);
            padding: 24px;
            text-align: center;
            margin-bottom: 30px;
            display: flex;
            align-items: center;
            justify-content: space-around;
            flex-wrap: wrap;
            gap: 20px;
        }

        .rating-stars {
            color: var(--accent-gold);
            font-size: 1.8rem;
            letter-spacing: 4px;
        }

        .rating-score {
            font-size: 2.5rem;
            font-weight: 900;
            color: var(--primary);
        }

        .comparison-table-wrapper {
            overflow-x: auto;
            background: #ffffff;
            border-radius: var(--radius-md);
            box-shadow: var(--shadow-md);
            border: 1px solid var(--border-color);
        }

        .comparison-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            min-width: 700px;
        }

        .comparison-table th, .comparison-table td {
            padding: 16px 20px;
            border-bottom: 1px solid var(--border-color);
        }

        .comparison-table th {
            background: #f8fafc;
            font-weight: 700;
            color: var(--dark-text);
        }

        .comparison-table tr.highlight-row {
            background-color: var(--primary-light);
        }

        .comparison-table td.highlight-cell {
            color: var(--primary);
            font-weight: 700;
        }

        /* Token 比价 */
        .token-table-wrapper {
            background: #ffffff;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            overflow-x: auto;
            box-shadow: var(--shadow-sm);
        }

        .token-table {
            width: 100%;
            border-collapse: collapse;
            min-width: 650px;
        }

        .token-table th, .token-table td {
            padding: 14px 18px;
            border-bottom: 1px solid var(--border-color);
            text-align: left;
        }

        .price-badge {
            display: inline-block;
            padding: 2px 8px;
            background: #dcfce7;
            color: #166534;
            border-radius: 4px;
            font-size: 0.85rem;
            font-weight: 600;
        }

        /* 案例展示 - Include Prompt Images */
        .case-card {
            background: #ffffff;
            border-radius: var(--radius-md);
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            transition: var(--transition);
        }

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

        .case-img-holder {
            width: 100%;
            height: 220px;
            overflow: hidden;
            background: #e2e8f0;
        }

        .case-img-holder img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: var(--transition);
        }

        .case-card:hover .case-img-holder img {
            transform: scale(1.05);
        }

        .case-body {
            padding: 20px;
        }

        .case-body h4 {
            font-size: 1.15rem;
            margin-bottom: 8px;
        }

        .banner-gallery {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
            margin-top: 30px;
        }

        .banner-gallery img {
            border-radius: var(--radius-sm);
            width: 100%;
            height: 180px;
            object-fit: cover;
            border: 1px solid var(--border-color);
        }

        /* 评论卡片 - 6 User Reviews */
        .review-card {
            background: #ffffff;
            border-radius: var(--radius-md);
            padding: 24px;
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .review-text {
            font-size: 0.95rem;
            color: var(--dark-text);
            margin-bottom: 20px;
            font-style: italic;
        }

        .reviewer-info {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .reviewer-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background: var(--primary);
            color: #ffffff;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
        }

        .reviewer-meta h5 {
            font-size: 0.95rem;
            color: var(--dark-text);
        }

        .reviewer-meta span {
            font-size: 0.825rem;
            color: var(--muted-text);
        }

        /* FAQ 折叠面板 */
        .faq-accordion {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .faq-item {
            background: #ffffff;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-question {
            padding: 18px 24px;
            font-weight: 600;
            font-size: 1.05rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: #ffffff;
            user-select: none;
        }

        .faq-question::after {
            content: '+';
            font-size: 1.4rem;
            color: var(--primary);
            transition: var(--transition);
        }

        .faq-item.active .faq-question::after {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out, padding 0.3s ease;
            background: #fafafa;
            color: var(--muted-text);
            font-size: 0.95rem;
            padding: 0 24px;
        }

        .faq-item.active .faq-answer {
            max-height: 200px;
            padding: 16px 24px;
            border-top: 1px solid var(--border-color);
        }

        /* 表单与联系 */
        .contact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: start;
        }

        .contact-form {
            background: #ffffff;
            padding: 36px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-md);
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            font-size: 0.925rem;
            color: var(--dark-text);
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            outline: none;
            transition: var(--transition);
        }

        .form-control:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(255, 85, 0, 0.15);
        }

        textarea.form-control {
            resize: vertical;
            min-height: 110px;
        }

        .contact-info-box {
            background: #ffffff;
            padding: 36px;
            border-radius: var(--radius-md);
            border: 1px solid var(--border-color);
            box-shadow: var(--shadow-sm);
        }

        .info-list {
            list-style: none;
            margin-top: 24px;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .info-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            font-size: 1rem;
        }

        .qr-code-wrapper {
            margin-top: 24px;
            display: flex;
            align-items: center;
            gap: 20px;
            background: var(--primary-light);
            padding: 16px;
            border-radius: var(--radius-sm);
        }

        .qr-code-wrapper img {
            width: 110px;
            height: 110px;
            border-radius: 6px;
            object-fit: cover;
        }

        /* 底部 Footer - Must use dark readable color if light background */
        .site-footer {
            background-color: #1e293b;
            color: #94a3b8;
            padding: 60px 0 30px 0;
            border-top: 1px solid #334155;
        }

        .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: 20px;
        }

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

        .footer-links a {
            color: #cbd5e1;
            font-size: 0.9rem;
        }

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

        .friendly-links-wrap {
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid #334155;
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
            align-items: center;
        }

        .friendly-links-wrap a {
            color: #94a3b8;
            font-size: 0.875rem;
        }

        .friendly-links-wrap a:hover {
            color: #ffffff;
        }

        .copyright-bar {
            text-align: center;
            padding-top: 30px;
            border-top: 1px solid #334155;
            font-size: 0.875rem;
            color: #64748b;
        }

        /* 浮动客服 */
        .floating-kefu {
            position: fixed;
            right: 24px;
            bottom: 30px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .float-btn {
            width: 52px;
            height: 52px;
            background: var(--primary);
            color: #ffffff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 16px rgba(255, 85, 0, 0.4);
            cursor: pointer;
            font-weight: 700;
            font-size: 0.85rem;
            text-align: center;
            transition: var(--transition);
            text-decoration: none;
        }

        .float-btn:hover {
            transform: scale(1.1);
            color: #ffffff;
        }

        /* 响应式调整 */
        @media (max-width: 992px) {
            .hero-h1 { font-size: 2.3rem; }
            .grid-3, .grid-4, .process-steps { grid-template-columns: repeat(2, 1fr); }
            .hero-stats { grid-template-columns: repeat(2, 1fr); }
            .footer-grid { grid-template-columns: repeat(2, 1fr); }
            .contact-grid { grid-template-columns: 1fr; }
        }

        @media (max-width: 768px) {
            .nav-links {
                display: none;
                position: absolute;
                top: 76px;
                left: 0;
                width: 100%;
                background: #ffffff;
                flex-direction: column;
                padding: 20px 0;
                box-shadow: var(--shadow-md);
                border-bottom: 1px solid var(--border-color);
            }
            .nav-links.active { display: flex; }
            .nav-links li { width: 100%; text-align: center; }
            .nav-links li a { padding: 12px; }
            .mobile-toggle { display: block; }
            .grid-2, .grid-3, .grid-4, .process-steps, .hero-stats { grid-template-columns: 1fr; }
            .hero-h1 { font-size: 1.8rem; }
            .footer-grid { grid-template-columns: 1fr; }
        }