:root {
            --primary: #0066ff;
            --primary-light: #e6f0ff;
            --accent: #00f2fe;
            --success: #10b981;
            --dark: #1e293b;
            --text-main: #334155;
            --text-muted: #64748b;
            --bg-light: #f8fafc;
            --bg-white: #ffffff;
            --border-color: #e2e8f0;
            --container-width: 1200px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        * {
            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-light);
            color: var(--text-main);
            line-height: 1.6;
            overflow-x: hidden;
        }

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

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        /* 布局容器 */
        .container {
            width: 100%;
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 24px;
        }

        /* 顶部导航 */
        header {
            background-color: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 100;
        }

        .nav-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
        }

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

        .ai-page-logo {
            max-height: 40px;
            width: auto;
        }

        .brand-name {
            font-size: 20px;
            font-weight: 700;
            color: var(--dark);
            letter-spacing: 0.5px;
        }

        .nav-menu {
            display: flex;
            align-items: center;
            gap: 20px;
            list-style: none;
        }

        .nav-link {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-main);
            padding: 8px 12px;
            border-radius: 6px;
        }

        .nav-link:hover {
            color: var(--primary);
            background-color: var(--primary-light);
        }

        .nav-btn {
            background-color: var(--primary);
            color: #fff;
            padding: 8px 18px;
            border-radius: 30px;
            font-size: 14px;
            font-weight: 600;
            box-shadow: 0 4px 10px rgba(0, 102, 255, 0.2);
        }

        .nav-btn:hover {
            background-color: #0052cc;
            transform: translateY(-2px);
        }

        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 6px;
            cursor: pointer;
            border: none;
            background: none;
        }

        .menu-toggle span {
            display: block;
            width: 24px;
            height: 3px;
            background-color: var(--dark);
            border-radius: 2px;
            transition: var(--transition);
        }

        /* 首屏 Hero - 高亮度鲜活风, 首屏无图 */
        .hero {
            position: relative;
            background: linear-gradient(135deg, #e6f0ff 0%, #f0f7ff 50%, #ffffff 100%);
            padding: 100px 0 80px;
            text-align: center;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -20%;
            left: -10%;
            width: 400px;
            height: 400px;
            background: radial-gradient(circle, rgba(0,242,254,0.15) 0%, rgba(255,255,255,0) 70%);
            z-index: 1;
        }

        .hero::after {
            content: '';
            position: absolute;
            bottom: -10%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0,102,255,0.1) 0%, rgba(255,255,255,0) 70%);
            z-index: 1;
        }

        .hero-content {
            position: relative;
            z-index: 2;
            max-width: 800px;
            margin: 0 auto;
        }

        .badge-premium {
            display: inline-flex;
            align-items: center;
            background: linear-gradient(90deg, var(--primary-light), rgba(0,242,254,0.2));
            color: var(--primary);
            padding: 6px 16px;
            border-radius: 30px;
            font-size: 13px;
            font-weight: 700;
            margin-bottom: 24px;
            border: 1px solid rgba(0, 102, 255, 0.15);
        }

        .hero-title {
            font-size: 42px;
            font-weight: 800;
            color: var(--dark);
            line-height: 1.25;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }

        .hero-title span {
            background: linear-gradient(90deg, var(--primary), var(--accent));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .hero-subtitle {
            font-size: 18px;
            color: var(--text-muted);
            margin-bottom: 36px;
            max-width: 650px;
            margin-left: auto;
            margin-right: auto;
        }

        .hero-btns {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 16px;
            flex-wrap: wrap;
        }

        .btn-main {
            background: linear-gradient(135deg, var(--primary) 0%, #0052cc 100%);
            color: #fff;
            padding: 14px 32px;
            border-radius: 30px;
            font-size: 16px;
            font-weight: 600;
            box-shadow: 0 8px 20px rgba(0, 102, 255, 0.25);
        }

        .btn-main:hover {
            transform: translateY(-2px);
            box-shadow: 0 12px 24px rgba(0, 102, 255, 0.35);
        }

        .btn-sub {
            background-color: var(--bg-white);
            color: var(--primary);
            border: 1px solid var(--border-color);
            padding: 14px 32px;
            border-radius: 30px;
            font-size: 16px;
            font-weight: 600;
        }

        .btn-sub:hover {
            background-color: var(--primary-light);
            border-color: var(--primary);
            transform: translateY(-2px);
        }

        /* 标签与特性说明 */
        .hero-tags {
            margin-top: 48px;
            display: flex;
            justify-content: center;
            gap: 24px;
            flex-wrap: wrap;
        }

        .hero-tag-item {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 14px;
            color: var(--text-main);
            font-weight: 500;
        }

        .hero-tag-item svg {
            color: var(--success);
            flex-shrink: 0;
        }

        /* 数据指标卡片 */
        .stats-section {
            background-color: var(--bg-white);
            padding: 50px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .stats-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
        }

        .stat-card {
            text-align: center;
            padding: 20px;
            border-right: 1px solid var(--border-color);
        }

        .stat-card:last-child {
            border-right: none;
        }

        .stat-num {
            font-size: 36px;
            font-weight: 800;
            color: var(--primary);
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .stat-label {
            font-size: 14px;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* 通用 Section 样式 */
        .section {
            padding: 90px 0;
        }

        .section-light {
            background-color: var(--bg-light);
        }

        .section-white {
            background-color: var(--bg-white);
        }

        .section-header {
            text-align: center;
            max-width: 700px;
            margin: 0 auto 60px;
        }

        .section-title {
            font-size: 32px;
            font-weight: 800;
            color: var(--dark);
            margin-bottom: 16px;
        }

        .section-desc {
            font-size: 16px;
            color: var(--text-muted);
        }

        /* 平台介绍 & 关于我们 */
        .about-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 60px;
            align-items: center;
        }

        .about-text h3 {
            font-size: 24px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 20px;
        }

        .about-p {
            font-size: 15px;
            color: var(--text-main);
            margin-bottom: 20px;
            text-align: justify;
        }

        .about-features {
            list-style: none;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 16px;
            margin-top: 30px;
        }

        .about-feat-item {
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 14px;
            font-weight: 600;
            color: var(--dark);
        }

        .about-feat-item svg {
            color: var(--primary);
        }

        .about-img-box {
            position: relative;
            background: linear-gradient(135deg, var(--primary-light) 0%, rgba(0, 242, 254, 0.1) 100%);
            border-radius: 20px;
            padding: 24px;
            border: 1px dashed var(--primary);
        }

        .about-img-box img {
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.05);
            width: 100%;
        }

        /* 服务能力 / AIGC 制作场景 */
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 30px;
        }

        .service-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 30px;
            transition: var(--transition);
            display: flex;
            flex-direction: column;
            height: 100%;
        }

        .service-card:hover {
            transform: translateY(-8px);
            box-shadow: 0 12px 30px rgba(0, 102, 255, 0.08);
            border-color: rgba(0, 102, 255, 0.3);
        }

        .card-icon {
            width: 54px;
            height: 54px;
            background-color: var(--primary-light);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            margin-bottom: 24px;
        }

        .service-card h3 {
            font-size: 19px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 12px;
        }

        .service-card p {
            font-size: 14px;
            color: var(--text-muted);
            flex-grow: 1;
            margin-bottom: 16px;
        }

        .card-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }

        .card-tag {
            font-size: 12px;
            background-color: var(--bg-light);
            color: var(--text-main);
            padding: 2px 8px;
            border-radius: 4px;
            font-weight: 500;
        }

        /* 标签云 - AI 平台列表 */
        .tag-cloud-wrap {
            background: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 40px;
            text-align: center;
        }

        .tag-cloud-title {
            font-size: 20px;
            font-weight: 700;
            margin-bottom: 24px;
            color: var(--dark);
        }

        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 12px;
        }

        .cloud-item {
            font-size: 14px;
            font-weight: 500;
            color: var(--text-main);
            background-color: var(--bg-light);
            border: 1px solid var(--border-color);
            padding: 8px 18px;
            border-radius: 30px;
            transition: var(--transition);
        }

        .cloud-item:hover {
            background-color: var(--primary);
            color: #fff;
            border-color: var(--primary);
            transform: scale(1.05);
        }

        /* 步骤流程 */
        .steps-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 24px;
            position: relative;
        }

        .step-item {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 24px;
            position: relative;
            text-align: center;
        }

        .step-num {
            position: absolute;
            top: -15px;
            left: 50%;
            transform: translateX(-50%);
            width: 32px;
            height: 32px;
            background-color: var(--primary);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 700;
            font-size: 14px;
        }

        .step-item h4 {
            margin-top: 10px;
            font-size: 17px;
            color: var(--dark);
            margin-bottom: 8px;
        }

        .step-item p {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 评测对比与 Token 比价 */
        .comparison-table-wrap {
            width: 100%;
            overflow-x: auto;
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            box-shadow: 0 4px 20px rgba(0,0,0,0.02);
        }

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

        .comparison-table th, .comparison-table td {
            padding: 18px 24px;
            border-bottom: 1px solid var(--border-color);
            font-size: 14px;
        }

        .comparison-table th {
            background-color: var(--bg-light);
            font-weight: 700;
            color: var(--dark);
        }

        .comparison-table tr:last-child td {
            border-bottom: none;
        }

        .highlight-cell {
            background-color: var(--primary-light);
            color: var(--primary);
            font-weight: 700;
        }

        .badge-star {
            background-color: #ff9f43;
            color: #fff;
            padding: 2px 8px;
            border-radius: 4px;
            font-size: 12px;
            font-weight: 600;
        }

        /* 案例中心 & 行业资讯 */
        .case-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .case-card {
            background-color: var(--bg-white);
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }

        .case-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0,0,0,0.05);
        }

        .case-img {
            position: relative;
            aspect-ratio: 16/10;
            overflow: hidden;
            background-color: #eee;
        }

        .case-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
        }

        .case-content {
            padding: 24px;
        }

        .case-meta {
            font-size: 12px;
            color: var(--primary);
            font-weight: 600;
            margin-bottom: 8px;
            text-transform: uppercase;
        }

        .case-title {
            font-size: 17px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 10px;
        }

        .case-desc {
            font-size: 13px;
            color: var(--text-muted);
            margin-bottom: 16px;
        }

        .case-btn {
            font-size: 13px;
            font-weight: 600;
            color: var(--primary);
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        /* 文章列表样式 */
        .article-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .article-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 16px 20px;
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            transition: var(--transition);
        }

        .article-item:hover {
            border-color: var(--primary);
            background-color: var(--primary-light);
        }

        .article-title {
            font-size: 15px;
            font-weight: 600;
            color: var(--dark);
        }

        .article-date {
            font-size: 13px;
            color: var(--text-muted);
        }

        /* 客户评论 */
        .review-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }

        .review-card {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 24px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .review-content {
            font-size: 14px;
            color: var(--text-main);
            margin-bottom: 20px;
            font-style: italic;
        }

        .review-user {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .user-avatar {
            width: 44px;
            height: 44px;
            border-radius: 50%;
            background-color: var(--primary-light);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--primary);
            font-weight: 700;
            font-size: 16px;
        }

        .user-info h5 {
            font-size: 14px;
            font-weight: 700;
            color: var(--dark);
        }

        .user-info p {
            font-size: 12px;
            color: var(--text-muted);
        }

        /* 需求匹配表单与联系我们 */
        .contact-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr;
            gap: 40px;
        }

        .form-wrap {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 40px;
        }

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

        .form-label {
            display: block;
            font-size: 14px;
            font-weight: 600;
            color: var(--dark);
            margin-bottom: 8px;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            font-size: 14px;
            background-color: var(--bg-light);
            transition: var(--transition);
        }

        .form-control:focus {
            outline: none;
            border-color: var(--primary);
            background-color: var(--bg-white);
            box-shadow: 0 0 0 3px rgba(0, 102, 255, 0.1);
        }

        .form-submit-btn {
            width: 100%;
            background: linear-gradient(135deg, var(--primary) 0%, #0052cc 100%);
            color: #fff;
            border: none;
            padding: 14px;
            border-radius: 8px;
            font-size: 15px;
            font-weight: 600;
            cursor: pointer;
            box-shadow: 0 4px 12px rgba(0, 102, 255, 0.2);
            transition: var(--transition);
        }

        .form-submit-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 16px rgba(0, 102, 255, 0.3);
        }

        .info-wrap {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 40px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }

        .contact-info-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 20px;
        }

        .contact-info-item {
            display: flex;
            align-items: flex-start;
            gap: 14px;
        }

        .info-icon {
            color: var(--primary);
            flex-shrink: 0;
            margin-top: 2px;
        }

        .info-content h5 {
            font-size: 15px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 4px;
        }

        .info-content p {
            font-size: 13px;
            color: var(--text-muted);
        }

        .qr-codes {
            display: flex;
            gap: 24px;
            margin-top: 30px;
        }

        .qr-item {
            text-align: center;
        }

        .qr-item img {
            width: 100px;
            height: 100px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            margin-bottom: 8px;
        }

        .qr-item span {
            font-size: 12px;
            color: var(--text-muted);
            font-weight: 500;
        }

        /* 帮助中心 & FAQ */
        .faq-wrap {
            display: flex;
            flex-direction: column;
            gap: 16px;
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 8px;
            overflow: hidden;
            transition: var(--transition);
        }

        .faq-header {
            padding: 18px 24px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            user-select: none;
        }

        .faq-question {
            font-size: 15px;
            font-weight: 700;
            color: var(--dark);
        }

        .faq-icon {
            font-size: 18px;
            color: var(--text-muted);
            transition: var(--transition);
        }

        .faq-answer {
            padding: 0 24px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease-out;
            border-top: 0 solid var(--border-color);
        }

        .faq-answer p {
            padding: 16px 0;
            font-size: 14px;
            color: var(--text-main);
            line-height: 1.6;
        }

        .faq-item.active {
            border-color: var(--primary);
        }

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

        .faq-item.active .faq-answer {
            border-top-width: 1px;
            max-height: 200px; /* 足够容纳文本的高度 */
        }

        /* 友情链接与页脚 */
        footer {
            background-color: var(--dark);
            color: #cbd5e1;
            padding: 60px 0 30px;
            font-size: 14px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr;
            gap: 40px;
            border-bottom: 1px solid #334155;
            padding-bottom: 40px;
            margin-bottom: 30px;
        }

        .footer-brand h4 {
            font-size: 18px;
            color: #fff;
            margin-bottom: 16px;
        }

        .footer-brand p {
            font-size: 13px;
            line-height: 1.6;
            margin-bottom: 20px;
        }

        .footer-links h4 {
            font-size: 15px;
            color: #fff;
            margin-bottom: 16px;
        }

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

        .footer-links a {
            color: #94a3b8;
        }

        .footer-links a:hover {
            color: #fff;
        }

        .friend-links-wrap {
            background-color: #1e293b;
            border: 1px solid #334155;
            border-radius: 8px;
            padding: 16px 20px;
            margin-bottom: 30px;
        }

        .friend-links-title {
            font-size: 13px;
            font-weight: 700;
            color: #94a3b8;
            margin-bottom: 10px;
        }

        .friend-links {
            display: flex;
            flex-wrap: wrap;
            gap: 14px;
        }

        .friend-links a {
            color: #cbd5e1;
            font-size: 13px;
        }

        .friend-links a:hover {
            color: var(--accent);
        }

        .footer-bottom {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 16px;
            font-size: 12px;
            color: #64748b;
        }

        /* 侧边悬浮浮窗 */
        .sticky-toolbar {
            position: fixed;
            right: 24px;
            bottom: 40px;
            display: flex;
            flex-direction: column;
            gap: 12px;
            z-index: 99;
        }

        .toolbar-btn {
            width: 48px;
            height: 48px;
            background-color: var(--bg-white);
            border: 1px solid var(--border-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--text-main);
            box-shadow: 0 4px 12px rgba(0,0,0,0.08);
            cursor: pointer;
            position: relative;
            transition: var(--transition);
        }

        .toolbar-btn:hover {
            background-color: var(--primary);
            color: #fff;
            border-color: var(--primary);
            transform: scale(1.05);
        }

        .toolbar-btn .tooltip {
            position: absolute;
            right: 60px;
            background-color: var(--dark);
            color: #fff;
            padding: 8px 12px;
            border-radius: 6px;
            font-size: 12px;
            font-weight: 500;
            white-space: nowrap;
            opacity: 0;
            pointer-events: none;
            transform: translateX(10px);
            transition: var(--transition);
        }

        .toolbar-btn:hover .tooltip {
            opacity: 1;
            transform: translateX(0);
        }

        /* 移动端响应式适配 */
        @media (max-width: 1024px) {
            .stats-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .stats-card {
                border-right: none;
                border-bottom: 1px solid var(--border-color);
            }
            .stats-card:nth-child(even) {
                border-left: 1px solid var(--border-color);
            }
            .stats-card:nth-last-child(-n+2) {
                border-bottom: none;
            }
            .case-grid, .review-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .steps-container {
                grid-template-columns: repeat(2, 1fr);
                gap: 30px;
            }
        }

        @media (max-width: 768px) {
            .hero-title {
                font-size: 32px;
            }
            .hero-subtitle {
                font-size: 15px;
            }
            .about-grid, .contact-grid {
                grid-template-columns: 1fr;
                gap: 30px;
            }
            .nav-menu {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background-color: var(--bg-white);
                flex-direction: column;
                padding: 20px;
                border-bottom: 1px solid var(--border-color);
                box-shadow: 0 10px 15px rgba(0,0,0,0.05);
            }
            .nav-menu.active {
                display: flex;
            }
            .menu-toggle {
                display: flex;
            }
            .case-grid, .review-grid, .footer-grid {
                grid-template-columns: 1fr;
            }
            .steps-container {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                gap: 20px;
            }
        }