:root {
            --primary-neon: #39ff14; /* 荧光绿 */
            --secondary-neon: #06b6d4; /* 荧光蓝 */
            --accent-neon: #d946ef; /* 荧光紫 */
            --bg-main: #f8fafc;
            --bg-card: #ffffff;
            --text-main: #0f172a;
            --text-muted: #475569;
            --border-color: #e2e8f0;
            --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
        }

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

        body {
            font-family: var(--font-sans);
            background-color: var(--bg-main);
            color: var(--text-main);
            line-height: 1.6;
            overflow-x: hidden;
        }

        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* 顶部导航 */
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            z-index: 1000;
            transition: all 0.3s ease;
        }

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

        .logo-area {
            display: flex;
            align-items: center;
            gap: 10px;
        }

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

        .brand-name {
            font-weight: 800;
            font-size: 1.25rem;
            background: linear-gradient(135deg, var(--secondary-neon), var(--accent-neon));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

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

        .nav-menu a {
            text-decoration: none;
            color: var(--text-main);
            font-weight: 500;
            font-size: 0.9rem;
            transition: color 0.3s;
        }

        .nav-menu a:hover {
            color: var(--secondary-neon);
        }

        .nav-btn {
            background: linear-gradient(135deg, var(--secondary-neon), var(--accent-neon));
            color: #fff !important;
            padding: 8px 16px;
            border-radius: 20px;
            font-weight: 600 !important;
            box-shadow: 0 4px 15px rgba(6, 182, 212, 0.2);
            transition: transform 0.3s, box-shadow 0.3s;
        }

        .nav-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
        }

        /* 侧边快捷导航 */
        .side-nav {
            position: fixed;
            right: 20px;
            top: 50%;
            transform: translateY(-50%);
            background: rgba(255, 255, 255, 0.95);
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 15px 10px;
            z-index: 999;
            box-shadow: 0 10px 25px rgba(0,0,0,0.05);
            max-height: 80vh;
            overflow-y: auto;
            display: none;
        }

        @media (min-width: 1200px) {
            .side-nav {
                display: block;
            }
        }

        .side-nav ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 8px;
        }

        .side-nav a {
            text-decoration: none;
            color: var(--text-muted);
            font-size: 0.75rem;
            display: block;
            padding: 4px 8px;
            border-radius: 4px;
            transition: all 0.2s;
        }

        .side-nav a:hover, .side-nav a.active {
            background: linear-gradient(90deg, rgba(6, 182, 212, 0.1), rgba(217, 70, 239, 0.1));
            color: var(--text-main);
            font-weight: bold;
            border-left: 2px solid var(--secondary-neon);
        }

        /* 汉堡菜单 */
        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
            border: none;
            background: transparent;
        }

        .menu-toggle span {
            display: block;
            width: 25px;
            height: 3px;
            background-color: var(--text-main);
            border-radius: 2px;
            transition: 0.3s;
        }

        /* 首屏 Hero - 无图片，炫彩荧光风 */
        .hero-section {
            padding-top: 150px;
            padding-bottom: 80px;
            position: relative;
            background: radial-gradient(circle at 10% 20%, rgba(6, 182, 212, 0.08) 0%, rgba(217, 70, 239, 0.05) 90%), #ffffff;
            border-bottom: 1px solid var(--border-color);
            overflow: hidden;
            text-align: center;
        }

        .hero-section::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(57, 255, 20, 0.03) 0%, transparent 60%);
            pointer-events: none;
            animation: rotateBg 20s linear infinite;
        }

        @keyframes rotateBg {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .hero-badge {
            display: inline-block;
            padding: 6px 16px;
            background: rgba(6, 182, 212, 0.1);
            color: var(--secondary-neon);
            border: 1px solid rgba(6, 182, 212, 0.3);
            border-radius: 30px;
            font-size: 0.85rem;
            font-weight: bold;
            margin-bottom: 24px;
            letter-spacing: 1px;
            animation: pulse 2s infinite;
        }

        @keyframes pulse {
            0% { box-shadow: 0 0 0 0 rgba(6, 182, 212, 0.4); }
            70% { box-shadow: 0 0 0 10px rgba(6, 182, 212, 0); }
            100% { box-shadow: 0 0 0 0 rgba(6, 182, 212, 0); }
        }

        h1.hero-title {
            font-size: clamp(2rem, 5vw, 3.5rem);
            font-weight: 800;
            line-height: 1.2;
            color: var(--text-main);
            max-width: 900px;
            margin: 0 auto 20px;
        }

        .hero-desc {
            font-size: 1.15rem;
            color: var(--text-muted);
            max-width: 700px;
            margin: 0 auto 35px;
        }

        .hero-buttons {
            display: flex;
            justify-content: center;
            gap: 15px;
            flex-wrap: wrap;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 12px 28px;
            border-radius: 30px;
            font-weight: 600;
            text-decoration: none;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--secondary-neon), var(--accent-neon));
            color: #fff;
            box-shadow: 0 10px 25px rgba(6, 182, 212, 0.3);
        }

        .btn-primary:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 35px rgba(6, 182, 212, 0.5);
        }

        .btn-outline {
            border: 2px solid var(--text-main);
            color: var(--text-main);
        }

        .btn-outline:hover {
            background-color: var(--text-main);
            color: #fff;
            transform: translateY(-3px);
        }

        /* 公用Section样式 */
        section {
            padding: 80px 0;
            border-bottom: 1px solid var(--border-color);
        }

        section:nth-child(even) {
            background-color: #ffffff;
        }

        .section-header {
            text-align: center;
            margin-bottom: 50px;
        }

        .section-badge {
            color: var(--accent-neon);
            font-weight: 700;
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 2px;
            margin-bottom: 10px;
            display: block;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 800;
            color: var(--text-main);
            position: relative;
            display: inline-block;
            padding-bottom: 12px;
        }

        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 4px;
            background: linear-gradient(90deg, var(--secondary-neon), var(--accent-neon));
            border-radius: 2px;
        }

        /* 卡片网格 */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }

        .grid-4 {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 25px;
        }

        .card {
            background: var(--bg-card);
            border: 1px solid var(--border-color);
            border-radius: 16px;
            padding: 30px;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(6, 182, 212, 0.1);
            border-color: var(--secondary-neon);
        }

        .card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 4px;
            height: 100%;
            background: linear-gradient(to bottom, var(--secondary-neon), var(--accent-neon));
            opacity: 0;
            transition: opacity 0.3s;
        }

        .card:hover::before {
            opacity: 1;
        }

        .card-icon {
            font-size: 2rem;
            margin-bottom: 20px;
            display: inline-block;
        }

        .card-title {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 12px;
            color: var(--text-main);
        }

        .card-desc {
            color: var(--text-muted);
            font-size: 0.95rem;
        }

        /* 标签云组件 */
        .tag-cloud {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            margin-top: 20px;
        }

        .tag-item {
            background: #f1f5f9;
            color: var(--text-muted);
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.85rem;
            font-weight: 500;
            border: 1px solid #e2e8f0;
            transition: all 0.2s;
        }

        .tag-item:hover {
            background: var(--secondary-neon);
            color: #fff;
            border-color: var(--secondary-neon);
        }

        /* 关于我们 */
        .about-box {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 50px;
            align-items: center;
        }

        @media (max-width: 768px) {
            .about-box {
                grid-template-columns: 1fr;
            }
        }

        .about-text h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 15px;
        }

        .about-text p {
            margin-bottom: 15px;
            color: var(--text-muted);
        }

        /* 数据指标 */
        .stats-bar {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            text-align: center;
            margin-top: 40px;
        }

        @media (max-width: 768px) {
            .stats-bar {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        .stat-item {
            padding: 20px;
        }

        .stat-num {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--secondary-neon);
            margin-bottom: 5px;
        }

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

        /* 流程步骤 & 时间线 */
        .timeline {
            position: relative;
            max-width: 800px;
            margin: 0 auto;
            padding: 20px 0;
        }

        .timeline::after {
            content: '';
            position: absolute;
            width: 2px;
            background: var(--border-color);
            top: 0;
            bottom: 0;
            left: 50%;
            margin-left: -1px;
        }

        .timeline-item {
            padding: 10px 40px;
            position: relative;
            background-color: inherit;
            width: 50%;
        }

        .timeline-item::after {
            content: '';
            position: absolute;
            width: 16px;
            height: 16px;
            right: -8px;
            background-color: #fff;
            border: 4px solid var(--secondary-neon);
            top: 15px;
            border-radius: 50%;
            z-index: 1;
        }

        .left {
            left: 0;
        }

        .right {
            left: 50%;
        }

        .right::after {
            left: -8px;
        }

        .timeline-content {
            padding: 20px;
            background: #fff;
            position: relative;
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }

        @media (max-width: 600px) {
            .timeline::after {
                left: 31px;
            }
            .timeline-item {
                width: 100%;
                padding-left: 70px;
                padding-right: 25px;
            }
            .timeline-item::after {
                left: 23px;
            }
            .right {
                left: 0%;
            }
        }

        /* 对比评测表格 */
        .table-responsive {
            width: 100%;
            overflow-x: auto;
            margin: 30px 0;
            border-radius: 12px;
            border: 1px solid var(--border-color);
        }

        table.comparison-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            background: #fff;
            min-width: 600px;
        }

        table.comparison-table th, table.comparison-table td {
            padding: 15px 20px;
            border-bottom: 1px solid var(--border-color);
        }

        table.comparison-table th {
            background-color: #f1f5f9;
            font-weight: 700;
        }

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

        .highlight-col {
            background: rgba(6, 182, 212, 0.04);
            font-weight: bold;
        }

        .star-rating {
            color: #fbbf24;
            font-size: 1.2rem;
        }

        /* 案例展示 */
        .case-gallery {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
        }

        .case-item {
            position: relative;
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid var(--border-color);
        }

        .case-item img {
            width: 100%;
            height: 240px;
            object-fit: cover;
            display: block;
            transition: transform 0.5s;
        }

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

        .case-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(to top, rgba(0,0,0,0.8), rgba(0,0,0,0));
            padding: 20px;
            color: #fff;
        }

        /* 价格表 & Token 比价 */
        .price-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 25px;
        }

        .price-card {
            border: 1px solid var(--border-color);
            background: #fff;
            border-radius: 16px;
            padding: 40px 30px;
            text-align: center;
            position: relative;
        }

        .price-card.popular {
            border: 2px solid var(--secondary-neon);
            transform: scale(1.05);
            box-shadow: 0 10px 30px rgba(6, 182, 212, 0.15);
        }

        .price-badge {
            position: absolute;
            top: 15px;
            right: 15px;
            background: var(--secondary-neon);
            color: #fff;
            padding: 4px 10px;
            font-size: 0.75rem;
            border-radius: 20px;
            font-weight: 700;
        }

        .price-num {
            font-size: 2rem;
            font-weight: 800;
            margin: 20px 0;
            color: var(--text-main);
        }

        .price-num span {
            font-size: 1rem;
            font-weight: normal;
            color: var(--text-muted);
        }

        /* 表单样式 */
        .form-wrapper {
            max-width: 700px;
            margin: 0 auto;
            background: #fff;
            border: 1px solid var(--border-color);
            padding: 40px;
            border-radius: 16px;
            box-shadow: 0 10px 25px rgba(0,0,0,0.02);
        }

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

        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            font-size: 0.95rem;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            outline: none;
            font-family: inherit;
            transition: border-color 0.3s;
        }

        .form-control:focus {
            border-color: var(--secondary-neon);
        }

        .grid-2-form {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
        }

        @media (max-width: 576px) {
            .grid-2-form {
                grid-template-columns: 1fr;
            }
        }

        /* FAQ折叠面板 */
        .faq-list {
            max-width: 800px;
            margin: 0 auto;
        }

        .faq-item {
            border-bottom: 1px solid var(--border-color);
            padding: 15px 0;
        }

        .faq-question {
            font-weight: 700;
            font-size: 1.1rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            padding: 10px 0;
        }

        .faq-answer {
            color: var(--text-muted);
            padding: 10px 0;
            display: none;
            font-size: 0.95rem;
            line-height: 1.7;
        }

        .faq-icon::after {
            content: '+';
            font-size: 1.5rem;
            color: var(--secondary-neon);
        }

        .faq-item.active .faq-icon::after {
            content: '−';
        }

        /* 评论区 */
        .comments-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
        }

        .comment-card {
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: 12px;
            padding: 25px;
        }

        .comment-user {
            display: flex;
            align-items: center;
            gap: 15px;
            margin-bottom: 15px;
        }

        .avatar-placeholder {
            width: 45px;
            height: 45px;
            background: linear-gradient(135deg, var(--secondary-neon), var(--accent-neon));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            font-weight: bold;
            font-size: 0.9rem;
        }

        .user-info h4 {
            font-size: 1rem;
            font-weight: 700;
        }

        .user-info p {
            font-size: 0.8rem;
            color: var(--text-muted);
        }

        .comment-text {
            font-size: 0.95rem;
            color: var(--text-muted);
            font-style: italic;
        }

        /* 友情链接与页脚 */
        footer {
            background-color: #0f172a;
            color: #94a3b8;
            padding: 60px 0 30px;
            border-top: 1px solid #1e293b;
        }

        footer a {
            color: #cbd5e1;
            text-decoration: none;
            transition: color 0.3s;
        }

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

        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 40px;
            margin-bottom: 40px;
        }

        .footer-col h5 {
            color: #fff;
            font-size: 1rem;
            margin-bottom: 20px;
            position: relative;
        }

        .footer-col h5::after {
            content: '';
            position: absolute;
            bottom: -8px;
            left: 0;
            width: 30px;
            height: 2px;
            background: var(--primary-neon);
        }

        .footer-col ul {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 10px;
            font-size: 0.9rem;
        }

        .friend-links-area {
            border-top: 1px solid #1e293b;
            padding-top: 20px;
            margin-top: 20px;
            font-size: 0.85rem;
        }

        .friend-links-area p {
            margin-bottom: 10px;
            color: #64748b;
        }

        .friend-links-list {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }

        .footer-bottom {
            border-top: 1px solid #1e293b;
            padding-top: 30px;
            text-align: center;
            font-size: 0.85rem;
        }

        /* 浮动客服栏 */
        .floating-service {
            position: fixed;
            bottom: 30px;
            right: 30px;
            display: flex;
            flex-direction: column;
            gap: 10px;
            z-index: 1000;
        }

        .float-item {
            width: 50px;
            height: 50px;
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 10px 25px rgba(0,0,0,0.1);
            cursor: pointer;
            position: relative;
            transition: all 0.3s;
        }

        .float-item:hover {
            background: var(--secondary-neon);
            color: #fff;
        }

        .qr-popover {
            position: absolute;
            bottom: 60px;
            right: 0;
            background: #fff;
            border: 1px solid var(--border-color);
            border-radius: 8px;
            padding: 15px;
            box-shadow: 0 15px 35px rgba(0,0,0,0.15);
            display: none;
            width: 180px;
            text-align: center;
        }

        .qr-popover img {
            width: 100%;
            height: auto;
            border-radius: 4px;
        }

        .qr-popover p {
            font-size: 0.75rem;
            color: var(--text-main);
            margin-top: 8px;
        }

        .float-item:hover .qr-popover {
            display: block;
        }

        /* 移动端菜单响应式 */
        @media (max-width: 992px) {
            .nav-menu {
                position: fixed;
                top: 70px;
                left: -100%;
                width: 100%;
                height: calc(100vh - 70px);
                background: #fff;
                flex-direction: column;
                align-items: center;
                padding-top: 40px;
                transition: left 0.3s ease;
                border-top: 1px solid var(--border-color);
            }

            .nav-menu.active {
                left: 0;
            }

            .menu-toggle {
                display: flex;
            }
        }