/* 暗夜赛博高饱和粉紫风 核心主题参数 */
        :root {
            --bg-dark: #0b0914;
            --bg-card: rgba(23, 16, 42, 0.75);
            --bg-card-hover: rgba(35, 23, 66, 0.85);
            --primary-pink: #ff2a85;
            --primary-purple: #9d4edd;
            --neon-cyan: #00f0ff;
            --text-main: #f0f3f9;
            --text-sub: #a3a1b8;
            --border-glow: rgba(255, 42, 133, 0.3);
            --border-glow-active: rgba(0, 240, 255, 0.6);
            --container-max: 1200px;
            --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
        }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            background-color: var(--bg-dark);
            color: var(--text-main);
            line-height: 1.6;
            overflow-x: hidden;
            background-image: 
                radial-gradient(circle at 15% 20%, rgba(255, 42, 133, 0.12) 0%, transparent 45%),
                radial-gradient(circle at 85% 60%, rgba(157, 78, 221, 0.15) 0%, transparent 50%),
                radial-gradient(circle at 50% 90%, rgba(0, 240, 255, 0.08) 0%, transparent 40%);
            background-attachment: fixed;
        }

        a {
            color: var(--primary-pink);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--neon-cyan);
            text-shadow: 0 0 8px rgba(0, 240, 255, 0.6);
        }

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

        /* Header & 顶部导航 */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            z-index: 1000;
            background: rgba(11, 9, 20, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid var(--border-glow);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 70px;
        }
        .brand-logo {
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .ai-page-logo {
            max-height: 40px;
            width: auto;
        }

        /* 严格限制: nav-links gap 必须为 0 */
        .nav-links {
            display: flex;
            gap: 0;
            align-items: center;
            list-style: none;
        }
        .nav-links li a {
            color: var(--text-main);
            padding: 8px 14px;
            font-size: 0.95rem;
            font-weight: 500;
            display: inline-block;
        }
        .nav-links li a:hover {
            color: var(--primary-pink);
            background: rgba(255, 42, 133, 0.1);
            border-radius: 4px;
        }

        .mobile-nav-toggle {
            display: none;
            background: none;
            border: 1px solid var(--primary-pink);
            color: var(--primary-pink);
            padding: 6px 12px;
            border-radius: 4px;
            cursor: pointer;
        }

        /* Hero 首屏 - 严格限制: 绝对禁止出现任何图片 */
        .hero-section {
            padding: 160px 0 90px 0;
            position: relative;
            text-align: center;
            background: radial-gradient(ellipse at top, rgba(157, 78, 221, 0.25) 0%, rgba(11, 9, 20, 0) 70%);
        }
        .hero-title {
            font-size: 2.4rem;
            font-weight: 800;
            background: linear-gradient(135deg, #ffffff 0%, var(--primary-pink) 50%, var(--neon-cyan) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: 20px;
            letter-spacing: -0.5px;
        }
        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--text-sub);
            max-width: 800px;
            margin: 0 auto 35px auto;
        }
        .hero-btns {
            display: flex;
            gap: 20px;
            justify-content: center;
            align-items: center;
            flex-wrap: wrap;
            margin-bottom: 50px;
        }
        .btn-primary {
            background: linear-gradient(90deg, var(--primary-pink), var(--primary-purple));
            color: #fff !important;
            padding: 14px 36px;
            border-radius: 30px;
            font-weight: 600;
            box-shadow: 0 0 20px rgba(255, 42, 133, 0.4);
            border: none;
            cursor: pointer;
            display: inline-block;
        }
        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 30px rgba(255, 42, 133, 0.7);
        }
        .btn-secondary {
            border: 1px solid var(--neon-cyan);
            color: var(--neon-cyan) !important;
            padding: 13px 32px;
            border-radius: 30px;
            font-weight: 600;
            background: rgba(0, 240, 255, 0.05);
            display: inline-block;
        }
        .btn-secondary:hover {
            background: rgba(0, 240, 255, 0.2);
            transform: translateY(-2px);
        }

        .hero-stats {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            margin-top: 30px;
        }
        .stat-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            padding: 24px;
            border-radius: 12px;
            backdrop-filter: blur(10px);
        }
        .stat-card h3 {
            font-size: 2rem;
            color: var(--neon-cyan);
            margin-bottom: 5px;
        }
        .stat-card p {
            font-size: 0.9rem;
            color: var(--text-sub);
        }

        /* 通用 Section 框架 */
        .section-block {
            padding: 90px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }
        .section-header {
            text-align: center;
            margin-bottom: 60px;
        }
        .section-tag {
            display: inline-block;
            padding: 4px 14px;
            background: rgba(255, 42, 133, 0.15);
            border: 1px solid var(--primary-pink);
            border-radius: 20px;
            color: var(--primary-pink);
            font-size: 0.85rem;
            margin-bottom: 12px;
            text-transform: uppercase;
            letter-spacing: 1px;
        }
        .section-title {
            font-size: 2rem;
            font-weight: 700;
            color: var(--text-main);
        }
        .section-desc {
            color: var(--text-sub);
            margin-top: 10px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }

        /* 网格卡片布局 */
        .grid-3 {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 25px;
        }
        .grid-4 {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
        }
        .grid-2 {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 30px;
        }

        .cyber-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            border-radius: 12px;
            padding: 30px;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        .cyber-card:hover {
            transform: translateY(-5px);
            border-color: var(--border-glow-active);
            box-shadow: 0 10px 30px rgba(0, 240, 255, 0.15);
            background: var(--bg-card-hover);
        }
        .card-icon {
            font-size: 2rem;
            color: var(--primary-pink);
            margin-bottom: 15px;
        }
        .cyber-card h3 {
            font-size: 1.25rem;
            margin-bottom: 12px;
            color: #fff;
        }
        .cyber-card p {
            color: var(--text-sub);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        /* 标签云模型列表 */
        .model-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
        }
        .tag-item {
            background: rgba(157, 78, 221, 0.15);
            border: 1px solid rgba(157, 78, 221, 0.4);
            color: #d8b4fe;
            padding: 6px 14px;
            border-radius: 6px;
            font-size: 0.85rem;
        }

        /* 对比评测表格 */
        .eval-box {
            background: var(--bg-card);
            border: 1px solid var(--primary-pink);
            border-radius: 16px;
            padding: 40px;
            box-shadow: 0 0 40px rgba(255, 42, 133, 0.15);
        }
        .eval-score-bar {
            display: flex;
            justify-content: space-around;
            align-items: center;
            padding-bottom: 30px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            margin-bottom: 30px;
            text-align: center;
        }
        .score-number {
            font-size: 3.5rem;
            font-weight: 900;
            color: var(--neon-cyan);
            line-height: 1;
        }
        .score-stars {
            color: #ffd700;
            font-size: 1.8rem;
            margin-top: 5px;
        }

        .compare-table-wrapper {
            overflow-x: auto;
        }
        .compare-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
        }
        .compare-table th, .compare-table td {
            padding: 16px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }
        .compare-table th {
            background: rgba(255, 42, 133, 0.1);
            color: var(--primary-pink);
            font-size: 1.05rem;
        }
        .compare-table tr:hover {
            background: rgba(255, 255, 255, 0.03);
        }

        /* 流程步骤 Timeline */
        .timeline-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }
        .step-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            padding: 25px;
            border-radius: 12px;
            position: relative;
        }
        .step-num {
            position: absolute;
            top: -15px;
            right: 15px;
            font-size: 2.5rem;
            font-weight: 900;
            color: rgba(255, 42, 133, 0.2);
        }

        /* FAQ 折叠面板 */
        .faq-list {
            max-width: 900px;
            margin: 0 auto;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            border-radius: 8px;
            overflow: hidden;
        }
        .faq-question {
            padding: 20px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            color: #fff;
        }
        .faq-answer {
            padding: 0 20px 20px 20px;
            color: var(--text-sub);
            font-size: 0.95rem;
            display: none;
            border-top: 1px dashed rgba(255, 255, 255, 0.1);
            margin-top: 5px;
            padding-top: 15px;
        }
        .faq-item.active .faq-answer {
            display: block;
        }
        .faq-item.active .faq-question {
            color: var(--neon-cyan);
        }

        /* 评论卡片 */
        .review-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            padding: 25px;
            border-radius: 12px;
            display: flex;
            flex-direction: column;
            justify-content: space-between;
        }
        .review-user {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 20px;
        }
        .user-avatar {
            width: 45px;
            height: 45px;
            border-radius: 50%;
            background: linear-gradient(45deg, var(--primary-pink), var(--neon-cyan));
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: #fff;
        }

        /* 表单样式 */
        .contact-form-box {
            background: var(--bg-card);
            border: 1px solid var(--border-glow-active);
            border-radius: 16px;
            padding: 40px;
            box-shadow: 0 0 30px rgba(0, 240, 255, 0.1);
        }
        .form-group {
            margin-bottom: 20px;
        }
        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: var(--text-main);
            font-weight: 500;
        }
        .form-control {
            width: 100%;
            padding: 12px 16px;
            background: rgba(11, 9, 20, 0.8);
            border: 1px solid rgba(255, 255, 255, 0.15);
            border-radius: 6px;
            color: #fff;
            font-size: 1rem;
            outline: none;
            transition: var(--transition);
        }
        .form-control:focus {
            border-color: var(--neon-cyan);
            box-shadow: 0 0 8px rgba(0, 240, 255, 0.4);
        }
        textarea.form-control {
            min-height: 120px;
            resize: vertical;
        }

        /* 浮动客服 */
        .floating-kefu {
            position: fixed;
            right: 25px;
            bottom: 25px;
            z-index: 999;
            background: var(--bg-card);
            border: 1px solid var(--primary-pink);
            border-radius: 12px;
            padding: 12px;
            text-align: center;
            box-shadow: 0 0 20px rgba(255, 42, 133, 0.4);
        }
        .floating-kefu img {
            width: 100px;
            height: 100px;
            border-radius: 6px;
            display: block;
            margin-bottom: 6px;
        }

        /* 页脚规范 */
        .site-footer {
            background: #06040a;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            padding: 60px 0 30px 0;
            color: var(--text-sub);
            font-size: 0.9rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 40px;
        }
        .footer-col h4 {
            color: #fff;
            margin-bottom: 20px;
            font-size: 1.1rem;
        }
        .footer-links {
            list-style: none;
        }
        .footer-links li {
            margin-bottom: 10px;
        }
        .friendship-links {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px dashed rgba(255, 255, 255, 0.1);
        }

        /* 响应式调整 */
        @media (max-width: 992px) {
            .grid-3, .grid-4, .timeline-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .hero-stats {
                grid-template-columns: repeat(2, 1fr);
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            .mobile-nav-toggle {
                display: block;
            }
            .nav-links {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: rgba(11, 9, 20, 0.98);
                flex-direction: column;
                padding: 20px 0;
                border-bottom: 1px solid var(--border-glow);
            }
            .nav-links.active {
                display: flex;
            }
            .hero-title {
                font-size: 1.8rem;
            }
            .grid-2, .grid-3, .grid-4, .timeline-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }