:root {
            --bg-main: #0a0712;
            --bg-card: rgba(22, 16, 38, 0.7);
            --bg-card-hover: rgba(35, 25, 60, 0.85);
            --pink-main: #ff007f;
            --pink-glow: rgba(255, 0, 127, 0.4);
            --purple-main: #8a2be2;
            --purple-glow: rgba(138, 43, 226, 0.4);
            --cyan-accent: #00f2fe;
            --text-title: #ffffff;
            --text-body: #cbd5e1;
            --text-muted: #94a3b8;
            --border-glow: rgba(255, 0, 127, 0.25);
            --container-width: 1200px;
        }

        * {
            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;
            background-color: var(--bg-main);
            color: var(--text-body);
            line-height: 1.6;
        }

        body {
            overflow-x: hidden;
            background: radial-gradient(circle at 50% 0%, #1f0a33 0%, #0a0712 70%);
            min-height: 100vh;
        }

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

        /* 导航规则 */
        header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(10, 7, 18, 0.85);
            backdrop-filter: blur(12px);
            border-bottom: 1px solid rgba(255, 0, 127, 0.2);
        }

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

        .brand-area {
            display: flex;
            align-items: center;
            gap: 15px;
        }

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

        .nav-links {
            display: flex;
            align-items: center;
            gap: 0; /* 严格满足规定 */
            list-style: none;
        }

        .nav-links li a {
            color: var(--text-body);
            text-decoration: none;
            padding: 8px 14px;
            font-size: 0.95rem;
            transition: all 0.3s ease;
            display: inline-block;
        }

        .nav-links li a:hover, .nav-links li a.active {
            color: var(--pink-main);
            text-shadow: 0 0 8px var(--pink-glow);
        }

        .cta-btn {
            background: linear-gradient(135deg, var(--pink-main), var(--purple-main));
            color: #fff !important;
            padding: 10px 22px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 600;
            font-size: 0.9rem;
            box-shadow: 0 0 15px var(--pink-glow);
            transition: transform 0.3s, box-shadow 0.3s;
            display: inline-block;
            border: none;
            cursor: pointer;
        }

        .cta-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 0 25px var(--pink-main);
        }

        /* 移动端菜单开关 */
        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            cursor: pointer;
        }

        .menu-toggle span {
            width: 25px;
            height: 3px;
            background-color: var(--pink-main);
            border-radius: 2px;
        }

        /* 首屏 Hero - 严格禁止出现图片 */
        .hero-section {
            padding: 90px 0 60px;
            text-align: center;
            position: relative;
        }

        .hero-badge {
            display: inline-block;
            padding: 6px 18px;
            border-radius: 20px;
            background: rgba(255, 0, 127, 0.15);
            border: 1px solid var(--pink-main);
            color: var(--pink-main);
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 20px;
            letter-spacing: 1px;
        }

        .hero-title {
            font-size: 2.6rem;
            color: var(--text-title);
            margin-bottom: 20px;
            font-weight: 800;
            background: linear-gradient(135deg, #fff 30%, var(--pink-main) 70%, var(--cyan-accent) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            line-height: 1.2;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--text-muted);
            max-width: 800px;
            margin: 0 auto 35px;
        }

        .hero-actions {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 50px;
            flex-wrap: wrap;
        }

        .hero-actions .btn-secondary {
            border: 1px solid var(--purple-main);
            background: rgba(138, 43, 226, 0.15);
            color: #fff;
            padding: 10px 24px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
        }

        .hero-actions .btn-secondary:hover {
            background: var(--purple-main);
            box-shadow: 0 0 15px var(--purple-glow);
        }

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

        .stat-card {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            padding: 25px 15px;
            border-radius: 12px;
            backdrop-filter: blur(8px);
            transition: transform 0.3s, border-color 0.3s;
        }

        .stat-card:hover {
            transform: translateY(-5px);
            border-color: var(--pink-main);
        }

        .stat-number {
            font-size: 2rem;
            font-weight: 700;
            color: var(--cyan-accent);
            margin-bottom: 5px;
        }

        .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* 通用 Section 样式 */
        section {
            padding: 70px 0;
            border-bottom: 1px solid rgba(255, 255, 255, 0.05);
        }

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

        .section-tag {
            color: var(--pink-main);
            font-size: 0.9rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 2px;
            display: block;
            margin-bottom: 8px;
        }

        .section-title {
            font-size: 2rem;
            color: var(--text-title);
            font-weight: 700;
        }

        .section-desc {
            color: var(--text-muted);
            margin-top: 10px;
            font-size: 1rem;
        }

        /* 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: 25px;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }

        .cyber-card:hover {
            background: var(--bg-card-hover);
            border-color: var(--pink-main);
            box-shadow: 0 0 20px rgba(255, 0, 127, 0.15);
            transform: translateY(-4px);
        }

        .cyber-card h3 {
            color: var(--text-title);
            font-size: 1.25rem;
            margin-bottom: 12px;
        }

        .cyber-card p {
            color: var(--text-muted);
            font-size: 0.92rem;
            line-height: 1.6;
        }

        .card-tag {
            display: inline-block;
            background: rgba(138, 43, 226, 0.2);
            color: var(--cyan-accent);
            font-size: 0.75rem;
            padding: 3px 10px;
            border-radius: 4px;
            margin-bottom: 12px;
        }

        /* 标签云模型列表 */
        .model-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-top: 20px;
        }

        .model-tag {
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid rgba(255, 0, 127, 0.3);
            color: #fff;
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.85rem;
            transition: all 0.3s;
        }

        .model-tag:hover {
            background: var(--pink-main);
            box-shadow: 0 0 10px var(--pink-main);
        }

        /* 对比表格 */
        .table-responsive {
            overflow-x: auto;
            border-radius: 12px;
            border: 1px solid var(--border-glow);
        }

        .cyber-table {
            width: 100%;
            border-collapse: collapse;
            text-align: left;
            background: var(--bg-card);
        }

        .cyber-table th, .cyber-table td {
            padding: 16px 20px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
        }

        .cyber-table th {
            background: rgba(138, 43, 226, 0.2);
            color: var(--text-title);
            font-size: 1rem;
        }

        .cyber-table td {
            color: var(--text-body);
            font-size: 0.95rem;
        }

        .highlight-cell {
            color: var(--pink-main);
            font-weight: bold;
            background: rgba(255, 0, 127, 0.05);
        }

        /* 评分横幅 */
        .rating-box {
            background: linear-gradient(90deg, rgba(255,0,127,0.15), rgba(138,43,226,0.15));
            border: 1px solid var(--pink-main);
            border-radius: 12px;
            padding: 20px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 25px;
            flex-wrap: wrap;
            gap: 15px;
        }

        .rating-score {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--pink-main);
        }

        .rating-stars {
            color: #ffd700;
            font-size: 1.3rem;
        }

        /* 流程步骤 */
        .step-timeline {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 20px;
            position: relative;
        }

        .step-item {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            border-radius: 12px;
            padding: 25px;
            text-align: center;
        }

        .step-num {
            width: 40px;
            height: 40px;
            background: var(--pink-main);
            color: #fff;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            margin: 0 auto 15px;
            box-shadow: 0 0 10px var(--pink-main);
        }

        /* 图文案例 Showcase */
        .case-img-wrap {
            border-radius: 8px;
            overflow: hidden;
            margin-bottom: 15px;
            border: 1px solid rgba(255, 255, 255, 0.1);
        }

        .ai-page-image {
            width: 100%;
            height: auto;
            display: block;
            transition: transform 0.3s;
        }

        .cyber-card:hover .ai-page-image {
            transform: scale(1.03);
        }

        /* 折叠面板 FAQ */
        .faq-accordion {
            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-header {
            padding: 18px 20px;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            font-weight: 600;
            color: var(--text-title);
            user-select: none;
        }

        .faq-header:hover {
            color: var(--pink-main);
        }

        .faq-icon {
            transition: transform 0.3s;
        }

        .faq-body {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
            padding: 0 20px;
            color: var(--text-muted);
            font-size: 0.93rem;
            border-top: 1px solid transparent;
        }

        .faq-item.active .faq-body {
            max-height: 300px;
            padding: 15px 20px 20px;
            border-top-color: rgba(255, 255, 255, 0.05);
        }

        .faq-item.active .faq-icon {
            transform: rotate(180deg);
            color: var(--pink-main);
        }

        /* 评论卡片 */
        .review-author {
            display: flex;
            align-items: center;
            gap: 12px;
            margin-top: 15px;
            padding-top: 15px;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }

        .avatar-fake {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--purple-main), var(--pink-main));
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: #fff;
        }

        .author-info h4 {
            font-size: 0.95rem;
            color: var(--text-title);
        }

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

        /* 表单区域 */
        .form-container {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            border-radius: 16px;
            padding: 35px;
            box-shadow: 0 0 30px rgba(0, 0, 0, 0.5);
        }

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

        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: var(--text-title);
            font-size: 0.9rem;
        }

        .form-control {
            width: 100%;
            padding: 12px 16px;
            background: rgba(10, 7, 18, 0.8);
            border: 1px solid rgba(255, 0, 127, 0.3);
            border-radius: 8px;
            color: #fff;
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.3s;
        }

        .form-control:focus {
            border-color: var(--pink-main);
            box-shadow: 0 0 10px var(--pink-glow);
        }

        select.form-control option {
            background-color: #161026;
            color: #fff;
        }

        /* 底部与页脚 */
        footer {
            background: #050308;
            border-top: 1px solid rgba(255, 0, 127, 0.2);
            padding: 50px 0 30px;
            font-size: 0.88rem;
            color: var(--text-muted);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr 1.5fr;
            gap: 30px;
            margin-bottom: 40px;
        }

        .footer-col h4 {
            color: var(--text-title);
            margin-bottom: 18px;
            font-size: 1.05rem;
        }

        .footer-links {
            list-style: none;
        }

        .footer-links li {
            margin-bottom: 10px;
        }

        .footer-links a {
            color: var(--text-muted);
            text-decoration: none;
            transition: color 0.3s;
        }

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

        .friendship-links {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-top: 10px;
        }

        .friendship-links a {
            color: var(--text-muted);
            text-decoration: none;
            font-size: 0.85rem;
            background: rgba(255, 255, 255, 0.03);
            padding: 4px 10px;
            border-radius: 4px;
            border: 1px solid rgba(255, 255, 255, 0.05);
        }

        .friendship-links a:hover {
            color: var(--cyan-accent);
            border-color: var(--cyan-accent);
        }

        .footer-bottom {
            text-align: center;
            padding-top: 25px;
            border-top: 1px solid rgba(255, 255, 255, 0.05);
        }

        /* 浮动客服入口 */
        .floating-contact {
            position: fixed;
            right: 25px;
            bottom: 25px;
            z-index: 999;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }

        .float-btn {
            width: 50px;
            height: 50px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--pink-main), var(--purple-main));
            display: flex;
            align-items: center;
            justify-content: center;
            color: #fff;
            text-decoration: none;
            box-shadow: 0 0 15px var(--pink-glow);
            font-size: 0.8rem;
            text-align: center;
            font-weight: bold;
            transition: transform 0.3s;
        }

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

        /* 响应式适配 */
        @media (max-width: 992px) {
            .grid-4, .grid-3, .hero-stats, .step-timeline, .footer-grid {
                grid-template-columns: repeat(2, 1fr);
            }
        }

        @media (max-width: 768px) {
            .menu-toggle {
                display: flex;
            }

            .nav-links {
                display: none;
                position: absolute;
                top: 70px;
                left: 0;
                width: 100%;
                background: #0d0714;
                flex-direction: column;
                padding: 20px 0;
                border-bottom: 1px solid var(--pink-main);
            }

            .nav-links.show {
                display: flex;
            }

            .grid-4, .grid-3, .grid-2, .hero-stats, .step-timeline, .footer-grid {
                grid-template-columns: 1fr;
            }

            .hero-title {
                font-size: 1.8rem;
            }
        }