/* 赛博暗夜高饱和粉紫风 核心样式规范 */
    :root {
      --bg-main: #0a0714;
      --bg-card: rgba(22, 13, 43, 0.75);
      --bg-card-hover: rgba(35, 20, 66, 0.9);
      --neon-pink: #ff007f;
      --neon-purple: #9d4edd;
      --neon-cyan: #00f0ff;
      --text-main: #ffffff;
      --text-sub: #c9c3e6;
      --text-muted: #8b83b3;
      --border-cyber: rgba(255, 0, 127, 0.3);
      --glow-pink: 0 0 20px rgba(255, 0, 127, 0.4);
      --glow-purple: 0 0 25px rgba(157, 78, 221, 0.5);
      --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-main);
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at 50% -20%, #2a0845 0%, #0a0714 60%);
      min-height: 100vh;
      overflow-x: hidden;
    }

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

    /* 通用标题与排版 */
    h1, h2, h3, h4 {
      color: #ffffff;
      font-weight: 700;
      line-height: 1.3;
    }

    .section-header {
      text-align: center;
      margin-bottom: 45px;
    }

    .section-title {
      font-size: 2.2rem;
      background: linear-gradient(135deg, #ffffff 20%, var(--neon-pink) 70%, var(--neon-cyan) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      margin-bottom: 12px;
      display: inline-block;
    }

    .section-subtitle {
      color: var(--text-sub);
      font-size: 1rem;
      max-width: 750px;
      margin: 0 auto;
    }

    a {
      color: var(--neon-cyan);
      text-decoration: none;
      transition: all 0.3s ease;
    }

    a:hover {
      color: var(--neon-pink);
      text-shadow: 0 0 8px var(--neon-pink);
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(10, 7, 20, 0.85);
      backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-cyber);
    }

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

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

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

    .nav-links {
      display: flex;
      gap: 0; /* 遵守规则：CSS .nav-links的gap属性设置为0 */
      align-items: center;
      list-style: none;
    }

    .nav-links li a {
      color: var(--text-sub);
      font-size: 0.92rem;
      padding: 8px 14px;
      display: block;
      white-space: nowrap;
      transition: color 0.3s;
    }

    .nav-links li a:hover {
      color: var(--neon-pink);
    }

    .btn-cyber {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      border-radius: 30px;
      background: linear-gradient(135deg, var(--neon-pink), var(--neon-purple));
      color: #ffffff !important;
      font-weight: 600;
      font-size: 0.95rem;
      box-shadow: var(--glow-pink);
      border: none;
      cursor: pointer;
      transition: transform 0.2s, box-shadow 0.2s;
      text-shadow: none;
    }

    .btn-cyber:hover {
      transform: translateY(-2px);
      box-shadow: 0 0 25px rgba(255, 0, 127, 0.8);
      color: #ffffff;
    }

    .btn-outline {
      background: transparent;
      border: 1px solid var(--neon-cyan);
      color: var(--neon-cyan) !important;
      box-shadow: 0 0 10px rgba(0, 240, 255, 0.2);
    }

    .btn-outline:hover {
      background: rgba(0, 240, 255, 0.15);
      box-shadow: 0 0 20px rgba(0, 240, 255, 0.5);
    }

    /* 移动端菜单按钮 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      color: var(--text-main);
      font-size: 1.5rem;
      cursor: pointer;
    }

    /* 首屏 HERO 区域 - 遵守规则：严禁包含任何图片资源 */
    .hero-section {
      padding: 90px 0 60px;
      text-align: center;
      position: relative;
      background: radial-gradient(ellipse at center, rgba(157, 78, 221, 0.2) 0%, rgba(10, 7, 20, 0) 70%);
    }

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

    /* H1 字数控制在20字以内 */
    .hero-h1 {
      font-size: 2.8rem;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
      background: linear-gradient(135deg, #ffffff 30%, #ff7ac6 70%, var(--neon-cyan) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-sub);
      max-width: 820px;
      margin: 0 auto 35px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      gap: 18px;
      justify-content: center;
      align-items: center;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .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-cyber);
      padding: 22px 15px;
      border-radius: 12px;
      backdrop-filter: blur(10px);
      transition: transform 0.3s;
    }

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

    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--neon-pink);
      margin-bottom: 5px;
      font-family: monospace;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-sub);
    }

    /* 通用Section */
    .section-padding {
      padding: 80px 0;
      border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    }

    /* 卡片网格 */
    .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-cyber);
      padding: 28px;
      border-radius: 14px;
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .cyber-card:hover {
      background: var(--bg-card-hover);
      border-color: var(--neon-pink);
      box-shadow: var(--glow-purple);
      transform: translateY(-4px);
    }

    .card-icon-tag {
      display: inline-block;
      padding: 4px 12px;
      background: rgba(0, 240, 255, 0.1);
      color: var(--neon-cyan);
      border-radius: 6px;
      font-size: 0.8rem;
      margin-bottom: 15px;
      border: 1px solid rgba(0, 240, 255, 0.3);
    }

    .card-title {
      font-size: 1.25rem;
      margin-bottom: 12px;
      color: #ffffff;
    }

    .card-text {
      color: var(--text-sub);
      font-size: 0.93rem;
      line-height: 1.6;
    }

    /* 包含模型的滚动/网格展示 */
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
    }

    .model-tag {
      background: rgba(157, 78, 221, 0.15);
      border: 1px solid rgba(157, 78, 221, 0.4);
      color: #e2d9ff;
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
    }

    /* 对比评测表格 */
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: var(--bg-card);
      border-radius: 14px;
      border: 1px solid var(--border-cyber);
    }

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

    .cyber-table th, .cyber-table td {
      padding: 18px 20px;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }

    .cyber-table th {
      background: rgba(157, 78, 221, 0.2);
      color: var(--neon-cyan);
      font-weight: 600;
    }

    .cyber-table tr:hover {
      background: rgba(255, 0, 127, 0.05);
    }

    .rating-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(255, 0, 127, 0.2);
      border: 1px solid var(--neon-pink);
      padding: 12px 24px;
      border-radius: 30px;
      color: #ffffff;
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 25px;
    }

    /* 案例展示区 */
    .case-card {
      background: var(--bg-card);
      border-radius: 14px;
      overflow: hidden;
      border: 1px solid var(--border-cyber);
    }

    .case-img-wrap {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background: #110a24;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s;
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.06);
    }

    .case-content {
      padding: 20px;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 15px;
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-cyber);
      border-radius: 10px;
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: #ffffff;
      transition: background 0.3s;
    }

    .faq-question:hover {
      background: rgba(255, 0, 127, 0.1);
    }

    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-sub);
      font-size: 0.94rem;
      display: none;
      border-top: 1px solid rgba(255, 255, 255, 0.05);
      padding-top: 15px;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    .faq-toggle-icon {
      color: var(--neon-pink);
      font-size: 1.2rem;
    }

    /* 表单组件 */
    .form-wrapper {
      max-width: 700px;
      margin: 0 auto;
      background: var(--bg-card);
      border: 1px solid var(--border-cyber);
      padding: 40px;
      border-radius: 16px;
      box-shadow: var(--glow-purple);
    }

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

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

    .form-control {
      width: 100%;
      padding: 12px 16px;
      background: rgba(10, 7, 20, 0.6);
      border: 1px solid rgba(255, 0, 127, 0.3);
      border-radius: 8px;
      color: #ffffff;
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.3s;
    }

    .form-control:focus {
      border-color: var(--neon-cyan);
      box-shadow: 0 0 10px rgba(0, 240, 255, 0.3);
    }

    textarea.form-control {
      min-height: 120px;
      resize: vertical;
    }

    /* 页脚样式 */
    .site-footer {
      background: #05030a;
      border-top: 1px solid var(--border-cyber);
      padding: 60px 0 30px;
      color: var(--text-muted);
      font-size: 0.88rem;
    }

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

    .footer-col h4 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 20px;
      border-left: 3px solid var(--neon-pink);
      padding-left: 10px;
    }

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

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

    .footer-links a {
      color: var(--text-sub);
    }

    .friendship-box {
      margin-top: 30px;
      padding-top: 20px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      display: flex;
      flex-wrap: wrap;
      gap: 15px;
      align-items: center;
    }

    .friendship-title {
      color: #ffffff;
      font-size: 0.9rem;
      font-weight: 600;
    }

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

    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      right: 25px;
      bottom: 25px;
      z-index: 999;
      background: var(--bg-card);
      border: 1px solid var(--neon-pink);
      border-radius: 12px;
      padding: 12px;
      box-shadow: var(--glow-pink);
      text-align: center;
      max-width: 140px;
    }

    .float-kefu img {
      width: 110px;
      height: 110px;
      border-radius: 6px;
      display: block;
      margin: 0 auto 6px;
    }

    .float-kefu span {
      font-size: 0.75rem;
      color: var(--neon-cyan);
      display: block;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .grid-4 { grid-template-columns: repeat(2, 1fr); }
      .grid-3 { grid-template-columns: repeat(2, 1fr); }
      .footer-grid { grid-template-columns: 1fr 1fr; }
      .hero-h1 { font-size: 2.2rem; }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: rgba(10, 7, 20, 0.95);
        flex-direction: column;
        padding: 20px 0;
        border-bottom: 1px solid var(--border-cyber);
      }
      .nav-links.show { display: flex; }
      .mobile-menu-btn { display: block; }
      .hero-stats { grid-template-columns: repeat(2, 1fr); }
      .grid-3, .grid-2, .grid-4 { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr; }
      .float-kefu { display: none; }
    }