/* 全局变量与霓虹亮彩风主题 */
    :root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --primary: #2563eb;
      --neon-cyan: #00f2fe;
      --neon-purple: #7928ca;
      --neon-pink: #ff007f;
      --neon-glow: 0 0 20px rgba(0, 242, 254, 0.35);
      --border-color: #e2e8f0;
      --radius: 12px;
      --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 {
      overflow-x: hidden;
    }

    a {
      color: var(--primary);
      text-decoration: none;
      transition: all 0.2s ease;
    }

    a:hover {
      opacity: 0.85;
    }

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

    /* 顶部导航 */
    header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid rgba(0, 242, 254, 0.2);
      box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }

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

    .logo-box img {
      height: 40px;
      width: auto;
    }

    .ai-page-home-link {
      font-weight: 600;
      color: var(--text-main);
      padding: 6px 12px;
      border-radius: 6px;
      background: rgba(0, 242, 254, 0.1);
    }

    /* 必须显式设置 .nav-links gap 为 0 */
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      color: var(--text-main);
      font-size: 14px;
      font-weight: 500;
      padding: 8px 14px;
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--primary);
      background: rgba(37, 99, 235, 0.05);
      border-radius: 6px;
    }

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 8px;
      cursor: pointer;
      border: none;
      transition: all 0.3s ease;
      text-align: center;
    }

    .btn-neon {
      background: linear-gradient(135deg, var(--neon-cyan), var(--primary));
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(0, 242, 254, 0.4);
    }

    .btn-neon:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(0, 242, 254, 0.6);
      color: #ffffff;
    }

    .btn-outline {
      border: 1px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }

    .btn-outline:hover {
      background: rgba(37, 99, 235, 0.08);
    }

    /* Hero 首屏 - 严格禁止包含图片 */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% 20%, rgba(0, 242, 254, 0.12), transparent 70%),
                  radial-gradient(circle at 80% 80%, rgba(121, 40, 202, 0.08), transparent 50%),
                  var(--bg-main);
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      background: linear-gradient(90deg, rgba(0, 242, 254, 0.15), rgba(255, 0, 127, 0.15));
      border: 1px solid rgba(0, 242, 254, 0.4);
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 38px;
      font-weight: 800;
      letter-spacing: -0.5px;
      color: var(--text-main);
      margin-bottom: 20px;
      line-height: 1.25;
    }

    .hero-title span {
      background: linear-gradient(135deg, #00c6ff, #7928ca, #ff007f);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      max-width: 800px;
      margin: 0 auto 36px;
      font-size: 16px;
      color: var(--text-muted);
    }

    .hero-btns {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .metric-card {
      background: var(--bg-card);
      padding: 24px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 15px rgba(0, 0, 0, 0.02);
      transition: transform 0.3s ease, border-color 0.3s ease;
    }

    .metric-card:hover {
      transform: translateY(-4px);
      border-color: var(--neon-cyan);
      box-shadow: var(--neon-glow);
    }

    .metric-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 13px;
      color: var(--text-light);
    }

    /* 主体通用 Section */
    section {
      padding: 70px 0;
      border-bottom: 1px solid #edf2f7;
    }

    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-title {
      font-size: 28px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
      position: relative;
      display: inline-block;
    }

    .section-title::after {
      content: '';
      display: block;
      width: 40px;
      height: 4px;
      background: linear-gradient(90deg, var(--neon-cyan), var(--primary));
      margin: 8px auto 0;
      border-radius: 2px;
    }

    .section-subtitle {
      font-size: 15px;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
    }

    /* 网格卡片通用 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
    }

    .card {
      background: var(--bg-card);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      padding: 24px;
      transition: all 0.3s ease;
      position: relative;
    }

    .card:hover {
      box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05);
      border-color: rgba(0, 242, 254, 0.6);
      transform: translateY(-3px);
    }

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(0, 242, 254, 0.15), rgba(37, 99, 235, 0.15));
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 20px;
      font-weight: bold;
      margin-bottom: 16px;
    }

    .card-title {
      font-size: 18px;
      font-weight: 600;
      margin-bottom: 10px;
      color: var(--text-main);
    }

    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 标签云模型样式 */
    .models-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-tag {
      padding: 6px 14px;
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
      color: #1e293b;
      box-shadow: 0 2px 4px rgba(0,0,0,0.02);
    }

    .model-tag:hover {
      border-color: var(--neon-cyan);
      color: var(--primary);
      background: rgba(0, 242, 254, 0.05);
    }

    /* 表格样式 - 对比评测 & Token比价 */
    .table-container {
      overflow-x: auto;
      background: var(--bg-card);
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 15px rgba(0,0,0,0.02);
    }

    table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

    th, td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    th {
      background: #f1f5f9;
      color: var(--text-main);
      font-weight: 600;
    }

    tr:hover {
      background: #f8fafc;
    }

    .highlight-cell {
      background: rgba(0, 242, 254, 0.06);
      font-weight: 600;
      color: var(--primary);
    }

    /* 评分卡片 */
    .rating-banner {
      background: linear-gradient(135deg, rgba(0, 242, 254, 0.1), rgba(121, 40, 202, 0.08));
      border: 1px solid rgba(0, 242, 254, 0.3);
      border-radius: var(--radius);
      padding: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 24px;
    }

    .rating-score {
      font-size: 42px;
      font-weight: 900;
      color: var(--primary);
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 20px;
    }

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

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

    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-weight: bold;
    }

    /* FAQ 折叠 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-title {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-main);
      user-select: none;
    }

    .faq-title:hover {
      background: #f8fafc;
    }

    .faq-content {
      padding: 0 24px 18px;
      font-size: 14px;
      color: var(--text-muted);
      display: none;
      border-top: 1px dashed var(--border-color);
      margin-top: 4px;
      padding-top: 14px;
    }

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

    .faq-item.active .faq-toggle {
      transform: rotate(180deg);
    }

    .faq-toggle {
      transition: transform 0.3s ease;
    }

    /* 评论卡片 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px;
    }

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

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

    .review-info h4 {
      font-size: 15px;
      font-weight: 600;
    }

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

    /* 表单与联系方式 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      align-items: start;
    }

    .contact-info {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
    }

    .qr-box {
      margin-top: 20px;
      text-align: center;
      background: #f8fafc;
      padding: 16px;
      border-radius: 8px;
    }

    .qr-box img {
      max-width: 160px;
      height: auto;
      border-radius: 6px;
    }

    .form-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s;
    }

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

    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }

    /* 页脚与友情链接 */
    footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 50px 0 20px;
      font-size: 13px;
    }

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

    .footer-logo {
      margin-bottom: 16px;
      
    }

    .footer-links-title {
      color: #f8fafc;
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 14px;
    }

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

    .friendship-links a {
      color: #94a3b8;
      background: rgba(255, 255, 255, 0.05);
      padding: 4px 10px;
      border-radius: 4px;
    }

    .friendship-links a:hover {
      color: var(--neon-cyan);
      background: rgba(0, 242, 254, 0.1);
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      text-align: center;
      color: #64748b;
    }

    /* 浮动客服入口 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: linear-gradient(135deg, var(--neon-cyan), var(--primary));
      color: #fff;
      width: 54px;
      height: 54px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 6px 20px rgba(0, 242, 254, 0.5);
      cursor: pointer;
      font-size: 12px;
      font-weight: bold;
      text-align: center;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-metrics, .grid-4, .step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .review-grid, .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-inner {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
      }
    }

    @media (max-width: 576px) {
      .hero-title {
        font-size: 26px;
      }
      .hero-metrics, .grid-2 {
        grid-template-columns: 1fr;
      }
    }