:root {
      --bg-main: #f4f7fc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --neon-cyan: #00d2ff;
      --neon-magenta: #e024e0;
      --neon-blue: #3b82f6;
      --accent-gradient: linear-gradient(135deg, #00c6ff 0%, #0072ff 50%, #b507e0 100%);
      --card-shadow: 0 10px 30px rgba(15, 23, 42, 0.06);
      --neon-shadow: 0 0 20px rgba(0, 210, 255, 0.25);
      --border-color: rgba(226, 232, 240, 0.8);
      --radius: 12px;
      --max-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;
      background: radial-gradient(circle at 10% 10%, rgba(0, 210, 255, 0.05) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(224, 36, 224, 0.05) 0%, transparent 40%),
                  var(--bg-main);
    }

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

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

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      text-decoration: none;
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      color: var(--text-main);
      text-decoration: none;
      font-size: 14px;
      font-weight: 500;
      transition: color 0.2s, transform 0.2s;
    }

    .nav-links li a:hover,
    .nav-links li a.ai-page-home-link {
      color: #0072ff;
      transform: translateY(-1px);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      border-radius: 30px;
      font-size: 14px;
      font-weight: 600;
      text-decoration: none;
      transition: all 0.3s ease;
      cursor: pointer;
      border: none;
    }

    .btn-neon {
      background: var(--accent-gradient);
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(0, 114, 255, 0.35);
    }

    .btn-neon:hover {
      box-shadow: 0 6px 20px rgba(181, 7, 224, 0.45);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid rgba(0, 114, 255, 0.4);
    }

    .btn-outline:hover {
      background: rgba(0, 114, 255, 0.05);
      border-color: #0072ff;
      color: #0072ff;
    }

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 首屏 HERO 区域 - 绝对不包含图片 */
    .hero-section {
      padding: 90px 0 60px;
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-block;
      padding: 6px 16px;
      border-radius: 20px;
      background: rgba(0, 210, 255, 0.1);
      border: 1px solid rgba(0, 210, 255, 0.3);
      color: #0072ff;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 20px;
      letter-spacing: 0.5px;
    }

    .hero-title {
      font-size: 2.5rem;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #0f172a 30%, #0072ff 70%, #b507e0 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 35px;
      line-height: 1.7;
    }

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

    .hero-actions .btn {
      padding: 14px 32px;
      font-size: 16px;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }

    .stat-card {
      background: var(--bg-card);
      padding: 22px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: transform 0.3s;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      border-color: rgba(0, 210, 255, 0.5);
    }

    .stat-num {
      font-size: 2rem;
      font-weight: 800;
      color: #0072ff;
      margin-bottom: 5px;
    }

    .stat-desc {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 模块通用样式 */
    .section-padding {
      padding: 70px 0;
    }

    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 50px;
    }

    .section-tag {
      color: #0072ff;
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
    }

    /* 网格与卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
    }

    .card {
      background: var(--bg-card);
      border-radius: var(--radius);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      position: relative;
      overflow: hidden;
    }

    .card:hover {
      transform: translateY(-5px);
      box-shadow: 0 15px 35px rgba(0, 114, 255, 0.12);
      border-color: rgba(0, 210, 255, 0.4);
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: linear-gradient(135deg, rgba(0,210,255,0.1), rgba(181,7,224,0.1));
      color: #0072ff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 20px;
      margin-bottom: 18px;
    }

    .card-title {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

    /* 模型标签云 */
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      margin-top: 20px;
      justify-content: center;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      color: var(--text-main);
      font-weight: 500;
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
      transition: all 0.2s;
    }

    .model-tag:hover {
      border-color: #0072ff;
      color: #0072ff;
      transform: scale(1.05);
    }

    /* 流程步骤 */
    .step-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 20px;
    }

    .step-item {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .step-num {
      font-size: 1.8rem;
      font-weight: 900;
      color: rgba(0, 114, 255, 0.2);
      position: absolute;
      top: 15px;
      right: 20px;
    }

    /* 对比表格 */
    .table-wrapper {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

    .rating-banner {
      background: linear-gradient(135deg, rgba(0,114,255,0.05), rgba(181,7,224,0.05));
      padding: 20px 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px solid var(--border-color);
      flex-wrap: wrap;
      gap: 15px;
    }

    .rating-score {
      font-size: 1.5rem;
      font-weight: 800;
      color: #0072ff;
    }

    .rating-stars {
      color: #ff9800;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    .custom-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

    .highlight-col {
      background: rgba(0, 114, 255, 0.02);
      font-weight: 600;
      color: #0072ff;
    }

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

    .case-card {
      background: #ffffff;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

    .case-card-img {
      width: 100%;
      height: 200px;
      object-fit: cover;
      display: block;
    }

    .case-card-body {
      padding: 20px;
    }

    /* 评论卡片 */
    .review-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 20px;
    }

    .review-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 15px;
    }

    .user-avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--accent-gradient);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
    }

    /* FAQ 手风琴 */
    .faq-accordion {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      margin-bottom: 12px;
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      font-size: 16px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-main);
    }

    .faq-answer {
      padding: 0 24px 18px;
      font-size: 14px;
      color: var(--text-muted);
      display: none;
      border-top: 1px dashed var(--border-color);
      padding-top: 15px;
    }

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

    .faq-toggle-icon {
      font-weight: bold;
      transition: transform 0.3s;
    }

    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }

    /* 表单与联系 */
    .contact-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: #ffffff;
      padding: 40px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }

    .contact-info {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .qr-box {
      margin-top: 15px;
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

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

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

    .custom-form input,
    .custom-form select,
    .custom-form textarea {
      width: 100%;
      padding: 12px 16px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      background: #f8fafc;
      font-size: 14px;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s;
    }

    .custom-form input:focus,
    .custom-form select:focus,
    .custom-form textarea:focus {
      border-color: #0072ff;
      background: #fff;
    }

    /* 友情链接与页脚 */
    .links-section {
      background: #ffffff;
      padding: 30px 0;
      border-top: 1px solid var(--border-color);
    }

    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 15px;
      align-items: center;
    }

    .friend-links-box a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 13px;
      transition: color 0.2s;
    }

    .friend-links-box a:hover {
      color: #0072ff;
    }

    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 40px 0;
      font-size: 14px;
    }

    .footer-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    .footer-links a {
      color: #cbd5e1;
      text-decoration: none;
      margin-left: 20px;
    }

    .footer-links a:hover {
      color: #00d2ff;
    }

    /* 浮动客服 */
    .float-service {
      position: fixed;
      right: 25px;
      bottom: 25px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--accent-gradient);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      box-shadow: 0 4px 15px rgba(0,0,0,0.2);
      font-size: 12px;
      text-align: center;
      font-weight: bold;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .contact-container {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }

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

      .nav-toggle {
        display: block;
      }

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

      .hero-subtitle {
        font-size: 1rem;
      }
    }