:root {
      --primary-blue: #0F52BA;
      --vibrant-blue: #1E6BFF;
      --light-blue-bg: #F2F7FD;
      --card-bg: #FFFFFF;
      --text-main: #1C274C;
      --text-sub: #526180;
      --border-color: #E2ECF8;
      --accent-cyan: #00D2FF;
      --accent-orange: #FF7A00;
      --container-width: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
      background-color: var(--light-blue-bg);
      color: var(--text-main);
    }

    body {
      line-height: 1.6;
      background: linear-gradient(180deg, #EDF4FE 0%, #F8FAFD 100%);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

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

    header.site-header {
      background: rgba(255, 255, 255, 0.95);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 1000;
      backdrop-filter: blur(8px);
    }

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

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

    .brand-box .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-text {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary-blue);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }

    .nav-links li a {
      text-decoration: none;
      color: var(--text-main);
      font-size: 14px;
      font-weight: 500;
      padding: 8px 12px;
      border-radius: 6px;
      transition: all 0.25s ease;
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--vibrant-blue);
      background: rgba(30, 107, 255, 0.08);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 600;
      text-decoration: none;
      transition: all 0.25s ease;
      cursor: pointer;
      border: 1px solid transparent;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--vibrant-blue), var(--primary-blue));
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(15, 82, 186, 0.25);
    }

    .btn-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 20px rgba(15, 82, 186, 0.35);
    }

    .btn-secondary {
      background: #FFFFFF;
      color: var(--primary-blue);
      border-color: var(--border-color);
    }

    .btn-secondary:hover {
      background: rgba(30, 107, 255, 0.05);
      border-color: var(--vibrant-blue);
    }

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

    /* 首屏 Hero */
    .hero-section {
      padding: 80px 0 60px;
      text-align: center;
      background: radial-gradient(circle at center top, rgba(30, 107, 255, 0.12) 0%, rgba(242, 247, 253, 0) 70%);
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(30, 107, 255, 0.08);
      color: var(--primary-blue);
      padding: 6px 16px;
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 24px;
      border: 1px solid rgba(30, 107, 255, 0.2);
    }

    .hero-title {
      font-size: 42px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      color: var(--vibrant-blue);
    }

    .hero-desc {
      font-size: 17px;
      line-height: 1.6;
      color: var(--text-sub);
      max-width: 820px;
      margin: 0 auto 36px;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }

    .hero-actions .btn {
      padding: 13px 30px;
      font-size: 16px;
    }

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

    .stat-card {
      background: var(--card-bg);
      padding: 24px 16px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 16px rgba(15, 82, 186, 0.04);
      transition: transform 0.25s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
    }

    .stat-number {
      font-size: 32px;
      font-weight: 800;
      color: var(--vibrant-blue);
      margin-bottom: 4px;
    }

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

    /* 公用章节 */
    .section-block {
      padding: 70px 0;
    }

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

    .section-tag {
      font-size: 13px;
      font-weight: 700;
      color: var(--vibrant-blue);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 15px;
      color: var(--text-sub);
      max-width: 650px;
      margin: 0 auto;
    }

    /* 平台矩阵与聚合 */
    .platform-chips {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-bottom: 40px;
    }

    .model-chip {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      padding: 7px 16px;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
      transition: all 0.2s ease;
    }

    .model-chip:hover {
      border-color: var(--vibrant-blue);
      color: var(--vibrant-blue);
      transform: translateY(-2px);
    }

    /* 场景与能力网格 */
    .feature-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .card-item {
      background: var(--card-bg);
      border-radius: 12px;
      border: 1px solid var(--border-color);
      padding: 24px;
      box-shadow: 0 4px 16px rgba(15, 82, 186, 0.04);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .card-item:hover {
      transform: translateY(-4px);
      box-shadow: 0 8px 24px rgba(15, 82, 186, 0.08);
      border-color: rgba(30, 107, 255, 0.3);
    }

    .card-icon-wrap {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: rgba(30, 107, 255, 0.1);
      color: var(--vibrant-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 18px;
      margin-bottom: 16px;
    }

    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 流程步骤 */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }

    .step-box {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 28px 20px;
      text-align: center;
      position: relative;
    }

    .step-badge {
      width: 36px;
      height: 36px;
      background: var(--vibrant-blue);
      color: #fff;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
    }

    /* 对比表格 */
    .compare-wrap {
      background: var(--card-bg);
      border-radius: 14px;
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: 0 4px 20px rgba(15, 82, 186, 0.05);
    }

    .compare-score-banner {
      background: linear-gradient(135deg, var(--primary-blue), var(--vibrant-blue));
      color: #FFFFFF;
      padding: 20px 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
    }

    .compare-score-banner .score-title {
      font-size: 20px;
      font-weight: 700;
    }

    .compare-score-banner .score-value {
      font-size: 28px;
      font-weight: 800;
      color: var(--accent-cyan);
    }

    .table-responsive {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

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

    .table-responsive th {
      background: #F8FAFD;
      color: var(--text-main);
      font-weight: 700;
    }

    .table-responsive tr:last-child td {
      border-bottom: none;
    }

    .table-highlight {
      background: rgba(30, 107, 255, 0.03);
      font-weight: 600;
      color: var(--primary-blue);
    }

    /* 素材案例展示 */
    .media-gallery {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 30px;
    }

    .media-item {
      background: var(--card-bg);
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: 0 4px 16px rgba(15, 82, 186, 0.04);
    }

    .media-item img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }

    .media-item:hover img {
      transform: scale(1.02);
    }

    .media-info {
      padding: 18px 20px;
    }

    .media-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .media-desc {
      font-size: 13px;
      color: var(--text-sub);
    }

    /* 评论卡片 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testi-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testi-text {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .testi-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
    }

    .author-role {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-tag {
      font-size: 12px;
      color: var(--vibrant-blue);
    }

    /* FAQ 折叠 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
      transition: border-color 0.2s ease;
    }

    .faq-question {
      padding: 18px 22px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .faq-question::after {
      content: "+";
      font-size: 20px;
      color: var(--vibrant-blue);
      font-weight: 400;
      transition: transform 0.2s ease;
    }

    .faq-item.active .faq-question::after {
      content: "-";
      transform: rotate(180deg);
    }

    .faq-answer {
      display: none;
      padding: 0 22px 18px;
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.6;
      border-top: 1px solid #F0F4FA;
    }

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

    /* 表单与服务网点 */
    .form-section-layout {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 36px;
      align-items: start;
    }

    .form-wrapper {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 36px;
      box-shadow: 0 4px 20px rgba(15, 82, 186, 0.05);
    }

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

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

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

    .form-control:focus {
      border-color: var(--vibrant-blue);
      background: #FFFFFF;
    }

    textarea.form-control {
      resize: vertical;
      min-height: 90px;
    }

    .contact-info-panel {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 32px;
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .contact-item-row {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .contact-meta-label {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      min-width: 72px;
    }

    .contact-meta-val {
      font-size: 14px;
      color: var(--text-sub);
    }

    .qr-container {
      margin-top: 10px;
      padding: 16px;
      background: #F8FAFD;
      border-radius: 10px;
      text-align: center;
      border: 1px dashed var(--border-color);
    }

    .qr-container img {
      width: 120px;
      height: 120px;
      display: inline-block;
      border-radius: 6px;
      margin-bottom: 8px;
    }

    /* 文章列表与外链 */
    .article-links-wrap {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
      margin-top: 24px;
    }

    .article-link-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      list-style: none;
      margin-top: 12px;
    }

    .article-link-list li a {
      font-size: 13px;
      color: var(--vibrant-blue);
      text-decoration: none;
      background: #F0F6FF;
      padding: 6px 14px;
      border-radius: 6px;
      display: inline-block;
      transition: all 0.2s ease;
    }

    .article-link-list li a:hover {
      background: var(--vibrant-blue);
      color: #fff;
    }

    /* 页脚 */
    footer.site-footer {
      background: #0B1930;
      color: #CAD5E2;
      padding: 50px 0 24px;
      margin-top: 60px;
    }

    .footer-top-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-heading {
      color: #FFFFFF;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links-list a {
      color: #A0B2C6;
      text-decoration: none;
      font-size: 14px;
      transition: color 0.2s ease;
    }

    .footer-links-list a:hover {
      color: #FFFFFF;
    }

    .footer-friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .footer-friend-links a {
      color: #8CA0B8;
      text-decoration: none;
      font-size: 13px;
      transition: color 0.2s ease;
    }

    .footer-friend-links a:hover {
      color: var(--accent-cyan);
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 13px;
      color: #718296;
    }

    /* 浮动工具 */
    .float-sidebar {
      position: fixed;
      right: 20px;
      bottom: 40px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      background: var(--vibrant-blue);
      color: #FFFFFF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      font-size: 12px;
      font-weight: 700;
      box-shadow: 0 4px 12px rgba(15, 82, 186, 0.35);
      cursor: pointer;
      border: none;
      transition: all 0.2s ease;
    }

    .float-btn:hover {
      transform: scale(1.08);
      background: var(--primary-blue);
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 32px;
      }
      .hero-stats-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .feature-grid-3, .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .feature-grid-4, .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .form-section-layout {
        grid-template-columns: 1fr;
      }
      .footer-top-grid {
        grid-template-columns: 1fr 1fr;
      }
      .media-gallery {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 16px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
        text-align: center;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 26px;
      }
      .hero-stats-row {
        grid-template-columns: 1fr;
      }
      .feature-grid-3, .feature-grid-4, .testimonial-grid, .flow-steps {
        grid-template-columns: 1fr;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        text-align: center;
      }
    }