:root {
      --primary-color: #0b57d0;
      --primary-hover: #0842a0;
      --accent-color: #0070f3;
      --accent-warm: #ff5722;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-sub: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 16px -2px rgba(15, 23, 42, 0.08);
      --shadow-hover: 0 12px 24px -4px rgba(11, 87, 208, 0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --radius-full: 9999px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      padding: 8px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary-color);
      background-color: rgba(11, 87, 208, 0.05);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .nav-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 8px 18px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-full);
      background-color: var(--primary-color);
      color: #ffffff !important;
      border: 1px solid var(--primary-color);
      box-shadow: 0 2px 6px rgba(11, 87, 208, 0.25);
    }
    .nav-btn:hover {
      background-color: var(--primary-hover);
      transform: translateY(-1px);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
      color: var(--text-main);
    }

    /* 区域通用结构 */
    .section-wrap {
      padding: 72px 0;
      border-bottom: 1px solid rgba(226, 232, 240, 0.6);
    }
    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }
    .badge-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary-color);
      background: rgba(11, 87, 208, 0.08);
      border: 1px solid rgba(11, 87, 208, 0.15);
      border-radius: var(--radius-full);
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 28px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.35;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 首屏 Hero (不含图片) */
    .hero-section {
      background: linear-gradient(180deg, #f0f6ff 0%, #ffffff 100%);
      padding: 80px 0 64px;
      text-align: center;
      position: relative;
    }
    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      background: #ffffff;
      padding: 6px 18px;
      border-radius: var(--radius-full);
      box-shadow: var(--shadow-sm);
      border: 1px solid var(--border-color);
      margin-bottom: 24px;
    }
    .hero-badge-point {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
      margin-right: 8px;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }
    .hero-badge-text {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }
    .hero-title {
      font-size: 38px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px;
      line-height: 1.65;
    }
    .hero-btn-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }
    .hero-btn-primary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 34px;
      font-size: 16px;
      font-weight: 700;
      color: #ffffff !important;
      background: linear-gradient(135deg, #0b57d0 0%, #1e40af 100%);
      border-radius: var(--radius-full);
      box-shadow: 0 6px 20px rgba(11, 87, 208, 0.35);
      border: none;
      transition: all 0.25s ease;
    }
    .hero-btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(11, 87, 208, 0.45);
    }
    .hero-btn-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 14px 28px;
      font-size: 16px;
      font-weight: 600;
      color: var(--primary-color);
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-full);
      box-shadow: var(--shadow-sm);
    }
    .hero-btn-secondary:hover {
      background: #f1f5f9;
      border-color: #cbd5e1;
    }

    /* 状态与统计条 */
    .stat-bar-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1040px;
      margin: 0 auto;
    }
    .stat-card {
      background: #ffffff;
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
    }
    .stat-card .num {
      font-size: 26px;
      font-weight: 800;
      color: var(--primary-color);
      line-height: 1.2;
      margin-bottom: 4px;
    }
    .stat-card .desc {
      font-size: 13px;
      color: var(--text-sub);
    }

    /* 模型矩阵与服务网格 */
    .model-pills {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 24px;
    }
    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--text-main);
      padding: 6px 14px;
      font-size: 13px;
      border-radius: var(--radius-full);
      font-weight: 500;
      box-shadow: 0 1px 2px rgba(0,0,0,0.03);
    }

    /* 服务能力卡片 */
    .grid-cards {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: rgba(11, 87, 208, 0.3);
    }
    .card-icon-box {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: rgba(11, 87, 208, 0.08);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 18px;
      margin-bottom: 16px;
    }
    .service-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 左右分栏与特色展示 */
    .split-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
      margin-bottom: 48px;
    }
    .split-text h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 14px;
      color: var(--text-main);
    }
    .split-text p {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
    }
    .feature-list {
      list-style: none;
    }
    .feature-list li {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .feature-list li::before {
      content: "✓";
      color: var(--primary-color);
      font-weight: 700;
    }
    .media-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .media-box img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    /* 流程步骤 */
    .step-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }
    .step-number {
      font-size: 14px;
      font-weight: 800;
      color: var(--primary-color);
      background: rgba(11, 87, 208, 0.1);
      display: inline-block;
      padding: 2px 10px;
      border-radius: var(--radius-full);
      margin-bottom: 12px;
    }
    .step-item h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .step-item p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 对比表格 */
    .table-responsive {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }
    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .compare-table th {
      background-color: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }
    .compare-table .highlight-col {
      background-color: rgba(11, 87, 208, 0.03);
      font-weight: 600;
      color: var(--primary-color);
    }
    .rating-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #fef2f2;
      border: 1px solid #fee2e2;
      color: #dc2626;
      padding: 6px 14px;
      border-radius: var(--radius-full);
      font-size: 14px;
      font-weight: 700;
      margin-bottom: 16px;
    }

    /* 评论卡片 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .comment-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .comment-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }
    .comment-user {
      display: flex;
      align-items: center;
      gap: 10px;
      border-top: 1px dashed var(--border-color);
      padding-top: 12px;
    }
    .user-avatar-tag {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--text-main);
      font-size: 14px;
    }
    .user-info .name {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }
    .user-info .role {
      font-size: 12px;
      color: var(--text-sub);
    }

    /* FAQ 手风琴面板 */
    .faq-list {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.2s ease;
    }
    .faq-question {
      padding: 18px 22px;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }
    .faq-question:hover {
      background: #f8fafc;
    }
    .faq-icon {
      font-size: 18px;
      font-weight: 400;
      color: var(--text-sub);
      transition: transform 0.2s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      display: none;
      padding: 0 22px 18px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      border-top: 1px solid #f1f5f9;
    }
    .faq-item.active .faq-answer {
      display: block;
    }

    /* 需求匹配与联系表单 */
    .contact-form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .form-group {
      margin-bottom: 18px;
    }
    .form-group 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: var(--radius-sm);
      font-size: 14px;
      color: var(--text-main);
      background: #ffffff;
      outline: none;
      transition: border-color 0.2s ease;
    }
    .form-control:focus {
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(11, 87, 208, 0.1);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 100px;
    }
    .btn-submit {
      width: 100%;
      padding: 14px;
      background: var(--primary-color);
      color: #ffffff;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 700;
      cursor: pointer;
      transition: background-color 0.2s ease;
    }
    .btn-submit:hover {
      background: var(--primary-hover);
    }
    .contact-detail-box {
      background: #f8fafc;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .qr-box {
      text-align: center;
      margin-top: 20px;
      padding: 16px;
      background: #ffffff;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      display: inline-block;
      margin-left: auto;
      margin-right: auto;
    }
    .qr-box img {
      width: 120px;
      height: 120px;
      display: block;
      margin: 0 auto 8px;
    }
    .qr-box span {
      font-size: 12px;
      color: var(--text-sub);
    }

    /* 资讯列表 */
    .article-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 24px;
    }
    .article-link-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: var(--radius-full);
      font-size: 13px;
      color: var(--text-muted);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }
    .article-link-tag:hover {
      color: var(--primary-color);
      border-color: var(--primary-color);
    }

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 56px 0 24px;
      color: var(--text-muted);
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-column h5 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .footer-column ul {
      list-style: none;
    }
    .footer-column ul li {
      margin-bottom: 10px;
    }
    .footer-column ul li a {
      color: var(--text-muted);
    }
    .footer-column ul li a:hover {
      color: var(--primary-color);
    }
    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
    }
    .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
    }
    .friend-links a {
      font-size: 13px;
      color: var(--text-sub);
    }
    .friend-links a:hover {
      color: var(--primary-color);
    }

    /* 悬浮客服面板 */
    .fixed-kefu {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .kefu-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 12px;
      font-weight: 700;
      color: var(--primary-color);
      transition: all 0.2s ease;
    }
    .kefu-btn:hover {
      transform: scale(1.08);
      background: var(--primary-color);
      color: #ffffff;
    }

    /* 响应式适配 */
    @media (max-width: 992px) {
      .stat-bar-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-cards {
        grid-template-columns: repeat(2, 1fr);
      }
      .split-row {
        grid-template-columns: 1fr;
      }
      .step-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 14px;
      }
      .hero-title {
        font-size: 28px;
      }
      .hero-subtitle {
        font-size: 15px;
      }
      .grid-cards {
        grid-template-columns: 1fr;
      }
      .step-grid {
        grid-template-columns: 1fr;
      }
      .contact-form-grid {
        grid-template-columns: 1fr;
        padding: 20px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }