:root {
      --primary-blue: #0052d9;
      --primary-hover: #003cab;
      --vibrant-blue: #1677ff;
      --accent-cyan: #00b4d8;
      --accent-soft: #e6f4ff;
      --bg-light: #f5f8fc;
      --card-bg: #ffffff;
      --text-dark: #1f2329;
      --text-sub: #4e5969;
      --text-muted: #86909c;
      --border-color: #e5e6eb;
      --shadow-sm: 0 2px 8px rgba(0, 82, 217, 0.06);
      --shadow-md: 0 8px 24px rgba(0, 82, 217, 0.08);
      --shadow-lg: 0 16px 36px rgba(0, 82, 217, 0.12);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --container-width: 1200px;
      --transition: all 0.28s ease;
    }

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

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-light);
      color: var(--text-dark);
      line-height: 1.6;
      background-image: radial-gradient(#d0e2ff 1px, transparent 1px);
      background-size: 32px 32px;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      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-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }

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

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary-blue);
      letter-spacing: -0.5px;
    }

    .nav-menu {
      display: flex;
      align-items: center;
    }

    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0; /* 约束指定为0 */
    }

    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-dark);
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary-blue);
      background-color: var(--accent-soft);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }

    .btn-primary {
      background-color: var(--primary-blue);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(0, 82, 217, 0.25);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-1px);
    }

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

    .btn-outline:hover {
      background: var(--accent-soft);
    }

    .btn-glow {
      background: linear-gradient(135deg, #0052d9, #00b4d8);
      color: #ffffff;
      font-weight: 700;
      box-shadow: 0 6px 20px rgba(0, 180, 216, 0.35);
    }

    .btn-glow:hover {
      box-shadow: 0 8px 25px rgba(0, 180, 216, 0.5);
      transform: translateY(-2px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-dark);
    }

    /* 首屏 Hero（无图片，纯科技排版） */
    .hero-section {
      padding: 70px 0 50px;
      position: relative;
      overflow: hidden;
      background: linear-gradient(180deg, #eef5ff 0%, #ffffff 100%);
      border-bottom: 1px solid var(--border-color);
    }

    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: var(--accent-soft);
      border: 1px solid #b5d7fe;
      border-radius: 30px;
      color: var(--primary-blue);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background: var(--accent-cyan);
      border-radius: 50%;
      box-shadow: 0 0 8px var(--accent-cyan);
    }

    .hero-layout {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 2.35rem;
      line-height: 1.25;
      font-weight: 800;
      color: #0b1f44;
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }

    .hero-desc {
      font-size: 1.1rem;
      color: var(--text-sub);
      margin-bottom: 28px;
      line-height: 1.65;
    }

    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }

    .hero-features-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px 24px;
      font-size: 0.9rem;
      color: var(--text-sub);
    }

    .hero-features-list span {
      display: flex;
      align-items: center;
      gap: 6px;
      font-weight: 500;
    }

    .hero-features-list span::before {
      content: "✓";
      color: var(--primary-blue);
      font-weight: bold;
    }

    /* 首屏右侧纯 CSS 科技卡片看板 */
    .hero-dashboard-card {
      background: #ffffff;
      border: 1px solid #d4e3fc;
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }

    .dash-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 16px;
      border-bottom: 1px solid #f0f4fa;
      margin-bottom: 20px;
    }

    .dash-title {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-dark);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .dash-status {
      font-size: 0.8rem;
      padding: 4px 10px;
      border-radius: 20px;
      background: #e6ffec;
      color: #1b8a36;
      font-weight: 600;
      border: 1px solid #b7eb8f;
    }

    .dash-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 14px;
      margin-bottom: 20px;
    }

    .dash-item {
      background: var(--bg-light);
      padding: 14px;
      border-radius: var(--radius-md);
      border: 1px solid #e5edf8;
    }

    .dash-label {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 4px;
    }

    .dash-value {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--primary-blue);
    }

    .model-tags-box {
      background: #f8faff;
      border-radius: var(--radius-sm);
      padding: 12px;
      border: 1px dashed #cadcf8;
    }

    .model-tags-title {
      font-size: 0.82rem;
      color: var(--text-sub);
      font-weight: 600;
      margin-bottom: 8px;
    }

    .model-tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .model-tag {
      font-size: 0.75rem;
      padding: 3px 8px;
      background: #ffffff;
      border: 1px solid #d9e5f7;
      border-radius: 4px;
      color: var(--text-sub);
      font-weight: 500;
    }

    /* 通用Section */
    .section-wrap {
      padding: 60px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 40px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary-blue);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      background: var(--accent-soft);
      padding: 4px 14px;
      border-radius: 20px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: #0b1f44;
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 数据指标卡 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-bottom: 30px;
    }

    .metric-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #b5d7fe;
    }

    .metric-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary-blue);
      line-height: 1.2;
      margin-bottom: 6px;
    }

    .metric-name {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 4px;
    }

    .metric-sub {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 服务能力与场景矩阵网格 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
      gap: 24px;
    }

    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #8cbdfa;
    }

    .card-icon-title {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .card-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: var(--accent-soft);
      color: var(--primary-blue);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: bold;
    }

    .card-icon-title h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: #0b1f44;
    }

    .card-text {
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .card-badges {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .card-tag {
      font-size: 0.75rem;
      padding: 2px 8px;
      background: #f0f4f9;
      color: #4b5b73;
      border-radius: 4px;
    }

    /* 图文视觉区 */
    .media-block {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 32px;
      box-shadow: var(--shadow-sm);
      margin-top: 30px;
    }

    .media-grid-2 {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
      align-items: center;
    }

    .img-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      border: 1px solid #eaedf3;
      background: #fbfcfe;
    }

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

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

    /* 对比评测表格板块 */
    .compare-container {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 30px;
      box-shadow: var(--shadow-md);
      overflow-x: auto;
    }

    .rating-header-box {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      padding-bottom: 20px;
      border-bottom: 2px solid #eef3fb;
      margin-bottom: 20px;
    }

    .rating-left h3 {
      font-size: 1.3rem;
      color: #0b1f44;
      margin-bottom: 4px;
    }

    .rating-badge-group {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .star-score {
      font-size: 1.4rem;
      font-weight: 800;
      color: #f59e0b;
    }

    .score-pill {
      background: linear-gradient(135deg, #0052d9, #1677ff);
      color: #ffffff;
      font-weight: 800;
      font-size: 1.1rem;
      padding: 6px 16px;
      border-radius: 30px;
    }

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

    .compare-table th,
    .compare-table td {
      padding: 16px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .compare-table th {
      background: #f5f8fc;
      color: var(--text-dark);
      font-weight: 700;
    }

    .col-highlight {
      background-color: #f0f7ff;
      font-weight: 600;
      color: var(--primary-blue);
    }

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

    .flow-step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      font-size: 1.8rem;
      font-weight: 900;
      color: #c7dcfa;
      line-height: 1;
      margin-bottom: 12px;
    }

    .flow-step-card h4 {
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: #0b1f44;
    }

    .flow-step-card p {
      font-size: 0.88rem;
      color: var(--text-sub);
    }

    /* 用户评论卡片 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .review-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;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .avatar-icon {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #0052d9, #00b4d8);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: bold;
      font-size: 1rem;
    }

    .user-meta h4 {
      font-size: 0.98rem;
      font-weight: 700;
      color: var(--text-dark);
    }

    .user-meta span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    .review-content {
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.6;
      font-style: normal;
    }

    .review-stars {
      color: #f59e0b;
      margin-top: 12px;
      font-size: 0.85rem;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .faq-question {
      width: 100%;
      padding: 18px 24px;
      text-align: left;
      background: none;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 1.02rem;
      font-weight: 700;
      color: var(--text-dark);
      cursor: pointer;
    }

    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary-blue);
      transition: transform 0.25s ease;
    }

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.65;
      border-top: 1px solid #f0f4f9;
      margin-top: -4px;
      padding-top: 14px;
    }

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

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

    /* 文章与资讯 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
    }

    .article-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .article-item:hover {
      border-color: var(--primary-blue);
      transform: translateY(-2px);
    }

    .article-title {
      font-size: 1rem;
      font-weight: 700;
      color: #0b1f44;
      margin-bottom: 10px;
      line-height: 1.4;
    }

    .article-link {
      color: var(--primary-blue);
      font-weight: 600;
      font-size: 0.88rem;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* 表单与需求匹配 */
    .contact-form-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }

    .contact-info-panel h3 {
      font-size: 1.5rem;
      color: #0b1f44;
      margin-bottom: 16px;
    }

    .contact-meta-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-bottom: 24px;
    }

    .contact-meta-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
      font-size: 0.95rem;
      color: var(--text-sub);
    }

    .contact-meta-item strong {
      color: var(--text-dark);
      min-width: 80px;
    }

    .kefu-qrcode-box {
      background: #f8faff;
      border: 1px dashed #cadcf8;
      border-radius: var(--radius-md);
      padding: 16px;
      display: inline-flex;
      align-items: center;
      gap: 16px;
    }

    .kefu-qrcode-box img {
      width: 96px;
      height: 96px;
      border-radius: 6px;
      object-fit: cover;
    }

    .kefu-tip h4 {
      font-size: 0.95rem;
      color: #0b1f44;
      margin-bottom: 4px;
    }

    .kefu-tip p {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    .lead-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group label {
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-dark);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #d0d7e2;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
      transition: var(--transition);
      background-color: #ffffff;
      color: var(--text-dark);
    }

    .form-control:focus {
      border-color: var(--primary-blue);
      box-shadow: 0 0 0 3px rgba(0, 82, 217, 0.12);
    }

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

    /* 友情链接与生态 */
    .links-section {
      background: #edf2f9;
      border-top: 1px solid #e1e7f0;
      padding: 28px 0;
    }

    .links-box {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 14px 20px;
    }

    .links-label {
      font-weight: 700;
      font-size: 0.9rem;
      color: #3b4859;
    }

    .links-box a {
      font-size: 0.88rem;
      color: var(--text-sub);
      background: #ffffff;
      padding: 4px 12px;
      border-radius: 4px;
      border: 1px solid #dbe3ee;
    }

    .links-box a:hover {
      color: var(--primary-blue);
      border-color: var(--primary-blue);
    }

    /* 页脚（独立深色/纯净规范） */
    .site-footer {
      background-color: #0d1a30;
      color: #c0ccdc;
      padding: 50px 0 30px;
      border-top: 1px solid #1c2b45;
    }

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

    .footer-brand h4 {
      font-size: 1.25rem;
      color: #ffffff;
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.6;
      color: #93a5be;
      max-width: 320px;
    }

    .footer-col h5 {
      font-size: 1rem;
      color: #ffffff;
      margin-bottom: 16px;
      font-weight: 600;
    }

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

    .footer-col ul li a {
      font-size: 0.88rem;
      color: #93a5be;
    }

    .footer-col ul li a:hover {
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid #1e2e4a;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.85rem;
      color: #72849d;
    }

    .footer-bottom a {
      color: #93a5be;
    }

    .footer-bottom a:hover {
      color: #ffffff;
    }

    /* 浮动工具栏 */
    .float-toolbar {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #ffffff;
      color: var(--primary-blue);
      border: 1px solid #d4e1f5;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      font-size: 1.1rem;
      transition: var(--transition);
    }

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

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-layout {
        grid-template-columns: 1fr;
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .media-grid-2 {
        grid-template-columns: 1fr;
      }
      .flow-steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-form-layout {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-menu {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        display: none;
        padding: 16px 0;
      }
      .nav-menu.active {
        display: block;
      }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        padding: 10px 24px;
        width: 100%;
      }
      .header-actions {
        display: none;
      }
      .hero-content h1 {
        font-size: 1.85rem;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .metrics-grid,
      .flow-steps-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }