:root {
      --primary-color: #059669;
      --primary-hover: #047857;
      --primary-light: #ecfdf5;
      --accent-color: #10b981;
      --text-dark: #111827;
      --text-muted: #4b5563;
      --text-light: #9ca3af;
      --bg-main: #fcfdfc;
      --bg-alt: #f0fdf4;
      --bg-card: #ffffff;
      --border-color: #d1fae5;
      --border-subtle: #e5e7eb;
      --shadow-sm: 0 1px 3px rgba(5, 150, 105, 0.08);
      --shadow-md: 0 4px 14px rgba(5, 150, 105, 0.12);
      --shadow-lg: 0 10px 25px rgba(5, 150, 105, 0.15);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --transition: all 0.28s ease;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-main);
      color: var(--text-dark);
    }

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

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

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

    /* 顶部导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      max-width: 220px;
    }

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

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

    .nav-links li a {
      padding: 8px 12px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-dark);
      border-radius: var(--radius-sm);
      display: inline-block;
    }

    .nav-links li a:hover {
      color: var(--primary-color);
      background-color: var(--primary-light);
    }

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

    .btn-nav-primary {
      background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
      color: #ffffff !important;
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 14px;
      font-weight: 600;
      box-shadow: 0 2px 8px rgba(16, 185, 129, 0.3);
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .btn-nav-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }
    .mobile-menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--text-dark);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* 区块通用骨架 */
    section.page-section {
      padding: 70px 0;
      position: relative;
    }

    .section-alt {
      background: linear-gradient(180deg, #f0fdf4 0%, #ffffff 100%);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px auto;
    }

    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary-color);
      background-color: var(--primary-light);
      padding: 4px 14px;
      border-radius: 14px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
      border: 1px solid var(--border-color);
    }

    .section-title {
      font-size: 28px;
      font-weight: 700;
      color: var(--text-dark);
      line-height: 1.35;
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 首屏 HERO（严格无图片，使用高辨识度纯色渐变、卡片与交互按钮） */
    .hero-section {
      padding: 70px 0 60px 0;
      background: radial-gradient(circle at 50% 10%, #d1fae5 0%, #f0fdf4 40%, #ffffff 85%);
      position: relative;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #ffffff;
      border: 1px solid var(--accent-color);
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary-color);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background: var(--accent-color);
      border-radius: 50%;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.25);
    }

    h1.hero-title {
      font-size: 40px;
      font-weight: 800;
      color: #064e3b;
      line-height: 1.25;
      letter-spacing: -0.5px;
      margin-bottom: 20px;
    }

    .hero-subtitle {
      font-size: 17px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 720px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .btn-hero-primary {
      background: linear-gradient(135deg, #10b981 0%, #059669 100%);
      color: #ffffff !important;
      font-size: 17px;
      font-weight: 700;
      padding: 14px 34px;
      border-radius: 30px;
      box-shadow: 0 6px 20px rgba(5, 150, 105, 0.35);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      transition: var(--transition);
    }
    .btn-hero-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 25px rgba(5, 150, 105, 0.45);
    }

    .btn-hero-secondary {
      background: #ffffff;
      color: var(--primary-color) !important;
      font-size: 16px;
      font-weight: 600;
      padding: 13px 28px;
      border-radius: 30px;
      border: 1.5px solid var(--primary-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .btn-hero-secondary:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
    }

    .hero-highlights-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      text-align: left;
    }

    .hero-metric-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 18px 20px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .hero-metric-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
      border-color: var(--accent-color);
    }

    .metric-value {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary-color);
      margin-bottom: 4px;
    }
    .metric-label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台介绍 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
    }

    .about-info-panel {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .about-feature-list {
      list-style: none;
      margin-top: 20px;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .about-feature-list li {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-size: 15px;
      color: var(--text-dark);
    }

    .check-icon {
      color: var(--primary-color);
      font-weight: 800;
      flex-shrink: 0;
    }

    /* 服务能力卡片网格 */
    .service-cards-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

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

    .service-header {
      margin-bottom: 14px;
    }

    .service-tag {
      font-size: 12px;
      font-weight: 600;
      color: var(--primary-color);
      background: var(--primary-light);
      padding: 2px 8px;
      border-radius: 4px;
      display: inline-block;
      margin-bottom: 8px;
    }

    .service-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 8px;
    }

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

    .service-footer {
      margin-top: 18px;
      padding-top: 14px;
      border-top: 1px dashed var(--border-subtle);
      display: flex;
      align-items: center;
      justify-content: space-between;
      font-size: 13px;
      color: var(--primary-color);
      font-weight: 600;
    }

    /* 聚合支持模型芯片标签云 */
    .models-cloud-panel {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-top: 40px;
      box-shadow: var(--shadow-sm);
      text-align: center;
    }

    .models-cloud-panel h4 {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-dark);
      margin-bottom: 16px;
    }

    .chips-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .model-chip {
      background: var(--bg-alt);
      border: 1px solid var(--border-color);
      color: #065f46;
      font-size: 13px;
      font-weight: 600;
      padding: 6px 14px;
      border-radius: 20px;
      transition: var(--transition);
    }
    .model-chip:hover {
      background: var(--primary-color);
      color: #ffffff;
      border-color: var(--primary-color);
    }

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

    .process-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: 28px;
      font-weight: 900;
      color: var(--accent-color);
      opacity: 0.8;
      margin-bottom: 10px;
      line-height: 1;
    }

    .process-step-card h3 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .process-step-card p {
      font-size: 13.5px;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 案例展示区（带图） */
    .media-showcase-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      align-items: stretch;
    }

    .media-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 20px;
      box-shadow: var(--shadow-sm);
    }

    .media-image-container {
      width: 100%;
      border-radius: var(--radius-md);
      overflow: hidden;
      margin-bottom: 14px;
      background: #f3f4f6;
    }

    .media-image-container img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
      transition: var(--transition);
    }
    .media-image-container img:hover {
      transform: scale(1.02);
    }

    /* 对比评测表格与评分徽章 */
    .eval-score-card {
      background: linear-gradient(135deg, #065f46 0%, #047857 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      box-shadow: var(--shadow-md);
    }

    .eval-score-main h3 {
      font-size: 22px;
      font-weight: 700;
      margin-bottom: 6px;
      color: #ffffff;
    }

    .eval-score-main p {
      font-size: 14px;
      color: #a7f3d0;
    }

    .eval-score-val {
      text-align: right;
    }

    .eval-score-val .score-big {
      font-size: 42px;
      font-weight: 900;
      line-height: 1;
      color: #34d399;
    }
    .eval-score-val .score-total {
      font-size: 16px;
      opacity: 0.8;
    }
    .eval-stars {
      color: #facc15;
      font-size: 18px;
      letter-spacing: 2px;
      margin-top: 4px;
    }

    .comparison-table-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

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

    .comparison-table th, .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-subtle);
    }

    .comparison-table th {
      background: var(--bg-alt);
      color: var(--text-dark);
      font-weight: 700;
    }

    .highlight-col {
      background: #f0fdf4;
      color: #065f46;
      font-weight: 600;
    }

    /* 用户评论 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .testimonial-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;
    }

    .testimonial-quote {
      font-size: 14px;
      color: var(--text-dark);
      line-height: 1.65;
      margin-bottom: 18px;
      position: relative;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .user-avatar-badge {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 16px;
      border: 1px solid var(--border-color);
    }

    .user-meta h4 {
      font-size: 14px;
      font-weight: 700;
    }
    .user-meta span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-accordion {
      max-width: 860px;
      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;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .faq-question {
      width: 100%;
      padding: 18px 22px;
      text-align: left;
      background: none;
      border: none;
      font-size: 15px;
      font-weight: 700;
      color: var(--text-dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .faq-icon {
      font-size: 18px;
      color: var(--primary-color);
      transition: transform 0.28s ease;
      font-weight: bold;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #fafdfa;
      padding: 0 22px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    .faq-item.active {
      border-color: var(--accent-color);
    }

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

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 22px 18px 22px;
    }

    /* 联系与表单提交 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 32px;
      align-items: start;
    }

    .contact-form-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

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

    .form-group label {
      display: block;
      font-size: 13.5px;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-dark);
    }

    .form-control {
      width: 100%;
      padding: 11px 14px;
      border: 1px solid var(--border-subtle);
      border-radius: var(--radius-sm);
      font-size: 14px;
      color: var(--text-dark);
      background: #ffffff;
      transition: var(--transition);
      font-family: inherit;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--accent-color);
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
    }

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

    .btn-submit {
      width: 100%;
      background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
      color: #ffffff;
      font-size: 15px;
      font-weight: 700;
      padding: 13px;
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 4px 12px rgba(5, 150, 105, 0.25);
      transition: var(--transition);
    }
    .btn-submit:hover {
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(5, 150, 105, 0.35);
    }

    .contact-direct-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .contact-qrcode-wrap {
      text-align: center;
      margin: 20px 0;
      padding: 16px;
      background: var(--bg-alt);
      border-radius: var(--radius-md);
      border: 1px dashed var(--border-color);
    }

    .contact-qrcode-wrap img {
      max-width: 140px;
      height: auto;
      display: inline-block;
      border-radius: var(--radius-sm);
      background: #ffffff;
      padding: 4px;
    }

    .contact-items-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 14px;
    }

    .contact-items-list strong {
      color: var(--primary-hover);
    }

    /* 资讯与友情链接 */
    .links-tags-panel {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      margin-bottom: 24px;
    }

    .links-tags-panel h4 {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-dark);
    }

    .seo-links-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      list-style: none;
    }

    .seo-links-flex a {
      font-size: 13.5px;
      background: var(--bg-alt);
      padding: 6px 12px;
      border-radius: 6px;
      color: var(--primary-hover);
      border: 1px solid var(--border-color);
    }
    .seo-links-flex a:hover {
      background: var(--primary-color);
      color: #ffffff;
    }

    /* 页脚 */
    footer.site-footer {
      background-color: #064e3b;
      color: #ecfdf5;
      padding: 48px 0 24px 0;
      border-top: 1px solid #047857;
    }

    .footer-top-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 36px;
    }

    .footer-col h5 {
      font-size: 16px;
      font-weight: 700;
      color: #ffffff;
      margin-bottom: 16px;
    }

    .footer-col p {
      font-size: 13.5px;
      color: #a7f3d0;
      line-height: 1.6;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer-links-list a {
      color: #d1fae5;
      font-size: 13.5px;
    }
    .footer-links-list a:hover {
      color: #ffffff;
      text-decoration: underline;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.1);
      padding-top: 20px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 13px;
      color: #a7f3d0;
    }

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

    /* 浮动工具栏 */
    .floating-toolbar {
      position: fixed;
      bottom: 30px;
      right: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 46px;
      height: 46px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      transition: var(--transition);
    }
    .float-btn:hover {
      background: var(--primary-color);
      color: #ffffff;
      transform: translateY(-2px);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-highlights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .service-cards-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .media-showcase-grid {
        grid-template-columns: 1fr;
      }
      .footer-top-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        display: none;
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
        border-bottom: 1px solid #f3f4f6;
      }
      h1.hero-title {
        font-size: 28px;
      }
      .hero-subtitle {
        font-size: 15px;
      }
      .service-cards-grid {
        grid-template-columns: 1fr;
      }
      .process-timeline {
        grid-template-columns: 1fr;
      }
      .testimonials-grid {
        grid-template-columns: 1fr;
      }
      .about-grid, .contact-grid {
        grid-template-columns: 1fr;
      }
      .footer-top-grid {
        grid-template-columns: 1fr;
      }
      .eval-score-card {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
      .eval-score-val {
        text-align: center;
      }
    }