:root {
      --primary: #0284c7;
      --primary-hover: #0369a1;
      --accent: #f97316;
      --bg-main: #f8fafc;
      --surface: #ffffff;
      --surface-sub: #f1f5f9;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --border-focus: #38bdf8;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
      --radius: 12px;
      --max-w: 1240px;
      --transition: all 0.25s ease-in-out;
    }

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

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

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

    ul, ol {
      list-style: none;
    }

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

    /* 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);
    }

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

    .brand-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .ai-page-logo {
      height: 42px;
      width: auto;
      display: block;
    }

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

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-item {
      display: block;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: 6px;
    }

    .nav-item:hover, .ai-page-home-link:hover {
      color: var(--primary);
      background-color: #f0f9ff;
    }

    .ai-page-home-link {
      display: block;
      font-size: 0.92rem;
      font-weight: 500;
      color: var(--primary);
      padding: 8px 12px;
    }

    .nav-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: 0.95rem;
      font-weight: 600;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 10px rgba(2, 132, 199, 0.25);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      box-shadow: 0 6px 14px rgba(2, 132, 199, 0.35);
      transform: translateY(-1px);
    }

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

    .btn-outline:hover {
      background-color: var(--surface-sub);
      border-color: #cbd5e1;
    }

    .btn-accent {
      background-color: var(--accent);
      color: #ffffff;
    }

    .btn-accent:hover {
      background-color: #ea580c;
    }

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

    /* 模块通用标题与排版 */
    section {
      padding: 72px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 48px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 12px;
      background-color: #e0f2fe;
      color: var(--primary);
      font-size: 0.82rem;
      font-weight: 600;
      border-radius: 999px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* 首屏 Hero */
    .hero-section {
      padding: 90px 0 70px;
      background: linear-gradient(180deg, #ffffff 0%, #f0f9ff 50%, #f8fafc 100%);
      text-align: center;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-content {
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background-color: #ffffff;
      border: 1px solid #bae6fd;
      border-radius: 999px;
      font-size: 0.88rem;
      color: var(--primary);
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: #10b981;
      box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title-highlight {
      color: var(--primary);
      position: relative;
      display: inline-block;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.7;
    }

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

    .btn-hero-main {
      padding: 14px 34px;
      font-size: 1.05rem;
      border-radius: 10px;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 28px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .metric-card {
      text-align: center;
      padding: 8px;
    }

    .metric-num {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台介绍 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .about-card-box {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .about-feature-item {
      display: flex;
      gap: 16px;
      margin-bottom: 24px;
    }

    .about-feature-item:last-child {
      margin-bottom: 0;
    }

    .feature-icon-badge {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: #e0f2fe;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
      flex-shrink: 0;
    }

    .feature-text-h3 {
      font-size: 1.1rem;
      font-weight: 600;
      margin-bottom: 4px;
      color: var(--text-main);
    }

    .feature-text-p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 模型矩阵与卡片网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .service-badge {
      align-self: flex-start;
      font-size: 0.78rem;
      padding: 3px 8px;
      background: #f1f5f9;
      color: var(--text-muted);
      border-radius: 4px;
      margin-bottom: 12px;
      font-weight: 600;
    }

    .service-title {
      font-size: 1.2rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .service-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
    }

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

    /* 模型标签云 */
    .model-pills-wrap {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      margin-top: 36px;
      box-shadow: var(--shadow-sm);
    }

    .model-pills-title {
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 16px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .model-pills-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .model-pill {
      padding: 6px 14px;
      background-color: var(--surface-sub);
      border: 1px solid #cbd5e1;
      border-radius: 6px;
      font-size: 0.85rem;
      color: var(--text-main);
      font-weight: 500;
      transition: var(--transition);
    }

    .model-pill:hover {
      background-color: #e0f2fe;
      color: var(--primary);
      border-color: #7dd3fc;
    }

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

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

    .flow-number {
      font-size: 2.4rem;
      font-weight: 800;
      color: #e0f2fe;
      line-height: 1;
      margin-bottom: 12px;
    }

    .flow-title {
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .flow-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 对比评测表格 */
    .compare-container {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .compare-rating-box {
      background: linear-gradient(90deg, #0284c7 0%, #0369a1 100%);
      color: #ffffff;
      padding: 24px 32px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 16px;
    }

    .rating-badge {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .rating-stars {
      color: #facc15;
      font-size: 1.3rem;
      letter-spacing: 2px;
    }

    .rating-score {
      font-size: 1.8rem;
      font-weight: 800;
      color: #ffffff;
    }

    .table-scroll {
      overflow-x: auto;
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }

    .compare-table th {
      background: var(--surface-sub);
      font-weight: 600;
      color: var(--text-main);
    }

    .compare-table tr:hover td {
      background-color: #f8fafc;
    }

    .highlight-cell {
      background-color: #f0f9ff;
      color: var(--primary);
      font-weight: 600;
    }

    /* 素材案例展示区 */
    .media-showcase-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      align-items: stretch;
    }

    .media-item-box {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .media-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background-color: #e2e8f0;
      overflow: hidden;
    }

    .media-img-wrap.square-ratio {
      aspect-ratio: 1 / 1;
    }

    .media-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

    .media-item-box:hover .media-img-wrap img {
      transform: scale(1.03);
    }

    .media-info {
      padding: 20px;
      flex: 1;
    }

    .media-info-title {
      font-size: 1.05rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .media-info-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

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

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

    .review-text {
      font-size: 0.94rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
      font-style: normal;
    }

    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 16px;
    }

    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #e0f2fe;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .reviewer-name {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .reviewer-role {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

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

    .faq-item {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      width: 100%;
      text-align: left;
      background: none;
      border: none;
      padding: 18px 24px;
      font-size: 1.02rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #fafafa;
    }

    .faq-answer-inner {
      padding: 0 24px 20px;
      font-size: 0.93rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 文章列表 */
    .articles-block {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .articles-links-flex {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 20px;
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
    }

    .article-direct-link {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 8px 14px;
      background: var(--surface-sub);
      border-radius: 6px;
      font-size: 0.88rem;
      color: var(--primary);
      font-weight: 500;
    }

    .article-direct-link:hover {
      background: #e0f2fe;
    }

    /* 需求匹配表单与联系我们 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
      align-items: flex-start;
    }

    .contact-info-panel {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .contact-method-group {
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 24px;
    }

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

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

    .qr-container {
      margin-top: 24px;
      padding: 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      display: inline-block;
      text-align: center;
      background: #fafafa;
    }

    .qr-container img {
      width: 140px;
      height: 140px;
      object-fit: contain;
      display: block;
      margin: 0 auto 8px;
    }

    .qr-label {
      font-size: 0.82rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    .form-box {
      background: var(--surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px;
      box-shadow: var(--shadow-sm);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-label {
      display: block;
      font-size: 0.92rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 0.92rem;
      color: var(--text-main);
      background-color: #ffffff;
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.15);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* 友情链接与页脚 */
    .friendly-links-section {
      padding: 36px 0;
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .friendly-links-wrap {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
    }

    .friendly-links-title {
      font-size: 0.92rem;
      font-weight: 600;
      color: var(--text-main);
    }

    .friendly-links-wrap a {
      font-size: 0.88rem;
      color: var(--text-muted);
      padding: 4px 10px;
      background: var(--surface-sub);
      border-radius: 4px;
    }

    .friendly-links-wrap a:hover {
      color: var(--primary);
      background: #e0f2fe;
    }

    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 48px 0 32px;
    }

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

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

    .footer-links-list li {
      margin-bottom: 8px;
    }

    .footer-links-list a {
      font-size: 0.88rem;
      color: #94a3b8;
    }

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

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.85rem;
    }

    /* 浮动操作条与返回顶部 */
    .float-dock {
      position: fixed;
      right: 20px;
      bottom: 24px;
      z-index: 99;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .dock-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;
      color: var(--text-main);
      cursor: pointer;
      transition: var(--transition);
      font-size: 1.2rem;
    }

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

    /* 响应式样式适配 */
    @media (max-width: 1024px) {
      .services-grid, .media-showcase-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 2rem;
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-grid, .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .services-grid, .media-showcase-grid, .reviews-grid, .flow-steps {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-item, .ai-page-home-link {
        width: 100%;
        padding: 10px 0;
      }
      .menu-toggle {
        display: block;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }