:root {
      --primary: #059669;
      --primary-light: #10b981;
      --primary-dark: #047857;
      --primary-bg: #ecfdf5;
      --accent: #0284c7;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-body: #f8fafc;
      --bg-surface: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -2px rgba(0,0,0,0.04);
      --shadow-lg: 0 10px 15px -3px rgba(5,150,105,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --container-max: 1200px;
    }

    * {
      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, "Noto Sans", sans-serif;
      background-color: var(--bg-body);
      color: var(--text-main);
      line-height: 1.6;
      background-image: 
        radial-gradient(at 0% 0%, rgba(16, 185, 129, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(2, 132, 199, 0.05) 0px, transparent 50%);
      background-attachment: fixed;
    }

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

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      transition: all 0.3s ease;
    }

    .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;
      object-fit: contain;
    }

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

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

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
      font-weight: 600;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s ease;
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-light), var(--primary));
      color: #ffffff;
      box-shadow: 0 4px 10px rgba(5, 150, 105, 0.25);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 14px rgba(5, 150, 105, 0.35);
      color: #ffffff;
    }

    .btn-outline {
      background: #ffffff;
      color: var(--primary-dark);
      border-color: #a7f3d0;
    }

    .btn-outline:hover {
      background: var(--primary-bg);
      border-color: var(--primary);
      color: var(--primary);
    }

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

    /* 区域通用规范 */
    .section-wrap {
      padding: 80px 0;
    }

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px auto;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-bg);
      padding: 4px 14px;
      border-radius: 999px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
      text-transform: uppercase;
      border: 1px solid #a7f3d0;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 首屏 Hero 无图片设计 */
    .hero-section {
      padding: 100px 0 80px 0;
      position: relative;
      overflow: hidden;
      background: linear-gradient(180deg, rgba(236, 253, 245, 0.6) 0%, rgba(248, 250, 252, 0) 100%);
    }

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

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      padding: 6px 18px;
      border-radius: 999px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary-dark);
      border: 1px solid #d1fae5;
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.6rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-lead {
      font-size: 1.15rem;
      color: var(--text-muted);
      margin-bottom: 36px;
      line-height: 1.7;
      max-width: 780px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 30px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }

    .metric-item {
      text-align: center;
      border-right: 1px solid var(--border-color);
    }

    .metric-item:last-child {
      border-right: none;
    }

    .metric-number {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

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

    /* 平台介绍 */
    .about-card-wrap {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .about-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .about-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #a7f3d0;
    }

    .about-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-bg);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 20px;
      font-weight: 700;
    }

    .about-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .about-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 服务与模型能力网格 */
    .model-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-bottom: 40px;
    }

    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 6px 16px;
      border-radius: 999px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-muted);
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }

    .model-pill:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--primary-bg);
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
      border-color: #a7f3d0;
    }

    .service-badge {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary-dark);
      background: var(--primary-bg);
      padding: 3px 8px;
      border-radius: 4px;
      align-self: flex-start;
      margin-bottom: 12px;
    }

    .service-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .service-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

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

    .step-box {
      background: #ffffff;
      padding: 28px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-num {
      width: 40px;
      height: 40px;
      line-height: 40px;
      border-radius: 50%;
      background: var(--primary-bg);
      color: var(--primary);
      font-weight: 800;
      margin: 0 auto 16px auto;
      font-size: 1.1rem;
      border: 1px solid #a7f3d0;
    }

    .step-box h3 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .step-box p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比评测表格板块 */
    .eval-overview {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, #ecfdf5, #f0fdf4);
      border: 1px solid #a7f3d0;
      padding: 24px 30px;
      border-radius: var(--radius-md);
      margin-bottom: 30px;
    }

    .eval-score-box {
      display: flex;
      align-items: baseline;
      gap: 12px;
    }

    .eval-stars {
      color: #f59e0b;
      font-size: 1.3rem;
      letter-spacing: 2px;
    }

    .eval-score-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary-dark);
    }

    .eval-score-max {
      font-size: 1rem;
      color: var(--text-light);
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

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

    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }

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

    .compare-table td.highlight {
      background: rgba(236, 253, 245, 0.4);
      font-weight: 600;
      color: var(--primary-dark);
    }

    /* 案例图片展示 */
    .case-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .case-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .case-img-holder {
      width: 100%;
      height: 220px;
      background: #f1f5f9;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .case-img-holder img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-img-holder img {
      transform: scale(1.04);
    }

    .case-body {
      padding: 20px;
    }

    .case-body h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .case-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 资讯展示区 */
    .banner-showcase {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 24px;
      margin-bottom: 40px;
    }

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

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

    .article-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 16px;
    }

    .article-list li {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 1px dashed var(--border-color);
      padding-bottom: 12px;
    }

    .article-list li:last-child {
      border-bottom: none;
      padding-bottom: 0;
    }

    .article-list a {
      color: var(--text-main);
      font-size: 0.95rem;
      font-weight: 500;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .article-list a:hover {
      color: var(--primary);
    }

    .article-date {
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 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-quote {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
    }

    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-bg);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .author-name {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .author-title {
      font-size: 0.8rem;
      color: var(--text-light);
    }

    /* FAQ 折叠 */
    .faq-wrapper {
      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);
    }

    .faq-question {
      width: 100%;
      padding: 18px 24px;
      background: none;
      border: none;
      text-align: left;
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
    }

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

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

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

    .faq-answer-inner {
      padding: 0 24px 20px 24px;
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.6;
    }

    /* 需求匹配与表单 */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 800px;
      margin: 0 auto;
    }

    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .form-group.full-width {
      grid-column: span 2;
    }

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

    .form-control {
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background: #f8fafc;
      transition: all 0.25s ease;
    }

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

    /* 浮动客服入口 */
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-lg);
      cursor: pointer;
      border: none;
      font-size: 1.2rem;
      transition: all 0.25s ease;
    }

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

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 60px 0 30px 0;
      color: var(--text-muted);
    }

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

    .footer-brand h4 {
      font-size: 1.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .footer-brand p {
      font-size: 0.9rem;
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .footer-col h5 {
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

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

    .footer-links a {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .footer-links a:hover {
      color: var(--primary);
    }

    .qr-box {
      width: 120px;
      border: 1px solid var(--border-color);
      padding: 6px;
      background: #ffffff;
      border-radius: var(--radius-sm);
    }

    .friend-links {
      border-top: 1px solid var(--border-color);
      padding: 24px 0;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      font-size: 0.85rem;
    }

    .friend-links span {
      font-weight: 700;
      color: var(--text-main);
    }

    .friend-links a {
      color: var(--text-muted);
    }

    .friend-links a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      text-align: center;
      font-size: 0.85rem;
      color: var(--text-light);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title { font-size: 2.2rem; }
      .hero-metrics { grid-template-columns: repeat(2, 1fr); gap: 16px; }
      .metric-item:nth-child(2) { border-right: none; }
      .about-card-wrap, .service-grid, .reviews-grid, .case-gallery { grid-template-columns: repeat(2, 1fr); }
      .steps-container { grid-template-columns: repeat(2, 1fr); }
      .banner-showcase { grid-template-columns: 1fr; }
      .footer-grid { grid-template-columns: 1fr 1fr; }
    }

    @media (max-width: 768px) {
      .header-actions .btn-outline { display: none; }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 0;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active { display: flex; }
      .nav-links li { width: 100%; text-align: center; }
      .nav-links li a { display: block; padding: 12px; }
      .mobile-toggle { display: block; }
      .hero-title { font-size: 1.8rem; }
      .about-card-wrap, .service-grid, .reviews-grid, .case-gallery, .steps-container { grid-template-columns: 1fr; }
      .form-grid { grid-template-columns: 1fr; }
      .form-group.full-width { grid-column: span 1; }
      .footer-grid { grid-template-columns: 1fr; }
      .eval-overview { flex-direction: column; align-items: flex-start; gap: 12px; }
    }