:root {
      --primary: #059669;
      --primary-light: #10b981;
      --primary-soft: #ecfdf5;
      --primary-hover: #047857;
      --accent-mint: #34d399;
      --accent-fresh: #6ee7b7;
      --text-main: #0f172a;
      --text-muted: #334155;
      --text-sub: #64748b;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --bg-subtle: #f0fdf4;
      --border-color: #d1fae5;
      --border-light: #e2e8f0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(5, 150, 105, 0.08), 0 2px 4px -2px rgba(5, 150, 105, 0.04);
      --shadow-lg: 0 10px 15px -3px rgba(5, 150, 105, 0.1), 0 4px 6px -4px rgba(5, 150, 105, 0.05);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --radius-full: 9999px;
      --transition: all 0.25s ease-in-out;
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      background: radial-gradient(circle at top right, #e6fffa 0%, #f0fdf4 35%, #f8fafc 100%);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

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

    ul, ol {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      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, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: var(--transition);
    }

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

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

    .logo-box img.ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }

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

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

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 0.95rem;
      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);
      background-color: var(--primary-soft);
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-left: 20px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 9px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-full);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-light), var(--primary));
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(16, 185, 129, 0.25);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--primary), var(--primary-hover));
      transform: translateY(-1px);
      box-shadow: 0 6px 16px rgba(16, 185, 129, 0.35);
    }

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

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

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

    /* 首屏 Hero 区域 (无图片) */
    .hero-section {
      padding: 70px 0 60px;
      position: relative;
      overflow: hidden;
      background: linear-gradient(180deg, rgba(236, 253, 245, 0.6) 0%, rgba(248, 250, 252, 0) 100%);
    }

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

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 14px;
      background-color: #d1fae5;
      color: var(--primary-hover);
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: var(--radius-full);
      margin-bottom: 20px;
    }

    .hero-title {
      font-size: 2.5rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      color: var(--primary);
    }

    .hero-subtitle {
      font-size: 1.125rem;
      color: var(--text-muted);
      margin-bottom: 30px;
      line-height: 1.7;
    }

    .hero-btns {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-bottom: 36px;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      padding-top: 24px;
      border-top: 1px dashed var(--border-color);
    }

    .stat-item h4 {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .stat-item p {
      font-size: 0.85rem;
      color: var(--text-sub);
    }

    /* Hero 右侧纯 CSS/SVG 交互科技卡片 (无任何外部图片) */
    .hero-visual-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }

    .model-pills-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 24px;
    }

    .model-pill {
      font-size: 0.8rem;
      font-weight: 600;
      padding: 4px 10px;
      background: var(--primary-soft);
      color: var(--primary-hover);
      border-radius: var(--radius-sm);
      border: 1px solid rgba(16, 185, 129, 0.15);
    }

    .hero-preview-box {
      background: linear-gradient(135deg, #f0fdf4, #e6fffa);
      border-radius: var(--radius-md);
      padding: 20px;
      border: 1px dashed var(--accent-mint);
    }

    .preview-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 12px;
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--primary-hover);
    }

    .preview-list {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .preview-row {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: #ffffff;
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
    }

    .preview-badge {
      font-size: 0.75rem;
      color: var(--primary);
      background: var(--primary-soft);
      padding: 2px 8px;
      border-radius: var(--radius-full);
    }

    /* Section 通用样式 */
    .section-wrap {
      padding: 70px 0;
      position: relative;
    }

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

    .section-eyebrow {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
      background: var(--primary-soft);
      padding: 4px 12px;
      border-radius: var(--radius-full);
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
      letter-spacing: -0.5px;
    }

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

    /* 通用网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 30px;
      align-items: center;
    }

    /* 服务卡片 */
    .feature-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

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

    .feature-icon {
      width: 44px;
      height: 44px;
      background: var(--primary-soft);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.25rem;
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-sub);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 场景矩阵卡片 */
    .scene-card {
      background: #ffffff;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 20px;
      transition: var(--transition);
    }

    .scene-card:hover {
      border-color: var(--accent-mint);
      box-shadow: var(--shadow-sm);
    }

    .scene-header {
      display: flex;
      align-items: center;
      gap: 10px;
      margin-bottom: 8px;
    }

    .scene-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--primary-light);
    }

    .scene-card h4 {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .scene-card p {
      font-size: 0.88rem;
      color: var(--text-sub);
      line-height: 1.55;
    }

    /* 流程步骤 */
    .step-list {
      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 20px;
      text-align: center;
      position: relative;
    }

    .step-num {
      width: 36px;
      height: 36px;
      margin: 0 auto 14px;
      background: var(--primary);
      color: #ffffff;
      font-weight: 700;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1rem;
    }

    .step-item h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }

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

    /* 对比评测表格与卡片 */
    .eval-highlight {
      background: linear-gradient(135deg, #059669, #047857);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 30px;
    }

    .eval-score-box h3 {
      font-size: 1.3rem;
      margin-bottom: 6px;
      color: #ffffff;
    }

    .eval-score-box p {
      font-size: 0.95rem;
      opacity: 0.9;
      color: #ffffff;
    }

    .score-badge {
      text-align: right;
    }

    .score-badge .score-val {
      font-size: 2.8rem;
      font-weight: 800;
      line-height: 1;
      color: #a7f3d0;
    }

    .score-badge .stars {
      color: #fef08a;
      font-size: 1.2rem;
      margin-top: 4px;
    }

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

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.92rem;
    }

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

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

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

    .compare-table .highlight-col {
      background-color: #f0fdf4;
      font-weight: 600;
      color: var(--primary-hover);
    }

    /* 案例展示 */
    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

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

    .case-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: var(--transition);
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.03);
    }

    .case-content {
      padding: 20px;
    }

    .case-content h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .case-content p {
      font-size: 0.88rem;
      color: var(--text-sub);
    }

    /* 用户评论 */
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      height: 100%;
    }

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

    .avatar-initial {
      width: 40px;
      height: 40px;
      background: var(--primary-soft);
      color: var(--primary-hover);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .review-info h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

    .review-info span {
      font-size: 0.8rem;
      color: var(--text-sub);
    }

    /* FAQ 折叠面板 */
    .faq-container {
      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;
      transition: var(--transition);
    }

    .faq-item.active {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 600;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .faq-question:hover {
      color: var(--primary);
    }

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: #fafdfb;
      padding: 0 24px;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      padding: 0 24px 18px;
      max-height: 200px;
    }

    /* 需求匹配表单 & 联系 */
    .form-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      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(16, 185, 129, 0.15);
    }

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

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-info-item {
      display: flex;
      align-items: center;
      gap: 14px;
      font-size: 0.95rem;
      color: var(--text-muted);
    }

    .contact-icon-box {
      width: 38px;
      height: 38px;
      border-radius: 50%;
      background: var(--primary-soft);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 700;
    }

    .qr-card {
      background: var(--bg-subtle);
      border: 1px dashed var(--accent-mint);
      border-radius: var(--radius-md);
      padding: 20px;
      text-align: center;
      margin-top: 24px;
    }

    .qr-card img {
      max-width: 140px;
      border-radius: var(--radius-sm);
      margin: 10px auto;
      display: block;
    }

    /* 资讯列表短代码区 */
    .article-widget-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
    }

    .article-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 14px;
    }

    .article-links-list a {
      padding: 6px 14px;
      background: var(--bg-page);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
      color: var(--text-muted);
    }

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

    /* 友情链接 */
    .friend-links-box {
      padding: 20px 0;
      border-top: 1px solid var(--border-color);
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 12px;
      font-size: 0.85rem;
      color: var(--text-sub);
    }

    .friend-links-box a {
      color: var(--text-muted);
      margin-right: 8px;
    }

    .friend-links-box a:hover {
      color: var(--primary);
      text-decoration: underline;
    }

    /* 页脚 */
    .site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 50px 0 24px;
      margin-top: auto;
      border-top: 3px solid var(--primary);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #f8fafc;
      font-size: 1.05rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .footer-col ul {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-col ul li a {
      color: #94a3b8;
      font-size: 0.9rem;
    }

    .footer-col ul li a:hover {
      color: #34d399;
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

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

    .kefu-btn {
      width: 50px;
      height: 50px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(5, 150, 105, 0.4);
      cursor: pointer;
      transition: var(--transition);
      font-size: 1.25rem;
    }

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

    .kefu-qr-popup {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 14px;
      box-shadow: var(--shadow-lg);
      display: none;
      text-align: center;
      width: 160px;
    }

    .kefu-qr-popup img {
      width: 100%;
      height: auto;
      border-radius: 4px;
    }

    .kefu-qr-popup p {
      font-size: 0.75rem;
      color: var(--text-muted);
      margin-top: 6px;
    }

    .kefu-btn-wrap:hover .kefu-qr-popup {
      display: block;
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-list {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .mobile-toggle {
        display: block;
      }
      .nav-wrapper {
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        flex-direction: column;
        display: none;
        box-shadow: var(--shadow-md);
      }
      .nav-wrapper.active {
        display: flex;
      }
      .nav-links {
        flex-direction: column;
        width: 100%;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
        border-bottom: 1px solid var(--border-light);
      }
      .nav-actions {
        margin-left: 0;
        margin-top: 16px;
        width: 100%;
        flex-direction: column;
      }
      .nav-actions .btn {
        width: 100%;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-3, .grid-2, .grid-4, .step-list {
        grid-template-columns: 1fr;
      }
      .eval-highlight {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
      .score-badge {
        text-align: center;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }