:root {
      --primary: #00B553;
      --primary-hover: #009645;
      --primary-light: #EBFBF2;
      --primary-border: #99EBB8;
      --accent: #10B981;
      --text-main: #1F2937;
      --text-muted: #4B5563;
      --text-light: #6B7280;
      --bg-page: #F8FAF9;
      --bg-card: #FFFFFF;
      --border-color: #E5E7EB;
      --shadow-sm: 0 2px 8px rgba(0, 181, 83, 0.06);
      --shadow-md: 0 8px 24px rgba(0, 181, 83, 0.1);
      --shadow-lg: 0 16px 36px rgba(0, 0, 0, 0.06);
      --radius: 12px;
      --radius-sm: 8px;
      --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-page);
      color: var(--text-main);
      line-height: 1.65;
      overflow-x: hidden;
      min-width: 320px;
    }

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

    .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, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

    .brand-area {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }

    .brand-area .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
      display: block;
    }

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

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

    .nav-links li a {
      display: block;
      padding: 10px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }

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

    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
      flex-shrink: 0;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      border: 1px solid transparent;
      cursor: pointer;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(0, 181, 83, 0.35);
    }

    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(0, 181, 83, 0.45);
      color: #FFFFFF;
    }

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

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

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    /* 首屏 Hero - 严格无图纯CSS质感 */
    .hero-section {
      position: relative;
      padding: 70px 0 60px;
      background: radial-gradient(circle at 10% 20%, #E8F9EE 0%, #F8FAF9 65%);
      border-bottom: 1px solid #E3EBE6;
      overflow: hidden;
    }

    .hero-content {
      text-align: center;
      max-width: 880px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      border-radius: 999px;
      background: #FFFFFF;
      border: 1px solid var(--primary-border);
      color: var(--primary);
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 22px;
      box-shadow: var(--shadow-sm);
    }

    .hero-title {
      font-size: 2.7rem;
      line-height: 1.25;
      font-weight: 800;
      color: #111827;
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }

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

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 34px;
      max-width: 760px;
      margin-left: auto;
      margin-right: auto;
    }

    .hero-btns {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 45px;
    }

    .btn-hero-primary {
      padding: 13px 34px;
      font-size: 1.05rem;
      background: #00B553;
      color: #FFFFFF;
      border-radius: 10px;
      font-weight: 700;
    }

    .btn-hero-portal {
      padding: 13px 30px;
      font-size: 1.05rem;
      background: #111827;
      color: #FFFFFF;
      border-radius: 10px;
      font-weight: 600;
    }

    .btn-hero-portal:hover {
      background: #374151;
      transform: translateY(-2px);
      color: #FFFFFF;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
      margin-top: 10px;
    }

    .metric-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px 16px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

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

    .metric-value {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
      margin-bottom: 8px;
    }

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

    /* 模块通用样式 */
    .section {
      padding: 70px 0;
      position: relative;
    }

    .section-alt {
      background-color: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }

    .section-head {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 45px;
    }

    .section-tag {
      display: inline-block;
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 12px;
      border-radius: 20px;
      margin-bottom: 10px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: #111827;
      line-height: 1.35;
      margin-bottom: 12px;
    }

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

    /* 平台矩阵标签条 */
    .model-tags-bar {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 25px;
    }

    .model-tag {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      padding: 6px 14px;
      font-size: 0.85rem;
      color: var(--text-main);
      font-weight: 500;
      box-shadow: 0 1px 3px rgba(0,0,0,0.03);
    }

    .model-tag.highlight {
      border-color: var(--primary);
      color: var(--primary);
      background: var(--primary-light);
    }

    /* 网格布局 */
    .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;
    }

    /* 服务场景卡片 */
    .feature-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 26px 22px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      height: 100%;
    }

    .feature-card:hover {
      border-color: var(--primary);
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
    }

    .card-icon-badge {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      color: #111827;
      margin-bottom: 10px;
    }

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

    .card-meta-line {
      margin-top: 16px;
      padding-top: 12px;
      border-top: 1px dashed var(--border-color);
      font-size: 0.82rem;
      color: var(--primary);
      font-weight: 600;
    }

    /* 图文图示包装 */
    .media-box {
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      background: #FFFFFF;
    }

    .media-box img {
      width: 100%;
      height: auto;
      display: block;
      object-fit: cover;
    }

    .media-caption {
      padding: 12px 16px;
      font-size: 0.85rem;
      color: var(--text-muted);
      background: #FAFDFB;
      border-top: 1px solid #EBF0ED;
      font-weight: 500;
    }

    /* 流程与步骤 */
    .step-item {
      position: relative;
      background: #FFFFFF;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      text-align: center;
    }

    .step-num {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary);
      color: #FFFFFF;
      font-size: 1.1rem;
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
    }

    .step-item h4 {
      font-size: 1.1rem;
      color: #111827;
      margin-bottom: 8px;
    }

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

    /* 对比评测卡片与表格 */
    .review-highlight {
      background: linear-gradient(135deg, #059669 0%, #00B553 100%);
      color: #FFFFFF;
      padding: 30px;
      border-radius: var(--radius);
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .review-score-box {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .review-big-score {
      font-size: 3.4rem;
      font-weight: 900;
      line-height: 1;
    }

    .review-stars {
      color: #FCD34D;
      font-size: 1.4rem;
      margin-top: 4px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #FFFFFF;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      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-color);
    }

    .compare-table th {
      background: #F9FAFB;
      font-weight: 700;
      color: #374151;
    }

    .compare-table td.brand-col {
      font-weight: 700;
      color: var(--primary);
      background: #F0FDF4;
    }

    .badge-check {
      display: inline-block;
      color: var(--primary);
      font-weight: bold;
    }

    /* 用户评论 */
    .review-card {
      background: #FFFFFF;
      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-author {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 18px;
      padding-top: 14px;
      border-top: 1px solid var(--border-color);
    }

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

    .author-info h4 {
      font-size: 0.95rem;
      color: #111827;
      margin-bottom: 2px;
    }

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

    /* 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-sm);
      overflow: hidden;
      transition: var(--transition);
    }

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

    .faq-question {
      width: 100%;
      text-align: left;
      padding: 18px 22px;
      background: none;
      border: none;
      font-size: 1.02rem;
      font-weight: 600;
      color: #111827;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

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

    .faq-answer {
      display: none;
      padding: 0 22px 18px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

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

    /* 需求表单模块 */
    .form-wrapper {
      max-width: 760px;
      margin: 0 auto;
      background: #FFFFFF;
      padding: 36px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: #374151;
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #FFFFFF;
      color: var(--text-main);
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(0, 181, 83, 0.15);
    }

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

    /* 底部通用规范 */
    .site-footer {
      background: #111827;
      color: #D1D5DB;
      padding: 60px 0 30px;
      border-top: 3px solid var(--primary);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.2fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      font-size: 1.05rem;
      color: #FFFFFF;
      margin-bottom: 18px;
      position: relative;
      padding-bottom: 8px;
    }

    .footer-col h4::after {
      content: "";
      position: absolute;
      left: 0;
      bottom: 0;
      width: 30px;
      height: 2px;
      background: var(--primary);
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links li a {
      color: #9CA3AF;
      font-size: 0.88rem;
    }

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

    .footer-qr-card {
      display: inline-flex;
      flex-direction: column;
      align-items: center;
      background: #1F2937;
      padding: 12px;
      border-radius: var(--radius-sm);
      border: 1px solid #374151;
    }

    .footer-qr-card img {
      width: 105px;
      height: 105px;
      object-fit: cover;
      border-radius: 4px;
      display: block;
    }

    .footer-qr-card span {
      font-size: 0.78rem;
      color: #D1D5DB;
      margin-top: 8px;
    }

    .friendly-links-wrap {
      padding-top: 24px;
      border-top: 1px solid #374151;
      margin-bottom: 30px;
      font-size: 0.85rem;
      color: #9CA3AF;
    }

    .friendly-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 10px;
    }

    .friendly-links-list a {
      color: #9CA3AF;
      background: #1F2937;
      padding: 4px 10px;
      border-radius: 4px;
    }

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

    .footer-bottom {
      text-align: center;
      padding-top: 20px;
      border-top: 1px solid #1F2937;
      font-size: 0.82rem;
      color: #6B7280;
    }

    /* 浮动工具栏 */
    .float-dock {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      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: 0 4px 12px rgba(0,0,0,0.12);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-main);
      font-size: 1.1rem;
      cursor: pointer;
      position: relative;
      transition: var(--transition);
    }

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

    .dock-popover {
      display: none;
      position: absolute;
      right: 56px;
      bottom: 0;
      background: #FFFFFF;
      padding: 14px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      width: 160px;
      text-align: center;
    }

    .dock-popover img {
      width: 130px;
      height: 130px;
      display: block;
      margin: 0 auto 8px;
      object-fit: cover;
    }

    .dock-popover p {
      font-size: 0.8rem;
      color: var(--text-main);
      margin: 0;
    }

    .dock-btn:hover .dock-popover {
      display: block;
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-2 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-title {
        font-size: 2.1rem;
      }
      .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        padding: 12px 10px;
        border-bottom: 1px solid #F3F4F6;
      }
      .header-actions .btn-outline {
        display: none;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .form-wrapper {
        padding: 24px 18px;
      }
      .review-highlight {
        flex-direction: column;
        align-items: flex-start;
      }
    }