:root {
      --primary: #7c3aed;
      --primary-dark: #5b21b6;
      --primary-light: #9333ea;
      --primary-soft: #f3e8ff;
      --accent: #c026d3;
      --accent-glow: rgba(192, 38, 211, 0.25);
      --bg-page: #faf5ff;
      --bg-surface: #ffffff;
      --text-main: #111827;
      --text-muted: #4b5563;
      --text-light: #6b7280;
      --border-color: #e9d5ff;
      --shadow-sm: 0 4px 12px rgba(124, 58, 237, 0.05);
      --shadow-md: 0 10px 25px rgba(124, 58, 237, 0.1);
      --shadow-lg: 0 20px 40px rgba(124, 58, 237, 0.15);
      --radius: 12px;
      --container-width: 1200px;
    }

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

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

    body {
      background: radial-gradient(circle at 50% 0%, #f3e8ff 0%, #faf5ff 40%, #f5f3ff 100%);
      min-height: 100vh;
      display: flex;
      flex-direction: column;
    }

    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部 Header & 导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(124, 58, 237, 0.05);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

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

    .brand-name {
      font-size: 20px;
      font-weight: 800;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

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

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s ease, background 0.2s ease;
      border-radius: 6px;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 15px;
      font-weight: 700;
      border-radius: 30px;
      text-decoration: none;
      transition: all 0.25s ease;
      cursor: pointer;
      border: none;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(124, 58, 237, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(192, 38, 211, 0.4);
    }

    .btn-outline {
      border: 2px solid var(--primary);
      color: var(--primary);
      background: transparent;
    }

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

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--primary-dark);
      cursor: pointer;
    }

    /* 模块通用样式 */
    section.section-block {
      padding: 70px 0;
      border-bottom: 1px solid rgba(233, 213, 255, 0.5);
    }

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

    .section-tag {
      display: inline-block;
      padding: 4px 16px;
      background: var(--primary-soft);
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      border-radius: 20px;
      margin-bottom: 12px;
      letter-spacing: 1px;
    }

    .section-h2 {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* 1. Hero 首屏 - 严格无图片 */
    .hero-section {
      padding: 90px 0 70px 0;
      background: linear-gradient(180deg, #f3e8ff 0%, #faf5ff 100%);
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-bg-glow {
      position: absolute;
      top: -20%;
      left: 50%;
      transform: translateX(-50%);
      width: 600px;
      height: 600px;
      background: radial-gradient(circle, rgba(192, 38, 211, 0.15) 0%, rgba(124, 58, 237, 0) 70%);
      pointer-events: none;
    }

    .hero-content {
      position: relative;
      z-index: 2;
      max-width: 900px;
      margin: 0 auto;
    }

    h1.hero-h1 {
      font-size: 38px;
      font-weight: 900;
      line-height: 1.3;
      margin-bottom: 20px;
      background: linear-gradient(135deg, #4c1d95 0%, #7c3aed 50%, #c026d3 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-sub {
      font-size: 18px;
      color: var(--text-muted);
      margin-bottom: 35px;
      line-height: 1.7;
    }

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

    .hero-badges {
      display: flex;
      justify-content: center;
      gap: 20px;
      flex-wrap: wrap;
    }

    .hero-badge-item {
      display: flex;
      align-items: center;
      gap: 8px;
      background: rgba(255, 255, 255, 0.8);
      padding: 8px 18px;
      border-radius: 30px;
      border: 1px solid var(--border-color);
      font-size: 14px;
      font-weight: 600;
      color: var(--primary-dark);
    }

    /* 2. 数据指标卡片 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: -30px;
      position: relative;
      z-index: 10;
    }

    .metric-card {
      background: var(--bg-surface);
      padding: 28px 20px;
      border-radius: var(--radius);
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
      text-align: center;
      transition: transform 0.3s ease;
    }

    .metric-card:hover {
      transform: translateY(-5px);
    }

    .metric-val {
      font-size: 34px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
    }

    .metric-lbl {
      font-size: 14px;
      color: var(--text-light);
    }

    /* 卡片网格布局 */
    .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;
    }

    .card-item {
      background: var(--bg-surface);
      border-radius: var(--radius);
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

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

    .card-icon-title {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .icon-badge {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      background: var(--primary-soft);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 18px;
      flex-shrink: 0;
    }

    .card-h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
    }

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

    /* 模型标签云 */
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 20px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary-dark);
      box-shadow: 0 2px 6px rgba(124, 58, 237, 0.04);
      transition: all 0.2s ease;
    }

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

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

    .step-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      padding: 24px;
      border-radius: var(--radius);
      position: relative;
    }

    .step-num {
      position: absolute;
      top: 15px;
      right: 15px;
      font-size: 32px;
      font-weight: 900;
      color: var(--primary-soft);
    }

    /* 对比表格 */
    .table-responsive {
      width: 100%;
      overflow-x: auto;
      background: var(--bg-surface);
      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;
      min-width: 650px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    .compare-table th {
      background: var(--primary-soft);
      color: var(--primary-dark);
      font-weight: 700;
    }

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

    .highlight-cell {
      background: rgba(243, 232, 255, 0.4);
      font-weight: 700;
      color: var(--primary-dark);
    }

    .rating-banner {
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 24px;
      flex-wrap: wrap;
      gap: 16px;
    }

    .rating-score {
      font-size: 42px;
      font-weight: 900;
    }

    /* 案例图片展示 */
    .case-card {
      background: var(--bg-surface);
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .case-img-holder {
      width: 100%;
      overflow: hidden;
      background: #f0f0f0;
    }

    .ai-page-image {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }

    .case-card:hover .ai-page-image {
      transform: scale(1.03);
    }

    .case-info {
      padding: 20px;
    }

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
    }

    .faq-question {
      width: 100%;
      padding: 18px 22px;
      text-align: left;
      background: none;
      border: none;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }

    .faq-arrow {
      transition: transform 0.3s ease;
      color: var(--primary);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 22px;
      color: var(--text-muted);
      font-size: 14px;
      background: #faf7ff;
    }

    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 16px 22px;
      border-top: 1px solid var(--border-color);
    }

    /* 评论卡片 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: var(--bg-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;
    }

    .user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 16px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-soft);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
    }

    /* 表单与联系方式 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }

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

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

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 14px;
      background: #faf7ff;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      background: #ffffff;
    }

    .contact-info-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 32px;
    }

    .qr-box {
      display: flex;
      align-items: center;
      gap: 20px;
      margin-top: 20px;
      padding: 16px;
      background: var(--primary-soft);
      border-radius: 10px;
    }

    .qr-box img {
      width: 100px;
      height: 100px;
      border-radius: 6px;
    }

    /* 文章与友情链接 */
    .article-links, .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      list-style: none;
    }

    .article-links a, .friend-links a {
      display: inline-block;
      padding: 8px 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 20px;
      font-size: 13px;
      color: var(--text-muted);
      text-decoration: none;
      transition: all 0.2s ease;
    }

    .article-links a:hover, .friend-links a:hover {
      color: var(--primary);
      border-color: var(--primary);
      background: var(--primary-soft);
    }

    /* 页脚 */
    footer.site-footer {
      background: #111827;
      color: #d1d5db;
      padding: 60px 0 30px 0;
      margin-top: auto;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 16px;
      margin-bottom: 16px;
    }

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

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

    .footer-links a {
      color: #9ca3af;
      text-decoration: none;
      font-size: 14px;
      transition: color 0.2s;
    }

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

    .footer-bottom {
      border-top: 1px solid #1f2937;
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
      color: #6b7280;
    }

    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
      color: #ffffff;
      padding: 12px 20px;
      border-radius: 30px;
      box-shadow: 0 6px 20px rgba(124, 58, 237, 0.4);
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      font-weight: 700;
      font-size: 14px;
      transition: transform 0.2s ease;
    }

    .float-kefu:hover {
      transform: translateY(-3px);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .grid-4, .process-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-toggle {
        display: block;
      }
      nav.main-nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
        box-shadow: var(--shadow-md);
      }
      nav.main-nav.active {
        display: block;
      }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        width: 100%;
        padding: 10px 0;
      }
      h1.hero-h1 {
        font-size: 26px;
      }
      .grid-3, .grid-4, .reviews-grid, .metrics-grid, .process-steps {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
    }