:root {
      --primary: #581c87;
      --primary-accent: #7c3aed;
      --vibrant-pink: #ec4899;
      --vibrant-amber: #f59e0b;
      --vibrant-cyan: #06b6d4;
      --text-dark: #1e1b4b;
      --text-muted: #4b5563;
      --bg-light: #faf5ff;
      --bg-card: #ffffff;
      --border-color: #ede9fe;
      --shadow-sm: 0 4px 6px -1px rgba(124, 58, 237, 0.05);
      --shadow-lg: 0 10px 25px -5px rgba(124, 58, 237, 0.12);
      --shadow-hover: 0 18px 30px -5px rgba(236, 72, 153, 0.18);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background: linear-gradient(180deg, #fdf4ff 0%, #faf5ff 30%, #f5f3ff 70%, #fdf2f8 100%);
      color: var(--text-dark);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    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: var(--shadow-sm);
    }

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

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

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

    .brand-name {
      font-size: 1.25rem;
      font-weight: 800;
      background: linear-gradient(90deg, #7c3aed, #ec4899);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-dark);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      transition: all 0.25s ease;
    }

    .nav-links li a:hover {
      color: var(--vibrant-pink);
      background: #fdf2f8;
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 700;
      border-radius: 9999px;
      cursor: pointer;
      transition: all 0.3s ease;
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-vibrant {
      background: linear-gradient(135deg, #7c3aed 0%, #ec4899 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(236, 72, 153, 0.35);
    }

    .btn-vibrant:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(236, 72, 153, 0.45);
    }

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

    .btn-secondary:hover {
      background: #f5f3ff;
      border-color: var(--primary-accent);
    }

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

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

    .section-head {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 50px;
    }

    .section-badge {
      display: inline-block;
      padding: 6px 16px;
      background: linear-gradient(90deg, #f3e8ff, #fce7f3);
      color: #7c3aed;
      font-size: 0.85rem;
      font-weight: 700;
      border-radius: 9999px;
      margin-bottom: 14px;
      border: 1px solid #e9d5ff;
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-dark);
      line-height: 1.3;
      margin-bottom: 16px;
    }

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

    /* Hero 首屏 (无图片) */
    .hero-section {
      padding: 80px 0 60px;
      text-align: center;
      position: relative;
    }

    .hero-h1 {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1.25;
      margin-bottom: 22px;
      color: var(--text-dark);
    }

    .hero-h1 span {
      background: linear-gradient(135deg, #7c3aed 0%, #ec4899 50%, #f59e0b 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: var(--text-muted);
      max-width: 780px;
      margin: 0 auto 36px;
      font-weight: 500;
    }

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

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

    .stat-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #d8b4fe;
    }

    .stat-num {
      font-size: 2rem;
      font-weight: 900;
      color: var(--primary-accent);
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 600;
    }

    /* 平台矩阵滚动标签 */
    .models-chip-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-chip {
      background: #ffffff;
      border: 1px solid #e9d5ff;
      padding: 6px 14px;
      border-radius: 9999px;
      font-size: 0.85rem;
      font-weight: 600;
      color: #6b21a8;
      box-shadow: 0 2px 4px rgba(0,0,0,0.02);
      transition: all 0.2s ease;
    }

    .model-chip:hover {
      background: #7c3aed;
      color: #ffffff;
      border-color: #7c3aed;
    }

    /* 基础卡片网格 */
    .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: 28px;
    }

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

    .card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-hover);
      border-color: #f472b6;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: linear-gradient(135deg, #f3e8ff, #fce7f3);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 20px;
      color: var(--primary-accent);
    }

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

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

    /* 场景分类标签与卡片 */
    .feature-tag {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      color: #db2777;
      background: #fdf2f8;
      padding: 3px 8px;
      border-radius: 4px;
      margin-bottom: 10px;
    }

    /* 对比表格 */
    .table-wrapper {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .comp-table th, .comp-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .comp-table th {
      background: #fdf4ff;
      color: var(--primary);
      font-weight: 700;
    }

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

    .comp-table .highlight {
      background: #faf5ff;
      font-weight: 700;
      color: #7c3aed;
    }

    .score-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: linear-gradient(135deg, #fef3c7, #fde68a);
      color: #92400e;
      padding: 4px 12px;
      border-radius: 9999px;
      font-weight: 800;
      font-size: 0.9rem;
    }

    /* 流程步骤 */
    .step-box {
      position: relative;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      font-size: 1.8rem;
      font-weight: 900;
      color: #ec4899;
      margin-bottom: 10px;
      opacity: 0.85;
    }

    /* 媒体与图文 */
    .img-container {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .img-container img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.4s ease;
    }

    .img-container:hover img {
      transform: scale(1.03);
    }

    /* 评论卡片 */
    .review-card {
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-stars {
      color: #f59e0b;
      margin-bottom: 12px;
      font-size: 1rem;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 18px;
      padding-top: 14px;
      border-top: 1px solid #f3e8ff;
    }

    .user-avatar-circle {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, #7c3aed, #ec4899);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }

    .user-meta h4 {
      font-size: 0.95rem;
      color: var(--text-dark);
    }

    .user-meta p {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      overflow: hidden;
      transition: all 0.3s ease;
    }

    .faq-question {
      padding: 18px 22px;
      font-weight: 700;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      color: var(--text-dark);
      user-select: none;
    }

    .faq-question:hover {
      color: var(--primary-accent);
      background: #faf5ff;
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
      color: var(--primary-accent);
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #ffffff;
      color: var(--text-muted);
      font-size: 0.95rem;
      padding: 0 22px;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 22px 18px 22px;
    }

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

    /* 需求表单 */
    .form-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 36px;
      box-shadow: var(--shadow-lg);
    }

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

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-dark);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border-radius: var(--radius-sm);
      border: 1px solid #d8b4fe;
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s ease;
      background: #faf5ff;
      color: var(--text-dark);
    }

    .form-control:focus {
      border-color: var(--primary-accent);
      background: #ffffff;
    }

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

    /* 文章列表与外链 */
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
      gap: 14px;
    }

    .article-link-item {
      background: #ffffff;
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      font-size: 0.9rem;
      font-weight: 600;
      color: #6b21a8;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.2s ease;
    }

    .article-link-item:hover {
      background: #f3e8ff;
      color: #7c3aed;
      border-color: #c084fc;
    }

    /* 页脚 */
    footer.site-footer {
      background: #1e1b4b;
      color: #f5f3ff;
      padding: 60px 0 30px;
      margin-top: 50px;
    }

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

    .footer-brand h3 {
      font-size: 1.4rem;
      color: #ffffff;
      margin-bottom: 12px;
    }

    .footer-brand p {
      color: #c7d2fe;
      font-size: 0.9rem;
      line-height: 1.6;
    }

    .footer-col h4 {
      font-size: 1.05rem;
      color: #ffffff;
      margin-bottom: 16px;
    }

    .footer-col ul {
      list-style: none;
    }

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

    .footer-col ul li a {
      color: #c7d2fe;
      font-size: 0.9rem;
      transition: color 0.2s ease;
    }

    .footer-col ul li a:hover {
      color: #f472b6;
    }

    .friend-links-box {
      border-top: 1px solid #312e81;
      padding: 24px 0;
      margin-bottom: 24px;
    }

    .friend-links-title {
      font-size: 0.95rem;
      color: #e0e7ff;
      margin-bottom: 12px;
      font-weight: 700;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friend-links-list a {
      color: #a5b4fc;
      font-size: 0.85rem;
      transition: color 0.2s ease;
    }

    .friend-links-list a:hover {
      color: #ffffff;
      text-decoration: underline;
    }

    .footer-bottom {
      text-align: center;
      border-top: 1px solid #312e81;
      padding-top: 24px;
      color: #a5b4fc;
      font-size: 0.85rem;
    }

    /* 浮动客服 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: linear-gradient(135deg, #7c3aed, #ec4899);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.2);
      cursor: pointer;
      position: relative;
      border: none;
    }

    .float-qr-modal {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      width: 150px;
      text-align: center;
    }

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

    .float-btn:hover .float-qr-modal {
      display: block;
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .grid-4, .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .hero-h1 {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.7rem;
      }
      .grid-3, .grid-2, .footer-grid {
        grid-template-columns: 1fr;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-lg);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-actions .btn {
        display: none;
      }
    }