/* CSS 全局变量：亮紫绚烂风（浅底主色 + 绚烂紫渐变 + 深色正文字体） */
    :root {
      --primary-color: #7b2cbf;
      --primary-hover: #6a1b9a;
      --secondary-color: #9d4edd;
      --accent-color: #c77dff;
      --accent-light: #e0aaff;
      --bright-gradient: linear-gradient(135deg, #7b2cbf 0%, #9d4edd 50%, #c77dff 100%);
      --bright-gradient-soft: linear-gradient(135deg, rgba(123, 44, 191, 0.08) 0%, rgba(199, 125, 255, 0.12) 100%);
      --bg-page: #fdfbfe;
      --bg-surface: #ffffff;
      --bg-card: rgba(255, 255, 255, 0.92);
      --text-main: #1f1b2e;
      --text-muted: #5e5873;
      --text-light: #8e88a8;
      --border-color: rgba(157, 78, 221, 0.18);
      --border-hover: rgba(123, 44, 191, 0.45);
      --shadow-sm: 0 4px 16px rgba(123, 44, 191, 0.06);
      --shadow-md: 0 10px 30px rgba(123, 44, 191, 0.1);
      --shadow-lg: 0 20px 45px rgba(123, 44, 191, 0.14);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 22px;
      --container-max: 1200px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-page);
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      color: var(--text-main);
      background-color: var(--bg-page);
      background-image: 
        radial-gradient(circle at 10% 10%, rgba(199, 125, 255, 0.12) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(123, 44, 191, 0.08) 0%, transparent 45%);
      background-attachment: fixed;
      line-height: 1.65;
      overflow-x: hidden;
    }

    /* 统一居中容器规范 */
    .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, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 15px rgba(123, 44, 191, 0.05);
      transition: all 0.3s ease;
    }

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

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

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

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

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

    .nav-item {
      display: block;
    }

    .nav-link,
    .ai-page-home-link {
      display: inline-block;
      padding: 10px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      text-decoration: none;
      transition: color 0.2s ease, transform 0.2s ease;
      white-space: nowrap;
    }

    .nav-link:hover,
    .ai-page-home-link:hover {
      color: var(--primary-color);
      transform: translateY(-1px);
    }

    .header-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: 600;
      border-radius: var(--radius-md);
      text-decoration: none;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
    }

    .btn-primary {
      background: var(--bright-gradient);
      color: #ffffff;
      box-shadow: 0 4px 15px rgba(123, 44, 191, 0.28);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(123, 44, 191, 0.38);
      color: #ffffff;
    }

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

    .btn-outline:hover {
      background: rgba(123, 44, 191, 0.08);
      color: var(--primary-hover);
    }

    .menu-toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      background: transparent;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--primary-color);
      transition: 0.3s;
    }

    /* 页面各 Section 统一基调 */
    .section-padding {
      padding-top: 80px;
      padding-bottom: 80px;
    }

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

    .section-tag {
      display: inline-block;
      padding: 6px 16px;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary-color);
      background: var(--bright-gradient-soft);
      border: 1px solid var(--border-color);
      border-radius: 30px;
      margin-bottom: 14px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 首屏 Hero（无图片，纯色/渐变/几何/动效） */
    .hero-section {
      padding-top: 90px;
      padding-bottom: 80px;
      position: relative;
      background: linear-gradient(180deg, rgba(224, 170, 255, 0.15) 0%, rgba(253, 251, 254, 0) 100%);
      border-bottom: 1px solid rgba(157, 78, 221, 0.12);
    }

    .hero-content {
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 20px;
      border-radius: 30px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--primary-color);
      box-shadow: var(--shadow-sm);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 22px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px auto;
      line-height: 1.8;
    }

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

    .btn-hero-main {
      padding: 14px 36px;
      font-size: 1.1rem;
    }

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

    .stat-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px 16px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.25s ease, border-color 0.25s ease;
    }

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

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

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

    /* 平台矩阵与模型支持 */
    .model-tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 30px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--text-main);
      padding: 8px 16px;
      border-radius: 8px;
      font-size: 0.88rem;
      font-weight: 500;
      box-shadow: 0 2px 6px rgba(0, 0, 0, 0.02);
      transition: all 0.2s ease;
    }

    .model-tag:hover {
      border-color: var(--primary-color);
      color: var(--primary-color);
      transform: translateY(-2px);
    }

    /* 卡片网格通用 */
    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

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

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

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

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

    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--bright-gradient-soft);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.35rem;
      color: var(--primary-color);
      margin-bottom: 20px;
    }

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

    .feature-desc {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.65;
      flex-grow: 1;
    }

    /* 图片与媒体包装区 */
    .media-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

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

    .media-card-img-wrap {
      width: 100%;
      background: #f0e6f7;
      overflow: hidden;
    }

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

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

    .media-card-body {
      padding: 20px;
    }

    /* 对比评测板块 */
    .eval-highlight-box {
      background: var(--bright-gradient-soft);
      border: 2px solid var(--primary-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      text-align: center;
      margin-bottom: 40px;
      box-shadow: var(--shadow-md);
    }

    .eval-score-num {
      font-size: 3.5rem;
      font-weight: 900;
      color: var(--primary-color);
      line-height: 1;
    }

    .eval-stars {
      color: #ffaa00;
      font-size: 1.4rem;
      margin: 10px 0;
    }

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

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

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

    .custom-table th {
      background: rgba(123, 44, 191, 0.05);
      color: var(--primary-color);
      font-weight: 700;
      white-space: nowrap;
    }

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

    .highlight-cell {
      color: var(--primary-color);
      font-weight: 700;
      background: rgba(123, 44, 191, 0.02);
    }

    /* 标准流程时间线 */
    .timeline-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .timeline-step {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--accent-light);
      margin-bottom: 8px;
    }

    .step-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    /* 用户评论卡片 */
    .review-card {
      background: var(--bg-surface);
      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-user-info {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 18px;
      padding-top: 16px;
      border-top: 1px dashed var(--border-color);
    }

    .user-avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--bright-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

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

    .user-meta-role {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* FAQ 手风琴 */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.25s ease;
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

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

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

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: rgba(123, 44, 191, 0.02);
      color: var(--text-muted);
      font-size: 0.95rem;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 24px 20px 24px;
    }

    /* 表单区域 */
    .contact-form-card {
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

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

    .form-label {
      display: block;
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-input,
    .form-select,
    .form-textarea {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      color: var(--text-main);
      background: #ffffff;
      outline: none;
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .form-input:focus,
    .form-select:focus,
    .form-textarea:focus {
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(123, 44, 191, 0.12);
    }

    .form-textarea {
      min-height: 120px;
      resize: vertical;
    }

    /* 文章与资讯 */
    .article-link-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item-link {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: 16px 20px;
      background: var(--bg-surface);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      text-decoration: none;
      color: var(--text-main);
      font-weight: 500;
      transition: all 0.2s ease;
    }

    .article-item-link:hover {
      border-color: var(--primary-color);
      color: var(--primary-color);
      transform: translateX(4px);
    }

    /* 友情链接与底部信息 */
    .links-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 14px;
      margin-top: 16px;
    }

    .links-grid a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.9rem;
      background: #ffffff;
      padding: 6px 14px;
      border-radius: 6px;
      border: 1px solid var(--border-color);
      transition: all 0.2s ease;
    }

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

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

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

    .footer-col-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 18px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .footer-links-list a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.9rem;
      transition: color 0.2s ease;
    }

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

    .footer-qrcode-wrap {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      gap: 10px;
    }

    .footer-qrcode-wrap img {
      width: 110px;
      height: 110px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
    }

    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 14px;
      font-size: 0.88rem;
    }

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

    .floating-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--bright-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      text-decoration: none;
      box-shadow: 0 4px 15px rgba(123, 44, 191, 0.35);
      cursor: pointer;
      border: none;
      transition: transform 0.25s ease;
    }

    .floating-btn:hover {
      transform: scale(1.1);
    }

    /* 响应式样式规范 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.2rem;
      }
      .grid-4, .hero-stats-grid, .timeline-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .nav-links {
        display: none;
      }
      .menu-toggle {
        display: flex;
      }
      .mobile-menu-active .nav-links {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 20px;
        box-shadow: var(--shadow-md);
      }
      .mobile-menu-active .nav-item {
        width: 100%;
      }
      .mobile-menu-active .nav-link,
      .mobile-menu-active .ai-page-home-link {
        width: 100%;
        padding: 12px 0;
        border-bottom: 1px solid rgba(123, 44, 191, 0.08);
      }
    }

    @media (max-width: 768px) {
      .section-title {
        font-size: 1.75rem;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-2, .grid-3, .grid-4, .hero-stats-grid, .timeline-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-buttons {
        flex-direction: column;
        width: 100%;
      }
      .hero-buttons .btn {
        width: 100%;
      }
    }