:root {
      --primary: #10b981;
      --primary-dark: #059669;
      --primary-light: #ecfdf5;
      --primary-subtle: #d1fae5;
      --accent: #0284c7;
      --text-main: #1e293b;
      --text-muted: #475569;
      --text-subtle: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.03);
      --radius: 12px;
      --radius-sm: 8px;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.2s ease;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 1px solid var(--border-color);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 70px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--primary-dark);
    }

    .brand img.ai-page-logo {
      height: 36px;
      width: auto;
      object-fit: contain;
    }

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

    .nav-links li a {
      padding: 8px 12px;
      font-size: 0.95rem;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
      white-space: nowrap;
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.2s ease;
      text-align: center;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 2px 4px rgba(16, 185, 129, 0.2);
    }

    .btn-primary:hover {
      background-color: var(--primary-dark);
      box-shadow: 0 4px 8px rgba(16, 185, 129, 0.3);
      color: #ffffff;
    }

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

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

    .btn-white {
      background-color: #ffffff;
      color: var(--primary-dark);
      border: 1px solid var(--border-color);
    }

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

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

    /* 首屏 Hero */
    .hero-section {
      background: linear-gradient(135deg, #f0fdf4 0%, #e6fffa 50%, #f8fafc 100%);
      padding: 80px 0 60px 0;
      border-bottom: 1px solid var(--border-color);
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 16px;
      background: var(--primary-subtle);
      color: var(--primary-dark);
      font-size: 0.875rem;
      font-weight: 600;
      border-radius: 9999px;
      margin-bottom: 24px;
      border: 1px solid rgba(16, 185, 129, 0.2);
    }

    .hero-title {
      font-size: 2.5rem;
      line-height: 1.25;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 20px;
    }

    .hero-desc {
      font-size: 1.125rem;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px;
    }

    .hero-btns {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }

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

    .stat-card {
      background: #ffffff;
      padding: 24px 20px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
    }

    .stat-val {
      font-size: 1.85rem;
      font-weight: 700;
      color: var(--primary-dark);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.875rem;
      color: var(--text-subtle);
    }

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

    .section-alt {
      background-color: #ffffff;
    }

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

    .section-subtitle {
      font-size: 0.875rem;
      font-weight: 700;
      color: var(--primary);
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 16px;
    }

    .section-intro {
      font-size: 1rem;
      color: var(--text-muted);
    }

    /* 网格与卡片 */
    .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: 32px;
    }

    .feature-card {
      background: var(--bg-card);
      border-radius: var(--radius);
      padding: 28px 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      display: flex;
      flex-direction: column;
    }

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

    .feature-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: var(--primary-light);
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.3rem;
      font-weight: bold;
      margin-bottom: 20px;
    }

    .feature-card h3 {
      font-size: 1.2rem;
      font-weight: 600;
      margin-bottom: 12px;
      color: #0f172a;
    }

    .feature-card p {
      font-size: 0.925rem;
      color: var(--text-muted);
      flex-grow: 1;
      line-height: 1.55;
    }

    /* 模型矩阵徽章 */
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      background: #ffffff;
      border: 1px solid var(--border-color);
      color: var(--text-main);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 500;
      box-shadow: var(--shadow-sm);
    }

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

    .step-item {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .step-num {
      display: inline-block;
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 12px;
    }

    .step-item h3 {
      font-size: 1.1rem;
      margin-bottom: 8px;
      color: #0f172a;
    }

    .step-item p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* 评测与对比表格 */
    .eval-box {
      background: linear-gradient(135deg, #f0fdf4 0%, #ffffff 100%);
      border: 1px solid var(--primary-subtle);
      border-radius: var(--radius);
      padding: 30px;
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
    }

    .eval-score-wrap {
      display: flex;
      align-items: center;
      gap: 16px;
    }

    .eval-score-num {
      font-size: 3rem;
      font-weight: 800;
      color: var(--primary-dark);
      line-height: 1;
    }

    .eval-stars {
      color: #f59e0b;
      font-size: 1.25rem;
      letter-spacing: 2px;
    }

    .table-container {
      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;
      min-width: 650px;
    }

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

    .compare-table th {
      background: #f8fafc;
      color: #0f172a;
      font-weight: 600;
    }

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

    .highlight-col {
      background-color: rgba(16, 185, 129, 0.04);
      font-weight: 600;
      color: var(--primary-dark);
    }

    /* 图片图文展示 */
    .media-card {
      background: #ffffff;
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .media-card-img {
      width: 100%;
      aspect-ratio: 16 / 9;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }

    .media-card-img.square {
      aspect-ratio: 1 / 1;
    }

    .media-card-img img {
      width: 100%;
      height: 100%;
      object-fit: contain;
    }

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

    .media-card-body h3 {
      font-size: 1.1rem;
      margin-bottom: 8px;
      color: #0f172a;
    }

    .media-card-body p {
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    /* FAQ 手风琴 */
    .faq-list {
      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-sm);
      overflow: hidden;
      transition: border-color 0.2s ease;
    }

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

    .faq-question {
      padding: 18px 20px;
      font-size: 1rem;
      font-weight: 600;
      color: #0f172a;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-icon {
      font-size: 1.25rem;
      color: var(--primary);
      transition: transform 0.2s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      padding: 0 20px;
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.6;
      background: #fbfdfe;
    }

    .faq-item.active .faq-answer {
      max-height: 300px;
      padding: 0 20px 18px 20px;
    }

    /* 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-body {
      font-size: 0.925rem;
      color: var(--text-main);
      margin-bottom: 20px;
      line-height: 1.6;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .review-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-dark);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.9rem;
    }

    .review-info h3 {
      font-size: 0.95rem;
      font-weight: 600;
      color: #0f172a;
    }

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

    /* 表单区域 */
    .form-container {
      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: 20px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: #0f172a;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      outline: none;
      transition: border-color 0.2s;
      background: #fcfdfe;
    }

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

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

    /* 资讯与友情链接 */
    .articles-box {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      margin-bottom: 30px;
    }

    .articles-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 12px;
    }

    .articles-links a {
      color: var(--primary-dark);
      background: var(--primary-light);
      padding: 6px 12px;
      border-radius: var(--radius-sm);
      font-size: 0.875rem;
    }

    .articles-links a:hover {
      background: var(--primary-subtle);
    }

    /* 联系我们与页脚 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 30px;
      align-items: center;
    }

    .contact-info-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .contact-info-list li {
      font-size: 0.95rem;
      color: var(--text-muted);
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .contact-info-list strong {
      color: #0f172a;
      min-width: 90px;
    }

    .qr-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      max-width: 240px;
      margin: 0 auto;
    }

    .qr-card img {
      max-width: 160px;
      height: auto;
      border-radius: var(--radius-sm);
      margin-bottom: 10px;
    }

    .qr-card p {
      font-size: 0.85rem;
      color: var(--text-subtle);
    }

    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 40px 0 24px 0;
      color: var(--text-muted);
    }

    .footer-links-wrap {
      margin-bottom: 24px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--border-color);
    }

    .footer-links-title {
      font-size: 0.9rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 12px;
    }

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

    .friend-links a {
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    .friend-links a:hover {
      color: var(--primary-dark);
    }

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.875rem;
      color: var(--text-subtle);
    }

    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 12px;
      box-shadow: var(--shadow-lg);
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 6px;
      cursor: pointer;
      text-align: center;
    }

    .float-kefu img {
      width: 60px;
      height: 60px;
      border-radius: 4px;
    }

    .float-kefu span {
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--primary-dark);
    }

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

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 70px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: flex-start;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .menu-toggle {
        display: block;
      }
      .grid-3, .grid-2, .grid-4, .hero-stats-grid, .step-timeline, .contact-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .section-title {
        font-size: 1.6rem;
      }
      .eval-box {
        flex-direction: column;
        align-items: flex-start;
      }
      .float-kefu {
        right: 10px;
        bottom: 15px;
        padding: 8px;
      }
      .float-kefu img {
        width: 48px;
        height: 48px;
      }
    }