:root {
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --primary-light: #eff6ff;
      --accent: #0284c7;
      --accent-warm: #f59e0b;
      --success: #10b981;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-light: #64748b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --border-focus: #93c5fd;
      --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, 0.04);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --radius-full: 9999px;
      --transition: all 0.25s ease-in-out;
    }

    * {
      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: var(--transition);
    }

    /* 全局主容器 */
    .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-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

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

    .ai-page-logo {
      height: 40px;
      width: auto;
      display: block;
    }

    .brand-text {
      font-size: 20px;
      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: inline-block;
      padding: 8px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-muted);
      border-radius: var(--radius-sm);
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background-color: var(--primary);
      color: #ffffff !important;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    }

    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
    }

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

    .btn-outline:hover {
      background-color: var(--primary-light);
      transform: translateY(-2px);
    }

    .btn-sm {
      padding: 6px 14px;
      font-size: 13px;
    }

    .btn-lg {
      padding: 14px 32px;
      font-size: 17px;
    }

    /* 移动端汉堡菜单 */
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
    }

    .mobile-menu-btn span {
      display: block;
      width: 24px;
      height: 2px;
      background-color: var(--text-main);
      margin: 5px 0;
      transition: var(--transition);
    }

    /* 通用Section */
    .section-wrap {
      padding: 70px 0;
      border-bottom: 1px solid var(--border-color);
      background-color: #ffffff;
    }

    .section-wrap.alt-bg {
      background-color: var(--bg-page);
    }

    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 48px;
    }

    .section-badge {
      display: inline-block;
      padding: 4px 12px;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      background-color: var(--primary-light);
      border-radius: var(--radius-full);
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-light);
      line-height: 1.6;
    }

    /* 首屏 Hero 纯CSS设计，无图片 */
    .hero-section {
      background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 50%, #e0effe 100%);
      padding: 90px 0 80px;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

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

    .hero-badge-wrap {
      margin-bottom: 20px;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background-color: #ffffff;
      border: 1px solid #bfdbfe;
      border-radius: var(--radius-full);
      color: var(--primary);
      font-size: 14px;
      font-weight: 600;
      box-shadow: var(--shadow-sm);
    }

    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background-color: var(--success);
      border-radius: 50%;
      display: inline-block;
    }

    .hero-title {
      font-size: 42px;
      font-weight: 900;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      color: var(--primary);
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
      max-width: 820px;
      margin-left: auto;
      margin-right: auto;
    }

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

    .hero-highlight-btn {
      position: relative;
      overflow: hidden;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .hero-stat-card {
      background-color: #ffffff;
      padding: 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .hero-stat-num {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .hero-stat-label {
      font-size: 13px;
      color: var(--text-light);
      font-weight: 500;
    }

    /* 平台支持模型标签滚动条 */
    .model-tags-wrap {
      margin-top: 36px;
      background-color: #ffffff;
      border: 1px dashed #cbd5e1;
      border-radius: var(--radius-md);
      padding: 16px;
    }

    .model-tags-title {
      font-size: 13px;
      font-weight: 700;
      color: var(--text-light);
      margin-bottom: 12px;
      text-transform: uppercase;
    }

    .model-tags-list {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 8px;
    }

    .model-tag {
      padding: 4px 10px;
      background-color: var(--bg-page);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 12px;
      font-weight: 600;
      color: var(--text-muted);
      transition: var(--transition);
    }

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

    /* 卡片网格 */
    .cards-grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .cards-grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
    }

    .feature-card {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 28px 24px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-md);
      background-color: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 18px;
    }

    .card-title {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 16px;
    }

    .card-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
      margin-top: auto;
    }

    .card-subtag {
      font-size: 12px;
      padding: 2px 8px;
      background-color: var(--bg-page);
      color: var(--text-light);
      border-radius: 4px;
    }

    /* 图文展示与案例中心 */
    .image-showcase-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .image-card {
      background-color: #ffffff;
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .image-thumb-wrap {
      width: 100%;
      aspect-ratio: 16 / 10;
      background-color: #e2e8f0;
      overflow: hidden;
    }

    .image-thumb-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }

    .image-card:hover .image-thumb-wrap img {
      transform: scale(1.04);
    }

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

    .image-card-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .image-card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比评测高亮区 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #eff6ff 0%, #ffffff 100%);
      border: 2px solid #bfdbfe;
      border-radius: var(--radius-lg);
      padding: 32px;
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
    }

    .eval-score-info {
      display: flex;
      align-items: center;
      gap: 24px;
    }

    .eval-score-circle {
      width: 90px;
      height: 90px;
      border-radius: 50%;
      background-color: var(--primary);
      color: #ffffff;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
    }

    .eval-score-val {
      font-size: 28px;
      font-weight: 900;
      line-height: 1;
    }

    .eval-score-max {
      font-size: 11px;
      opacity: 0.9;
    }

    .eval-text h3 {
      font-size: 22px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .eval-stars {
      color: #f59e0b;
      font-size: 18px;
      margin-bottom: 4px;
    }

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

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }

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

    .custom-table th {
      background-color: #f8fafc;
      color: var(--text-main);
      font-weight: 700;
    }

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

    .custom-table .col-highlight {
      background-color: #eff6ff;
      font-weight: 600;
      color: var(--primary);
    }

    .badge-win {
      display: inline-block;
      padding: 2px 8px;
      background-color: #dbeafe;
      color: var(--primary);
      font-size: 12px;
      border-radius: 4px;
      font-weight: 700;
    }

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

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

    .step-number {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background-color: var(--primary);
      color: #ffffff;
      font-weight: 800;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 16px;
      font-size: 16px;
    }

    .step-title {
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .step-desc {
      font-size: 13px;
      color: var(--text-light);
      line-height: 1.5;
    }

    /* 用户评论 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .testimonial-card {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-quote {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
      font-style: normal;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

    .user-avatar-initial {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background-color: var(--primary-light);
      color: var(--primary);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
    }

    .user-meta-name {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-meta-role {
      font-size: 12px;
      color: var(--text-light);
    }

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 20px;
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      align-items: center;
      justify-content: space-between;
      cursor: pointer;
      user-select: none;
      background-color: #ffffff;
      transition: var(--transition);
    }

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

    .faq-icon {
      font-size: 18px;
      font-weight: 400;
      transition: transform 0.3s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background-color: #f8fafc;
      border-top: 1px solid transparent;
    }

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

    .faq-answer-inner {
      padding: 16px 20px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 表单与需求匹配 */
    .form-box {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
      max-width: 760px;
      margin: 0 auto;
    }

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

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 14px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      background-color: #ffffff;
      color: var(--text-main);
      transition: var(--transition);
    }

    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }

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

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }

    /* 资讯文章列表 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }

    .article-item {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .article-item:hover {
      border-color: var(--border-focus);
      transform: translateY(-2px);
    }

    .article-title {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
      line-height: 1.4;
    }

    .article-links-wrap {
      margin-top: 12px;
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .article-link-tag {
      font-size: 12px;
      color: var(--primary);
      background-color: var(--primary-light);
      padding: 4px 10px;
      border-radius: 4px;
      display: inline-block;
    }

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

    /* 联系与客服 */
    .contact-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
      align-items: center;
    }

    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      padding: 16px 20px;
      border-radius: var(--radius-md);
    }

    .contact-icon-badge {
      width: 36px;
      height: 36px;
      border-radius: 8px;
      background-color: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      font-weight: 800;
      flex-shrink: 0;
    }

    .contact-details h4 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 2px;
    }

    .contact-details p {
      font-size: 14px;
      color: var(--text-muted);
    }

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

    .qr-card img {
      max-width: 180px;
      width: 100%;
      height: auto;
      margin: 0 auto 12px;
      border-radius: 8px;
      display: block;
      border: 1px solid var(--border-color);
    }

    /* 友情链接与页脚 */
    .friend-links-box {
      background-color: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      margin-bottom: 30px;
    }

    .friend-links-title {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .friend-links-list a {
      font-size: 13px;
      color: var(--text-light);
      background-color: var(--bg-page);
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid var(--border-color);
    }

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

    .site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 40px 0 24px;
      color: var(--text-light);
      font-size: 14px;
    }

    .footer-top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 1px solid var(--border-color);
      margin-bottom: 24px;
    }

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

    .footer-nav {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
    }

    .footer-nav a {
      color: var(--text-muted);
    }

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

    .footer-bottom {
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 13px;
    }

    /* 悬浮客服与返回顶部 */
    .floating-widget {
      position: fixed;
      right: 24px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background-color: #ffffff;
      color: var(--primary);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      font-size: 14px;
      font-weight: 700;
      transition: var(--transition);
    }

    .float-btn:hover {
      background-color: var(--primary);
      color: #ffffff;
      transform: translateY(-3px);
    }

    /* 响应式适配 */
    @media (max-width: 1024px) {
      .hero-title {
        font-size: 34px;
      }
      .cards-grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .header-inner {
        height: 64px;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        width: 100%;
        background-color: #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 a {
        width: 100%;
        padding: 10px 0;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title {
        font-size: 26px;
      }
      .hero-subtitle {
        font-size: 15px;
      }
      .cards-grid-3,
      .image-showcase-grid,
      .testimonials-grid,
      .contact-grid,
      .articles-grid,
      .cards-grid-2 {
        grid-template-columns: 1fr;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
      .section-title {
        font-size: 24px;
      }
      .eval-highlight-box {
        flex-direction: column;
        text-align: center;
        justify-content: center;
      }
      .eval-score-info {
        flex-direction: column;
      }
    }