:root {
      --primary: #4361ee;
      --primary-gradient: linear-gradient(135deg, #4361ee 0%, #3a0ca3 50%, #7209b7 100%);
      --rainbow-gradient: linear-gradient(135deg, #ff4d6d 0%, #f72585 20%, #7209b7 40%, #3a0ca3 60%, #4361ee 80%, #4cc9f0 100%);
      --rainbow-subtle: linear-gradient(135deg, rgba(255, 77, 109, 0.08) 0%, rgba(114, 9, 183, 0.08) 50%, rgba(76, 201, 240, 0.08) 100%);
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-base: #f8fafc;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
      --shadow-md: 0 10px 25px -5px rgba(0, 0, 0, 0.08);
      --shadow-rainbow: 0 12px 30px -10px rgba(114, 9, 183, 0.25);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-base);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }

    img {
      display: block;
      max-width: 100%;
      height: auto;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

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

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

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

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

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: #334155;
      padding: 8px 12px;
      border-radius: var(--radius-sm);
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: rgba(67, 97, 238, 0.08);
    }

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

    .btn-rainbow {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--rainbow-gradient);
      color: #ffffff !important;
      padding: 10px 22px;
      font-weight: 600;
      font-size: 0.95rem;
      border-radius: 9999px;
      box-shadow: var(--shadow-rainbow);
      border: none;
      cursor: pointer;
      white-space: nowrap;
      transition: var(--transition);
    }

    .btn-rainbow:hover {
      transform: translateY(-2px);
      filter: brightness(1.08);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: transparent;
      color: var(--primary);
      border: 1.5px solid var(--primary);
      padding: 9px 20px;
      font-weight: 600;
      font-size: 0.95rem;
      border-radius: 9999px;
      cursor: pointer;
      white-space: nowrap;
      transition: var(--transition);
    }

    .btn-outline:hover {
      background: rgba(67, 97, 238, 0.06);
    }

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

    /* 区域通用规范 */
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }

    .section-wrap:nth-child(even) {
      background-color: #ffffff;
    }

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

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      border-radius: 999px;
      font-size: 0.85rem;
      font-weight: 600;
      background: var(--rainbow-subtle);
      color: #7209b7;
      margin-bottom: 12px;
      border: 1px solid rgba(114, 9, 183, 0.15);
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: #0f172a;
      line-height: 1.3;
      margin-bottom: 16px;
    }

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

    /* 首屏 Hero (无图纯视觉) */
    .hero-section {
      padding: 100px 0 80px 0;
      background: radial-gradient(circle at 10% 20%, rgba(255, 77, 109, 0.05) 0%, transparent 40%),
                  radial-gradient(circle at 90% 80%, rgba(76, 201, 240, 0.08) 0%, transparent 40%),
                  #ffffff;
      border-bottom: 1px solid var(--border-color);
      text-align: center;
    }

    .hero-container {
      max-width: 960px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #f1f5f9;
      border: 1px solid #cbd5e1;
      border-radius: 999px;
      font-size: 0.88rem;
      font-weight: 600;
      color: #334155;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      color: #0f172a;
      line-height: 1.25;
      margin-bottom: 24px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      background: var(--rainbow-gradient);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.2rem;
      color: #475569;
      max-width: 820px;
      margin: 0 auto 36px auto;
      line-height: 1.7;
    }

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

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .stat-card {
      background: var(--bg-base);
      border: 1px solid var(--border-color);
      padding: 24px 16px;
      border-radius: var(--radius-md);
      transition: var(--transition);
    }

    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(67, 97, 238, 0.3);
    }

    .stat-num {
      font-size: 2.2rem;
      font-weight: 800;
      color: #0f172a;
      margin-bottom: 4px;
    }

    .stat-num span {
      color: #7209b7;
      font-size: 1.4rem;
    }

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

    /* 平台矩阵卡片 */
    .models-ticker-box {
      margin-top: 30px;
      padding: 20px;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }

    .models-ticker-title {
      font-size: 0.9rem;
      color: var(--text-muted);
      margin-bottom: 14px;
      text-transform: uppercase;
      letter-spacing: 1px;
    }

    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
    }

    .model-tag {
      padding: 6px 14px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
      font-weight: 500;
      color: #334155;
      transition: var(--transition);
    }

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

    /* 核心服务网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
      gap: 24px;
    }

    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: var(--transition);
      position: relative;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: rgba(67, 97, 238, 0.4);
    }

    .service-icon-box {
      width: 50px;
      height: 50px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: var(--rainbow-subtle);
      color: #4361ee;
      font-size: 1.4rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .service-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 12px;
    }

    .service-card p {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 对比评测卡片与表格 */
    .review-score-banner {
      background: linear-gradient(135deg, #1e1b4b 0%, #31104b 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      flex-wrap: wrap;
      gap: 24px;
      margin-bottom: 40px;
      box-shadow: var(--shadow-md);
    }

    .review-left h3 {
      font-size: 1.8rem;
      font-weight: 800;
      margin-bottom: 8px;
      color: #ffffff;
    }

    .review-left p {
      color: #cbd5e1;
      font-size: 1rem;
    }

    .score-badge-area {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .score-val {
      font-size: 3.6rem;
      font-weight: 900;
      color: #38bdf8;
      line-height: 1;
    }

    .score-details {
      text-align: right;
    }

    .score-stars {
      color: #facc15;
      font-size: 1.3rem;
      margin-bottom: 4px;
    }

    .score-desc {
      font-size: 0.85rem;
      color: #94a3b8;
    }

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

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

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

    .comparison-table th {
      background: #f8fafc;
      font-weight: 700;
      color: #334155;
    }

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

    .comparison-table .highlight-col {
      background: rgba(67, 97, 238, 0.03);
      font-weight: 600;
      color: #4361ee;
    }

    .tag-check {
      color: #10b981;
      font-weight: bold;
    }

    .tag-cross {
      color: #94a3b8;
    }

    /* 流程步骤 */
    .flow-steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .flow-step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px 24px;
      position: relative;
    }

    .step-number {
      font-size: 2rem;
      font-weight: 900;
      color: rgba(67, 97, 238, 0.15);
      line-height: 1;
      margin-bottom: 12px;
    }

    .flow-step-card h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: #0f172a;
    }

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

    /* 案例图片展示 */
    .case-media-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      margin-bottom: 30px;
    }

    .case-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .case-img-wrap {
      position: relative;
      overflow: hidden;
      background: #e2e8f0;
    }

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }

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

    .case-info {
      padding: 20px;
    }

    .case-info h4 {
      font-size: 1.1rem;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 6px;
    }

    .case-info p {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
      gap: 24px;
    }

    .user-review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }

    .user-review-card:hover {
      box-shadow: var(--shadow-md);
      transform: translateY(-3px);
    }

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

    .user-avatar-circle {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--rainbow-gradient);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
    }

    .user-details h5 {
      font-size: 0.98rem;
      font-weight: 700;
      color: #0f172a;
    }

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

    .review-text {
      font-size: 0.92rem;
      color: #334155;
      line-height: 1.6;
      margin-bottom: 14px;
    }

    .review-stars {
      color: #facc15;
      font-size: 0.9rem;
    }

    /* 资讯与外链 */
    .articles-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
      margin-top: 24px;
    }

    .article-link-card {
      padding: 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      color: #1e293b;
      font-size: 0.9rem;
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: var(--transition);
    }

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

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 880px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

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

    .faq-header {
      padding: 20px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.05rem;
      color: #0f172a;
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
      color: #64748b;
    }

    .faq-body {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out, padding 0.3s ease;
      padding: 0 24px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

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

    .faq-item.active .faq-body {
      max-height: 300px;
      padding-bottom: 20px;
    }

    /* 表单与转化区 */
    .form-wrapper {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
      max-width: 760px;
      margin: 0 auto;
    }

    .form-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-bottom: 20px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 8px;
      margin-bottom: 20px;
    }

    .form-group label {
      font-size: 0.92rem;
      font-weight: 600;
      color: #334155;
    }

    .form-control {
      padding: 12px 16px;
      border: 1px solid #cbd5e1;
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      font-family: inherit;
      color: #0f172a;
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(67, 97, 238, 0.15);
    }

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

    /* 联系与渠道 */
    .contact-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 24px;
      margin-top: 40px;
    }

    .contact-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      transition: var(--transition);
    }

    .contact-card:hover {
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }

    .qr-img-box {
      width: 140px;
      height: 140px;
      margin: 0 auto 16px auto;
      border: 1px solid var(--border-color);
      padding: 6px;
      background: #ffffff;
      border-radius: var(--radius-sm);
    }

    .qr-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* 页脚 */
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px 0;
      font-size: 0.9rem;
    }

    .footer-top {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      padding-bottom: 40px;
      border-bottom: 1px solid #334155;
    }

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.25rem;
      margin-bottom: 12px;
    }

    .footer-col h5 {
      color: #ffffff;
      font-size: 1rem;
      margin-bottom: 16px;
    }

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

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

    .footer-bottom {
      padding-top: 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friendly-links-wrap {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .friendly-links-wrap a {
      color: #cbd5e1;
      font-size: 0.88rem;
    }

    .friendly-links-wrap a:hover {
      color: #38bdf8;
    }

    /* 浮动组件与返回顶部 */
    .floating-box {
      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: #ffffff;
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid var(--border-color);
      cursor: pointer;
      color: #0f172a;
      font-weight: 700;
      transition: var(--transition);
      text-decoration: none;
    }

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

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.3rem;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .case-media-grid {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .hero-desc {
        font-size: 1rem;
      }
      .hero-stats-grid {
        grid-template-columns: 1fr;
      }
      .flow-steps-grid {
        grid-template-columns: 1fr;
      }
      .form-row {
        grid-template-columns: 1fr;
      }
      .score-badge-area {
        width: 100%;
        justify-content: space-between;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }