:root {
      --primary: #0062ff;
      --primary-hover: #0050d4;
      --accent: #00d2ff;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --bg-main: #f8fafc;
      --bg-white: #ffffff;
      --bg-alt: #f1f5f9;
      --border-color: #e2e8f0;
      --shadow-sm: 0 2px 4px rgba(0,0,0,0.04);
      --shadow-md: 0 10px 25px -5px rgba(0, 98, 255, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --shadow-lg: 0 20px 30px -10px rgba(0, 98, 255, 0.12);
      --radius: 12px;
      --container-max: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.65;
      font-size: 16px;
      overflow-x: hidden;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

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

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 头部导航 */
    header.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);
      box-shadow: var(--shadow-sm);
    }

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

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

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

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

    .nav-links li a {
      font-weight: 500;
      font-size: 15px;
      color: var(--text-main);
      padding: 8px 14px;
      border-radius: 6px;
      display: inline-block;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background-color: rgba(0, 98, 255, 0.05);
    }

    .nav-cta-btn {
      background: linear-gradient(135deg, var(--primary), var(--accent));
      color: #fff !important;
      font-weight: 600;
      padding: 10px 22px !important;
      border-radius: 30px !important;
      box-shadow: 0 4px 14px rgba(0, 98, 255, 0.25);
    }

    .nav-cta-btn:hover {
      box-shadow: 0 6px 20px rgba(0, 98, 255, 0.35);
      transform: translateY(-1px);
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 6px;
    }

    .menu-toggle span {
      display: block;
      width: 24px;
      height: 2px;
      background: var(--text-main);
      margin: 5px 0;
      transition: 0.3s;
    }

    /* 首屏 Hero */
    .hero-section {
      background: linear-gradient(180deg, #ffffff 0%, #edf4ff 50%, var(--bg-main) 100%);
      padding: 80px 0 70px;
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      background: #e0edff;
      border: 1px solid #c2dcff;
      color: var(--primary);
      font-size: 14px;
      font-weight: 600;
      padding: 6px 18px;
      border-radius: 20px;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 42px;
      font-weight: 800;
      color: #0f172a;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 19px;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.6;
    }

    .hero-btn-group {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      font-weight: 600;
      padding: 14px 34px;
      border-radius: 30px;
      color: #fff;
      background: linear-gradient(135deg, #0052d9, #00a0ff);
      box-shadow: 0 8px 24px rgba(0, 98, 255, 0.3);
      cursor: pointer;
      border: none;
    }

    .btn-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 30px rgba(0, 98, 255, 0.4);
    }

    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      font-size: 16px;
      font-weight: 600;
      padding: 14px 32px;
      border-radius: 30px;
      color: var(--primary);
      background: #ffffff;
      border: 2px solid #bfdbfe;
      cursor: pointer;
    }

    .btn-outline:hover {
      background: #eff6ff;
      border-color: var(--primary);
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 1040px;
      margin: 0 auto;
      text-align: left;
    }

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

    .stat-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
      border-color: #bfdbfe;
    }

    .stat-card .stat-val {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .stat-card .stat-label {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .stat-card .stat-desc {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 模块通用样式 */
    section.page-section {
      padding: 85px 0;
      border-bottom: 1px solid var(--border-color);
    }

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

    .section-tag {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      background: rgba(0, 98, 255, 0.08);
      display: inline-block;
      padding: 4px 14px;
      border-radius: 12px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 34px;
      font-weight: 800;
      color: #0f172a;
      line-height: 1.3;
      margin-bottom: 14px;
    }

    .section-subtitle {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* 平台介绍 */
    .about-box {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow-sm);
      margin-bottom: 40px;
    }

    .about-text-content p {
      font-size: 16px;
      color: #334155;
      margin-bottom: 16px;
    }

    .about-highlights {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .about-highlight-item {
      padding: 20px;
      background: var(--bg-alt);
      border-radius: 8px;
      border-left: 4px solid var(--primary);
    }

    .about-highlight-item h4 {
      font-size: 16px;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 6px;
    }

    .about-highlight-item p {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 0;
    }

    /* 支持模型标签云 */
    .models-cloud-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }

    .cloud-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 20px;
      text-align: center;
      color: var(--text-main);
    }

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

    .model-chip {
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      padding: 6px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: #334155;
      transition: 0.2s ease;
    }

    .model-chip:hover {
      background: #e0f2fe;
      border-color: #7dd3fc;
      color: #0369a1;
      transform: translateY(-2px);
    }

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

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

    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #93c5fd;
    }

    .card-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: #eff6ff;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 800;
      margin-bottom: 18px;
    }

    .service-card h3 {
      font-size: 19px;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 10px;
    }

    .service-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    .card-footer-tag {
      margin-top: 16px;
      font-size: 12px;
      font-weight: 600;
      color: var(--primary);
    }

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

    .timeline-step {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px 22px;
      position: relative;
    }

    .step-number {
      font-size: 28px;
      font-weight: 900;
      color: #cbd5e1;
      margin-bottom: 10px;
      line-height: 1;
    }

    .timeline-step h4 {
      font-size: 17px;
      font-weight: 700;
      color: #0f172a;
      margin-bottom: 8px;
    }

    .timeline-step p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

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

    .case-banner-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .case-banner-box img {
      border-radius: 8px;
      width: 100%;
      height: 320px;
      object-fit: cover;
    }

    .case-desc-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }

    .case-desc-box h3 {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .case-desc-box p {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 14px;
    }

    .media-sub-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .media-sub-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 14px;
    }

    .media-sub-item img {
      border-radius: 6px;
      width: 100%;
      height: 190px;
      object-fit: cover;
      margin-bottom: 10px;
    }

    .media-sub-item h4 {
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 4px;
    }

    .media-sub-item p {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 对比评测表格 */
    .review-score-card {
      background: linear-gradient(135deg, #0284c7, var(--primary));
      color: #ffffff;
      border-radius: var(--radius);
      padding: 30px 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      box-shadow: var(--shadow-md);
    }

    .score-left h3 {
      font-size: 26px;
      font-weight: 800;
      margin-bottom: 8px;
    }

    .score-left p {
      font-size: 15px;
      opacity: 0.9;
    }

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

    .score-num {
      font-size: 46px;
      font-weight: 900;
      line-height: 1;
    }

    .score-num span {
      font-size: 20px;
      opacity: 0.8;
      font-weight: 600;
    }

    .score-stars {
      color: #fbbf24;
      font-size: 18px;
      margin-top: 6px;
    }

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

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }

    .compare-table th {
      background: #f8fafc;
      font-weight: 700;
      color: #1e293b;
    }

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

    .compare-table tr:hover td {
      background-color: #f8fafc;
    }

    .highlight-col {
      background-color: rgba(0, 98, 255, 0.03);
      font-weight: 600;
      color: var(--primary);
    }

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

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 26px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .review-quote {
      font-size: 14px;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 20px;
      position: relative;
    }

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

    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #e2e8f0;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: var(--primary);
      font-size: 15px;
    }

    .author-info h5 {
      font-size: 14px;
      font-weight: 700;
      color: #0f172a;
    }

    .author-info span {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
      transition: 0.2s;
    }

    .faq-item.active {
      border-color: #93c5fd;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 600;
      color: #0f172a;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

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

    .faq-toggle-icon {
      font-size: 20px;
      color: var(--text-muted);
      transition: transform 0.2s ease;
    }

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

    .faq-answer {
      display: none;
      padding: 0 24px 20px;
      font-size: 14px;
      color: #475569;
      line-height: 1.7;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 表单与需求匹配 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .contact-info-side {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .info-list {
      list-style: none;
      margin: 20px 0;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .info-list li {
      font-size: 15px;
      color: #334155;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .qr-container {
      display: flex;
      align-items: center;
      gap: 16px;
      background: var(--bg-alt);
      padding: 16px;
      border-radius: 8px;
      margin-top: 20px;
    }

    .qr-container img {
      width: 90px;
      height: 90px;
      border-radius: 6px;
      border: 1px solid #e2e8f0;
    }

    .qr-desc h5 {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 4px;
    }

    .qr-desc p {
      font-size: 12px;
      color: var(--text-muted);
    }

    .form-box {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group label {
      font-size: 14px;
      font-weight: 600;
      color: #334155;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 14px;
      background-color: #f8fafc;
      color: var(--text-main);
      outline: none;
      transition: 0.2s;
    }

    .form-control:focus {
      border-color: var(--primary);
      background-color: #fff;
      box-shadow: 0 0 0 3px rgba(0, 98, 255, 0.1);
    }

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

    .article-links-row {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }

    .article-link-tag {
      background: var(--bg-alt);
      padding: 8px 14px;
      border-radius: 6px;
      font-size: 13px;
      color: #334155;
      border: 1px solid var(--border-color);
    }

    .article-link-tag:hover {
      border-color: var(--primary);
      color: var(--primary);
    }

    /* 页脚 */
    footer.site-footer {
      background-color: #0f172a;
      color: #94a3b8;
      padding: 60px 0 30px;
      font-size: 14px;
    }

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

    .footer-brand h4 {
      color: #ffffff;
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 12px;
    }

    .footer-brand p {
      line-height: 1.6;
      max-width: 400px;
      font-size: 13px;
    }

    .footer-col h5 {
      color: #ffffff;
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 14px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

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

    .friend-links-box {
      border-top: 1px solid #1e293b;
      padding: 20px 0;
      margin-bottom: 20px;
    }

    .friend-links-box span {
      color: #ffffff;
      font-weight: 600;
      margin-right: 12px;
      display: inline-block;
      margin-bottom: 8px;
    }

    .friend-links-box a {
      color: #94a3b8;
      margin-right: 16px;
      font-size: 13px;
      display: inline-block;
      margin-bottom: 6px;
    }

    .friend-links-box a:hover {
      color: var(--accent);
    }

    .footer-bottom {
      border-top: 1px solid #1e293b;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
    }

    /* 浮动客服入口 */
    .floating-kefu {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: #fff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      cursor: pointer;
      border: none;
      position: relative;
    }

    .float-btn:hover {
      transform: scale(1.05);
      background: var(--primary-hover);
    }

    .float-qr-pop {
      display: none;
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #fff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      width: 140px;
      text-align: center;
    }

    .float-qr-pop img {
      width: 100%;
      margin-bottom: 6px;
    }

    .float-qr-pop span {
      font-size: 12px;
      color: #334155;
      font-weight: 600;
    }

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

    /* 响应式适配 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 32px;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .cards-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .workflow-timeline {
        grid-template-columns: repeat(2, 1fr);
      }
      .reviews-grid {
        grid-template-columns: 1fr;
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .case-container-grid {
        grid-template-columns: 1fr;
      }
      .footer-top {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        position: absolute;
        top: 72px;
        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);
        display: none;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        width: 100%;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 26px;
      }
      .hero-subtitle {
        font-size: 15px;
      }
      .cards-grid {
        grid-template-columns: 1fr;
      }
      .workflow-timeline {
        grid-template-columns: 1fr;
      }
      .media-sub-grid {
        grid-template-columns: 1fr;
      }
      .about-highlights {
        grid-template-columns: 1fr;
      }
      .review-score-card {
        flex-direction: column;
        text-align: center;
        gap: 20px;
      }
      .score-right {
        text-align: center;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 10px;
        text-align: center;
      }
    }