:root {
      --primary: #0F52BA;
      --accent: #FF5A36;
      --secondary: #00B4D8;
      --dark: #111827;
      --text: #374151;
      --light-bg: #F8FAFC;
      --card-bg: #FFFFFF;
      --border: #E2E8F0;
      --container-w: 1200px;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--light-bg);
      color: var(--text);
      line-height: 1.6;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
    }
    .container {
      width: 100%;
      max-width: var(--container-w);
      margin: 0 auto;
      padding: 0 20px;
    }
    /* 顶部导航 */
    header {
      background: #FFFFFF;
      border-bottom: 2px solid var(--primary);
      position: sticky;
      top: 0;
      z-index: 1000;
      box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    }
    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .logo-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .logo-box img {
      max-height: 44px;
      width: auto;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      display: block;
      padding: 8px 14px;
      font-size: 15px;
      font-weight: 600;
      color: var(--dark);
      transition: color 0.2s;
    }
    .nav-links li a:hover {
      color: var(--accent);
    }
    .nav-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav-primary {
      background: var(--accent);
      color: #FFFFFF;
      padding: 9px 20px;
      border-radius: 6px;
      font-weight: 700;
      font-size: 14px;
      box-shadow: 0 3px 0 #D93815;
      transition: transform 0.1s, box-shadow 0.1s;
    }
    .btn-nav-primary:hover {
      transform: translateY(-1px);
      box-shadow: 0 4px 0 #D93815;
    }
    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--dark);
    }

    /* 首屏 Hero (无任何图片) */
    .hero-section {
      background: linear-gradient(135deg, #FFFFFF 0%, #EFF6FF 50%, #FFF5F2 100%);
      padding: 80px 0 60px;
      position: relative;
      border-bottom: 1px solid var(--border);
    }
    .hero-content {
      text-align: center;
      max-width: 960px;
      margin: 0 auto;
    }
    .hero-tag {
      display: inline-block;
      background: var(--primary);
      color: #FFFFFF;
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 1px;
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 20px;
      text-transform: uppercase;
    }
    .hero-title {
      font-size: 42px;
      font-weight: 900;
      line-height: 1.25;
      color: var(--dark);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      color: var(--accent);
    }
    .hero-desc {
      font-size: 18px;
      color: #4B5563;
      margin-bottom: 36px;
      line-height: 1.7;
    }
    .hero-btns {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .btn-hero-main {
      background: var(--accent);
      color: #FFFFFF;
      font-size: 18px;
      font-weight: 800;
      padding: 16px 36px;
      border-radius: 8px;
      box-shadow: 0 6px 0 #C22F0E, 0 12px 20px rgba(255, 90, 54, 0.25);
      transition: all 0.2s ease;
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-hero-main:hover {
      transform: translateY(-2px);
      box-shadow: 0 8px 0 #C22F0E, 0 16px 24px rgba(255, 90, 54, 0.3);
    }
    .btn-hero-sub {
      background: #FFFFFF;
      color: var(--primary);
      border: 2px solid var(--primary);
      font-size: 18px;
      font-weight: 700;
      padding: 14px 32px;
      border-radius: 8px;
      transition: all 0.2s ease;
    }
    .btn-hero-sub:hover {
      background: var(--primary);
      color: #FFFFFF;
    }
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      text-align: left;
    }
    .metric-card {
      background: #FFFFFF;
      padding: 20px;
      border-radius: 10px;
      border: 1px solid var(--border);
      box-shadow: 0 4px 6px rgba(0,0,0,0.02);
      border-top: 4px solid var(--secondary);
    }
    .metric-num {
      font-size: 28px;
      font-weight: 900;
      color: var(--dark);
      margin-bottom: 4px;
    }
    .metric-label {
      font-size: 14px;
      color: #6B7280;
      font-weight: 500;
    }

    /* 通用Section */
    .section-wrap {
      padding: 70px 0;
      border-bottom: 1px solid var(--border);
    }
    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }
    .section-pre {
      color: var(--accent);
      font-weight: 800;
      font-size: 14px;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 12px;
    }
    .section-subtitle {
      font-size: 16px;
      color: #6B7280;
      max-width: 680px;
      margin: 0 auto;
    }

    /* 平台介绍与多模型 */
    .platform-intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      align-items: center;
      margin-bottom: 40px;
    }
    .platform-text-box {
      background: #FFFFFF;
      padding: 32px;
      border-radius: 12px;
      border: 1px solid var(--border);
      border-left: 6px solid var(--primary);
    }
    .platform-text-box h3 {
      font-size: 24px;
      color: var(--dark);
      margin-bottom: 16px;
      font-weight: 800;
    }
    .platform-text-box p {
      font-size: 15px;
      color: #4B5563;
      margin-bottom: 16px;
      line-height: 1.8;
    }
    .feature-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 20px;
    }
    .feature-tag {
      background: #EFF6FF;
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      padding: 6px 12px;
      border-radius: 6px;
      border: 1px solid #BFDBFE;
    }
    .model-cloud-box {
      background: #FFFFFF;
      padding: 28px;
      border-radius: 12px;
      border: 1px solid var(--border);
    }
    .model-cloud-title {
      font-size: 18px;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 16px;
    }
    .model-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }
    .model-pill {
      background: #F1F5F9;
      color: #334155;
      font-size: 13px;
      font-weight: 600;
      padding: 6px 12px;
      border-radius: 6px;
      border: 1px solid #E2E8F0;
      transition: all 0.2s;
    }
    .model-pill:hover {
      background: var(--accent);
      color: #FFFFFF;
      border-color: var(--accent);
    }

    /* 服务能力卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: #FFFFFF;
      border-radius: 10px;
      padding: 24px;
      border: 1px solid var(--border);
      transition: transform 0.2s, box-shadow 0.2s;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 24px rgba(0,0,0,0.06);
      border-color: var(--secondary);
    }
    .service-badge {
      align-self: flex-start;
      background: #FEF2F2;
      color: var(--accent);
      font-size: 12px;
      font-weight: 700;
      padding: 3px 8px;
      border-radius: 4px;
      margin-bottom: 12px;
    }
    .service-title {
      font-size: 18px;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 10px;
    }
    .service-desc {
      font-size: 14px;
      color: #4B5563;
      line-height: 1.6;
    }

    /* 评测与对比板块 */
    .eval-banner {
      background: linear-gradient(135deg, #0F52BA, #1E3A8A);
      color: #FFFFFF;
      padding: 36px;
      border-radius: 12px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 36px;
    }
    .eval-score-wrap {
      display: flex;
      align-items: baseline;
      gap: 16px;
    }
    .eval-score-num {
      font-size: 64px;
      font-weight: 900;
      color: #FBBF24;
      line-height: 1;
    }
    .eval-score-text h3 {
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 4px;
    }
    .eval-stars {
      color: #FBBF24;
      font-size: 20px;
      letter-spacing: 2px;
    }
    .table-responsive {
      overflow-x: auto;
      background: #FFFFFF;
      border-radius: 10px;
      border: 1px solid var(--border);
    }
    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }
    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border);
      font-size: 14px;
    }
    .eval-table th {
      background: #F8FAFC;
      color: var(--dark);
      font-weight: 800;
    }
    .eval-table tr:last-child td {
      border-bottom: none;
    }
    .eval-highlight {
      background: #EFF6FF;
      color: var(--primary);
      font-weight: 700;
    }

    /* 案例展示 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .case-card {
      background: #FFFFFF;
      border-radius: 10px;
      border: 1px solid var(--border);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }
    .case-img-wrap {
      width: 100%;
      height: 200px;
      background: #E2E8F0;
      display: flex;
      align-items: center;
      justify-content: center;
      overflow: hidden;
    }
    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s;
    }
    .case-card:hover .case-img-wrap img {
      transform: scale(1.04);
    }
    .case-body {
      padding: 20px;
      flex-grow: 1;
    }
    .case-title {
      font-size: 17px;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 8px;
    }
    .case-desc {
      font-size: 13px;
      color: #6B7280;
      line-height: 1.6;
    }

    /* 流程步骤 */
    .steps-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .step-box {
      background: #FFFFFF;
      padding: 24px;
      border-radius: 10px;
      border: 1px solid var(--border);
      position: relative;
      border-top: 4px solid var(--accent);
    }
    .step-idx {
      font-size: 32px;
      font-weight: 900;
      color: #E2E8F0;
      line-height: 1;
      margin-bottom: 12px;
    }
    .step-h {
      font-size: 17px;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 8px;
    }
    .step-p {
      font-size: 13px;
      color: #6B7280;
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .review-card {
      background: #FFFFFF;
      padding: 24px;
      border-radius: 10px;
      border: 1px solid var(--border);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-content {
      font-size: 14px;
      color: #374151;
      font-style: italic;
      margin-bottom: 20px;
      line-height: 1.7;
    }
    .reviewer {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border);
      padding-top: 14px;
    }
    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 15px;
    }
    .reviewer-info h4 {
      font-size: 14px;
      font-weight: 800;
      color: var(--dark);
    }
    .reviewer-info p {
      font-size: 12px;
      color: #6B7280;
    }

    /* 常见问题折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: 8px;
      overflow: hidden;
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 700;
      color: var(--dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-question:hover {
      background: #F8FAFC;
    }
    .faq-toggle-icon {
      font-size: 18px;
      font-weight: 400;
      color: var(--accent);
      transition: transform 0.2s;
    }
    .faq-answer {
      padding: 0 24px 18px;
      font-size: 14px;
      color: #4B5563;
      line-height: 1.7;
      display: none;
      border-top: 1px dashed var(--border);
      margin-top: 8px;
      padding-top: 12px;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }

    /* 需求表单与联系方式 */
    .contact-form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #FFFFFF;
      padding: 40px;
      border-radius: 12px;
      border: 1px solid var(--border);
    }
    .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: 700;
      color: var(--dark);
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 14px;
      background: #F8FAFC;
      color: var(--dark);
      outline: none;
      transition: border-color 0.2s;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      background: #FFFFFF;
    }
    .btn-submit {
      background: var(--accent);
      color: #FFFFFF;
      border: none;
      padding: 14px 28px;
      font-size: 16px;
      font-weight: 800;
      border-radius: 6px;
      cursor: pointer;
      box-shadow: 0 4px 0 #C22F0E;
      transition: transform 0.1s;
      align-self: flex-start;
    }
    .btn-submit:hover {
      transform: translateY(-2px);
    }
    .contact-info-panel {
      background: #EFF6FF;
      padding: 32px;
      border-radius: 8px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .contact-info-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .contact-info-item {
      display: flex;
      align-items: flex-start;
      gap: 12px;
    }
    .contact-info-item strong {
      color: var(--dark);
      min-width: 80px;
      font-size: 14px;
    }
    .contact-info-item span, .contact-info-item a {
      color: #4B5563;
      font-size: 14px;
    }
    .contact-qr {
      margin-top: 20px;
      text-align: center;
      background: #FFFFFF;
      padding: 16px;
      border-radius: 8px;
      display: inline-block;
      align-self: flex-start;
      border: 1px solid #BFDBFE;
    }
    .contact-qr img {
      width: 130px;
      height: 130px;
      display: block;
      margin: 0 auto 8px;
    }
    .contact-qr p {
      font-size: 12px;
      font-weight: 700;
      color: var(--primary);
    }

    /* 资讯与友情链接 */
    .articles-links-box {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 32px;
    }
    .articles-block, .links-block {
      background: #FFFFFF;
      padding: 24px;
      border-radius: 8px;
      border: 1px solid var(--border);
    }
    .block-h3 {
      font-size: 18px;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 16px;
      border-bottom: 2px solid var(--secondary);
      padding-bottom: 8px;
    }
    .article-anchors {
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .article-anchors a {
      font-size: 14px;
      color: #374151;
      display: flex;
      align-items: center;
      gap: 8px;
      transition: color 0.2s;
    }
    .article-anchors a:hover {
      color: var(--accent);
    }
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .friend-links-box a {
      display: inline-block;
      background: #F1F5F9;
      color: #4B5563;
      padding: 6px 14px;
      border-radius: 4px;
      font-size: 13px;
      font-weight: 600;
      transition: all 0.2s;
    }
    .friend-links-box a:hover {
      background: var(--primary);
      color: #FFFFFF;
    }

    /* 底部 Footer */
    footer {
      background: #0B192C;
      color: #E2E8F0;
      padding: 48px 0 24px;
      font-size: 14px;
    }
    .footer-top {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding-bottom: 24px;
      border-bottom: 1px solid rgba(255,255,255,0.1);
      margin-bottom: 24px;
      flex-wrap: wrap;
      gap: 16px;
    }
    .footer-logo {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .footer-logo img {
      max-height: 38px;
      
    }
    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      color: #94A3B8;
      font-size: 13px;
    }

    /* 浮动客服 */
    .floating-widget {
      position: fixed;
      bottom: 30px;
      right: 20px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 50px;
      height: 50px;
      background: var(--accent);
      color: #FFFFFF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 13px;
      font-weight: 800;
      box-shadow: 0 4px 12px rgba(255, 90, 54, 0.4);
      cursor: pointer;
      border: 2px solid #FFFFFF;
      transition: transform 0.2s;
    }
    .float-btn:hover {
      transform: scale(1.08);
    }
    .float-btn.back-top {
      background: var(--primary);
      box-shadow: 0 4px 12px rgba(15, 82, 186, 0.4);
      display: none;
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .services-grid, .cases-grid, .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .steps-row, .hero-metrics {
        grid-template-columns: repeat(2, 1fr);
      }
      .platform-intro-grid, .contact-form-grid, .articles-links-box {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 32px;
      }
    }
    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        padding: 16px 20px;
        border-bottom: 2px solid var(--primary);
        box-shadow: 0 10px 15px rgba(0,0,0,0.1);
      }
      .nav-links.show {
        display: flex;
      }
      .services-grid, .cases-grid, .reviews-grid, .steps-row, .hero-metrics {
        grid-template-columns: 1fr;
      }
      .eval-banner {
        flex-direction: column;
        text-align: center;
        gap: 20px;
      }
      .eval-score-wrap {
        flex-direction: column;
        gap: 8px;
      }
      .hero-section {
        padding: 50px 0 40px;
      }
      .hero-title {
        font-size: 26px;
      }
      .contact-form-grid {
        padding: 20px;
      }
    }