:root {
      --primary: #FF5E00;
      --primary-hover: #E05200;
      --primary-light: #FFF2EB;
      --accent: #FF8C00;
      --dark: #1F2429;
      --text: #333A42;
      --text-muted: #667085;
      --border: #EAECEF;
      --bg: #FAFBFC;
      --card-bg: #FFFFFF;
      --shadow-sm: 0 2px 6px rgba(255, 94, 0, 0.05);
      --shadow: 0 8px 24px rgba(27, 31, 35, 0.08);
      --shadow-lg: 0 16px 36px rgba(255, 94, 0, 0.12);
      --radius: 10px;
      --transition: all 0.25s ease-in-out;
    }
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
      background-color: var(--bg);
      color: var(--text);
    }
    body {
      line-height: 1.6;
      background-color: var(--bg);
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: var(--transition);
    }
    .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, 0.96);
      border-bottom: 1px solid var(--border);
      backdrop-filter: blur(10px);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap img {
      max-height: 40px;
      width: auto;
      display: block;
    }
    .brand-name {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }
    .nav-links a {
      font-size: 14px;
      color: var(--text);
      font-weight: 500;
      padding: 8px 12px;
      border-radius: 6px;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
      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 22px;
      font-size: 14px;
      font-weight: 600;
      border-radius: 6px;
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
    }
    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 4px 12px rgba(255, 94, 0, 0.25);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      color: #FFFFFF;
      transform: translateY(-2px);
    }
    .btn-outline {
      border-color: var(--primary);
      color: var(--primary);
      background: transparent;
    }
    .btn-outline:hover {
      background-color: var(--primary-light);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--dark);
      cursor: pointer;
    }
    /* Hero首屏 (纯代码与几何修饰，不含图片) */
    .hero-section {
      padding: 90px 0 70px;
      background: linear-gradient(135deg, #FFFFFF 0%, #FFF7F2 100%);
      border-bottom: 1px solid var(--border);
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: var(--primary-light);
      border: 1px solid #FFE0D1;
      color: var(--primary);
      border-radius: 30px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 38px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 20px;
    }
    .hero-title span {
      color: var(--primary);
    }
    .hero-desc {
      font-size: 17px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
    }
    .hero-actions {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
    }
    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }
    .metric-card {
      background: #FFFFFF;
      padding: 20px 16px;
      border-radius: var(--radius);
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
    }
    .metric-number {
      font-size: 26px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .metric-label {
      font-size: 13px;
      color: var(--text-muted);
    }
    /* 公共区段骨架 */
    .section-spacing {
      padding: 80px 0;
    }
    .section-header {
      text-align: center;
      max-width: 700px;
      margin: 0 auto 50px;
    }
    .section-tag {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--primary);
      margin-bottom: 8px;
      display: block;
    }
    .section-title {
      font-size: 30px;
      font-weight: 800;
      color: var(--dark);
      margin-bottom: 14px;
    }
    .section-subtitle {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    /* 网格卡片体系 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .card {
      background: var(--card-bg);
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      transition: var(--transition);
      position: relative;
    }
    .card:hover {
      box-shadow: var(--shadow);
      transform: translateY(-4px);
      border-color: #FFD2BC;
    }
    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      background: var(--primary-light);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 10px;
    }
    .card-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }
    /* 平台介绍 */
    .about-box {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }
    .about-features {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      margin-top: 30px;
    }
    .about-feature-item {
      border-left: 3px solid var(--primary);
      padding-left: 16px;
    }
    .about-feature-item h3 {
      font-size: 16px;
      font-weight: 700;
      color: var(--dark);
      margin-bottom: 6px;
    }
    .about-feature-item p {
      font-size: 13px;
      color: var(--text-muted);
    }
    /* 模型云标签 */
    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }
    .model-tag {
      background: #FFFFFF;
      border: 1px solid var(--border);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      color: var(--dark);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .model-tag:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: scale(1.04);
    }
    /* 流程步骤 */
    .steps-wrapper {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }
    .step-card {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
    }
    .step-badge {
      font-size: 28px;
      font-weight: 900;
      color: rgba(255, 94, 0, 0.2);
      position: absolute;
      top: 16px;
      right: 16px;
    }
    /* 媒体与案例展示区 */
    .media-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-bottom: 40px;
    }
    .media-card {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      overflow: hidden;
    }
    .media-card img {
      width: 100%;
      height: 220px;
      object-fit: cover;
      display: block;
    }
    .media-info {
      padding: 20px;
    }
    .banner-gallery {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }
    .banner-item {
      border-radius: 8px;
      overflow: hidden;
      border: 1px solid var(--border);
    }
    .banner-item img {
      width: 100%;
      height: 140px;
      object-fit: cover;
      display: block;
    }
    /* 对比评测表格 */
    .evaluation-wrapper {
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }
    .eval-score-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: var(--primary-light);
      padding: 16px 24px;
      border-radius: 8px;
      margin-bottom: 24px;
    }
    .eval-rating {
      font-size: 20px;
      font-weight: 800;
      color: var(--primary);
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
    }
    table.custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    table.custom-table th, table.custom-table td {
      padding: 14px 16px;
      border-bottom: 1px solid var(--border);
      font-size: 14px;
    }
    table.custom-table th {
      background: #F4F6F8;
      color: var(--dark);
      font-weight: 700;
    }
    table.custom-table td.highlight {
      color: var(--primary);
      font-weight: 600;
    }
    /* 折叠FAQ */
    .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 20px;
      font-size: 16px;
      font-weight: 600;
      color: var(--dark);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .faq-question::after {
      content: "+";
      font-size: 20px;
      color: var(--primary);
      transition: transform 0.2s;
    }
    .faq-item.active .faq-question::after {
      transform: rotate(45deg);
    }
    .faq-answer {
      padding: 0 20px 18px;
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      display: none;
    }
    .faq-item.active .faq-answer {
      display: block;
    }
    /* 表单区域 */
    .form-wrapper {
      max-width: 680px;
      margin: 0 auto;
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--dark);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border);
      border-radius: 6px;
      font-size: 14px;
      color: var(--dark);
      outline: none;
      transition: var(--transition);
      background: #FFFFFF;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(255, 94, 0, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }
    /* 资讯与友情链接 */
    .links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }
    .links-list a {
      font-size: 13px;
      padding: 6px 14px;
      background: #FFFFFF;
      border: 1px solid var(--border);
      border-radius: 4px;
      color: var(--text);
    }
    .links-list a:hover {
      border-color: var(--primary);
      color: var(--primary);
    }
    /* 页脚 */
    .site-footer {
      background: #FFFFFF;
      border-top: 1px solid var(--border);
      padding: 60px 0 30px;
      color: var(--text-muted);
      font-size: 14px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-col h4 {
      font-size: 15px;
      color: var(--dark);
      margin-bottom: 16px;
      font-weight: 700;
    }
    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-col a:hover {
      color: var(--primary);
    }
    .footer-qrcode-wrap {
      display: flex;
      gap: 16px;
      align-items: center;
    }
    .footer-qrcode-wrap img {
      width: 88px;
      height: 88px;
      border: 1px solid var(--border);
      border-radius: 6px;
      display: block;
    }
    .footer-bottom {
      border-top: 1px solid var(--border);
      padding-top: 24px;
      text-align: center;
      font-size: 13px;
    }
    /* 浮动客服 */
    .floating-service {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .service-btn {
      width: 48px;
      height: 48px;
      background: var(--primary);
      color: #FFFFFF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 14px rgba(255, 94, 0, 0.35);
      cursor: pointer;
      border: none;
      position: relative;
    }
    .service-qr-pop {
      position: absolute;
      right: 60px;
      bottom: 0;
      background: #FFFFFF;
      border: 1px solid var(--border);
      padding: 12px;
      border-radius: 8px;
      box-shadow: var(--shadow);
      display: none;
      text-align: center;
      width: 140px;
    }
    .service-qr-pop img {
      width: 116px;
      height: 116px;
      display: block;
      margin: 0 auto 6px;
    }
    .service-qr-pop span {
      font-size: 12px;
      color: var(--dark);
      font-weight: 600;
    }
    .service-btn:hover .service-qr-pop {
      display: block;
    }
    /* 响应式调整 */
    @media (max-width: 992px) {
      .grid-3, .about-features, .steps-wrapper {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4, .hero-metrics, .banner-gallery {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .nav-links {
        display: none;
      }
      .nav-links.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow);
      }
      .mobile-toggle {
        display: block;
      }
    }
    @media (max-width: 600px) {
      .grid-3, .grid-4, .about-features, .steps-wrapper, .media-grid, .hero-metrics, .banner-gallery, .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 26px;
      }
      .hero-actions {
        flex-direction: column;
      }
    }