:root {
      --primary-orange: #ff5722;
      --deep-orange: #e64a19;
      --flame-amber: #ff9800;
      --accent-glow: rgba(255, 87, 34, 0.12);
      --bg-warm-light: #fffaf7;
      --bg-pure-white: #ffffff;
      --text-main: #1f2429;
      --text-muted: #5a626a;
      --text-light: #8c96a0;
      --border-color: #f3dfd5;
      --card-shadow: 0 10px 30px rgba(230, 74, 25, 0.07);
      --card-shadow-hover: 0 16px 36px rgba(230, 74, 25, 0.15);
      --container-width: 1200px;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --transition: all 0.28s ease;
    }

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

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-warm-light);
      color: var(--text-main);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
    }

    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      z-index: 1000;
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-logo-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 20px;
      font-weight: 700;
      color: var(--deep-orange);
    }
    .brand-logo-wrap img {
      height: 38px;
      width: auto;
      display: block;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      padding: 8px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      transition: var(--transition);
      display: block;
    }
    .nav-links li a:hover {
      color: var(--primary-orange);
    }
    .header-actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-nav {
      padding: 8px 18px;
      font-size: 14px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: var(--transition);
    }
    .btn-nav-light {
      background: #fff;
      color: var(--primary-orange);
      border: 1px solid var(--primary-orange);
    }
    .btn-nav-light:hover {
      background: var(--accent-glow);
    }
    .btn-nav-primary {
      background: linear-gradient(135deg, var(--flame-amber), var(--primary-orange));
      color: #fff;
      box-shadow: 0 4px 12px rgba(255, 87, 34, 0.25);
    }
    .btn-nav-primary:hover {
      box-shadow: 0 6px 16px rgba(255, 87, 34, 0.4);
      transform: translateY(-1px);
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 区域通用结构 */
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }
    .section-wrap.alt-bg {
      background: #fff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }
    .section-tag {
      display: inline-block;
      padding: 4px 12px;
      background: rgba(255, 87, 34, 0.1);
      color: var(--deep-orange);
      font-size: 13px;
      font-weight: 600;
      border-radius: 20px;
      margin-bottom: 12px;
      text-transform: uppercase;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.35;
      margin-bottom: 14px;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 首屏 Hero (无图片，纯色/渐变/几何块/动效/卡片) */
    .hero-section {
      padding: 90px 0 70px;
      background: radial-gradient(circle at 80% 20%, rgba(255, 152, 0, 0.15) 0%, rgba(255, 250, 247, 0) 60%),
                  radial-gradient(circle at 20% 80%, rgba(255, 87, 34, 0.1) 0%, rgba(255, 250, 247, 0) 50%);
    }
    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: 30px;
      font-size: 14px;
      color: var(--deep-orange);
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(255, 87, 34, 0.08);
      margin-bottom: 24px;
    }
    .hero-badge .dot {
      width: 8px;
      height: 8px;
      background: var(--primary-orange);
      border-radius: 50%;
      display: inline-block;
      box-shadow: 0 0 0 3px rgba(255, 87, 34, 0.2);
    }
    .hero-title {
      font-size: 44px;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-title .highlight {
      color: var(--primary-orange);
    }
    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
    }
    .hero-btn-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 48px;
    }
    .btn-hero-primary {
      padding: 14px 34px;
      font-size: 16px;
      font-weight: 700;
      border-radius: var(--radius-sm);
      background: linear-gradient(135deg, #ff6b3d, #ff3d00);
      color: #fff;
      box-shadow: 0 8px 24px rgba(255, 61, 0, 0.3);
      transition: var(--transition);
      display: inline-flex;
      align-items: center;
      gap: 8px;
    }
    .btn-hero-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 28px rgba(255, 61, 0, 0.4);
    }
    .btn-hero-secondary {
      padding: 14px 30px;
      font-size: 16px;
      font-weight: 600;
      border-radius: var(--radius-sm);
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid #e2e8f0;
      box-shadow: 0 4px 12px rgba(0,0,0,0.03);
      transition: var(--transition);
    }
    .btn-hero-secondary:hover {
      border-color: var(--primary-orange);
      color: var(--primary-orange);
    }
    
    /* 核心数据指标卡片 */
    .metric-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 10px;
    }
    .metric-card {
      background: #fff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      text-align: center;
      transition: var(--transition);
    }
    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .metric-number {
      font-size: 32px;
      font-weight: 800;
      color: var(--deep-orange);
      margin-bottom: 6px;
    }
    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台介绍 & 服务能力卡片 */
    .cards-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }
    .feature-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--card-shadow);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .feature-card:hover {
      border-color: var(--flame-amber);
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .card-icon-pill {
      width: 44px;
      height: 44px;
      background: var(--accent-glow);
      color: var(--deep-orange);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .feature-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .feature-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 标签云 (模型支持) */
    .model-tags-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      max-width: 960px;
      margin: 30px auto 0;
    }
    .model-chip {
      background: #fff;
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 500;
      color: var(--text-main);
      box-shadow: 0 2px 6px rgba(0,0,0,0.02);
      transition: var(--transition);
    }
    .model-chip:hover {
      background: var(--deep-orange);
      color: #fff;
      border-color: var(--deep-orange);
    }

    /* 案例展示区 */
    .gallery-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
      gap: 20px;
      margin-top: 30px;
    }
    .gallery-item {
      background: #fff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: var(--transition);
    }
    .gallery-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--card-shadow-hover);
    }
    .gallery-img-box {
      width: 100%;
      overflow: hidden;
      background: #eee;
      aspect-ratio: 16/9;
    }
    .gallery-img-box.square {
      aspect-ratio: 1/1;
    }
    .gallery-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
      transition: transform 0.4s ease;
    }
    .gallery-item:hover .gallery-img-box img {
      transform: scale(1.05);
    }
    .gallery-caption {
      padding: 16px;
    }
    .gallery-caption h4 {
      font-size: 16px;
      font-weight: 600;
      margin-bottom: 4px;
      color: var(--text-main);
    }
    .gallery-caption p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 标准流程时间线 */
    .timeline-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
      margin-top: 30px;
    }
    .step-card {
      background: #fff;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      position: relative;
    }
    .step-idx {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary-orange);
      opacity: 0.3;
      margin-bottom: 12px;
    }
    .step-card h3 {
      font-size: 17px;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-card p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 对比评测表格 */
    .compare-container {
      background: #fff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      padding: 30px;
      overflow-x: auto;
    }
    .rating-badge-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: rgba(255, 87, 34, 0.08);
      padding: 16px 24px;
      border-radius: var(--radius-md);
      margin-bottom: 24px;
    }
    .rating-score-box {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .rating-stars {
      color: #ff9800;
      font-size: 20px;
      letter-spacing: 2px;
    }
    .rating-val {
      font-size: 22px;
      font-weight: 800;
      color: var(--deep-orange);
    }
    .rating-tip {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
    }
    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .compare-table th, .compare-table td {
      padding: 14px 18px;
      border-bottom: 1px solid var(--border-color);
      font-size: 14px;
    }
    .compare-table th {
      background: #fafafa;
      color: var(--text-main);
      font-weight: 700;
    }
    .compare-table tr:last-child td {
      border-bottom: none;
    }
    .highlight-cell {
      background: rgba(255, 87, 34, 0.04);
      color: var(--deep-orange);
      font-weight: 600;
    }

    /* 用户评论 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
      margin-top: 30px;
    }
    .review-card {
      background: #fff;
      padding: 26px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-text {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
      font-style: italic;
    }
    .reviewer-meta {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .reviewer-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--flame-amber), var(--primary-orange));
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
    }
    .reviewer-name {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }
    .reviewer-role {
      font-size: 12px;
      color: var(--text-light);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 0 2px 8px rgba(0,0,0,0.02);
      transition: var(--transition);
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 16px;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }
    .faq-question:hover {
      color: var(--primary-orange);
    }
    .faq-toggle-icon {
      font-size: 18px;
      transition: transform 0.25s ease;
      color: var(--text-light);
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
      color: var(--primary-orange);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #fffdfb;
      padding: 0 24px;
    }
    .faq-item.active .faq-answer {
      padding: 0 24px 20px;
    }
    .faq-answer p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 需求提交表单 */
    .form-box {
      max-width: 720px;
      margin: 0 auto;
      background: #fff;
      padding: 40px;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
    }
    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 20px;
    }
    .form-group.full-width {
      grid-column: span 2;
    }
    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 14px;
      outline: none;
      transition: var(--transition);
      background: #fff;
    }
    .form-control:focus {
      border-color: var(--primary-orange);
      box-shadow: 0 0 0 3px rgba(255, 87, 34, 0.12);
    }
    .btn-submit {
      width: 100%;
      padding: 14px;
      background: linear-gradient(135deg, var(--flame-amber), var(--deep-orange));
      color: #fff;
      font-size: 16px;
      font-weight: 700;
      border: none;
      border-radius: var(--radius-sm);
      cursor: pointer;
      box-shadow: 0 6px 18px rgba(230, 74, 25, 0.25);
      transition: var(--transition);
      margin-top: 10px;
    }
    .btn-submit:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 24px rgba(230, 74, 25, 0.35);
    }

    /* 行业资讯与最新文章 */
    .articles-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 20px;
      margin-top: 20px;
    }
    .article-card {
      background: #fff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      box-shadow: var(--card-shadow);
      display: block;
      transition: var(--transition);
    }
    .article-card:hover {
      border-color: var(--primary-orange);
      transform: translateY(-3px);
    }
    .article-card h4 {
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .article-card p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 底部页脚 */
    .site-footer {
      background: #191b1f;
      color: #b0b8c1;
      padding: 60px 0 30px;
      border-top: 1px solid #2d3239;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 30px;
      margin-bottom: 40px;
    }
    .footer-col h5 {
      font-size: 16px;
      font-weight: 700;
      color: #fff;
      margin-bottom: 18px;
    }
    .footer-col p {
      font-size: 13px;
      line-height: 1.8;
      color: #a0abb6;
      margin-bottom: 10px;
    }
    .footer-links {
      list-style: none;
    }
    .footer-links li {
      margin-bottom: 10px;
    }
    .footer-links a {
      font-size: 13px;
      color: #a0abb6;
      transition: var(--transition);
    }
    .footer-links a:hover {
      color: var(--flame-amber);
    }
    .qr-box {
      display: flex;
      align-items: center;
      gap: 16px;
      background: #23272d;
      padding: 12px;
      border-radius: var(--radius-sm);
    }
    .qr-box img {
      width: 80px;
      height: 80px;
      border-radius: 4px;
      background: #fff;
      display: block;
    }
    .qr-info {
      font-size: 12px;
      color: #a0abb6;
    }
    .friend-links-box {
      border-top: 1px solid #2d3239;
      padding-top: 24px;
      margin-bottom: 24px;
    }
    .friend-links-box span {
      font-size: 13px;
      font-weight: 600;
      color: #fff;
      margin-right: 12px;
    }
    .friend-links-box a {
      font-size: 13px;
      color: #8c96a0;
      margin-right: 16px;
      display: inline-block;
      margin-bottom: 6px;
      transition: var(--transition);
    }
    .friend-links-box a:hover {
      color: var(--primary-orange);
    }
    .footer-bottom {
      border-top: 1px solid #2d3239;
      padding-top: 20px;
      text-align: center;
      font-size: 13px;
      color: #717d8a;
    }

    /* 浮动客服入口 */
    .float-kefu {
      position: fixed;
      right: 24px;
      bottom: 30px;
      background: linear-gradient(135deg, var(--flame-amber), var(--deep-orange));
      color: #fff;
      padding: 12px 18px;
      border-radius: 30px;
      box-shadow: 0 8px 24px rgba(255, 87, 34, 0.4);
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      font-weight: 700;
      z-index: 999;
      cursor: pointer;
      transition: var(--transition);
    }
    .float-kefu:hover {
      transform: translateY(-3px);
      box-shadow: 0 12px 28px rgba(255, 87, 34, 0.5);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .metric-grid, .timeline-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-title {
        font-size: 34px;
      }
    }
    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        padding: 16px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
      .metric-grid, .timeline-steps {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full-width {
        grid-column: span 1;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 28px;
      }
      .section-title {
        font-size: 24px;
      }
    }