:root {
      --primary: #ff5722;
      --primary-hover: #f4511e;
      --primary-light: #fff3e0;
      --primary-gradient: linear-gradient(135deg, #ff6f00 0%, #ff3d00 100%);
      --accent-warm: #ffe0b2;
      --text-main: #212121;
      --text-muted: #616161;
      --text-light: #757575;
      --bg-page: #fbfbfd;
      --bg-surface: #ffffff;
      --bg-surface-alt: #f8f9fa;
      --border-color: #f0e6e0;
      --border-focus: #ffab91;
      --shadow-sm: 0 2px 8px rgba(255, 87, 34, 0.08);
      --shadow-md: 0 8px 24px rgba(255, 87, 34, 0.12);
      --shadow-lg: 0 16px 36px rgba(230, 81, 0, 0.16);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --container-width: 1200px;
    }

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

    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-page);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

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

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

    .container {
      width: 100%;
      max-width: var(--container-width);
      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: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

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

    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .brand-text {
      font-size: 1.25rem;
      font-weight: 800;
      color: #bf360c;
      letter-spacing: -0.5px;
    }

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

    .nav-links a {
      display: block;
      padding: 8px 14px;
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }

    .nav-links a:hover,
    .nav-links a.active {
      color: var(--primary);
      background-color: var(--primary-light);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      text-align: center;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(255, 87, 34, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 87, 34, 0.45);
    }

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

    .btn-outline:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 6px;
    }

    /* 首屏 Hero 无图区域 */
    .hero-section {
      background: radial-gradient(circle at 80% 20%, #ffebe0 0%, #fff7f2 50%, #ffffff 100%);
      padding: 80px 0 60px;
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }

    .hero-section::after {
      content: "";
      position: absolute;
      width: 400px;
      height: 400px;
      background: radial-gradient(circle, rgba(255, 87, 34, 0.08) 0%, rgba(255, 255, 255, 0) 70%);
      top: -100px;
      right: -100px;
      border-radius: 50%;
      pointer-events: none;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content .badge {
      display: inline-block;
      padding: 6px 16px;
      background-color: var(--primary-light);
      color: #d84315;
      font-size: 0.88rem;
      font-weight: 700;
      border-radius: 30px;
      margin-bottom: 20px;
      border: 1px solid #ffccbc;
    }

    .hero-title {
      font-size: 2.5rem;
      line-height: 1.25;
      font-weight: 900;
      color: #212121;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      color: var(--primary);
    }

    .hero-desc {
      font-size: 1.12rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 32px;
    }

    .hero-btns {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 36px;
    }

    .hero-feature-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    .feature-tag-item {
      display: inline-flex;
      align-items: center;
      padding: 6px 12px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    .hero-tech-card {
      background: #ffffff;
      border: 1px solid #ffd0b0;
      border-radius: var(--radius-lg);
      padding: 30px;
      box-shadow: var(--shadow-md);
      position: relative;
    }

    .tech-badge-hot {
      position: absolute;
      top: -12px;
      right: 24px;
      background: #e65100;
      color: #ffffff;
      font-size: 0.75rem;
      padding: 3px 10px;
      border-radius: 12px;
      font-weight: 700;
    }

    .hero-tech-card h3 {
      font-size: 1.2rem;
      margin-bottom: 16px;
      color: #d84315;
    }

    .model-tags-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-bottom: 24px;
    }

    .model-chip {
      padding: 5px 11px;
      background: #fff8f5;
      border: 1px solid #ffccbc;
      border-radius: 4px;
      font-size: 0.8rem;
      font-weight: 600;
      color: #bf360c;
    }

    .tech-metric-bar {
      border-top: 1px dashed var(--border-color);
      padding-top: 16px;
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      text-align: center;
      gap: 10px;
    }

    .metric-val {
      font-size: 1.4rem;
      font-weight: 800;
      color: var(--primary);
    }

    .metric-name {
      font-size: 0.78rem;
      color: var(--text-light);
    }

    /* 区域通用结构 */
    .section-wrap {
      padding: 72px 0;
      border-bottom: 1px solid var(--border-color);
      background-color: var(--bg-surface);
    }

    .section-wrap-alt {
      background-color: var(--bg-surface-alt);
    }

    .section-head {
      text-align: center;
      max-width: 780px;
      margin: 0 auto 48px;
    }

    .section-eyebrow {
      display: inline-block;
      color: var(--primary);
      font-weight: 700;
      font-size: 0.9rem;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.3;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 网格布局 */
    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 32px;
    }

    /* 服务与能力卡片 */
    .feature-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--border-focus);
    }

    .card-icon-box {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      font-weight: 800;
      margin-bottom: 18px;
    }

    .feature-card h3 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: #212121;
    }

    .feature-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 流程步骤 */
    .step-node {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      position: relative;
    }

    .step-order {
      font-size: 1.8rem;
      font-weight: 900;
      color: #ffab91;
      line-height: 1;
      margin-bottom: 12px;
    }

    .step-node h4 {
      font-size: 1.1rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }

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

    /* 对比评测专属样式 */
    .eval-highlight-box {
      background: #fff8f5;
      border: 2px solid #ffccbc;
      border-radius: var(--radius-lg);
      padding: 32px;
      margin-bottom: 36px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
    }

    .eval-score-wrap {
      display: flex;
      align-items: center;
      gap: 24px;
    }

    .score-circle {
      width: 90px;
      height: 90px;
      background: var(--primary-gradient);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 16px rgba(255, 87, 34, 0.4);
    }

    .score-circle .score-num {
      font-size: 1.8rem;
      font-weight: 900;
      line-height: 1;
    }

    .score-circle .score-max {
      font-size: 0.75rem;
      opacity: 0.9;
    }

    .eval-meta h3 {
      font-size: 1.35rem;
      color: #d84315;
      margin-bottom: 6px;
    }

    .eval-stars {
      color: #ff9800;
      font-size: 1.1rem;
      font-weight: bold;
    }

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

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

    .custom-table th,
    .custom-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.92rem;
    }

    .custom-table th {
      background-color: #fff3e0;
      color: #bf360c;
      font-weight: 700;
    }

    .custom-table tr:hover {
      background-color: #fffbf9;
    }

    .cell-strong {
      color: var(--primary);
      font-weight: 700;
    }

    /* 客户评价卡片 */
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-body {
      font-size: 0.92rem;
      color: var(--text-main);
      line-height: 1.6;
      margin-bottom: 16px;
      position: relative;
    }

    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f5f5f5;
      padding-top: 12px;
    }

    .author-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .author-info h5 {
      font-size: 0.92rem;
      color: var(--text-main);
    }

    .author-info p {
      font-size: 0.78rem;
      color: var(--text-light);
    }

    /* FAQ 手风琴 */
    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

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

    .faq-header {
      padding: 18px 22px;
      font-size: 1rem;
      font-weight: 600;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
    }

    .faq-header:hover {
      background-color: #fffaf7;
      color: var(--primary);
    }

    .faq-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.25s ease;
    }

    .faq-body {
      padding: 0 22px 18px;
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      display: none;
    }

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

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

    /* 表单区域 */
    .form-box {
      background: #ffffff;
      border: 1px solid #ffd0b0;
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }

    .form-group {
      margin-bottom: 18px;
    }

    .form-label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid #dcdcdc;
      border-radius: var(--radius-sm);
      outline: none;
      transition: border 0.2s ease;
      background: #ffffff;
      color: var(--text-main);
    }

    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(255, 87, 34, 0.15);
    }

    textarea.form-control {
      min-height: 100px;
      resize: vertical;
    }

    /* 素材图展示容器 */
    .media-gallery-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 20px;
      margin-top: 30px;
    }

    .media-gallery-grid img {
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .banner-showcase-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 30px;
    }

    .banner-showcase-row img {
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      width: 100%;
      height: auto;
    }

    /* 文章列表与资讯 */
    .article-links-container {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .article-item {
      background: #ffffff;
      padding: 16px 20px;
      border-radius: var(--radius-sm);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      justify-content: space-between;
      transition: all 0.2s ease;
    }

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

    .article-title-text {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
    }

    /* 微信客服浮窗二维码区 */
    .contact-card-wrap {
      background: #fff8f5;
      border: 1px solid #ffccbc;
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
    }

    .kefu-qrcode-box {
      max-width: 160px;
      margin: 12px auto;
      border: 1px solid var(--border-color);
      padding: 6px;
      background: #ffffff;
      border-radius: var(--radius-sm);
    }

    /* 底部专属区 */
    .site-footer {
      background-color: #212121;
      color: #eceff1;
      padding: 60px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 36px;
      margin-bottom: 40px;
    }

    .footer-col h4 {
      color: #ffffff;
      font-size: 1.05rem;
      margin-bottom: 18px;
      position: relative;
    }

    .footer-col p {
      font-size: 0.88rem;
      color: #b0bec5;
      line-height: 1.6;
      margin-bottom: 10px;
    }

    .footer-links-list {
      list-style: none;
    }

    .footer-links-list li {
      margin-bottom: 8px;
    }

    .footer-links-list a {
      font-size: 0.88rem;
      color: #cfd8dc;
    }

    .footer-links-list a:hover {
      color: var(--primary);
      padding-left: 4px;
    }

    .friend-links-box {
      border-top: 1px solid #37474f;
      padding: 20px 0;
      margin-bottom: 20px;
    }

    .friend-links-box h5 {
      color: #b0bec5;
      font-size: 0.85rem;
      margin-bottom: 10px;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friend-links-list a {
      font-size: 0.82rem;
      color: #90a4ae;
    }

    .friend-links-list a:hover {
      color: var(--primary);
    }

    .footer-bottom {
      border-top: 1px solid #2d3748;
      padding-top: 20px;
      text-align: center;
      font-size: 0.82rem;
      color: #90a4ae;
    }

    /* 浮动操作快捷栏 */
    .floating-contact-panel {
      position: fixed;
      right: 20px;
      bottom: 80px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-icon-btn {
      width: 48px;
      height: 48px;
      background: var(--primary-gradient);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(255, 87, 34, 0.4);
      cursor: pointer;
      border: none;
      font-weight: 700;
      font-size: 0.85rem;
      transition: transform 0.2s ease;
    }

    .float-icon-btn:hover {
      transform: scale(1.08);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-grid {
        grid-template-columns: 1fr;
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: 1fr;
      }
      .grid-2 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .media-gallery-grid {
        grid-template-columns: 1fr;
      }
      .banner-showcase-row {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.show {
        display: flex;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .grid-4 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .eval-highlight-box {
        flex-direction: column;
        align-items: flex-start;
      }
    }