:root {
      --primary: #FF5E00;
      --primary-hover: #E05200;
      --primary-light: #FFF2EB;
      --primary-gradient: linear-gradient(135deg, #FF7700 0%, #FF3D00 100%);
      --accent: #FF9900;
      --text-main: #1C2024;
      --text-sub: #4E5664;
      --text-muted: #798292;
      --bg-main: #FDFDFD;
      --bg-sub: #F7F8FA;
      --bg-warm: #FFF9F5;
      --border-color: #ECEEF2;
      --border-warm: #FFE4D6;
      --card-bg: #FFFFFF;
      --shadow-sm: 0 2px 8px rgba(255, 94, 0, 0.04);
      --shadow-md: 0 8px 24px rgba(255, 94, 0, 0.08);
      --shadow-lg: 0 16px 36px rgba(255, 94, 0, 0.12);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 18px;
      --container-width: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-font-smoothing: antialiased;
    }

    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: 15px;
      overflow-x: hidden;
    }

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

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

    .ai-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(10px);
      border-bottom: 1px solid var(--border-color);
      transition: box-shadow 0.3s ease;
    }

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

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

    .ai-page-logo {
      height: 40px;
      width: auto;
    }

    .brand-title {
      font-size: 20px;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

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

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

    .nav-links li a:hover {
      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: 14px;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      text-align: center;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(255, 94, 0, 0.28);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(255, 94, 0, 0.36);
      color: #FFFFFF;
    }

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

    .btn-outline:hover {
      background: var(--primary-light);
      color: var(--primary-hover);
    }

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

    /* 纯色科技感首屏 Hero (严禁图片) */
    .hero-section {
      background: linear-gradient(180deg, #FFF6F0 0%, #FFFFFF 100%);
      padding: 64px 0 60px;
      position: relative;
      overflow: hidden;
      border-bottom: 1px solid var(--border-color);
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
      position: relative;
      z-index: 2;
    }

    .badge-capsule {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: var(--primary-light);
      border: 1px solid var(--border-warm);
      border-radius: 30px;
      color: var(--primary);
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 20px;
    }

    .hero-title {
      font-size: 38px;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }

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

    .hero-desc {
      font-size: 17px;
      color: var(--text-sub);
      max-width: 760px;
      margin: 0 auto 30px;
      line-height: 1.7;
    }

    .hero-cta-group {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .hero-feature-tags {
      display: flex;
      justify-content: center;
      flex-wrap: wrap;
      gap: 12px;
    }

    .tag-item {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: 20px;
      font-size: 13px;
      color: var(--text-sub);
      box-shadow: var(--shadow-sm);
    }

    .tag-item b {
      color: var(--primary);
    }

    /* 数据指标条 */
    .metrics-bar {
      background: #FFFFFF;
      padding: 30px 0;
      border-bottom: 1px solid var(--border-color);
    }

    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      text-align: center;
    }

    .metric-card {
      padding: 16px;
      border-right: 1px solid var(--border-color);
    }

    .metric-card:last-child {
      border-right: none;
    }

    .metric-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 13px;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 通用Section布局 */
    .section-wrap {
      padding: 70px 0;
      position: relative;
    }

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

    .section-bg-warm {
      background-color: var(--bg-warm);
      border-top: 1px solid var(--border-warm);
      border-bottom: 1px solid var(--border-warm);
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 48px;
    }

    .section-tag {
      display: inline-block;
      color: var(--primary);
      font-size: 13px;
      font-weight: 700;
      letter-spacing: 1px;
      text-transform: uppercase;
      margin-bottom: 8px;
    }

    .section-title {
      font-size: 28px;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.35;
    }

    .section-subtitle {
      font-size: 15px;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 模型支持跑马灯/标签矩阵 */
    .model-pills-wrap {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-top: 24px;
    }

    .model-pill {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: var(--radius-sm);
      font-size: 13px;
      font-weight: 600;
      color: var(--text-sub);
      transition: all 0.2s ease;
    }

    .model-pill:hover {
      border-color: var(--primary);
      color: var(--primary);
      background-color: var(--primary-light);
    }

    /* 网格系统卡片 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .service-card {
      background: var(--card-bg);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

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

    .card-icon-box {
      width: 46px;
      height: 46px;
      background: var(--primary-light);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 800;
      font-size: 18px;
      margin-bottom: 16px;
    }

    .service-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }

    .service-card p {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.6;
      margin-bottom: 16px;
      flex-grow: 1;
    }

    .card-footer-meta {
      font-size: 12px;
      color: var(--primary);
      font-weight: 600;
      display: flex;
      align-items: center;
      gap: 4px;
    }

    /* 流程步骤 */
    .flow-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-item {
      background: #FFFFFF;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      position: relative;
    }

    .step-num {
      font-size: 28px;
      font-weight: 900;
      color: #FFD2B8;
      line-height: 1;
      margin-bottom: 12px;
    }

    .step-item h3 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .step-item p {
      font-size: 13px;
      color: var(--text-sub);
      line-height: 1.5;
    }

    /* 对比评测表格与卡片 */
    .review-score-panel {
      background: #FFFFFF;
      border: 1px solid var(--border-warm);
      border-radius: var(--radius-lg);
      padding: 32px;
      margin-bottom: 36px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
      flex-wrap: wrap;
      gap: 20px;
    }

    .score-badge {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .score-circle {
      width: 80px;
      height: 80px;
      background: var(--primary-gradient);
      color: #FFFFFF;
      border-radius: 50%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      font-weight: 900;
    }

    .score-circle .big {
      font-size: 26px;
      line-height: 1;
    }

    .score-circle .small {
      font-size: 11px;
      opacity: 0.9;
    }

    .score-text h3 {
      font-size: 20px;
      color: var(--text-main);
      margin-bottom: 4px;
    }

    .stars {
      color: #FF9900;
      font-size: 18px;
      letter-spacing: 2px;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      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-color: #F8F9FB;
      font-weight: 700;
      color: var(--text-main);
    }

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

    .highlight-col {
      background-color: #FFF9F5;
      color: var(--primary);
      font-weight: 700;
    }

    /* 宣传图与案例展示 (在首屏下方) */
    .media-gallery {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
      margin-top: 30px;
    }

    .gallery-card {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }

    .gallery-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }

    .gallery-card .img-box {
      width: 100%;
      aspect-ratio: 16/9;
      background-color: #EEE;
      overflow: hidden;
    }

    .gallery-card .img-box-square {
      aspect-ratio: 1/1;
    }

    .gallery-info {
      padding: 16px;
    }

    .gallery-info h4 {
      font-size: 15px;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }

    .gallery-info p {
      font-size: 13px;
      color: var(--text-sub);
    }

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

    .testimonial-body {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.65;
      margin-bottom: 16px;
      font-style: italic;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }

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

    .user-meta h4 {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }

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

    /* FAQ 折叠 */
    .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: border-color 0.2s ease;
    }

    .faq-item.active {
      border-color: var(--primary);
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 15px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
      color: var(--text-main);
    }

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

    .faq-toggle-icon {
      font-size: 18px;
      color: var(--primary);
      transition: transform 0.3s ease;
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #FAFAFC;
    }

    .faq-item.active .faq-answer {
      padding: 16px 24px;
      max-height: 250px;
      border-top: 1px solid var(--border-color);
      color: var(--text-sub);
      font-size: 14px;
      line-height: 1.6;
    }

    /* 资讯列表 */
    .article-links-box {
      background: #FFFFFF;
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--border-color);
    }

    .article-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
    }

    .article-list li a {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 14px;
      color: var(--text-sub);
      padding: 8px 12px;
      background: var(--bg-sub);
      border-radius: var(--radius-sm);
    }

    .article-list li a:hover {
      color: var(--primary);
      background: var(--primary-light);
    }

    /* 表单与联系区 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .contact-info-col h3 {
      font-size: 22px;
      font-weight: 800;
      margin-bottom: 16px;
      color: var(--text-main);
    }

    .contact-methods {
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .contact-item {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 14px;
      color: var(--text-sub);
    }

    .contact-item b {
      color: var(--text-main);
      width: 90px;
    }

    .qr-container {
      margin-top: 24px;
      display: inline-block;
      text-align: center;
      padding: 12px;
      border: 1px solid var(--border-warm);
      border-radius: var(--radius-md);
      background: var(--primary-light);
    }

    .qr-container img {
      width: 140px;
      height: 140px;
      border-radius: var(--radius-sm);
      margin-bottom: 6px;
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-group label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

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

    .form-control:focus {
      border-color: var(--primary);
    }

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

    /* 友情链接与页脚 */
    .site-footer {
      background: #181A1F;
      color: #A0A6B2;
      padding: 48px 0 24px;
      border-top: 1px solid #282C34;
    }

    .footer-inner {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .footer-links {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      padding-bottom: 20px;
      border-bottom: 1px solid #282C34;
      align-items: center;
    }

    .footer-links span {
      color: #FFFFFF;
      font-size: 13px;
      font-weight: 600;
    }

    .footer-links a {
      color: #A0A6B2;
      font-size: 13px;
    }

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

    .footer-bottom {
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      flex-wrap: wrap;
      gap: 12px;
    }

    .footer-bottom p {
      color: #798292;
    }

    /* 浮动工具栏 */
    .float-toolbar {
      position: fixed;
      right: 20px;
      bottom: 40px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .float-btn {
      width: 44px;
      height: 44px;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--text-main);
      cursor: pointer;
      font-size: 13px;
      font-weight: 700;
      transition: all 0.2s ease;
    }

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

    /* 响应式样式 */
    @media (max-width: 992px) {
      .grid-4, .flow-steps {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3, .media-gallery {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metric-card {
        border-bottom: 1px solid var(--border-color);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .article-list {
        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: stretch;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        display: none;
      }
      .nav-links.show {
        display: flex;
      }
      .nav-links li a {
        padding: 14px 20px;
        border-radius: 0;
        border-bottom: 1px solid #F0F0F0;
      }
      .hero-title {
        font-size: 26px;
      }
      .grid-3, .grid-4, .grid-2, .flow-steps, .media-gallery, .metrics-grid {
        grid-template-columns: 1fr;
      }
      .metric-card {
        border-right: none;
      }
      .review-score-panel {
        flex-direction: column;
        text-align: center;
      }
      .score-badge {
        flex-direction: column;
      }
    }