:root {
      --primary-color: #ff5500;
      --primary-hover: #e04b00;
      --primary-light: #fff3eb;
      --primary-gradient: linear-gradient(135deg, #ff6b00 0%, #ff3b00 100%);
      --accent-color: #ff8800;
      --text-main: #1f2329;
      --text-regular: #4e5969;
      --text-muted: #86909c;
      --bg-page: #f7f8fa;
      --bg-card: #ffffff;
      --border-color: #e5e6eb;
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 8px 24px rgba(255, 85, 0, 0.08);
      --shadow-lg: 0 16px 32px rgba(255, 85, 0, 0.12);
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --container-width: 1200px;
    }

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

    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: 0 auto;
      padding: 0 20px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.96);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

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

    .nav-brand {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 1.25rem;
      color: var(--primary-color);
    }

    .ai-page-logo {
      height: 38px;
      width: auto;
    }

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

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

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary-color);
      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 24px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-sm);
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      text-align: center;
    }

    .btn-primary {
      background: var(--primary-gradient);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(255, 85, 0, 0.3);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #ff7a1a 0%, #e63400 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(255, 85, 0, 0.4);
      color: #ffffff;
    }

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

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

    .btn-sm {
      padding: 6px 14px;
      font-size: 0.85rem;
    }

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

    /* 首屏 Hero (无图片) */
    .hero-section {
      background: radial-gradient(circle at 80% 20%, #ffece0 0%, #ffffff 60%, #fff7f2 100%);
      padding: 80px 0 60px;
      position: relative;
      border-bottom: 1px solid rgba(255, 85, 0, 0.1);
    }

    .hero-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 16px;
      background: var(--primary-light);
      border: 1px solid rgba(255, 85, 0, 0.2);
      color: var(--primary-color);
      border-radius: 30px;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

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

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-regular);
      margin-bottom: 36px;
      line-height: 1.7;
    }

    .hero-btns {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 48px;
    }

    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }

    .stat-item {
      text-align: center;
      border-right: 1px solid var(--border-color);
    }

    .stat-item:last-child {
      border-right: none;
    }

    .stat-value {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary-color);
      margin-bottom: 4px;
    }

    .stat-label {
      font-size: 0.88rem;
      color: var(--text-muted);
    }

    /* 区域通用样式 */
    .section-padding {
      padding: 72px 0;
    }

    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 50px;
    }

    .section-tag {
      color: var(--primary-color);
      font-weight: 700;
      font-size: 0.88rem;
      letter-spacing: 1px;
      text-transform: uppercase;
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-subtitle {
      font-size: 1rem;
      color: var(--text-regular);
    }

    .card {
      background: var(--bg-card);
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      padding: 28px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
    }

    .card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(255, 85, 0, 0.3);
    }

    /* 平台介绍 */
    .platform-intro-box {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

    .platform-features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
      margin-top: 30px;
    }

    .pf-item {
      padding: 20px;
      background: var(--primary-light);
      border-radius: var(--radius-sm);
      border-left: 4px solid var(--primary-color);
    }

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

    .pf-item p {
      font-size: 0.9rem;
      color: var(--text-regular);
    }

    /* 模型支持网格 */
    .model-badge-container {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-badge {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 500;
      color: var(--text-regular);
      transition: all 0.2s;
    }

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

    /* 服务与能力 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .service-card h3 {
      font-size: 1.2rem;
      margin-bottom: 12px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .service-card h3::before {
      content: "";
      width: 8px;
      height: 8px;
      background: var(--primary-color);
      border-radius: 50%;
      display: inline-block;
    }

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

    /* 标准流程时间线 */
    .timeline-steps {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      position: relative;
    }

    .step-card {
      background: #ffffff;
      padding: 24px;
      border-radius: var(--radius-md);
      border-top: 4px solid var(--primary-color);
      box-shadow: var(--shadow-sm);
    }

    .step-number {
      font-size: 1.8rem;
      font-weight: 800;
      color: var(--primary-color);
      opacity: 0.3;
      margin-bottom: 8px;
    }

    .step-card h4 {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }

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

    /* 对比评测 */
    .review-highlight-card {
      background: #ffffff;
      border: 2px solid var(--primary-color);
      border-radius: var(--radius-md);
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: var(--shadow-md);
    }

    .review-score-box {
      display: flex;
      align-items: baseline;
      gap: 8px;
    }

    .review-big-score {
      font-size: 3rem;
      font-weight: 900;
      color: var(--primary-color);
    }

    .review-stars {
      color: #ff9900;
      font-size: 1.25rem;
      letter-spacing: 2px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }

    .eval-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

    .eval-table th, .eval-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }

    .eval-table th {
      background: #fafafa;
      color: var(--text-main);
      font-weight: 600;
    }

    .eval-table tr:hover {
      background: var(--primary-light);
    }

    .eval-table .highlight {
      color: var(--primary-color);
      font-weight: 700;
    }

    /* 案例与素材图 */
    .showcase-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .showcase-item {
      background: #ffffff;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .showcase-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      overflow: hidden;
      background: #eee;
    }

    .showcase-img-wrap.square {
      aspect-ratio: 1 / 1;
    }

    .showcase-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .showcase-item:hover .showcase-img-wrap img {
      transform: scale(1.05);
    }

    .showcase-body {
      padding: 20px;
      flex-grow: 1;
    }

    .showcase-body h4 {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }

    .showcase-body p {
      font-size: 0.88rem;
      color: var(--text-regular);
    }

    /* 客户评价 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

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

    .testimonial-text {
      font-size: 0.92rem;
      color: var(--text-regular);
      font-style: italic;
      margin-bottom: 20px;
      line-height: 1.7;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f0f0f0;
      padding-top: 14px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      background: var(--primary-light);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary-color);
      font-weight: bold;
    }

    .user-meta h5 {
      font-size: 0.95rem;
      color: var(--text-main);
    }

    .user-meta span {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      display: flex;
      flex-direction: column;
      gap: 14px;
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.3s ease;
    }

    .faq-question {
      padding: 18px 24px;
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }

    .faq-question::after {
      content: "+";
      font-size: 1.3rem;
      color: var(--primary-color);
      transition: transform 0.3s ease;
    }

    .faq-item.active .faq-question::after {
      content: "-";
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1);
      background: #fafafa;
    }

    .faq-answer-inner {
      padding: 16px 24px;
      font-size: 0.92rem;
      color: var(--text-regular);
      line-height: 1.7;
      border-top: 1px solid var(--border-color);
    }

    .faq-item.active .faq-answer {
      max-height: 500px;
      transition: max-height 0.3s cubic-bezier(1, 0, 1, 0);
    }

    /* 需求表单与联系 */
    .form-contact-wrap {
      display: grid;
      grid-template-columns: 3fr 2fr;
      gap: 32px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

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

    .form-group label {
      display: block;
      font-size: 0.9rem;
      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: 0.95rem;
      outline: none;
      transition: border-color 0.2s ease;
    }

    .form-control:focus {
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(255, 85, 0, 0.1);
    }

    .contact-info-panel {
      background: var(--primary-light);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .contact-qr {
      text-align: center;
      margin: 16px 0;
    }

    .contact-qr img {
      width: 140px;
      height: 140px;
      margin: 0 auto 8px;
      border-radius: var(--radius-sm);
      border: 1px solid rgba(255, 85, 0, 0.2);
    }

    /* 资讯列表 */
    .article-list {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 16px;
      margin-top: 24px;
    }

    .article-item a {
      display: block;
      padding: 14px 18px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      font-size: 0.9rem;
      color: var(--text-regular);
      font-weight: 500;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
    }

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

    /* 友情链接 */
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      padding-top: 16px;
    }

    .friend-links-box a {
      font-size: 0.88rem;
      color: var(--text-muted);
      padding: 4px 10px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 4px;
    }

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

    /* 页脚 */
    .site-footer {
      background: #111417;
      color: #a0a6b1;
      padding: 60px 0 24px;
      margin-top: 60px;
      border-top: 3px solid var(--primary-color);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

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

    .footer-col ul {
      list-style: none;
    }

    .footer-col ul li {
      margin-bottom: 10px;
      font-size: 0.9rem;
    }

    .footer-col ul li a:hover {
      color: #ffffff;
    }

    .footer-bottom {
      border-top: 1px solid #23272e;
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.85rem;
    }

    /* 浮动客服 */
    .float-service-bar {
      position: fixed;
      right: 20px;
      bottom: 80px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-item {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border-radius: 50%;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      border: 1px solid var(--border-color);
      color: var(--primary-color);
      font-size: 1.1rem;
      position: relative;
    }

    .float-item:hover {
      background: var(--primary-color);
      color: #ffffff;
    }

    .float-qr-pop {
      position: absolute;
      right: 60px;
      top: -30px;
      background: #ffffff;
      padding: 12px;
      border-radius: var(--radius-sm);
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      display: none;
      width: 160px;
      text-align: center;
    }

    .float-item:hover .float-qr-pop {
      display: block;
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.1rem;
      }
      .hero-stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
      }
      .stat-item:nth-child(2) {
        border-right: none;
      }
      .platform-features-grid,
      .timeline-steps,
      .showcase-grid,
      .testimonial-grid,
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .form-contact-wrap {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-actions {
        display: none;
      }
      .hero-title {
        font-size: 1.8rem;
      }
      .hero-stats-grid,
      .platform-features-grid,
      .timeline-steps,
      .showcase-grid,
      .testimonial-grid,
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .review-highlight-card {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }