:root {
      --primary: #c92a2a;
      --primary-hover: #b02525;
      --primary-light: #fff5f5;
      --primary-border: #ffc9c9;
      --accent: #d9480f;
      --text-main: #212529;
      --text-sub: #495057;
      --text-muted: #868e96;
      --bg-page: #fbfbfc;
      --bg-card: #ffffff;
      --bg-alt: #f8f9fa;
      --border-color: #f1f3f5;
      --border-card: #e9ecef;
      --shadow-sm: 0 2px 8px rgba(201, 42, 42, 0.04);
      --shadow-md: 0 8px 24px rgba(201, 42, 42, 0.08);
      --shadow-lg: 0 16px 36px rgba(201, 42, 42, 0.12);
      --radius: 12px;
      --max-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, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--bg-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }
    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    .container {
      width: 100%;
      max-width: var(--max-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }
    .section-wrap.alt-bg {
      background-color: var(--bg-alt);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .section-title-wrap {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 52px;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      color: var(--primary);
      background-color: var(--primary-light);
      border: 1px solid var(--primary-border);
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
      line-height: 1.35;
    }
    .section-desc {
      font-size: 16px;
      color: var(--text-sub);
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background-color: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-card);
      transition: all 0.3s ease;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .nav-left {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .logo-box {
      display: flex;
      align-items: center;
      max-height: 44px;
    }
    .ai-page-logo {
      height: 38px;
      width: auto;
      object-fit: contain;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      padding: 10px 14px;
      border-radius: 6px;
    }
    .nav-links li a:hover {
      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: 8px;
      cursor: pointer;
      transition: all 0.25s cubic-bezier(0.165, 0.84, 0.44, 1);
      border: 1px solid transparent;
      white-space: nowrap;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(201, 42, 42, 0.25);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(201, 42, 42, 0.35);
      color: #ffffff;
    }
    .btn-outline {
      background-color: transparent;
      border-color: var(--primary-border);
      color: var(--primary);
    }
    .btn-outline:hover {
      background-color: var(--primary-light);
      border-color: var(--primary);
      transform: translateY(-2px);
    }
    .btn-lg {
      padding: 14px 32px;
      font-size: 16px;
      border-radius: 10px;
    }
    .mobile-menu-btn {
      display: none;
      flex-direction: column;
      justify-content: space-between;
      width: 26px;
      height: 20px;
      background: none;
      border: none;
      cursor: pointer;
      padding: 0;
    }
    .mobile-menu-btn span {
      display: block;
      width: 100%;
      height: 2px;
      background-color: var(--text-main);
      border-radius: 2px;
      transition: 0.3s;
    }

    /* 首屏 Hero 无图高雅科技感 */
    .hero-section {
      padding: 100px 0 80px;
      background: radial-gradient(circle at 50% 0%, #ffe3e3 0%, #fff5f5 40%, var(--bg-page) 80%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }
    .hero-badge-pill {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #ffffff;
      border: 1px solid var(--primary-border);
      padding: 6px 18px;
      border-radius: 30px;
      font-size: 14px;
      color: var(--primary);
      font-weight: 600;
      margin-bottom: 24px;
      box-shadow: var(--shadow-sm);
    }
    .hero-badge-dot {
      width: 8px;
      height: 8px;
      background-color: var(--primary);
      border-radius: 50%;
      animation: pulse 1.8s infinite;
    }
    @keyframes pulse {
      0% { transform: scale(0.9); opacity: 0.6; }
      50% { transform: scale(1.3); opacity: 1; box-shadow: 0 0 10px rgba(201,42,42,0.6); }
      100% { transform: scale(0.9); opacity: 0.6; }
    }
    .hero-content {
      max-width: 900px;
      margin: 0 auto;
      text-align: center;
    }
    .hero-title {
      font-size: 46px;
      font-weight: 800;
      line-height: 1.25;
      color: var(--text-main);
      margin-bottom: 22px;
      letter-spacing: -0.5px;
    }
    .hero-title span {
      color: var(--primary);
      position: relative;
    }
    .hero-lead {
      font-size: 18px;
      color: var(--text-sub);
      line-height: 1.7;
      margin-bottom: 36px;
    }
    .hero-buttons {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      margin-bottom: 48px;
    }
    .hero-stat-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
    }
    .hero-stat-card {
      background-color: rgba(255, 255, 255, 0.9);
      border: 1px solid var(--border-card);
      border-radius: var(--radius);
      padding: 20px;
      text-align: center;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease;
    }
    .hero-stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-border);
    }
    .hero-stat-number {
      font-size: 26px;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .hero-stat-desc {
      font-size: 13px;
      color: var(--text-sub);
    }

    /* 模型矩阵与标签 */
    .models-marquee-wrap {
      background-color: #ffffff;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
      padding: 24px 0;
    }
    .models-title {
      font-size: 13px;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--text-muted);
      text-align: center;
      margin-bottom: 16px;
      font-weight: 600;
    }
    .models-chip-grid {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      max-width: 1100px;
      margin: 0 auto;
    }
    .model-chip {
      background-color: var(--bg-alt);
      border: 1px solid var(--border-color);
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 13px;
      color: var(--text-sub);
      font-weight: 500;
      transition: all 0.2s ease;
    }
    .model-chip:hover {
      background-color: var(--primary-light);
      border-color: var(--primary-border);
      color: var(--primary);
    }

    /* 平台核心能力网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background-color: var(--bg-card);
      border: 1px solid var(--border-card);
      border-radius: var(--radius);
      padding: 28px;
      transition: all 0.3s ease;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-border);
    }
    .service-icon-box {
      width: 48px;
      height: 48px;
      background-color: var(--primary-light);
      border: 1px solid var(--primary-border);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-weight: 700;
      font-size: 18px;
      margin-bottom: 20px;
    }
    .service-card-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .service-card-desc {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.65;
      flex-grow: 1;
    }

    /* 制作场景图文展示 */
    .media-card-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
      margin-top: 36px;
    }
    .media-box-item {
      background: var(--bg-card);
      border: 1px solid var(--border-card);
      border-radius: var(--radius);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .media-box-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary-border);
    }
    .media-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 9;
      background-color: #eee;
      overflow: hidden;
    }
    .media-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .media-box-item:hover .media-img-wrap img {
      transform: scale(1.03);
    }
    .media-info-body {
      padding: 24px;
    }
    .media-info-tag {
      font-size: 12px;
      font-weight: 600;
      color: var(--primary);
      text-transform: uppercase;
      margin-bottom: 6px;
    }
    .media-info-title {
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .media-info-desc {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.6;
    }

    /* 流程步骤 */
    .flow-steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .step-card {
      background-color: var(--bg-card);
      border: 1px solid var(--border-card);
      border-radius: var(--radius);
      padding: 26px 20px;
      text-align: center;
      position: relative;
      box-shadow: var(--shadow-sm);
    }
    .step-number {
      width: 36px;
      height: 36px;
      line-height: 36px;
      border-radius: 50%;
      background-color: var(--primary);
      color: #ffffff;
      font-weight: 700;
      font-size: 16px;
      margin: 0 auto 16px;
    }
    .step-title {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 8px;
      color: var(--text-main);
    }
    .step-desc {
      font-size: 13px;
      color: var(--text-sub);
      line-height: 1.5;
    }

    /* 对比评测表格 */
    .review-score-banner {
      background: linear-gradient(135deg, #fff5f5 0%, #ffffff 100%);
      border: 1px solid var(--primary-border);
      border-radius: var(--radius);
      padding: 28px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 32px;
      box-shadow: var(--shadow-sm);
    }
    .score-stars-box {
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .score-stars {
      color: #f59f00;
      font-size: 24px;
      letter-spacing: 2px;
    }
    .score-num {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary);
    }
    .score-desc-txt {
      font-size: 14px;
      color: var(--text-sub);
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      background: var(--bg-card);
      border-radius: var(--radius);
      border: 1px solid var(--border-card);
      box-shadow: var(--shadow-sm);
    }
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 14px;
    }
    .comparison-table th,
    .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
    }
    .comparison-table th {
      background-color: var(--bg-alt);
      font-weight: 700;
      color: var(--text-main);
    }
    .comparison-table tr:last-child td {
      border-bottom: none;
    }
    .comparison-table .highlight-col {
      background-color: rgba(255, 245, 245, 0.4);
      font-weight: 600;
      color: var(--primary);
    }
    .status-ok {
      color: #2b8a3e;
      font-weight: 600;
    }
    .status-no {
      color: #868e96;
    }

    /* 客户真实评价 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: var(--bg-card);
      border: 1px solid var(--border-card);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-content {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
      margin-bottom: 20px;
      position: relative;
      font-style: italic;
    }
    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 14px;
    }
    .user-avatar-initial {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 15px;
      border: 1px solid var(--primary-border);
    }
    .user-name {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }
    .user-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 需求匹配与表单 */
    .form-wrapper {
      max-width: 680px;
      margin: 0 auto;
      background: var(--bg-card);
      border: 1px solid var(--border-card);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-md);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      font-size: 14px;
      border: 1px solid var(--border-card);
      border-radius: 8px;
      background-color: #fff;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s;
    }
    .form-control:focus {
      border-color: var(--primary);
    }
    textarea.form-control {
      min-height: 110px;
      resize: vertical;
    }

    /* FAQ 手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }
    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-card);
      border-radius: 8px;
      margin-bottom: 14px;
      overflow: hidden;
      transition: all 0.2s ease;
    }
    .faq-item.active {
      border-color: var(--primary-border);
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      padding: 18px 22px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      font-size: 15px;
      color: var(--text-main);
      user-select: none;
    }
    .faq-toggle-icon {
      font-size: 18px;
      font-weight: 400;
      color: var(--primary);
      transition: transform 0.25s ease;
    }
    .faq-item.active .faq-toggle-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease;
      background: #fafafa;
    }
    .faq-answer-inner {
      padding: 0 22px 18px;
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.65;
    }

    /* 行业资讯与动态 */
    .article-links-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      margin-top: 24px;
    }
    .article-link-item {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: var(--bg-card);
      border: 1px solid var(--border-card);
      padding: 16px 20px;
      border-radius: 8px;
      font-size: 14px;
      font-weight: 500;
      color: var(--text-main);
      transition: all 0.2s ease;
    }
    .article-link-item:hover {
      border-color: var(--primary-border);
      color: var(--primary);
      transform: translateX(4px);
    }

    /* 底部专属布局 */
    .site-footer {
      background-color: #ffffff;
      border-top: 1px solid var(--border-card);
      padding: 60px 0 28px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-about-p {
      font-size: 14px;
      color: var(--text-sub);
      line-height: 1.7;
      margin-top: 14px;
    }
    .footer-heading {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
      position: relative;
    }
    .footer-list {
      list-style: none;
    }
    .footer-list li {
      margin-bottom: 10px;
    }
    .footer-list li a {
      font-size: 13px;
      color: var(--text-sub);
    }
    .footer-list li a:hover {
      color: var(--primary);
    }
    .footer-contact-info p {
      font-size: 13px;
      color: var(--text-sub);
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .qr-container {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-top: 14px;
    }
    .qr-img-box {
      width: 76px;
      height: 76px;
      border: 1px solid var(--border-card);
      border-radius: 6px;
      padding: 4px;
      background: #fff;
    }
    .qr-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .qr-desc {
      font-size: 12px;
      color: var(--text-muted);
      line-height: 1.4;
    }
    .friend-links-box {
      border-top: 1px solid var(--border-color);
      padding-top: 20px;
      margin-top: 20px;
      font-size: 13px;
      color: var(--text-muted);
    }
    .friend-links-box a {
      color: var(--text-sub);
      margin-right: 14px;
      display: inline-block;
      margin-bottom: 6px;
    }
    .friend-links-box a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      border-top: 1px solid var(--border-color);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 悬浮客服面板 */
    .float-widget {
      position: fixed;
      right: 20px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .float-btn {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #ffffff;
      border: 1px solid var(--border-card);
      box-shadow: var(--shadow-md);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      color: var(--primary);
      transition: all 0.25s ease;
      position: relative;
    }
    .float-btn:hover {
      background: var(--primary);
      color: #ffffff;
    }
    .float-qr-pop {
      position: absolute;
      right: 56px;
      bottom: 0;
      background: #ffffff;
      padding: 12px;
      border-radius: 8px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-card);
      display: none;
      width: 140px;
      text-align: center;
    }
    .float-btn:hover .float-qr-pop {
      display: block;
    }
    .float-qr-pop img {
      width: 116px;
      height: 116px;
      margin: 0 auto 6px;
    }
    .float-qr-pop span {
      font-size: 11px;
      color: var(--text-sub);
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .services-grid,
      .testimonials-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .flow-steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .hero-stat-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }
    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: flex;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px 24px;
        border-bottom: 1px solid var(--border-card);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 12px 0;
        border-bottom: 1px solid var(--border-color);
      }
      .nav-actions {
        display: none;
      }
      .hero-title {
        font-size: 30px;
      }
      .hero-lead {
        font-size: 15px;
      }
      .services-grid,
      .media-card-grid,
      .testimonials-grid,
      .flow-steps-grid,
      .hero-stat-grid,
      .article-links-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .review-score-banner {
        flex-direction: column;
        text-align: center;
        gap: 16px;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
    }