:root {
      --primary-red: #c9182b;
      --primary-hover: #a31221;
      --accent-gold: #f59e0b;
      --warm-bg: #fff8f8;
      --card-bg: #ffffff;
      --text-main: #1f242d;
      --text-muted: #5c6470;
      --border-color: #fce7e7;
      --shadow-sm: 0 4px 12px rgba(201, 24, 43, 0.05);
      --shadow-md: 0 10px 24px rgba(201, 24, 43, 0.08);
      --shadow-lg: 0 16px 36px rgba(201, 24, 43, 0.12);
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    }

    * {
      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, "Noto Sans", sans-serif;
      background-color: var(--warm-bg);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
    }

    .container {
      width: 100%;
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部导航 */
    header.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: 0 2px 10px rgba(0, 0, 0, 0.03);
    }

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

    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
    }

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

    .brand-text {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary-red);
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      color: var(--text-main);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 12px;
      border-radius: 6px;
      transition: var(--transition);
    }

    .nav-links li a:hover {
      color: var(--primary-red);
      background: #fff1f2;
    }

    .nav-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: 8px;
      text-decoration: none;
      cursor: pointer;
      transition: var(--transition);
      border: none;
    }

    .btn-primary {
      background: linear-gradient(135deg, #c9182b 0%, #e63946 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(201, 24, 43, 0.25);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, #a31221 0%, #c9182b 100%);
      box-shadow: 0 6px 18px rgba(201, 24, 43, 0.35);
      transform: translateY(-2px);
    }

    .btn-outline {
      background: #ffffff;
      color: var(--primary-red);
      border: 1px solid var(--primary-red);
    }

    .btn-outline:hover {
      background: #fff1f2;
      transform: translateY(-2px);
    }

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

    /* 区域通用规范 */
    section {
      padding: 72px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 48px;
    }

    .section-tag {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary-red);
      background: #ffe8ea;
      border-radius: 50px;
      margin-bottom: 12px;
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: #1a1e26;
      line-height: 1.3;
      margin-bottom: 14px;
    }

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

    /* 首屏 Hero */
    .hero-section {
      padding: 80px 0 60px;
      background: radial-gradient(circle at 50% 20%, #ffecee 0%, #ffffff 80%);
      text-align: center;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      border-radius: 30px;
      font-size: 0.9rem;
      color: var(--primary-red);
      font-weight: 600;
      margin-bottom: 24px;
      animation: pulseGlow 2.5s infinite;
    }

    .hero-title {
      font-size: 2.75rem;
      font-weight: 900;
      color: #11141a;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title span {
      color: var(--primary-red);
      background: linear-gradient(120deg, #c9182b, #ff4757);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      justify-content: center;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }

    .btn-hero-official {
      padding: 14px 36px;
      font-size: 1.1rem;
      font-weight: 700;
      background: linear-gradient(135deg, #c9182b 0%, #e63946 100%);
      color: #ffffff;
      border-radius: 10px;
      box-shadow: 0 8px 24px rgba(201, 24, 43, 0.3);
      text-decoration: none;
      transition: var(--transition);
    }

    .btn-hero-official:hover {
      transform: translateY(-3px);
      box-shadow: 0 12px 30px rgba(201, 24, 43, 0.4);
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      max-width: 980px;
      margin: 0 auto;
    }

    .metric-card {
      background: #ffffff;
      padding: 24px 16px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .metric-num {
      font-size: 2rem;
      font-weight: 800;
      color: var(--primary-red);
      line-height: 1.2;
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 0.88rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台核心模型支持栏 */
    .model-ticker-section {
      padding: 30px 0;
      background: #ffffff;
      border-top: 1px solid #f3e6e6;
      border-bottom: 1px solid #f3e6e6;
    }

    .ticker-title {
      text-align: center;
      font-size: 0.9rem;
      font-weight: 700;
      color: #8c93a0;
      text-transform: uppercase;
      letter-spacing: 1px;
      margin-bottom: 16px;
    }

    .ticker-tags {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .ticker-item {
      padding: 6px 14px;
      font-size: 0.82rem;
      background: #fdf2f2;
      color: #a31221;
      border-radius: 6px;
      font-weight: 600;
      border: 1px solid #fae1e1;
    }

    /* 业务服务卡片网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: #ffffff;
      border-radius: 14px;
      padding: 30px 24px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .service-card:hover {
      transform: translateY(-5px);
      border-color: #f7a8b0;
      box-shadow: var(--shadow-md);
    }

    .service-icon-box {
      width: 48px;
      height: 48px;
      background: #ffe8ea;
      color: var(--primary-red);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      font-weight: 800;
      margin-bottom: 18px;
    }

    .service-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: #171b22;
    }

    .service-card p {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
      flex-grow: 1;
    }

    .service-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 6px;
    }

    .service-tag-item {
      font-size: 0.78rem;
      padding: 3px 8px;
      background: #f9f9fa;
      color: #64748b;
      border-radius: 4px;
      border: 1px solid #eee;
    }

    /* 制作场景全景展示 */
    .scenes-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 18px;
    }

    .scene-item {
      background: #ffffff;
      border: 1px solid #f2e2e2;
      border-radius: 10px;
      padding: 20px 16px;
      transition: var(--transition);
    }

    .scene-item:hover {
      border-color: var(--primary-red);
      box-shadow: var(--shadow-sm);
      background: #fffcfc;
    }

    .scene-item h4 {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--primary-red);
      margin-bottom: 8px;
    }

    .scene-item p {
      font-size: 0.85rem;
      color: #4b5563;
      line-height: 1.5;
    }

    /* 宣传图展示区 */
    .banner-display-wrap {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 40px;
    }

    .media-card {
      background: #ffffff;
      border-radius: 12px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .media-card img {
      width: 100%;
      height: 240px;
      object-fit: cover;
      display: block;
    }

    .media-content {
      padding: 18px 20px;
    }

    .media-content h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: #171b22;
    }

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

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

    .workflow-step {
      background: #ffffff;
      padding: 28px 20px;
      border-radius: 12px;
      border: 1px solid var(--border-color);
      position: relative;
      transition: var(--transition);
    }

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

    .step-index {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 36px;
      height: 36px;
      background: var(--primary-red);
      color: #ffffff;
      font-weight: 800;
      border-radius: 8px;
      margin-bottom: 14px;
    }

    .workflow-step h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }

    .workflow-step p {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 对比评测表格与卡片 */
    .eval-highlight-box {
      background: linear-gradient(135deg, #c9182b 0%, #900d1c 100%);
      border-radius: 16px;
      padding: 36px 40px;
      color: #ffffff;
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 36px;
      box-shadow: var(--shadow-lg);
    }

    .eval-score-num {
      font-size: 3.5rem;
      font-weight: 900;
      line-height: 1;
      color: #ffffff;
    }

    .eval-score-stars {
      color: #ffd166;
      font-size: 1.4rem;
      margin-top: 6px;
    }

    .table-container {
      width: 100%;
      overflow-x: auto;
      background: #ffffff;
      border-radius: 14px;
      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 #f5e4e4;
      font-size: 0.92rem;
    }

    .compare-table th {
      background: #fff5f5;
      font-weight: 700;
      color: #1a1e26;
    }

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

    .highlight-col {
      background: #fffafa;
      font-weight: 600;
      color: var(--primary-red);
    }

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 14px;
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: var(--transition);
    }

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

    .review-stars {
      color: #f59e0b;
      margin-bottom: 12px;
      font-size: 0.9rem;
    }

    .review-body {
      font-size: 0.92rem;
      color: #4b5563;
      line-height: 1.6;
      margin-bottom: 18px;
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f8e9e9;
      padding-top: 14px;
    }

    .user-avatar {
      width: 42px;
      height: 42px;
      border-radius: 50%;
      background: #ffe8ea;
      color: var(--primary-red);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.95rem;
    }

    .user-meta h5 {
      font-size: 0.95rem;
      color: #171b22;
      font-weight: 700;
    }

    .user-meta span {
      font-size: 0.8rem;
      color: #6b7280;
    }

    /* FAQ 折叠面板 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 10px;
      overflow: hidden;
      transition: var(--transition);
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 700;
      font-size: 1rem;
      color: #1a1e26;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      user-select: none;
      background: #ffffff;
    }

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

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.3s ease;
      color: var(--primary-red);
    }

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

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.35s ease, padding 0.35s ease;
      background: #fffcfc;
      padding: 0 24px;
      font-size: 0.92rem;
      color: #555e6d;
      line-height: 1.6;
    }

    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 0 24px 20px 24px;
    }

    /* 表单与联系 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 40px;
      box-shadow: var(--shadow-sm);
    }

    .contact-info h3 {
      font-size: 1.5rem;
      font-weight: 800;
      margin-bottom: 14px;
      color: #11141a;
    }

    .contact-info p {
      font-size: 0.95rem;
      color: var(--text-muted);
      margin-bottom: 24px;
      line-height: 1.6;
    }

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

    .detail-row {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 0.92rem;
    }

    .detail-label {
      font-weight: 700;
      color: #1f242d;
      width: 90px;
    }

    .qr-box {
      padding: 16px;
      background: #fff5f5;
      border-radius: 10px;
      display: inline-block;
      text-align: center;
      max-width: 170px;
    }

    .qr-box img {
      width: 130px;
      height: 130px;
      display: block;
      border-radius: 6px;
      margin-bottom: 8px;
    }

    .qr-box span {
      font-size: 0.8rem;
      color: #6b7280;
      font-weight: 600;
    }

    .custom-form {
      display: flex;
      flex-direction: column;
      gap: 18px;
    }

    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }

    .form-group label {
      font-size: 0.88rem;
      font-weight: 600;
      color: #2b303a;
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 1px solid #e2e8f0;
      border-radius: 8px;
      font-size: 0.92rem;
      transition: var(--transition);
      outline: none;
      background: #fcfcfd;
    }

    .form-control:focus {
      border-color: var(--primary-red);
      background: #ffffff;
      box-shadow: 0 0 0 3px rgba(201, 24, 43, 0.1);
    }

    /* 资讯与友情链接 */
    .news-links-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 24px;
      margin-top: 36px;
    }

    .info-list-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 12px;
      padding: 24px;
    }

    .info-list-card h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 16px;
      color: #171b22;
      border-bottom: 1px solid #fae8e8;
      padding-bottom: 10px;
    }

    .article-links, .friend-links {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      list-style: none;
    }

    .article-links a, .friend-links a {
      color: var(--text-muted);
      text-decoration: none;
      font-size: 0.88rem;
      padding: 6px 12px;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 6px;
      transition: var(--transition);
    }

    .article-links a:hover, .friend-links a:hover {
      color: var(--primary-red);
      background: #fff1f2;
      border-color: #fca5a5;
    }

    /* 页脚 */
    footer.site-footer {
      background: #191c21;
      color: #d1d5db;
      padding: 48px 0 24px;
      font-size: 0.88rem;
    }

    .footer-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 30px;
      border-bottom: 1px solid #2d333b;
    }

    .footer-brand h4 {
      color: #ffffff;
      font-size: 1.25rem;
      margin-bottom: 8px;
    }

    .footer-brand p {
      color: #9ca3af;
    }

    .footer-links-row {
      display: flex;
      gap: 18px;
      flex-wrap: wrap;
    }

    .footer-links-row a {
      color: #9ca3af;
      text-decoration: none;
      transition: var(--transition);
    }

    .footer-links-row a:hover {
      color: #ffffff;
    }

    .footer-bottom {
      text-align: center;
      padding-top: 24px;
      color: #6b7280;
    }

    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: var(--primary-red);
      color: #ffffff;
      width: 52px;
      height: 52px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 8px 20px rgba(201, 24, 43, 0.4);
      cursor: pointer;
      text-decoration: none;
      font-size: 1.3rem;
      transition: var(--transition);
    }

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

    @keyframes pulseGlow {
      0%, 100% { box-shadow: 0 0 0 0 rgba(201, 24, 43, 0.2); }
      50% { box-shadow: 0 0 0 8px rgba(201, 24, 43, 0); }
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .hero-metrics { grid-template-columns: repeat(2, 1fr); }
      .services-grid { grid-template-columns: repeat(2, 1fr); }
      .scenes-grid { grid-template-columns: repeat(2, 1fr); }
      .workflow-timeline { grid-template-columns: repeat(2, 1fr); }
      .reviews-grid { grid-template-columns: repeat(2, 1fr); }
      .contact-wrapper { grid-template-columns: 1fr; }
      .banner-display-wrap { grid-template-columns: 1fr; }
      .eval-highlight-box { flex-direction: column; text-align: center; gap: 20px; }
      .nav-links { display: none; }
      .mobile-menu-btn { display: block; }
    }

    @media (max-width: 640px) {
      .hero-title { font-size: 2rem; }
      .section-title { font-size: 1.6rem; }
      .services-grid { grid-template-columns: 1fr; }
      .scenes-grid { grid-template-columns: 1fr; }
      .workflow-timeline { grid-template-columns: 1fr; }
      .reviews-grid { grid-template-columns: 1fr; }
      .hero-metrics { grid-template-columns: 1fr; }
      .news-links-grid { grid-template-columns: 1fr; }
      .contact-wrapper { padding: 24px; }
    }