:root {
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --brand-primary: #0284c7;
      --brand-accent: #06b6d4;
      --brand-neon: #10b981;
      --brand-gradient: linear-gradient(135deg, #0284c7 0%, #06b6d4 50%, #10b981 100%);
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
      --shadow-md: 0 4px 14px rgba(2, 132, 199, 0.08);
      --shadow-lg: 0 10px 30px rgba(2, 132, 199, 0.12);
      --radius: 12px;
    }

    * {
      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, sans-serif;
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      background-image: radial-gradient(at 0% 0%, rgba(6, 182, 212, 0.04) 0px, transparent 50%),
                        radial-gradient(at 100% 100%, rgba(16, 185, 129, 0.04) 0px, transparent 50%);
      background-attachment: fixed;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 20px;
      width: 100%;
    }

    /* 顶部导航 */
    header.site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
    }

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

    .logo-area {
      display: flex;
      align-items: center;
      gap: 12px;
      text-decoration: none;
      color: var(--text-main);
      font-weight: 700;
      font-size: 1.25rem;
    }

    .logo-area img.ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }

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

    .nav-links a {
      text-decoration: none;
      color: var(--text-muted);
      font-weight: 500;
      font-size: 0.95rem;
      padding: 8px 12px;
      transition: color 0.2s, background 0.2s;
      border-radius: 6px;
    }

    .nav-links a:hover {
      color: var(--brand-primary);
      background: rgba(2, 132, 199, 0.05);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      border-radius: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      text-decoration: none;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
    }

    .btn-primary {
      background: var(--brand-gradient);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(6, 182, 212, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(6, 182, 212, 0.45);
    }

    .btn-outline {
      background: transparent;
      border-color: var(--brand-accent);
      color: var(--brand-primary);
    }

    .btn-outline:hover {
      background: rgba(6, 182, 212, 0.08);
      transform: translateY(-2px);
    }

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

    /* 首屏 Hero */
    .hero-section {
      padding: 80px 0 60px;
      text-align: center;
      position: relative;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      border-radius: 30px;
      background: rgba(6, 182, 212, 0.1);
      border: 1px solid rgba(6, 182, 212, 0.3);
      color: #0369a1;
      font-size: 0.875rem;
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-badge::before {
      content: "";
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: var(--brand-neon);
      box-shadow: 0 0 8px var(--brand-neon);
    }

    .hero-title {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.02em;
      margin-bottom: 20px;
    }

    .hero-title span {
      background: var(--brand-gradient);
      -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;
    }

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

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }

    .stat-item h3 {
      font-size: 2rem;
      font-weight: 800;
      color: #0284c7;
      margin-bottom: 6px;
    }

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

    /* 区域通用结构 */
    .section-block {
      padding: 70px 0;
    }

    .section-header {
      text-align: center;
      margin-bottom: 48px;
    }

    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.1em;
      color: var(--brand-accent);
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      max-width: 680px;
      margin: 0 auto;
    }

    /* 服务能力卡片 */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 24px;
    }

    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      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: rgba(6, 182, 212, 0.4);
    }

    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: 10px;
      background: rgba(6, 182, 212, 0.1);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
      color: var(--brand-primary);
    }

    .service-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      margin-bottom: 10px;
      color: var(--text-main);
    }

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

    /* 平台矩阵标签云 */
    .models-section {
      background: #f1f5f9;
      border-radius: var(--radius);
      padding: 40px 30px;
      margin: 40px 0;
      border: 1px solid var(--border-color);
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      justify-content: center;
      margin-top: 24px;
    }

    .model-pill {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 8px 16px;
      border-radius: 20px;
      font-size: 0.85rem;
      font-weight: 600;
      color: #334155;
      box-shadow: 0 1px 2px rgba(0, 0, 0, 0.03);
      transition: all 0.2s ease;
    }

    .model-pill:hover {
      border-color: var(--brand-neon);
      color: #0284c7;
      transform: scale(1.05);
    }

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

    .step-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      position: relative;
    }

    .step-number {
      font-size: 2rem;
      font-weight: 900;
      color: rgba(2, 132, 199, 0.15);
      margin-bottom: 8px;
    }

    .step-box h3 {
      font-size: 1.1rem;
      margin-bottom: 8px;
      color: var(--text-main);
    }

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

    /* 评测与对比表格 */
    .rating-banner {
      background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
      color: #ffffff;
      border-radius: var(--radius);
      padding: 32px 40px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      flex-wrap: wrap;
      gap: 20px;
    }

    .rating-left h3 {
      font-size: 1.6rem;
      margin-bottom: 6px;
    }

    .rating-stars {
      color: #f59e0b;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }

    .rating-score {
      font-size: 3rem;
      font-weight: 900;
      color: #38bdf8;
      line-height: 1;
    }

    .rating-score span {
      font-size: 1.2rem;
      color: #94a3b8;
    }

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

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 600px;
    }

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.95rem;
    }

    .compare-table th {
      background: #f8fafc;
      color: var(--text-main);
      font-weight: 700;
    }

    .highlight-cell {
      background: rgba(6, 182, 212, 0.04);
      font-weight: 600;
      color: #0369a1;
    }

    /* 案例图片展示 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      overflow: hidden;
      display: flex;
      flex-direction: column;
    }

    .case-img-wrap {
      width: 100%;
      aspect-ratio: 16 / 10;
      background: #e2e8f0;
      overflow: hidden;
    }

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

    .case-img-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.3s ease;
    }

    .case-card:hover .case-img-wrap img {
      transform: scale(1.04);
    }

    .case-info {
      padding: 20px;
      flex: 1;
    }

    .case-info h3 {
      font-size: 1.1rem;
      margin-bottom: 8px;
    }

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

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }

    .review-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
    }

    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 14px;
    }

    .user-avatar-badge {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--brand-gradient);
      color: #fff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1rem;
    }

    .user-meta h4 {
      font-size: 0.95rem;
      color: var(--text-main);
    }

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

    .review-card blockquote {
      font-size: 0.9rem;
      color: #334155;
      line-height: 1.6;
    }

    /* 折叠面板 FAQ */
    .faq-wrapper {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
      transition: border-color 0.2s;
    }

    .faq-header {
      padding: 18px 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: var(--text-main);
      user-select: none;
    }

    .faq-header:hover {
      background: #f8fafc;
    }

    .faq-icon {
      font-size: 1.2rem;
      transition: transform 0.25s;
    }

    .faq-body {
      padding: 0 24px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.7;
    }

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

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

    .faq-item.active .faq-body {
      padding: 0 24px 20px;
      max-height: 300px;
    }

    /* 需求表单与联系 */
    .contact-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: start;
    }

    .form-box {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }

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

    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 6px;
      font-size: 0.95rem;
      color: var(--text-main);
      outline: none;
      background: #fff;
    }

    .form-control:focus {
      border-color: var(--brand-primary);
      box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.12);
    }

    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    .contact-info-panel {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

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

    .info-card h4 {
      font-size: 1.1rem;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .qr-container {
      display: flex;
      align-items: center;
      gap: 20px;
      margin-top: 10px;
    }

    .qr-container img {
      width: 110px;
      height: 110px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      object-fit: cover;
    }

    /* 行业资讯 / 最新文章 */
    .article-links-wrap {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      margin-top: 24px;
    }

    .article-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 12px;
    }

    .article-list a {
      color: #0369a1;
      text-decoration: none;
      font-size: 0.92rem;
      display: inline-block;
      padding: 4px 0;
    }

    .article-list a:hover {
      text-decoration: underline;
    }

    /* 宣传图画廊 */
    .gallery-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
      margin-top: 30px;
    }

    .gallery-item {
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
    }

    .gallery-item img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      display: block;
    }

    /* 友情链接 */
    .friend-links-area {
      padding: 30px 0;
      border-top: 1px solid var(--border-color);
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      font-size: 0.9rem;
      color: var(--text-muted);
    }

    .friend-links-area a {
      color: var(--text-muted);
      text-decoration: none;
      transition: color 0.2s;
    }

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

    /* 页脚 */
    footer.site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 40px 0 20px;
      border-top: 1px solid #1e293b;
    }

    .footer-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 1px solid #1e293b;
    }

    .footer-brand {
      color: #ffffff;
      font-size: 1.2rem;
      font-weight: 700;
    }

    .footer-links {
      display: flex;
      gap: 20px;
    }

    .footer-links a {
      color: #cbd5e1;
      text-decoration: none;
      font-size: 0.9rem;
    }

    .footer-links a:hover {
      color: #38bdf8;
    }

    .footer-bottom {
      padding-top: 20px;
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
    }

    /* 浮动客服 */
    .floating-support {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #ffffff;
      box-shadow: 0 4px 14px rgba(0, 0, 0, 0.15);
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      text-decoration: none;
      color: var(--brand-primary);
      font-size: 1.2rem;
      border: 1px solid var(--border-color);
      transition: transform 0.2s ease;
    }

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

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-container {
        grid-template-columns: 1fr;
      }
      .case-grid {
        grid-template-columns: 1fr;
      }
      .gallery-row {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        padding: 10px 0;
        width: 100%;
      }
      .hero-title {
        font-size: 2rem;
      }
      .hero-stats {
        grid-template-columns: 1fr;
      }
      .steps-grid {
        grid-template-columns: 1fr;
      }
    }