:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --secondary: #06b6d4;
      --accent-pink: #ec4899;
      --accent-amber: #f59e0b;
      --accent-emerald: #10b981;
      --accent-purple: #8b5cf6;
      --bg-main: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #1e293b;
      --text-muted: #64748b;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
      --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
      --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);
      --container-max: 1200px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    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(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: 
        radial-gradient(at 0% 0%, rgba(99, 102, 241, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(236, 72, 153, 0.05) 0px, transparent 50%),
        radial-gradient(at 50% 50%, rgba(6, 182, 212, 0.04) 0px, transparent 50%);
      background-attachment: fixed;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      transition: all 0.3s ease;
    }

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

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

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

    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }

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

    .nav-links li a {
      display: inline-block;
      padding: 8px 14px;
      color: var(--text-muted);
      text-decoration: none;
      font-weight: 500;
      font-size: 0.95rem;
      transition: color 0.2s ease;
    }

    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
    }

    .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;
      transition: all 0.25s ease;
      cursor: pointer;
      border: 1px solid transparent;
    }

    .btn-primary {
      background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(79, 70, 229, 0.25);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(79, 70, 229, 0.35);
      color: #ffffff;
    }

    .btn-rainbow {
      background: linear-gradient(135deg, #ec4899 0%, #8b5cf6 50%, #06b6d4 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(236, 72, 153, 0.3);
    }

    .btn-rainbow:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(236, 72, 153, 0.45);
      color: #ffffff;
    }

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

    .btn-outline:hover {
      border-color: var(--primary);
      color: var(--primary);
      background: #f8fafc;
    }

    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      cursor: pointer;
      color: var(--text-main);
      padding: 4px;
    }

    /* 区域通用样式 */
    section {
      padding: 80px 0;
      position: relative;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 50px;
    }

    .section-badge {
      display: inline-block;
      padding: 6px 14px;
      border-radius: 9999px;
      font-size: 0.82rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.5px;
      margin-bottom: 14px;
    }

    .badge-primary { background: #e0e7ff; color: #4338ca; }
    .badge-pink { background: #fce7f3; color: #db2777; }
    .badge-cyan { background: #cffafe; color: #0891b2; }
    .badge-amber { background: #fef3c7; color: #d97706; }
    .badge-emerald { background: #d1fae5; color: #059669; }
    .badge-purple { background: #ede9fe; color: #6d28d9; }

    .section-title {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
    }

    /* Hero 首屏 (无图规范) */
    .hero-section {
      padding: 90px 0 60px;
      text-align: center;
      background: radial-gradient(circle at center, rgba(238, 242, 255, 0.8) 0%, rgba(248, 250, 252, 0) 70%);
    }

    .hero-content {
      max-width: 880px;
      margin: 0 auto;
    }

    .hero-badge-group {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1.25;
      color: #0f172a;
      margin-bottom: 22px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 1.18rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
    }

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

    .hero-btn-group .btn {
      padding: 14px 32px;
      font-size: 1.05rem;
    }

    .hero-features-ribbon {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 20px;
      background: #ffffff;
      padding: 24px;
      border-radius: 16px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-xl);
    }

    .ribbon-item {
      display: flex;
      align-items: center;
      gap: 12px;
      text-align: left;
    }

    .ribbon-icon {
      width: 44px;
      height: 44px;
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.1rem;
      flex-shrink: 0;
    }

    .ribbon-text h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
    }

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

    /* 数据指标卡片 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      margin-top: -30px;
      position: relative;
      z-index: 10;
    }

    .metric-card {
      background: #ffffff;
      padding: 28px 20px;
      border-radius: 14px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: transform 0.25s ease;
    }

    .metric-card:hover {
      transform: translateY(-4px);
    }

    .metric-value {
      font-size: 2.2rem;
      font-weight: 800;
      margin-bottom: 6px;
    }

    .metric-label {
      font-size: 0.9rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台介绍 & 关于我们 */
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }

    .about-info h3 {
      font-size: 1.8rem;
      font-weight: 800;
      margin-bottom: 18px;
      line-height: 1.35;
    }

    .about-info p {
      color: var(--text-muted);
      margin-bottom: 20px;
      font-size: 1rem;
    }

    .about-highlights {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-top: 24px;
    }

    .highlight-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      padding: 16px;
      border-radius: 10px;
    }

    .highlight-box h4 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 6px;
    }

    .highlight-box p {
      font-size: 0.85rem;
      color: var(--text-muted);
      margin-bottom: 0;
    }

    .media-card-wrap {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .media-card-wrap img {
      border-radius: 14px;
      width: 100%;
      height: auto;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }

    /* AIGC 服务矩阵 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .service-card {
      background: #ffffff;
      border-radius: 14px;
      padding: 28px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .service-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow-xl);
      border-color: rgba(99, 102, 241, 0.3);
    }

    .service-tag {
      font-size: 0.75rem;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: 6px;
      display: inline-block;
      margin-bottom: 16px;
      width: fit-content;
    }

    .service-card h3 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .service-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 模型支持标签云 */
    .models-cloud-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 16px;
      padding: 36px;
      text-align: center;
      margin-top: 40px;
    }

    .models-cloud-wrap h4 {
      font-size: 1.15rem;
      margin-bottom: 20px;
      color: var(--text-main);
    }

    .tag-cloud {
      display: flex;
      flex-wrap: wrap;
      justify-content: center;
      gap: 10px;
    }

    .tag-item {
      padding: 6px 14px;
      border-radius: 8px;
      font-size: 0.85rem;
      font-weight: 600;
      background: #f1f5f9;
      color: #334155;
      border: 1px solid #e2e8f0;
      transition: all 0.2s ease;
    }

    .tag-item:hover {
      background: #4f46e5;
      color: #ffffff;
      border-color: #4f46e5;
    }

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

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

    .timeline-step {
      font-size: 1.8rem;
      font-weight: 900;
      color: #cbd5e1;
      margin-bottom: 8px;
    }

    .timeline-card h4 {
      font-size: 1.1rem;
      margin-bottom: 10px;
    }

    .timeline-card p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 对比评测 */
    .rating-banner {
      background: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
      color: #ffffff;
      border-radius: 16px;
      padding: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 30px;
      box-shadow: var(--shadow-md);
    }

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

    .score-num {
      font-size: 3.5rem;
      font-weight: 900;
      color: #facc15;
      line-height: 1;
    }

    .score-meta h4 {
      font-size: 1.25rem;
      margin-bottom: 4px;
    }

    .stars {
      color: #facc15;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }

    .comparison-table-wrapper {
      background: #ffffff;
      border-radius: 14px;
      border: 1px solid var(--border-color);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 650px;
    }

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

    .comparison-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
      font-size: 0.95rem;
    }

    .comparison-table tr:hover td {
      background: #f8fafc;
    }

    .highlight-col {
      background: #eff6ff;
      font-weight: 600;
      color: var(--primary);
    }

    /* 案例中心 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .case-card {
      background: #ffffff;
      border-radius: 14px;
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }

    .case-card-img-wrap {
      width: 100%;
      height: 200px;
      overflow: hidden;
      background: #f1f5f9;
    }

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

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

    .case-body {
      padding: 20px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

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

    .case-body p {
      font-size: 0.88rem;
      color: var(--text-muted);
      margin-bottom: 16px;
      flex-grow: 1;
    }

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

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

    .review-quote {
      font-size: 0.92rem;
      color: #334155;
      line-height: 1.6;
      margin-bottom: 20px;
    }

    .review-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #f1f5f9;
      padding-top: 14px;
    }

    .author-avatar {
      width: 40px;
      height: 40px;
      border-radius: 50%;
      background: linear-gradient(135deg, #6366f1, #a855f7);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }

    .author-meta h5 {
      font-size: 0.9rem;
      font-weight: 700;
    }

    .author-meta span {
      font-size: 0.78rem;
      color: var(--text-muted);
    }

    /* 需求匹配表单与联系 */
    .form-contact-wrap {
      display: grid;
      grid-template-columns: 3fr 2fr;
      gap: 36px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 20px;
      padding: 40px;
      box-shadow: var(--shadow-xl);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-size: 0.9rem;
      font-weight: 600;
      margin-bottom: 8px;
      color: var(--text-main);
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      font-size: 0.95rem;
      background: #f8fafc;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s ease;
    }

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

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

    .contact-info-panel {
      background: #f8fafc;
      border-radius: 14px;
      padding: 28px;
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      gap: 20px;
    }

    .contact-info-item {
      display: flex;
      gap: 12px;
      align-items: flex-start;
    }

    .contact-info-item h5 {
      font-size: 0.95rem;
      margin-bottom: 4px;
    }

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

    .qr-box {
      text-align: center;
      background: #ffffff;
      padding: 16px;
      border-radius: 10px;
      border: 1px solid var(--border-color);
    }

    .qr-box img {
      max-width: 140px;
      height: auto;
      border-radius: 6px;
    }

    /* FAQ 折叠面板 */
    .faq-accordion {
      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: 12px;
      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: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      font-weight: 400;
      transition: transform 0.3s ease;
    }

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

    .faq-answer {
      padding: 0 24px 18px;
      color: var(--text-muted);
      font-size: 0.92rem;
      line-height: 1.6;
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* 文章列表 & 友情链接 */
    .articles-links-box {
      background: #ffffff;
      border-radius: 14px;
      border: 1px solid var(--border-color);
      padding: 28px;
      margin-top: 30px;
    }

    .articles-links-box h4 {
      font-size: 1.1rem;
      margin-bottom: 16px;
      padding-bottom: 10px;
      border-bottom: 1px solid var(--border-color);
    }

    .article-url-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      list-style: none;
      margin-bottom: 24px;
    }

    .article-url-list li a,
    .friend-links-list a {
      display: inline-block;
      padding: 6px 14px;
      border-radius: 6px;
      background: #f1f5f9;
      color: #334155;
      text-decoration: none;
      font-size: 0.88rem;
      transition: all 0.2s ease;
    }

    .article-url-list li a:hover,
    .friend-links-list a:hover {
      background: var(--primary);
      color: #ffffff;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
    }

    /* 页脚规范 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 40px 0 24px;
      color: var(--text-muted);
      font-size: 0.88rem;
    }

    .footer-main {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
      padding-bottom: 24px;
      border-bottom: 1px solid #f1f5f9;
    }

    .footer-brand-side {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .footer-copy-side {
      text-align: right;
    }

    /* 浮动客服 */
    .floating-contact-btn {
      position: fixed;
      right: 24px;
      bottom: 24px;
      z-index: 990;
      background: linear-gradient(135deg, #4f46e5, #ec4899);
      color: #ffffff;
      width: 56px;
      height: 56px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.85rem;
      box-shadow: var(--shadow-xl);
      cursor: pointer;
      text-decoration: none;
      transition: transform 0.25s ease;
    }

    .floating-contact-btn:hover {
      transform: scale(1.08);
      color: #ffffff;
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .services-grid,
      .cases-grid,
      .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .about-grid,
      .form-contact-wrap {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 2.2rem;
      }
    }

    @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-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 12px 0;
      }
      .services-grid,
      .cases-grid,
      .reviews-grid,
      .timeline-grid,
      .metrics-grid {
        grid-template-columns: 1fr;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .rating-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
      }
      .footer-main {
        flex-direction: column;
        align-items: flex-start;
      }
      .footer-copy-side {
        text-align: left;
      }
    }