:root {
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --primary-light: #eff6ff;
      --secondary: #0891b2;
      --accent: #f59e0b;
      --bg-page: #f8fafc;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-muted: #475569;
      --border-color: #e2e8f0;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
      --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.03);
      --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-page);
      color: var(--text-main);
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.2s ease;
    }

    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(10px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap img.ai-page-logo {
      height: 38px;
      width: auto;
      display: block;
    }
    .brand-text {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      list-style: none;
    }
    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: 6px;
    }
    .nav-links li a:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }
    .header-action {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 8px;
      font-size: 0.95rem;
      font-weight: 600;
      background: var(--primary);
      color: #ffffff;
      border: 1px solid var(--primary);
      transition: all 0.25s ease;
      cursor: pointer;
    }
    .btn-main:hover {
      background: var(--primary-hover);
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
      transform: translateY(-1px);
    }
    .menu-toggle {
      display: none;
      background: transparent;
      border: 1px solid var(--border-color);
      padding: 8px;
      border-radius: 6px;
      cursor: pointer;
    }

    /* 首屏 Hero 无图区域 */
    .hero-section {
      padding: 90px 0 80px;
      background: linear-gradient(135deg, #ffffff 0%, #f0f7ff 100%);
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }
    .hero-content {
      max-width: 860px;
      margin: 0 auto;
      text-align: center;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 16px;
      background: #e0e7ff;
      color: #3730a3;
      border-radius: 999px;
      font-size: 0.85rem;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 2.75rem;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }
    .hero-desc {
      font-size: 1.15rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 36px;
    }
    .hero-btn-group {
      display: flex;
      justify-content: center;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 50px;
    }
    .btn-lg {
      padding: 14px 34px;
      font-size: 1.05rem;
      border-radius: 10px;
    }
    .btn-secondary {
      background: #ffffff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      font-weight: 600;
    }
    .btn-secondary:hover {
      background: #f1f5f9;
      border-color: #cbd5e1;
    }
    .hero-stats-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 20px;
      padding-top: 40px;
      border-top: 1px dashed #cbd5e1;
    }
    .stat-box {
      background: #ffffff;
      padding: 20px 16px;
      border-radius: 10px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .stat-box .num {
      font-size: 1.6rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .stat-box .label {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* 通用区块排版 */
    .section-wrap {
      padding: 80px 0;
      position: relative;
    }
    .section-bg-alt {
      background-color: #ffffff;
    }
    .section-header {
      text-align: center;
      max-width: 720px;
      margin: 0 auto 56px;
    }
    .section-tag {
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      color: var(--primary);
      letter-spacing: 1px;
      margin-bottom: 10px;
      display: block;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }
    .section-subtitle {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 平台介绍 & 支撑矩阵 */
    .platform-intro-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .intro-text-box h3 {
      font-size: 1.6rem;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .intro-text-box p {
      color: var(--text-muted);
      margin-bottom: 16px;
      font-size: 1rem;
    }
    .feature-check-list {
      list-style: none;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 12px;
      margin-top: 24px;
    }
    .feature-check-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.9rem;
      color: var(--text-main);
      font-weight: 600;
    }
    .feature-check-list li::before {
      content: "✔";
      color: #10b981;
      font-size: 0.9rem;
    }
    .model-tags-container {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      box-shadow: var(--shadow-sm);
    }
    .model-tags-title {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 16px;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .tags-cloud {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }
    .tag-chip {
      background: var(--bg-page);
      border: 1px solid var(--border-color);
      padding: 6px 12px;
      border-radius: 6px;
      font-size: 0.85rem;
      color: var(--text-main);
      font-weight: 500;
      transition: all 0.2s;
    }
    .tag-chip:hover {
      background: var(--primary-light);
      border-color: var(--primary);
      color: var(--primary);
    }

    /* 服务场景网格 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: var(--bg-card);
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 28px;
      transition: transform 0.25s ease, box-shadow 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
      border-color: #cbd5e1;
    }
    .service-icon {
      width: 48px;
      height: 48px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
    }
    .service-card h4 {
      font-size: 1.15rem;
      font-weight: 700;
      margin-bottom: 10px;
    }
    .service-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      flex-grow: 1;
    }

    /* 一站式制作工作流 */
    .process-steps-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .step-item {
      background: var(--bg-card);
      padding: 26px;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      text-align: left;
    }
    .step-badge {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary);
      opacity: 0.4;
      margin-bottom: 12px;
    }
    .step-item h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-item p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 案例图片展示 */
    .case-gallery-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      align-items: stretch;
    }
    .case-media-box {
      border-radius: var(--radius);
      overflow: hidden;
      border: 1px solid var(--border-color);
      background: #ffffff;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .case-media-box img {
      width: 100%;
      height: 240px;
      object-fit: cover;
      display: block;
    }
    .case-info {
      padding: 20px;
    }
    .case-info h4 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .case-info p {
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .sub-cases-col {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }
    .sub-case-item {
      display: flex;
      gap: 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 16px;
      align-items: center;
      box-shadow: var(--shadow-sm);
    }
    .sub-case-item img {
      width: 110px;
      height: 80px;
      object-fit: cover;
      border-radius: 8px;
      flex-shrink: 0;
    }

    /* 评测与对比表格 */
    .review-score-banner {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 30px;
      margin-bottom: 30px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      box-shadow: var(--shadow-sm);
      flex-wrap: wrap;
      gap: 20px;
    }
    .score-summary {
      display: flex;
      align-items: center;
      gap: 24px;
    }
    .score-big {
      font-size: 3rem;
      font-weight: 900;
      color: var(--accent);
      line-height: 1;
    }
    .score-meta h4 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 4px;
    }
    .score-stars {
      color: var(--accent);
      font-size: 1.1rem;
      letter-spacing: 2px;
    }
    .table-container {
      overflow-x: auto;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }
    .comparison-table th, 
    .comparison-table td {
      padding: 18px 24px;
      border-bottom: 1px solid var(--border-color);
    }
    .comparison-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }
    .comparison-table tr:last-child td {
      border-bottom: none;
    }
    .highlight-col {
      background: rgba(37, 99, 235, 0.03);
      color: var(--primary);
      font-weight: 600;
    }

    /* 用户评论 */
    .testimonials-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testimonial-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .t-quote {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 20px;
    }
    .t-author-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .t-avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }
    .t-name {
      font-weight: 700;
      font-size: 0.95rem;
    }
    .t-role {
      font-size: 0.8rem;
      color: var(--text-muted);
    }

    /* 需求匹配与表单 */
    .form-section-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 40px;
      align-items: flex-start;
      background: #ffffff;
      border-radius: var(--radius);
      padding: 40px;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .form-guide-col h3 {
      font-size: 1.6rem;
      margin-bottom: 16px;
      font-weight: 800;
    }
    .form-guide-col p {
      color: var(--text-muted);
      margin-bottom: 24px;
      font-size: 0.95rem;
    }
    .contact-direct-items {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .contact-item-row {
      display: flex;
      align-items: center;
      gap: 14px;
      font-size: 0.95rem;
    }
    .contact-item-row span.label {
      font-weight: 600;
      color: var(--text-muted);
      width: 80px;
    }
    .demand-form {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group label {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .form-control {
      width: 100%;
      padding: 12px 14px;
      border-radius: 8px;
      border: 1px solid var(--border-color);
      font-size: 0.95rem;
      outline: none;
      background: #fdfdfd;
      font-family: inherit;
    }
    .form-control:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
      background: #ffffff;
    }
    textarea.form-control {
      resize: vertical;
      min-height: 90px;
    }

    /* FAQ 手风琴 */
    .faq-accordion-list {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .faq-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: 8px;
      overflow: hidden;
      transition: border-color 0.2s;
    }
    .faq-header {
      padding: 18px 20px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      font-weight: 600;
      color: var(--text-main);
    }
    .faq-header:hover {
      background: #f8fafc;
    }
    .faq-icon-arrow {
      font-size: 0.8rem;
      transition: transform 0.25s ease;
    }
    .faq-body {
      display: none;
      padding: 0 20px 18px;
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.6;
      border-top: 1px solid #f1f5f9;
      margin-top: -4px;
      padding-top: 14px;
    }
    .faq-item.active .faq-body {
      display: block;
    }
    .faq-item.active .faq-icon-arrow {
      transform: rotate(180deg);
    }

    /* 资讯与友情链接 */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }
    .news-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
      padding: 20px;
      box-shadow: var(--shadow-sm);
    }
    .news-card h4 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 8px;
      line-height: 1.4;
    }
    .news-links-collection {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 24px;
      padding: 16px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius);
    }
    .news-links-collection a {
      font-size: 0.85rem;
      color: var(--primary);
      text-decoration: underline;
    }

    .friendly-links-bar {
      padding: 24px;
      background: #ffffff;
      border-radius: var(--radius);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      gap: 16px;
      flex-wrap: wrap;
    }
    .friendly-links-bar span {
      font-weight: 700;
      font-size: 0.9rem;
      color: var(--text-main);
    }
    .friendly-links-bar a {
      font-size: 0.85rem;
      color: var(--text-muted);
    }
    .friendly-links-bar a:hover {
      color: var(--primary);
    }

    /* 悬浮客服面板 */
    .float-kefu-container {
      position: fixed;
      right: 24px;
      bottom: 40px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      align-items: flex-end;
      gap: 10px;
    }
    .float-kefu-btn {
      width: 50px;
      height: 50px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.25rem;
      box-shadow: 0 4px 14px rgba(37, 99, 235, 0.4);
      cursor: pointer;
      transition: transform 0.2s ease;
    }
    .float-kefu-btn:hover {
      transform: scale(1.08);
    }
    .float-qr-modal {
      display: none;
      background: #ffffff;
      padding: 16px;
      border-radius: 12px;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--border-color);
      text-align: center;
      width: 170px;
    }
    .float-qr-modal img {
      width: 130px;
      height: 130px;
      display: block;
      margin: 0 auto 8px;
    }
    .float-qr-modal p {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* 页脚 */
    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 50px 0 30px;
      color: var(--text-muted);
      font-size: 0.85rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 36px;
      margin-bottom: 40px;
    }
    .footer-col h5 {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 14px;
    }
    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-col ul li 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;
      flex-wrap: wrap;
      gap: 12px;
    }

    /* 响应式媒体查询 */
    @media (max-width: 1024px) {
      .services-grid, 
      .testimonials-grid, 
      .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .process-steps-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-stats-row {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 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;
        border-bottom: 1px solid var(--border-color);
        padding: 16px 24px;
        box-shadow: var(--shadow-md);
      }
      .nav-links.active {
        display: flex;
      }
      .hero-title {
        font-size: 1.9rem;
      }
      .platform-intro-grid, 
      .case-gallery-grid, 
      .form-section-container {
        grid-template-columns: 1fr;
      }
      .services-grid, 
      .testimonials-grid, 
      .news-grid, 
      .process-steps-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .review-score-banner {
        flex-direction: column;
        align-items: flex-start;
      }
      .sub-cases-col {
        flex-direction: column;
      }
    }