:root {
      --primary: #2563eb;
      --primary-hover: #1d4ed8;
      --primary-light: #eff6ff;
      --accent: #f97316;
      --accent-hover: #ea580c;
      --text-main: #0f172a;
      --text-muted: #475569;
      --text-sub: #64748b;
      --bg-page: #f8fafc;
      --bg-surface: #ffffff;
      --bg-subtle: #f1f5f9;
      --border-color: #e2e8f0;
      --border-light: #f1f5f9;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
      --shadow-md: 0 4px 16px -2px rgba(15,23,42,0.08);
      --shadow-lg: 0 12px 30px -4px rgba(37,99,235,0.12);
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
      --container-max: 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: 1.65;
      overflow-x: hidden;
      min-width: 320px;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: color 0.25s ease;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    .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, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 10px rgba(0,0,0,0.03);
    }
    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
    }
    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .brand-wrap .ai-page-logo {
      height: 40px;
      width: auto;
      object-fit: contain;
    }
    .brand-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }
    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-muted);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      display: inline-block;
    }
    .nav-links li a:hover,
    .nav-links li a.active {
      color: var(--primary);
      background: var(--primary-light);
    }
    .header-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: 30px;
      cursor: pointer;
      transition: all 0.25s ease;
      border: 1px solid transparent;
      white-space: nowrap;
    }
    .btn-primary {
      background: var(--primary);
      color: #ffffff;
      box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
    }
    .btn-primary:hover {
      background: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(37, 99, 235, 0.35);
    }
    .btn-outline {
      border-color: var(--primary);
      color: var(--primary);
      background: #ffffff;
    }
    .btn-outline:hover {
      background: var(--primary-light);
    }
    .btn-accent {
      background: linear-gradient(135deg, #f97316 0%, #ea580c 100%);
      color: #ffffff;
      box-shadow: 0 4px 14px rgba(249, 115, 22, 0.3);
    }
    .btn-accent:hover {
      opacity: 0.95;
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(249, 115, 22, 0.4);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px;
    }

    /* 首屏纯文字与几何美学 */
    .hero-section {
      background: radial-gradient(circle at top right, #e0f2fe 0%, #ffffff 60%, #f0fdf4 100%);
      padding: 90px 0 70px;
      border-bottom: 1px solid var(--border-color);
      position: relative;
      overflow: hidden;
    }
    .hero-badge-wrap {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(37, 99, 235, 0.08);
      border: 1px solid rgba(37, 99, 235, 0.2);
      padding: 6px 16px;
      border-radius: 50px;
      margin-bottom: 24px;
    }
    .hero-badge-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background: #10b981;
      box-shadow: 0 0 8px #10b981;
    }
    .hero-badge-text {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
    }
    .hero-title {
      font-size: clamp(2rem, 4.5vw, 3.25rem);
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -1px;
    }
    .hero-title span {
      background: linear-gradient(135deg, #1d4ed8 0%, #0284c7 50%, #f97316 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }
    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 820px;
      margin-bottom: 36px;
      line-height: 1.8;
    }
    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      gap: 16px;
      margin-bottom: 48px;
    }
    .hero-stats-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 20px;
    }
    .stat-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .stat-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .stat-num {
      font-size: 2.25rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
      font-family: inherit;
    }
    .stat-label {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .stat-desc {
      font-size: 0.825rem;
      color: var(--text-sub);
    }

    /* 通用模块结构 */
    .section-wrap {
      padding: 85px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .section-wrap:nth-child(even) {
      background-color: var(--bg-surface);
    }
    .section-wrap:nth-child(odd) {
      background-color: var(--bg-page);
    }
    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 52px;
    }
    .section-subtitle {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 12px;
    }
    .section-title {
      font-size: 2.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
      line-height: 1.35;
    }
    .section-desc {
      font-size: 1rem;
      color: var(--text-muted);
      line-height: 1.75;
    }

    /* 平台介绍板块 */
    .intro-grid {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 40px;
      align-items: center;
    }
    .intro-text-box h3 {
      font-size: 1.6rem;
      color: var(--text-main);
      margin-bottom: 18px;
      font-weight: 700;
    }
    .intro-text-box p {
      font-size: 0.975rem;
      color: var(--text-muted);
      margin-bottom: 16px;
      line-height: 1.8;
    }
    .intro-features-list {
      list-style: none;
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 14px;
      margin-top: 24px;
    }
    .intro-features-list li {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.9rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .intro-features-list li::before {
      content: "✓";
      color: #10b981;
      font-weight: 900;
      background: #ecfdf5;
      width: 20px;
      height: 20px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.75rem;
    }
    .intro-visual-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: var(--shadow-md);
      position: relative;
    }
    .model-chips {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: 18px;
    }
    .chip {
      background: var(--bg-subtle);
      border: 1px solid var(--border-color);
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--text-main);
      padding: 5px 11px;
      border-radius: 6px;
      transition: all 0.2s ease;
    }
    .chip:hover {
      background: var(--primary);
      color: #ffffff;
      border-color: var(--primary);
    }

    /* 服务能力卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
      gap: 24px;
    }
    .service-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .service-card:hover {
      border-color: #93c5fd;
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .service-card-tag {
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--primary);
      background: var(--primary-light);
      padding: 4px 10px;
      border-radius: 4px;
      align-self: flex-start;
      margin-bottom: 16px;
    }
    .service-card h4 {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .service-card p {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
    }
    .service-card-footer {
      border-top: 1px dashed var(--border-color);
      padding-top: 14px;
      font-size: 0.825rem;
      color: var(--text-sub);
      display: flex;
      align-items: center;
      justify-content: space-between;
    }

    /* 一站式制作工坊 */
    .workshop-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(270px, 1fr));
      gap: 20px;
    }
    .workshop-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      transition: all 0.2s;
    }
    .workshop-item:hover {
      border-color: var(--accent);
      box-shadow: var(--shadow-sm);
    }
    .workshop-item h5 {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .workshop-item p {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 流程步骤 */
    .process-timeline {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
      gap: 24px;
      position: relative;
    }
    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px 20px;
      position: relative;
    }
    .step-num {
      width: 36px;
      height: 36px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 1rem;
      margin-bottom: 16px;
    }
    .step-card h5 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .step-card p {
      font-size: 0.875rem;
      color: var(--text-muted);
    }

    /* 对比评测表格与评级 */
    .rating-banner {
      background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
      color: #ffffff;
      border-radius: var(--radius-lg);
      padding: 36px;
      margin-bottom: 32px;
      display: flex;
      flex-wrap: wrap;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }
    .rating-score-box {
      display: flex;
      align-items: center;
      gap: 20px;
    }
    .score-big {
      font-size: 3.5rem;
      font-weight: 900;
      line-height: 1;
      color: #38bdf8;
    }
    .rating-meta h4 {
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 6px;
    }
    .stars {
      color: #fbbf24;
      font-size: 1.2rem;
      letter-spacing: 2px;
    }
    .rating-desc {
      max-width: 500px;
      font-size: 0.925rem;
      color: #cbd5e1;
    }
    .table-container {
      width: 100%;
      overflow-x: auto;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      background: #ffffff;
      box-shadow: var(--shadow-sm);
    }
    .comparison-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      min-width: 680px;
    }
    .comparison-table th,
    .comparison-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.925rem;
    }
    .comparison-table th {
      background: #f8fafc;
      font-weight: 700;
      color: var(--text-main);
    }
    .comparison-table tr:last-child td {
      border-bottom: none;
    }
    .comparison-table .highlight-col {
      background: #eff6ff;
      color: var(--primary);
      font-weight: 700;
    }
    .comparison-table th.highlight-col {
      background: #dbeafe;
      color: #1e40af;
    }

    /* 案例中心展示 */
    .case-gallery-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
      gap: 24px;
    }
    .case-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: transform 0.25s ease;
    }
    .case-item:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .case-img-box {
      aspect-ratio: 16 / 9;
      background: #f1f5f9;
      overflow: hidden;
    }
    .case-img-box.square {
      aspect-ratio: 1 / 1;
    }
    .case-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-content {
      padding: 20px;
    }
    .case-content h5 {
      font-size: 1.1rem;
      font-weight: 700;
      margin-bottom: 8px;
    }
    .case-content p {
      font-size: 0.875rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 客户真实评价 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
      gap: 24px;
    }
    .review-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .review-user-info {
      display: flex;
      align-items: center;
      gap: 14px;
      margin-bottom: 16px;
    }
    .user-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: 1rem;
    }
    .user-meta h6 {
      font-size: 0.95rem;
      font-weight: 700;
    }
    .user-meta span {
      font-size: 0.8rem;
      color: var(--text-sub);
    }
    .review-text {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 资讯与百科文章 */
    .articles-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 32px;
    }
    .article-box {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
    }
    .article-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 16px;
      margin-top: 18px;
    }
    .article-links-list li {
      padding-bottom: 14px;
      border-bottom: 1px solid var(--border-light);
    }
    .article-links-list li:last-child {
      border-bottom: none;
      padding-bottom: 0;
    }
    .article-links-list a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-main);
      display: block;
    }
    .article-links-list a:hover {
      color: var(--primary);
    }

    /* FAQ 折叠面板 */
    .faq-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: var(--radius-sm);
      overflow: hidden;
      transition: border-color 0.2s;
    }
    .faq-item.active {
      border-color: var(--primary);
    }
    .faq-question {
      padding: 18px 24px;
      font-size: 1rem;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }
    .faq-icon {
      font-size: 1.25rem;
      color: var(--primary);
      transition: transform 0.25s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #fafafa;
      color: var(--text-muted);
      font-size: 0.925rem;
      line-height: 1.7;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px 20px;
    }

    /* 表单与联系 */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 40px;
    }
    .contact-card-info {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
    }
    .contact-meta-row {
      margin-bottom: 24px;
    }
    .contact-meta-row h5 {
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 6px;
      color: var(--text-main);
    }
    .contact-meta-row p {
      font-size: 0.925rem;
      color: var(--text-muted);
    }
    .qr-box {
      width: 140px;
      border: 1px solid var(--border-color);
      padding: 8px;
      border-radius: var(--radius-sm);
      margin-top: 10px;
      background: #ffffff;
    }
    .contact-form-wrap {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 36px;
      box-shadow: var(--shadow-sm);
    }
    .form-group {
      margin-bottom: 20px;
    }
    .form-label {
      display: block;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 0.95rem;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background: #ffffff;
      color: var(--text-main);
      transition: border-color 0.2s, box-shadow 0.2s;
    }
    .form-control:focus {
      outline: none;
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }
    textarea.form-control {
      resize: vertical;
      min-height: 110px;
    }

    /* 友情链接与页脚 */
    .links-section {
      padding: 32px 0;
      background: #ffffff;
      border-bottom: 1px solid var(--border-color);
    }
    .links-title {
      font-size: 0.9rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .friend-links-box {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }
    .friend-links-box a {
      font-size: 0.85rem;
      color: var(--text-sub);
      text-decoration: none;
    }
    .friend-links-box a:hover {
      color: var(--primary);
    }
    .site-footer {
      background: #0f172a;
      color: #94a3b8;
      padding: 50px 0 30px;
    }
    .footer-inner {
      display: flex;
      flex-wrap: wrap;
      justify-content: space-between;
      align-items: center;
      gap: 20px;
      padding-bottom: 30px;
      border-bottom: 1px solid #1e293b;
    }
    .footer-brand {
      color: #ffffff;
      font-size: 1.15rem;
      font-weight: 700;
    }
    .footer-copy {
      text-align: center;
      padding-top: 24px;
      font-size: 0.825rem;
      color: #64748b;
    }

    /* 悬浮客服面板 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .widget-btn {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--primary);
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(0,0,0,0.15);
      cursor: pointer;
      border: none;
      transition: transform 0.2s;
      font-size: 1.2rem;
    }
    .widget-btn:hover {
      transform: scale(1.08);
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .intro-grid,
      .contact-layout,
      .articles-grid {
        grid-template-columns: 1fr;
      }
      .services-grid {
        grid-template-columns: 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;
        align-items: flex-start;
        padding: 20px 24px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        border-bottom: 1px solid var(--border-color);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li {
        width: 100%;
      }
      .nav-links li a {
        display: block;
        padding: 10px 0;
      }
      .header-actions .btn-outline {
        display: none;
      }
      .hero-title {
        font-size: 2.1rem;
      }
    }