:root {
      --primary: #4f46e5;
      --primary-hover: #4338ca;
      --secondary: #ec4899;
      --accent-yellow: #fbbf24;
      --accent-teal: #06b6d4;
      --accent-green: #10b981;
      --dark-text: #1e293b;
      --light-text: #64748b;
      --bg-main: #fafaf9;
      --bg-card: #ffffff;
      --border-color: #e2e8f0;
      --border-doodle: #0f172a;
      --shadow-doodle: 4px 4px 0px #0f172a;
      --shadow-doodle-hover: 6px 6px 0px #0f172a;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

    * {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
      outline: none;
    }

    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(--dark-text);
      line-height: 1.6;
      overflow-x: hidden;
      background-image: radial-gradient(#cbd5e1 1px, transparent 1px);
      background-size: 24px 24px;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

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

    /* 顶部导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(8px);
      border-bottom: 2px solid var(--border-doodle);
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 72px;
      gap: 16px;
    }

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-weight: 800;
      font-size: 1.25rem;
      color: var(--dark-text);
    }

    .brand-logo img.ai-page-logo {
      height: 40px;
      width: auto;
      max-width: 100%;
    }

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

    .nav-links li a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--dark-text);
      padding: 8px 12px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
      display: inline-block;
    }

    .nav-links li a:hover {
      background-color: #fee2e2;
      color: #b91c1c;
    }

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

    .btn-doodle {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 20px;
      font-weight: 700;
      font-size: 0.95rem;
      border-radius: var(--radius-sm);
      border: 2px solid var(--border-doodle);
      background-color: var(--accent-yellow);
      color: var(--dark-text);
      box-shadow: var(--shadow-doodle);
      cursor: pointer;
      transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.2s ease;
      white-space: nowrap;
    }

    .btn-doodle:hover {
      transform: translate(-2px, -2px);
      box-shadow: var(--shadow-doodle-hover);
    }

    .btn-doodle:active {
      transform: translate(2px, 2px);
      box-shadow: 2px 2px 0px #0f172a;
    }

    .btn-primary-doodle {
      background-color: #ff5470;
      color: #ffffff;
    }

    .btn-cyan-doodle {
      background-color: var(--accent-teal);
      color: #ffffff;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: 2px solid var(--border-doodle);
      padding: 6px 10px;
      border-radius: 6px;
      font-weight: bold;
      cursor: pointer;
    }

    /* 区域通用规范 */
    .section-padding {
      padding: 70px 0;
    }

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

    .badge-doodle {
      display: inline-block;
      padding: 4px 14px;
      font-size: 0.85rem;
      font-weight: 800;
      text-transform: uppercase;
      border-radius: 50px;
      border: 2px solid var(--border-doodle);
      background-color: #e0e7ff;
      color: #3730a3;
      margin-bottom: 12px;
      box-shadow: 2px 2px 0px var(--border-doodle);
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--dark-text);
      margin-bottom: 14px;
      line-height: 1.3;
    }

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

    /* 首屏 Hero (无图，纯CSS涂鸦风格) */
    .hero-section {
      padding: 70px 0 60px;
      background: linear-gradient(180deg, rgba(254, 243, 199, 0.4) 0%, rgba(250, 250, 249, 1) 100%);
      border-bottom: 2px dashed #94a3b8;
    }

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

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background-color: #fef08a;
      border: 2px solid var(--border-doodle);
      padding: 6px 16px;
      border-radius: 20px;
      font-weight: 700;
      font-size: 0.9rem;
      box-shadow: 3px 3px 0px var(--border-doodle);
      margin-bottom: 24px;
    }

    .hero-title {
      font-size: 2.6rem;
      font-weight: 900;
      color: #0f172a;
      line-height: 1.25;
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: #475569;
      margin-bottom: 34px;
      line-height: 1.7;
    }

    .hero-actions {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 18px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .hero-features-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 20px;
    }

    .hero-stat-card {
      background: #ffffff;
      border: 2px solid var(--border-doodle);
      padding: 16px 12px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-doodle);
      text-align: center;
    }

    .hero-stat-num {
      font-size: 1.4rem;
      font-weight: 900;
      color: #2563eb;
      margin-bottom: 4px;
    }

    .hero-stat-text {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--light-text);
    }

    /* 标签云滚动 / 聚合模型 */
    .model-strip {
      background: #ffffff;
      border-top: 2px solid var(--border-doodle);
      border-bottom: 2px solid var(--border-doodle);
      padding: 16px 0;
      overflow: hidden;
    }

    .model-tags-container {
      display: flex;
      gap: 12px;
      flex-wrap: wrap;
      justify-content: center;
    }

    .model-tag {
      background: #f1f5f9;
      border: 1.5px solid var(--border-doodle);
      padding: 4px 12px;
      border-radius: 6px;
      font-size: 0.85rem;
      font-weight: 700;
      color: #334155;
      box-shadow: 2px 2px 0px rgba(15, 23, 42, 0.15);
    }

    /* 卡片通用 */
    .doodle-card {
      background: var(--bg-card);
      border: 2px solid var(--border-doodle);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-doodle);
      transition: transform 0.2s ease, box-shadow 0.2s ease;
      height: 100%;
      display: flex;
      flex-direction: column;
    }

    .doodle-card:hover {
      transform: translate(-3px, -3px);
      box-shadow: var(--shadow-doodle-hover);
    }

    /* 服务网格 */
    .grid-3 {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .grid-4 {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }

    .grid-2 {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 28px;
    }

    .service-card-title {
      font-size: 1.2rem;
      font-weight: 800;
      margin-bottom: 10px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .service-card-desc {
      font-size: 0.95rem;
      color: #475569;
      flex-grow: 1;
      margin-bottom: 16px;
      line-height: 1.55;
    }

    .service-tag {
      align-self: flex-start;
      font-size: 0.75rem;
      font-weight: 700;
      background: #fef3c7;
      padding: 3px 8px;
      border-radius: 4px;
      border: 1px solid var(--border-doodle);
      color: #92400e;
    }

    /* 图文混排媒体卡片 */
    .media-card-img-wrap {
      border: 2px solid var(--border-doodle);
      border-radius: var(--radius-sm);
      overflow: hidden;
      margin-bottom: 16px;
      background: #e2e8f0;
    }

    .media-card-img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }

    .media-card-img-wrap:hover img {
      transform: scale(1.03);
    }

    /* 对比表格 */
    .table-container {
      background: #ffffff;
      border: 2px solid var(--border-doodle);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-doodle);
      overflow-x: auto;
    }

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

    .doodle-table th, .doodle-table td {
      padding: 16px 20px;
      border-bottom: 1.5px solid #e2e8f0;
      font-size: 0.95rem;
    }

    .doodle-table th {
      background-color: #f8fafc;
      font-weight: 800;
      color: var(--dark-text);
      border-bottom: 2px solid var(--border-doodle);
    }

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

    .highlight-col {
      background-color: #fffbeb;
      font-weight: 700;
      color: #b45309;
    }

    /* 流程与步骤 */
    .step-card {
      position: relative;
      background: #ffffff;
      border: 2px solid var(--border-doodle);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-doodle);
    }

    .step-badge {
      display: inline-block;
      width: 36px;
      height: 36px;
      line-height: 32px;
      text-align: center;
      font-weight: 900;
      background: #00ebc7;
      border: 2px solid var(--border-doodle);
      border-radius: 50%;
      margin-bottom: 12px;
    }

    /* 用户评论 */
    .review-user {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 12px;
    }

    .review-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      border: 2px solid var(--border-doodle);
      background: #fed7aa;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      color: #9a3412;
    }

    .review-meta h4 {
      font-size: 0.95rem;
      font-weight: 700;
    }

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

    .rating-stars {
      color: #f59e0b;
      font-weight: 800;
      margin-bottom: 8px;
    }

    /* FAQ 手风琴 */
    .faq-list {
      max-width: 840px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }

    .faq-item {
      background: #ffffff;
      border: 2px solid var(--border-doodle);
      border-radius: var(--radius-md);
      box-shadow: 3px 3px 0px var(--border-doodle);
      overflow: hidden;
      transition: all 0.2s ease;
    }

    .faq-question {
      padding: 18px 22px;
      cursor: pointer;
      font-weight: 700;
      font-size: 1.02rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
      background-color: #ffffff;
    }

    .faq-question:hover {
      background-color: #f8fafc;
    }

    .faq-icon {
      font-weight: 900;
      font-size: 1.2rem;
      transition: transform 0.2s ease;
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s cubic-bezier(0, 1, 0, 1), padding 0.3s ease;
      padding: 0 22px;
      background-color: #f8fafc;
      color: #475569;
      font-size: 0.95rem;
      line-height: 1.6;
      border-top: 1px solid transparent;
    }

    .faq-item.active .faq-answer {
      max-height: 500px;
      padding: 16px 22px 20px;
      border-top-color: #e2e8f0;
      transition: max-height 0.4s ease-in-out, padding 0.3s ease;
    }

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

    /* 表单与联系模块 */
    .contact-wrapper {
      display: grid;
      grid-template-columns: 1.2fr 1fr;
      gap: 32px;
      align-items: start;
    }

    .form-group {
      margin-bottom: 16px;
    }

    .form-group label {
      display: block;
      font-weight: 700;
      font-size: 0.9rem;
      margin-bottom: 6px;
      color: var(--dark-text);
    }

    .form-control {
      width: 100%;
      padding: 12px 14px;
      border: 2px solid var(--border-doodle);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #ffffff;
      color: var(--dark-text);
      transition: border-color 0.2s ease;
    }

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

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

    .contact-info-card {
      background: #fdf2e9;
      border: 2px solid var(--border-doodle);
      border-radius: var(--radius-md);
      padding: 24px;
      box-shadow: var(--shadow-doodle);
    }

    .contact-item-row {
      margin-bottom: 14px;
      font-size: 0.95rem;
    }

    .contact-item-row strong {
      display: inline-block;
      min-width: 85px;
      color: var(--dark-text);
    }

    .qr-container {
      margin-top: 20px;
      padding: 14px;
      background: #ffffff;
      border: 2px solid var(--border-doodle);
      border-radius: var(--radius-sm);
      display: inline-block;
      text-align: center;
    }

    .qr-container img {
      width: 140px;
      height: 140px;
      display: block;
      margin: 0 auto 8px;
    }

    /* 文章与外链 */
    .article-links-grid {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-link-tag {
      background: #ffffff;
      border: 1.5px solid var(--border-doodle);
      padding: 8px 14px;
      border-radius: 6px;
      font-size: 0.9rem;
      font-weight: 600;
      box-shadow: 2px 2px 0px var(--border-doodle);
      transition: all 0.2s ease;
    }

    .article-link-tag:hover {
      background: #fee2e2;
      transform: translate(-1px, -1px);
    }

    /* 友情链接与Footer */
    .friend-links-box {
      margin-top: 30px;
      padding-top: 24px;
      border-top: 2px dashed #cbd5e1;
    }

    .friend-links-list {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 10px;
    }

    .friend-links-list a {
      font-size: 0.88rem;
      font-weight: 600;
      color: #475569;
      background: #ffffff;
      padding: 4px 10px;
      border-radius: 4px;
      border: 1px solid var(--border-doodle);
    }

    .friend-links-list a:hover {
      color: var(--primary);
      border-color: var(--primary);
    }

    .site-footer {
      background: #0f172a;
      color: #e2e8f0;
      border-top: 3px solid var(--border-doodle);
      padding: 40px 0 30px;
    }

    .footer-wrapper {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }

    .footer-info p {
      font-size: 0.9rem;
      color: #94a3b8;
    }

    /* 悬浮组件 */
    .floating-tools {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .floating-btn {
      width: 48px;
      height: 48px;
      background: #ffffff;
      border: 2px solid var(--border-doodle);
      border-radius: 50%;
      box-shadow: var(--shadow-doodle);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.1rem;
      font-weight: bold;
      cursor: pointer;
      transition: transform 0.2s ease;
    }

    .floating-btn:hover {
      transform: translate(-2px, -2px);
    }

    /* 响应式媒体查询 */
    @media (max-width: 992px) {
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-features-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
    }

    @media (max-width: 768px) {
      .hero-title {
        font-size: 1.95rem;
      }
      .section-title {
        font-size: 1.65rem;
      }
      .grid-2, .grid-3, .grid-4 {
        grid-template-columns: 1fr;
      }
      .mobile-menu-btn {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #ffffff;
        flex-direction: column;
        align-items: stretch;
        border-bottom: 2px solid var(--border-doodle);
        padding: 16px;
        box-shadow: 0 10px 15px rgba(0,0,0,0.1);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links li a {
        padding: 12px 16px;
      }
    }