/* 多彩涂鸦风格主题变量与基础重置 */
    :root {
      --bg-main: #fcfcfd;
      --bg-card: #ffffff;
      --text-main: #0f172a;
      --text-sub: #475569;
      --primary: #6366f1;
      --primary-hover: #4f46e5;
      --accent-yellow: #fde047;
      --accent-pink: #f472b6;
      --accent-cyan: #38bdf8;
      --accent-green: #4ade80;
      --accent-orange: #fb923c;
      --border-dark: #1e293b;
      --shadow-hard: 4px 4px 0px #1e293b;
      --shadow-hard-lg: 6px 6px 0px #1e293b;
      --radius-doodle: 18px;
    }

    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      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;
    }

    body {
      overflow-x: hidden;
      background-image: 
        radial-gradient(var(--accent-cyan) 0.75px, transparent 0.75px), 
        radial-gradient(var(--accent-pink) 0.75px, var(--bg-main) 0.75px);
      background-size: 30px 30px;
      background-position: 0 0, 15px 15px;
    }

    /* 布局容器 */
    .container {
      width: 100%;
      max-width: 1240px;
      margin: 0 auto;
      padding: 0 20px;
    }

    section {
      padding: 70px 0;
      position: relative;
    }

    /* 标题与排版 */
    .section-header {
      text-align: center;
      margin-bottom: 45px;
    }

    .badge-tag {
      display: inline-block;
      background: var(--accent-yellow);
      color: var(--border-dark);
      font-weight: 700;
      font-size: 0.9rem;
      padding: 4px 14px;
      border-radius: 50px;
      border: 2px solid var(--border-dark);
      box-shadow: 2px 2px 0px var(--border-dark);
      margin-bottom: 12px;
      text-transform: uppercase;
      transform: rotate(-1deg);
    }

    .section-title {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--text-main);
      letter-spacing: -0.5px;
      position: relative;
      display: inline-block;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-sub);
      max-width: 680px;
      margin: 10px auto 0 auto;
    }

    /* 按钮样式 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 12px 26px;
      font-weight: 700;
      font-size: 1rem;
      text-decoration: none;
      border-radius: 12px;
      border: 2px solid var(--border-dark);
      box-shadow: var(--shadow-hard);
      transition: all 0.2s ease;
      cursor: pointer;
    }

    .btn:hover {
      transform: translate(-2px, -2px);
      box-shadow: 6px 6px 0px var(--border-dark);
    }

    .btn:active {
      transform: translate(2px, 2px);
      box-shadow: 1px 1px 0px var(--border-dark);
    }

    .btn-primary {
      background: var(--primary);
      color: #ffffff;
    }

    .btn-secondary {
      background: var(--accent-yellow);
      color: var(--border-dark);
    }

    .btn-accent {
      background: var(--accent-pink);
      color: #ffffff;
    }

    /* 顶部导航 */
    .header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(10px);
      border-bottom: 2px solid var(--border-dark);
    }

    .header-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

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

    .ai-page-logo {
      height: 42px;
      width: auto;
      object-fit: contain;
    }

    .brand-name {
      font-size: 1.3rem;
      font-weight: 900;
      color: var(--border-dark);
    }

    .nav-links {
      display: flex;
      gap: 0; /* 约束明确要求 .nav-links gap 为 0 */
      list-style: none;
      align-items: center;
    }

    .nav-links li a {
      display: inline-block;
      padding: 8px 12px;
      font-size: 0.92rem;
      font-weight: 700;
      color: var(--text-main);
      text-decoration: none;
      border-radius: 8px;
      transition: background 0.2s;
    }

    .nav-links li a:hover {
      background: var(--accent-yellow);
    }

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: 2px solid var(--border-dark);
      padding: 6px 12px;
      border-radius: 8px;
      font-weight: bold;
      cursor: pointer;
    }

    /* 首屏 HERO（按规定禁止出现图片） */
    .hero-section {
      padding: 90px 0 70px 0;
      background: linear-gradient(135deg, #fef08a 0%, #e0e7ff 50%, #fbcfe8 100%);
      border-bottom: 3px solid var(--border-dark);
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.2fr 0.8fr;
      gap: 40px;
      align-items: center;
    }

    .hero-content h1.hero-title {
      font-size: 2.3rem;
      font-weight: 900;
      line-height: 1.25;
      color: var(--border-dark);
      margin-bottom: 18px;
    }

    .hero-subtitle {
      font-size: 1.15rem;
      color: var(--text-sub);
      margin-bottom: 28px;
      font-weight: 500;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 32px;
    }

    .hero-tags-wrapper {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
    }

    .hero-tag {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      padding: 4px 10px;
      border-radius: 20px;
      font-size: 0.82rem;
      font-weight: 700;
      box-shadow: 2px 2px 0px var(--border-dark);
    }

    /* 首屏纯文字/代码/图表视觉卡片 */
    .hero-visual-box {
      background: #ffffff;
      border: 3px solid var(--border-dark);
      border-radius: var(--radius-doodle);
      box-shadow: var(--shadow-hard-lg);
      padding: 24px;
      position: relative;
    }

    .hero-card-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      border-bottom: 2px solid var(--border-dark);
      padding-bottom: 12px;
      margin-bottom: 16px;
    }

    .dot-group {
      display: flex;
      gap: 6px;
    }

    .dot {
      width: 12px;
      height: 12px;
      border-radius: 50%;
      border: 1.5px solid var(--border-dark);
    }

    .dot-red { background: #ff5f56; }
    .dot-yellow { background: #ffbd2e; }
    .dot-green { background: #27c93f; }

    .hero-card-title {
      font-size: 0.85rem;
      font-weight: 800;
      color: var(--text-sub);
    }

    .model-badge-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
    }

    .model-pill {
      background: #f1f5f9;
      border: 1.5px solid var(--border-dark);
      border-radius: 8px;
      padding: 10px;
      text-align: center;
      font-size: 0.85rem;
      font-weight: 800;
      box-shadow: 2px 2px 0 var(--border-dark);
    }

    .model-pill.active {
      background: var(--accent-cyan);
    }

    /* 数据指标 */
    .stats-bar {
      margin-top: 40px;
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }

    .stat-item {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: 12px;
      padding: 16px;
      text-align: center;
      box-shadow: var(--shadow-hard);
    }

    .stat-num {
      font-size: 1.8rem;
      font-weight: 900;
      color: var(--primary);
    }

    .stat-lbl {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--text-sub);
    }

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

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

    .doodle-card {
      background: var(--bg-card);
      border: 2px solid var(--border-dark);
      border-radius: var(--radius-doodle);
      padding: 24px;
      box-shadow: var(--shadow-hard);
      transition: all 0.2s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .doodle-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hard-lg);
    }

    .card-icon-box {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      border: 2px solid var(--border-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
      font-size: 1.2rem;
      margin-bottom: 14px;
      box-shadow: 2px 2px 0 var(--border-dark);
    }

    .bg-pink { background: var(--accent-pink); }
    .bg-yellow { background: var(--accent-yellow); }
    .bg-cyan { background: var(--accent-cyan); }
    .bg-green { background: var(--accent-green); }
    .bg-orange { background: var(--accent-orange); }
    .bg-purple { background: #c084fc; }

    .card-title {
      font-size: 1.2rem;
      font-weight: 800;
      margin-bottom: 8px;
      color: var(--border-dark);
    }

    .card-text {
      font-size: 0.92rem;
      color: var(--text-sub);
      margin-bottom: 16px;
    }

    /* 对比表格 */
    .table-wrapper {
      overflow-x: auto;
      border: 3px solid var(--border-dark);
      border-radius: var(--radius-doodle);
      box-shadow: var(--shadow-hard-lg);
      background: #ffffff;
    }

    .custom-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }

    .custom-table th, .custom-table td {
      padding: 16px 20px;
      border-bottom: 2px solid var(--border-dark);
      border-right: 1.5px solid #e2e8f0;
      font-size: 0.95rem;
    }

    .custom-table th {
      background: #f8fafc;
      font-weight: 800;
      font-size: 1rem;
    }

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

    .highlight-col {
      background: #fefce8;
      font-weight: 700;
    }

    .rating-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #fef08a;
      border: 2px solid var(--border-dark);
      padding: 4px 12px;
      border-radius: 20px;
      font-weight: 900;
      box-shadow: 2px 2px 0 var(--border-dark);
    }

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

    .step-item {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: 16px;
      padding: 20px;
      box-shadow: var(--shadow-hard);
      position: relative;
    }

    .step-number {
      position: absolute;
      top: -14px;
      right: 14px;
      background: var(--accent-pink);
      color: #ffffff;
      font-weight: 900;
      border: 2px solid var(--border-dark);
      border-radius: 50%;
      width: 32px;
      height: 32px;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: 2px 2px 0 var(--border-dark);
    }

    /* 案例图片列表 */
    .case-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .case-card {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: 16px;
      overflow: hidden;
      box-shadow: var(--shadow-hard);
    }

    .case-img-box {
      border-bottom: 2px solid var(--border-dark);
      overflow: hidden;
    }

    .ai-page-image {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.3s ease;
    }

    .case-card:hover .ai-page-image {
      transform: scale(1.03);
    }

    .case-info {
      padding: 16px;
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .faq-item {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: 14px;
      box-shadow: var(--shadow-hard);
      overflow: hidden;
    }

    .faq-question {
      padding: 18px 24px;
      font-weight: 800;
      font-size: 1.05rem;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }

    .faq-answer {
      padding: 0 24px 18px 24px;
      color: var(--text-sub);
      font-size: 0.95rem;
      display: none;
      border-top: 1px dashed #cbd5e1;
      padding-top: 14px;
    }

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

    .faq-toggle-icon {
      font-size: 1.3rem;
      font-weight: 900;
      transition: transform 0.2s;
    }

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

    /* 用户评论 */
    .reviews-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 20px;
    }

    .review-card {
      background: #ffffff;
      border: 2px solid var(--border-dark);
      border-radius: 16px;
      padding: 20px;
      box-shadow: var(--shadow-hard);
    }

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

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      border: 2px solid var(--border-dark);
      background: var(--accent-cyan);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 900;
    }

    .user-meta h4 {
      font-size: 1rem;
      font-weight: 800;
    }

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

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

    .form-box {
      background: #ffffff;
      border: 3px solid var(--border-dark);
      border-radius: var(--radius-doodle);
      padding: 30px;
      box-shadow: var(--shadow-hard-lg);
    }

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

    .form-label {
      display: block;
      font-weight: 800;
      margin-bottom: 6px;
      font-size: 0.92rem;
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px;
      border: 2px solid var(--border-dark);
      border-radius: 10px;
      font-size: 0.95rem;
      background: #f8fafc;
      outline: none;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      background: #ffffff;
      border-color: var(--primary);
    }

    .contact-info-box {
      background: #fef08a;
      border: 3px solid var(--border-dark);
      border-radius: var(--radius-doodle);
      padding: 30px;
      box-shadow: var(--shadow-hard-lg);
    }

    .qr-container {
      display: flex;
      align-items: center;
      gap: 20px;
      margin-top: 20px;
      background: #ffffff;
      padding: 16px;
      border-radius: 12px;
      border: 2px solid var(--border-dark);
    }

    .qr-container img {
      width: 110px;
      height: 110px;
      border-radius: 8px;
      border: 1px solid #cbd5e1;
    }

    /* 页脚与友情链接 */
    .footer {
      background: #0f172a;
      color: #f8fafc;
      padding: 50px 0 30px 0;
      border-top: 4px solid var(--border-dark);
    }

    .footer-inner {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-title {
      font-size: 1.1rem;
      font-weight: 800;
      color: var(--accent-yellow);
      margin-bottom: 16px;
    }

    .footer-links-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

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

    .footer-links-list a:hover {
      color: var(--accent-cyan);
    }

    .friend-links {
      border-top: 1px solid #334155;
      padding-top: 20px;
      margin-bottom: 20px;
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
    }

    .friend-links span {
      font-weight: 800;
      color: var(--accent-yellow);
      font-size: 0.9rem;
    }

    .friend-links a {
      color: #94a3b8;
      text-decoration: none;
      font-size: 0.88rem;
    }

    .friend-links a:hover {
      color: #ffffff;
    }

    .copyright {
      text-align: center;
      font-size: 0.85rem;
      color: #64748b;
      border-top: 1px solid #1e293b;
      padding-top: 20px;
    }

    /* 浮动客服 */
    .float-kefu {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      background: var(--accent-yellow);
      border: 2px solid var(--border-dark);
      padding: 12px 18px;
      border-radius: 50px;
      box-shadow: var(--shadow-hard);
      font-weight: 900;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 8px;
      text-decoration: none;
      color: var(--border-dark);
    }

    .float-kefu:hover {
      transform: translateY(-3px);
    }

    /* 响应式调整 */
    @media (max-width: 992px) {
      .hero-grid, .contact-wrapper, .footer-inner {
        grid-template-columns: 1fr;
      }
      .card-grid-3, .reviews-grid, .case-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .card-grid-4, .step-list, .stats-bar {
        grid-template-columns: repeat(2, 1fr);
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 76px;
        left: 0;
        width: 100%;
        background: #ffffff;
        flex-direction: column;
        padding: 20px;
        border-bottom: 2px solid var(--border-dark);
        box-shadow: var(--shadow-hard);
      }
      .nav-links.active {
        display: flex;
      }
      .mobile-menu-btn {
        display: block;
      }
    }

    @media (max-width: 640px) {
      .card-grid-3, .card-grid-4, .reviews-grid, .case-grid, .step-list, .stats-bar {
        grid-template-columns: 1fr;
      }
      .hero-content h1.hero-title {
        font-size: 1.8rem;
      }
      .section-title {
        font-size: 1.7rem;
      }
    }