:root {
      --primary: #e6005c;
      --primary-hover: #c4004e;
      --primary-light: #fff0f5;
      --accent: #ff2a7a;
      --accent-soft: #ffe4ee;
      --text-main: #1f2429;
      --text-muted: #5e6973;
      --bg-page: #faf8f9;
      --bg-surface: #ffffff;
      --border-color: #f2dbe4;
      --card-shadow: 0 10px 30px rgba(230, 0, 92, 0.06);
      --card-shadow-hover: 0 16px 36px rgba(230, 0, 92, 0.12);
      --container-max: 1200px;
      --radius-sm: 8px;
      --radius-md: 14px;
      --radius-lg: 20px;
    }

    * {
      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, "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;
    }

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

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

    /* 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);
      transition: box-shadow 0.3s ease;
    }

    .nav-inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }

    .brand-wrap {
      display: flex;
      align-items: center;
      gap: 12px;
    }

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

    .brand-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }

    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
    }

    .nav-links a {
      font-size: 0.95rem;
      font-weight: 500;
      color: #333d47;
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      transition: all 0.2s ease;
    }

    .nav-links a:hover {
      color: var(--primary);
      background-color: var(--primary-light);
    }

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 22px;
      border-radius: 99px;
      font-weight: 600;
      font-size: 0.92rem;
      cursor: pointer;
      border: 1px solid transparent;
      transition: all 0.25s cubic-bezier(0.2, 0.8, 0.2, 1);
      text-align: center;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--accent) 0%, var(--primary) 100%);
      color: #ffffff !important;
      box-shadow: 0 4px 14px rgba(230, 0, 92, 0.3);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 18px rgba(230, 0, 92, 0.42);
    }

    .btn-outline {
      border-color: var(--primary);
      color: var(--primary);
      background: transparent;
    }

    .btn-outline:hover {
      background: var(--primary-light);
      transform: translateY(-2px);
    }

    .menu-toggle {
      display: none;
      background: transparent;
      border: none;
      font-size: 1.5rem;
      color: var(--text-main);
      cursor: pointer;
      padding: 4px 8px;
    }

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

    .section-head {
      text-align: center;
      max-width: 760px;
      margin: 0 auto 46px;
    }

    .section-badge {
      display: inline-block;
      padding: 5px 14px;
      background: var(--primary-light);
      color: var(--primary);
      border-radius: 99px;
      font-size: 0.82rem;
      font-weight: 700;
      margin-bottom: 12px;
      letter-spacing: 1px;
    }

    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: #1a1a1a;
      line-height: 1.3;
      margin-bottom: 14px;
    }

    .section-desc {
      font-size: 1.02rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 首屏 Hero (严禁图片) */
    .hero-section {
      background: radial-gradient(circle at 80% 20%, #ffe4ee 0%, rgba(255, 240, 245, 0.5) 50%, #ffffff 100%);
      padding: 75px 0 65px;
      border-bottom: 1px solid #fce3ec;
    }

    .hero-content {
      text-align: center;
      max-width: 900px;
      margin: 0 auto;
    }

    .hero-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: #ffffff;
      border: 1px solid #ffccd9;
      border-radius: 99px;
      font-size: 0.88rem;
      color: var(--primary);
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(230, 0, 92, 0.08);
      margin-bottom: 22px;
    }

    .hero-title {
      font-size: 2.8rem;
      font-weight: 900;
      line-height: 1.25;
      color: #18181b;
      margin-bottom: 20px;
      letter-spacing: -1px;
    }

    .hero-title .highlight {
      color: var(--primary);
      position: relative;
      display: inline-block;
    }

    .hero-sub {
      font-size: 1.15rem;
      color: var(--text-muted);
      max-width: 760px;
      margin: 0 auto 34px;
      line-height: 1.7;
    }

    .hero-cta {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .hero-cta .btn {
      padding: 14px 34px;
      font-size: 1.05rem;
    }

    .hero-stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 36px;
    }

    .stat-card {
      background: #ffffff;
      padding: 22px 16px;
      border-radius: var(--radius-md);
      border: 1px solid #f7d5e1;
      box-shadow: var(--card-shadow);
      transition: transform 0.25s ease;
    }

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

    .stat-num {
      font-size: 1.85rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.1;
      margin-bottom: 6px;
    }

    .stat-label {
      font-size: 0.86rem;
      color: var(--text-muted);
      font-weight: 500;
    }

    /* 平台介绍与架构 */
    .intro-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }

    .intro-card {
      background: var(--bg-surface);
      border-radius: var(--radius-md);
      padding: 30px;
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
    }

    .intro-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--card-shadow-hover);
      border-color: #f7a8c4;
    }

    .intro-icon {
      width: 48px;
      height: 48px;
      border-radius: 12px;
      background: var(--primary-light);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 18px;
      font-weight: 800;
    }

    .intro-card h3 {
      font-size: 1.22rem;
      color: #1a1a1a;
      margin-bottom: 10px;
    }

    .intro-card p {
      color: var(--text-muted);
      font-size: 0.94rem;
      line-height: 1.6;
    }

    /* 场景矩阵卡片 */
    .scene-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
      gap: 20px;
    }

    .scene-item {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 22px;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }

    .scene-item:hover {
      border-color: var(--primary);
      transform: translateY(-3px);
      box-shadow: var(--card-shadow-hover);
    }

    .scene-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: #212529;
      margin-bottom: 8px;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .scene-title::before {
      content: "";
      width: 6px;
      height: 16px;
      background: var(--primary);
      border-radius: 3px;
    }

    .scene-desc {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 媒体展示与案例中心 */
    .showcase-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 28px;
      align-items: center;
      margin-bottom: 40px;
    }

    .showcase-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 24px;
      box-shadow: var(--card-shadow);
    }

    .img-wrap {
      border-radius: var(--radius-md);
      overflow: hidden;
      background: #fdf5f8;
      border: 1px solid #fce3ec;
    }

    .img-wrap img {
      width: 100%;
      height: auto;
      display: block;
      transition: transform 0.4s ease;
    }

    .showcase-card:hover .img-wrap img {
      transform: scale(1.02);
    }

    .showcase-info {
      padding-top: 18px;
    }

    .showcase-info h3 {
      font-size: 1.25rem;
      color: #1f2429;
      margin-bottom: 8px;
    }

    .gallery-grid {
      display: grid;
      grid-template-columns: 2fr 1fr;
      gap: 24px;
      align-items: stretch;
    }

    /* 对比评测表格 */
    .compare-container {
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      overflow: hidden;
    }

    .score-banner {
      background: linear-gradient(135deg, #fff2f6 0%, #ffe0ec 100%);
      padding: 24px 30px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      border-bottom: 1px solid #fbd0e0;
    }

    .score-left h3 {
      font-size: 1.35rem;
      color: var(--primary);
      margin-bottom: 4px;
    }

    .score-meta {
      display: flex;
      align-items: center;
      gap: 18px;
    }

    .score-val {
      font-size: 2.2rem;
      font-weight: 900;
      color: var(--primary);
    }

    .score-stars {
      color: #ff9900;
      font-size: 1.3rem;
    }

    .table-responsive {
      width: 100%;
      overflow-x: auto;
    }

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

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      font-size: 0.94rem;
      border-bottom: 1px solid #f6e2ea;
    }

    .compare-table th {
      background: #fffafa;
      color: #333d47;
      font-weight: 700;
    }

    .compare-table tr:hover {
      background-color: #fff8fa;
    }

    .cell-highlight {
      color: var(--primary);
      font-weight: 700;
      background-color: rgba(230, 0, 92, 0.02);
    }

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

    .step-card {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 26px 20px;
      position: relative;
    }

    .step-badge {
      width: 34px;
      height: 34px;
      background: var(--primary);
      color: #ffffff;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 0.9rem;
      margin-bottom: 14px;
    }

    .step-card h3 {
      font-size: 1.15rem;
      margin-bottom: 8px;
    }

    /* 用户评论 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 22px;
    }

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

    .testimonial-quote {
      font-size: 0.93rem;
      color: #495057;
      line-height: 1.6;
      margin-bottom: 18px;
    }

    .user-profile {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px dashed #f2dbe4;
      padding-top: 14px;
    }

    .user-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: linear-gradient(135deg, #ff7597, var(--primary));
      color: #ffffff;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 1.05rem;
    }

    .user-name {
      font-weight: 700;
      font-size: 0.95rem;
      color: #1a1a1a;
    }

    .user-role {
      font-size: 0.82rem;
      color: var(--text-muted);
    }

    /* 文章专区 */
    .articles-section {
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 30px;
      margin-bottom: 40px;
    }

    .article-links {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      margin-top: 16px;
    }

    .article-pill {
      background: var(--primary-light);
      color: var(--primary);
      padding: 8px 16px;
      border-radius: 99px;
      font-size: 0.88rem;
      font-weight: 600;
      border: 1px solid #ffd2e0;
      transition: all 0.2s ease;
    }

    .article-pill:hover {
      background: var(--primary);
      color: #ffffff;
    }

    /* FAQ 折叠项 */
    .faq-container {
      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 0.25s ease;
    }

    .faq-item:hover {
      border-color: #f7a8c4;
    }

    .faq-question {
      padding: 18px 22px;
      font-size: 1.02rem;
      font-weight: 700;
      color: #212529;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      background: #ffffff;
      user-select: none;
    }

    .faq-toggle-icon {
      font-size: 1.2rem;
      color: var(--primary);
      transition: transform 0.25s ease;
    }

    .faq-answer {
      display: none;
      padding: 0 22px 18px;
      color: var(--text-muted);
      font-size: 0.94rem;
      line-height: 1.65;
      border-top: 1px solid #fdf0f4;
    }

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

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

    /* 联系与表单 */
    .contact-layout {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
      background: #ffffff;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--card-shadow);
      padding: 36px;
    }

    .contact-meta h3 {
      font-size: 1.45rem;
      margin-bottom: 12px;
      color: #1a1a1a;
    }

    .meta-list {
      margin: 20px 0;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .meta-row {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 0.94rem;
      color: #3f4750;
    }

    .qr-box {
      margin-top: 24px;
      display: inline-block;
      text-align: center;
      padding: 16px;
      background: #fffafa;
      border: 1px solid #fcdde7;
      border-radius: var(--radius-md);
    }

    .qr-box img {
      width: 140px;
      height: 140px;
      display: block;
      border-radius: 6px;
      margin: 0 auto 8px;
      object-fit: cover;
    }

    .qr-box span {
      font-size: 0.84rem;
      color: var(--primary);
      font-weight: 600;
    }

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

    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      margin-bottom: 6px;
      color: #2c3238;
    }

    .form-input, .form-select, .form-textarea {
      width: 100%;
      padding: 12px 14px;
      border-radius: var(--radius-sm);
      border: 1px solid #e2cad4;
      font-size: 0.94rem;
      background: #ffffff;
      outline: none;
      transition: border-color 0.2s ease;
      font-family: inherit;
    }

    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
      box-shadow: 0 0 0 3px rgba(230, 0, 92, 0.1);
    }

    .form-textarea {
      resize: vertical;
      min-height: 100px;
    }

    /* 友情链接与底部 */
    .friendly-links {
      padding: 24px;
      background: #ffffff;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      margin-bottom: 30px;
    }

    .friendly-head {
      font-size: 0.95rem;
      font-weight: 700;
      color: #212529;
      margin-bottom: 12px;
    }

    .friendly-list {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
    }

    .friendly-list a {
      color: var(--text-muted);
      font-size: 0.9rem;
      transition: color 0.2s ease;
    }

    .friendly-list a:hover {
      color: var(--primary);
    }

    .site-footer {
      background: #ffffff;
      border-top: 1px solid var(--border-color);
      padding: 34px 0 28px;
      color: #4f5963;
      font-size: 0.88rem;
    }

    .footer-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
    }

    .footer-left {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .footer-links a {
      color: #4f5963;
      margin-right: 14px;
    }

    .footer-links a:hover {
      color: var(--primary);
    }

    /* 悬浮工具栏 */
    .floating-widget {
      position: fixed;
      right: 20px;
      bottom: 30px;
      display: flex;
      flex-direction: column;
      gap: 10px;
      z-index: 999;
    }

    .float-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 14px rgba(230, 0, 92, 0.35);
      cursor: pointer;
      font-size: 1.15rem;
      border: none;
      transition: transform 0.25s ease;
    }

    .float-btn:hover {
      transform: scale(1.08);
      background: var(--primary-hover);
    }

    /* 响应式断点 */
    @media (max-width: 992px) {
      .hero-title {
        font-size: 2.15rem;
      }
      .intro-grid, .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .step-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .showcase-row, .gallery-grid, .contact-layout {
        grid-template-columns: 1fr;
      }
      .hero-stats {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        flex-direction: column;
        position: absolute;
        top: 74px;
        left: 0;
        width: 100%;
        background: #ffffff;
        padding: 16px 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
      }
      .nav-links.active {
        display: flex;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .hero-title {
        font-size: 1.85rem;
      }
      .intro-grid, .testimonial-grid, .step-grid {
        grid-template-columns: 1fr;
      }
      .score-banner {
        flex-direction: column;
        align-items: flex-start;
      }
      .footer-inner {
        flex-direction: column;
        align-items: flex-start;
      }
    }