/* 全局变量配置：桃红艳丽风 + 浅色干净基底 */
    :root {
      --primary-color: #E91E63;
      --primary-hover: #D81B60;
      --primary-dark: #880E4F;
      --primary-light: #FCE4EC;
      --accent-color: #FF2A6D;
      --bg-main: #FAFAFC;
      --bg-card: #FFFFFF;
      --bg-alt: #FFF5F8;
      --text-main: #2D1B2D;
      --text-muted: #665261;
      --border-color: #F8BBD0;
      --border-light: #FCE4EC;
      --shadow-sm: 0 4px 12px rgba(233, 30, 99, 0.06);
      --shadow-md: 0 8px 24px rgba(233, 30, 99, 0.12);
      --shadow-lg: 0 16px 36px rgba(233, 30, 99, 0.18);
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --container-width: 1200px;
      --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    }

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

    html {
      scroll-behavior: smooth;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
      background-color: var(--bg-main);
      color: var(--text-main);
      line-height: 1.6;
    }

    body {
      overflow-x: hidden;
    }

    a {
      color: var(--primary-color);
      text-decoration: none;
      transition: var(--transition);
    }

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

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

    /* 容器布局规范 */
    .container {
      width: 100%;
      max-width: var(--container-width);
      margin: 0 auto;
      padding: 0 20px;
    }

    /* 导航栏样式 */
    .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-light);
      box-shadow: var(--shadow-sm);
    }

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

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

    .ai-page-logo {
      max-height: 48px;
      width: auto;
    }

    .nav-wrapper {
      display: flex;
      align-items: center;
    }

    /* 规则要求: .nav-links 的 gap 属性设置为 0 */
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 0;
    }

    .nav-links a {
      display: inline-block;
      padding: 8px 14px;
      font-size: 15px;
      font-weight: 500;
      color: var(--text-main);
      border-radius: var(--radius-sm);
    }

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

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

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      padding: 10px 24px;
      font-size: 15px;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: none;
      transition: var(--transition);
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(233, 30, 99, 0.35);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(233, 30, 99, 0.5);
      color: #FFFFFF;
    }

    .btn-secondary {
      background-color: var(--primary-light);
      color: var(--primary-color);
      border: 1px solid var(--border-color);
    }

    .btn-secondary:hover {
      background-color: var(--primary-color);
      color: #FFFFFF;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      color: var(--text-main);
      cursor: pointer;
    }

    /* 首屏 HERO 区域（严禁任何图片） */
    .hero-section {
      padding: 90px 0 70px;
      background: radial-gradient(circle at 80% 20%, #FFE6EF 0%, #FAFAFC 60%);
      text-align: center;
      position: relative;
      overflow: hidden;
    }

    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      padding: 6px 18px;
      background: var(--primary-light);
      border: 1px solid var(--border-color);
      border-radius: 30px;
      font-size: 14px;
      color: var(--primary-color);
      font-weight: 600;
      margin-bottom: 24px;
    }

    .hero-title-h1 {
      font-size: 38px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 20px;
      letter-spacing: -0.5px;
    }

    .hero-title-h1 span {
      background: linear-gradient(135deg, var(--primary-color), #D81B60);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-subtitle {
      font-size: 18px;
      color: var(--text-muted);
      max-width: 800px;
      margin: 0 auto 36px;
      line-height: 1.7;
    }

    .hero-cta-group {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 16px;
      margin-bottom: 50px;
      flex-wrap: wrap;
    }

    .hero-metrics {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
      margin-top: 40px;
    }

    .metric-card {
      background: var(--bg-card);
      padding: 24px 16px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--border-color);
    }

    .metric-number {
      font-size: 32px;
      font-weight: 800;
      color: var(--primary-color);
      margin-bottom: 4px;
    }

    .metric-label {
      font-size: 14px;
      color: var(--text-muted);
    }

    /* 区块通用结构 */
    .section {
      padding: 80px 0;
    }

    .section-alt {
      background-color: var(--bg-alt);
    }

    .section-header {
      text-align: center;
      max-width: 750px;
      margin: 0 auto 50px;
    }

    .section-tag {
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1px;
      color: var(--primary-color);
      margin-bottom: 8px;
      display: block;
    }

    .section-title {
      font-size: 30px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }

    .section-desc {
      font-size: 16px;
      color: var(--text-muted);
    }

    /* 网格与卡片组件 */
    .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: 30px;
    }

    .card {
      background-color: var(--bg-card);
      border-radius: var(--radius-md);
      padding: 30px;
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }

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

    .card-icon {
      width: 54px;
      height: 54px;
      border-radius: var(--radius-sm);
      background: var(--primary-light);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 24px;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .card-title {
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--text-main);
    }

    .card-text {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 场景与模型云标签 */
    .scenarios-grid {
      display: grid;
      grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
      gap: 16px;
    }

    .scenario-item {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      padding: 18px;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: flex-start;
      gap: 14px;
      transition: var(--transition);
    }

    .scenario-item:hover {
      border-color: var(--primary-color);
      background: var(--primary-light);
    }

    .scenario-icon {
      font-size: 22px;
      color: var(--primary-color);
      line-height: 1;
    }

    .scenario-info h4 {
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 4px;
      color: var(--text-main);
    }

    .scenario-info p {
      font-size: 13px;
      color: var(--text-muted);
    }

    .model-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      justify-content: center;
      margin-top: 30px;
    }

    .model-tag {
      padding: 8px 16px;
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: 20px;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      box-shadow: var(--shadow-sm);
    }

    .model-tag.highlight {
      background: var(--primary-color);
      color: #FFFFFF;
      border-color: var(--primary-color);
    }

    /* 对比表格组件 */
    .compare-box {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
      padding: 30px;
      margin-top: 30px;
    }

    .rating-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      background: linear-gradient(135deg, #FFF0F5, #FCE4EC);
      padding: 20px 30px;
      border-radius: var(--radius-md);
      margin-bottom: 30px;
      border-left: 5px solid var(--primary-color);
    }

    .rating-score {
      display: flex;
      align-items: center;
      gap: 15px;
    }

    .score-num {
      font-size: 42px;
      font-weight: 900;
      color: var(--primary-color);
    }

    .stars {
      color: #FFB800;
      font-size: 20px;
    }

    .compare-table-wrapper {
      overflow-x: auto;
    }

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

    .compare-table th, .compare-table td {
      padding: 16px 20px;
      border-bottom: 1px solid var(--border-light);
      font-size: 15px;
    }

    .compare-table th {
      background: var(--bg-alt);
      font-weight: 700;
      color: var(--text-main);
    }

    .compare-table .highlight-cell {
      background: rgba(233, 30, 99, 0.04);
      font-weight: 700;
      color: var(--primary-color);
    }

    /* FAQ 折叠面板 */
    .faq-list {
      max-width: 900px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      margin-bottom: 14px;
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .faq-question {
      padding: 20px 24px;
      font-size: 17px;
      font-weight: 700;
      color: var(--text-main);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-question::after {
      content: '+';
      font-size: 22px;
      color: var(--primary-color);
      transition: var(--transition);
    }

    .faq-item.active .faq-question::after {
      content: '-';
    }

    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease-out;
      background: var(--bg-alt);
    }

    .faq-answer p {
      padding: 20px 24px;
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 客户评论卡片 */
    .testimonial-card {
      background: var(--bg-card);
      padding: 28px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-light);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .testimonial-text {
      font-size: 15px;
      color: var(--text-muted);
      margin-bottom: 20px;
      font-style: italic;
    }

    .testimonial-user {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .avatar-placeholder {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--primary-light);
      color: var(--primary-color);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
    }

    .user-info h5 {
      font-size: 15px;
      font-weight: 700;
      color: var(--text-main);
    }

    .user-info p {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 表单组件 */
    .form-container {
      background: var(--bg-card);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-lg);
      padding: 40px;
      max-width: 650px;
      margin: 0 auto;
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      font-size: 15px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      background-color: var(--bg-main);
      color: var(--text-main);
      outline: none;
      transition: var(--transition);
    }

    .form-control:focus {
      border-color: var(--primary-color);
      box-shadow: 0 0 0 3px rgba(233, 30, 99, 0.15);
    }

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

    /* 页面图片展示区域 (按照指导语仅在 Hero 之后放置) */
    .image-showcase {
      margin-top: 30px;
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
      gap: 20px;
    }

    .ai-page-image {
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-sm);
      object-fit: cover;
      width: 100%;
      height: 200px;
    }

    /* 页脚设计 (强制可读深色背景配浅色字) */
    .footer {
      background-color: #1F111D;
      color: #E0CFD9;
      padding: 60px 0 30px;
      border-top: 3px solid var(--primary-color);
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 2fr 1fr 1fr 1.5fr;
      gap: 40px;
      margin-bottom: 40px;
    }

    .footer-brand h3 {
      font-size: 22px;
      color: #FFFFFF;
      margin-bottom: 14px;
    }

    .footer-brand p {
      font-size: 14px;
      line-height: 1.7;
      color: #B3A0AC;
      margin-bottom: 20px;
    }

    .footer-title {
      font-size: 16px;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 18px;
    }

    .footer-links {
      list-style: none;
    }

    .footer-links li {
      margin-bottom: 10px;
    }

    .footer-links a {
      color: #B3A0AC;
      font-size: 14px;
    }

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

    .friend-links-box a {
      display: inline-block;
      margin-right: 12px;
      margin-bottom: 8px;
      color: #B3A0AC;
      font-size: 13px;
    }

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

    .footer-bottom {
      text-align: center;
      padding-top: 30px;
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      font-size: 13px;
      color: #8C7B86;
    }

    /* 浮动客服组件 */
    .floating-contact {
      position: fixed;
      right: 20px;
      bottom: 30px;
      z-index: 999;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }

    .float-btn {
      width: 50px;
      height: 50px;
      border-radius: 50%;
      background: var(--primary-color);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-md);
      cursor: pointer;
      font-size: 20px;
      transition: var(--transition);
    }

    .float-btn:hover {
      transform: scale(1.1);
      background: var(--primary-hover);
    }

    /* 文章列表区域 */
    .articles-wrapper {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      padding: 24px;
    }

    .article-link-list {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-top: 16px;
    }

    .article-link-list li a {
      font-size: 15px;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .article-link-list li a:hover {
      color: var(--primary-color);
    }

    /* 响应式断点控制 */
    @media (max-width: 992px) {
      .hero-metrics, .grid-4 {
        grid-template-columns: repeat(2, 1fr);
      }
      .grid-3 {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .header-inner {
        height: 64px;
      }
      .nav-wrapper {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        padding: 20px;
        box-shadow: var(--shadow-md);
        border-bottom: 1px solid var(--border-light);
      }
      .nav-wrapper.active {
        display: block;
      }
      .nav-links {
        flex-direction: column;
        align-items: flex-start;
      }
      .nav-links a {
        width: 100%;
        padding: 10px 0;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-title-h1 {
        font-size: 26px;
      }
      .hero-metrics, .grid-3, .grid-2, .grid-4 {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .rating-banner {
        flex-direction: column;
        align-items: flex-start;
        gap: 15px;
      }
    }