/* roulang page: index */
/* ===== CSS 设计变量 & 基础全局样式 ===== */
    :root {
      --primary-green: #00E676;
      --dark-bg: #0A1A0F;
      --accent-orange: #FF6D00;
      --highlight-purple: #7C4DFF;
      --gray-light: #F5F7FA;
      --gray-mid: #E9EDF2;
      --text-dark: #1E293B;
      --text-soft: #64748B;
      --border-light: rgba(0, 230, 118, 0.18);
      --glass-bg: rgba(10, 26, 15, 0.75);
      
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-card: 0 4px 20px rgba(10, 26, 15, 0.08);
      --shadow-glow: 0 8px 32px rgba(0, 230, 118, 0.2);
      
      --max-content-width: 1280px;
    }
    
    * {
      box-sizing: border-box;
    }
    
    body {
      margin: 0;
      font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
      background-color: #ffffff;
      color: var(--text-dark);
      line-height: 1.7;
      -webkit-font-smoothing: antialiased;
    }
    
    /* 数字/数据专用字体 */
    .font-mono-numbers {
      font-family: "DIN Alternate", "Roboto Mono", monospace;
      letter-spacing: 0.02em;
    }
    
    .container-main {
      max-width: var(--max-content-width);
      margin: 0 auto;
      padding: 0 24px;
    }
    
    /* 导航固定半透明玻璃效果 */
    .nav-glass {
      background: rgba(10, 26, 15, 0.88);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border-bottom: 1px solid var(--border-light);
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 50;
    }
    
    /* 发光按钮悬停 */
    .btn-primary-glow {
      background-color: var(--primary-green);
      color: #0A1A0F;
      font-weight: 600;
      border-radius: var(--radius-sm);
      transition: all 0.25s ease;
      box-shadow: 0 4px 12px rgba(0, 230, 118, 0.3);
    }
    .btn-primary-glow:hover {
      box-shadow: 0 0 28px rgba(0, 230, 118, 0.7);
      transform: translateY(-1px);
    }
    
    .btn-outline-white {
      border: 1.5px solid rgba(255,255,255,0.6);
      color: white;
      background: transparent;
      border-radius: var(--radius-sm);
      font-weight: 500;
      transition: 0.25s;
    }
    .btn-outline-white:hover {
      background: rgba(0, 230, 118, 0.15);
      border-color: var(--primary-green);
      color: var(--primary-green);
    }
    
    .cta-orange-btn {
      background: var(--accent-orange);
      color: white;
      font-weight: 700;
      border-radius: var(--radius-sm);
      transition: 0.2s;
      box-shadow: 0 0 20px rgba(255, 109, 0, 0.4);
    }
    .cta-orange-btn:hover {
      background: #e55d00;
      box-shadow: 0 0 32px rgba(255, 109, 0, 0.7);
      transform: scale(1.02);
    }
    
    /* 毛玻璃卡片 (仅Hero与数据带) */
    .glass-card {
      background: var(--glass-bg);
      backdrop-filter: blur(20px);
      -webkit-backdrop-filter: blur(20px);
      border: 1px solid rgba(0, 230, 118, 0.25);
      border-radius: var(--radius-md);
    }
    
    /* 横向滚动容器自定义滚动条 */
    .scroll-x-custom::-webkit-scrollbar {
      height: 6px;
    }
    .scroll-x-custom::-webkit-scrollbar-track {
      background: #E9EDF2;
      border-radius: 8px;
    }
    .scroll-x-custom::-webkit-scrollbar-thumb {
      background: var(--primary-green);
      border-radius: 8px;
    }
    
    /* FAQ 折叠过渡 */
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease, padding 0.2s;
    }
    .faq-item.active .faq-content {
      max-height: 220px;
      padding-top: 12px;
      padding-bottom: 8px;
    }
    .faq-arrow {
      transition: transform 0.3s;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
    }
    
    @media (max-width: 768px) {
      .hide-mobile-nav {
        display: none !important;
      }
      .mobile-bottom-nav {
        display: flex;
      }
      .faq-grid {
        grid-template-columns: 1fr;
      }
    }
    @media (min-width: 769px) {
      .mobile-bottom-nav {
        display: none;
      }
     }