/* roulang page: index */
/* 自定义设计变量与视觉系统 */
    :root {
      --primary-orange: #FF7A00;
      --primary-dark: #E56E00;
      --deep-blue: #2C3E50;
      --success-green: #00B578;
      --warning-orange: #FF9F0A;
      --error-red: #FA5151;
      --bg-light: #F5F6FA;
      --bg-white: #FFFFFF;
      --bg-gray-block: #EBEEF5;
      --text-primary: #1F2329;
      --text-secondary: #475669;
      --text-aux: #86909C;
      --border-light: #E5E8EF;
      --shadow-card: 0 2px 12px rgba(0,0,0,0.04);
      --shadow-hover: 0 8px 24px rgba(0,0,0,0.08);
      --radius-card: 12px;
      --radius-btn: 8px;
      --radius-full: 24px;
      --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
      --transition-smooth: all 0.2s ease;
    }
    
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    body {
      font-family: var(--font-sans);
      background-color: var(--bg-light);
      color: var(--text-secondary);
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .container {
      max-width: 1200px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 导航玻璃效果 */
    .glass-nav {
      background: rgba(255,255,255,0.85);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-light);
      height: 64px;
    }

    .nav-link {
      color: var(--text-secondary);
      font-size: 16px;
      font-weight: 500;
      transition: var(--transition-smooth);
      position: relative;
      padding-bottom: 4px;
    }
    .nav-link:hover {
      color: var(--primary-orange);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--primary-orange);
      transition: width 0.2s ease;
    }
    .nav-link:hover::after {
      width: 100%;
    }

    /* 主按钮 */
    .btn-primary {
      background-color: var(--primary-orange);
      color: white;
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      box-shadow: 0 4px 10px rgba(255,122,0,0.3);
      transition: var(--transition-smooth);
      display: inline-block;
      text-align: center;
    }
    .btn-primary:hover {
      background-color: var(--primary-dark);
      box-shadow: 0 8px 18px rgba(255,122,0,0.4);
      transform: translateY(-1px);
    }
    .btn-primary:focus-visible {
      outline: 3px solid rgba(255,122,0,0.4);
      outline-offset: 2px;
    }

    .btn-secondary {
      background: white;
      color: var(--primary-orange);
      border: 1px solid var(--primary-orange);
      font-weight: 600;
      padding: 0.75rem 2rem;
      border-radius: var(--radius-btn);
      transition: var(--transition-smooth);
      display: inline-block;
      text-align: center;
    }
    .btn-secondary:hover {
      background: #FFF3E6;
      border-color: var(--primary-dark);
      color: var(--primary-dark);
    }

    /* 卡片悬浮 */
    .card-hover {
      background: var(--bg-white);
      border-radius: var(--radius-card);
      box-shadow: var(--shadow-card);
      transition: transform 0.25s ease, box-shadow 0.25s ease;
    }
    .card-hover:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
    }

    /* 板块间距 */
    .section-space {
      padding-top: 80px;
      padding-bottom: 80px;
    }

    @media (max-width: 768px) {
      .section-space {
        padding-top: 60px;
        padding-bottom: 60px;
      }
    }

    /* 移动端底部导航 */
    .mobile-bottom-nav {
      background: white;
      border-top: 1px solid var(--border-light);
      backdrop-filter: blur(10px);
    }
    .mobile-nav-item {
      color: var(--text-aux);
      font-size: 12px;
      transition: color 0.2s;
    }
    .mobile-nav-item.active {
      color: var(--primary-orange);
    }