@media (max-width: 768px) {
    .header {
      padding: 12px 16px;
    }
  
    .search-box {
      width: 160px;
    }
  
    .board {
      padding: 12px;
      gap: 12px;
    }
  
    .column {
      width: 260px;
    }
  
    .detail-grid {
      grid-template-columns: 1fr;
    }
  
    .detail-main {
      border-right: none;
    }
  
    .detail-side {
      border-top: 1px solid var(--border);
    }
  }