* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen',
    'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
    sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.App {
  min-height: 100vh;
}

/* Mobile-first responsive breakpoints */
@media (max-width: 768px) {
  .admin-dashboard .sidebar {
    position: fixed;
    left: -260px;
    z-index: 1000;
    transition: left 0.3s ease;
  }
  
  .admin-dashboard .sidebar.open {
    left: 0;
  }
}