.auth-container {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 1rem;
}
.auth-card {
  width: 100%;
  max-width: 400px;
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}
#app {
  display: grid;
  grid-template-columns: 250px 1fr;
  grid-template-rows: auto 1fr;
  min-height: 100vh;
}
#main-header {
  grid-column: 1 / -1;
}
#sidebar {
  background-color: var(--surface-color);
  border-left: 1px solid var(--border-color);
}
#content {
  padding: 2rem;
}
@media (max-width: 768px) {
  #app {
    grid-template-columns: 1fr;
  }
  #sidebar {
    display: none;
  }
}