body { min-height: 100vh; background: #f8f9fa; }
.sidebar { width: 260px; min-height: 100vh; }
.sidebar .nav-link { color: #adb5bd; border-radius: .5rem; }
.sidebar .nav-link:hover, .sidebar .nav-link.active { color: #fff; background: rgba(255,255,255,.12); }
.main-content { min-height: 100vh; }
.login-page { min-height: 100vh; background: #f8f9fa; }
.login-card { width: 100%; max-width: 420px; }
@media (max-width: 991.98px) { .sidebar { width: 100%; min-height: auto; } }


.loader-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, .55);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
}
.loader-hourglass {
  font-size: 4rem;
  display: inline-block;
  animation: loader-hourglass-spin 1s linear infinite;
}
@keyframes loader-hourglass-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}