:root {
  --primary: #2563eb;
  --sidebar-bg: #0f172a;
  --sidebar-width: 260px;
}

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #f0f2f5;
  margin: 0;
  padding: 0;
}

.sidebar {
  position: fixed;
  left: 0;
  top: 0;
  z-index: 1000;
}

.sidebar .nav-link {
  color: #94a3b8;
  padding: 0.7rem 1rem;
  border-radius: 0.5rem;
  transition: all 0.2s;
}

.sidebar .nav-link:hover, .sidebar .nav-link.active {
  background-color: rgba(37, 99, 235, 0.2);
  color: #fff;
}

.sidebar .nav-link.active {
  background-color: var(--primary);
}

main {
  margin-left: var(--sidebar-width);
}

.card {
  border-radius: 0.75rem;
}

.card-header {
  font-weight: 600;
}

.table th {
  font-weight: 600;
  color: #475569;
}

.badge {
  font-size: 0.8rem;
  padding: 0.35em 0.65em;
}

.btn-primary {
  background-color: var(--primary);
  border-color: var(--primary);
}

.btn-primary:hover {
  background-color: #1d4ed8;
}

/* Mobile toggle (hamburger) */
.mobile-toggle {
  display: none;
}

@media (max-width: 768px) {
  .sidebar {
    transform: translateX(-100%);
    transition: transform 0.3s ease;
  }
  .sidebar.open {
    transform: translateX(0);
  }
  main {
    margin-left: 0;
  }
  .mobile-toggle {
    display: block;
    position: fixed;
    top: 1rem;
    left: 1rem;
    z-index: 1100;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 0.5rem;
    padding: 0.5rem 0.75rem;
    cursor: pointer;
  }
}