*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --sidebar-w: 220px;
  --sidebar-bg: #1e2a38;
  --sidebar-hover: #2a3a4e;
  --sidebar-active: #3a4f6a;
  --accent: #4a90d9;
  --bg: #f0f2f5;
  --card: #fff;
  --text: #1a1a2e;
  --text-muted: #6b7280;
  --border: #e5e7eb;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

/* Login */
.login-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #1e2a38 0%, #2a3a4e 100%);
}

.login-card {
  background: var(--card);
  border-radius: 12px;
  padding: 2.5rem;
  width: 100%;
  max-width: 400px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}

.login-card h1 {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.login-card p {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

/* Forms */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 0.25rem;
  color: var(--text-muted);
}

.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  font-size: 0.9rem;
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus, .form-group select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(74,144,217,0.1);
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.6rem 1.2rem;
  border: none;
  border-radius: 6px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover { background: #3a7bc8; }

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

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

.btn-secondary:hover { background: #d1d5db; }

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.btn-sm { padding: 0.35rem 0.75rem; font-size: 0.8rem; }

.error-msg {
  color: var(--danger);
  font-size: 0.85rem;
  margin-top: 0.5rem;
}

/* Layout */
.app-layout {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-w);
  background: var(--sidebar-bg);
  color: #cbd5e1;
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 10;
}

.sidebar-header {
  padding: 1.25rem;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.sidebar-header h2 {
  font-size: 1.1rem;
  color: #fff;
  font-weight: 600;
}

.sidebar-header small {
  font-size: 0.75rem;
  color: #64748b;
}

.sidebar nav {
  flex: 1;
  padding: 0.5rem 0;
  overflow-y: auto;
}

.sidebar nav a {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.65rem 1.25rem;
  color: #94a3b8;
  text-decoration: none;
  font-size: 0.9rem;
  transition: background 0.15s, color 0.15s;
}

.sidebar nav a:hover {
  background: var(--sidebar-hover);
  color: #e2e8f0;
}

.sidebar nav a.active {
  background: var(--sidebar-active);
  color: #fff;
  font-weight: 500;
}

.sidebar-footer {
  padding: 1rem 1.25rem;
  border-top: 1px solid rgba(255,255,255,0.08);
}

.sidebar-footer button {
  background: none;
  border: none;
  color: #64748b;
  cursor: pointer;
  font-size: 0.85rem;
  padding: 0.4rem 0;
}

.sidebar-footer button:hover { color: #e2e8f0; }

/* Content */
.content {
  flex: 1;
  margin-left: var(--sidebar-w);
  padding: 1.5rem 2rem;
}

.content-header {
  margin-bottom: 1.5rem;
}

.content-header h1 {
  font-size: 1.5rem;
  font-weight: 600;
}

/* Cards */
.card {
  background: var(--card);
  border-radius: 8px;
  border: 1px solid var(--border);
  padding: 1.25rem;
  margin-bottom: 1rem;
}

.card h3 {
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: var(--text);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

thead th {
  text-align: left;
  padding: 0.6rem 0.75rem;
  background: #f8f9fa;
  border-bottom: 2px solid var(--border);
  font-weight: 600;
  font-size: 0.8rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

tbody td {
  padding: 0.6rem 0.75rem;
  border-bottom: 1px solid var(--border);
}

tbody tr:hover { background: #f8f9fa; }

.text-right { text-align: right; }
.text-center { text-align: center; }

/* Status badges */
.badge {
  display: inline-block;
  padding: 0.15rem 0.5rem;
  border-radius: 9999px;
  font-size: 0.75rem;
  font-weight: 500;
}

.badge-green { background: #dcfce7; color: #166534; }
.badge-amber { background: #fef3c7; color: #92400e; }
.badge-red { background: #fee2e2; color: #991b1b; }
.badge-blue { background: #dbeafe; color: #1e40af; }
.badge-gray { background: #f3f4f6; color: #374151; }

/* Loading */
.loading-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  color: var(--text-muted);
  font-size: 1.1rem;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  display: inline-block;
  margin-right: 0.5rem;
}

@keyframes spin { to { transform: rotate(360deg); } }

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal {
  background: var(--card);
  border-radius: 12px;
  padding: 1.5rem;
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}

.modal h2 {
  font-size: 1.2rem;
  margin-bottom: 1rem;
}

.modal-actions {
  display: flex;
  gap: 0.5rem;
  justify-content: flex-end;
  margin-top: 1.25rem;
}

/* Grid */
.grid { display: grid; gap: 1rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Utility */
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }

/* Responsive */
@media (max-width: 768px) {
  .sidebar { width: 60px; }
  .sidebar-header h2, .sidebar nav a span, .sidebar-footer span { display: none; }
  .content { margin-left: 60px; padding: 1rem; }
  .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
}