:root {
  --sidebar-bg: #1A2A3A;
  --sidebar-hover: #243B4F;
  --sidebar-active: #2563EB;
  --sidebar-text: #8BA0B8;
  --sidebar-text-active: #FFFFFF;
  --primary: #2563EB;
  --primary-hover: #1D4ED8;
  --primary-light: #DBEAFE;
  --bg: #FFFFFF;
  --bg-secondary: #F4F6F8;
  --card-bg: #FFFFFF;
  --text: #1E293B;
  --text-secondary: #64748B;
  --text-muted: #94A3B8;
  --border: #E2E8F0;
  --success: #10B981;
  --success-light: #D1FAE5;
  --warning: #F59E0B;
  --warning-light: #FEF3C7;
  --danger: #EF4444;
  --danger-light: #FEE2E2;
  --info: #3B82F6;
  --info-light: #DBEAFE;
  --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.08), 0 4px 6px rgba(0,0,0,0.03);
  --radius: 8px;
  --radius-lg: 12px;
  --transition: 0.2s ease;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg-secondary);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* === SIDEBAR === */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: 260px;
  height: 100vh;
  background: var(--sidebar-bg);
  color: var(--sidebar-text);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition);
  overflow-y: auto;
}

.sidebar-brand {
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.sidebar-brand .brand-icon {
  width: 36px;
  height: 36px;
  background: var(--primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  color: #fff;
}

.sidebar-brand .brand-text {
  font-size: 1.2rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
}

.sidebar-brand .brand-text span { color: var(--primary); }

.sidebar-nav {
  padding: 0.75rem 0;
  flex: 1;
}

.sidebar-nav .nav-section {
  padding: 0.5rem 1.5rem 0.25rem;
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.3);
  font-weight: 600;
}

.sidebar-nav a {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.65rem 1.5rem;
  color: var(--sidebar-text);
  text-decoration: none;
  font-size: 0.875rem;
  transition: all var(--transition);
  border-left: 3px solid transparent;
  position: relative;
}

.sidebar-nav a:hover {
  background: var(--sidebar-hover);
  color: var(--sidebar-text-active);
}

.sidebar-nav a.active {
  background: rgba(37, 99, 235, 0.12);
  color: var(--sidebar-text-active);
  border-left-color: var(--primary);
}

.sidebar-nav a .nav-icon {
  width: 20px;
  text-align: center;
  font-size: 1rem;
}

.sidebar-nav a .nav-badge {
  margin-left: auto;
  font-size: 0.7rem;
  background: var(--danger);
  color: #fff;
  padding: 0.1rem 0.5rem;
  border-radius: 10px;
  min-width: 18px;
  text-align: center;
}

.sidebar-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid rgba(255,255,255,0.06);
  font-size: 0.8rem;
}

.sidebar-footer .user-info {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.sidebar-footer .user-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-weight: 600;
  font-size: 0.8rem;
}

.sidebar-footer .user-name { color: #fff; font-weight: 500; }
.sidebar-footer .user-role { font-size: 0.7rem; }

.sidebar-footer a {
  display: block;
  color: var(--sidebar-text);
  text-decoration: none;
  font-size: 0.8rem;
  padding: 0.3rem 0;
  transition: color var(--transition);
}

.sidebar-footer a:hover { color: var(--sidebar-text-active); }

/* === MAIN CONTENT === */
.main-content {
  margin-left: 260px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* === NAVBAR === */
.navbar {
  background: var(--card-bg);
  border-bottom: 1px solid var(--border);
  padding: 0 1.5rem;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 900;
  box-shadow: var(--shadow);
}

.navbar-left {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.navbar-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--text);
  cursor: pointer;
  padding: 0.25rem;
}

.navbar-search {
  position: relative;
}

.navbar-search input {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.5rem 1rem 0.5rem 2.5rem;
  font-size: 0.85rem;
  width: 280px;
  transition: all var(--transition);
}

.navbar-search input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
  width: 320px;
}

.navbar-search .search-icon {
  position: absolute;
  left: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
}

.navbar-right {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.navbar-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.4rem;
  border-radius: var(--radius);
  transition: all var(--transition);
  position: relative;
}

.navbar-btn:hover { background: var(--bg-secondary); color: var(--text); }

.navbar-btn .notif-dot {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 8px;
  height: 8px;
  background: var(--danger);
  border-radius: 50%;
  border: 2px solid var(--card-bg);
}

/* === PAGE CONTENT === */
.page-content {
  padding: 1.5rem;
  flex: 1;
}

.page-header {
  margin-bottom: 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.page-header h1 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
}

.page-header .breadcrumb {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.page-header .breadcrumb a {
  color: var(--primary);
  text-decoration: none;
}

.page-header .breadcrumb a:hover { text-decoration: underline; }

/* === CARDS === */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: box-shadow var(--transition);
}

.card:hover { box-shadow: var(--shadow-md); }

.card-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.card-header h5 {
  font-size: 0.95rem;
  font-weight: 600;
}

.card-body { padding: 1.25rem; }

.card-footer {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border);
  background: var(--bg-secondary);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* === STAT CARDS === */
.stat-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.25rem;
  box-shadow: var(--shadow);
  transition: all var(--transition);
}

.stat-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.stat-card .stat-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  margin-bottom: 1rem;
}

.stat-card .stat-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.stat-card .stat-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--text);
  margin: 0.25rem 0;
}

.stat-card .stat-change {
  font-size: 0.8rem;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

.stat-change.up { color: var(--success); }
.stat-change.down { color: var(--danger); }

/* === TABLES === */
.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

table thead {
  background: var(--bg-secondary);
}

table thead th {
  padding: 0.75rem 1rem;
  text-align: left;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border-bottom: 2px solid var(--border);
  white-space: nowrap;
}

table tbody td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.875rem;
}

table tbody tr:hover { background: rgba(37, 99, 235, 0.02); }

table tbody tr:nth-child(even) { background: rgba(0,0,0,0.01); }
table tbody tr:nth-child(even):hover { background: rgba(37, 99, 235, 0.03); }

table .actions {
  white-space: nowrap;
  display: flex;
  gap: 0.35rem;
}

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

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  margin-bottom: 0.35rem;
}

.form-control {
  width: 100%;
  padding: 0.55rem 0.85rem;
  font-size: 0.875rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card-bg);
  color: var(--text);
  transition: all var(--transition);
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.form-control.error { border-color: var(--danger); }

textarea.form-control { resize: vertical; min-height: 80px; }

select.form-control {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2364748B' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

.form-text {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.form-error {
  font-size: 0.75rem;
  color: var(--danger);
  margin-top: 0.25rem;
}

.form-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 1.1rem;
  font-size: 0.85rem;
  font-weight: 500;
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

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

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

.btn-secondary { background: #fff; color: var(--text); border-color: var(--border); }
.btn-secondary:hover { background: var(--bg-secondary); }

.btn-success { background: var(--success); color: #fff; }
.btn-success:hover { background: #059669; }

.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #DC2626; }

.btn-warning { background: var(--warning); color: #fff; }
.btn-warning:hover { background: #D97706; }

.btn-sm { padding: 0.35rem 0.7rem; font-size: 0.8rem; }
.btn-lg { padding: 0.75rem 1.5rem; font-size: 1rem; }

/* === BADGES === */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.6rem;
  font-size: 0.7rem;
  font-weight: 500;
  border-radius: 999px;
  white-space: nowrap;
}

.badge-primary { background: var(--primary-light); color: var(--primary); }
.badge-success { background: var(--success-light); color: #065F46; }
.badge-warning { background: var(--warning-light); color: #92400E; }
.badge-danger { background: var(--danger-light); color: #991B1B; }
.badge-info { background: var(--info-light); color: #1E40AF; }
.badge-secondary { background: #F1F5F9; color: var(--text-secondary); }

/* === ALERTS === */
.alert {
  padding: 0.85rem 1rem;
  border-radius: var(--radius);
  margin-bottom: 1rem;
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.alert-success { background: var(--success-light); color: #065F46; border: 1px solid #A7F3D0; }
.alert-danger { background: var(--danger-light); color: #991B1B; border: 1px solid #FECACA; }
.alert-warning { background: var(--warning-light); color: #92400E; border: 1px solid #FDE68A; }
.alert-info { background: var(--info-light); color: #1E40AF; border: 1px solid #BFDBFE; }

.alert-close {
  margin-left: auto;
  background: none;
  border: none;
  font-size: 1.1rem;
  cursor: pointer;
  opacity: 0.5;
  color: inherit;
}

.alert-close:hover { opacity: 1; }

/* === PAGINATION === */
.pagination {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-top: 1rem;
  justify-content: center;
}

.pagination a, .pagination span {
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.8rem;
  color: var(--text);
  text-decoration: none;
  transition: all var(--transition);
}

.pagination a:hover { background: var(--bg-secondary); border-color: var(--primary); color: var(--primary); }
.pagination .active { background: var(--primary); color: #fff; border-color: var(--primary); }
.pagination .disabled { opacity: 0.5; pointer-events: none; }

/* === LOGIN PAGE === */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #1A2A3A 0%, #1E3A5F 100%);
  padding: 1rem;
}

.login-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 2.5rem;
  width: 100%;
  max-width: 420px;
  box-shadow: var(--shadow-lg);
}

.login-card .login-logo {
  text-align: center;
  margin-bottom: 2rem;
}

.login-card .login-logo h2 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text);
}

.login-card .login-logo h2 span { color: var(--primary); }
.login-card .login-logo p { color: var(--text-secondary); font-size: 0.85rem; margin-top: 0.25rem; }

.login-card .form-group { margin-bottom: 1.25rem; }

.login-card .btn { width: 100%; justify-content: center; padding: 0.7rem; }

.login-card .login-footer {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* === EMPTY STATE === */
.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--text-secondary);
}

.empty-state .empty-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
  opacity: 0.5;
}

.empty-state h3 { color: var(--text); margin-bottom: 0.5rem; }
.empty-state p { margin-bottom: 1.5rem; }

/* === MODAL === */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  z-index: 2000;
  align-items: center;
  justify-content: center;
}

.modal-overlay.show { display: flex; }

.modal {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  width: 90%;
  max-width: 560px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: var(--shadow-lg);
}

.modal-header {
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h5 { font-size: 1rem; font-weight: 600; }

.modal-close {
  background: none;
  border: none;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--text-secondary);
}

.modal-body { padding: 1.25rem; }
.modal-footer {
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
  gap: 0.5rem;
}

/* === GRID === */
.grid { display: grid; gap: 1.25rem; }
.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 === */
.d-flex { display: flex; }
.align-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--text-secondary); }
.text-sm { font-size: 0.8rem; }
.font-bold { font-weight: 600; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* === RESPONSIVE === */
@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .main-content { margin-left: 0; }
  .navbar-toggle { display: block; }
  .navbar-search { display: none; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .page-content { padding: 1rem; }
}

/* === TOAST NOTIFICATIONS === */
.toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 5000;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
  min-width: 280px;
  max-width: 400px;
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from { transform: translateX(100%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}

.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--danger); }
.toast.warning { border-left: 3px solid var(--warning); }
.toast.info { border-left: 3px solid var(--info); }

/* === SIDEBAR OVERLAY === */
.sidebar-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.4);
  z-index: 999;
}

.sidebar-overlay.show { display: block; }