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

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-900: #111827;
  --sidebar-width: 250px;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  background: var(--gray-100);
  color: var(--gray-900);
  min-height: 100vh;
}

.page {
  display: none;
}

.page.active {
  display: flex;
}

/* Login Page */
#login-page {
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.login-container {
  background: white;
  padding: 2.5rem;
  border-radius: 12px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
  width: 100%;
  max-width: 400px;
}

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

.login-header h1 {
  color: var(--primary);
  margin-bottom: 0.5rem;
}

.login-header p {
  color: var(--gray-500);
}

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

.login-form label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--gray-700);
}

.login-form input {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.2s;
}

.login-form input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.error-message {
  color: var(--danger);
  font-size: 0.875rem;
  margin-bottom: 1rem;
  display: none;
}

.error-message.show {
  display: block;
}

/* Buttons */
.btn {
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
}

.btn-primary {
  background: var(--primary);
  color: white;
  width: 100%;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-outline {
  background: transparent;
  border: 1px solid var(--gray-300);
  color: var(--gray-700);
}

.btn-outline:hover {
  background: var(--gray-100);
}

.btn-sm {
  padding: 0.4rem 0.8rem;
  font-size: 0.875rem;
}

.btn-success {
  background: var(--success);
  color: white;
}

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

/* App Layout */
#app {
  display: flex;
  min-height: 100vh;
}

/* Sidebar */
.sidebar {
  width: var(--sidebar-width);
  background: var(--gray-900);
  color: white;
  display: flex;
  flex-direction: column;
  position: fixed;
  height: 100vh;
}

.sidebar-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--gray-700);
}

.sidebar-header h2 {
  font-size: 1.25rem;
  color: white;
}

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

.nav-item {
  display: flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  color: var(--gray-300);
  text-decoration: none;
  transition: all 0.2s;
}

.nav-item:hover {
  background: var(--gray-700);
  color: white;
}

.nav-item.active {
  background: var(--primary);
  color: white;
}

.nav-item.hidden {
  display: none;
}

.nav-icon {
  margin-right: 0.75rem;
  font-size: 1.1rem;
}

.sidebar-footer {
  padding: 1rem 1.5rem;
  border-top: 1px solid var(--gray-700);
}

.admin-info {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  font-size: 0.875rem;
}

.role-badge {
  background: var(--primary);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  text-transform: uppercase;
}

/* Main Content */
.main-content {
  flex: 1;
  margin-left: var(--sidebar-width);
  display: flex;
  flex-direction: column;
}

.main-header {
  background: white;
  padding: 1rem 2rem;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.main-header h1 {
  font-size: 1.5rem;
  color: var(--gray-900);
}

.header-actions {
  color: var(--gray-500);
  font-size: 0.875rem;
}

.content {
  flex: 1;
  padding: 2rem;
}

/* Sections */
.section {
  display: none;
}

.section.active {
  display: block;
}

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

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  margin-bottom: 1.5rem;
}

.stat-card {
  background: white;
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  text-align: center;
}

.stat-value {
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--primary);
}

.stat-label {
  color: var(--gray-500);
  margin-top: 0.5rem;
}

.stat-card.stat-pending .stat-value {
  color: var(--warning);
}

.stat-card.stat-active .stat-value {
  color: var(--primary);
}

.stat-card.stat-success .stat-value {
  color: var(--success);
}

/* Tables */
.table-container {
  background: white;
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  overflow: hidden;
}

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

.data-table th,
.data-table td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid var(--gray-200);
}

.data-table th {
  background: var(--gray-50);
  font-weight: 600;
  color: var(--gray-700);
}

.data-table tbody tr:hover {
  background: var(--gray-50);
}

.data-table .actions {
  display: flex;
  gap: 0.5rem;
}

/* Badges */
.badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
}

.badge-success {
  background: #d1fae5;
  color: #065f46;
}

.badge-warning {
  background: #fef3c7;
  color: #92400e;
}

.badge-danger {
  background: #fee2e2;
  color: #991b1b;
}

.badge-info {
  background: #dbeafe;
  color: #1e40af;
}

/* Search */
.search-input {
  padding: 0.5rem 1rem;
  border: 1px solid var(--gray-300);
  border-radius: 8px;
  width: 300px;
}

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

.setting-card {
  background: white;
  padding: 1.5rem;
  border-radius: 12px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.setting-card h4 {
  margin-bottom: 0.5rem;
  color: var(--gray-700);
}

.setting-card p {
  font-size: 0.875rem;
  color: var(--gray-500);
  margin-bottom: 1rem;
}

.setting-card input {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--gray-300);
  border-radius: 6px;
  margin-bottom: 0.5rem;
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

.modal.show {
  display: flex;
}

.modal-content {
  background: white;
  border-radius: 12px;
  width: 100%;
  max-width: 500px;
  max-height: 90vh;
  overflow: auto;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.5rem;
  border-bottom: 1px solid var(--gray-200);
}

.modal-header h3 {
  font-size: 1.25rem;
}

.modal-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray-500);
}

.modal-body {
  padding: 1.5rem;
}

.modal-body .form-group {
  margin-bottom: 1rem;
}

.modal-body label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.modal-body input,
.modal-body select {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--gray-300);
  border-radius: 6px;
}

/* Responsive */
@media (max-width: 1024px) {
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .settings-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  .sidebar {
    width: 60px;
  }

  .sidebar-header h2,
  .nav-item span:not(.nav-icon),
  .admin-info,
  .sidebar-footer .btn {
    display: none;
  }

  .main-content {
    margin-left: 60px;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }
}