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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
}

/* Login Page */
.page {
  display: none;
}

.page.active {
  display: block;
}

.login-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 20px;
}

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

.login-card h1 {
  font-size: 28px;
  margin-bottom: 8px;
  color: #333;
}

.subtitle {
  color: #666;
  margin-bottom: 30px;
}

/* Forms */
.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  color: #333;
  font-weight: 500;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 12px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 14px;
  transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
  outline: none;
  border-color: #667eea;
}

/* Buttons */
.btn {
  padding: 12px 24px;
  border: none;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.btn-primary {
  background: #667eea;
  color: white;
}

.btn-primary:hover {
  background: #5568d3;
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
  background: #6c757d;
  color: white;
}

.btn-secondary:hover {
  background: #5a6268;
}

.btn-danger {
  background: #dc3545;
  color: white;
}

.btn-danger:hover {
  background: #c82333;
}

.btn-block {
  width: 100%;
  justify-content: center;
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

/* Dashboard Header */
.dashboard-header {
  background: white;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
  padding: 16px 0;
}

.header-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-container h1 {
  font-size: 24px;
  color: #333;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.admin-name {
  color: #667eea;
  font-weight: 600;
}

/* Navigation */
.dashboard-nav {
  background: white;
  border-bottom: 1px solid #eee;
  padding: 0 24px;
  display: flex;
  gap: 8px;
  max-width: 1400px;
  margin: 0 auto;
}

.nav-btn {
  background: none;
  border: none;
  padding: 16px 24px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: #666;
  border-bottom: 3px solid transparent;
  transition: all 0.3s;
}

.nav-btn:hover {
  color: #667eea;
}

.nav-btn.active {
  color: #667eea;
  border-bottom-color: #667eea;
}

/* Main Content */
.dashboard-content {
  max-width: 1400px;
  margin: 0 auto;
  padding: 32px 24px;
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.tab-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
}

.tab-header h2 {
  font-size: 24px;
  color: white;
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
  margin-bottom: 32px;
}

.stat-card {
  background: white;
  border-radius: 12px;
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  transition: transform 0.3s;
}

.stat-card:hover {
  transform: translateY(-4px);
}

.stat-icon {
  font-size: 48px;
}

.stat-info h3 {
  font-size: 32px;
  color: #333;
  margin-bottom: 4px;
}

.stat-info p {
  color: #666;
  font-size: 14px;
}

/* Quick Actions */
.quick-actions {
  background: white;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.quick-actions h3 {
  margin-bottom: 16px;
  color: #333;
}

.quick-actions .btn {
  margin-right: 12px;
  margin-bottom: 8px;
}

/* Data Table */
.data-table {
  background: white;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  overflow-x: auto;
}

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

thead th {
  text-align: left;
  padding: 12px;
  font-weight: 600;
  color: #666;
  border-bottom: 2px solid #eee;
}

tbody td {
  padding: 12px;
  border-bottom: 1px solid #f5f5f5;
  color: #333;
}

tbody tr:hover {
  background: #f9f9f9;
}

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

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

.modal.active {
  display: flex;
}

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

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 24px;
  border-bottom: 1px solid #eee;
}

.modal-header h3 {
  font-size: 20px;
  color: #333;
}

.modal-close {
  background: none;
  border: none;
  font-size: 28px;
  cursor: pointer;
  color: #999;
  transition: color 0.3s;
}

.modal-close:hover {
  color: #333;
}

.modal-content form {
  padding: 24px;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 24px;
}

/* Messages */
.error-message {
  background: #f8d7da;
  color: #721c24;
  padding: 12px;
  border-radius: 6px;
  margin-top: 16px;
}

.success-message {
  background: #d4edda;
  color: #155724;
  padding: 12px;
  border-radius: 6px;
  margin-top: 16px;
}

/* Responsive */
@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .dashboard-nav {
    overflow-x: auto;
  }

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

  .tab-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }

  .data-table {
    font-size: 12px;
  }

  thead th,
  tbody td {
    padding: 8px;
  }
}

/* Loading Animation */
@keyframes spin {
  to { transform: rotate(360deg); }
}

.btn-loader {
  animation: spin 1s linear infinite;
}

/* Badge */
.badge {
  display: inline-block;
  padding: 4px 8px;
  font-size: 12px;
  font-weight: 600;
  border-radius: 4px;
  background: #667eea;
  color: white;
}

.badge-success {
  background: #28a745;
}

.badge-warning {
  background: #ffc107;
  color: #333;
}

.badge-danger {
  background: #dc3545;
}

/* Code Display */
.code {
  font-family: 'Courier New', monospace;
  background: #f5f5f5;
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 13px;
}