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

:root {
  --primary-color: #0066cc;
  --secondary-color: #6c757d;
  --success-color: #28a745;
  --danger-color: #dc3545;
  --warning-color: #ffc107;
  --info-color: #17a2b8;
  --light-gray: #f8f9fa;
  --medium-gray: #dee2e6;
  --dark-gray: #343a40;
  --border-radius: 8px;
  --box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--light-gray);
  color: #333;
  line-height: 1.6;
}

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

.login-box {
  background: white;
  padding: 40px;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  width: 100%;
  max-width: 400px;
}

.login-box h1 {
  text-align: center;
  margin-bottom: 10px;
  color: var(--primary-color);
}

.subtitle {
  text-align: center;
  color: var(--secondary-color);
  margin-bottom: 30px;
}

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

.form-group label {
  display: block;
  margin-bottom: 5px;
  font-weight: 500;
  color: var(--dark-gray);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--medium-gray);
  border-radius: 4px;
  font-size: 14px;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
}

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

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 15px;
}

/* Buttons */
.btn {
  padding: 10px 20px;
  border: none;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

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

.btn-primary:hover {
  background-color: #0052a3;
}

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

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

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

.btn-sm {
  padding: 5px 10px;
  font-size: 12px;
}

/* Messages */
.error-message,
.success-message,
.info-message {
  padding: 10px 15px;
  border-radius: 4px;
  margin-top: 15px;
  font-size: 14px;
}

.error-message {
  background-color: #f8d7da;
  color: #721c24;
  border: 1px solid #f5c6cb;
}

.success-message {
  background-color: #d4edda;
  color: #155724;
  border: 1px solid #c3e6cb;
}

.info-message {
  background-color: #d1ecf1;
  color: #0c5460;
  border: 1px solid #bee5eb;
}

/* App Layout */
.app-header {
  background: white;
  box-shadow: var(--box-shadow);
  padding: 15px 0;
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header-content h1 {
  color: var(--primary-color);
  font-size: 24px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 15px;
}

.user-info {
  color: var(--dark-gray);
  font-weight: 500;
}

/* Navigation */
.app-nav {
  background: white;
  box-shadow: var(--box-shadow);
  margin-top: 1px;
}

.app-nav .container {
  display: flex;
  gap: 5px;
}

.nav-btn {
  background: transparent;
  border: none;
  padding: 15px 25px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  color: var(--secondary-color);
  border-bottom: 3px solid transparent;
  transition: all 0.2s;
}

.nav-btn:hover {
  color: var(--primary-color);
  background-color: var(--light-gray);
}

.nav-btn.active {
  color: var(--primary-color);
  border-bottom-color: var(--primary-color);
}

/* Content */
.app-content {
  padding: 30px 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.view {
  display: none;
}

.view.active {
  display: block;
}

.view-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.view-header h2 {
  color: var(--dark-gray);
}

/* Stats Grid */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.stat-card {
  background: white;
  padding: 30px;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  text-align: center;
}

.stat-value {
  font-size: 48px;
  font-weight: bold;
  color: var(--primary-color);
  margin-bottom: 10px;
}

.stat-label {
  font-size: 16px;
  color: var(--secondary-color);
  text-transform: uppercase;
  letter-spacing: 1px;
}

/* Tables */
.table-container {
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  overflow: hidden;
}

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

.data-table th {
  background-color: var(--light-gray);
  color: var(--dark-gray);
  font-weight: 600;
  text-align: left;
  padding: 15px;
  border-bottom: 2px solid var(--medium-gray);
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.data-table td {
  padding: 15px;
  border-bottom: 1px solid var(--medium-gray);
}

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

.data-table tbody tr:last-child td {
  border-bottom: none;
}

/* Status Badges */
.status-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
}

.status-active {
  background-color: #d4edda;
  color: #155724;
}

.status-inactive {
  background-color: #f8d7da;
  color: #721c24;
}

.status-expiring {
  background-color: #fff3cd;
  color: #856404;
}

/* Modal */
.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0,0,0,0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  padding: 20px;
}

.modal {
  background: white;
  border-radius: var(--border-radius);
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
}

.modal-header {
  padding: 20px;
  border-bottom: 1px solid var(--medium-gray);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.modal-header h3 {
  color: var(--dark-gray);
  margin: 0;
}

.modal-close {
  background: none;
  border: none;
  font-size: 24px;
  cursor: pointer;
  color: var(--secondary-color);
  padding: 0;
  width: 30px;
  height: 30px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  color: var(--dark-gray);
}

.modal-body {
  padding: 20px;
}

.modal-footer {
  padding: 20px;
  border-top: 1px solid var(--medium-gray);
  display: flex;
  justify-content: flex-end;
  gap: 10px;
}

/* Code Block */
.code-block {
  background-color: var(--dark-gray);
  color: #00ff00;
  padding: 15px;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 14px;
  overflow-x: auto;
  margin: 10px 0;
  position: relative;
}

.copy-btn {
  position: absolute;
  top: 10px;
  right: 10px;
  background-color: rgba(255,255,255,0.1);
  color: white;
  border: 1px solid rgba(255,255,255,0.3);
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 12px;
}

.copy-btn:hover {
  background-color: rgba(255,255,255,0.2);
}

/* Loading */
.loading {
  text-align: center;
  padding: 40px;
  color: var(--secondary-color);
}

.loading::after {
  content: '...';
  animation: loading 1.5s infinite;
}

@keyframes loading {
  0%, 20% { content: '.'; }
  40% { content: '..'; }
  60%, 100% { content: '...'; }
}

/* Empty State */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--secondary-color);
}

.empty-state-icon {
  font-size: 64px;
  margin-bottom: 20px;
  opacity: 0.5;
}

/* Responsive */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    gap: 15px;
  }

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

  .form-row {
    grid-template-columns: 1fr;
  }

  .table-container {
    overflow-x: auto;
  }

  .data-table {
    min-width: 600px;
  }

  .modal {
    max-width: 100%;
  }
}