/* Reset and Base Styles */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Light Theme Colors */
  --primary-color: #2c5aa0;
  --primary-light: #4a90e2;
  --primary-dark: #1e3d6f;
  --secondary-color: #27ae60;
  --accent-color: #e74c3c;
  --background-color: #f8f9fa;
  --surface-color: #ffffff;
  --text-primary: #333333;
  --text-secondary: #666666;
  --text-muted: #999999;
  --border-color: #e1e5e9;
  --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.15);
  --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.2);
  --border-radius: 8px;
  --border-radius-large: 12px;
  --transition: all 0.3s ease;
}

[data-theme="dark"] {
  --primary-color: #4a90e2;
  --primary-light: #6ba3f0;
  --primary-dark: #357abd;
  --secondary-color: #2ecc71;
  --accent-color: #e74c3c;
  --background-color: #1a1a1a;
  --surface-color: #2d2d2d;
  --text-primary: #ffffff;
  --text-secondary: #cccccc;
  --text-muted: #999999;
  --border-color: #404040;
  --shadow-light: 0 2px 10px rgba(0, 0, 0, 0.3);
  --shadow-medium: 0 4px 20px rgba(0, 0, 0, 0.4);
  --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.5);
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background-color: var(--background-color);
  color: var(--text-primary);
  line-height: 1.6;
  transition: var(--transition);
}

body[data-theme="dark"] {
  background-color: var(--background-color);
  color: var(--text-primary);
}

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

.page-wrapper {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.main-content {
  flex: 1;
  padding: 2rem 0;
}

/* Header and Navigation */
.header {
  background: var(--surface-color);
  box-shadow: var(--shadow-light);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 0;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;
}

.nav-link {
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
}

.nav-link:hover,
.nav-link.active {
  color: var(--primary-color);
  background-color: var(--background-color);
}

.user-menu {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.logout-btn {
  background: none;
  border: 1px solid var(--border-color);
  color: var(--text-secondary);
  padding: 0.5rem 1rem;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: var(--transition);
}

.logout-btn:hover {
  background-color: var(--accent-color);
  color: white;
  border-color: var(--accent-color);
}

/* Mobile Navigation */
.mobile-menu-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-primary);
}

/* Cards and Surfaces */
.card {
  background: var(--surface-color);
  border-radius: var(--border-radius-large);
  box-shadow: var(--shadow-light);
  padding: 2rem;
  margin-bottom: 2rem;
  transition: var(--transition);
}

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

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

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.card-subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

/* Forms */
.form-group {
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
  font-weight: 500;
  font-size: 0.9rem;
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem;
  border: 2px solid var(--border-color);
  border-radius: var(--border-radius);
  font-size: 1rem;
  background: var(--surface-color);
  color: var(--text-primary);
  transition: var(--transition);
}

[data-theme="dark"] .form-input,
[data-theme="dark"] .form-select,
[data-theme="dark"] .form-textarea {
  background: var(--surface-color);
  color: var(--text-primary);
  border-color: var(--border-color);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(74, 144, 226, 0.1);
}

.form-input:disabled {
  background: var(--background-color);
  color: var(--text-muted);
  cursor: not-allowed;
}

[data-theme="dark"] .form-input:disabled {
  background: var(--background-color);
  color: var(--text-muted);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--border-radius);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  gap: 0.5rem;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-light) 100%);
  color: white;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.btn-secondary {
  background: var(--surface-color);
  color: var(--text-primary);
  border: 2px solid var(--border-color);
}

.btn-secondary:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

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

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

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

/* Tables */
.table-container {
  overflow-x: auto;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow-light);
}

.table {
  width: 100%;
  border-collapse: collapse;
  background: var(--surface-color);
}

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

.table th {
  background: var(--background-color);
  font-weight: 600;
  color: var(--text-primary);
}

[data-theme="dark"] .table th {
  background: var(--background-color);
  color: var(--text-primary);
}

.table tr:hover {
  background: var(--background-color);
}

[data-theme="dark"] .table tr:hover {
  background: var(--background-color);
}

/* Grid System */
.grid {
  display: grid;
  gap: 2rem;
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* Statistics Cards */
.stat-card {
  text-align: center;
  padding: 1.5rem;
}

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

.stat-label {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

/* Messages and Alerts */
.alert {
  padding: 1rem;
  border-radius: var(--border-radius);
  margin-bottom: 1rem;
  display: none;
}

.alert.show {
  display: block;
  animation: slideIn 0.3s ease;
}

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

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

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

/* Error States */
.error-message {
  color: var(--accent-color);
  font-size: 0.85rem;
  margin-top: 0.25rem;
  display: none;
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(231, 76, 60, 0.1);
}

/* Loading States */
.loading {
  position: relative;
  color: transparent;
}

.loading::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 20px;
  height: 20px;
  margin: -10px 0 0 -10px;
  border: 2px solid transparent;
  border-top: 2px solid currentColor;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

/* Animations */
@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes spin {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Accessibility */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* Focus indicators */
*:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 15px;
  }

  .header-content {
    flex-wrap: wrap;
  }

  .nav-menu {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0;
    margin-top: 1rem;
  }

  .nav-menu.active {
    display: flex;
  }

  .mobile-menu-toggle {
    display: block;
  }

  .card {
    padding: 1.5rem;
  }

  .grid {
    gap: 1rem;
  }

  .stat-number {
    font-size: 2rem;
  }

  .table-container {
    font-size: 0.9rem;
  }

  .table th,
  .table td {
    padding: 0.75rem 0.5rem;
  }
}

@media (max-width: 480px) {
  .main-content {
    padding: 1rem 0;
  }

  .card {
    padding: 1rem;
  }

  .btn {
    padding: 0.625rem 1rem;
    font-size: 0.9rem;
  }
}

/* Print Styles */
@media print {
  .header,
  .nav-menu,
  .user-menu,
  .btn {
    display: none;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}