/* Apple-inspired Modern Design System with Light Mode */
:root {
  /* Light Mode Colors */
  --apple-blue: #007AFF;
  --apple-blue-dark: #0056CC;
  --apple-gray: #8E8E93;
  --apple-gray-light: #F2F2F7;
  --apple-gray-dark: #1C1C1E;
  --apple-background: #FFFFFF;
  --apple-background-secondary: #F2F2F7;
  --apple-text-primary: #000000;
  --apple-text-secondary: #3C3C43;
  --apple-border: #C6C6C8;
  --apple-success: #34C759;
  --apple-warning: #FF9500;
  --apple-error: #FF3B30;
  
  /* Typography */
  --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-xxl: 48px;
  
  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  
  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

/* Dark Mode Colors */
[data-theme="dark"],
.dark {
  --apple-background: #000000;
  --apple-background-secondary: #1C1C1E;
  --apple-text-primary: #FFFFFF;
  --apple-text-secondary: #EBEBF5;
  --apple-border: #38383A;
  --apple-gray-light: #1C1C1E;
  --shadow-sm: 0 1px 3px rgba(255, 255, 255, 0.1);
  --shadow-md: 0 4px 12px rgba(255, 255, 255, 0.1);
  --shadow-lg: 0 8px 24px rgba(255, 255, 255, 0.12);
}

/* Base Styles */
* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-family-primary);
  background-color: var(--apple-background);
  color: var(--apple-text-primary);
  line-height: 1.6;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--apple-text-primary);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--spacing-md);
  color: var(--apple-text-secondary);
}

/* Navigation */
.navbar {
  background-color: rgba(255, 255, 255, 0.8) !important;
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--apple-border);
  padding: var(--spacing-sm) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  transition: all 0.3s ease;
}

[data-theme="dark"] .navbar {
  background-color: rgba(0, 0, 0, 0.8) !important;
}

.navbar-brand {
  font-weight: var(--font-weight-bold);
  font-size: 1.5rem;
  color: var(--apple-text-primary) !important;
  text-decoration: none;
}

.brand-text {
  background: linear-gradient(135deg, var(--apple-blue) 0%, var(--apple-blue-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.navbar-nav .nav-link {
  color: var(--apple-text-secondary) !important;
  font-weight: var(--font-weight-medium);
  padding: var(--spacing-sm) var(--spacing-md) !important;
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  margin: 0 var(--spacing-xs);
}

.navbar-nav .nav-link:hover {
  color: var(--apple-blue) !important;
  background-color: var(--apple-gray-light);
}

.admin-link {
  background: linear-gradient(135deg, var(--apple-blue), var(--apple-blue-dark));
  color: white !important;
  border-radius: var(--radius-md);
}

.admin-link:hover {
  background: linear-gradient(135deg, var(--apple-blue-dark), var(--apple-blue));
  color: white !important;
}

/* Theme Toggle */
.theme-toggle {
  border: 1px solid var(--apple-border);
  background-color: var(--apple-background);
  color: var(--apple-text-primary);
  border-radius: var(--radius-md);
  padding: var(--spacing-xs) var(--spacing-sm);
  margin-right: var(--spacing-md);
  transition: all 0.2s ease;
}

.theme-toggle:hover {
  background-color: var(--apple-gray-light);
  border-color: var(--apple-blue);
}

/* Buttons */
.btn {
  font-family: var(--font-family-primary);
  font-weight: var(--font-weight-medium);
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  transition: all 0.2s ease;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.btn-primary {
  background-color: var(--apple-blue);
  color: white;
}

.btn-primary:hover {
  background-color: var(--apple-blue-dark);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-outline-primary {
  background-color: transparent;
  color: var(--apple-blue);
  border: 1px solid var(--apple-blue);
}

.btn-outline-primary:hover {
  background-color: var(--apple-blue);
  color: white;
}

.btn-outline-secondary {
  background-color: transparent;
  color: var(--apple-text-secondary);
  border: 1px solid var(--apple-border);
}

.btn-outline-secondary:hover {
  background-color: var(--apple-gray-light);
  color: var(--apple-text-primary);
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.875rem;
}

/* Cards */
.card {
  background-color: var(--apple-background);
  border: 1px solid var(--apple-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  overflow: hidden;
}

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

.card-body {
  padding: var(--spacing-lg);
}

/* Tables */
.table {
  background-color: var(--apple-background);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--apple-border);
}

.table th {
  background-color: var(--apple-background-secondary);
  font-weight: var(--font-weight-semibold);
  color: var(--apple-text-primary);
  border-bottom: 1px solid var(--apple-border);
  padding: var(--spacing-md);
}

.table td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--apple-border);
  color: var(--apple-text-secondary);
}

.table-striped tbody tr:nth-of-type(odd) {
  background-color: var(--apple-background-secondary);
}

/* Forms */
.form-control {
  border: 1px solid var(--apple-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  font-family: var(--font-family-primary);
  background-color: var(--apple-background);
  color: var(--apple-text-primary);
  transition: all 0.2s ease;
}

.form-control:focus {
  border-color: var(--apple-blue);
  box-shadow: 0 0 0 3px rgba(0, 122, 255, 0.1);
  outline: none;
}

/* Dropdown */
.dropdown-menu {
  background-color: var(--apple-background);
  border: 1px solid var(--apple-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-sm);
}

.dropdown-item {
  color: var(--apple-text-secondary);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
}

.dropdown-item:hover {
  background-color: var(--apple-gray-light);
  color: var(--apple-text-primary);
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Main Content */
main {
  min-height: calc(100vh - 200px);
  padding: var(--spacing-xl) 0;
}

/* Footer */
.footer {
  background-color: var(--apple-background-secondary);
  border-top: 1px solid var(--apple-border);
  padding: var(--spacing-lg) 0;
  margin-top: var(--spacing-xxl);
  color: var(--apple-text-secondary);
  text-align: center;
}

.footer-link {
  color: var(--apple-text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--apple-blue);
}

/* Welcome Section */
.welcome-section {
  text-align: center;
  padding: var(--spacing-xxl) 0;
  background: linear-gradient(135deg, var(--apple-background) 0%, var(--apple-background-secondary) 100%);
  border-radius: var(--radius-xl);
  margin-bottom: var(--spacing-xl);
}

.welcome-section h1 {
  font-size: 3rem;
  font-weight: var(--font-weight-bold);
  background: linear-gradient(135deg, var(--apple-blue) 0%, var(--apple-blue-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--spacing-lg);
}

/* User Management Section */
.user-management {
  background-color: var(--apple-background);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  margin-top: var(--spacing-xl);
}

.user-management h3 {
  color: var(--apple-text-primary);
  margin-bottom: var(--spacing-lg);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.user-management h3::before {
  content: '👥';
  font-size: 1.5rem;
}

/* Loading States */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xl);
  color: var(--apple-text-secondary);
}

.loading::after {
  content: '';
  width: 20px;
  height: 20px;
  border: 2px solid var(--apple-border);
  border-top: 2px solid var(--apple-blue);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-left: var(--spacing-sm);
}

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

/* Responsive Design */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .welcome-section h1 {
    font-size: 2rem;
  }
  
  .user-management {
    padding: var(--spacing-lg);
  }
  
  .table-responsive {
    border-radius: var(--radius-md);
  }
}

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

.fade-in {
  animation: fadeIn 0.6s ease-out;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-primary { color: var(--apple-blue) !important; }
.text-secondary { color: var(--apple-text-secondary) !important; }
.text-success { color: var(--apple-success) !important; }
.text-danger { color: var(--apple-error) !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: var(--spacing-xs) !important; }
.mb-2 { margin-bottom: var(--spacing-sm) !important; }
.mb-3 { margin-bottom: var(--spacing-md) !important; }
.mb-4 { margin-bottom: var(--spacing-lg) !important; }
.mb-5 { margin-bottom: var(--spacing-xl) !important; }

.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: var(--spacing-xs) !important; }
.mt-2 { margin-top: var(--spacing-sm) !important; }
.mt-3 { margin-top: var(--spacing-md) !important; }
.mt-4 { margin-top: var(--spacing-lg) !important; }
.mt-5 { margin-top: var(--spacing-xl) !important; }