:root {
  /* Color Palette - Premium gradients and modern colors */
  --primary: #667eea;
  --primary-dark: #5568d3;
  --primary-light: #7c8ff0;
  --secondary: #764ba2;
  --accent: #f093fb;
  
  --success: #10b981;
  --success-dark: #059669;
  --success-light: #34d399;
  
  --warning: #f59e0b;
  --warning-dark: #d97706;
  --warning-light: #fbbf24;
  
  --danger: #ef4444;
  --danger-dark: #dc2626;
  --danger-light: #f87171;
  
  --info: #3b82f6;
  --info-dark: #2563eb;
  --info-light: #60a5fa;
  
  /* Neutral colors */
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
  --gradient-warning: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  --gradient-danger: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
  --gradient-info: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
  --gradient-purple: linear-gradient(135deg, #a855f7 0%, #6366f1 100%);
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-glow: 0 0 20px rgba(102, 126, 234, 0.3);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  
  /* Border radius */
  --radius-sm: 0.25rem;
  --radius: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-full: 9999px;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', Consolas, Monaco, monospace;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition: 250ms ease;
  --transition-slow: 350ms ease;
}

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

body {
  font-family: var(--font-sans);
  background: var(--gray-50);
  color: var(--gray-900);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
  background: var(--gray-400);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--gray-500);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: var(--gray-900);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--primary-dark);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.625rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
  width: 300px;
  height: 300px;
}

.btn-primary {
  background: var(--gradient-primary);
  color: white;
  box-shadow: var(--shadow);
}

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

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

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

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

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

.btn-warning {
  background: var(--gradient-warning);
  color: white;
  box-shadow: var(--shadow);
}

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

.btn-secondary {
  background: var(--gray-200);
  color: var(--gray-700);
}

.btn-secondary:hover {
  background: var(--gray-300);
}

.btn-outline {
  background: transparent;
  color: var(--primary);
  border: 2px solid var(--primary);
}

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

.btn-sm {
  padding: 0.375rem 1rem;
  font-size: 0.8rem;
}

.btn-lg {
  padding: 0.875rem 2rem;
  font-size: 1rem;
}

/* Form elements */
.form-group {
  margin-bottom: var(--spacing-lg);
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--gray-700);
  font-size: 0.875rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
input[type="tel"],
select,
textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--gray-200);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 0.9375rem;
  transition: all var(--transition);
  background: white;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

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

/* Cards */
.card {
  background: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  padding: var(--spacing-xl);
  transition: all var(--transition);
}

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

.card-header {
  padding-bottom: var(--spacing-lg);
  border-bottom: 2px solid var(--gray-100);
  margin-bottom: var(--spacing-lg);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0;
}

/* Badges */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.badge-pending {
  background: var(--warning-light);
  color: var(--warning-dark);
}

.badge-confirmed {
  background: var(--success-light);
  color: var(--success-dark);
}

.badge-rejected {
  background: var(--danger-light);
  color: var(--danger-dark);
}

.badge-cancelled {
  background: var(--gray-300);
  color: var(--gray-700);
}

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

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

thead {
  background: var(--gradient-primary);
  color: white;
}

th {
  padding: 1rem;
  text-align: left;
  font-weight: 600;
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

td {
  padding: 1rem;
  border-bottom: 1px solid var(--gray-100);
}

tbody tr {
  transition: background var(--transition-fast);
}

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

/* Alerts */
.alert {
  padding: 1rem 1.5rem;
  border-radius: var(--radius);
  margin-bottom: var(--spacing-lg);
  border-left: 4px solid;
  animation: slideIn 0.3s ease;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateY(-10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.alert-success {
  background: #d1fae5;
  border-color: var(--success);
  color: var(--success-dark);
}

.alert-error {
  background: #fee2e2;
  border-color: var(--danger);
  color: var(--danger-dark);
}

.alert-warning {
  background: #fef3c7;
  border-color: var(--warning);
  color: var(--warning-dark);
}

.alert-info {
  background: #dbeafe;
  border-color: var(--info);
  color: var(--info-dark);
}

/* Loading spinner */
.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid var(--gray-200);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255, 255, 255, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
}

/* Utility classes */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

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

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

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-md); }
.gap-3 { gap: var(--spacing-lg); }

.w-full { width: 100%; }
.h-full { height: 100%; }

.hidden { display: none; }

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.3s ease;
}

.slide-up {
  animation: slideUp 0.4s ease;
}

/* Grid Utilities */
.grid { display: grid; gap: var(--spacing-md); }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid-span-2 { grid-column: span 2; }
.grid-span-4 { grid-column: span 4; }

.gap-sm { gap: var(--spacing-sm); }
.mb-xs { margin-bottom: var(--spacing-xs); }
.p-sm { padding: var(--spacing-sm); }