/* Base Styles */
:root {
  /* Color System */
  --color-primary: #2563EB;
  --color-primary-light: #3B82F6;
  --color-primary-dark: #1D4ED8;
  
  --color-secondary: #0D9488;
  --color-secondary-light: #14B8A6;
  --color-secondary-dark: #0F766E;
  
  --color-tertiary: #7C3AED;
  --color-tertiary-light: #8B5CF6;
  --color-tertiary-dark: #6D28D9;
  
  --color-success: #10B981;
  --color-success-light: #34D399;
  --color-success-dark: #059669;
  
  --color-warning: #F59E0B;
  --color-warning-light: #FBBF24;
  --color-warning-dark: #D97706;
  
  --color-error: #EF4444;
  --color-error-light: #F87171;
  --color-error-dark: #DC2626;
  
  --color-gray-50: #F9FAFB;
  --color-gray-100: #F3F4F6;
  --color-gray-200: #E5E7EB;
  --color-gray-300: #D1D5DB;
  --color-gray-400: #9CA3AF;
  --color-gray-500: #6B7280;
  --color-gray-600: #4B5563;
  --color-gray-700: #374151;
  --color-gray-800: #1F2937;
  --color-gray-900: #111827;
  
  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  
  /* Spacing (8px grid) */
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  /* Border Radius */
  --radius-sm: 0.25rem;  /* 4px */
  --radius-md: 0.375rem; /* 6px */
  --radius-lg: 0.5rem;   /* 8px */
  --radius-xl: 0.75rem;  /* 12px */
  --radius-full: 9999px;
}

/* Reset & Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--color-gray-800);
  background-color: var(--color-gray-50);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  margin-bottom: var(--space-4);
}

h1 {
  font-size: 2rem;
}

h2 {
  font-size: 1.5rem;
}

h3 {
  font-size: 1.25rem;
}

h4 {
  font-size: 1.125rem;
}

p {
  margin-bottom: var(--space-4);
}

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

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

/* Forms */
label {
  display: block;
  margin-bottom: var(--space-2);
  font-weight: 500;
  color: var(--color-gray-700);
}

input, select, textarea {
  width: 100%;
  padding: var(--space-3);
  font-family: var(--font-family);
  font-size: 1rem;
  color: var(--color-gray-800);
  background-color: white;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group {
  margin-bottom: var(--space-5);
}

.form-row {
  display: flex;
  margin: 0 -0.5rem;
}

.form-row .form-group {
  flex: 1;
  margin: 0 0.5rem;
}

.input-error {
  margin-top: var(--space-1);
  font-size: 0.875rem;
  color: var(--color-error);
}

.error-message {
  margin-bottom: var(--space-4);
  padding: var(--space-3);
  color: var(--color-error-dark);
  background-color: rgba(239, 68, 68, 0.1);
  border-radius: var(--radius-md);
  font-size: 0.875rem;
  font-weight: 500;
  display: none;
}

.checkbox-list {
  max-height: 200px;
  overflow-y: auto;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  padding: var(--space-2);
}

.checkbox-item {
  display: flex;
  align-items: center;
  padding: var(--space-2);
  border-bottom: 1px solid var(--color-gray-200);
}

.checkbox-item:last-child {
  border-bottom: none;
}

.checkbox-item input[type="checkbox"] {
  width: auto;
  margin-right: var(--space-3);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2) var(--space-4);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.5;
  text-align: center;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.btn i {
  margin-right: var(--space-2);
}

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

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

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

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

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

.btn-tertiary:hover {
  background-color: var(--color-tertiary-dark);
  border-color: var(--color-tertiary-dark);
}

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

.btn-success:hover {
  background-color: var(--color-success-dark);
  border-color: var(--color-success-dark);
}

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

.btn-warning:hover {
  background-color: var(--color-warning-dark);
  border-color: var(--color-warning-dark);
}

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

.btn-danger:hover {
  background-color: var(--color-error-dark);
  border-color: var(--color-error-dark);
}

.btn-outline {
  color: var(--color-gray-700);
  background-color: transparent;
  border-color: var(--color-gray-300);
}

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

.btn-icon {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  font-size: 1rem;
}

.btn-icon i {
  margin-right: 0;
}

.btn-block {
  display: block;
  width: 100%;
}

.btn-sm {
  padding: var(--space-1) var(--space-3);
  font-size: 0.75rem;
}

.btn-lg {
  padding: var(--space-3) var(--space-6);
  font-size: 1rem;
}

/* Cards */
.card {
  background-color: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  overflow: hidden;
}

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

.data-table th,
.data-table td {
  padding: var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-gray-200);
}

.data-table th {
  font-weight: 600;
  color: var(--color-gray-700);
  background-color: var(--color-gray-50);
}

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

.data-table tr:hover td {
  background-color: var(--color-gray-50);
}

/* Status Badges */
.badge {
  display: inline-block;
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  line-height: 1;
  text-align: center;
  white-space: nowrap;
  vertical-align: baseline;
  border-radius: var(--radius-full);
  background-color: var(--color-gray-200);
  color: var(--color-gray-800);
}

.badge-primary {
  background-color: rgba(37, 99, 235, 0.1);
  color: var(--color-primary);
}

.badge-success {
  background-color: rgba(16, 185, 129, 0.1);
  color: var(--color-success);
}

.badge-warning {
  background-color: rgba(245, 158, 11, 0.1);
  color: var(--color-warning-dark);
}

.badge-danger {
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--color-error);
}

/* Utilities */
.text-center {
  text-align: center;
}

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

.mb-1 {
  margin-bottom: var(--space-1);
}

.mb-2 {
  margin-bottom: var(--space-2);
}

.mb-3 {
  margin-bottom: var(--space-3);
}

.mb-4 {
  margin-bottom: var(--space-4);
}

.mt-1 {
  margin-top: var(--space-1);
}

.mt-2 {
  margin-top: var(--space-2);
}

.mt-3 {
  margin-top: var(--space-3);
}

.mt-4 {
  margin-top: var(--space-4);
}

/* Responsive */
@media (max-width: 768px) {
  html {
    font-size: 14px;
  }
  
  .form-row {
    flex-direction: column;
  }
  
  .form-row .form-group {
    margin: 0 0 var(--space-5) 0;
  }
}

/* Modal */
.modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 1000;
  overflow-y: auto;
  padding: var(--space-4);
}

.modal-content {
  position: relative;
  background-color: white;
  margin: 2rem auto;
  max-width: 600px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  animation: modalFadeIn 0.3s ease;
}

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

.modal-header {
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.modal-header h2 {
  margin-bottom: 0;
}

.modal-body {
  padding: var(--space-6);
}

.modal-footer {
  padding: var(--space-4) var(--space-6);
  border-top: 1px solid var(--color-gray-200);
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
}

.close-modal {
  background: transparent;
  border: none;
  font-size: 1.5rem;
  line-height: 1;
  cursor: pointer;
  color: var(--color-gray-500);
  transition: color var(--transition-fast);
}

.close-modal:hover {
  color: var(--color-gray-900);
}

/* Toast Notifications */
.toast-container {
  position: fixed;
  bottom: var(--space-4);
  right: var(--space-4);
  z-index: 1100;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.toast {
  min-width: 250px;
  max-width: 350px;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  display: flex;
  align-items: center;
  animation: toastFadeIn 0.3s ease;
}

@keyframes toastFadeIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

.toast-error {
  background-color: var(--color-error);
  color: white;
}

.toast-info {
  background-color: var(--color-primary);
  color: white;
}

.toast-warning {
  background-color: var(--color-warning);
  color: white;
}

.toast i {
  margin-right: var(--space-3);
  font-size: 1.25rem;
}

/* Pagination */
.pagination {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: var(--space-6);
}

.page-numbers {
  display: flex;
  gap: var(--space-2);
}

.page-number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.page-number:hover {
  background-color: var(--color-gray-100);
}

.page-number.active {
  background-color: var(--color-primary);
  color: white;
}

/* Empty States */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  text-align: center;
}

.empty-icon {
  font-size: 3rem;
  color: var(--color-gray-400);
  margin-bottom: var(--space-4);
}

.empty-state h3 {
  margin-bottom: var(--space-2);
  color: var(--color-gray-700);
}

.empty-state p {
  max-width: 400px;
  color: var(--color-gray-500);
}