/* KRS Portal Design System */

/* ===== Design Tokens ===== */
:root {
  /* Primary Colors */
  --color-primary-50: #eff6ff;
  --color-primary-100: #dbeafe;
  --color-primary-200: #bfdbfe;
  --color-primary-500: #3b82f6;
  --color-primary-600: #2563eb;
  --color-primary-700: #1d4ed8;

  /* Semantic Colors */
  --color-success-50: #f0fdf4;
  --color-success-500: #22c55e;
  --color-success-600: #16a34a;
  --color-success-700: #15803d;

  --color-warning-50: #fffbeb;
  --color-warning-500: #f59e0b;
  --color-warning-600: #d97706;

  --color-error-50: #fef2f2;
  --color-error-500: #ef4444;
  --color-error-600: #dc2626;
  --color-error-700: #b91c1c;

  --color-info-50: #eff6ff;
  --color-info-500: #3b82f6;
  --color-info-600: #2563eb;

  /* Neutral Colors */
  --color-neutral-50: #f8fafc;
  --color-neutral-100: #f1f5f9;
  --color-neutral-200: #e2e8f0;
  --color-neutral-300: #cbd5e1;
  --color-neutral-400: #94a3b8;
  --color-neutral-500: #64748b;
  --color-neutral-600: #475569;
  --color-neutral-700: #334155;
  --color-neutral-800: #1e293b;
  --color-neutral-900: #0f172a;

  /* Typography */
  --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;

  /* Spacing */
  --spacing-1: 0.25rem;
  --spacing-2: 0.5rem;
  --spacing-3: 0.75rem;
  --spacing-4: 1rem;
  --spacing-6: 1.5rem;
  --spacing-8: 2rem;

  /* 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 -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
}

/* ===== Base Styles ===== */
body {
  font-family: var(--font-family);
}

/* ===== Toast Container ===== */
#toast-container {
  position: fixed;
  top: 1rem;
  right: 1rem;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  pointer-events: none;
  max-width: 400px;
}

.toast {
  pointer-events: auto;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.875rem 1.25rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  font-size: var(--font-size-sm);
  font-weight: 500;
  animation: toastEnter var(--transition-slow) ease forwards;
  backdrop-filter: blur(8px);
  cursor: pointer;
}

.toast-message {
  flex: 1;
  min-width: 0;
}

.toast-close {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.75rem;
  height: 1.75rem;
  border: 0;
  border-radius: 9999px;
  background: transparent;
  color: currentColor;
  opacity: 0.72;
  cursor: pointer;
  transition: opacity var(--transition-fast), background-color var(--transition-fast);
}

.toast-close:hover {
  opacity: 1;
  background-color: rgba(255, 255, 255, 0.45);
}

.toast-success {
  background-color: var(--color-success-50);
  border: 1px solid var(--color-success-500);
  color: var(--color-success-700);
}

.toast-error {
  background-color: var(--color-error-50);
  border: 1px solid var(--color-error-500);
  color: var(--color-error-700);
}

.toast-warning {
  background-color: var(--color-warning-50);
  border: 1px solid var(--color-warning-500);
  color: var(--color-warning-600);
}

.toast-info {
  background-color: var(--color-info-50);
  border: 1px solid var(--color-info-500);
  color: var(--color-info-600);
}

.toast-exit {
  animation: toastExit var(--transition-base) ease forwards;
}

@keyframes toastEnter {
  from {
    opacity: 0;
    transform: translateX(100%) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
}

@keyframes toastExit {
  from {
    opacity: 1;
    transform: translateX(0) scale(1);
  }
  to {
    opacity: 0;
    transform: translateX(100%) scale(0.95);
  }
}

/* ===== Modal Overlay ===== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9998;
  padding: 1rem;
  animation: modalFadeIn var(--transition-base) ease;
}

.modal-content {
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 28rem;
  width: 100%;
  padding: 1.5rem;
  animation: modalScaleIn var(--transition-base) ease;
}

.modal-overlay-exit {
  animation: modalFadeOut var(--transition-fast) ease forwards;
}

.modal-overlay-exit .modal-content {
  animation: modalScaleOut var(--transition-fast) ease forwards;
}

@keyframes modalFadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes modalFadeOut {
  from { opacity: 1; }
  to { opacity: 0; }
}

@keyframes modalScaleIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}

@keyframes modalScaleOut {
  from { opacity: 1; transform: scale(1) translateY(0); }
  to { opacity: 0; transform: scale(0.95) translateY(10px); }
}

/* ===== Skeleton Loading ===== */
.skeleton {
  background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
  background-size: 200% 100%;
  animation: skeletonPulse 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

.skeleton-card {
  height: 120px;
}

.skeleton-row {
  height: 3rem;
  margin-bottom: 0.5rem;
}

.skeleton-text {
  height: 1rem;
  margin-bottom: 0.5rem;
}

.skeleton-text-sm {
  height: 0.75rem;
  width: 60%;
  margin-bottom: 0.5rem;
}

@keyframes skeletonPulse {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ===== Page Animations ===== */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
  animation: fadeIn var(--transition-slow) ease forwards;
}

.animate-slide-up {
  animation: slideUp var(--transition-slow) ease forwards;
}

/* ===== Mobile Menu ===== */
.mobile-menu {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow) ease;
}

.mobile-menu.open {
  max-height: 500px;
}

/* ===== Dark Mode Preparation ===== */
@media (prefers-color-scheme: dark) {
  :root {
    --color-neutral-50: #0f172a;
    --color-neutral-100: #1e293b;
    --color-neutral-200: #334155;
    --color-neutral-700: #e2e8f0;
    --color-neutral-800: #f1f5f9;
    --color-neutral-900: #f8fafc;
  }
}