.u-flex {
  display: flex;
}
.u-inline-flex {
  display: inline-flex;
}
.u-grid {
  display: grid;
}
.u-hidden {
  display: none !important;
}
.u-sr-only,
.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;
}
.u-gap-2 {
  gap: 0.5rem;
}
.u-gap-3 {
  gap: 0.75rem;
}
.u-px-2 {
  padding-left: 0.5rem;
  padding-right: 0.5rem;
}
.u-py-2 {
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}
.u-rounded {
  border-radius: var(--radius-md);
}
.u-border {
  border: 1px solid var(--border-color);
}
.u-text-muted {
  color: var(--text-light);
}
.u-bg-surface-1 {
  background: var(--surface-1);
}
.u-bg-surface-2 {
  background: var(--surface-2);
}
.u-shadow-card {
  box-shadow: var(--shadow-card);
}

.u-justify-between {
  justify-content: space-between;
}
.u-items-center {
  align-items: center;
}
.u-flex-wrap {
  flex-wrap: wrap;
}
.u-gap-1 {
  gap: 0.25rem;
}
.u-gap-4 {
  gap: 1rem;
}
.u-ml-auto {
  margin-left: auto;
}
.u-pos-rel {
  position: relative;
}
.u-z1 {
  z-index: var(--z1, 1);
}
.u-z2 {
  z-index: var(--z2, 2);
}
.u-minw-180 {
  min-width: 180px;
}
.u-text-right {
  text-align: right;
}

/* ==========================================================================
   Loading Overlay Components
   ========================================================================== */

.loading-blocker {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 99998;
  display: none;
  backdrop-filter: blur(3px);
  cursor: wait;
}

.loading-blocker-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  color: white;
  font-size: 18px;
  font-weight: 600;
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.55);
}

.loading-toast {
  position: fixed;
  top: var(--spacing-6, 24px);
  right: var(--spacing-6, 24px);
  z-index: 99999;
  background: rgba(255, 255, 255, 0.98);
  border: 2px solid var(--color-gray-200, #e5e7eb);
  border-radius: var(--radius-xl, 20px);
  padding: var(--spacing-6, 24px) var(--spacing-8, 28px);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.35);
  min-width: 280px;
  max-width: min(90vw, 380px);
  display: none;
  backdrop-filter: blur(14px);
}

.loading-toast-header {
  display: flex;
  align-items: center;
  gap: var(--spacing-4, 16px);
  margin-bottom: var(--spacing-4, 16px);
}

.loading-toast-title {
  font-weight: 600;
  color: var(--color-gray-900, #111827);
  font-size: 18px;
  letter-spacing: 0.01em;
}

.loading-progress-track {
  background: var(--color-gray-100, #f3f4f6);
  border-radius: var(--radius-full, 999px);
  height: 10px;
  overflow: hidden;
  margin-bottom: var(--spacing-3, 12px);
}

.loading-progress-bar {
  background: linear-gradient(90deg, #4f46e5, #7c3aed);
  height: 100%;
  width: 0%;
  transition: width 0.3s ease;
}

.loading-progress-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 14px;
  color: var(--color-gray-600, #4b5563);
  font-weight: 500;
}

.loading-spinner {
  width: 32px;
  height: 32px;
  border: 4px solid var(--color-gray-200, #e5e7eb);
  border-top-color: #4f46e5;
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

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

/* ==========================================================================
   Modal Components
   ========================================================================== */

.modal-close-btn {
  border: none;
  background: transparent;
  cursor: pointer;
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--color-gray-500, #6b7280);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm, 4px);
  flex-shrink: 0;
  transition: background-color var(--transition-fast, 150ms);
}

.modal-close-btn:hover {
  background: var(--color-gray-100, #f3f4f6);
}

.modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-4, 1rem);
}

.modal-title-sm {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: var(--spacing-4, 1rem);
}

.modal-section-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-4, 1rem);
  color: var(--color-gray-700, #374151);
}

.modal-section-title-sm {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: var(--spacing-3, 0.75rem);
}

/* ==========================================================================
   Form Components
   ========================================================================== */

.form-label {
  display: block;
  font-weight: 500;
  margin-bottom: var(--spacing-2, 0.5rem);
}

.form-label-inline {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2, 0.5rem);
  font-size: 0.9rem;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-4, 1rem);
}

@media (max-width: 640px) {
  .form-grid {
    grid-template-columns: 1fr;
  }
}

/* ==========================================================================
   Stat Cards
   ========================================================================== */

.stat-card-grid {
  display: grid;
  gap: var(--spacing-3, 12px);
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.stat-card {
  background: var(--color-gray-50, #f9fafb);
  border: 1px solid var(--color-gray-200, #e5e7eb);
  border-radius: var(--radius-md, 8px);
  padding: var(--spacing-3, 12px);
}

.stat-card-label {
  font-size: 0.75rem;
  color: var(--color-gray-500, #6b7280);
}

.stat-card-value {
  font-size: 1.25rem;
  font-weight: 700;
}

/* ==========================================================================
   Additional Utilities
   ========================================================================== */

/* Text sizes */
.u-text-xs {
  font-size: var(--text-xs, 0.75rem);
}
.u-text-sm {
  font-size: var(--text-sm, 0.875rem);
}
.u-text-base {
  font-size: var(--text-base, 1rem);
}
.u-text-lg {
  font-size: var(--text-lg, 1.125rem);
}
.u-text-xl {
  font-size: var(--text-xl, 1.25rem);
}

/* Font weights */
.u-font-medium {
  font-weight: 500;
}
.u-font-semibold {
  font-weight: 600;
}
.u-font-bold {
  font-weight: 700;
}

/* Text colors */
.u-text-primary {
  color: var(--color-gray-900, #111827);
}
.u-text-secondary {
  color: var(--color-gray-600, #4b5563);
}
.u-text-muted {
  color: var(--color-gray-500, #6b7280);
}

/* Flexbox */
.u-flex-col {
  flex-direction: column;
}
.u-justify-center {
  justify-content: center;
}
.u-justify-end {
  justify-content: flex-end;
}

/* Spacing */
.u-mb-2 {
  margin-bottom: 0.5rem;
}
.u-mb-3 {
  margin-bottom: 0.75rem;
}
.u-mb-4 {
  margin-bottom: 1rem;
}
.u-mt-4 {
  margin-top: 1rem;
}
.u-p-3 {
  padding: 0.75rem;
}
.u-p-4 {
  padding: 1rem;
}

/* Misc */
.u-truncate {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.u-w-full {
  width: 100%;
}

.u-border-collapse {
  border-collapse: collapse;
}