.ui-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: var(--control-height-md);
  gap: var(--space-2);
  padding: 0 var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-family: var(--font-family-sans);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  user-select: none;
  transition:
    background-color var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast),
    opacity var(--transition-fast),
    transform var(--transition-fast);
}

.ui-button:hover:not(:disabled):not([aria-disabled="true"]) {
  text-decoration: none;
}

.ui-button:focus {
  outline: none;
}

.ui-button:focus-visible {
  box-shadow: var(--focus-ring);
}

.ui-button:active:not(:disabled):not([aria-disabled="true"]) {
  transform: translateY(1px);
}

.ui-button:disabled,
.ui-button[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.6;
}

.ui-button--primary {
  background: var(--brand-industrial);
  border-color: var(--brand-industrial);
  color: var(--brand-industrial-contrast);
}

.ui-button--primary:hover:not(:disabled):not([aria-disabled="true"]) {
  background: var(--brand-industrial-hover);
  border-color: var(--brand-industrial-hover);
}

.ui-button--primary:active:not(:disabled):not([aria-disabled="true"]) {
  background: var(--brand-industrial-active);
  border-color: var(--brand-industrial-active);
}

.ui-button--secondary {
  background: var(--surface-panel);
  border-color: var(--border-strong);
  color: var(--text-default);
}

.ui-button--secondary:hover:not(:disabled):not([aria-disabled="true"]) {
  background: var(--surface-hover);
  border-color: var(--border-strong);
}

.ui-button--secondary:active:not(:disabled):not([aria-disabled="true"]) {
  background: var(--surface-subtle);
}

.ui-button--destructive {
  background: var(--state-error);
  border-color: var(--state-error);
  color: var(--text-inverse);
}

.ui-button--destructive:hover:not(:disabled):not([aria-disabled="true"]) {
  filter: brightness(0.92);
}

.ui-button--destructive:active:not(:disabled):not([aria-disabled="true"]) {
  filter: brightness(0.84);
}

.ui-button--ghost {
  background: transparent;
  border-color: transparent;
  color: var(--text-default);
}

.ui-button--ghost:hover:not(:disabled):not([aria-disabled="true"]) {
  background: var(--surface-hover);
}

.ui-button--ghost:active:not(:disabled):not([aria-disabled="true"]) {
  background: var(--surface-subtle);
}

.ui-button--icon {
  width: var(--control-height-md);
  padding: 0;
}

.ui-button--sm {
  min-height: var(--control-height-sm);
  padding: 0 var(--space-3);
  font-size: var(--font-size-xs);
}

.ui-button--lg {
  min-height: var(--control-height-lg);
  padding: 0 var(--space-5);
  font-size: var(--font-size-md);
}

.ui-button--block {
  width: 100%;
}

.ui-button__spinner {
  width: 1rem;
  height: 1rem;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: ui-button-spin 700ms linear infinite;
}

.ui-button[data-loading="true"] {
  pointer-events: none;
}

.ui-button[data-loading="true"] .ui-button__label {
  opacity: 0.9;
}

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

@media (prefers-reduced-motion: reduce) {
  .ui-button {
    transition: none;
  }

  .ui-button__spinner {
    animation-duration: 1200ms;
  }
}