/* Buttons: primary, secondary, ghost, danger, icon-only; loading state via aria-busy. */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  min-height: var(--touch-target);
  padding: 0 var(--space-4);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font: inherit;
  font-weight: var(--weight-medium);
  line-height: 1.2;
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out),
    color var(--duration-fast) var(--ease-out);
}

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

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

.btn--secondary {
  background: var(--color-surface);
  border-color: var(--color-border-strong);
  color: var(--color-text);
}

.btn--secondary:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
}

.btn--ghost:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}

.btn--danger {
  background: var(--color-danger);
  color: var(--color-on-danger);
}

.btn--danger:hover {
  background: var(--color-danger-hover);
  color: var(--color-on-danger);
}

.btn--icon {
  width: var(--touch-target);
  padding: 0;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.55;
  cursor: not-allowed;
}

.btn[aria-busy="true"] {
  pointer-events: none;
}

.btn[aria-busy="true"]::before {
  content: "";
  width: 1em;
  height: 1em;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: btn-spin 0.8s linear infinite;
}

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

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

/* Compact text for buttons inside table rows; the touch target stays 44px tall. */
.btn--small {
  padding: 0 var(--space-3);
  font-size: var(--text-sm);
}