.c42-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font: inherit;
  font-weight: 500;
  line-height: 1.25;
  padding: 0.5rem 0.75rem;
  border: 1px solid transparent;
  border-radius: var(--c42-radius-sm, 0.5rem);
  cursor: pointer;
  transition:
    background-color var(--c42-transition, 200ms ease),
    color var(--c42-transition, 200ms ease),
    border-color var(--c42-transition, 200ms ease);
}

.c42-button:focus-visible {
  outline: 2px solid var(--c42-color-accent, #4f46e5);
  outline-offset: 2px;
}

.c42-button:disabled,
.c42-button[aria-disabled='true'] {
  opacity: 0.5;
  cursor: not-allowed;
}

/* sizes */
.c42-button[data-size='sm'] {
  padding: 0.375rem 0.625rem;
  font-size: 0.875rem;
}

.c42-button[data-size='lg'] {
  padding: 0.75rem 1.25rem;
  font-size: 1.125rem;
}

/* variants (primary is the default) */
.c42-button,
.c42-button[data-variant='primary'] {
  background: var(--c42-color-accent, #4f46e5);
  color: var(--c42-color-on-accent, #fff);
}

.c42-button:hover,
.c42-button[data-variant='primary']:hover {
  background: var(--c42-color-accent-strong, #4338ca);
}

.c42-button[data-variant='secondary'] {
  background: var(--c42-color-surface, #f9fafb);
  color: var(--c42-color-fg, #1f2937);
  border-color: var(--c42-color-border, #e5e7eb);
}

.c42-button[data-variant='outline'] {
  background: transparent;
  color: var(--c42-color-accent, #4f46e5);
  border-color: var(--c42-color-accent, #4f46e5);
}

.c42-button[data-variant='ghost'] {
  background: transparent;
  color: var(--c42-color-accent, #4f46e5);
}

.c42-button[data-variant='ghost']:hover {
  background: var(--c42-color-surface, #f9fafb);
}

.c42-button[data-variant='danger'] {
  background: var(--c42-color-danger, #dc2626);
  color: var(--c42-color-on-danger, #fff);
}

/* icon sizing inside any button */
.c42-button svg {
  width: 1.25em;
  height: 1.25em;
  flex: none;
}

/* icon-only (square) button */
.c42-button[data-icon] {
  padding: 0.5rem;
  aspect-ratio: 1 / 1;
}

.c42-button[data-icon][data-size='sm'] {
  padding: 0.375rem;
}

.c42-button[data-icon][data-size='lg'] {
  padding: 0.75rem;
}

/* visually-hidden label for icon-only buttons */
.c42-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;
}