/* Buttons
 * Uses color-mix() for derived hover/active states from a single color.
 * Pattern from Fizzy: one --btn-color in, four states out.
 */

.btn {
  --btn-color: var(--color-link);
  --btn-bg: var(--btn-color);
  --btn-text: white;
  --btn-border-radius: 6px;

  display: inline-flex;
  align-items: center;
  gap: var(--inline-space-s);
  padding: 0.5em 1.25em;
  font: inherit;
  font-weight: 500;
  line-height: 1.25;
  color: var(--btn-text);
  background: var(--btn-bg);
  border: 1px solid transparent;
  border-radius: var(--btn-border-radius);
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: filter 100ms ease;

  &:hover {
    filter: brightness(1.1);
  }

  &:active {
    filter: brightness(0.95);
  }

  &:focus-visible {
    outline: 2px solid var(--btn-color);
    outline-offset: 2px;
  }

  &:disabled, &[aria-disabled="true"] {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
  }
}

/* Outline variant */
.btn--outline {
  --btn-text: var(--btn-color);
  --btn-bg: transparent;
  border-color: var(--btn-color);

  &:hover {
    --btn-bg: color-mix(in srgb, var(--btn-color) 8%, transparent);
    filter: none;
  }
}

/* Ghost variant (no border) */
.btn--ghost {
  --btn-text: var(--btn-color);
  --btn-bg: transparent;

  &:hover {
    --btn-bg: color-mix(in srgb, var(--btn-color) 8%, transparent);
    filter: none;
  }
}

/* Danger variant */
.btn--danger {
  --btn-color: var(--color-negative);
}

/* Small variant */
.btn--sm {
  padding: 0.3em 0.75em;
  font-size: 0.875rem;
}

/* Circle icon button (icon + screen-reader text) */
.btn:where(:has(.visually-hidden):has(img)),
.btn:where(:has(.visually-hidden):has(svg)) {
  --btn-border-radius: 50%;
  aspect-ratio: 1;
  padding: 0.5em;
}