/* Checkbox and radio: native inputs restyled (keyboard and form behaviour stay native).
   <label class="ui-choice"><input type="checkbox" class="ui-checkbox"> <span class="ui-choice__text">
     <span class="ui-choice__label">…</span><span class="ui-choice__hint">…</span></span></label>
   .ui-radio for type="radio". :indeterminate is supported. .ui-choice is a 44 px row; the input itself
   is a 44 px touch target with a 20 px visible box.
   .ui-choice--card draws the row as a selectable card (C1 consent option). */

@layer reset, tokens, base, layout, components, apps, utilities;

@layer components {
  .ui-choice {
    display: flex;
    align-items: flex-start;
    gap: var(--space-3);
    min-height: var(--touch-target);
    padding-block: var(--space-2-5);
    color: var(--color-text);
    font-size: var(--font-size-base);
    line-height: var(--line-height-snug);
    cursor: pointer;
  }

  .ui-choice:has(:disabled) {
    color: var(--color-text-disabled);
    cursor: not-allowed;
  }

  .ui-choice__text {
    display: flex;
    flex-direction: column;
    gap: var(--space-0-5);
    min-width: 0;
  }

  .ui-choice__label {
    font-weight: var(--font-weight-semibold);
  }

  .ui-choice__hint {
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
  }

  .ui-choice:has(:disabled) .ui-choice__hint {
    color: var(--color-text-disabled);
  }

  .ui-choice--card {
    padding: var(--space-3) var(--space-3-5);
    border: var(--border-width) solid var(--color-divider);
    border-radius: var(--radius-2xl);
    background: var(--color-bg-inset);
    transition: background-color var(--duration-fast) var(--ease-standard),
      border-color var(--duration-fast) var(--ease-standard);
  }

  .ui-choice--card:has(:checked) {
    border-color: var(--color-accent-border);
    background: var(--color-accent-soft);
  }

  /* The input itself is the 44 px touch target (also when it stands alone, outside a .ui-choice row);
     the visible 20 px box is ::before and the negative margins keep a 20 px footprint in the layout. */
  .ui-checkbox,
  .ui-radio {
    --_border: var(--color-border-hover);
    --_fill: var(--color-bg-inset);
    --_box-radius: var(--radius-sm);

    position: relative;
    display: inline-grid;
    place-items: center;
    flex: none;
    width: var(--touch-target);
    height: var(--touch-target);
    margin: calc((20px - var(--touch-target)) / 2 + 1px) calc((20px - var(--touch-target)) / 2) calc((20px - var(--touch-target)) / 2);
    padding: 0;
    border: 0;
    border-radius: var(--radius-md);
    background: transparent;
    appearance: none;
    cursor: pointer;
  }

  .ui-radio {
    --_box-radius: var(--radius-round);
  }

  .ui-checkbox::before,
  .ui-radio::before {
    content: "";
    grid-area: 1 / 1;
    width: 20px;
    height: 20px;
    border: 2px solid var(--_border);
    border-radius: var(--_box-radius);
    background: var(--_fill);
    transition: background-color var(--duration-fast) var(--ease-standard),
      border-color var(--duration-fast) var(--ease-standard);
  }

  .ui-checkbox::after {
    content: "";
    grid-area: 1 / 1;
    width: 5px;
    height: 10px;
    margin-top: -2px;
    border-right: 2px solid var(--color-on-accent);
    border-bottom: 2px solid var(--color-on-accent);
    transform: rotate(45deg) scale(0);
    transition: transform var(--duration-fast) var(--ease-out);
  }

  .ui-radio::after {
    content: "";
    grid-area: 1 / 1;
    width: 8px;
    height: 8px;
    border-radius: var(--radius-round);
    background: var(--color-on-accent);
    transform: scale(0);
    transition: transform var(--duration-fast) var(--ease-out);
  }

  @media (hover: hover) {
    .ui-choice:hover .ui-checkbox:not(:disabled, :checked),
    .ui-choice:hover .ui-radio:not(:disabled, :checked),
    .ui-checkbox:hover:not(:disabled, :checked),
    .ui-radio:hover:not(:disabled, :checked) {
      --_border: var(--color-accent);
    }
  }

  .ui-checkbox:checked,
  .ui-radio:checked,
  .ui-checkbox:indeterminate {
    --_border: var(--color-accent);
    --_fill: var(--color-accent);
  }

  .ui-checkbox:checked::after,
  .ui-radio:checked::after {
    transform: rotate(45deg) scale(1);
  }

  .ui-radio:checked::after {
    transform: scale(1);
  }

  .ui-checkbox:indeterminate::after {
    width: 10px;
    height: 0;
    margin-top: 0;
    border-right: 0;
    transform: none;
  }

  /* The focus ring goes around the visible box, not the touch area. */
  .ui-checkbox:focus-visible,
  .ui-radio:focus-visible {
    outline: none;
  }

  .ui-checkbox:focus-visible::before,
  .ui-radio:focus-visible::before,
  .ui-checkbox.is-focus-visible::before,
  .ui-radio.is-focus-visible::before {
    outline: var(--focus-ring-width) solid var(--color-focus-ring);
    outline-offset: var(--focus-ring-offset);
  }

  .ui-checkbox:disabled,
  .ui-radio:disabled {
    --_border: var(--color-border);
    --_fill: var(--color-bg-disabled);
    cursor: not-allowed;
  }

  .ui-checkbox:disabled:checked::after,
  .ui-radio:disabled:checked::after {
    border-color: var(--color-text-disabled);
  }

  .ui-radio:disabled:checked::after {
    background: var(--color-text-disabled);
  }

  .ui-checkbox[aria-invalid="true"],
  .ui-radio[aria-invalid="true"] {
    --_border: var(--color-danger-text);
  }

  @media (forced-colors: active) {
    .ui-checkbox,
    .ui-radio {
      width: 20px;
      height: 20px;
      margin: 1px 0 0;
      appearance: auto;
    }

    .ui-checkbox::before,
    .ui-radio::before,
    .ui-checkbox::after,
    .ui-radio::after {
      content: none;
    }
  }
}