Radio

@layer components.root {
  label.ui-radio {
    --_input-size: 1.125rem;
    --_indicator-size: 50%;

    align-items: center;
    color: var(--text-primary);
    cursor: pointer;
    display: inline-grid;
    gap: 0 var(--size-2);
    grid-auto-columns: auto;
    grid-auto-flow: column;
    inline-size: fit-content;
    line-height: 1.5;
    transform: translateZ(0);
    user-select: none;

    /* Disabled */
    &:has([disabled]) {
      cursor: not-allowed;
      opacity: 0.64;
      user-select: none;

      input {
        cursor: not-allowed;
      }
    }

    /* Required dot */
    &:has(:invalid) {
      .ui-label:after {
        color: var(--red);
        content: "*";
        inset: 0 -0.25ex auto auto;
        position: absolute;
      }
    }

    /* Label */
    .ui-label {
      color: var(--text-primary);
      font-size: var(--font-size-05);
      grid-column: 2;
      grid-row: 1;
      padding-inline: 0 1ex;
      position: relative;
    }

    /* End text */
    :where(.ui-end-text) {
      color: var(--text-muted);
      font-size: var(--font-size-0);
      grid-column: 2;
      grid-row: 2;
      line-height: 1.5;
      z-index: 1;
    }

    /* Stacked layout */
    &.ui-stack {
      grid-auto-columns: unset;
      justify-items: center;

      .ui-label {
        grid-column: 1/-1;
        grid-row: 2;
        margin-block-start: var(--size-1);
        padding-inline: 1ex;

        /* Required dot */
        &::after {
          inset: 0 -0.25ex auto auto;
        }
      }

      .ui-end-text {
        grid-column: 1/-1;
        grid-row: 3;
      }
    }

    /* Input */
    input[type="radio"] {
      appearance: none;
      aspect-ratio: 1;
      background-color: var(--surface-default);
      block-size: var(--_input-size);
      border: 1px solid var(--field-border-color);
      border-radius: var(--radius-round);
      box-sizing: border-box;
      cursor: pointer;
      display: grid;
      inline-size: var(--_input-size);
      margin: 0;
      padding: 0;
      place-items: center;
      position: relative;

      &:checked {
        background-color: var(--primary);
        border-color: var(--primary);
      }

      /* Dot */
      &::after {
        background-color: var(--primary-contrast);
        block-size: var(--_indicator-size);
        border-radius: var(--radius-round);
        content: "";
        inline-size: var(--_indicator-size);
        margin: auto;
        opacity: 0;
      }

      &:checked::after {
        opacity: 1;
      }

      &::before {
        --highlight-size: 175%;
      }
    }

    /* Sizes */
    &.ui-small {
      input[type="radio"] {
        --_input-size: var(--size-3);
      }
    }

    &.ui-large {
      input[type="radio"] {
        --_input-size: var(--size-4);
      }
    }

    /* Validation */
    &[data-invalid],
    &:has(:user-invalid) {
      --primary: var(--critical);

      :where(.ui-end-text) {
        color: var(--critical);
      }
    }

    /* Touch devices */
    @media (pointer: coarse) {
      input[type="radio"] {
        block-size: var(--size-4);
        inline-size: var(--size-4);
      }
    }

    @media (forced-colors: active) {
      input[type="radio"] {
        border: 1px solid CanvasText;

        &:checked {
          background-color: SelectedItem;
          border-color: SelectedItem;

          &::after {
            background-color: SelectedItemText;
          }
        }
      }
    }
  }
}

@layer components.extended {
  /* Form */
  :where(.ui-form) {
    display: grid;
    gap: var(--size-8);

    hr {
      margin-block: 0;
    }
  }

  /* Fieldset */
  :where(.ui-fieldset) {
    all: unset;
    border: 0;
    border-radius: 0;
    display: grid;
    gap: var(--size-1);
    margin: 0;
    min-inline-size: 0;
    padding: 0;

    /* Legend */
    :where(legend, .ui-legend) {
      all: unset;
      color: var(--text-primary);
      font-weight: 600;
      margin-block-end: var(--size-3);
      padding: 0;

      &:has(+ :where(.ui-field-description)) {
        margin-block-end: 0;
      }
    }

    /* Field description / supporting text */
    :where(.ui-field-description) {
      color: var(--text-muted);
      font-size: var(--font-size-05);
      line-height: var(--font-lineheight-3);

      &:has(+ *) {
        margin-block-end: var(--size-3);
      }
    }

    /* End text */
    :where(.ui-end-text) {
      color: var(--text-muted);
      font-size: var(--font-size-0);
      line-height: var(--font-lineheight-3);
    }

    &:has(.ui-text-field.ui-row) {
      row-gap: var(--size-7);
    }

    /* Disabled */
    &[disabled] {
      opacity: 0.64;
      user-select: none;

      input,
      label,
      .ui-label {
        cursor: not-allowed;
      }
    }

    /* Error / validation */
    &[data-invalid] {
      :where(.ui-end-text) {
        color: var(--critical);
      }

      :where(.ui-checkbox, .ui-radio, .ui-switch) {
        --primary: var(--critical);

        :where(.ui-end-text) {
          color: var(--critical);
        }
      }

      :where(.ui-switch) {
        input {
          border-radius: var(--radius-round);
          outline: 2px solid var(--critical);
        }
      }
    }

    /* Required */
    &:has(:invalid) {
      :where(legend, .ui-legend) {
        padding-inline-end: 1ex;
        position: relative;

        &::after {
          color: var(--red);
          content: "*";
          inset: 0 -0.25ex auto auto;
          position: absolute;
        }
      }
    }
  }

  /* Field group */
  :where(.ui-field-group) {
    display: flex;
    flex-direction: column;
    gap: var(--size-4);

    /* If it only has checkboxes, radios, or switches */
    &:has(> :where(.ui-checkbox, .ui-radio, .ui-switch)):not(
        :has(> :not(.ui-checkbox, .ui-radio, .ui-switch))
      ) {
      gap: var(--size-2);
    }

    /* If it only has buttons */
    &:has(.ui-button):not(:has(*:not(.ui-button))) {
      align-items: center;
      flex-direction: row;
      gap: var(--size-2);

      /* If it's not preceded by an hr */
      &:not(hr + &) {
        margin-block-start: var(--size-4);
      }
    }

    & + & {
      margin-block-start: var(--size-5);
    }

    /* Directions */
    &.ui-row {
      flex-direction: row;
      flex-wrap: wrap;

      &:has(> :where(.ui-checkbox, .ui-radio, .ui-switch)) {
        gap: var(--size-4);
      }
    }
  }
}