@layer components {
  /* Inline marker comments on a short response (issue #1049): highlights in the text,
     cards in a margin beside it. Below 40rem the margin stacks under the text as a
     numbered list and each highlight shows its number. */
  .response-comments {
    container-type: inline-size;
    position: relative;
  }

  .response-comments__margin {
    list-style: none;
    margin: 0;
    padding: 0;
  }

  @container (min-width: 40rem) {
    .response-comments {
      column-gap: var(--space-8);
      display: grid;
      grid-template-columns: minmax(0, 1fr) 16rem;
    }

    .response-comments__margin { position: relative; }

    .response-comment {
      inset-inline: 0;
      position: absolute;
      transition: inset-block-start 150ms ease, translate 120ms ease;
    }

    .response-comment--active { translate: -0.375rem 0; }
    .response-comment__number { display: none; }
  }

  @container (max-width: 39.999rem) {
    .response-comments__margin {
      display: grid;
      gap: var(--space-4);
      margin-block-start: var(--space-6);
    }

    mark.response-comment-mark[data-number]::after {
      color: var(--color-warning-text);
      content: attr(data-number);
      font-size: 0.7em;
      font-weight: 700;
      margin-inline-start: 0.1em;
      vertical-align: super;
    }
  }

  mark.response-comment-mark {
    background: oklch(var(--oklch-accent) / 0.35);
    border-block-end: 2px solid var(--color-accent);
    border-radius: var(--radius-sm);
    color: inherit;
    cursor: pointer;
  }

  /* Active is shown by an outline as well as colour, so it doesn't rely on colour alone. */
  mark.response-comment-mark--active {
    background: oklch(var(--oklch-accent) / 0.6);
    outline: 2px solid var(--color-accent);
    outline-offset: 1px;
  }

  .response-comment {
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    display: grid;
    font-size: 0.8125rem;
    gap: var(--space-3);
    padding: var(--space-5) var(--space-6);
  }

  .response-comment:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 2px;
  }

  .response-comment--active { border-color: var(--color-accent); }
  .response-comment--draft { border: 1px dashed var(--color-focus); }

  .response-comment__meta {
    color: var(--color-text-muted);
    display: flex;
    font-size: 0.75rem;
    gap: var(--space-2);
  }

  .response-comment__author { color: var(--color-text-secondary); font-weight: 600; }
  .response-comment__number { color: var(--color-warning-text); font-weight: 700; }

  .response-comment__quote {
    border-inline-start: 2px solid var(--color-accent);
    color: var(--color-text-secondary);
    font-style: italic;
    margin: 0;
    overflow: hidden;
    padding-inline-start: var(--space-4);
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .response-comment__body { margin: 0; white-space: pre-wrap; }

  .response-comment__orphan {
    background: var(--color-warning-surface);
    border-radius: var(--radius-sm);
    color: var(--color-warning-text);
    font-size: 0.6875rem;
    font-weight: 600;
    justify-self: start;
    padding: 0 var(--space-3);
  }

  .response-comment__actions { align-items: center; display: flex; gap: var(--space-6); }

  .response-comment .btn-link {
    background: none;
    border: 0;
    color: var(--color-primary);
    cursor: pointer;
    font: inherit;
    font-size: 0.75rem;
    padding: 0;
  }

  .response-comment .btn-link:hover { text-decoration: underline; }

  .response-comment--editing > .response-comment__body,
  .response-comment--editing > .response-comment__actions { display: none; }

  .response-comment__editor { display: grid; gap: var(--space-3); }

  .response-comment__input {
    background: var(--color-surface);
    border: 1px solid var(--color-focus);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font: inherit;
    inline-size: 100%;
    padding: var(--space-3) var(--space-4);
    resize: vertical;
  }

  .response-comment__hint { color: var(--color-text-muted); font-size: 0.6875rem; margin: 0; }
  .response-comment__error { color: var(--color-danger-text); font-size: 0.75rem; margin: 0; }

  .response-comments__add {
    background: var(--color-primary);
    border: 0;
    border-radius: var(--radius-sm);
    box-shadow: 0 4px 12px oklch(0% 0 0 / 20%);
    color: var(--color-text-on-primary);
    cursor: pointer;
    font-size: 0.75rem;
    font-weight: 600;
    padding: var(--space-2) var(--space-5);
    position: absolute;
    z-index: 5;
  }

  .response-comments__add:disabled { cursor: not-allowed; opacity: 0.75; }

  @media (prefers-reduced-motion: reduce) {
    .response-comment { transition: none; }
  }
}