multica/packages/views/editor/styles/prose.css

/*
 * Rich text prose typography.
 *
 * Design tier: "Compact" (same tier as Linear, Slack). Optimized for
 * short-form content (issue descriptions, comments) that users scan, not
 * long-form reading.
 *
 * Typography values benchmarked against (April 2026):
 *   - github-markdown-css (GitHub's markdown renderer)
 *   - @tailwindcss/typography prose-sm preset
 *   - Linear's editor (Tiptap-based, 14px body)
 *
 * Key decisions:
 *   Body: 14px (text-sm), line-height 1.625 (between GitHub 1.5 and Tailwind 1.714)
 *   Headings: h1=22px (1.57x), h2=18px (1.29x), h3=15px (1.07x) — compact but
 *     with clear hierarchy. Previous h3 was 14px (same as body = no differentiation).
 *   Paragraph spacing: 10px (was 8px; GitHub uses 10px, Tailwind prose-sm uses 16px)
 *   List indent: 20px for ul (was 16px; standard is 22-32px)
 *   Code block margin: 12px (was 8px; gives breathing room between code and prose)
 *   Blockquote border: 3px (was 2px; GitHub/Tailwind both use 4px)
 *   Links: var(--brand) blue with 40% opacity underline (was var(--primary) near-black)
 *
 * Inline elements (mention cards, inline code) that exceed line-height:
 *   The browser auto-expands the line box for lines containing taller inline
 *   elements. Controlled via vertical-align on [data-node-view-wrapper] and
 *   box-decoration-break: clone on inline code.
 */

/* Headings — compact but with clear visual hierarchy */
.rich-text-editor h1 {
  font-size: 1.375rem;
  font-weight: 700;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  line-height: 1.3;
  letter-spacing: -0.01em;
}

.rich-text-editor h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
  line-height: 1.35;
}

.rich-text-editor h3 {
  font-size: 0.9375rem;
  font-weight: 600;
  margin-top: 1rem;
  margin-bottom: 0.5rem;
  line-height: 1.4;
}

/* Paragraphs */
.rich-text-editor p {
  margin-top: 0.625rem;
  margin-bottom: 0.625rem;
  line-height: 1.625;
}

/* First child should not have top margin */
.rich-text-editor > *:first-child {
  margin-top: 0;
}

/* Last child should not have bottom margin */
.rich-text-editor > *:last-child {
  margin-bottom: 0;
}

/* Lists */
.rich-text-editor ul {
  list-style-type: disc;
  padding-inline-start: 1.25rem;
  padding-inline-end: 0.5rem;
  margin: 0.5rem 0;
}

.rich-text-editor ol {
  list-style-type: decimal;
  padding-inline-start: 1.5rem;
  margin: 0.5rem 0;
}

.rich-text-editor li {
  margin: 0.25rem 0;
  line-height: 1.625;
}

.rich-text-editor li + li {
  margin-top: 0.25rem;
}

.rich-text-editor li::marker {
  color: var(--muted-foreground);
}

/* Remove paragraph margins inside list items (Tiptap wraps li content in <p>) */
.rich-text-editor li > p {
  margin: 0;
}

.rich-text-editor li > p + p {
  margin-top: 0.25rem;
}

.rich-text-editor .math-node {
  display: inline-flex;
  max-width: 100%;
  vertical-align: middle;
}

.rich-text-editor .math-node.inline {
  align-items: center;
}

.rich-text-editor .math-node.block {
  display: block;
  margin: 0.75rem 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.rich-text-editor .math-node.block .katex-display {
  margin: 0;
}

.rich-text-editor .math-node .katex {
  max-width: 100%;
}

/* Nested lists — bullet style progression and tighter spacing */
.rich-text-editor ul ul {
  list-style-type: circle;
  margin: 0.25rem 0;
}

.rich-text-editor ul ul ul {
  list-style-type: square;
}

.rich-text-editor ol ol {
  list-style-type: lower-alpha;
  margin: 0.25rem 0;
}

.rich-text-editor ol ol ol {
  list-style-type: lower-roman;
}

/*
 * Task lists (checkboxes) — `- [ ]` / `- [x]`.
 *
 * The editor and readonly views emit DIFFERENT DOM, so they are styled
 * separately rather than sharing a flex rule:
 *
 *   - Editor (Tiptap NodeView):
 *       ul[data-type="taskList"] > li[data-checked]
 *         > label(contenteditable) > input + span
 *         > div(content) > p, [nested ul]
 *     The item body is wrapped in a <div>, so the row is a flex layout and a
 *     nested task list inside that <div> still stacks below the text.
 *
 *   - Readonly (remark-gfm):
 *       ul.contains-task-list > li.task-list-item
 *         > input[disabled] + text [ + nested ul ]
 *     There is NO body wrapper — a nested <ul> is a direct sibling of the
 *     checkbox and text. Flex here would pull the nested list onto the same
 *     row, so the item stays a block and the checkbox is positioned inline.
 */

/* Shared: checkbox appearance. */
.rich-text-editor input[type="checkbox"] {
  width: 0.95rem;
  height: 0.95rem;
  accent-color: var(--brand);
  cursor: pointer;
}

/* --- Editor (Tiptap) --- */
.rich-text-editor ul[data-type="taskList"] {
  list-style: none;
  padding-inline: 0;
  margin: 0.5rem 0;
}

/* Child combinators keep these rules off nested plain bullet/ordered lists. */
.rich-text-editor ul[data-type="taskList"] > li {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  padding: 0;
}

/* Checkbox column. The top margin nudges the box onto the first text line
   (line-height 1.625). */
.rich-text-editor ul[data-type="taskList"] > li > label {
  flex: 0 0 auto;
  margin: 0.28rem 0 0;
  user-select: none;
}

/* Content column fills the remaining width and may wrap/scroll. */
.rich-text-editor ul[data-type="taskList"] > li > div {
  flex: 1 1 auto;
  min-width: 0;
}

.rich-text-editor ul[data-type="taskList"] > li > div > p {
  margin: 0;
}

/* Completed editor item: muted text (no strikethrough), matching Linear. The
   NodeView keeps `data-checked` on the <li> (but not data-type). */
.rich-text-editor ul[data-type="taskList"] > li[data-checked="true"] > div {
  color: var(--muted-foreground);
}

/* --- Readonly (remark-gfm) --- */
.rich-text-editor ul.contains-task-list {
  list-style: none;
  padding-inline: 0;
  margin: 0.5rem 0;
}

.rich-text-editor li.task-list-item {
  padding-inline: 0;
}

/* Inline checkbox on the first text line; a nested <ul> stays block and drops
   below the item instead of sharing the row. */
.rich-text-editor li.task-list-item > input[type="checkbox"] {
  margin: 0 0.5rem 0 0;
  vertical-align: -0.1em;
}

/* Indent nested readonly task lists under their parent item. */
.rich-text-editor li.task-list-item .contains-task-list {
  padding-inline-start: 1.45rem;
  margin: 0.25rem 0;
}

/* Completed readonly item: muted text, matched via :has(input:checked). The
   reset keeps a completed parent from bleeding its muted color into the
   (independently evaluated) nested items below it. */
.rich-text-editor li.task-list-item:has(> input:checked) {
  color: var(--muted-foreground);
}

.rich-text-editor li.task-list-item:has(> input:checked) .contains-task-list {
  color: var(--foreground);
}

/* Tables */
.rich-text-editor .tableWrapper {
  overflow-x: auto;
  margin: 1rem 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.rich-text-editor table {
  min-width: 100%;
  border-collapse: collapse;
}

.rich-text-editor colgroup {
  display: none;
}

.rich-text-editor thead {
  background: color-mix(in srgb, var(--muted) 50%, transparent);
}

.rich-text-editor tbody tr {
  border-top: 1px solid var(--border);
}

.rich-text-editor tr:hover td {
  background: color-mix(in srgb, var(--muted) 30%, transparent);
  transition: background 0.15s;
}

.rich-text-editor th,
.rich-text-editor td {
  text-align: left;
  padding: 0.625rem 1rem;
  font-size: 0.875rem;
}

.rich-text-editor th {
  font-weight: 600;
}

/* Remove paragraph margin inside table cells */
.rich-text-editor th p,
.rich-text-editor td p {
  margin: 0;
}

/* Blockquotes */
.rich-text-editor blockquote {
  border-left: 3px solid color-mix(in srgb, var(--muted-foreground) 30%, transparent);
  padding-left: 0.75rem;
  margin: 0.625rem 0;
  color: var(--muted-foreground);
  font-style: italic;
}

.rich-text-editor blockquote p {
  margin-top: 0.25rem;
  margin-bottom: 0.25rem;
}

.rich-text-editor blockquote > *:first-child {
  margin-top: 0;
}

.rich-text-editor blockquote > *:last-child {
  margin-bottom: 0;
}

.rich-text-editor blockquote blockquote {
  margin-top: 0.25rem;
  margin-bottom: 0.25rem;
  border-left-color: color-mix(in srgb, var(--muted-foreground) 15%, transparent);
}

/* Horizontal rules */
.rich-text-editor hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1rem 0;
}

/* Links */
.rich-text-editor a {
  color: var(--brand);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--brand) 40%, transparent);
  text-underline-offset: 2px;
  cursor: pointer;
}

.rich-text-editor a:hover {
  text-decoration-color: var(--brand);
}

/* Issue mention cards — inline cards that sit within text flow */
.rich-text-editor a.issue-mention {
  color: inherit;
  text-decoration: none;
}

.rich-text-editor a.issue-mention:hover {
  text-decoration: none;
}

/* Mentions */
.rich-text-editor .mention {
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  margin: 0 0.125rem;
}

/* Slash command pills */
.rich-text-editor .slash-command {
  color: var(--primary);
  font-weight: 600;
  text-decoration: none;
  margin: 0 0.125rem;
}

/* Strong / emphasis */
.rich-text-editor strong {
  font-weight: 600;
}

.rich-text-editor em {
  font-style: italic;
}

.rich-text-editor s,
.rich-text-editor del {
  text-decoration: line-through;
  color: var(--muted-foreground);
}

/* Text highlight (`==text==` → <mark>). Single yellow tint that stays legible
   in both light and dark themes; `color: inherit` keeps the underlying text
   color so highlighted links/code remain readable. box-decoration-break clones
   the background across wrapped lines (same approach as inline code above). */
.rich-text-editor mark {
  background-color: color-mix(in srgb, #facc15 45%, transparent);
  color: inherit;
  border-radius: 0.2em;
  padding: 0 0.15em;
  box-decoration-break: clone;
  -webkit-box-decoration-break: clone;
}