/* Markdown viewer styles (SPEC-0003 REQ "Markdown Viewer", issue #18 turn 6d).
   Typography per the design tokens: IBM Plex Sans prose (--sans), JetBrains Mono
   chrome/ids (--mono). Loaded for every shell page but scoped under .md-viewer,
   so it is inert on non-markdown bodies. All colors carry sufficient contrast
   for WCAG 2.1 AA and nothing is conveyed by color alone. */

.md-viewer {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  max-width: 860px;
  margin: 0 auto;
  padding: 26px 30px 60px;
}

/* CONTENTS — collapsible multi-level TOC (native <details> => keyboard-operable
   and exposes aria-expanded on the caret with no JS). */
.md-toc {
  border: 1px solid var(--border-2);
  border-radius: var(--radius-card);
  background: var(--well-2);
  padding: 12px 16px;
}
.md-toc-summary {
  cursor: pointer;
  font: 600 11px/1.4 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--t5);
  list-style: none;
}
.md-toc-summary::-webkit-details-marker { display: none; }
.md-toc-summary::before {
  content: "▸";
  display: inline-block;
  margin-right: 8px;
  color: var(--t6);
  transition: transform 0.12s ease;
}
.md-toc-fold[open] > .md-toc-summary::before { transform: rotate(90deg); }
.md-toc-list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0 0 0 4px;
}
.md-toc-list .md-toc-list { padding-left: 16px; }
.md-toc-item { margin: 2px 0; }
.md-toc-link {
  display: block;
  padding: 3px 6px;
  border-radius: 4px;
  color: var(--t3);
  text-decoration: none;
  font-size: 13px;
  border-left: 2px solid transparent;
}
.md-toc-link[data-level="1"] { font-weight: 600; color: var(--t1); }
.md-toc-link:hover { background: var(--well); color: var(--t0); }
/* Active-item flash when a TOC link is jumped to (md.js adds .toc-active). */
.md-toc-link.toc-active {
  border-left-color: var(--green);
  background: rgba(86, 227, 159, 0.08);
  color: var(--t0);
}
.md-stats {
  margin: 10px 0 0;
  font: 400 11px/1.5 var(--mono);
  color: var(--t6);
}

/* PROSE */
.md-prose { font: 400 15px/1.7 var(--sans); color: var(--t2); }

.md-block { position: relative; }
.md-block:hover > .md-react,
.md-block:focus-within > .md-react { opacity: 1; }

.md-block-body > :first-child { margin-top: 0; }
.md-block-body > :last-child { margin-bottom: 0; }
.md-block-body { padding: 2px 0; }

.md-prose h1, .md-prose h2, .md-prose h3,
.md-prose h4, .md-prose h5, .md-prose h6 {
  font-family: var(--sans);
  color: var(--t0);
  line-height: 1.3;
  scroll-margin-top: 74px; /* clear the sticky header on TOC jump */
}
.md-prose h1 { font-size: 26px; font-weight: 600; margin: 28px 0 12px; }
.md-prose h2 { font-size: 20px; font-weight: 600; margin: 26px 0 10px; }
.md-prose h3 { font-size: 16px; font-weight: 600; margin: 22px 0 8px; }
.md-prose p { margin: 12px 0; }
.md-prose a { color: var(--green); text-decoration: underline; text-underline-offset: 2px; }
.md-prose a:hover { color: var(--green-2); }
.md-prose ul, .md-prose ol { margin: 12px 0; padding-left: 26px; }
.md-prose li { margin: 4px 0; }
.md-prose strong { color: var(--t0); font-weight: 600; }
.md-prose hr { border: none; border-top: 1px solid var(--border-2); margin: 24px 0; }

/* Blockquote — a left rule in the purple accent (design token). */
.md-prose blockquote {
  margin: 14px 0;
  padding: 4px 16px;
  border-left: 3px solid var(--purple);
  background: var(--well-2);
  color: var(--t3);
  border-radius: 0 6px 6px 0;
}

/* Inline code + fenced code blocks (JetBrains Mono chrome). */
.md-prose code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--well);
  border: 1px solid var(--border-3);
  border-radius: var(--radius-chip);
  padding: 1px 5px;
}
.md-prose pre {
  margin: 14px 0;
  padding: 14px 16px;
  background: var(--well-2);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-card);
  overflow-x: auto;
}
.md-prose pre code {
  background: none;
  border: none;
  padding: 0;
  font-size: 13px;
  line-height: 1.55;
  color: var(--t2);
}

.md-prose table {
  border-collapse: collapse;
  margin: 14px 0;
  width: 100%;
  font-size: 14px;
}
.md-prose th, .md-prose td {
  border: 1px solid var(--border-2);
  padding: 6px 10px;
  text-align: left;
}
.md-prose th { background: var(--well-2); color: var(--t1); }

/* React `＋` affordance — one per block, revealed on hover/focus, always
   keyboard-reachable. Icon-only, so it carries an aria-label (set in the
   template). md_bullet buttons md.js injects share the .md-react look. */
.md-react {
  position: absolute;
  left: -34px;
  top: 2px;
  width: 24px;
  height: 24px;
  padding: 0;
  border: 1px solid var(--border-2);
  border-radius: 6px;
  background: var(--card);
  color: var(--t5);
  font: 600 15px/1 var(--sans);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.1s ease, color 0.1s ease, border-color 0.1s ease;
}
.md-react:hover, .md-react:focus-visible { color: var(--green); border-color: var(--green-3); opacity: 1; }
.md-bullet-react {
  position: static;
  margin-right: 6px;
  width: 20px;
  height: 20px;
  font-size: 13px;
  vertical-align: middle;
  opacity: 0.55;
}

/* Block/bullet reaction pills (#66) — md.js inserts one per emoji, always
   visible (unlike the hover-revealed ＋ affordance above), matching the
   trajectory viewer's react-pill look so a reaction reads the same across
   surfaces. A block pill flows in the normal document flow right after the
   prose (the ＋ trigger it sits beside is position:absolute and out of flow);
   a bullet pill sits inline with the ＋ trigger, both position:static. */
.md-react-pill {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: var(--well);
  border: 1px solid var(--border-2);
  border-radius: 999px;
  padding: 2px 9px;
  margin: 6px 6px 0 0;
  cursor: pointer;
  color: var(--t4);
  font: 500 11px var(--mono);
}
.md-react-pill.on { border-color: #244034; background: rgba(86,227,159,.12); color: var(--green-2); }
.md-react-pill .react-count { color: var(--t3); }
.md-react-pill.on .react-count { color: var(--green-2); }
/* A pill beside a bullet trigger (both position:static, inserted right before
   it) reads inline with the ＋ icon rather than dropping to a new line. */
li > .md-react-pill { display: inline-flex; vertical-align: middle; margin: 0 4px 0 0; }
.md-react-error {
  display: inline-block;
  color: var(--red, #e05a5a);
  font: 500 10.5px var(--mono);
  margin-left: 4px;
}

/* Selection → comment toolbar md.js floats above a text selection. */
.md-sel-toolbar {
  position: absolute;
  z-index: 30;
  display: flex;
  gap: 6px;
  padding: 4px;
  background: var(--header);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.4);
}
.md-sel-toolbar button {
  font: 600 12px/1 var(--sans);
  color: var(--t1);
  background: var(--well);
  border: 1px solid var(--border-2);
  border-radius: 6px;
  padding: 6px 10px;
  cursor: pointer;
}
.md-sel-toolbar button:hover { color: var(--green); border-color: var(--green-3); }

@media (max-width: 720px) {
  .md-viewer { padding: 18px 16px 48px; }
  .md-react { left: -6px; top: -30px; }
}