/* Semantic Markdown playground: the page around the editor and the preview frame (smd.css styles the preview). */
:root {
  color-scheme: light;
  --bg: #f8fafc;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --border: #cbd5e1;
  --accent: #4f46e5;
  --accent-text: #ffffff;
  --gutter: #94a3b8;
  --error: #b91c1c;
  --warning: #a16207;
  --info: #1d4ed8;
  --hint: #475569;
  --notice-bg: #eef2ff;
  --warn-bg: #fef9c3;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #0b1120;
    --surface: #111827;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --border: #334155;
    --accent: #818cf8;
    --accent-text: #0b1120;
    --gutter: #64748b;
    --error: #f87171;
    --warning: #facc15;
    --info: #93c5fd;
    --hint: #94a3b8;
    --notice-bg: #1e1b4b;
    --warn-bg: #422006;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b1120;
  --surface: #111827;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --border: #334155;
  --accent: #818cf8;
  --accent-text: #0b1120;
  --gutter: #64748b;
  --error: #f87171;
  --warning: #facc15;
  --info: #93c5fd;
  --hint: #94a3b8;
  --notice-bg: #1e1b4b;
  --warn-bg: #422006;
}

* { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.5 var(--sans);
}

button, select {
  font: inherit;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  cursor: pointer;
}

button.primary {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-text);
}

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  padding: 8px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.bar h1 { margin: 0; font-size: 1.05rem; }
.bar h1 span { color: var(--muted); font-weight: 400; }
.actions { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; }
.theme { display: flex; align-items: center; gap: 6px; color: var(--muted); }

.notice {
  margin: 0;
  padding: 6px 16px;
  background: var(--notice-bg);
  border-bottom: 1px solid var(--border);
}

.notice[data-kind="warning"] { background: var(--warn-bg); }

.layout {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
}

.pane { min-width: 0; min-height: 0; display: flex; flex-direction: column; }
.editor-pane { border-right: 1px solid var(--border); }

.editor {
  flex: 1;
  min-height: 0;
  display: flex;
  background: var(--surface);
  font: 13px/20px var(--mono);
}

.gutter {
  margin: 0;
  padding: 12px 8px 12px 12px;
  min-width: 3.5em;
  overflow: hidden;
  text-align: right;
  color: var(--gutter);
  user-select: none;
  font: inherit;
  border-right: 1px solid var(--border);
}

#source {
  flex: 1;
  min-width: 0;
  margin: 0;
  padding: 12px;
  border: 0;
  resize: none;
  background: transparent;
  color: var(--text);
  font: inherit;
  tab-size: 2;
  white-space: pre;
  overflow: auto;
}

#source:focus-visible { outline-offset: -2px; }

.help { margin: 0; padding: 4px 12px; color: var(--muted); font-size: 0.8rem; border-top: 1px solid var(--border); }

.tabs {
  display: flex;
  overflow-x: auto;
  gap: 2px;
  padding: 6px 8px 0;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.tabs [role="tab"] {
  flex: none;
  border: 0;
  border-bottom: 2px solid transparent;
  border-radius: 6px 6px 0 0;
  background: transparent;
  color: var(--muted);
}

.tabs [role="tab"][aria-selected="true"] { color: var(--text); border-bottom-color: var(--accent); }
.count { font-size: 0.75rem; color: var(--muted); }

.panel { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.panel[hidden] { display: none; }

#preview { flex: 1; width: 100%; border: 0; background: var(--surface); }

.meta { margin: 0; padding: 8px 12px; color: var(--muted); font-size: 0.85rem; border-bottom: 1px solid var(--border); }
.meta button { margin-left: 8px; padding: 2px 8px; font-size: 0.8rem; }

.text {
  flex: 1;
  margin: 0;
  padding: 12px;
  overflow: auto;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  font: 13px/20px var(--mono);
  background: var(--surface);
}

.diagnostics { flex: 1; margin: 0; padding: 8px; list-style: none; overflow: auto; }
.diagnostics .empty { padding: 8px; color: var(--muted); }

.diagnostic {
  display: grid;
  grid-template-columns: auto auto 1fr;
  gap: 2px 10px;
  width: 100%;
  margin-bottom: 6px;
  text-align: left;
  border-left: 4px solid var(--hint);
}

.diagnostic .where { font-family: var(--mono); color: var(--muted); }
.diagnostic .severity { font-weight: 600; text-transform: capitalize; }
.diagnostic code { grid-column: 3; color: var(--muted); font-size: 0.8rem; }
.diagnostic-error { border-left-color: var(--error); }
.diagnostic-error .severity { color: var(--error); }
.diagnostic-warning { border-left-color: var(--warning); }
.diagnostic-warning .severity { color: var(--warning); }
.diagnostic-info { border-left-color: var(--info); }
.diagnostic-info .severity { color: var(--info); }

/* Phones and narrow windows: the editor above the output. */
@media (max-width: 768px) {
  body { height: auto; min-height: 100%; }
  .layout { grid-template-columns: minmax(0, 1fr); grid-auto-rows: minmax(60vh, auto); }
  .editor-pane { border-right: 0; border-bottom: 1px solid var(--border); }
  .editor { height: 55vh; flex: none; }
  .panel { min-height: 70vh; }
  .bar { padding: 8px 16px; }
  .tabs [role="tab"] { padding: 4px 8px; }
}