/* lark-rs playground — dead-simple, framework-free, mobile-first.
   Two columns on wide screens, one column on phones. 16px form fields so
   iOS Safari doesn't zoom on focus. */

:root {
  --bg: #ffffff;
  --fg: #1a1a2e;
  --muted: #6b7280;
  --border: #d1d5db;
  --panel: #f8fafc;
  --accent: #6d28d9;
  --error-bg: #fef2f2;
  --error-fg: #b91c1c;
  --token-bg: #eef2ff;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111118;
    --fg: #e5e7eb;
    --muted: #9ca3af;
    --border: #374151;
    --panel: #1a1a24;
    --accent: #a78bfa;
    --error-bg: #2d1515;
    --error-fg: #f87171;
    --token-bg: #1e2240;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  padding: 0 1rem 2rem;
  max-width: 70rem;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}

header { padding: 1rem 0 0; }
h1 { margin: 0; font-size: 1.5rem; }
h1 .thin { font-weight: 300; color: var(--muted); }
.sub { margin: 0.25rem 0 0; color: var(--muted); font-size: 0.9rem; }
.sub a { color: var(--accent); }

/* ---- embed mode (iframed into the showcase, ?embed=1) ------------------ */
/* Drop our own chrome and tune the accent to the showcase's sky blue so the
   panel reads as part of the host page rather than a pasted-in app. */
.embed body { padding: 0 .25rem .25rem; max-width: none; background: transparent; }
.embed > body { color: #181a1e; }
.embed header, .embed footer { display: none; }
.embed main { margin-top: .25rem; }
.embed { --accent: #3f718f; }
@media (prefers-color-scheme: dark) { .embed { --accent: #7fb0d6; } }
.version { white-space: nowrap; }

main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-top: 1rem;
}

@media (max-width: 800px) {
  main { grid-template-columns: 1fr; }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem;
  min-width: 0; /* let grid children shrink instead of overflowing on phones */
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  align-items: center;
  margin-bottom: 0.75rem;
  font-size: 0.85rem;
  color: var(--muted);
}
.controls label { display: inline-flex; align-items: center; gap: 0.4rem; }
.controls .check { gap: 0.3rem; }

select, input[type="text"], button {
  font: inherit;
  font-size: 16px; /* not rem-relative: prevents iOS focus zoom */
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.3rem 0.5rem;
  min-height: 2.25rem; /* comfortable touch target */
}
input[type="checkbox"] { width: 1.1rem; height: 1.1rem; }

button { cursor: pointer; }
button:hover { border-color: var(--accent); }

.area-label {
  display: block;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

textarea {
  width: 100%;
  min-height: 14rem;
  resize: vertical;
  font-family: var(--mono);
  font-size: 16px; /* prevents iOS focus zoom */
  line-height: 1.4;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.5rem;
  -webkit-text-size-adjust: 100%;
}
#input { min-height: 8rem; }

details { margin-top: 0.75rem; font-size: 0.9rem; }
summary { cursor: pointer; color: var(--muted); }
.hint { color: var(--muted); font-size: 0.85rem; margin: 0.5rem 0; }

.import-row { margin: 0.5rem 0; }
.import-row-head { display: flex; gap: 0.5rem; margin-bottom: 0.25rem; }
.import-row-head input { flex: 1; min-width: 0; font-family: var(--mono); }
.import-row textarea { min-height: 6rem; }
#add-import { margin-top: 0.25rem; }

.out-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 0.75rem;
}
.tabs { display: flex; gap: 0.25rem; }
.tabs button { border-radius: 6px 6px 0 0; border-bottom: none; }
.tabs button.active { background: var(--token-bg); color: var(--accent); font-weight: 600; }
.status { color: var(--muted); font-size: 0.85rem; text-align: right; }

.output {
  border: 1px solid var(--border);
  border-radius: 0 6px 6px 6px;
  background: var(--bg);
  padding: 0.5rem;
  margin: 0;
  overflow: auto;
  max-height: 32rem;
  font-family: var(--mono);
  font-size: 0.85rem;
}

.error {
  margin-top: 0.5rem;
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  background: var(--error-bg);
  color: var(--error-fg);
  font-family: var(--mono);
  font-size: 0.85rem;
  white-space: pre-wrap;
}

/* Rendered tree */
.output details { margin: 0; font-size: inherit; }
.output summary { color: inherit; }
.output ul {
  list-style: none;
  margin: 0;
  padding-left: 1.1rem;
  border-left: 1px dotted var(--border);
}
.output li { margin: 0.1rem 0; }
.rule { font-weight: 600; color: var(--accent); }
.rule.ambig { color: var(--error-fg); }
.token { background: var(--token-bg); border-radius: 4px; padding: 0 0.3rem; }
.tok-type { color: var(--muted); font-size: 0.8em; }
.tok-value { font-weight: 600; }
.hole { color: var(--muted); font-style: italic; }

footer { margin-top: 1.5rem; color: var(--muted); font-size: 0.85rem; }