/* ============================================================
   "Interactive toys" draft — lab-notebook aesthetic.
   Loaded only by the draft post via page.extra_css.
   The blog header/footer/theme are inherited from blog.css.
   ============================================================ */

:root,
[data-theme="light"] {
  --lab-paper:   #f4f1ea;   /* warm off-white */
  --lab-ink:     #14130f;
  --lab-soft:    #4f4a40;
  --lab-muted:   #8a8472;
  --lab-rule:    #1a1a1c;
  --lab-rule-soft: #d6d0c0;
  --lab-cell-bg: #fbf9f3;
  --lab-accent:  #c33a16;   /* cinnabar */
  --lab-live:    #c33a16;
  --lab-mono:    "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --lab-serif:   "Newsreader", "Source Serif 4", "Source Serif Pro", Georgia, serif;
}

[data-theme="dark"] {
  --lab-paper:   #0e0e10;
  --lab-ink:     #ece8df;
  --lab-soft:    #a39e92;
  --lab-muted:   #6c685f;
  --lab-rule:    #d6d0c0;
  --lab-rule-soft: #2a2a2c;
  --lab-cell-bg: #161618;
  --lab-accent:  #ff6b4a;
  --lab-live:    #ff6b4a;
}

/* Scope everything to .lab so it can't leak. */
.lab {
  background: var(--lab-paper);
  color: var(--lab-ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", sans-serif;
  padding: 2rem 0 1rem;
  margin: 1rem 0 2rem;
  border-top: 1px solid var(--lab-rule);
  border-bottom: 1px solid var(--lab-rule);
}

.lab .lab-inner {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- Master index strip --- */
.lab-index {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: baseline;
  gap: 1rem;
  font-family: var(--lab-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--lab-soft);
  padding-bottom: 0.75rem;
  margin-bottom: 2.5rem;
  border-bottom: 1px solid var(--lab-rule);
}
.lab-index .lab-index-title { color: var(--lab-ink); }
.lab-index .lab-index-count {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum";
}

/* --- Cell --- */
.lab-cell {
  margin: 0 0 4rem;
}
.lab-cell-head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 1rem;
  align-items: baseline;
  padding-bottom: 0.5rem;
  margin-bottom: 0.6rem;
  border-bottom: 1px dashed var(--lab-rule-soft);
}

.lab-cell-id {
  font-family: var(--lab-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--lab-soft);
  font-variant-numeric: tabular-nums;
}

.lab-cell-name {
  font-family: var(--lab-serif);
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--lab-ink);
  margin: 0;
  line-height: 1.15;
}

/* Status chip */
.lab-chip {
  font-family: var(--lab-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 2px 8px;
  border: 1px solid var(--lab-rule-soft);
  border-radius: 999px;
  color: var(--lab-soft);
  display: inline-flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}
.lab-chip .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--lab-soft);
}
.lab-chip.live { color: var(--lab-live); border-color: var(--lab-live); }
.lab-chip.live .dot {
  background: var(--lab-live);
  animation: lab-pulse 1.8s ease-out infinite;
}
@keyframes lab-pulse {
  0%   { box-shadow: 0 0 0 0 rgba(195, 58, 22, 0.5); }
  70%  { box-shadow: 0 0 0 8px rgba(195, 58, 22, 0); }
  100% { box-shadow: 0 0 0 0 rgba(195, 58, 22, 0); }
}
.lab-chip.heavy { color: var(--lab-soft); border-style: dashed; }

.lab-cell-note {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--lab-soft);
  margin: 0 0 1rem;
  max-width: 65ch;
}

/* The "viewport" — where the demo runs. */
.lab-stage {
  position: relative;
  background: var(--lab-cell-bg);
  border: 1px solid var(--lab-rule-soft);
  border-radius: 4px;
  overflow: hidden;
  min-height: 280px;
}

/* Tick marks at the corners — engineering datasheet vibe. */
.lab-stage::before,
.lab-stage::after {
  content: "";
  position: absolute;
  width: 12px;
  height: 12px;
  border: 1px solid var(--lab-rule);
  pointer-events: none;
}
.lab-stage::before { top: -1px; left: -1px; border-right: 0; border-bottom: 0; }
.lab-stage::after  { bottom: -1px; right: -1px; border-left: 0; border-top: 0; }

/* Caption row under the viewport */
.lab-cell-caption {
  font-family: var(--lab-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--lab-muted);
  margin: 0.6rem 0 0;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

/* --- Demo 01: Three.js canvas --- */
#lab-three { width: 100%; height: 360px; display: block; }

/* --- Demo 02: Particles --- */
#lab-particles { width: 100%; height: 320px; display: block; cursor: crosshair; }

/* --- Demo 03: Audio --- */
.lab-audio {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--lab-rule-soft);
  min-height: 280px;
}
.lab-audio-pads {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--lab-rule-soft);
}
.lab-pad {
  background: var(--lab-cell-bg);
  border: 0;
  font-family: var(--lab-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--lab-soft);
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 4px;
  padding: 1rem;
}
.lab-pad:hover { background: var(--lab-paper); color: var(--lab-ink); }
.lab-pad.is-on { background: var(--lab-accent); color: #fff; }
.lab-pad .pad-freq { font-size: 0.65rem; opacity: 0.7; }
#lab-audio-scope { display: block; width: 100%; height: 100%; background: var(--lab-cell-bg); }

/* --- Demo 04: JS playground --- */
.lab-play {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--lab-rule-soft);
  min-height: 280px;
}
.lab-play textarea,
.lab-play .lab-play-out {
  font-family: var(--lab-mono);
  font-size: 13px;
  line-height: 1.55;
  background: var(--lab-cell-bg);
  color: var(--lab-ink);
  border: 0;
  outline: 0;
  padding: 0.9rem 1rem;
  resize: none;
  white-space: pre-wrap;
  overflow-y: auto;
  min-height: 280px;
  tab-size: 2;
}
.lab-play textarea:focus { background: var(--lab-paper); }
.lab-play .lab-play-out { color: var(--lab-soft); }
.lab-play .lab-play-out .err { color: var(--lab-accent); }
.lab-play-toolbar {
  grid-column: 1 / -1;
  display: flex;
  gap: 8px;
  padding: 6px 8px;
  background: var(--lab-paper);
  border-top: 1px solid var(--lab-rule-soft);
}
.lab-btn {
  font-family: var(--lab-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 12px;
  background: var(--lab-ink);
  color: var(--lab-paper);
  border: 1px solid var(--lab-ink);
  border-radius: 2px;
  cursor: pointer;
}
.lab-btn:hover { background: var(--lab-accent); border-color: var(--lab-accent); }
.lab-btn.ghost { background: transparent; color: var(--lab-soft); border-color: var(--lab-rule-soft); }
.lab-btn.ghost:hover { color: var(--lab-ink); border-color: var(--lab-ink); background: transparent; }

/* --- Demo 05: Math (KaTeX) --- */
.lab-math {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  padding: 1.5rem;
}
.lab-math .formula {
  font-size: 1.4rem;
  text-align: center;
  min-height: 60px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--lab-ink);
}
.lab-math .controls {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-family: var(--lab-mono);
  font-size: 0.82rem;
  color: var(--lab-soft);
  border-top: 1px dashed var(--lab-rule-soft);
  padding-top: 1rem;
}
.lab-math input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  height: 2px;
  background: var(--lab-rule-soft);
  outline: none;
}
.lab-math input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--lab-accent);
  cursor: pointer;
}
.lab-math .val { font-variant-numeric: tabular-nums; min-width: 4ch; text-align: right; }

/* --- Demo 06: Pyodide --- */
.lab-py {
  padding: 1.5rem;
  display: grid;
  gap: 1rem;
}
.lab-py .state {
  font-family: var(--lab-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--lab-muted);
}
.lab-py textarea,
.lab-py .lab-py-out {
  font-family: var(--lab-mono);
  font-size: 13px;
  background: var(--lab-cell-bg);
  border: 1px solid var(--lab-rule-soft);
  border-radius: 2px;
  padding: 0.7rem 0.9rem;
  color: var(--lab-ink);
  width: 100%;
  resize: vertical;
  min-height: 100px;
  outline: 0;
  white-space: pre-wrap;
}
.lab-py .lab-py-out { min-height: 60px; color: var(--lab-soft); }
.lab-py .row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }

/* --- Closing block --- */
.lab-end {
  text-align: center;
  font-family: var(--lab-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--lab-muted);
  padding: 1rem 0 0;
  border-top: 1px dashed var(--lab-rule-soft);
  margin-top: 2rem;
}

@media (max-width: 640px) {
  .lab-inner   { padding: 0 1.15rem; }
  .lab-cell    { margin-bottom: 3rem; }
  .lab-audio,
  .lab-play    { grid-template-columns: 1fr; }
  #lab-three   { height: 280px; }
}

@media (prefers-reduced-motion: reduce) {
  .lab-chip.live .dot { animation: none; }
}