/* Chalkboard: a slate board with chalk in dark mode, a whiteboard with markers
   in light mode. Canvas colours come from the same tokens (see board.js). */

:root {
  --bg: #e9ebe6;
  --surface: #f8f8f4;
  --board: #fdfdfa;
  --ink: #1e2a2d;
  --muted: #5a676c;
  --line: #d2d7d2;
  --grid: #e6e9e4;
  --frame: #b7bcc1;
  --frame-shadow: #8f959b;
  --write: #c98200;
  --read: #1d66c9;
  --accent: #cf2f74;
  --map-neg: #5a43c4;
  --map-zero: #fdfdfa;
  --map-pos: #d6432c;
  --map-lo: #fdfdfa;
  --map-mid: #f0a04a;
  --map-hi: #7c2314;
  --liquid: #6c9fd3;
  --gas-air: #fdfdfa;
  --gas-vapour: #cbb7ee;
  --solid: #a3abb0;
  --hatch: #4f595e;
  --cold: #9cc3e6;
  --code-bg: #f0f1ec;
  --hl: #fff1c2;
  --btn: #ffffff;
  --btn-ink: #1e2a2d;
  --primary: #1e2a2d;
  --primary-ink: #f8f8f4;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #141b19;
    --surface: #1b2422;
    --board: #22302b;
    --ink: #ecebe2;
    --muted: #9eaba5;
    --line: #33423d;
    --grid: #2c3b36;
    --frame: #6c4f34;
    --frame-shadow: #3f2d1d;
    --write: #ffe270;
    --read: #7ec8ff;
    --accent: #ff8fc2;
    --map-neg: #8b7dff;
    --map-zero: #22302b;
    --map-pos: #ff8a5b;
    --map-lo: #22302b;
    --map-mid: #b8743a;
    --map-hi: #ffe9aa;
    --liquid: #3b6d98;
    --gas-air: #22302b;
    --gas-vapour: #b4a3e8;
    --solid: #3a4642;
    --hatch: #8d9a93;
    --cold: #2f5873;
    --code-bg: #18201e;
    --hl: #3a3a22;
    --btn: #22302b;
    --btn-ink: #ecebe2;
    --primary: #ffe270;
    --primary-ink: #1b2422;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #141b19;
  --surface: #1b2422;
  --board: #22302b;
  --ink: #ecebe2;
  --muted: #9eaba5;
  --line: #33423d;
  --grid: #2c3b36;
  --frame: #6c4f34;
  --frame-shadow: #3f2d1d;
  --write: #ffe270;
  --read: #7ec8ff;
  --accent: #ff8fc2;
  --map-neg: #8b7dff;
  --map-zero: #22302b;
  --map-pos: #ff8a5b;
  --map-lo: #22302b;
  --map-mid: #b8743a;
  --map-hi: #ffe9aa;
  --liquid: #3b6d98;
  --gas-air: #22302b;
  --gas-vapour: #b4a3e8;
  --solid: #3a4642;
  --hatch: #8d9a93;
  --cold: #2f5873;
  --code-bg: #18201e;
  --hl: #3a3a22;
  --btn: #22302b;
  --btn-ink: #ecebe2;
  --primary: #ffe270;
  --primary-ink: #1b2422;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.5 "Atkinson Hyperlegible", system-ui, -apple-system, "Segoe UI", sans-serif;
}
.page {
  max-width: 1240px;
  margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
  padding-block: 20px 40px;
  display: grid;
  gap: 16px;
}
h1, h2 { text-wrap: balance; margin: 0; }
h1 {
  font-family: Kalam, "Comic Neue", "Segoe Print", cursive;
  font-weight: 700;
  font-size: clamp(1.75rem, 1.2rem + 2.4vw, 2.6rem);
  line-height: 1.1;
}
h2 {
  font-family: Kalam, "Comic Neue", "Segoe Print", cursive;
  font-weight: 700;
  font-size: 1.3rem;
  line-height: 1.2;
}
code, .mono { font-family: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, monospace; font-size: 0.88em; }
.muted { color: var(--muted); font-weight: 400; }
.kicker {
  margin: 0 0 4px;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.lede { margin: 10px 0 0; max-width: 68ch; }
.key { white-space: nowrap; }
.sw { display: inline-block; width: 0.9em; height: 0.9em; margin-right: 0.3em; vertical-align: -0.1em; border-radius: 2px; }
.sw.write { border: 2.5px solid var(--write); box-shadow: 0 0 6px var(--write); }
.sw.read { border: 2px dashed var(--read); }
.sw.accent { background: var(--accent); height: 0.35em; vertical-align: 0.15em; }

/* Controls */
.scenario {
  display: grid;
  grid-template-columns: minmax(0, 260px) minmax(0, 1fr);
  gap: 8px 20px;
  align-items: start;
}
.blurb { margin: 0; color: var(--muted); max-width: 72ch; }
.field { display: grid; gap: 4px; font-size: 0.82rem; color: var(--muted); }
.field > span { letter-spacing: 0.04em; }
.field.compact { gap: 2px; }
select, button, input { font: inherit; }
select {
  color: var(--ink);
  background: var(--btn);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 10px;
  font-size: 0.95rem;
  min-width: 0;
  max-width: 100%;
}
.transport {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 5;
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 8px 10px;
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
}
.btn {
  min-height: 40px;
  padding: 0 14px;
  border-radius: 9px;
  border: 1px solid var(--line);
  background: var(--btn);
  color: var(--btn-ink);
  cursor: pointer;
  font-weight: 700;
}
.btn:hover { border-color: var(--muted); }
.btn.primary { background: var(--primary); color: var(--primary-ink); border-color: var(--primary); min-width: 96px; }
.btn.ghost { background: transparent; }
.btn:focus-visible, select:focus-visible, input:focus-visible { outline: 2px solid var(--read); outline-offset: 2px; }
.speed { flex: 1 1 160px; min-width: 140px; }
.speed input { width: 100%; accent-color: var(--write); }
.speed output { font-family: "JetBrains Mono", ui-monospace, monospace; color: var(--ink); }
.check { display: flex; gap: 8px; align-items: center; font-size: 0.92rem; cursor: pointer; }
.check input { accent-color: var(--write); width: 18px; height: 18px; }

/* Layout */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  grid-template-areas:
    "board side"
    "plots side2";
  gap: 16px 22px;
  align-items: start;
}
.board-area { grid-area: board; display: grid; gap: 10px; min-width: 0; }
.side, .side2 { display: grid; gap: 16px; min-width: 0; align-content: start; }
.side { grid-area: side; }
.side2 { grid-area: side2; }
.plots { grid-area: plots; }
.notes, .inspector, .plots, .status, .lab {
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
  display: grid;
  gap: 10px;
}
.board-head { display: flex; flex-wrap: wrap; gap: 8px 16px; align-items: end; justify-content: space-between; }

/* The board, in its frame: wood around slate, aluminium around whiteboard. */
.frame {
  padding: clamp(6px, 1.4vw, 12px);
  background: var(--frame);
  border-radius: 10px;
  box-shadow: inset 0 -3px 0 var(--frame-shadow), 0 1px 0 var(--frame-shadow);
}
#board {
  display: block;
  width: 100%;
  max-width: 100%;
  aspect-ratio: 1;
  border-radius: 3px;
  background: var(--board);
  touch-action: manipulation;
  cursor: crosshair;
}
.legend { display: grid; gap: 3px; }
.legend-bar { height: 10px; border-radius: 5px; border: 1px solid var(--line); }
.legend-labels { display: flex; justify-content: space-between; gap: 8px; font: 0.78rem "JetBrains Mono", ui-monospace, monospace; color: var(--muted); }
.legend-name { margin: 0; font-size: 0.88rem; }

.crumbs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 4px 0;
  font-size: 0.86rem;
}
.crumbs li { color: var(--muted); }
.crumbs li + li::before { content: "›"; margin: 0 7px; color: var(--muted); }
.crumbs li:last-child { color: var(--ink); font-weight: 700; }

/* Notes: pseudo-code with the active line chalked in. */
.code {
  list-style: none;
  margin: 0;
  padding: 10px 0;
  background: var(--code-bg);
  border-radius: 8px;
  overflow-x: auto;
  font: 0.82rem/1.55 "JetBrains Mono", ui-monospace, monospace;
  counter-reset: line;
}
.code li { white-space: pre; padding: 0 12px 0 10px; border-left: 3px solid transparent; }
.code li.on { background: var(--hl); border-left-color: var(--write); }
.doc-text { margin: 0; max-width: 65ch; }
.op-note {
  margin: 0;
  font-family: Kalam, "Comic Neue", cursive;
  font-size: 1.05rem;
  color: var(--accent);
}

/* Plots */
.plots { gap: 14px; }
.plots figure { margin: 0; display: grid; gap: 6px; }
.plots figcaption { font-size: 0.88rem; }
.plot { width: 100%; height: 190px; display: block; }
.plot-legend { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; font-size: 0.84rem; color: var(--muted); }
.plot-legend li::before { content: ""; display: inline-block; width: 18px; margin-right: 8px; vertical-align: 0.3em; border-top: 2px dashed var(--muted); }
.plot-legend li.live { color: var(--ink); }
.plot-legend li.live::before { border-top: 3px solid var(--write); }
.timeline { width: 100%; height: 64px; display: block; }
.status-line { margin: 0; font-size: 0.92rem; }
.hint { margin: 0; font-size: 0.82rem; color: var(--muted); }

/* Inspector */
.vals {
  margin: 0;
  display: grid;
  grid-template-columns: max-content minmax(0, 1fr);
  gap: 2px 14px;
  font-size: 0.9rem;
}
.vals dt { color: var(--muted); }
.vals dd { margin: 0; font-family: "JetBrains Mono", ui-monospace, monospace; font-size: 0.84rem; overflow-wrap: anywhere; }
.stencil-cap { margin: 0 0 6px; font-size: 0.82rem; color: var(--muted); }
.stencil {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  grid-template-rows: repeat(3, auto);
  gap: 4px;
  max-width: 360px;
  font: 0.78rem "JetBrains Mono", ui-monospace, monospace;
}
.stencil div {
  padding: 6px 4px;
  text-align: center;
  border-radius: 6px;
  border: 1px dashed var(--read);
  overflow-wrap: anywhere;
}
.stencil div.c { border: 2px solid var(--write); }
.stencil div.blank { border: none; }
.stencil div.zero { opacity: 0.4; }

.foot { color: var(--muted); font-size: 0.86rem; max-width: 80ch; }
.foot p { margin: 0; }

@media (max-width: 860px) {
  .layout {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: "board" "notes" "plots" "inspector" "status" "lab";
  }
  .side, .side2 { display: contents; }
  .notes { grid-area: notes; }
  .inspector { grid-area: inspector; }
  .status { grid-area: status; }
  .lab { grid-area: lab; }
  .scenario { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 480px) {
  .transport { padding: 8px; gap: 6px 8px; }
  .btn { padding: 0 11px; }
  .plot { height: 170px; }
}