/* concurrANTcy
   The look is a toy ant farm: a green plastic frame around sand.
   Colours carry meaning everywhere in the game:
     ink brown  = the brain, thinking, code running now
     sky blue   = waiting, walking, await
     fire red   = races, bugs, lost work
     leaf green = the frame, success
*/

:root {
  --sand: #f3e4bd;
  --sand-deep: #e6c98f;
  --sand-shade: #cfa866;
  --sand-dark: #b58b4c;
  --tunnel: #6b4423;
  --ink: #2b1c12;
  --ink-soft: #5e4632;
  --frame: #3e8c3b;
  --frame-dark: #2c6a2a;
  --frame-pale: #d7ecc9;
  --sky: #2b78bb;
  --sky-pale: #d8eaf7;
  --fire: #c93a2b;
  --fire-pale: #f7d8d0;
  --wasp: #6d5b8e;
  --wasp-pale: #e2dcee;
  --soil: #2a1b12;
  --soil-2: #3a291c;
  --panel: rgba(255, 250, 235, 0.55);

  --display: 'Bricolage Grotesque', 'Avenir Next Condensed', 'Arial Narrow', system-ui, sans-serif;
  --body: 'Atkinson Hyperlegible', 'Verdana', system-ui, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;

  --measure: 66ch;
  color-scheme: light;
}

* { box-sizing: border-box; }



body {
  margin: 0;
  background: var(--sand);
  color: var(--ink);
  font: 18px/1.62 var(--body);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--tunnel); text-underline-offset: 3px; }
a:hover { color: var(--ink); }

:focus-visible {
  outline: 3px solid var(--sky);
  outline-offset: 2px;
  border-radius: 4px;
}

h1, h2, h3, h4 {
  font-family: var(--display);
  line-height: 1.12;
  letter-spacing: -0.01em;
  margin: 0;
}

/* ---------------------------------------------------------------- topbar */

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 20px;
  border-bottom: 2px solid var(--sand-shade);
  background: var(--sand);
  position: sticky;
  top: 0;
  z-index: 10;
}
.home-link {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.05rem;
  text-decoration: none;
  color: var(--ink);
}
.topbar-progress { font-size: 0.9rem; color: var(--ink-soft); }

/* ---------------------------------------------------------------- buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font: 700 1rem/1.2 var(--body);
  padding: 10px 18px;
  border-radius: 10px;
  border: 0;
  border-bottom: 3px solid var(--frame-dark);
  background: var(--frame);
  color: #fff;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.06s;
}
.btn:hover { background: #46993f; color: #fff; }
.btn:active { transform: translateY(2px); border-bottom-width: 1px; margin-bottom: 2px; }
.btn:disabled { opacity: 0.45; cursor: not-allowed; transform: none; }
.btn.ghost {
  background: transparent;
  color: var(--ink);
  border: 2px solid var(--ink-soft);
  border-bottom-width: 2px;
}
.btn.ghost:hover { background: rgba(43, 28, 18, 0.07); }
.btn.small { font-size: 0.88rem; padding: 6px 12px; }
.btn.big { font-size: 1.1rem; padding: 14px 24px; }
.btn.danger { background: var(--fire); border-bottom-color: #8e2419; }
.btn.ant-btn {
  background: var(--ant);
  border-bottom-color: rgba(0, 0, 0, 0.35);
  width: 100%;
}
.linkish {
  background: none;
  border: 0;
  padding: 0;
  font: inherit;
  color: var(--tunnel);
  text-decoration: underline;
  text-underline-offset: 3px;
  cursor: pointer;
}

.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 14px 0;
}

.toggle {
  font: 0.9rem/1.3 var(--body);
  padding: 7px 12px;
  border-radius: 999px;
  border: 2px solid var(--sand-dark);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}
.toggle[aria-pressed='true'] { background: var(--ink); border-color: var(--ink); color: var(--sand); }

/* ---------------------------------------------------------------- home */

.home {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 540px);
  gap: 48px;
  max-width: 1180px;
  margin: 0 auto;
  padding: 48px 24px 80px;
  align-items: start;
}
.home-text { position: sticky; top: 90px; }
.title {
  font-size: clamp(3.2rem, 8vw, 6.4rem);
  font-weight: 800;
  line-height: 0.88;
  letter-spacing: -0.035em;
  display: flex;
  flex-direction: column;
  margin-bottom: 20px;
}
.title span:last-child { padding-left: 0.9em; color: var(--tunnel); }
.lede { font-size: 1.3rem; line-height: 1.4; margin: 0 0 20px; max-width: 30ch; }
.progress-line { color: var(--ink-soft); margin: 0; }
.small-links { display: flex; gap: 20px; font-size: 0.95rem; }

.home-map { padding: 0; overflow: hidden; }
.map { display: block; width: 100%; height: auto; }
.map .sky { fill: #cfe6f2; }
.map .stratum.s0 { fill: #ecd29b; }
.map .stratum.s1 { fill: #e4c486; }
.map .stratum.s2 { fill: #dcb776; }
.map .mound { fill: #c79a58; }
.map .hole { fill: var(--soil); }
.map .grass { fill: var(--frame); }
.map-tunnel-shadow { fill: none; stroke: #a57a41; stroke-width: 26; stroke-linecap: round; }
.map-tunnel { fill: none; stroke: #8d6232; stroke-width: 18; stroke-linecap: round; }
.map-chamber { cursor: pointer; }
.map-chamber .room { fill: #a3783f; stroke: #7f5a2c; stroke-width: 3; }
.map-chamber .ring { fill: none; stroke: transparent; stroke-width: 4; }
.map-chamber .num { font: 800 30px var(--display); fill: #f3e4bd; }
.map-chamber .ctitle { font: 700 19px var(--display); fill: var(--ink); }
.map-chamber .cshort { font: 14px var(--body); fill: var(--ink-soft); }
.map-chamber.started .room { fill: #7f5a2c; }
.map-chamber.done .room { fill: var(--soil-2); stroke: var(--soil); }
.map-chamber.done .num { fill: #cfa866; }
.map-chamber:hover .room, .map-chamber:focus-visible .room { stroke: var(--frame); stroke-width: 5; }
.map-chamber:focus-visible { outline: none; }
.map-chamber:focus-visible .ring { stroke: var(--sky); }
.map-chamber.next .ring { stroke: var(--frame); stroke-dasharray: 10 8; animation: march 1.6s linear infinite; }
@keyframes march { to { stroke-dashoffset: -36; } }

/* ---------------------------------------------------------------- frame */

.frame {
  position: relative;
  border: 12px solid var(--frame);
  border-radius: 22px;
  background: var(--sand-deep);
  box-shadow: inset 0 0 0 2px rgba(0, 0, 0, 0.1), 0 3px 0 var(--frame-dark);
  padding: 30px 22px 20px;
  margin: 40px 0;
}
.farm-frame-map { padding: 0; margin: 0; }
.plate {
  position: absolute;
  top: -12px;
  left: 22px;
  transform: translateY(-50%);
  background: var(--frame);
  color: #fff;
  font: 700 0.95rem/1 var(--display);
  padding: 8px 14px 9px;
  border-radius: 999px;
  box-shadow: 0 2px 0 var(--frame-dark);
  max-width: calc(100% - 44px);
}

/* ---------------------------------------------------------------- chapter */

.chapter {
  max-width: 1040px;
  margin: 0 auto;
  padding: 40px 24px 96px;
}
.ch-header {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 28px;
  align-items: start;
  margin-bottom: 36px;
}
.ch-header.plain { grid-template-columns: 1fr; }
.ch-num {
  font: 800 clamp(5rem, 13vw, 9rem)/0.8 var(--display);
  color: transparent;
  -webkit-text-stroke: 3px var(--tunnel);
  letter-spacing: -0.05em;
  padding-top: 6px;
}
.ch-of { margin: 0 0 4px; color: var(--ink-soft); font-size: 0.95rem; }
.ch-header h1 { font-size: clamp(2.2rem, 5vw, 3.5rem); font-weight: 800; letter-spacing: -0.025em; }
.ch-short { font-size: 1.2rem; margin: 8px 0 14px; color: var(--ink-soft); }
.ch-goals { font-size: 0.95rem; }
.checklist { list-style: none; padding: 0; margin: 6px 0 0; }
.checklist li { display: flex; gap: 8px; align-items: center; }
.checklist .box {
  width: 16px;
  height: 16px;
  border: 2px solid var(--ink-soft);
  border-radius: 4px;
  flex: none;
}
.checklist li.done .box { background: var(--frame); border-color: var(--frame); box-shadow: inset 0 0 0 3px var(--sand); }
.checklist li.done { color: var(--frame-dark); }

.ch-nav {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 64px;
  padding-top: 24px;
  border-top: 2px solid var(--sand-shade);
}

/* ---------------------------------------------------------------- prose */

.prose { max-width: var(--measure); }
.prose p, .prose ul, .prose ol { margin: 0 0 1em; }
.prose h2 {
  font-size: 1.9rem;
  font-weight: 800;
  margin: 2.2em 0 0.5em;
}
.prose h3 { font-size: 1.35rem; font-weight: 700; margin: 1.6em 0 0.4em; }
.prose li { margin-bottom: 0.35em; }
.prose strong { color: var(--ink); }
.prose code, .inline-code {
  font: 0.86em var(--mono);
  background: rgba(43, 28, 18, 0.08);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}
.prose code.aw { background: var(--sky-pale); color: #174f80; font-weight: 600; }
.prose .code code { background: none; padding: 0; }

.idea, .trap, .aside {
  max-width: var(--measure);
  margin: 1.4em 0;
  padding: 14px 18px;
  border-radius: 12px;
  border-left: 6px solid var(--frame);
  background: var(--frame-pale);
}
.idea p:last-child, .trap p:last-child, .aside p:last-child { margin-bottom: 0; }
.trap { border-left-color: var(--fire); background: var(--fire-pale); }
.aside { border-left-color: var(--sky); background: var(--sky-pale); }

.map-table { border-collapse: collapse; width: 100%; font-size: 0.95rem; margin: 1em 0 1.4em; }
.table-wrap { overflow-x: auto; max-width: 100%; }
.map-table th, .map-table td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--sand-shade); vertical-align: top; }
.map-table th { font-family: var(--display); font-weight: 700; }

/* ---------------------------------------------------------------- code */

pre.code {
  font: 14.5px/1.6 var(--mono);
  background: var(--soil);
  color: #f1e2c0;
  padding: 16px 18px;
  border-radius: 12px;
  overflow-x: auto;
  margin: 1.2em 0;
  max-width: 100%;
  position: relative;
}
pre.code[data-label]::before {
  content: attr(data-label);
  display: block;
  font: 700 0.8rem var(--body);
  color: #cfa866;
  margin-bottom: 8px;
}
.prose pre.code { max-width: calc(var(--measure) + 8ch); }
.t-k { color: #f0a857; }
.t-s { color: #b5d88f; }
.t-c { color: #a3907b; font-style: italic; }
.t-n { color: #f3cd72; }
.t-aw {
  color: #9fd4fb;
  font-weight: 600;
  background: rgba(95, 170, 230, 0.2);
  border-radius: 3px;
  box-shadow: 0 0 0 2px rgba(95, 170, 230, 0.2);
}

/* ---------------------------------------------------------------- farm view */

.farm-view { overflow-x: auto; }
.farm-svg { display: block; width: 100%; min-width: 480px; height: auto; max-height: 560px; }
.farm-svg .surface { fill: #cfe6f2; }
.farm-svg .grass { fill: var(--frame); }
.nest-spot ellipse { fill: #c79a58; }
.nest-spot text { font: 11px var(--body); fill: var(--ink-soft); }
.tunnel { fill: none; stroke: var(--sand-shade); stroke-width: 8; stroke-linecap: round; transition: opacity 0.3s; }
.tunnel.foreign { stroke: var(--wasp); stroke-width: 3; stroke-dasharray: 5 5; opacity: 0.6; }
.chamber .room { fill: var(--sand); stroke: var(--sand-dark); stroke-width: 2; stroke-dasharray: 4 3; transition: fill 0.3s, stroke 0.3s; }
.chamber .name { font: 12px var(--mono); fill: var(--ink-soft); }
.chamber .name.small { font-size: 10px; }
.chamber .scent { fill: var(--frame); opacity: 0; transition: opacity 0.3s; }
.chamber.st-seen .room { stroke-dasharray: none; stroke: var(--tunnel); fill: #f7ecd0; }
.chamber.st-seen .scent, .chamber.st-active .scent, .chamber.st-done .scent { opacity: 1; }
.chamber.st-active .room { fill: var(--sky-pale); stroke: var(--sky); stroke-width: 3; stroke-dasharray: none; }
.chamber.st-done .room { fill: var(--tunnel); stroke: var(--soil); stroke-dasharray: none; }
.chamber.st-done .name { fill: var(--ink); font-weight: 600; }
.chamber.foreign .room { fill: var(--wasp-pale); stroke: var(--wasp); stroke-dasharray: none; }
.chamber.foreign .name { fill: var(--wasp); }
.chamber.st-flash .room { animation: flash 0.7s; }
@keyframes flash { 0%, 100% { stroke-width: 2; } 40% { stroke: var(--fire); stroke-width: 6; } }
.hidden { opacity: 0; pointer-events: none; }
.chamber, .tunnel { transition: opacity 0.4s; }

.ant { transition: transform 0.55s ease-in-out, opacity 0.4s; }
.ant .flip { transition: transform 0.2s; }
.ant-name { font: 700 10px var(--body); }
.ant .zzz { font: 700 11px var(--body); fill: var(--wasp); opacity: 0; }
.ant.sleeping .zzz { opacity: 1; animation: zz 1.6s ease-in-out infinite; }
.ant.sleeping .glyph { opacity: 0.7; }
.ant.gone { opacity: 0; }
.ant.walking .legs { animation: legs 0.25s steps(2) infinite; }
.ant.thinking .glyph { filter: drop-shadow(0 0 3px var(--tunnel)); }
@keyframes legs { 50% { transform: scaleY(0.6); } }
@keyframes zz { 50% { transform: translateY(-4px); } }

.ant-icon { display: inline-block; vertical-align: middle; flex: none; }

/* ---------------------------------------------------------------- panels & chips */

.panel {
  background: var(--panel);
  border: 2px solid var(--sand-shade);
  border-radius: 12px;
  padding: 12px 14px;
}
.panel h4 { font-size: 1rem; margin-bottom: 6px; }
.slips { display: flex; flex-wrap: wrap; gap: 6px; min-height: 34px; padding: 0; margin: 0; list-style: none; }
.slip {
  font: 13px var(--mono);
  background: #fffaf0;
  border: 1px solid var(--sand-dark);
  border-radius: 4px;
  padding: 4px 8px;
  box-shadow: 1px 2px 0 rgba(0, 0, 0, 0.1);
}
.slip.empty { background: none; border-style: dashed; color: var(--ink-soft); box-shadow: none; }

.chips { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0; }
.chip {
  font: 14px var(--mono);
  padding: 7px 12px;
  border-radius: 8px;
  border: 2px solid var(--ink-soft);
  background: #fffaf0;
  color: var(--ink);
  cursor: pointer;
}
.chip:disabled { opacity: 0.35; cursor: default; }

.feedback { margin: 10px 0 0; min-height: 1.2em; }
.feedback.ok { color: var(--frame-dark); font-weight: 700; }
.feedback.no { color: var(--fire); }

.readout { margin: 12px 0 0; font-size: 1.02rem; }
.legend { display: flex; flex-wrap: wrap; gap: 16px; font-size: 0.88rem; margin-top: 10px; }
.key::before { content: ''; display: inline-block; width: 22px; height: 12px; border-radius: 3px; margin-right: 6px; vertical-align: -1px; }
.key.think::before { background: var(--ink); }
.key.walk::before { background: var(--sky); }
.key.queue::before { background: repeating-linear-gradient(45deg, var(--fire) 0 3px, transparent 3px 6px); border: 1px solid var(--fire); }

/* ---------------------------------------------------------------- timeline */

.controls { display: flex; flex-wrap: wrap; gap: 18px; align-items: center; margin-bottom: 14px; }
.slider { display: flex; align-items: center; gap: 10px; font-weight: 700; }
.slider input { width: 160px; accent-color: var(--frame); }
.toggles { display: flex; flex-wrap: wrap; gap: 8px; }
.timeline-chart { overflow-x: auto; }
.timeline-svg { width: 100%; min-width: 520px; height: auto; display: block; }
.timeline-svg .row-label { font: 700 13px var(--body); }
.timeline-svg .row-label.brain { fill: var(--tunnel); }
.lane { fill: rgba(255, 250, 235, 0.5); }
.brain-lane { fill: rgba(107, 68, 35, 0.15); }
.seg.think { fill: var(--ink); }
.seg.walk { fill: var(--sky); }
.seg.queue { fill: rgba(201, 58, 43, 0.25); stroke: var(--fire); stroke-width: 1; stroke-dasharray: 3 2; }
.tick { stroke: var(--ink-soft); }
.tick-label { font: 11px var(--body); fill: var(--ink-soft); }
.finish { stroke: var(--frame-dark); stroke-width: 2; stroke-dasharray: 4 3; }

/* ---------------------------------------------------------------- hand scout */

.scout-grid { display: grid; grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr); gap: 18px; }
.scout-side { display: flex; flex-direction: column; gap: 12px; }
.link-choices { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 8px; }
.link-choice {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  background: #fffaf0;
  border: 2px solid var(--sand-shade);
  border-radius: 10px;
  padding: 8px 10px;
}
.link-choice code { font: 14px var(--mono); flex: 1 1 140px; }
.link-choice.decided { opacity: 0.6; }
.link-choice.decided.queued { border-color: var(--frame); opacity: 1; }
.link-choice .verdict { font-size: 0.85rem; width: 100%; }
.scout-msg { font-size: 0.98rem; margin: 0; }
.scout-msg.bad { color: var(--fire); }
.scout-msg.good { color: var(--frame-dark); }
.stat-line { font-size: 0.9rem; color: var(--ink-soft); margin: 0; }

/* ---------------------------------------------------------------- scheduler */

.sched-goal {
  background: var(--panel);
  border: 2px dashed var(--fire);
  border-radius: 12px;
  padding: 10px 14px;
  margin-bottom: 14px;
}
.sched-goal.won { border: 2px solid var(--fire); background: var(--fire-pale); }
.sched-goal.won.safe { border-color: var(--frame); background: var(--frame-pale); }
.sched-goal p { margin: 6px 0 0; }
.try-again { font-size: 0.95rem; color: var(--ink-soft); }
.sched-grid { display: grid; grid-template-columns: minmax(0, 2.2fr) minmax(0, 1fr); gap: 16px; }
.sched-cols { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 12px; }
.sched-col { background: var(--panel); border: 2px solid var(--sand-shade); border-radius: 12px; padding: 10px; display: flex; flex-direction: column; gap: 8px; }
.sched-head { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.sched-status { font-size: 0.82rem; color: var(--ink-soft); flex-basis: 100%; }
.sched-code { list-style: none; margin: 0; padding: 8px 6px; background: var(--soil); border-radius: 8px; flex: 1; }
.sched-code .line { display: grid; grid-template-columns: 24px 1fr; align-items: center; font: 13px/1.5 var(--mono); color: #f1e2c0; padding: 2px 4px; border-radius: 5px; }
.sched-code .line code { white-space: pre-wrap; word-break: break-word; }
.sched-code .line.ran { opacity: 0.5; }
.sched-code .line.here { background: rgba(243, 228, 189, 0.16); opacity: 1; }
.sched-code .line.here.paused { background: rgba(95, 170, 230, 0.28); }
.sched-code .door { font: italic 11px var(--body); color: #9fd4fb; padding: 1px 4px 1px 28px; border-top: 1px dashed rgba(159, 212, 251, 0.5); margin: 3px 0; }
.sched-code.every-line .line + .line { border-top: 1px dashed rgba(159, 212, 251, 0.35); }
.sched-side h4 { font-size: 1rem; margin: 0 0 6px; }
.sched-state { background: var(--panel); border: 2px solid var(--sand-shade); border-radius: 12px; padding: 10px 12px; margin-bottom: 12px; font-size: 0.92rem; }
.sched-state p { margin: 0 0 6px; }
.sched-state code { font: 12.5px var(--mono); background: rgba(43, 28, 18, 0.08); padding: 1px 4px; border-radius: 3px; }
.sched-state .bad { color: var(--fire); font-weight: 700; }
.sched-log { font-size: 0.86rem; max-height: 220px; overflow-y: auto; margin: 0; padding-left: 28px; }
.why {
  background: var(--frame-pale);
  border-left: 6px solid var(--frame);
  border-radius: 10px;
  padding: 12px 16px;
  margin-top: 10px;
}
.why p:last-child { margin-bottom: 0; }

/* ---------------------------------------------------------------- event loop */

.el-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); gap: 16px; }
.el-pre { margin: 0; padding: 12px 8px; font-size: 13px; }
.el-code { margin: 0; padding-left: 2.2em; color: #a3907b; }
.el-code li { padding: 1px 6px; border-radius: 4px; }
.el-code li code { color: #f1e2c0; font: inherit; white-space: pre-wrap; overflow-wrap: anywhere; }
.el-code li.cur { background: rgba(243, 228, 189, 0.2); box-shadow: inset 3px 0 0 #f0a857; }
.el-note { margin: 12px 0 0; font-size: 0.98rem; min-height: 5em; }
.el-right { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; align-content: start; }
.el-panel { background: var(--panel); border: 2px solid var(--sand-shade); border-radius: 10px; padding: 8px 10px; }
.el-panel:first-child { grid-column: 1 / -1; border-color: var(--tunnel); }
.el-panel:last-child { grid-column: 1 / -1; }
.el-panel h4 { font-size: 0.95rem; }
.el-sub { font-size: 0.75rem; color: var(--ink-soft); margin: 0 0 6px; line-height: 1.3; }
.el-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 4px; }
.el-list li { font: 12.5px var(--mono); background: #fffaf0; border: 1px solid var(--sand-dark); border-radius: 5px; padding: 3px 7px; }
.el-list li.empty { background: none; border-style: dashed; color: var(--ink-soft); font-family: var(--body); }
.el-counter { font-size: 0.9rem; color: var(--ink-soft); }

.order-puzzle .hint-line { margin: 0; font-weight: 700; }
.order-answer { font: 14px var(--mono); margin: 6px 0; min-height: 1em; }

/* ---------------------------------------------------------------- quiz */

.quiz { padding-left: 1.4em; margin: 0; }
.question { margin-bottom: 22px; }
.question .q { font-weight: 700; margin-bottom: 8px; }
.question .q p { margin: 0 0 6px; }
.opts { display: flex; flex-direction: column; gap: 6px; }
.opt {
  text-align: left;
  font: 0.98rem/1.4 var(--body);
  padding: 9px 12px;
  border-radius: 10px;
  border: 2px solid var(--sand-dark);
  background: #fffaf0;
  color: var(--ink);
  cursor: pointer;
}
.opt:hover:not(:disabled) { border-color: var(--ink); }
.opt.right { border-color: var(--frame); background: var(--frame-pale); }
.opt.wrong { border-color: var(--fire); background: var(--fire-pale); }
.opt:disabled { cursor: default; }
.opt code, .question code { font: 0.9em var(--mono); }
.quiz-status { margin: 0; font-weight: 700; }
.quiz-status.ok { color: var(--frame-dark); }
.snap { display: grid; gap: 4px; font-size: 0.92rem; font-weight: 400; background: var(--panel); border: 2px solid var(--sand-shade); border-radius: 10px; padding: 8px 12px; margin-top: 6px; }

/* ---------------------------------------------------------------- challenge */

.challenge {
  margin: 44px 0;
  border: 3px solid var(--ink);
  border-radius: 16px;
  padding: 22px;
  background: #f8ecce;
  box-shadow: 6px 6px 0 var(--sand-shade);
}
.ch-head { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; flex-wrap: wrap; }
.ch-head h3 { font-size: 1.6rem; font-weight: 800; }
.badge { background: var(--frame); color: #fff; font-weight: 700; font-size: 0.8rem; padding: 3px 10px; border-radius: 999px; }
.ch-brief { margin-bottom: 14px; }

.editor {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  background: var(--soil);
  border-radius: 12px;
  overflow: hidden;
  font: 14.5px/1.6 var(--mono);
  border: 2px solid var(--soil);
}
.editor:focus-within { border-color: var(--sky); }
.ed-gutter { padding: 14px 10px 14px 12px; color: #7c6a58; text-align: right; white-space: pre; user-select: none; background: var(--soil-2); }
.ed-body { position: relative; min-width: 0; }
.ed-hl, .ed-input {
  margin: 0;
  padding: 14px 16px;
  font: inherit;
  white-space: pre;
  tab-size: 2;
  overflow-x: auto;
  overflow-y: hidden;
  border: 0;
  width: 100%;
  letter-spacing: 0;
}
.ed-hl { position: absolute; inset: 0; color: #f1e2c0; pointer-events: none; overflow: hidden; }
.ed-input {
  position: relative;
  display: block;
  background: transparent;
  color: transparent;
  caret-color: #fff;
  resize: none;
  outline: none;
  min-height: 120px;
}
.ed-input::selection { background: rgba(159, 212, 251, 0.35); }
.kbd-hint { font-size: 0.82rem; color: var(--ink-soft); }

.results { list-style: none; padding: 0; margin: 12px 0 0; display: flex; flex-direction: column; gap: 6px; }
.results li { display: grid; grid-template-columns: 26px 1fr; align-items: start; padding: 8px 10px; border-radius: 8px; background: rgba(255, 250, 235, 0.7); }
.results .mark { width: 18px; height: 18px; border-radius: 50%; margin-top: 3px; border: 2px solid var(--sand-dark); }
.results li.pending .mark { border-color: var(--sky); border-top-color: transparent; animation: spin 0.8s linear infinite; }
.results li.pass .mark { background: var(--frame); border-color: var(--frame); }
.results li.fail .mark { background: var(--fire); border-color: var(--fire); }
.results li.bonus .tname::after { content: ' (bonus)'; color: var(--ink-soft); }
.results .why { grid-column: 2; margin-top: 6px; background: var(--fire-pale); border-left-color: var(--fire); font-size: 0.95rem; }
@keyframes spin { to { transform: rotate(360deg); } }
.summary:empty { display: none; }
.summary { margin-top: 14px; padding: 12px 16px; border-radius: 10px; font-weight: 700; }
.summary.good { background: var(--frame); color: #fff; }
.summary.bad { background: var(--fire-pale); color: #7c1f14; }
.hints { display: flex; flex-direction: column; gap: 8px; }
.hint { background: var(--sky-pale); border-left: 6px solid var(--sky); border-radius: 10px; padding: 10px 14px; max-width: var(--measure); }
.hint code { font: 0.88em var(--mono); }
.console-wrap { margin-top: 12px; }
.console-wrap summary { cursor: pointer; font-weight: 700; }
.console { font: 13px/1.5 var(--mono); background: var(--soil); color: #f1e2c0; padding: 12px; border-radius: 10px; max-height: 240px; overflow: auto; white-space: pre-wrap; }
.console .log-error { color: #ff9c8c; }
.console .log-warn { color: #f3cd72; }
.confirm { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; background: #fffaf0; border: 2px solid var(--ink-soft); border-radius: 10px; padding: 10px 14px; margin: 10px 0; }
.solution { margin-top: 16px; }

.replay-controls { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-top: 10px; }
.replay-controls input { flex: 1 1 200px; accent-color: var(--frame); }
.clock { font: 13px var(--mono); color: var(--ink-soft); }
.gantt-wrap { overflow-x: auto; margin-top: 10px; }
.gantt { width: 100%; min-width: 480px; height: auto; display: block; }
.gantt .row-label { font: 700 11px var(--body); }
.gantt .cursor { stroke: var(--fire); stroke-width: 2; }

/* ---------------------------------------------------------------- stations (pool, nursery) */

.stations { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
.station { background: var(--panel); border: 2px solid var(--sand-shade); border-radius: 12px; padding: 10px; display: flex; flex-direction: column; gap: 4px; align-items: flex-start; transition: border-color 0.2s, background 0.2s; }
.station .st-name { font-weight: 700; display: flex; align-items: center; gap: 6px; }
.station .st-what { font-size: 0.86rem; color: var(--ink-soft); min-height: 2.6em; }
.station.working { border-color: var(--sky); background: var(--sky-pale); }
.station.pacing { border-color: var(--fire); }
.station.pacing.blink { background: var(--fire-pale); }
.station.asleep { border-color: var(--wasp); background: var(--wasp-pale); }
.station.woke-for-nothing { border-color: var(--fire); background: var(--fire-pale); }
.station.home { opacity: 0.45; border-style: dashed; }
.counters { display: flex; flex-wrap: wrap; gap: 12px; margin: 12px 0; }
.counter { background: var(--panel); border: 2px solid var(--sand-shade); border-radius: 12px; padding: 8px 14px; }
.counter strong { font: 800 1.6rem/1 var(--display); display: block; }
.counter.bad strong { color: var(--fire); }
.counter span { font-size: 0.85rem; color: var(--ink-soft); }
.board { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; min-height: 40px; }
.two-col { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 16px; align-items: start; }

/* ---------------------------------------------------------------- glossary */

.gloss { max-width: var(--measure); }
.gloss dt { font: 700 1.2rem var(--display); margin-top: 1.4em; display: flex; gap: 12px; align-items: baseline; flex-wrap: wrap; }
.gloss-ch { font: 0.85rem var(--body); }
.gloss dd { margin: 0.3em 0 0; }
.gloss dd code { font: 0.86em var(--mono); background: rgba(43, 28, 18, 0.08); padding: 0.1em 0.35em; border-radius: 4px; }

/* ---------------------------------------------------------------- responsive */

@media (max-width: 900px) {
  .home { grid-template-columns: 1fr; gap: 32px; padding-top: 28px; }
  .home-text { position: static; }
  .sched-grid, .el-grid, .scout-grid, .two-col { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  body { font-size: 17px; }
  .frame { border-width: 9px; padding: 28px 12px 14px; }
  .challenge { padding: 14px; }
  .ch-header { grid-template-columns: 1fr; gap: 8px; }
  .ch-num { font-size: 4rem; }
  .el-right { grid-template-columns: 1fr; }
  .chapter { padding-inline: 16px; }
  .topbar-progress { display: none; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ---------------------------------------------------------------- sequential vs together */

.bars { display: flex; flex-direction: column; gap: 6px; margin-top: 14px; }
.bar-row { display: grid; grid-template-columns: 9.5em minmax(0, 1fr); align-items: center; gap: 10px; }
.bar-row code { font: 13px var(--mono); }
.bar-track { height: 14px; background: rgba(255, 250, 235, 0.6); border: 1px solid var(--sand-dark); border-radius: 7px; overflow: hidden; }
.bar-fill { height: 100%; width: 0; background: var(--sky); }
.demo-notes { list-style: none; padding: 0; margin: 10px 0 0; font-size: 0.95rem; }
.demo-notes li { padding: 2px 0; }

.farm-svg .hidden { opacity: 0 !important; }
[tabindex='-1']:focus { outline: none; }

/* Code must show exactly what was typed: no => arrow ligatures. Declared
   last and !important because every `font` shorthand above resets it. */
code, pre, textarea, .slip, .chip, .editor * {
  font-variant-ligatures: none !important;
  font-feature-settings: 'liga' 0, 'calt' 0 !important;
}