/* ZendoRL: drafting-sheet design, light only. */
:root {
  --paper: #f4f2ec;
  --sheet: #fbfaf6;
  --ink: #1b2130;
  --muted: #555b69;
  --faint: #8a8e98;
  --line: #d6d2c6;
  --grid: rgba(47, 111, 214, 0.075);
  --code: #ebe8df;
  --accent: #2f6fd6;
  --accent-ink: #1b4794;
  --good: #1f7a45;
  --bad: #a3322b;
  --stone-white: #fbfaf6;
  --stone-black: #1b1b1d;
  --stone-edge: #3a3a40;
  --panel: #fffefa;
  --bubble: #ffffff;
  --halftone: rgba(27, 33, 48, 0.08);
  --tint: rgba(47, 111, 214, 0.1);
  --sans: "IBM Plex Sans", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --hand: Kalam, "Comic Sans MS", "Chalkboard SE", cursive;
  --pixel: "Press Start 2P", ui-monospace, monospace;
  --measure: 64ch;
  color-scheme: light;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 60px; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
}
/* Grid paper behind everything. */
body::before {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none;
  background-image: linear-gradient(var(--grid) 1px, transparent 1px), linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 24px 24px;
}
a { color: var(--accent-ink); text-underline-offset: 3px; }
a:hover { color: var(--accent); }
button { font: inherit; color: inherit; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
p { margin: 0 0 14px; text-wrap: pretty; }
ul, ol { padding-left: 1.3em; margin: 0 0 16px; }
li { margin: 4px 0; }
code, pre { font-family: var(--mono); }
p code, li code, td code, dd code, .note code { font-size: 0.88em; background: var(--code); padding: 1px 5px; }
pre { background: var(--code); padding: 12px 14px; overflow-x: auto; font-size: 13.5px; line-height: 1.5; margin: 0 0 14px; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.hand { font-family: var(--hand); }
.hatch { background: repeating-linear-gradient(45deg, var(--ink) 0 1px, transparent 1px 6px); }

.wrap { max-width: 1120px; margin: 0 auto; padding: 0 24px; }

/* Small caps labels, figure frames */
.label, .frame-head {
  font: 500 11px/1.4 var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted);
}
h3.label { margin: 56px 0 14px; }
.frame { border: 1.5px solid var(--ink); background: var(--sheet); margin: 0; min-width: 0; }
.frame-head {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 4px 12px;
  font-size: 10.5px; border-bottom: 1px solid var(--line); padding: 8px 12px;
}
.caption { margin: 12px 0 0; font-size: 14px; color: var(--muted); max-width: 72ch; }

/* Title sheet */
.title-sheet { padding: 48px 0 40px; }
.titlebar {
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 12px 16px;
  border-bottom: 1.5px solid var(--ink); padding-bottom: 12px;
}
.links { display: flex; flex-wrap: wrap; gap: 8px; margin-left: auto; }
.btn {
  display: inline-flex; align-items: center; padding: 6px 12px;
  font: 500 12.5px var(--mono); border: 1.5px solid var(--ink); color: var(--ink); background: var(--sheet); text-decoration: none;
}
a.btn[href]:hover { background: var(--ink); color: var(--paper); }
.btn[aria-current="page"] { background: var(--ink); color: var(--paper); }
.btn[aria-disabled="true"] { cursor: default; }
.hero { display: flex; flex-wrap: wrap; align-items: center; gap: 32px 48px; padding-top: 36px; }
.hero-text { flex: 1 1 480px; min-width: 0; }
/* Pixel title after ZendoBench's, in the sheet's blue: a hard stepped extrusion from accent to ink, no glow. */
h1 {
  font: 400 clamp(34px, 5.6vw, 64px)/1.15 var(--pixel); letter-spacing: 0.02em; color: var(--accent); margin: 0 0 26px;
  text-shadow:
    1px 1px 0 color-mix(in srgb, var(--accent) 60%, var(--accent-ink)),
    2px 2px 0 color-mix(in srgb, var(--accent) 30%, var(--accent-ink)),
    3px 3px 0 var(--accent-ink),
    4px 4px 0 color-mix(in srgb, var(--accent-ink) 60%, var(--ink)),
    5px 5px 0 color-mix(in srgb, var(--accent-ink) 30%, var(--ink)),
    6px 6px 0 var(--ink);
}
.hero-q { font-size: 20px; line-height: 1.5; margin: 0 0 16px; max-width: 34ch; }
.hero-lede { color: var(--muted); margin: 0; max-width: 52ch; }
.hero-fig { flex: 1 1 420px; padding: 10px; }
.hero-fig .frame-head { padding: 0 0 6px; }
svg.koan { display: block; width: 100%; height: auto; }
/* Side by side, the koan is a fixed width, a little taller than the text, which centres beside it. */
@media (min-width: 900px) {
  .hero { flex-wrap: nowrap; }
  .hero-fig { flex: 0 1 400px; }
  .hero-fig svg.koan text { font-size: 13px; } /* drawn at ~0.7 scale here */
}
svg.koan text { font: 500 11px var(--mono); fill: var(--ink); }
svg.koan .tray { fill: none; stroke: var(--faint); stroke-width: 1.2; stroke-dasharray: 5 4; }

/* Sticky section nav */
nav.toc {
  position: sticky; top: 0; z-index: 20;
  background: color-mix(in srgb, var(--paper) 90%, transparent);
  -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px);
  border-top: 1.5px solid var(--ink); border-bottom: 1px solid var(--line);
}
nav.toc .wrap { display: flex; align-items: center; gap: 16px; }
nav.toc ol { flex: 1; min-width: 0; display: flex; gap: 2px; list-style: none; margin: 0; padding: 8px 0; overflow-x: auto; white-space: nowrap; scrollbar-width: none; }
nav.toc ol::-webkit-scrollbar { display: none; }
nav.toc li { margin: 0; }
nav.toc a { display: flex; align-items: baseline; gap: 6px; padding: 5px 10px; font-size: 14px; color: var(--muted); text-decoration: none; }
nav.toc a:hover { color: var(--ink); }
nav.toc a.on { color: var(--ink); background: var(--tint); }
nav.toc .n { font: 500 11px var(--mono); color: var(--faint); }
.seg { flex: none; display: inline-flex; border: 1.5px solid var(--ink); background: var(--sheet); }
.seg button {
  font: 500 11px var(--mono); letter-spacing: 0.06em; text-transform: uppercase;
  padding: 6px 10px; border: 0; background: transparent; color: var(--ink); cursor: pointer;
}
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }

/* Sheets */
.sheet { padding: 72px 0 56px; }
.sheet + .sheet { border-top: 1.5px solid var(--ink); }
h2 { font: 600 clamp(30px, 4.2vw, 44px)/1.08 var(--sans); letter-spacing: -0.02em; margin: 8px 0 20px; max-width: 22ch; text-wrap: balance; }
.intro { max-width: var(--measure); margin-bottom: 32px; }
.intro > p:last-child { margin-bottom: 0; }
.split { display: flex; flex-wrap: wrap; align-items: flex-start; gap: 32px 56px; }
.split > * { flex: 1 1 380px; min-width: 0; }
.split > figure { flex-basis: 420px; }
.split > .questions-side { flex-basis: 420px; }
.prose p, .prose ul { max-width: 62ch; }

/* Cells separated by hairlines, whatever the wrap: each cell draws its right and bottom edge, the frame clips the outer ones. */
.cells-grid { overflow: hidden; }
.cells-grid > * { box-shadow: 1px 0 0 var(--line), 0 1px 0 var(--line); }

ol.questions {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  margin: 0; padding: 0; list-style: none; border: 1.5px solid var(--ink); background: var(--sheet);
}
ol.questions.stacked { grid-template-columns: 1fr; }
ol.questions li { margin: 0; padding: 18px 20px; display: flex; flex-direction: column; gap: 8px; }
ol.questions b { font-size: 18px; }
ol.questions li > span:last-child { color: var(--muted); font-size: 16px; }
.qn {
  width: 30px; height: 30px; border: 1.5px solid var(--ink); border-radius: 50%;
  display: grid; place-items: center; font: 600 12px var(--mono); color: var(--accent);
}

/* Tables in a frame */
.tframe { overflow-x: auto; border: 1.5px solid var(--ink); background: var(--sheet); }
.tframe table { border-collapse: collapse; width: 100%; font-size: 15.5px; }
.tframe th {
  text-align: left; vertical-align: bottom; padding: 10px 14px; border-bottom: 1.5px solid var(--ink);
  font: 500 11px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted);
}
.tframe td { padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
.tframe :is(td, th) + :is(td, th) { border-left: 1px solid var(--line); }
.tframe tbody tr:last-child > * { border-bottom: 0; }

/* Zendo: exploded piece */
.xp-body { display: flex; flex-wrap: wrap; }
.xp-fig { flex: 1 1 440px; min-width: 0; padding: 8px; }
.xp-stage { position: relative; max-width: 560px; margin: 0 auto; container-type: inline-size; }
.xp-stage svg { display: block; width: 100%; height: auto; }
.xp-stage .ink { fill: var(--ink); }
.xp-stage .leader { stroke: var(--ink); stroke-width: 1; }
.xp-stage .axis { stroke: var(--faint); stroke-width: 1; stroke-dasharray: 10 4 2 4; opacity: 0; transition: opacity 0.5s; }
.xp-stage .ghost { fill: var(--sheet); fill-opacity: 0.55; stroke: var(--ink); stroke-width: 1.5; stroke-linejoin: round; }
.xp-stage .dashed { stroke: var(--ink); stroke-width: 1; stroke-dasharray: 4 3; }
.xp-stage .outline { fill: none; stroke: var(--ink); stroke-width: 1.5; }
.xp-stage .solid { transition: opacity 0.45s; }
.xp-stage .layer { opacity: 0; transition: transform 0.7s cubic-bezier(0.3, 0.7, 0.2, 1), opacity 0.45s; }
.xp.exploded .axis, .xp.exploded .layer { opacity: 1; }
.xp.exploded .layer { transform: translateY(var(--dy)); }
.xp.exploded .solid, .xp.exploded .dim, .xp.exploded .pname { opacity: 0; }
.xp-stage .part {
  position: absolute; left: 66.5%; top: var(--y0); transform: translateY(-50%); pointer-events: none;
  font: 500 clamp(9px, 2.15cqi, 12px)/1.45 var(--mono); opacity: 0;
  transition: top 0.7s cubic-bezier(0.3, 0.7, 0.2, 1), opacity 0.45s;
}
.xp.exploded .part { top: var(--y1); opacity: 1; }
.xp-stage .part b { display: block; font-weight: 600; color: var(--accent); letter-spacing: 0.04em; }
.xp-stage .dim { position: absolute; transform: translate(-100%, -50%); padding-right: 8px; font: 500 clamp(9px, 2.15cqi, 12px) var(--mono); transition: opacity 0.45s; }
.xp-stage .pname {
  position: absolute; left: 0; width: 76%; top: 76%; text-align: center; transition: opacity 0.45s;
  font: 500 clamp(10px, 2.3cqi, 13px) var(--mono); text-transform: uppercase; letter-spacing: 0.06em;
}
.parts { flex: 1 1 340px; min-width: 0; border-left: 1px solid var(--line); display: flex; flex-direction: column; }
.parts > .frame-head { padding: 12px 16px; }
.part-row { padding: 14px 16px; border-bottom: 1px solid var(--line); display: grid; grid-template-columns: 28px minmax(0, 1fr) 28px; gap: 10px; align-items: start; }
.part-row .pn { font: 600 12px var(--mono); color: var(--accent); padding-top: 2px; }
.part-row .pl { font-weight: 600; margin-bottom: 8px; }
.part-row .px { font: 500 13px var(--mono); color: var(--muted); text-align: right; padding-top: 2px; }
.opts { display: flex; flex-wrap: wrap; gap: 6px; }
.opt {
  display: inline-flex; align-items: center; gap: 6px; padding: 4px 9px; cursor: pointer;
  font: 500 12.5px var(--mono); border: 1.5px solid var(--ink); background: var(--sheet); color: var(--ink);
}
.opt i { width: 10px; height: 10px; border: 1px solid var(--ink); }
.opt[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.parts-sum { padding: 14px 16px; display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 12px; font: 500 13px var(--mono); }
.parts-sum b { font: 600 18px var(--mono); }
.parts-note { margin-top: auto; padding: 12px 16px 16px; border-top: 1px solid var(--line); font-size: 14.5px; color: var(--muted); }
@media (max-width: 860px) {
  .parts { border-left: 0; border-top: 1px solid var(--line); }
}

/* Environment: spec, legend, note */
.spec-row { display: flex; flex-wrap: wrap; gap: 32px 48px; margin-top: 48px; }
.spec-row > :first-child { flex: 1 1 460px; min-width: 0; }
.spec-row > :last-child { flex: 1 1 300px; min-width: 0; display: flex; flex-direction: column; gap: 20px; }
.spec-row h3.label { margin: 0 0 12px; }
dl.spec { display: grid; grid-template-columns: max-content minmax(0, 1fr); margin: 0; border: 1.5px solid var(--ink); background: var(--sheet); }
dl.spec dt { padding: 11px 14px; border-bottom: 1px solid var(--line); font: 500 12px var(--mono); text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
dl.spec dd { margin: 0; padding: 10px 14px; border-bottom: 1px solid var(--line); border-left: 1px solid var(--line); }
dl.spec > :nth-last-child(-n + 2) { border-bottom: 0; }
.legend { display: flex; flex-direction: column; gap: 10px; padding: 14px; }
.legend div { display: flex; align-items: center; gap: 12px; }
/* Notes are <details>: closed, only the question shows; the answer opens below it. */
.note { border: 1.5px dashed var(--ink); background: var(--sheet); padding: 10px 16px; }
.note-title {
  display: flex; align-items: baseline; gap: 10px; cursor: pointer; list-style: none;
  font: 400 18px/1.3 var(--hand); color: var(--accent);
}
.note-title::-webkit-details-marker { display: none; }
.note-title::before { content: "+"; font: 600 15px var(--mono); }
.note[open] > .note-title::before { content: "−"; }
.note[open] > .note-title { margin-bottom: 10px; }
.note-title:hover { color: var(--accent-ink); }
.note-title:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; }
.note p { font-size: 16px; margin: 0; }

/* Stones and flat scenes */
svg.scene { display: block; overflow: visible; }
svg.scene .ground { stroke: var(--line); stroke-width: 1.5; }
svg.stone { flex: none; display: block; }
svg.stone circle { stroke: var(--stone-edge); stroke-width: 1.5; }
svg.stone.white circle { fill: var(--stone-white); }
svg.stone.black circle { fill: var(--stone-black); }
.pair { display: flex; align-items: center; gap: 8px; }

/* Zendo: the comic */
.game { margin-top: 64px; }
.game-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 16px; }
.game-title { font: 700 30px/1.15 var(--hand); margin: 8px 0 0; }
.game-rules { margin: 10px 0 0; max-width: 62ch; font-size: 16px; color: var(--muted); }
.game-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.gbtn {
  padding: 8px 14px; border: 1.5px solid var(--ink); background: var(--sheet); color: var(--ink); cursor: pointer;
  font: 500 12px var(--mono); text-transform: uppercase; letter-spacing: 0.06em;
}
.gbtn.primary { background: var(--ink); color: var(--paper); font-weight: 600; }
.gbtn:disabled { opacity: 0.4; cursor: default; }
.game-status { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); margin: 20px 0 22px; border: 1.5px solid var(--ink); background: var(--sheet); }
.game-status > div { padding: 12px 14px; }
.game-status .label { font-size: 10.5px; margin-bottom: 8px; }
.cells { display: grid; grid-template-columns: repeat(15, 1fr); gap: 3px; max-width: 260px; }
.cells span { aspect-ratio: 1; border: 1px solid var(--ink); }
.cells span.on { background: var(--accent); }
.subs { display: flex; gap: 8px; }
.subs span { width: 44px; height: 26px; border: 1.5px solid var(--ink); display: grid; place-items: center; font: 600 11px var(--mono); color: var(--paper); }
.subs .lose { background: var(--bad); }
.subs .win { background: var(--good); }
.struck { display: flex; flex-wrap: wrap; gap: 4px 10px; font: 16px/1.3 var(--hand); }
.struck s { text-decoration-thickness: 2px; text-decoration-color: var(--bad); color: var(--muted); }
.struck s.new { color: var(--ink); }
.struck .none { color: var(--faint); }
.game-status code { display: block; font: 500 12px/1.5 var(--mono); overflow-wrap: anywhere; }
.redacted { display: flex; flex-wrap: wrap; gap: 4px; padding-top: 4px; }
.redacted span { height: 12px; background: var(--ink); }

ol.panels { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 14px; list-style: none; margin: 0; padding: 0; }
.panel {
  position: relative; margin: 0; min-height: 340px; padding: 12px; cursor: pointer;
  display: flex; flex-direction: column; gap: 10px;
  border: 2.5px solid var(--ink); background-color: var(--panel);
  background-image: radial-gradient(var(--halftone) 1.1px, transparent 1.4px); background-size: 7px 7px;
  outline: 3px solid transparent; outline-offset: 3px; transition: outline-color 0.2s;
}
.panel.current { outline-color: var(--accent); }
.panel.closed { align-items: center; justify-content: center; gap: 6px; color: var(--faint); }
.panel.closed .q { font: 700 64px/1 var(--hand); }
.panel.closed .label { color: var(--faint); }
.ptag {
  align-self: flex-start; background: var(--sheet); border: 1.5px solid var(--ink); padding: 2px 8px;
  font: 600 10.5px var(--mono); letter-spacing: 0.06em; text-transform: uppercase;
}
.ptag.lose, .sfx.lose { color: var(--bad); }
.ptag.win, .sfx.win { color: var(--good); }
.sfx { position: absolute; top: 6px; right: 10px; font: 700 30px/1 var(--hand); transform: rotate(-8deg); letter-spacing: 0.02em; text-transform: uppercase; }
.bubble {
  align-self: flex-start; max-width: 90%; position: relative; margin-bottom: 8px; padding: 5px 12px 7px;
  background: var(--bubble); border: 2px solid var(--ink); border-radius: 16px;
}
.bubble.right { align-self: flex-end; }
.bubble.thought { border-style: dashed; border-radius: 22px; }
.bubble .who { font: 600 9.5px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.bubble .say { font: 400 17px/1.25 var(--hand); }
.bubble::after {
  content: ""; position: absolute; bottom: -8px; left: 22px; width: 13px; height: 13px;
  background: var(--bubble); border-right: 2px solid var(--ink); border-bottom: 2px solid var(--ink); transform: rotate(45deg);
}
.bubble.right::after { left: auto; right: 22px; }
.bubble.thought::after { bottom: -11px; width: 9px; height: 9px; border: 2px solid var(--ink); border-radius: 50%; transform: none; }
.panel code.rule { display: block; font: 500 11.5px/1.45 var(--mono); background: var(--sheet); border: 1.5px solid var(--ink); padding: 6px 8px; overflow-wrap: anywhere; }
.pscene { display: flex; align-items: flex-end; justify-content: center; gap: 12px; padding: 6px 0 2px; }
.pscene svg.scene .ground { stroke: var(--ink); stroke-width: 2; }
.pscene svg.stone { margin-bottom: 2px; }
.pcap { margin-top: auto; background: var(--sheet); border: 1.5px solid var(--ink); padding: 6px 9px; font-size: 13.5px; line-height: 1.4; }

/* Environment: stages of the environment */
.section-a { border: 1.5px solid var(--ink); padding: 14px; background: repeating-linear-gradient(45deg, var(--ink) 0 1px, transparent 1px 7px); }
.fig-top { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 4px 12px; margin-bottom: 6px; }
.chambers { display: grid; grid-template-columns: 1fr 18px 1fr 18px 1fr 18px 1fr 18px 1fr 18px 1fr; border: 1.5px solid var(--ink); }
.chamber {
  text-align: left; border: 0; padding: 14px 12px 16px; min-height: 170px; cursor: pointer;
  display: flex; flex-direction: column; gap: 6px; background: var(--sheet); color: var(--ink);
}
.chamber[aria-pressed="true"] { background: color-mix(in srgb, var(--accent) 16%, var(--sheet)); box-shadow: inset 0 0 0 2px var(--accent); }
.chamber .code { font: 600 11px var(--mono); color: var(--accent); }
.chamber .name { font: 700 15px var(--sans); letter-spacing: 0.02em; text-transform: uppercase; }
.chamber .short { font-size: 13.5px; line-height: 1.4; color: var(--muted); }
.chamber .stat { margin-top: auto; font: 500 12px var(--mono); }
.wall { display: flex; flex-direction: column; border-left: 1.5px solid var(--ink); border-right: 1.5px solid var(--ink); }
.wall::before, .wall::after { content: ""; flex: 1; background: repeating-linear-gradient(45deg, var(--ink) 0 1px, transparent 1px 5px); }
.wall span { height: 30px; display: grid; place-items: center; background: var(--sheet); border-top: 1.5px solid var(--ink); border-bottom: 1.5px solid var(--ink); font: 600 13px var(--mono); }
.wall span::before { content: "→"; }
@media (max-width: 960px) {
  .chambers { grid-template-columns: 1fr; }
  .chamber { min-height: 0; display: grid; grid-template-columns: 30px minmax(0, 1fr) auto; gap: 2px 10px; align-items: baseline; padding: 10px 12px; }
  .chamber .code { grid-row: span 2; }
  .chamber .short { grid-column: 2; }
  .chamber .stat { grid-column: 3; grid-row: 1; margin: 0; }
  .wall { flex-direction: row; height: 22px; border: 0; border-top: 1.5px solid var(--ink); border-bottom: 1.5px solid var(--ink); }
  .wall span { height: auto; width: 34px; border: 0; border-left: 1.5px solid var(--ink); border-right: 1.5px solid var(--ink); }
  .wall span::before { content: "↓"; }
}
.detail { margin-top: 18px; }
.detail-body { display: flex; flex-wrap: wrap; gap: 24px 40px; padding: 20px 20px 22px; }
.detail-body > :first-child { flex: 1 1 320px; min-width: 0; }
.detail-body > :first-child p { max-width: 52ch; }
.detail-body > :first-child p:last-child { margin-bottom: 0; }
.detail-body > :last-child { flex: 1 1 380px; min-width: 0; }
.detail .foot { margin: 10px 0 0; font-size: 14px; color: var(--muted); }
.tags { display: flex; flex-wrap: wrap; align-content: flex-start; gap: 8px; }
.tags span { padding: 5px 10px; border: 1.5px solid var(--ink); font: 500 12.5px var(--mono); }
.dedupe { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 8px 14px; align-items: center; font: 500 12px/1.45 var(--mono); }
.dedupe code { padding: 6px 8px; background: var(--code); overflow-wrap: anywhere; }
.dedupe code.gone { text-decoration: line-through; color: var(--muted); }
.catalog { display: flex; flex-direction: column; gap: 10px; }
.catalog > div { display: grid; grid-template-columns: 96px minmax(0, 1fr) 60px; gap: 10px; align-items: center; font: 500 12px var(--mono); }
.catalog > div > span:first-child { color: var(--muted); }
.catalog > div > span:last-child { text-align: right; }
.catalog .track { height: 16px; border: 1.5px solid var(--ink); }
.catalog .track i { display: block; height: 100%; background: var(--accent); }
.catalog .sum { display: flex; justify-content: flex-end; font: 600 13px var(--mono); border-top: 1px solid var(--line); padding-top: 8px; }
/* Train, dev and sealed rules, widths to scale (dev kept wide enough for its label). */
.splitbar { display: grid; grid-template-columns: minmax(0, 1691fr) minmax(52px, 230fr) minmax(0, 890fr); border: 1.5px solid var(--ink); font: 500 12px var(--mono); text-transform: uppercase; letter-spacing: 0.04em; }
.splitbar > div { padding: 12px 8px; min-width: 0; }
.splitbar > div + div { border-left: 1.5px solid var(--ink); }
.splitbar b { display: block; font: 600 16px var(--mono); letter-spacing: 0; }
.splitbar .hatch span { display: inline-block; background: var(--sheet); padding: 0 4px; }
.episode { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); border: 1.5px solid var(--ink); text-align: center; }
.episode > div { padding: 12px 8px; }
.episode > div + div { border-left: 1px solid var(--line); }
.episode b { display: block; font: 600 24px var(--mono); }
.episode span { font: 500 10.5px var(--mono); text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.grader { display: grid; grid-template-columns: minmax(0, 1fr) 28px minmax(0, 1fr); align-items: center; font: 500 12px var(--mono); text-transform: uppercase; letter-spacing: 0.04em; }
.grader > div { display: flex; flex-direction: column; gap: 8px; }
.grader > div > span { border: 1.5px solid var(--ink); padding: 8px 10px; }
.grader .join { align-self: stretch; margin: 18px 0; border: 1.5px solid var(--ink); border-left: 0; }
.grader > div:last-child { padding-left: 10px; }
.grader .good { border-color: var(--good); color: var(--good); }
.grader .unscored { border-style: dashed; border-color: var(--muted); color: var(--muted); }

.lang-row { display: flex; flex-wrap: wrap; gap: 32px 48px; margin-top: 56px; }
.lang-row > :first-child { flex: 1 1 520px; min-width: 0; }
.lang-row > :last-child { flex: 1 1 320px; min-width: 0; }
.lang-row h3.label { margin: 0 0 14px; }
.lang-row p { font-size: 16px; }
.anatomy-frame { padding: 22px 18px 18px; overflow-x: auto; }
.anatomy { display: flex; gap: 6px; align-items: flex-start; min-width: 620px; font: 500 14px var(--mono); }
.anatomy > div { display: flex; flex-direction: column; align-items: stretch; gap: 6px; }
.anatomy code { white-space: nowrap; }
.anatomy .q { color: var(--accent); }
.anatomy .end { color: var(--faint); }
.anatomy .brace { height: 8px; border: 1.5px solid var(--ink); border-top: 0; }
.anatomy .what { font: 500 10px var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); text-align: center; }

.tracks { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(100%, 340px), 1fr)); gap: 14px; margin-bottom: 26px; }
.tracks .body { padding: 14px 16px 16px; }
.tracks p { font-size: 15.5px; }
.tracks pre { font-size: 12.5px; margin: 0; }
.tracks pre.wrap-pre { white-space: pre-wrap; overflow-wrap: anywhere; }
ol.steps { list-style: none; padding: 0; margin: 0; font-size: 14px; }
ol.steps li { background: var(--code); padding: 6px 10px; margin: 0; overflow-wrap: anywhere; }
ol.steps li + li { margin-top: 18px; position: relative; }
ol.steps li + li::before { content: "↓"; position: absolute; top: -19px; left: 14px; color: var(--faint); }
ol.steps .label { margin-right: 6px; }
ol.steps code { font-size: 12.5px; background: none; padding: 0; }
.note.why { max-width: 820px; margin-bottom: 14px; }

/* Environment: tier ladder */
.ladder-frame { display: flex; flex-wrap: wrap; }
.ladder {
  flex: 1 1 420px; min-width: 0; padding: 20px 18px 12px; border-right: 1px solid var(--line);
  display: grid; grid-template-columns: repeat(6, minmax(0, 1fr)); gap: 10px; align-items: end;
}
.rung { border: 0; background: none; padding: 0; cursor: pointer; display: flex; flex-direction: column; align-items: stretch; gap: 6px; color: var(--ink); }
.rung .c { font: 500 11px var(--mono); color: var(--muted); text-align: center; }
.rung .bar { display: flex; flex-direction: column; border: 1.5px solid var(--ink); outline: 2px solid transparent; outline-offset: 3px; }
.rung .bar i { flex: 1; background: var(--accent); }
.rung .t { font: 600 13px var(--mono); text-align: center; border-top: 1.5px solid var(--ink); padding-top: 6px; }
.rung[aria-pressed="true"] .bar { outline-color: var(--accent); }
.rung[aria-pressed="true"] .t { color: var(--accent); }
.tier-card { flex: 1 1 340px; min-width: 0; padding: 18px; display: flex; flex-direction: column; gap: 10px; }
.tier-card .top { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.tier-card .top b { font: 700 18px var(--mono); }
.tier-card .top span, .tier-card .count { font: 500 12px var(--mono); color: var(--muted); }
.tier-card .what-t { font-size: 14px; color: var(--muted); }
.tier-card .nl { font-weight: 600; font-size: 18px; }
.tier-card code { font: 500 12px/1.5 var(--mono); color: var(--muted); overflow-wrap: anywhere; }
.tier-card .scenes { display: flex; flex-direction: column; gap: 6px; }
.tier-card .count { margin-top: auto; border-top: 1px solid var(--line); padding-top: 8px; }
@media (max-width: 860px) {
  .ladder { border-right: 0; border-bottom: 1px solid var(--line); }
}

/* Results */
.exp-title { font: 600 18px var(--sans); margin: 32px 0 12px; }
table.results { min-width: 760px; font-size: 14.5px; }
table.results th { letter-spacing: 0.06em; white-space: nowrap; padding: 10px 12px; }
table.results td { padding: 10px 12px; }
table.results .num { text-align: right; }
table.results .headline { background: var(--tint); }
table.results td.empty { text-align: center; padding: 44px 12px; background: none; }
.ci { display: block; font-size: 12px; color: var(--faint); }
table.results td .ci { white-space: nowrap; }
.exp-intro { max-width: 72ch; margin: 0 0 16px; font-size: 16px; }
/* The model column stays put while a narrow screen scrolls the numbers. */
table.results :is(td, th):first-child { position: sticky; left: 0; z-index: 1; background: var(--sheet); box-shadow: 1px 0 0 var(--line); }
table.results td.arm { min-width: 150px; }
@media (max-width: 600px) {
  table.results td.arm { min-width: 0; width: 128px; max-width: 128px; font-size: 13.5px; overflow-wrap: anywhere; }
  table.results :is(td, th):first-child { padding-left: 10px; padding-right: 10px; }
  /* The table scrolls wider than the screen: keep an empty table's stamp where it can be seen. */
  table.results td.empty { text-align: left; }
}
/* T1 is diagnostic: shown, never in the headline. */
table.results :is(th, td).diag { color: var(--muted); }
table.results th .ci { font-size: 10px; }
table.results tr.dev-pending td.pend { vertical-align: middle; text-align: center; font: 500 11px var(--mono); letter-spacing: 0.14em; text-transform: uppercase; color: var(--faint); }
/* How they played: column headers wrap, each with an i button. */
table.results.played th { white-space: normal; min-width: 96px; }
.th-i { display: flex; align-items: flex-end; justify-content: flex-end; gap: 6px; }
/* The i button: a small circle, with a larger invisible target around it. */
button.info {
  position: relative; flex: none; display: inline-grid; place-items: center; width: 16px; height: 16px; padding: 0;
  border: 1.5px solid var(--accent); border-radius: 50%; background: none; color: var(--accent);
  font: 600 10px/1 var(--mono); text-transform: none; letter-spacing: 0; cursor: pointer;
}
button.info::after { content: ""; position: absolute; inset: -8px; }
button.info:hover { background: var(--accent); color: var(--sheet); }
/* A column's text: a popover over the page, placed under its i button by main.js. */
.col-info {
  position: fixed; inset: auto; margin: 0; width: min(340px, calc(100vw - 32px)); padding: 12px 14px;
  border: 1.5px solid var(--ink); background: var(--sheet); color: var(--ink); font-size: 14.5px; line-height: 1.5;
  box-shadow: 3px 3px 0 var(--halftone);
}
.col-info:not([data-placed]) { visibility: hidden; }
.col-info b { display: block; margin-bottom: 8px; font: 500 11px/1.4 var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.col-info .dir { display: inline-block; margin-right: 6px; padding: 0 6px; border: 1.5px solid var(--accent); color: var(--accent); font: 600 10.5px/1.7 var(--mono); text-transform: uppercase; letter-spacing: 0.06em; white-space: nowrap; }

/* How they played: a chart of the measures (default) or the table. */
.played-fig .tframe { border: 0; }
.pl-chart { padding: 14px 16px 16px; }
.pl-tools { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 10px; margin-bottom: 14px; }
.pl-pick { display: grid; gap: 8px; margin-bottom: 16px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
.pl-presets, .pl-group { display: flex; flex-wrap: wrap; align-items: center; gap: 6px; }
.pl-presets .label { margin-right: 4px; }
.pl-preset, .pl-gbtn, .chip { font: 500 12px var(--mono); padding: 4px 9px; border: 1.5px solid var(--line); background: var(--panel); color: var(--muted); cursor: pointer; }
.pl-preset:hover, .pl-gbtn:hover, .chip:hover { border-color: var(--ink); color: var(--ink); }
.pl-gbtn { min-width: 118px; text-align: left; font-size: 11px; letter-spacing: 0.06em; text-transform: uppercase; border-color: var(--ink); color: var(--ink); }
.pl-gbtn[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.pl-gbtn[aria-pressed="mixed"] { background: var(--tint); }
.chip { display: inline-flex; align-items: center; gap: 7px; }
.chip i { flex: none; width: 10px; height: 10px; border: 1.5px solid var(--faint); }
.chip[aria-pressed="true"] { border-color: var(--c); color: var(--ink); }
.chip[aria-pressed="true"] i { background: var(--c); border-color: var(--c); }
/* On a phone each group is one row that scrolls sideways. */
@media (max-width: 640px) { .pl-group { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: none; } .pl-gbtn, .chip { flex: none; } .pl-gbtn { min-width: 0; } }
.pl-stage { position: relative; }
.pl-plot svg { display: block; overflow: visible; font: 500 11px var(--mono); }
.pl-plot svg text { fill: var(--muted); paint-order: stroke; stroke: var(--sheet); stroke-width: 3px; stroke-linejoin: round; }
.pl-plot .axis { stroke: var(--ink); stroke-width: 1.5; }
.pl-plot .grid { stroke: var(--line); }
.pl-plot .tk { stroke: var(--ink); }
.pl-plot .ctx { stroke: var(--faint); fill: var(--faint); opacity: 0.6; }
.pl-plot .hit { stroke: transparent; stroke-width: 12; fill: none; }
.pl-plot g[style] circle { fill: var(--c); stroke: var(--sheet); stroke-width: 2; }
.pl-plot g[style] text { fill: var(--c); font-weight: 600; }
.pl-plot g[style] .ln { fill: none; stroke: var(--c); stroke-width: 2.5; stroke-linejoin: round; }
.pl-plot g[style] .lead { stroke: var(--c); stroke-width: 1; opacity: 0.5; }
.pl-plot .title { fill: var(--ink); font-weight: 600; }
.pl-plot .cross { stroke: var(--ink); stroke-dasharray: 3 3; }
.pl-plot [data-m] { transition: opacity 0.12s; }
.pl-plot .dim { opacity: 0.12; }
.pl-row { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 16px; align-items: center; padding: 8px 0; border-top: 1px solid var(--line); }
.pl-row:first-child { border-top: 0; padding-top: 0; }
.pl-name { font: 600 14px/1.35 var(--sans); }
.pl-name button.info { vertical-align: 1px; margin-left: 4px; }
.pl-dir { display: block; margin-top: 2px; font: 500 10.5px var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--faint); }
@media (max-width: 640px) { .pl-row { grid-template-columns: minmax(0, 1fr); gap: 4px; } }
.pl-axes { display: flex; flex-wrap: wrap; gap: 8px 16px; margin-bottom: 10px; font: 500 11px var(--mono); letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.pl-axes select { margin-left: 6px; font: 500 12px var(--mono); text-transform: none; letter-spacing: 0; border: 1.5px solid var(--ink); background: var(--sheet); color: var(--ink); padding: 3px 4px; max-width: 100%; }
.pl-tip { position: absolute; z-index: 5; pointer-events: none; max-width: 380px; padding: 7px 10px; background: var(--ink); color: var(--paper); font: 500 12px/1.5 var(--mono); white-space: pre-line; }
.pl-note { margin: 12px 0 0; font-size: 14px; color: var(--muted); max-width: 80ch; }
.pl-empty { margin: 24px 0; font: 500 12px var(--mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--faint); text-align: center; }

/* Fig. 3A: the dev games */
.devgames { margin-top: 0; }
.dg-matrix { overflow-x: auto; padding: 14px 16px 10px; border-bottom: 1px solid var(--line); }
table.dg-table { border-collapse: collapse; font: 500 11px var(--mono); }
table.dg-table th { font-weight: 600; letter-spacing: 0.06em; color: var(--muted); padding: 0 0 6px; text-align: center; }
table.dg-table tbody th {
  text-align: left; padding: 3px 14px 3px 0; white-space: nowrap; color: var(--ink); font: 500 12.5px var(--sans); letter-spacing: 0;
}
table.dg-table tbody th span { display: block; font: 500 10px var(--mono); color: var(--faint); }
table.dg-table tbody th { position: sticky; left: 0; z-index: 1; background: var(--sheet); }
table.dg-table td { padding: 2px; }
table.dg-table tr.dg-band th { text-align: left; padding: 0 2px 6px; }
table.dg-table tbody + tbody tr.dg-band th { padding-top: 14px; }
/* The gap between tiers and the size of the squares are set by main.js to fill the frame. */
table.dg-table :is(td, th).rstart { padding-left: var(--gap, 14px); }
table.dg-table .dg-cell { width: var(--cell, 18px); height: var(--cell, 18px); }
table.dg-table th.dg-tier { position: static; padding: 0 0 6px; background: none; text-align: center; white-space: nowrap; font: 600 11px var(--mono); letter-spacing: 0.06em; color: var(--muted); }
table.dg-table tbody + tbody th.dg-tier { padding-top: 18px; }
@media (max-width: 600px) {
  .dg-matrix { padding: 12px 10px 8px; }
  table.dg-table td { padding: 1.5px; }
  /* One line for the model and one for the harness, cut short if need be. */
  table.dg-table tbody th[scope="row"] { width: 110px; max-width: 110px; padding-right: 6px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: 11px; line-height: 1.25; }
  table.dg-table tbody th[scope="row"] span { overflow: hidden; text-overflow: ellipsis; }
}
table.dg-table td.num { padding-left: 14px; text-align: right; color: var(--muted); }
.dg-cell { display: block; width: 18px; height: 18px; padding: 0; border: 1.5px solid var(--ink); cursor: pointer; }
.dg-cell.win { background: var(--good); border-color: var(--good); }
.dg-cell.loss { background: var(--sheet); border-color: var(--bad); }
.dg-cell.none { border-style: dashed; border-color: var(--faint); cursor: default; }
.dg-cell[aria-pressed="true"] { outline: 2.5px solid var(--accent); outline-offset: 2px; }
.dg-key { display: flex; gap: 18px; margin-top: 8px; font: 500 11px var(--mono); color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.dg-key span { display: flex; align-items: center; gap: 6px; }
.dg-key .dg-cell { width: 12px; height: 12px; cursor: default; }
.dg-game { padding: 16px; }
.dg-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 12px; flex-wrap: wrap; }
.dg-title { font: 600 22px/1.2 var(--sans); margin: 6px 0 0; }
.dg-title span { font: 500 12px var(--mono); color: var(--muted); margin-left: 6px; }
.dg-verdict { font: 700 26px/1 var(--hand); text-transform: uppercase; transform: rotate(-4deg); padding: 2px 10px; border: 2.5px solid currentColor; }
.dg-verdict.win { color: var(--good); }
.dg-verdict.loss { color: var(--bad); }
.dg-stats { display: grid; grid-template-columns: minmax(0, 2.4fr) repeat(var(--n, 3), minmax(0, 1fr)); margin: 14px 0; border: 1.5px solid var(--ink); background: var(--panel); }
.dg-stats > div { padding: 10px 12px; }
.dg-stats .label { font-size: 10px; margin-bottom: 4px; }
.dg-stats b { font: 600 20px var(--mono); }
.dg-stats small { font: 500 12px var(--mono); color: var(--muted); }
.dg-truth code { display: block; font: 500 12px/1.5 var(--mono); overflow-wrap: anywhere; }
.dg-nl { font-size: 13.5px; color: var(--muted); margin-top: 4px; }
@media (max-width: 720px) { .dg-stats { grid-template-columns: repeat(var(--n, 3), minmax(0, 1fr)); } .dg-truth { grid-column: 1 / -1; } }
.dg-chart-label { font-size: 10px; margin-bottom: 4px; }
svg.dg-chart { display: block; width: 100%; height: auto; max-width: 760px; margin-bottom: 14px; font: 500 10px var(--mono); }
svg.dg-chart text { fill: var(--muted); }
svg.dg-chart .grid { stroke: var(--line); }
svg.dg-chart polyline { fill: none; stroke: var(--accent); stroke-width: 2; }
svg.dg-chart circle { fill: var(--accent); }
svg.dg-chart .win line { stroke: var(--good); stroke-width: 1.5; stroke-dasharray: 4 3; }
svg.dg-chart .loss line { stroke: var(--bad); stroke-width: 1.5; stroke-dasharray: 4 3; }
svg.dg-chart .win text { fill: var(--good); }
svg.dg-chart .loss text { fill: var(--bad); }
ol.dg-moves { display: grid; grid-template-columns: repeat(auto-fill, minmax(168px, 1fr)); gap: 10px; list-style: none; margin: 0; padding: 0; }
.dg-move {
  position: relative; margin: 0; padding: 8px; display: flex; flex-direction: column; gap: 6px;
  border: 1.5px solid var(--ink); background: var(--panel); min-width: 0;
}
.dg-move .ptag { font-size: 9.5px; }
.dg-move .pscene { padding: 2px 0 0; gap: 8px; }
.dg-move.sub { border-width: 2.5px; }
.dg-move.sub .sfx { font-size: 20px; top: 4px; right: 8px; }
.dg-move.cx { border-style: dashed; }
.dg-move.invalid { border-color: var(--bad); border-style: dashed; }
.dg-move code.rule { display: block; font: 500 11px/1.45 var(--mono); background: var(--sheet); border: 1px solid var(--line); padding: 5px 6px; overflow-wrap: anywhere; }
.dg-foot { margin-top: auto; font: 500 11px/1.4 var(--mono); color: var(--muted); }
.dg-move.flat .dg-foot { color: var(--faint); }
.dg-foot .bad, .dg-invalid { color: var(--bad); }
.dg-invalid { margin: 0; font-size: 13.5px; overflow-wrap: anywhere; }
@media (max-width: 600px) {
  svg.dg-chart { font-size: 18px; }
  ol.dg-moves { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .dg-move .pscene { gap: 4px; }
  .dg-move .pscene svg.scene { max-width: 100%; height: auto; }
  .dg-move.sub .sfx { position: static; align-self: flex-end; margin: -2px 0 -4px; font-size: 17px; }
}

.pending-stamp {
  display: inline-block; padding: 8px 16px; border: 2.5px solid var(--muted); color: var(--muted); transform: rotate(-3deg);
  font: 700 14px var(--mono); letter-spacing: 0.14em; text-transform: uppercase;
}

/* Lab log */
.log-empty { border: 1.5px dashed var(--ink); padding: 28px; text-align: center; font: 500 13px var(--mono); letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
ol.log { list-style: none; padding: 0; margin: 0; }
ol.log > li { border: 1.5px solid var(--ink); background: var(--sheet); padding: 14px 16px; margin: 0 0 12px; }
ol.log .id { font: 700 13px var(--mono); color: var(--accent); margin-right: 8px; }
ol.log .date { font: 500 12px var(--mono); color: var(--faint); }
ol.log .exp { font: 600 11px var(--mono); text-transform: uppercase; letter-spacing: 0.06em; padding: 1px 6px; border: 1.5px solid var(--ink); }
ol.log dl { display: grid; grid-template-columns: max-content minmax(0, 1fr); gap: 4px 14px; margin: 8px 0 0; font-size: 15px; }
ol.log dt { font: 500 11px/2 var(--mono); text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
ol.log dd { margin: 0; }

/* Title block */
footer { padding: 24px 0 56px; }
.titleblock { display: grid; grid-template-columns: repeat(auto-fit, minmax(170px, 1fr)); border: 1.5px solid var(--ink); background: var(--sheet); }
.titleblock > div { padding: 10px 14px; }
.titleblock .label { font-size: 10px; color: var(--faint); }
.titleblock b { font-weight: 600; }
footer p { margin: 12px 0 0; font-size: 14px; color: var(--muted); }

@media (max-width: 720px) {
  .wrap { padding: 0 16px; }
  .sheet { padding: 56px 0 44px; }
  h3.label { margin-top: 44px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .xp-stage *, .panel { transition: none !important; }
}