@import url('https://fonts.googleapis.com/css2?family=Archivo:wdth,wght@62..125,400..800&family=Martian+Mono:wdth,wght@75..112.5,400..600&display=swap');

/* An engineer's computation pad: green paper, a 5-square grid, ink, and a red checking pencil for the ant. */
:root {
  color-scheme: light;
  --paper: #e3ecd9;
  --paper-light: #eef4e8;
  --rule: #a9c69c;
  --ink: #17241d;
  --graphite: #56645a;
  --red: #c8322a;
  --sans: "Archivo", "Arial Narrow", system-ui, sans-serif;
  --mono: "Martian Mono", ui-monospace, monospace;
}
* { box-sizing: border-box; }
html { min-width: 320px; background: var(--paper); }
body {
  margin: 0; color: var(--ink); font: 15px/1.5 var(--sans);
  background: var(--paper);
  min-height: 100vh;
}
button, input { font: inherit; color: inherit; }
button { cursor: pointer; }
button:focus-visible, input:focus-visible, canvas:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; }

.app-shell { max-width: 1560px; margin: 0 auto; padding: 0 32px 32px; }

/* Top bar */
.topbar { height: 66px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: inline-flex; align-items: center; gap: 10px; color: var(--ink); text-decoration: none; font-weight: 800; font-stretch: 125%; font-size: 15px; letter-spacing: .02em; text-transform: uppercase; }
.brand-mark { width: 20px; height: 20px; display: grid; grid-template-columns: 1fr 1fr; border: 2px solid var(--ink); }
.brand-mark span { background: var(--paper-light); }
.brand-mark span:nth-child(1), .brand-mark span:nth-child(4) { background: var(--ink); }
.brand-mark span:nth-child(2) { background: var(--red); }
.topnav { display: flex; gap: 4px; margin: 0 auto 0 28px; }
.topnav a { padding: 4px 10px; border: 1.5px solid transparent; color: var(--ink); text-decoration: none; font-weight: 700; font-stretch: 75%; font-size: 13px; letter-spacing: .08em; text-transform: uppercase; }
.topnav a:hover { color: var(--red); }
.topnav a[aria-current="page"] { border-color: var(--ink); background: var(--paper-light); }
.topbar-meta { display: flex; align-items: center; gap: 8px; font: 500 11px var(--mono); letter-spacing: .06em; color: var(--graphite); background: var(--paper-light); border: 1px solid var(--rule); padding: 5px 10px; }
.live-dot { width: 7px; height: 7px; background: var(--red); border-radius: 50%; display: inline-block; }

/* Intro */
.intro { display: grid; grid-template-columns: minmax(0, 1fr) 270px 330px; align-items: end; gap: 40px; padding: 14px 0 24px; }
h1 { margin: 0; line-height: .88; letter-spacing: -.02em; font-size: clamp(42px, 5.2vw, 76px); }
.h1-wide { font-weight: 800; font-stretch: 125%; }
.h1-narrow { display: block; font-weight: 400; font-stretch: 62%; letter-spacing: -.01em; color: var(--graphite); }
.intro-copy { max-width: 470px; margin: 18px 0 0; font-size: 15px; line-height: 1.6; background: var(--paper-light); padding: 10px 12px; border-left: 3px solid var(--red); }
.facts { border-left: 2px solid var(--ink); padding-left: 18px; }
.facts dl { margin: 0; display: flex; flex-direction: column; gap: 12px; }
.fact dt { font-size: 20px; font-weight: 500; line-height: 1.1; }
.fact dd { margin: 2px 0 0; font-size: 13px; line-height: 1.4; color: var(--graphite); }
.facts-link { display: inline-block; margin-top: 14px; font-size: 14px; font-weight: 700; color: var(--red); text-underline-offset: 3px; }
.rule-card { margin: 0; background: var(--paper-light); border: 2px solid var(--ink); }
.rule-row { display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 10px 14px; border-bottom: 1px solid var(--ink); }
.rule-row dt { display: flex; align-items: center; gap: 10px; font-size: 14px; }
.rule-row dd { margin: 0; font-weight: 700; font-stretch: 75%; font-size: 17px; text-transform: uppercase; letter-spacing: .02em; }
.rule-arrow { color: var(--red); font-size: 19px; margin-right: 4px; font-stretch: 100%; }
.swatch { width: 16px; height: 16px; border: 1.5px solid var(--ink); display: inline-block; }
.swatch-white { background: var(--paper-light); }
.swatch-black { background: var(--ink); }
.rule-foot { padding: 8px 14px; font-size: 13px; color: var(--graphite); }

/* Workspace */
.workspace { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 18px; align-items: start; }
.canvas-panel, .control-panel { border: 2px solid var(--ink); background: var(--paper-light); min-width: 0; }
.panel-head { min-height: 58px; border-bottom: 2px solid var(--ink); display: flex; justify-content: space-between; align-items: center; gap: 12px; padding: 8px 12px 8px 16px; }
.panel-title { display: flex; flex-direction: column; gap: 2px; }
.panel-kicker, .block-label { font-weight: 700; font-stretch: 75%; font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink); }
.panel-subtitle { font-size: 13px; color: var(--graphite); }
.canvas-tools { display: flex; align-items: center; gap: 4px; }
.icon-button { height: 32px; min-width: 32px; padding: 0 6px; border: 1.5px solid var(--ink); background: var(--paper-light); border-radius: 2px; font-size: 17px; line-height: 1; transition: background .12s, color .12s; }
.icon-button:hover { background: var(--paper); }
.icon-button.active { background: var(--red); border-color: var(--red); color: var(--paper-light); }
.icon-button:disabled { opacity: .35; cursor: default; background: var(--paper-light); }
.zoom-label { font-size: 11px; color: var(--graphite); min-width: 46px; text-align: center; }
.tool-divider { width: 1px; height: 22px; background: var(--rule); margin: 0 6px; }
.toolbar-speed { width: 90px; accent-color: var(--red); cursor: pointer; }

.canvas-wrap { height: clamp(400px, calc(100vh - 400px), 680px); position: relative; overflow: hidden; background: #e8f0df; cursor: grab; touch-action: none; }
.canvas-wrap.dragging { cursor: grabbing; }
.canvas-wrap.pen-mode { cursor: crosshair; }
#world { display: block; width: 100%; height: 100%; }
.canvas-hud { position: absolute; pointer-events: none; display: flex; }
.hud-bottom-left { left: 14px; bottom: 14px; align-items: center; gap: 8px; background: var(--paper-light); border: 1.5px solid var(--ink); padding: 5px 10px 5px 6px; }
.hud-bottom-right { right: 14px; bottom: 14px; }
.hud-label { font-weight: 700; font-stretch: 75%; font-size: 11px; letter-spacing: .1em; text-transform: uppercase; color: var(--graphite); }
.hud-value { font-size: 12px; }
.direction-indicator { width: 22px; height: 22px; display: grid; place-items: center; background: var(--red); color: var(--paper-light); font-size: 14px; }
.minimap { width: 160px; height: 116px; display: block; border: 1.5px solid var(--ink); pointer-events: auto; cursor: pointer; background: var(--paper-light); }
.canvas-empty { position: absolute; top: 50%; left: 50%; transform: translate(-50%, calc(-50% - 44px)); display: flex; align-items: center; gap: 10px; pointer-events: none; font-size: 15px; background: var(--paper-light); border: 1.5px solid var(--ink); padding: 8px 14px; opacity: 0; transition: opacity .25s; }
.canvas-empty.visible { opacity: 1; }
.hint-key { font: 500 12px var(--mono); border: 1.5px solid var(--ink); border-bottom-width: 3px; padding: 2px 8px; }
.canvas-footer { display: flex; flex-wrap: wrap; gap: 6px 18px; padding: 10px 16px; border-top: 2px solid var(--ink); font-size: 13px; color: var(--graphite); }
kbd { font: 500 10px var(--mono); padding: 2px 5px; border: 1px solid var(--graphite); border-bottom-width: 2px; color: var(--ink); background: var(--paper-light); margin-right: 3px; }

/* Controls */
.control-panel { display: flex; flex-direction: column; }
.block { padding: 16px; border-bottom: 1px solid var(--ink); }
.block > .block-label { display: block; margin-bottom: 10px; }
.primary-controls { display: grid; grid-template-columns: 1fr 72px; gap: 6px; }
.play-button, .step-button { height: 44px; border-radius: 2px; font-weight: 700; font-size: 14px; }
.play-button { border: 2px solid var(--ink); background: var(--ink); color: var(--paper-light); display: flex; align-items: center; justify-content: center; gap: 10px; }
.play-button:hover { background: #24362b; }
.play-icon { font-size: 11px; color: #f08a80; }
.step-button { border: 2px solid var(--ink); background: var(--paper-light); }
.step-button:hover, .speed-presets button:hover { background: var(--paper); }
.text-button { margin-top: 10px; padding: 0; border: 0; background: none; font-size: 13px; color: var(--graphite); text-decoration: underline; text-decoration-color: var(--rule); text-underline-offset: 3px; }
.text-button:hover { color: var(--red); text-decoration-color: var(--red); }
.speed-row { display: flex; justify-content: space-between; align-items: baseline; }
.speed-readout { font-size: 12px; }
#actualSpeed { color: var(--graphite); }
#speed { width: 100%; accent-color: var(--red); margin: 12px 0; cursor: pointer; }
.speed-presets { display: grid; grid-template-columns: repeat(6, 1fr); gap: 4px; }
.speed-presets button { border: 1.5px solid var(--ink); background: var(--paper-light); padding: 6px 0; font: 500 11px var(--mono); }
.speed-presets button.selected { background: var(--ink); color: var(--paper-light); }

/* Readings, laid out like a drawing's title block: heavy outer line, light inner lines. */
.title-block { display: grid; grid-template-columns: 1fr 1fr; }
.tb-cell { padding: 10px 14px 12px; border-bottom: 1px solid var(--ink); display: flex; flex-direction: column; gap: 6px; min-width: 0; }
.tb-cell + .tb-cell:not(.tb-wide) { border-left: 1px solid var(--ink); }
.tb-wide { grid-column: 1 / -1; }
.tb-value { font-size: 18px; font-weight: 500; overflow-wrap: anywhere; }
.tb-wide .tb-value { font-size: clamp(22px, 2.4vw, 30px); }
.tb-value:not(.mono) { font-weight: 700; font-stretch: 75%; font-size: 18px; letter-spacing: .04em; }
.tb-arrow { color: var(--red); }
.tb-cell:not(.tb-wide):nth-last-child(-n+2) { border-bottom: 0; }
.rule-select { width: 100%; padding: 8px 10px; border: 1.5px solid var(--ink); border-radius: 2px; background: var(--paper-light); font-size: 13px; cursor: pointer; }
.rule-legend { display: flex; flex-wrap: wrap; gap: 6px 12px; margin-top: 12px; }
.legend-item { display: inline-flex; align-items: center; gap: 5px; font: 500 12px var(--mono); }
.rule-text { margin: 10px 0 0; font-size: 13px; line-height: 1.45; }
.rule-note { margin: 4px 0 0; font-size: 12px; color: var(--graphite); }

/* Fullscreen: the canvas fills the screen and the toolbar and controls float over it. */
.float-bar, .minimize-button, .fullscreen-only { display: none; }
.workspace:fullscreen { display: block; position: relative; background: #e8f0df; }
.workspace:fullscreen .canvas-panel { position: absolute; inset: 0; border: 0; }
.workspace:fullscreen .canvas-wrap { height: 100%; }
.workspace:fullscreen .canvas-footer { display: none; }
.workspace:fullscreen .panel-head, .workspace:fullscreen .control-panel { position: absolute; z-index: 2; border: 2px solid var(--ink); background: var(--paper-light); box-shadow: 4px 4px 0 var(--ink); }
.workspace:fullscreen .panel-head { top: 14px; left: 50%; transform: translateX(-50%); min-height: 0; padding: 6px; gap: 10px; }
.workspace:fullscreen .panel-title { display: none; }
.workspace:fullscreen .control-panel { top: 14px; right: 14px; width: 300px; max-height: calc(100% - 28px); overflow: auto; }
.workspace:fullscreen .float-bar { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 6px 6px 6px 16px; border-bottom: 2px solid var(--ink); }
.workspace:fullscreen .minimize-button, .workspace:fullscreen .fullscreen-only { display: inline-block; }
.workspace:fullscreen .canvas-tools { flex-wrap: wrap; }
.workspace:fullscreen .minimized > :not(.float-bar, .minimize-button) { display: none; }
.workspace:fullscreen .control-panel.minimized { width: auto; }
.workspace:fullscreen .control-panel.minimized .float-bar { border-bottom: 0; }

/* Wiki page */
.wiki-hero { padding: 14px 0 30px; max-width: 1008px; margin: 0 auto; }
.wiki-hero .wiki-lede { max-width: 760px; }
.wiki-lede { font-size: 18px; line-height: 1.55; margin: 16px 0 0; }
.wiki-lede a, .wiki-article a { color: var(--red); text-underline-offset: 3px; }
.wiki-layout { display: grid; grid-template-columns: 200px minmax(0, 760px); gap: 48px; align-items: start; max-width: 1008px; margin: 0 auto; }
.toc { position: sticky; top: 20px; display: flex; flex-direction: column; border-left: 2px solid var(--ink); padding-left: 14px; }
.toc .block-label { margin-bottom: 8px; }
.toc a { color: var(--graphite); text-decoration: none; font-size: 14px; padding: 3px 0; }
.toc a:hover { color: var(--red); }
.wiki-article { background: var(--paper-light); border: 2px solid var(--ink); padding: 8px 40px 32px; }
.wiki-article section { padding-top: 22px; scroll-margin-top: 16px; }
.wiki-article section + section { border-top: 1px solid var(--rule); margin-top: 18px; }
.wiki-article h2 { margin: 0 0 10px; font-weight: 800; font-stretch: 125%; font-size: 24px; letter-spacing: -.01em; }
.wiki-article p, .wiki-list li, .wiki-facts dd { font-size: 16px; line-height: 1.7; }
.wiki-article p { margin: 0 0 12px; max-width: 68ch; }
.code { margin: 6px 0 14px; padding: 14px 16px; background: var(--paper); border: 1.5px solid var(--ink); font: 13px/1.7 var(--mono); overflow-x: auto; }
.phases { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 12px 0 4px; }
.phases figure { margin: 0; }
.phases canvas { display: block; width: 100%; aspect-ratio: 1; background: var(--paper); border: 1.5px solid var(--ink); }
.phases figcaption { margin-top: 8px; font-size: 13px; line-height: 1.45; color: var(--graphite); }
.phases figcaption strong { color: var(--ink); }
.ant-cards { display: flex; flex-direction: column; gap: 14px; margin-top: 16px; }
.ant-card { display: grid; grid-template-columns: 190px minmax(0, 1fr); gap: 20px; padding: 16px; border: 1.5px solid var(--ink); background: var(--paper-light); scroll-margin-top: 16px; }
.ant-card figure { margin: 0; }
.ant-card canvas { display: block; width: 100%; aspect-ratio: 1; background: var(--paper); border: 1.5px solid var(--ink); }
.ant-card figcaption { margin-top: 6px; font-size: 12px; color: var(--graphite); }
.ant-card h3 { margin: 0; font-size: 18px; font-weight: 700; overflow-wrap: anywhere; }
.ant-kind { display: block; margin-top: 2px; font-weight: 700; font-stretch: 75%; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--graphite); }
.cycle { display: flex; flex-wrap: wrap; gap: 6px 10px; margin: 10px 0 12px; }
.wiki-article .ant-card p { font-size: 15px; line-height: 1.6; margin: 0 0 8px; }
.wiki-facts { margin: 0; display: grid; gap: 0; border: 1.5px solid var(--ink); }
.wiki-facts > div { padding: 12px 16px; }
.wiki-facts > div + div { border-top: 1px solid var(--ink); }
.wiki-facts dt { font-weight: 700; font-stretch: 75%; font-size: 15px; letter-spacing: .06em; text-transform: uppercase; }
.wiki-facts dd { margin: 4px 0 0; }
.wiki-list { margin: 0 0 12px; padding-left: 20px; }
.wiki-list li { margin-bottom: 6px; }
.sources { margin: 0; padding-left: 20px; font-size: 14px; line-height: 1.6; color: var(--graphite); }
.sources li { margin-bottom: 8px; overflow-wrap: anywhere; }

@media (max-width: 1200px) {
  .intro { grid-template-columns: minmax(0, 1fr) 300px; }
  .facts { grid-column: 1 / -1; grid-row: 2; }
  .facts dl { flex-direction: row; gap: 28px; }
}
@media (max-width: 1000px) {
  .app-shell { padding: 0 20px 24px; }
  .workspace { grid-template-columns: minmax(0, 1fr) 270px; }
  .canvas-wrap { height: 520px; }
  .panel-subtitle { display: none; }
}
@media (max-width: 760px) {
  .wiki-layout { display: block; }
  .toc { display: none; }
  .wiki-article { padding: 4px 18px 24px; }
  .phases { gap: 8px; }
  .ant-card { grid-template-columns: 1fr; }
  .ant-card figure { max-width: 220px; }
  .phases figcaption { font-size: 12px; }
  .code { font-size: 12px; padding: 12px; }
  .app-shell { padding: 0 12px 20px; }
  .topbar { height: 56px; }
  .intro { display: block; padding: 14px 0 22px; }
  .rule-card { margin-top: 18px; }
  .facts { margin-top: 22px; }
  .facts dl { flex-direction: column; gap: 10px; }
  .topnav { margin-left: 14px; }
  .workspace { display: flex; flex-direction: column; align-items: stretch; }
  .panel-head { flex-wrap: wrap; }
  .canvas-tools { flex-wrap: wrap; }
  .canvas-wrap { height: min(68vh, 520px); min-height: 340px; }
  .canvas-footer { display: none; }
  .control-panel { display: grid; grid-template-columns: 1fr 1fr; }
  .block + .block { border-left: 1px solid var(--ink); }
  .speed-presets { grid-template-columns: repeat(4, 1fr); }
  .control-panel .rule-block { grid-column: 1 / -1; border-left: 0; border-top: 1px solid var(--ink); }
  .title-block { grid-column: 1 / -1; border-top: 1px solid var(--ink); }
  .block { border-bottom: 0; }
  .workspace:fullscreen .panel-head { left: 12px; right: 12px; transform: none; }
  .workspace:fullscreen .control-panel { top: auto; bottom: 12px; left: 12px; right: 12px; width: auto; max-height: 55%; display: block; }
  .workspace:fullscreen .control-panel.minimized { left: auto; }
}
@media (max-width: 480px) {
  .control-panel { grid-template-columns: 1fr; }
  .block + .block { border-left: 0; border-top: 1px solid var(--ink); }
  .minimap { width: 110px; height: 80px; }
  .hud-bottom-left { bottom: auto; top: 12px; left: 12px; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; } }