/* moonpool — a pool deck: lanes, lane ropes, a board that keeps count.
   Flat ink on chalk, hard edges, no blur. Night is the same pool under lamps. */

:root {
  color-scheme: light;
  --paper: #f2eee3;
  --paper-2: #e7e1d1;
  --card: #fbf8f0;
  --ink: #0c2030;
  --ink-2: #223a4d;
  --ink-3: #5a6f83;
  --ink-4: #8a9cab;
  --lane: #124d76;
  --lane-2: #1b6f9d;
  --rope: #c9402b;
  --buoy: #d9a017;
  --mint: #217f6b;
  --line: rgba(12, 32, 48, 0.16);
  --line-2: rgba(12, 32, 48, 0.3);
  --shadow: 5px 5px 0 var(--ink);
  --shadow-sm: 3px 3px 0 var(--ink);
  --display: "Archivo", "Helvetica Neue", Arial, sans-serif;
  --sans: "IBM Plex Sans", system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #0a141d;
  --paper-2: #0f1e29;
  --card: #101f2b;
  --ink: #e9f2f8;
  --ink-2: #c2d4e0;
  --ink-3: #8aa1b4;
  --ink-4: #64798b;
  --lane: #5fb9e2;
  --lane-2: #8fd6f2;
  --rope: #ff7d5f;
  --buoy: #f2c347;
  --mint: #55c8ac;
  --line: rgba(230, 242, 250, 0.16);
  --line-2: rgba(230, 242, 250, 0.3);
  --shadow: 5px 5px 0 #000;
  --shadow-sm: 3px 3px 0 #000;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper: #0a141d;
    --paper-2: #0f1e29;
    --card: #101f2b;
    --ink: #e9f2f8;
    --ink-2: #c2d4e0;
    --ink-3: #8aa1b4;
    --ink-4: #64798b;
    --lane: #5fb9e2;
    --lane-2: #8fd6f2;
    --rope: #ff7d5f;
    --buoy: #f2c347;
    --mint: #55c8ac;
    --line: rgba(230, 242, 250, 0.16);
    --line-2: rgba(230, 242, 250, 0.3);
    --shadow: 5px 5px 0 #000;
    --shadow-sm: 3px 3px 0 #000;
  }
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
  -webkit-text-size-adjust: 100%;
}

/* A scrollbar like a lane rope: a striped rope on a pale gutter. */
@supports not selector(::-webkit-scrollbar) {
  html {
    scrollbar-width: thin;
    scrollbar-color: var(--lane) var(--paper-2);
  }
}
::-webkit-scrollbar { width: 12px; height: 12px; }
::-webkit-scrollbar-track { background: var(--paper-2); }
::-webkit-scrollbar-thumb {
  background: repeating-linear-gradient(-45deg,
    var(--rope) 0 6px,
    var(--buoy) 6px 12px);
  border: 3px solid var(--paper-2);
  border-radius: 12px;
}
::-webkit-scrollbar-thumb:hover { background: var(--rope); }
::-webkit-scrollbar-button { display: none; }
::-webkit-scrollbar-corner { background: transparent; }
pre::-webkit-scrollbar { height: 9px; }
pre::-webkit-scrollbar-track { background: rgba(255, 255, 255, 0.08); }
pre::-webkit-scrollbar-thumb {
  background: repeating-linear-gradient(-45deg, #d9714f 0 5px, #e9b320 5px 10px);
  border: 2px solid transparent;
  background-clip: padding-box;
}

body {
  margin: 0;
  color: var(--ink-2);
  background-color: var(--paper);
  background-image:
    linear-gradient(90deg, var(--line) 1px, transparent 1px),
    linear-gradient(180deg, color-mix(in oklab, var(--lane) 8%, transparent), transparent 320px);
  background-size: 96px 100%, 100% 100%;
  background-position: -1px 0, 0 0;
  font-family: var(--sans);
  font-size: 16.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

@media (width <= 700px) {
  body { background-size: 64px 100%, 100% 100%; }
}

h1, h2, h3, h4 {
  font-family: var(--display);
  color: var(--ink);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.04;
  margin: 0;
  text-wrap: balance;
}

h1 { font-size: clamp(2.4rem, 5.6vw, 4.6rem); text-transform: uppercase; letter-spacing: -0.03em; }
h2 { font-size: clamp(1.45rem, 2.5vw, 2.1rem); }
h3 { font-size: 1.05rem; letter-spacing: -0.01em; }

p { margin: 0 0 1rem; }
p:last-child { margin-bottom: 0; }
strong, b { color: var(--ink); font-weight: 600; }

a { color: var(--lane); text-decoration: none; text-underline-offset: 0.2em; }
a:hover { text-decoration: underline; }

.mono, code, pre, kbd { font-family: var(--mono); font-variant-ligatures: none; }

code {
  font-size: 0.86em;
  padding: 0.06em 0.34em;
  border-radius: 3px;
  background: color-mix(in oklab, var(--lane) 10%, transparent);
  color: var(--ink);
  border: 1px solid color-mix(in oklab, var(--lane) 18%, transparent);
}

.wrap { width: min(1180px, 100% - 3rem); margin-inline: auto; }
.eyebrow {
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--lane);
  margin: 0 0 0.7rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--rope) 0 4px, var(--buoy) 4px 8px);
}
.lede { font-size: clamp(1.02rem, 1.4vw, 1.15rem); line-height: 1.6; color: var(--ink-2); max-width: 62ch; }
.dim { color: var(--ink-3); }
.small { font-size: 0.88rem; }
.tiny { font-size: 0.78rem; }
.skip { position: absolute; left: 1rem; top: -3rem; padding: 0.5rem 0.9rem; background: var(--ink); color: var(--paper); z-index: 100; }
.skip:focus { top: 1rem; }

/* ---- bar ------------------------------------------------------------ */

.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in oklab, var(--paper) 94%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 2px solid var(--ink);
}
.bar { display: flex; align-items: center; justify-content: space-between; gap: 1rem; padding: 0.65rem 0; }
.brand { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--ink); }
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 26px;
  height: 26px;
  border: 2px solid var(--ink);
  background:
    linear-gradient(180deg, var(--lane) 0 46%, var(--paper) 46% 54%, var(--lane-2) 54% 100%);
  position: relative;
}
.brand-mark::after {
  content: "";
  position: absolute;
  left: 1px;
  right: 1px;
  top: 46%;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--rope) 0 3px, var(--buoy) 3px 6px);
}
.brand-name { font-family: var(--display); font-weight: 800; font-size: 1.24rem; letter-spacing: -0.03em; }
.brand-sub { font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); }

.nav { display: flex; align-items: center; gap: 0.15rem; font-family: var(--mono); font-size: 0.76rem; text-transform: uppercase; letter-spacing: 0.06em; }
.nav a { color: var(--ink-2); padding: 0.42rem 0.6rem; border: 1px solid transparent; }
.nav a:hover { text-decoration: none; border-color: var(--line-2); }
.nav a[aria-current="page"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.gh { display: inline-flex; width: 32px; height: 32px; align-items: center; justify-content: center; color: var(--ink-2); border: 1px solid transparent; }
.gh svg { width: 17px; height: 17px; fill: currentColor; }
.gh:hover { border-color: var(--line-2); }
.themebtn {
  width: 32px; height: 32px; display: inline-grid; place-items: center;
  border: 1px solid var(--line-2); background: var(--card); color: var(--ink);
  cursor: pointer; font-size: 0.85rem; padding: 0;
}
.themebtn:hover { background: var(--paper-2); }

/* ---- hero ----------------------------------------------------------- */

.hero { padding: clamp(2.2rem, 5vw, 3.8rem) 0 1.4rem; }
.hero h1 { margin: 0 0 1.1rem; }
.hero h1 em { font-style: normal; color: var(--lane); }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(1.5rem, 4vw, 3rem); align-items: start; }
.hero-side { padding-top: 0.35rem; }
.hero-side .lede { margin-bottom: 1.4rem; }
.cta { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; }

.btn {
  display: inline-flex; align-items: center; gap: 0.5rem;
  font-family: var(--mono); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em;
  padding: 0.6rem 1rem; border: 2px solid var(--ink); background: var(--ink); color: var(--paper);
  box-shadow: var(--shadow-sm); cursor: pointer;
}
.btn:hover { text-decoration: none; transform: translate(1px, 1px); box-shadow: 1px 1px 0 var(--ink); }
.btn.ghost { background: var(--card); color: var(--ink); }
.btn.ghost:hover { background: var(--paper-2); }

.cmd {
  display: inline-flex; align-items: center; gap: 0.55rem;
  margin-top: 1rem; padding: 0.4rem 0.5rem 0.4rem 0.7rem;
  border: 1px solid var(--line-2); background: var(--card);
  font-family: var(--mono); font-size: 0.78rem; color: var(--ink-3);
}
.cmd code { background: none; border: 0; padding: 0; color: var(--ink); }
.cmd button {
  font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.1em; text-transform: uppercase;
  border: 1px solid var(--line-2); background: var(--paper); color: var(--ink-2);
  padding: 0.16rem 0.4rem; cursor: pointer;
}
.cmd button:hover { color: var(--ink); }

/* ---- the lane strip -------------------------------------------------- */

.laneboard {
  border: 2px solid var(--ink);
  background: var(--card);
  box-shadow: var(--shadow);
}
.laneboard-head {
  display: flex; align-items: baseline; justify-content: space-between; gap: 1rem;
  padding: 0.55rem 0.8rem;
  border-bottom: 2px solid var(--ink);
  font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-3);
}
.lanes { display: flex; align-items: stretch; padding: 0.7rem 0.8rem; gap: 3px; min-height: 92px; }
.lane {
  flex: 1 1 0;
  min-width: 0;
  border: 1px solid var(--line-2);
  background: var(--paper);
  position: relative;
  display: flex; align-items: flex-end; justify-content: center;
  font-family: var(--mono); font-size: 0.62rem; color: var(--ink-4);
  padding-bottom: 3px;
  overflow: hidden;
}
.lane::before {
  content: "";
  position: absolute; inset: 0;
  background: var(--lane-2);
  transform-origin: bottom;
  transform: scaleY(0);
  transition: transform 0.35s cubic-bezier(0.2, 0.8, 0.3, 1);
}
.lane.busy::before { transform: scaleY(1); background: var(--lane); }
.lane.idle::before { transform: scaleY(0.42); background: color-mix(in oklab, var(--lane-2) 55%, var(--paper)); }
.lane.shed::before { transform: scaleY(1); background: var(--rope); }
.lane span { position: relative; color: var(--paper); font-weight: 600; }
.lane:not(.busy):not(.idle):not(.shed) span { color: var(--ink-4); }
.laneboard-foot {
  display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap;
  padding: 0.5rem 0.8rem; border-top: 2px solid var(--ink);
  font-family: var(--mono); font-size: 0.7rem; color: var(--ink-3);
}

/* ---- figures --------------------------------------------------------- */

.figures {
  display: grid; grid-template-columns: repeat(4, 1fr);
  border: 2px solid var(--ink); background: var(--card);
  box-shadow: var(--shadow);
  margin-top: 2.2rem;
}
.figures div { padding: 0.9rem 1rem; border-left: 1px solid var(--line); }
.figures div:first-child { border-left: 0; }
.figures b {
  display: block; font-family: var(--display); font-weight: 800;
  font-size: 1.9rem; line-height: 1; letter-spacing: -0.04em; color: var(--ink);
}
.figures span { display: block; margin-top: 0.3rem; font-size: 0.75rem; color: var(--ink-3); }

/* ---- sections -------------------------------------------------------- */

section { padding: 3rem 0; }
.sec-head { max-width: 64ch; margin-bottom: 1.5rem; }
.sec-head h2 { margin-bottom: 0.4rem; }
.sec-head p { color: var(--ink-3); }

.grid { display: grid; gap: 1rem; }
.grid.four { grid-template-columns: repeat(4, 1fr); }
.grid.three { grid-template-columns: repeat(3, 1fr); }
.grid.two { grid-template-columns: repeat(2, 1fr); }

.card {
  border: 2px solid var(--ink);
  background: var(--card);
  box-shadow: var(--shadow-sm);
  padding: 1.1rem 1.15rem;
  display: flex; flex-direction: column; gap: 0.45rem;
}
.card h3 { display: flex; align-items: baseline; gap: 0.5rem; }
.card p { font-size: 0.88rem; color: var(--ink-3); }

.answer { font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.02em; }
.answer b { background: var(--ink); color: var(--paper); padding: 0.05em 0.35em; font-weight: 500; }

.linkcard {
  display: block; color: inherit;
  border: 2px solid var(--ink); background: var(--card); box-shadow: var(--shadow-sm);
  padding: 1.1rem 1.15rem;
  transition: transform 0.12s, box-shadow 0.12s;
}
.linkcard:hover { text-decoration: none; transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
.linkcard h3 { display: flex; justify-content: space-between; gap: 1rem; align-items: baseline; }
.linkcard h3 span { font-family: var(--mono); font-size: 0.78rem; color: var(--lane); }
.linkcard p { margin: 0.4rem 0 0; font-size: 0.87rem; color: var(--ink-3); }

/* ---- tables ---------------------------------------------------------- */

.table-wrap { border: 2px solid var(--ink); background: var(--card); box-shadow: var(--shadow-sm); overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
thead th {
  text-align: left; font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--ink-3); font-weight: 500;
  padding: 0.6rem 0.8rem; border-bottom: 2px solid var(--ink); white-space: nowrap;
}
tbody td { padding: 0.55rem 0.8rem; border-bottom: 1px solid var(--line); vertical-align: top; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: color-mix(in oklab, var(--lane) 5%, transparent); }
td.mono, th.mono { font-family: var(--mono); font-size: 0.82rem; }

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

.code {
  border: 2px solid var(--ink);
  background: #0b1a26;
  margin: 0 0 0.8rem;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.code-bar {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  padding: 0.35rem 0.7rem; border-bottom: 1px solid rgba(255, 255, 255, 0.18);
  font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.14em; text-transform: uppercase;
  color: #7f9cb0;
  background: #08141d;
}
.copy {
  font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.1em; text-transform: uppercase;
  background: none; border: 1px solid rgba(255, 255, 255, 0.2); color: #9fb7c7; cursor: pointer;
  padding: 0.1rem 0.4rem;
}
.copy:hover { color: #e9f2f8; }
.copy.done { color: var(--buoy); border-color: var(--buoy); }
.code pre {
  margin: 0; padding: 0.85rem 1rem 0.95rem;
  overflow-x: auto; overflow-y: hidden;
  font-family: var(--mono); font-size: 0.81rem; line-height: 1.72;
  color: #d8e8f2;
}
.code pre code { background: none; border: 0; padding: 0; color: inherit; font-size: inherit; }
.code .c { color: #6f8b9e; font-style: italic; }

.out {
  border: 1px solid var(--line-2);
  border-left: 3px solid var(--mint);
  background: color-mix(in oklab, var(--card) 88%, var(--paper-2));
  padding: 0.6rem 0.9rem;
  margin: 0 0 1.4rem;
  font-family: var(--mono);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--ink-2);
  white-space: pre;
  overflow-x: auto;
}

.callout {
  border: 2px solid var(--ink);
  border-left: 8px solid var(--buoy);
  background: var(--card);
  padding: 0.85rem 1rem;
  font-size: 0.9rem;
}

/* ---- guide ----------------------------------------------------------- */

.doc { display: grid; grid-template-columns: 210px minmax(0, 1fr); gap: 3rem; align-items: start; padding: 2rem 0 4rem; }
.toc { position: sticky; top: 84px; font-size: 0.82rem; border-top: 2px solid var(--ink); padding-top: 0.7rem; }
.toc p { font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-4); margin: 0 0 0.5rem; }
.toc a { display: block; padding: 0.22rem 0; color: var(--ink-2); font-family: var(--mono); font-size: 0.75rem; line-height: 1.4; border-bottom: 1px solid var(--line); }
.toc a:hover { color: var(--lane); text-decoration: none; }

.chapter { padding: 0 0 2.4rem; scroll-margin-top: 90px; min-width: 0; }
.chapter + .chapter { border-top: 1px solid var(--line); padding-top: 2.2rem; }
.chapter h2 { margin-bottom: 0.5rem; }
.chapter h2 .num {
  display: block; font-family: var(--mono); font-size: 0.68rem; font-weight: 500;
  letter-spacing: 0.18em; color: var(--rope); margin-bottom: 0.3rem;
}
.chapter p { max-width: 68ch; }

/* Start buttons: one hairline at the top right, one at the bottom left. Neither
   is there until the button is asked for; then both come in and drift a few
   pixels left and right, each at its own pace. */
.scenarios { display: flex; flex-wrap: wrap; gap: 0.75rem 0.35rem; padding: 0.65rem 0.6rem 0.8rem; }

.launch { position: relative; }
.launch:not(.btn) {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.34rem 0.58rem;
  border: 2px solid var(--ink);
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
}
.launch:not(.btn):hover { background: var(--paper-2); }

.launch::before,
.launch::after {
  content: "";
  position: absolute;
  width: 11px;
  height: 1px;
  background: currentColor;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.22s ease;
}
.launch::before { top: -5px; right: 7px; }
.launch::after { bottom: -5px; left: 7px; }

.launch:hover::before,
.launch:hover::after,
.launch:focus-visible::before,
.launch:focus-visible::after { opacity: 0.55; }

.launch:hover::before,
.launch:focus-visible::before {
  animation: drift var(--dur-a, 1.15s) cubic-bezier(0.45, 0.05, 0.55, 0.95)
    var(--delay-a, 0s) infinite;
}
.launch:hover::after,
.launch:focus-visible::after {
  animation: drift var(--dur-b, 1.5s) cubic-bezier(0.45, 0.05, 0.55, 0.95)
    var(--delay-b, 0.1s) infinite reverse;
}

/* Uneven stops, so the line wanders instead of swinging. The amplitude and the
   pace are drawn fresh on every hover, which is what keeps it from reading as a
   loop. */
@keyframes drift {
  0%   { transform: translateX(0); }
  28%  { transform: translateX(calc(var(--dx, 3px) * -1)); }
  52%  { transform: translateX(calc(var(--dx2, 3px) * 0.72)); }
  74%  { transform: translateX(calc(var(--dx, 3px) * -0.35)); }
  100% { transform: translateX(0); }
}

/* On a filled button the hairlines sit outside it, on the paper. */
.btn.launch::before,
.btn.launch::after {
  background: color-mix(in oklab, var(--ink) 45%, transparent);
  top: auto;
  bottom: auto;
}
.btn.launch::before { top: -8px; }
.btn.launch::after { bottom: -8px; }

@media (prefers-reduced-motion: reduce) {
  .launch:hover::before, .launch:focus-visible::before,
  .launch:hover::after, .launch:focus-visible::after { animation: none; }
}

/* ---- sim page -------------------------------------------------------- */

.sim { display: grid; grid-template-columns: minmax(0, 1fr) 320px; gap: 1.2rem; align-items: start; }
.sim-main { border: 2px solid var(--ink); background: var(--card); box-shadow: var(--shadow); }
.sim-head { display: flex; flex-wrap: wrap; gap: 0.6rem 1rem; align-items: center; justify-content: space-between; padding: 0.6rem 0.85rem; border-bottom: 2px solid var(--ink); }
.sim-head h2 { font-size: 1rem; }
.sim-controls { padding: 0.85rem; border-bottom: 1px solid var(--line-2); display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0.6rem 0.9rem; }
.field { display: flex; flex-direction: column; gap: 0.2rem; min-width: 0; }
.field label { font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); }
.field input[type="number"], .field select {
  font-family: var(--mono); font-size: 0.85rem; color: var(--ink);
  border: 1px solid var(--line-2); background: var(--paper); padding: 0.35rem 0.45rem; width: 100%;
}
.field input[type="range"] { width: 100%; accent-color: var(--lane); }
.field .val { font-family: var(--mono); font-size: 0.78rem; color: var(--ink); }
.check { display: flex; align-items: center; gap: 0.45rem; font-family: var(--mono); font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--ink-2); }

.chart { display: block; width: 100%; height: auto; }
.chart text { font-family: var(--mono); font-size: 11px; fill: var(--ink-3); }
.chart .grid-line { stroke: var(--line); stroke-width: 1; }
.chart .busy-area { fill: color-mix(in oklab, var(--lane) 78%, transparent); }
.chart .idle-area { fill: color-mix(in oklab, var(--lane-2) 30%, transparent); }
.chart .refuse-line { stroke: var(--rope); stroke-width: 1.6; fill: none; }
.chart .axis { stroke: var(--ink-3); stroke-width: 1; }

.sim-side { display: grid; gap: 1rem; }
.board { border: 2px solid var(--ink); background: var(--card); box-shadow: var(--shadow-sm); }
.board h3 { padding: 0.5rem 0.75rem; border-bottom: 2px solid var(--ink); font-family: var(--mono); font-size: 0.66rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-3); font-weight: 500; }
.board dl { margin: 0; padding: 0.5rem 0.75rem 0.7rem; display: grid; grid-template-columns: 1fr auto; gap: 0.25rem 0.6rem; font-family: var(--mono); font-size: 0.78rem; }
.board dt { color: var(--ink-3); }
.board dd { margin: 0; text-align: right; color: var(--ink); font-weight: 600; }
.board dd.hot { color: var(--rope); }
.board dd.cool { color: var(--mint); }

.lane-strip { display: flex; gap: 2px; padding: 0.6rem 0.75rem; flex-wrap: wrap; }
.chip {
  width: 20px; height: 20px; border: 1px solid var(--line-2); background: var(--paper);
  font-family: var(--mono); font-size: 0.55rem; display: grid; place-items: center; color: var(--ink-4);
}
.chip.busy { background: var(--lane); border-color: var(--lane); color: var(--paper); }
.chip.idle { background: color-mix(in oklab, var(--lane-2) 45%, var(--paper)); border-color: var(--lane-2); color: var(--ink); }
.chip.shed { background: var(--rope); border-color: var(--rope); color: var(--paper); }

.legend { display: flex; flex-wrap: wrap; gap: 0.4rem 0.9rem; font-family: var(--mono); font-size: 0.68rem; color: var(--ink-3); padding: 0.5rem 0.85rem 0.8rem; }
.legend i { display: inline-block; width: 11px; height: 11px; margin-right: 0.35rem; vertical-align: -1px; border: 1px solid var(--line-2); }
.legend .l-busy { background: var(--lane); border-color: var(--lane); }
.legend .l-idle { background: color-mix(in oklab, var(--lane-2) 45%, var(--paper)); }
.legend .l-refuse { background: var(--rope); border-color: var(--rope); }

/* ---- api ------------------------------------------------------------- */

.api { display: grid; grid-template-columns: 230px minmax(0, 1fr); gap: 2.6rem; align-items: start; padding: 2rem 0 4rem; }
.api-nav { position: sticky; top: 84px; max-height: calc(100vh - 110px); overflow-y: auto; padding-right: 0.5rem; }
.api-nav h4 { font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-4); font-weight: 500; margin: 0 0 0.5rem; }
.api-nav ol { list-style: none; margin: 0 0 1.1rem; padding: 0; }
.api-nav ol.sub { margin: 0.15rem 0 0.9rem 0.5rem; border-left: 1px solid var(--line); }
.api-nav a { display: block; padding: 0.14rem 0 0.14rem 0.5rem; color: var(--ink-2); font-family: var(--mono); font-size: 0.73rem; line-height: 1.45; border-left: 2px solid transparent; margin-left: -1px; }
.api-nav a:hover { color: var(--lane); text-decoration: none; border-left-color: var(--rope); }
.api-nav > ol > li > a { color: var(--ink); font-weight: 600; font-size: 0.78rem; }

.api-body { min-width: 0; }
.api-filter { position: sticky; top: 66px; z-index: 5; display: flex; gap: 0.6rem; align-items: center; padding: 0.6rem 0 0.8rem; background: var(--paper); border-bottom: 1px solid var(--line); }
.api-filter input {
  font-family: var(--mono); font-size: 0.82rem; padding: 0.45rem 0.6rem; width: min(340px, 100%);
  border: 1px solid var(--line-2); background: var(--card); color: var(--ink);
}
.api-filter .count { font-family: var(--mono); font-size: 0.7rem; color: var(--ink-3); white-space: nowrap; }

.band { margin-bottom: 2.2rem; scroll-margin-top: 80px; }
.band-head { display: flex; align-items: baseline; justify-content: space-between; gap: 1rem; border-bottom: 2px solid var(--ink); padding-bottom: 0.4rem; margin-bottom: 0.7rem; }
.band-head h2 { font-family: var(--mono); font-size: 1.16rem; letter-spacing: -0.03em; text-transform: none; }
.band-head .route { font-family: var(--mono); font-size: 0.7rem; color: var(--ink-4); }

.group { font-family: var(--mono); font-size: 0.64rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-4); font-weight: 500; margin: 1.6rem 0 0.2rem; }
.entry { padding: 0.85rem 0 0.95rem; border-bottom: 1px solid var(--line); scroll-margin-top: 130px; }
.entry h3 { display: flex; align-items: center; gap: 0.5rem; font-family: var(--mono); font-size: 0.92rem; font-weight: 600; margin-bottom: 0.3rem; }
.kind {
  font-family: var(--mono); font-size: 0.56rem; letter-spacing: 0.1em; text-transform: uppercase;
  padding: 0.12rem 0.34rem; border: 1px solid var(--ink); background: var(--ink); color: var(--paper); font-weight: 500;
}
.kind.ty { background: var(--lane); border-color: var(--lane); color: #fff; }
.kind.er { background: var(--rope); border-color: var(--rope); color: #fff; }
.sig {
  display: inline-block; max-width: 100%;
  margin: 0.35rem 0 0.5rem; padding: 0.45rem 0.65rem;
  border: 1px solid var(--line-2); border-left: 3px solid var(--lane);
  background: color-mix(in oklab, var(--lane) 6%, var(--card));
  font-family: var(--mono); font-size: 0.79rem; line-height: 1.6; color: var(--ink);
  overflow-x: auto; white-space: pre;
}
.entry p { font-size: 0.89rem; max-width: 76ch; }
.variants { list-style: none; margin: 0.45rem 0; padding: 0; display: flex; flex-wrap: wrap; gap: 0.3rem; }
.variants li { font-family: var(--mono); font-size: 0.76rem; padding: 0.22rem 0.5rem; border: 1px solid var(--line-2); background: var(--card); }

/* ---- footer ---------------------------------------------------------- */

footer.site { border-top: 2px solid var(--ink); padding: 1.8rem 0 2.4rem; margin-top: 2rem; }
.foot { display: flex; flex-wrap: wrap; gap: 0.8rem 2rem; align-items: baseline; justify-content: space-between; font-family: var(--mono); font-size: 0.72rem; color: var(--ink-3); }
.foot nav { display: flex; flex-wrap: wrap; gap: 1rem; }
.foot a { color: var(--ink-3); }
.foot a:hover { color: var(--ink); }

/* wide glyphs take two cells in a monospaced run */
.glyph { display: inline-block; }
.glyph.w2 { width: 2ch; }

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

@media (width <= 1080px) {
  .grid.four { grid-template-columns: repeat(2, 1fr); }
  .sim { grid-template-columns: minmax(0, 1fr); }
  .sim-controls { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .api { grid-template-columns: 190px minmax(0, 1fr); gap: 2rem; }
}

@media (width <= 860px) {
  body { font-size: 16px; }
  .wrap { width: min(100% - 1.9rem, 100%); }
  .hero-grid { grid-template-columns: minmax(0, 1fr); gap: 1.4rem; }
  .grid.four, .grid.three, .grid.two { grid-template-columns: 1fr; }
  .figures { grid-template-columns: repeat(2, 1fr); }
  .figures div { border-left: 0; border-top: 1px solid var(--line); }
  .figures div:nth-child(-n+2) { border-top: 0; }
  .doc { grid-template-columns: minmax(0, 1fr); gap: 1.2rem; padding-top: 1.2rem; }
  .toc { position: static; display: flex; flex-wrap: wrap; gap: 0.3rem; border-top: 2px solid var(--ink); padding-top: 0.6rem; }
  .toc p { width: 100%; margin-bottom: 0.1rem; }
  .toc a {
    border: 1px solid var(--line-2);
    background: var(--card);
    padding: 0.28rem 0.5rem;
    font-size: 0.72rem;
  }
  .toc a:hover { border-color: var(--ink); }
  .api { grid-template-columns: minmax(0, 1fr); }
  .api-nav { position: static; max-height: none; border-bottom: 1px solid var(--line); padding-bottom: 0.7rem; }
  .api-nav h4 { display: none; }
  .api-nav > ol { display: inline; margin: 0; }
  .api-nav > ol > li { display: inline; }
  .api-nav > ol > li > a { display: inline-block; margin: 0 0.3rem 0.3rem 0; padding: 0.3rem 0.55rem; border: 1px solid var(--line-2); background: var(--card); }
  .api-nav ol.sub { display: none; }
  .api-filter { position: static; }
  .brand-sub { display: none; }
  .nav a { padding: 0.38rem 0.45rem; font-size: 0.7rem; }
  .hero h1 { font-size: clamp(2rem, 8.5vw, 2.9rem); }
}

@media (width <= 520px) {
  .laneboard-head span:last-child { display: none; }
  .figures { grid-template-columns: repeat(2, 1fr); }
  .figures div { border-top: 1px solid var(--line); }
  .figures div:nth-child(-n+2) { border-top: 0; }
  .figures div:nth-child(odd) { border-left: 0; }
  .sim-controls { grid-template-columns: 1fr; }
  .bar { gap: .5rem; }
  .nav { font-size: 0.66rem; letter-spacing: 0.02em; }
  .nav a { padding: 0.34rem 0.32rem; }
  .brand-name { font-size: 1.08rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .lane::before { transition: none; }
  .btn:hover, .linkcard:hover { transform: none; }
}

html, button, input, textarea, select { font-variant-ligatures: no-contextual; }

/* The page scroll bar shows while the page moves or under the pointer and
   hides a moment after; it keeps its place, so nothing shifts. */
@supports selector(::-webkit-scrollbar) {
  html:not(.scrolling)::-webkit-scrollbar-thumb { background: transparent; border-color: transparent; box-shadow: none; }
}
@supports not selector(::-webkit-scrollbar) {
  html:not(.scrolling) { scrollbar-color: transparent transparent; }
}