/* Ryan Kamp — the workshop. Paper, graphite, non-photo blue for construction
   lines, and one red pencil that only the person at the gate gets to hold. */

@font-face {
  font-family: 'National Park';
  src: url('assets/fonts/national-park-latin.woff2') format('woff2');
  font-weight: 200 800;
  font-display: swap;
}

:root {
  --paper: #f4f0e6;
  --paper-2: #ebe5d6;
  --ink: #2a2927;
  --ink-2: #5a5750;
  --blue: #256e86;
  --blue-line: rgba(64, 150, 180, 0.2);
  --blue-line-2: rgba(64, 150, 180, 0.38);
  --red: #c5281c;
  --hair: 1.25px;
  --pad: clamp(16px, 3.2vw, 44px);
  --font: 'National Park', ui-rounded, 'Avenir Next', system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--blue-line-2) 1px, transparent 1px),
    linear-gradient(90deg, var(--blue-line-2) 1px, transparent 1px),
    linear-gradient(var(--blue-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--blue-line) 1px, transparent 1px);
  background-size: 120px 120px, 120px 120px, 24px 24px, 24px 24px;
  color: var(--ink);
  font: 400 1.0625rem/1.55 var(--font);
  font-variant-numeric: tabular-nums;
  overflow-x: hidden;
}
a { color: inherit; text-decoration-color: var(--red); text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
a:hover { color: var(--red); }
:focus-visible { outline: 2px solid var(--red); outline-offset: 3px; border-radius: 2px; }
p { margin: 0 0 0.9em; text-wrap: pretty; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: 8px 12px; z-index: 10; }
.skip:focus { left: 8px; }

/* ---------- sheets ---------- */
.sheet {
  position: relative;
  margin: clamp(10px, 1.6vw, 22px);
  padding: var(--pad);
  border: 2px solid var(--ink);
  outline: 1px solid var(--ink);
  outline-offset: 4px;
  background: color-mix(in srgb, var(--paper) 82%, transparent);
}
.sheet + .sheet, main .sheet { margin-top: clamp(26px, 4vw, 56px); }
.sheet--last { margin-top: clamp(26px, 4vw, 56px); }
.sheet__head { display: grid; grid-template-columns: 1fr auto; align-items: end; gap: 4px 24px; margin-bottom: clamp(20px, 3vw, 36px); }
.sheet__no { grid-column: 1 / -1; margin: 0; }
.sheet__no, .label, .rail, .titleblock dt, .bom th, .elabel, .board__dim, .gate__status {
  font-size: 0.74rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--blue); font-weight: 500;
}
.sheet__tag { margin: 0; color: var(--ink-2); font-size: 1.05rem; text-align: right; padding-bottom: 0.5em; }

/* Lettering sits between its guide lines, the way it is practiced. */
.lettering {
  margin: 0;
  font-weight: 300;
  font-size: clamp(2.5rem, 7.4vw, 5.6rem);
  line-height: 1;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.14em 0 0.1em;
  background:
    linear-gradient(var(--blue-line-2), var(--blue-line-2)) 0 0.13em / 100% 1px no-repeat,
    linear-gradient(var(--blue-line-2), var(--blue-line-2)) 0 calc(100% - 0.13em) / 100% 1px no-repeat;
}
h2.lettering { font-size: clamp(2rem, 5.4vw, 4rem); }
.label { margin: 0 0 8px; font-family: inherit; }

/* ---------- rail ---------- */
.rail { display: flex; justify-content: space-between; align-items: baseline; gap: 16px; flex-wrap: wrap; margin-bottom: clamp(14px, 2.4vw, 30px); }
.rail a { text-decoration: none; padding: 6px 0; display: inline-block; }
.rail__mark { color: var(--ink); font-weight: 700; letter-spacing: 0.14em; }
.rail__mark span { font-weight: 400; color: var(--blue); }
.rail ol { display: flex; gap: clamp(10px, 2vw, 26px); list-style: none; margin: 0; padding: 0; flex-wrap: wrap; counter-reset: s; }
.rail li { counter-increment: s; }
.rail li a::before { content: counter(s) '\00a0'; color: var(--ink-2); }

/* ---------- hero ---------- */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.42fr) minmax(0, 1fr);
  grid-template-areas:
    'head  lede'
    'board loop'
    'board gate'
    'board log'
    'bom   tb'
    'fine  fine';
  gap: 14px clamp(20px, 3vw, 44px);
  align-items: start;
}
.hero__head { grid-area: head; align-self: end; }
.lede { grid-area: lede; align-self: end; max-width: 58ch; margin: 0; font-size: clamp(0.98rem, 1.12vw, 1.08rem); line-height: 1.45; }
.board { grid-area: board; margin: 0; min-width: 0; align-self: stretch; display: flex; flex-direction: column; }
/* The paper is at least 4:3, and grows to fill the column beside the loop. */
.board__paper { position: relative; overflow: hidden; flex: 1 1 auto; border: var(--hair) solid var(--ink); background: var(--paper); }
.board__paper::before { content: ''; display: block; padding-top: 75%; }

/* Pickers: a row of drawer tabs. The chosen one is inked in. */
.picker { border: 0; margin: 0 0 8px; padding: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 6px; min-width: 0; }
.picker legend { float: left; padding: 0; margin-right: 6px; font-size: 0.74rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--blue); font-weight: 500; }
.picker label { cursor: pointer; }
.picker input { position: absolute; opacity: 0; width: 1px; height: 1px; }
.picker span { display: block; padding: 7px 11px; min-height: 36px; border: var(--hair) solid var(--ink); border-radius: 3px 3px 0 0; background: var(--paper); font-size: 0.86rem; font-weight: 600; letter-spacing: 0.03em; line-height: 1.3; }
.picker label:hover span { border-color: var(--red); }
.picker input:checked + span { background: var(--ink); color: var(--paper); }
.picker input:focus-visible + span { outline: 2px solid var(--red); outline-offset: 2px; }
#sheet-canvas { position: absolute; inset: 0; display: block; width: 100%; height: 100%; touch-action: pan-y; cursor: grab; }
#sheet-canvas:active { cursor: grabbing; }
.board__dim { position: absolute; left: 10px; top: 8px; margin: 0; display: flex; gap: 14px; pointer-events: none; }
.board__hint { position: absolute; left: 10px; right: 10px; bottom: 8px; margin: 0; font-size: 0.9rem; color: var(--ink-2); pointer-events: none; }
.board__hint i { color: var(--red); font-style: normal; }

.stamp {
  position: absolute; right: 7%; top: 12%;
  padding: 8px 16px 6px;
  border: 4px double var(--red); border-radius: 6px;
  color: var(--red); text-align: center; text-transform: uppercase; letter-spacing: 0.16em;
  transform: rotate(-9deg) scale(1.7); opacity: 0; pointer-events: none;
  mix-blend-mode: multiply;
}
.stamp b { display: block; font-size: clamp(1.3rem, 2.6vw, 2.1rem); font-weight: 800; line-height: 1.05; }
.stamp span { font-size: 0.72rem; font-weight: 600; }
.stamp--ink { border-color: var(--ink); color: var(--ink); }
.stamp.is-on { opacity: 0.88; transform: rotate(-9deg) scale(1); transition: transform 0.16s cubic-bezier(0.2, 1.4, 0.4, 1), opacity 0.08s; }

.gate { grid-area: gate; }
.gate__status { margin: 0 0 8px; min-height: 1.4em; color: var(--ink); }
.gate__buttons { display: flex; gap: 10px; flex-wrap: wrap; }
.btn {
  font: 600 1rem/1 var(--font); letter-spacing: 0.04em;
  display: inline-flex; align-items: center; gap: 9px;
  padding: 13px 18px; min-height: 48px;
  border: 2px solid var(--ink); border-radius: 4px;
  background: var(--paper); color: var(--ink); cursor: pointer;
  box-shadow: 3px 3px 0 var(--ink);
  transition: transform 0.08s, box-shadow 0.08s;
}
.btn svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
.btn:hover:not(:disabled) { transform: translate(-1px, -1px); box-shadow: 4px 4px 0 var(--ink); }
.btn:active:not(:disabled) { transform: translate(2px, 2px); box-shadow: 1px 1px 0 var(--ink); }
.btn:disabled { opacity: 0.42; cursor: default; box-shadow: none; }
[hidden] { display: none !important; }
.btn--red { border-color: var(--red); color: var(--red); box-shadow: 3px 3px 0 var(--red); }
.btn--red:hover:not(:disabled) { box-shadow: 4px 4px 0 var(--red); color: var(--red); }
.btn--ink { background: var(--ink); color: var(--paper); box-shadow: 3px 3px 0 var(--blue); }
.btn--ink:hover:not(:disabled) { box-shadow: 4px 4px 0 var(--blue); }
.btn--small { padding: 8px 12px; min-height: 40px; font-size: 0.88rem; margin-top: 10px; }
.gate.is-waiting .btn { animation: nudge 1.6s ease-in-out 2; }
@keyframes nudge { 0%, 100% { transform: none; } 50% { transform: translateY(-3px); } }

.loop { grid-area: loop; margin: 0; min-width: 0; }
.brakes { list-style: none; margin: 2px 0 6px; padding: 0; display: flex; flex-wrap: wrap; gap: 5px 6px; font-size: 0.74rem; letter-spacing: 0.1em; text-transform: uppercase; }
.brakes::before { content: 'Stops'; color: var(--blue); font-weight: 500; letter-spacing: 0.14em; padding: 3px 2px 3px 0; }
.brakes li { padding: 3px 8px; border: 1px solid var(--ink-2); border-radius: 999px; color: var(--ink); background: var(--paper); }
.brakes li.is-idle { border-style: dashed; color: var(--ink-2); }
.brakes li.is-person { border-color: var(--red); color: var(--red); }
.brakes li.is-fired { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.brakes li.is-person.is-fired { background: var(--red); border-color: var(--red); color: var(--paper); }
.loop svg, .lane svg { display: block; width: 100%; height: auto; overflow: visible; }
.loop figcaption, .lane figcaption, .embed figcaption { font-size: 0.9rem; color: var(--ink-2); margin-top: 6px; }
.edge { fill: none; stroke: var(--ink); stroke-width: 1.4; }
.edge--red { stroke: var(--red); stroke-dasharray: 5 4; }
.elabel { font-family: var(--font); font-size: 10.5px; fill: var(--blue); letter-spacing: 0.1em; }
.elabel--red { fill: var(--red); }
.node rect, .node path, .node circle { fill: var(--paper); stroke: var(--ink); stroke-width: 1.5; transition: fill 0.2s; }
.node text { font-family: var(--font); font-size: 13.5px; font-weight: 600; text-anchor: middle; fill: var(--ink); letter-spacing: 0.06em; transition: fill 0.2s; }
.node text.small { font-size: 11px; letter-spacing: 0.03em; }
.node text.sub { font-size: 10.5px; font-weight: 400; fill: var(--ink-2); letter-spacing: 0.1em; }
.node--you path, .node--human-gate path { stroke: var(--red); }
.node--you text, .node--human-gate text { fill: var(--red); }
.node.is-on rect, .node--check.is-on path { fill: var(--ink); }
.node.is-on text { fill: var(--paper); }
.node--you.is-on path, .node--human-gate.is-on path { fill: var(--red); }
.node--stop.is-on circle:last-child { fill: var(--ink); }
.token { fill: var(--red); stroke: var(--paper); stroke-width: 2; }

.log { grid-area: log; min-width: 0; }
.log h2 { margin-bottom: 4px; }
.log ol {
  list-style: none; margin: 0; padding: 6px 10px; height: 13.2em; overflow-y: auto;
  border: var(--hair) solid var(--ink); background: var(--paper);
  background-image: linear-gradient(transparent calc(1.65em - 1px), var(--blue-line) calc(1.65em - 1px));
  background-size: 100% 1.65em; background-attachment: local;
  font-size: 0.9rem; line-height: 1.65em;
}
.log li { display: grid; grid-template-columns: 2.9em 6.3em 1fr; gap: 0 6px; }
.log li b { font-weight: 700; }
.log li i { font-style: normal; color: var(--blue); }
.log li.is-you i, .log li.is-you span { color: var(--red); }
.log li.is-fail span::after { content: ' ✕'; color: var(--red); }
.log li.is-pass span::after { content: ' ✓'; }

.bom { grid-area: bom; border-collapse: collapse; width: 100%; font-size: 0.92rem; }
.bom th, .bom td { border: var(--hair) solid var(--ink); padding: 5px 10px; text-align: left; background: var(--paper); }
.bom td:nth-child(n + 3), .bom thead th:nth-child(n + 3) { text-align: right; width: 5.4em; }
.bom__total th { text-transform: none; letter-spacing: 0.04em; font-size: 0.92rem; color: var(--ink); font-weight: 600; }
.bom__total td { font-weight: 700; text-align: right; white-space: nowrap; }
.bom__total td.is-short { color: var(--red); }
.bom tfoot tr:last-child td { text-align: left; width: auto; color: var(--ink-2); font-size: 0.86rem; line-height: 1.45; }

.titleblock { grid-area: tb; margin: 0; display: grid; grid-template-columns: 1fr 1fr; border: 2px solid var(--ink); background: var(--paper); }
.titleblock > div { padding: 5px 10px 7px; border: 0.6px solid var(--ink); min-width: 0; }
.titleblock .tb--wide { grid-column: 1 / -1; }
.titleblock dt { font-size: 0.66rem; }
.titleblock dd { margin: 0; font-weight: 600; overflow-wrap: anywhere; }
.titleblock dd.is-blank { color: var(--ink-2); font-weight: 400; }
.titleblock dd.is-signed { color: var(--red); }
.fine { grid-area: fine; margin: 6px 0 0; font-size: 0.92rem; color: var(--ink-2); max-width: 96ch; }

/* ---------- content sheets ---------- */
.cols { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: clamp(20px, 4vw, 56px); align-items: start; }
.prose { max-width: 62ch; }
.mine { font-weight: 700; text-decoration: underline; text-decoration-color: var(--red); text-decoration-thickness: 2px; text-underline-offset: 4px; }
.links { display: flex; flex-wrap: wrap; gap: 6px 20px; margin-top: 1.1em; }
.link { font-weight: 600; padding: 6px 0; }
.link::after { content: ' →'; color: var(--red); }

.embed { margin: 0; }
.embed__frame {
  position: relative; aspect-ratio: 4 / 3; border: var(--hair) solid var(--ink); background: var(--paper);
  display: grid; place-content: center; justify-items: center; gap: 12px; padding: 20px; text-align: center; overflow: hidden;
}
.embed__frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; color-scheme: light; }
.embed__ghost { position: absolute; inset: 0; width: 100%; height: 100%; opacity: 0.5; }
.embed__ghost ellipse { fill: none; stroke: var(--ink-2); stroke-width: 0.8; stroke-dasharray: 3 3; }
.cl { stroke: var(--blue); stroke-width: 0.6; stroke-dasharray: 12 3 2 3; fill: none; }
.embed__frame .btn, .embed__note { position: relative; }
.embed__note { margin: 0; max-width: 34ch; font-size: 0.88rem; color: var(--ink-2); background: var(--paper); padding: 2px 6px; }

.plates { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(16px, 2.4vw, 32px); margin-top: clamp(28px, 4vw, 52px); }
.plate { border-top: 2px solid var(--ink); padding-top: 12px; }
.plate p { font-size: 0.98rem; }
.plate__art { display: block; width: 100%; height: auto; margin: 4px 0 10px; }
.pencil { fill: none; stroke: var(--ink); stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; }
.pencil .red, .pencil.red { stroke: var(--red); }
.ptext { font-family: var(--font); font-size: 13px; font-weight: 600; fill: var(--ink); letter-spacing: 0.06em; }
.dimline { fill: none; stroke: var(--blue); stroke-width: 1; }
.dimline .fillb { fill: var(--blue); stroke: none; }
.dtext { font-family: var(--font); font-size: 11.5px; fill: var(--blue); letter-spacing: 0.12em; text-transform: uppercase; }
.drawer-labels { list-style: none; margin: 4px 0 0; padding: 0; display: grid; gap: 7px; }
.drawer-labels a { display: grid; grid-template-columns: 7.6em 1fr; gap: 10px; align-items: baseline; padding: 8px 10px; border: var(--hair) solid var(--ink); border-left-width: 6px; background: var(--paper); text-decoration: none; min-height: 44px; }
.drawer-labels a:hover { border-color: var(--red); }
.drawer-labels b { font-weight: 700; letter-spacing: 0.02em; }
.drawer-labels span { font-size: 0.92rem; color: var(--ink-2); }

.lane { margin: 0; }
.back { stroke-dasharray: 5 4; }
.strike { stroke: var(--red); stroke-width: 2.4; fill: none; stroke-linecap: round; stroke-dasharray: 340; stroke-dashoffset: 340; transition: stroke-dashoffset 0.35s ease-out; }
#stop-note { opacity: 0; transition: opacity 0.2s 0.25s; }
.is-erased .strike { stroke-dashoffset: 0; }
.is-erased #stop-note { opacity: 1; }
.is-erased .back { stroke: var(--red); }
.limits { margin: 1.2em 0; padding: 12px 16px; border-left: 3px solid var(--red); background: var(--paper); }
.limits p:last-child { margin: 0; }

.cards { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: clamp(14px, 2vw, 26px); }
.cards li { border: var(--hair) solid var(--ink); background: var(--paper); padding: 16px 16px 12px; display: flex; flex-direction: column; box-shadow: 4px 4px 0 var(--paper-2); }
.cards svg { width: 64px; height: 40px; margin-bottom: 10px; }
.cards h3 { margin: 0 0 6px; font-size: 1.2rem; font-weight: 700; letter-spacing: 0.03em; }
.cards p { font-size: 0.96rem; }
.cards .links { margin-top: auto; }

.titleblock--links { grid-area: auto; }
.titleblock--links a { text-decoration: none; display: block; padding: 6px 0; }
.titleblock--links a:hover { text-decoration: underline; }
.colophon { margin: clamp(24px, 4vw, 44px) 0 0; font-size: 0.86rem; color: var(--ink-2); }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.defs { position: absolute; }

/* Sheet 2 and 3 additions */
.plates--four { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.kitlist { list-style: none; margin: 4px 0 12px; padding: 0; }
.kitlist li { display: grid; grid-template-columns: 6.6em 1fr; gap: 10px; padding: 7px 0; border-bottom: 1px dashed var(--ink-2); align-items: baseline; }
.kitlist a { font-weight: 700; }
.kitlist span { font-size: 0.92rem; color: var(--ink-2); }
.graphs { margin-top: clamp(28px, 4vw, 52px); border-top: 2px solid var(--ink); padding-top: 12px; }
.graphs__lede { max-width: 96ch; }
.graphs code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.86em; background: var(--paper-2); padding: 1px 5px; white-space: nowrap; }
.graphs__scroll { overflow-x: auto; }
.graphs table { border-collapse: collapse; width: 100%; min-width: 760px; font-size: 0.94rem; }
.graphs th, .graphs td { border: var(--hair) solid var(--ink); padding: 8px 10px; text-align: left; vertical-align: top; background: var(--paper); }
.graphs thead th { font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--blue); font-weight: 500; }
.graphs tbody th { white-space: nowrap; font-weight: 700; }
.graphs td small { display: block; color: var(--ink-2); font-size: 0.82rem; line-height: 1.35; margin-top: 2px; }
.graphs td:last-child { white-space: nowrap; }
.graphs td:last-child a { display: block; padding: 3px 0; }
.graphs tr.is-running th { box-shadow: inset 6px 0 0 var(--red); padding-left: 16px; }
.graphs__note { margin: 12px 0 0; font-size: 0.92rem; color: var(--ink-2); }

/* Sheet 4: two worked pieces, a flat list, and the capstone last */
.features { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(16px, 2.4vw, 32px); margin-bottom: clamp(18px, 2.6vw, 32px); }
.feature { border: var(--hair) solid var(--ink); background: var(--paper); padding: 18px; display: grid; gap: 14px; align-content: start; box-shadow: 4px 4px 0 var(--paper-2); }
.feature h3 { margin: 0 0 6px; font-size: 1.45rem; font-weight: 700; letter-spacing: 0.03em; }
.feature__art { border-top: 1px dashed var(--ink-2); padding-top: 14px; }
.feature__caption { margin: 10px 0 0; font-size: 0.9rem; color: var(--ink-2); }
.stages { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; counter-reset: st; }
.stages li { counter-increment: st; }
.stages button { width: 100%; min-height: 64px; padding: 8px 6px; font: inherit; text-align: left; cursor: pointer; color: var(--ink); background: var(--paper); border: var(--hair) solid var(--ink); border-radius: 3px; display: grid; gap: 2px; }
.stages button::before { content: counter(st); font-size: 0.7rem; color: var(--blue); letter-spacing: 0.14em; }
.stages b { font-size: 0.95rem; font-weight: 700; overflow-wrap: anywhere; }
.stages i { font-style: normal; font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-2); }
.stages button:hover { border-color: var(--red); }
.stages button.is-stale { border-color: var(--red); background: repeating-linear-gradient(-45deg, transparent 0 6px, rgba(197, 40, 28, 0.13) 6px 7.5px), var(--paper); }
.stages button.is-stale i { color: var(--red); font-weight: 700; }
.fields { margin: 0; display: grid; gap: 8px; }
.fields > div { display: grid; grid-template-columns: 7.2em minmax(0, 1fr); align-items: stretch; border: var(--hair) solid var(--ink); }
.fields dt { padding: 8px 10px; font-size: 0.7rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--blue); border-right: var(--hair) solid var(--ink); background: var(--paper-2); }
.fields dd { margin: 0; padding: 8px 10px; font-weight: 600; overflow-wrap: anywhere; min-height: 2.6em; }
.fields div:last-child dd { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.82rem; font-weight: 400; }
.feature__caption .btn { margin: 0 8px 0 0; vertical-align: middle; }
.capstone { margin: clamp(18px, 2.6vw, 32px) 0 0; padding-top: 12px; border-top: 1px dashed var(--ink-2); font-size: 0.94rem; color: var(--ink-2); max-width: 110ch; }
.capstone b { color: var(--ink); }

/* ---------- narrower ---------- */
@media (max-width: 1020px) {
  .hero {
    grid-template-columns: minmax(0, 1fr);
    grid-template-areas: 'head' 'lede' 'board' 'gate' 'loop' 'log' 'bom' 'tb' 'fine';
  }
  .loop { align-self: auto; max-width: 520px; }
  .cols, .cols--flip { grid-template-columns: minmax(0, 1fr); }
  .plates { grid-template-columns: minmax(0, 1fr); }
  .cards { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .plates--four { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .features { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 560px) {
  body { font-size: 1rem; }
  .sheet { margin: 8px; outline-offset: 3px; }
  .sheet__head { grid-template-columns: 1fr; }
  .sheet__tag { text-align: left; }
  .board__paper::before { padding-top: 100%; }
  .board__hint { font-size: 0.82rem; }
  .gate__buttons { flex-direction: column; }
  .gate__buttons .btn { justify-content: center; }
  .rail { margin-bottom: 8px; }
  .rail a { padding: 3px 0; }
  .lede { font-size: 0.95rem; }
  .cards { grid-template-columns: minmax(0, 1fr); }
  .plates--four { grid-template-columns: minmax(0, 1fr); }
  .lane { overflow-x: auto; }
  .lane svg { min-width: 540px; }
  .rail ol { gap: 4px 14px; }
  .log li { grid-template-columns: 2.5em 5.6em 1fr; font-size: 0.86rem; }
  /* The whole graph stays on screen; its lettering is drawn larger to survive the reduction. */
  .loop .node text { font-size: 15.5px; letter-spacing: 0.02em; }
  .loop .node text.small { font-size: 12.5px; letter-spacing: 0; }
  .loop .elabel { font-size: 12.5px; letter-spacing: 0.06em; }
  .picker span { padding: 7px 9px; font-size: 0.82rem; }
  .stages { grid-template-columns: 1fr 1fr; }
  .fields > div { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .stamp.is-on, .btn, .strike, #stop-note, .node rect, .node path, .node text { transition: none; }
  .gate.is-waiting .btn { animation: none; }
}