/* Cerno-Folio. A chess book typeset in the browser.
 * Paper and ink, one red pencil. Radius 0. Hairlines. Motion: quiet, bookish. */

:root {
  /* hueso B: warm bone paper (#f5efe3 / #efe7da / #e6ded0) */
  --paper: #f5efe3;
  --paper-2: #efe7da;
  --paper-3: #e6ded0;
  --rule: oklch(0.82 0.016 80);
  --rule-2: oklch(0.885 0.014 80);
  --ink: oklch(0.21 0.012 260);
  --ink-2: oklch(0.4 0.01 260);
  --ink-3: oklch(0.56 0.008 260);
  --red: oklch(0.53 0.19 27);
  --red-wash: oklch(0.53 0.19 27 / 0.09);
  --hatch: oklch(0.21 0.012 260 / 0.62);
  --pen-red: var(--red);
  --pen-ink: var(--ink);
  --sq-light: var(--paper);
  --serif: "Literata", Georgia, serif;
  --sans: "Funnel Sans", ui-sans-serif, system-ui, sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  --ease-out: cubic-bezier(.23, 1, .32, 1);
  --ease-io: cubic-bezier(.77, 0, .175, 1);
  --dur-fast: 90ms; --dur-mod: 160ms; --dur-slow: 240ms;
  /* motion: quiet entrances (fade up out of a soft blur), drawn rules, faster exits */
  --ease-draw: cubic-bezier(.33, 0, .1, 1);
  --dur-in: 560ms; --dur-rise: 700ms; --dur-draw: 800ms; --dur-out: 160ms;
  --rise: 8px; --blur: 4px;
  --gutter: 20px;
  --dock-h: 60px;
  --head-h: 52px;
  color-scheme: light;
}
:root[data-theme="dark"] {
  --paper: oklch(0.205 0.006 260);
  --paper-2: oklch(0.235 0.007 260);
  --paper-3: oklch(0.27 0.008 260);
  --rule: oklch(0.38 0.008 260);
  --rule-2: oklch(0.3 0.008 260);
  --ink: oklch(0.935 0.006 90);
  --ink-2: oklch(0.78 0.006 90);
  --ink-3: oklch(0.62 0.006 90);
  --red: oklch(0.69 0.165 27);
  --red-wash: oklch(0.69 0.165 27 / 0.14);
  --hatch: oklch(0.935 0.006 90 / 0.42);
  --sq-light: oklch(0.29 0.008 260);
  color-scheme: dark;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]):not([data-theme="dark"]) {
    --paper: oklch(0.205 0.006 260); --paper-2: oklch(0.235 0.007 260); --paper-3: oklch(0.27 0.008 260);
    --rule: oklch(0.38 0.008 260); --rule-2: oklch(0.3 0.008 260);
    --ink: oklch(0.935 0.006 90); --ink-2: oklch(0.78 0.006 90); --ink-3: oklch(0.62 0.006 90);
    --red: oklch(0.69 0.165 27); --red-wash: oklch(0.69 0.165 27 / 0.14); --hatch: oklch(0.935 0.006 90 / 0.42);
    --sq-light: oklch(0.29 0.008 260); color-scheme: dark;
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; scroll-padding-top: calc(var(--head-h) + 12px); }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 400 17px/1.55 var(--serif); font-optical-sizing: auto;
  font-variant-numeric: oldstyle-nums proportional-nums;
  -webkit-font-smoothing: antialiased; text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
::selection { background: var(--red-wash); color: var(--ink); }
a { color: inherit; }
button, input, select, textarea { font: inherit; color: inherit; }
img, svg { display: block; }
h1, h2, h3, h4 { font-weight: 400; margin: 0; text-wrap: balance; }
p { margin: 0; text-wrap: pretty; }
em, i { font-style: italic; }
.num, .tab { font-variant-numeric: lining-nums tabular-nums; }
.osf { font-variant-numeric: oldstyle-nums proportional-nums; }
.sc { font-variant-caps: all-small-caps; letter-spacing: .055em; font-variant-numeric: lining-nums; }
.vh { position: absolute !important; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: 10px 14px; z-index: 100; font: 500 14px var(--sans); }
.skip:focus { left: 8px; }
:focus-visible { outline: 2px solid var(--red); outline-offset: 2px; }

/* ---------- Figurines (masks from figurines.css) ---------- */
.fg { display: inline-block; width: .86em; height: .86em; background: currentColor; vertical-align: -0.08em; margin-right: .02em;
  -webkit-mask-size: 100% 100%; mask-size: 100% 100%; -webkit-mask-repeat: no-repeat; mask-repeat: no-repeat; }
.san { white-space: nowrap; font-variant-numeric: lining-nums; }
.san.bad { color: var(--red); }
.gl { font-weight: 650; letter-spacing: -.02em; margin-left: .02em; }
.bad .gl, .gl.bad { color: var(--red); }

/* ---------- Chrome: running head, ribbon, dock ---------- */
.runhead {
  position: sticky; top: 0; z-index: 30; height: var(--head-h);
  display: flex; align-items: center; gap: 8px; padding: 0 calc(var(--gutter) - 10px) 0 var(--gutter);
  background: var(--paper); border-bottom: 1px solid transparent; transition: border-color var(--dur-mod);
}
.runhead.scrolled { border-bottom-color: var(--rule); }
.runhead .wm { font: italic 500 22px/1 var(--serif); text-decoration: none; letter-spacing: -.01em; padding: 10px 0; }
.runhead .where { flex: 1; min-width: 0; font-size: 15px; color: var(--ink-2); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.runhead .where .sep { color: var(--rule); margin: 0 6px; }
.lang { display: flex; align-items: center; }
.lang button { appearance: none; border: 0; background: none; height: 44px; min-width: 40px; padding: 0 6px; font: 500 13px var(--sans); letter-spacing: .06em; color: var(--ink-3); cursor: pointer; position: relative; }
.lang button[aria-pressed="true"] { color: var(--ink); }
.lang button[aria-pressed="true"]::after { content: ""; position: absolute; left: 10px; right: 10px; bottom: 9px; height: 2px; background: var(--red); border-radius: 2px; transform: rotate(-2deg); }
.lang .bar { width: 1px; height: 14px; background: var(--rule); }

.dock {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 40;
  display: grid; grid-template-columns: repeat(4, 1fr);
  height: calc(var(--dock-h) + env(safe-area-inset-bottom)); padding-bottom: env(safe-area-inset-bottom);
  background: var(--paper); border-top: 1px solid var(--rule);
}
.dock a { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 3px; text-decoration: none; color: var(--ink-3); font: 500 12.5px/1 var(--sans); letter-spacing: .01em; position: relative; transition: transform var(--dur-fast) var(--ease-out); }
.dock a:active { transform: scale(.96); }
.dock a .dk-ic { font: 400 21px/1 var(--serif); color: var(--ink-2); height: 22px; display: flex; align-items: center; }
.dock a[aria-current="page"] { color: var(--ink); }
.dock a[aria-current="page"] .dk-ic { color: var(--ink); }
/* one red indicator for the dock; it slides between items (core.js keeps its previous position) */
.dock .dk-ind { position: absolute; top: -1px; left: 0; width: 25%; height: 2px; transform: translateX(calc(var(--i, 0) * 100%)); pointer-events: none; }
.dock .dk-ind::before { content: ""; position: absolute; inset: 0 28%; background: var(--red); }
.dock .fg { width: 20px; height: 20px; }
body.no-dock .dock { display: none; }
body { padding-bottom: calc(var(--dock-h) + env(safe-area-inset-bottom)); }
body.no-dock { padding-bottom: 0; }

.ribbon { display: none; }

/* ---------- Page frames ---------- */
main { display: block; min-height: 60vh; }
.page { padding: 8px var(--gutter) 24px; max-width: 680px; margin: 0 auto; }
.spread { padding: 8px var(--gutter) 24px; }
.row + .row { margin-top: 32px; }
.r { margin-top: 18px; }
.desk-head { display: none; }

/* Typographic roles */
.kicker { font-variant-caps: all-small-caps; letter-spacing: .07em; font-size: 15px; color: var(--ink-2); font-variant-numeric: lining-nums; }
.kicker .red { color: var(--red); }
.title { font: 400 38px/1.06 var(--serif); letter-spacing: -.018em; margin-top: 6px; }
.title em { font-style: italic; }
.chno { font: italic 300 64px/0.9 var(--serif); color: var(--ink); letter-spacing: -.03em; font-variant-numeric: lining-nums; }
.lede { font-size: 19px; line-height: 1.5; margin-top: 18px; color: var(--ink); }
.lede .big { font-size: inherit; }
.prose p + p { margin-top: .8em; }
.prose { font-size: 17.5px; }
.dropcap::first-letter { float: left; font: 400 3.55em/0.82 var(--serif); margin: .07em .08em 0 -.02em; color: var(--ink); font-variant-numeric: lining-nums; }
.h2 { font: 400 26px/1.15 var(--serif); letter-spacing: -.012em; }
.h2 em { font-style: italic; }
.h3 { font: 600 19px/1.25 var(--serif); }
.secno { font-variant-numeric: lining-nums tabular-nums; color: var(--red); font-weight: 400; margin-right: .35em; }
.muted { color: var(--ink-2); }
.faint { color: var(--ink-3); }
.small { font-size: 14.5px; line-height: 1.45; }
hr.rule { border: 0; border-top: 1px solid var(--rule); margin: 32px 0; }
.orn { text-align: center; color: var(--ink-3); letter-spacing: .6em; margin: 36px 0; font-size: 15px; }

/* Hatched divider (desengs spacer, printed) */
.hatchrule { height: 10px; margin: 36px 0; background: repeating-linear-gradient(-45deg, var(--hatch) 0 1px, transparent 1px 5px); -webkit-mask-image: linear-gradient(90deg, #000 40%, transparent); mask-image: linear-gradient(90deg, #000 40%, transparent); opacity: .7; }

/* ---------- Buttons & links ---------- */
.btn {
  appearance: none; display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 48px; padding: 0 20px;
  border: 1px solid var(--ink); background: transparent; color: var(--ink); text-decoration: none; cursor: pointer;
  font: 500 15px/1 var(--sans); letter-spacing: .005em; border-radius: 0; white-space: nowrap;
  transition: transform var(--dur-fast) var(--ease-out), background-color var(--dur-mod), color var(--dur-mod);
}
.btn:active { transform: scale(.97); }
.btn.primary { background: var(--red); border-color: var(--red); color: var(--paper); }
.btn.ink { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.btn.ghost { border-color: var(--rule); }
.btn.sm { min-height: 44px; padding: 0 14px; font-size: 14px; }
.btn .arr { font-family: var(--serif); font-size: 18px; line-height: 0; }
@media (hover: hover) { .btn:hover { background: var(--paper-2); } .btn.primary:hover { background: color-mix(in oklch, var(--red) 88%, black); } .btn.ink:hover { background: color-mix(in oklch, var(--ink) 88%, var(--paper)); } }
.btn[disabled] { opacity: .45; cursor: default; }
.btnrow { display: flex; flex-wrap: wrap; gap: 10px; }
.paren { display: inline-flex; flex-wrap: wrap; gap: 2px 4px; }
.paren a, .paren button { appearance: none; position: relative; border: 0; background: none; padding: 10px 2px; min-height: 44px; cursor: pointer; text-decoration: none; color: var(--ink-2); font: 400 17px var(--serif); position: relative; }
.paren a::before, .paren button::before { content: "("; color: var(--ink-3); }
.paren a::after, .paren button::after { content: ")"; color: var(--ink-3); }
.paren [aria-pressed="true"], .paren [aria-current="true"] { color: var(--ink); }
.link { color: var(--ink); text-decoration: underline; text-decoration-color: var(--rule); text-underline-offset: 3px; text-decoration-thickness: 1px; }
@media (hover: hover) { .link:hover { text-decoration-color: var(--red); } }
.more { display: inline-flex; align-items: center; min-height: 44px; font: 500 14.5px var(--sans); color: var(--ink); text-decoration: none; gap: 8px; }
.more::after { content: "→"; font-family: var(--serif); color: var(--red); transition: transform var(--dur-mod) var(--ease-out); }
@media (hover: hover) { .more:hover::after { transform: translateX(3px); } }

/* Hand-drawn ring around a chosen word (red pencil marginalia applied to UI) */
.ring { position: relative; display: inline-block; }
.ring > svg, .paren > button > svg { position: absolute; left: -9%; top: -6%; width: 118%; height: 112%; overflow: visible; pointer-events: none; }
.ring > svg path, .paren > button > svg path { fill: none; stroke: var(--red); stroke-width: 1.6; stroke-linecap: round; vector-effect: non-scaling-stroke; stroke-dasharray: 1; stroke-dashoffset: 0; }
.ring.draw > svg path, .paren > button.draw > svg path { stroke-dashoffset: 1; animation: penDraw 520ms cubic-bezier(.45,.05,.3,1) forwards; }
@keyframes penDraw { to { stroke-dashoffset: 0; } }
.uline { background-image: linear-gradient(var(--red), var(--red)); background-size: 100% 1.5px; background-repeat: no-repeat; background-position: 0 92%; }

/* ---------- Leaders (table of contents) ---------- */
.toc { list-style: none; padding: 0; margin: 0; }
.tl { display: flex; align-items: baseline; gap: 8px; text-decoration: none; color: inherit; padding: 7px 0; min-height: 44px; }
.tl .t { min-width: 0; flex: 0 1 auto; }
.tl .ld { flex: 1 1 24px; min-width: 18px; height: 1em; position: relative; top: -.28em; background-image: radial-gradient(circle, var(--ink-3) .9px, transparent 1.1px); background-size: 6px 3px; background-repeat: repeat-x; background-position: left bottom; opacity: .75; transform-origin: left; }
.tl .v { flex: none; font-variant-numeric: lining-nums tabular-nums; }
.tl .v.prov { color: var(--ink-3); font-style: italic; }
.toc .ch { margin-top: 18px; }
.toc .ch > .tl { font-size: 21px; padding-top: 4px; }
.toc .ch > .tl .no { font: italic 400 21px var(--serif); width: 1.4em; flex: none; color: var(--ink); font-variant-numeric: lining-nums; }
.toc .ch > .tl .v { font-size: 19px; }
.toc .sub .tl { font-size: 16px; color: var(--ink-2); padding: 5px 0; min-height: 40px; padding-left: 1.75em; }
.toc .sub .tl .no { font-variant-numeric: lining-nums tabular-nums; color: var(--ink-3); width: 2.4em; flex: none; font-size: 14px; }
.toc .sub .tl .v { font-size: 15px; color: var(--ink-2); }
.toc .sub.ex .tl { font-style: italic; }
.toc .mag { height: 3px; background: var(--ink); margin: 0 0 2px 1.75em; transform-origin: left; }
.toc .mag.red { background: var(--red); }
.colhead { display: flex; justify-content: space-between; gap: 12px; font-size: 13px; color: var(--ink-3); border-bottom: 1px solid var(--rule); padding-bottom: 6px; }
.colhead span:last-child { text-align: right; }
@media (hover: hover) {
  .toc:has(.tl:hover) .tl:not(:hover) { opacity: .55; }
  .toc .tl { transition: opacity .2s; }
  .toc .tl:hover { transition-duration: 0s; }
}

/* ---------- Diagram (the signature) ---------- */
.dia { margin: 0; }
.dia-frame { display: grid; grid-template-columns: 14px 1fr; grid-template-rows: 1fr 16px; gap: 0 6px; }
.dia-ranks { display: grid; grid-template-rows: repeat(8, 1fr); align-items: center; justify-items: end; font: italic 400 11.5px/1 var(--serif); color: var(--ink-3); font-variant-numeric: lining-nums; }
.dia-files { grid-column: 2; display: grid; grid-template-columns: repeat(8, 1fr); justify-items: center; align-items: end; font: italic 400 11.5px/1 var(--serif); color: var(--ink-3); }
.dia-board { position: relative; box-shadow: 0 0 0 1px var(--ink), 0 0 0 3px var(--paper), 0 0 0 4.5px var(--ink); margin: 4.5px; }
.dia.small .dia-frame { grid-template-columns: 1fr; grid-template-rows: 1fr; }
.dia.small .dia-ranks, .dia.small .dia-files { display: none; }
.dia.small .dia-board { box-shadow: 0 0 0 1px var(--ink); margin: 1px; }
.dia figcaption { margin-top: 10px; font-size: 15px; line-height: 1.45; color: var(--ink); }
.dia figcaption .lab { font-variant-caps: all-small-caps; letter-spacing: .06em; font-weight: 600; font-variant-numeric: lining-nums; }
.dia figcaption .tp { font-variant-caps: all-small-caps; letter-spacing: .05em; color: var(--ink-2); }
.dia figcaption .src { display: block; color: var(--ink-2); font-size: 14px; margin-top: 2px; }
.dia-tools { margin-top: 6px; }
.dia-seg { display: grid; grid-template-columns: repeat(3, 1fr); border: 1px solid var(--ink); max-width: 440px; }
.dia-seg button { appearance: none; border: 0; background: none; min-height: 44px; padding: 0 6px; font: 500 13.5px/1.15 var(--sans); color: var(--ink); cursor: pointer; transition: background-color var(--dur-fast), color var(--dur-fast), transform var(--dur-fast) var(--ease-out); }
.dia-seg button + button { border-left: 1px solid var(--rule); }
.dia-seg button:active { transform: scale(.97); }
.dia-seg button.on { background: var(--ink); color: var(--paper); }
@media (hover: hover) { .dia-seg button:not(.on):hover { background: var(--paper-2); } }
.dia-nav { display: flex; gap: 20px; }
.dia-nav a { min-height: 40px; display: inline-flex; align-items: center; font: 400 14px var(--sans); color: var(--ink-2); text-decoration: underline; text-decoration-color: var(--rule); text-underline-offset: 3px; }
.dia-nav a::after { content: " →"; color: var(--red); margin-left: 3px; text-decoration: none; }
@media (hover: hover) { .dia-nav a:hover { color: var(--ink); text-decoration-color: var(--red); } }
.dia-line { min-height: 1.4em; font-size: 15px; color: var(--ink-2); margin-top: 6px; }
.dia-line .cur { color: var(--ink); background: var(--red-wash); box-shadow: 0 0 0 2px var(--red-wash); }
.dia-board[data-tap] { cursor: pointer; }

/* Board themes */
.cb { --cb-light: var(--sq-light); --cb-hl-last: color-mix(in oklch, var(--ink) 10%, transparent); --cb-hl-sel: var(--red-wash); --cb-hl-dot: color-mix(in oklch, var(--ink) 32%, transparent); }
html[data-board="print"] .cb { background: var(--sq-light) repeating-linear-gradient(-45deg, var(--hatch) 0 1px, transparent 1px 4.2px); }
html[data-board="print"] .cb-sq.d { background: transparent; }
html[data-board="grey"] .cb { --cb-dark: oklch(0.74 0.006 260); --cb-light: oklch(0.93 0.004 260); }
html[data-board="pencil"] .cb { --cb-dark: color-mix(in oklch, var(--ink) 16%, var(--paper)); }
html[data-board="wood"] .cb { --cb-light: #f0d9b5; --cb-dark: #b58863; }

/* ---------- Marginal notes (Maia levels) ---------- */
.note { border-left: 2px solid var(--ink); padding: 2px 0 2px 12px; font-size: 15px; line-height: 1.45; }
.note .nt { font-style: italic; font-weight: 600; display: block; }
.note.below { border-left-color: var(--red); }
.note.below .nt { color: var(--red); }
.note.hard { border-image: repeating-linear-gradient(-45deg, var(--ink) 0 1px, transparent 1px 3px) 0 0 0 2 / 0 0 0 4px; border-left-width: 4px; }
.note.out { border-left-style: dotted; border-left-color: var(--ink-3); }
.note.mid { border-left-color: var(--ink-3); }
.levtag { display: inline-flex; align-items: center; gap: 7px; font-size: 14px; font-style: italic; white-space: nowrap; }
.levtag i { width: 11px; height: 11px; display: inline-block; border: 1px solid var(--ink); flex: none; }
.levtag.below i { background: var(--ink); }
.levtag.hard i { background: repeating-linear-gradient(-45deg, var(--ink) 0 1px, transparent 1px 3px); }
.levtag.mid i { background: var(--paper-3); border-color: var(--ink-3); }
.levtag.out i { border-style: dotted; border-color: var(--ink-3); }
.levtag.below { color: var(--red); }

/* ---------- Split bar (Maia view of a finding) ---------- */
.split { margin-top: 14px; }
.split .bar { display: flex; height: 16px; border: 1px solid var(--ink); }
.split .bar > span { height: 100%; }
.split .bar .below { background: var(--ink); }
.split .bar .hard { background: repeating-linear-gradient(-45deg, var(--ink) 0 1px, transparent 1px 4px); }
.split .bar .mid { background: var(--paper-3); }
.split .bar .out { background: radial-gradient(circle, var(--ink-3) .8px, transparent 1px) 0 0 / 4px 4px; }
.split .bar > span + span { border-left: 1px solid var(--ink); }
.split .keys { display: grid; grid-template-columns: 1fr 1fr; gap: 6px 16px; margin-top: 10px; }
.split .keys .levtag { white-space: normal; }
.split .keys b { font-weight: 600; font-style: normal; font-variant-numeric: lining-nums tabular-nums; color: var(--ink); }

/* ---------- KPIs as type ---------- */
.figs { display: flex; flex-wrap: wrap; gap: 18px 28px; margin-top: 22px; padding: 14px 0; border-top: 1px solid var(--rule); border-bottom: 1px solid var(--rule); }
.figs > div { min-width: 0; }
.figs b { display: block; font: 400 30px/1 var(--serif); font-variant-numeric: lining-nums tabular-nums; letter-spacing: -.01em; }
.figs span { display: block; font-size: 13.5px; color: var(--ink-2); margin-top: 6px; line-height: 1.3; max-width: 13em; }
.figs .red b { color: var(--red); }

/* ---------- Figures (charts) ---------- */
.fig { margin: 0; }
.fig .ft { font-variant-caps: all-small-caps; letter-spacing: .06em; font-weight: 600; font-size: 15px; font-variant-numeric: lining-nums; }
.fig .ft .fno { color: var(--red); margin-right: .3em; }
.fig svg { width: 100%; height: auto; overflow: visible; font-family: var(--serif); }
.fig figcaption { font-size: 14.5px; line-height: 1.45; color: var(--ink-2); margin-top: 10px; }
.fig .readout { font-size: 15px; min-height: 2.9em; margin-top: 8px; font-variant-numeric: lining-nums tabular-nums; }
.fig .readout b { font-weight: 600; }
.ax text { fill: var(--ink-3); font-size: 12.5px; font-style: italic; font-variant-numeric: lining-nums; }
.ax line, .ax path { stroke: var(--rule); stroke-width: 1; }
.fig .scrub { touch-action: none; cursor: crosshair; }
/* Maia figure: readable axes + a soft entrance (curve draws, the rest fades up out of a blur) */
.mf-ax text { font-size: 13px; fill: var(--ink-2); }
.mf-ax .axt { font-size: 12.5px; font-style: italic; fill: var(--ink-3); letter-spacing: .01em; }
.mf-ax line.base, .mf-ax line.tk { stroke: var(--ink-3); }
.mf-lbl { font-size: 13.5px; font-style: italic; paint-order: stroke; stroke: var(--paper); stroke-width: 4px; stroke-linejoin: round; }
.mfig .mf-good { stroke-dasharray: 1; stroke-dashoffset: 1; }
.mfig .mf-area, .mfig .mf-played { clip-path: inset(0 100% 0 0); }
.mfig .mf-ax, .mfig .mf-me, .mfig .mf-lbl, .mfig .cur { opacity: 0; }
.mfig .mf-lbl, .mfig .mf-me { filter: blur(4px); }
.mfig.in .mf-ax { opacity: 1; transition: opacity 500ms var(--ease-out); }
.mfig.in .mf-good { stroke-dashoffset: 0; transition: stroke-dashoffset 1100ms cubic-bezier(.33, 0, .1, 1) 120ms; }
.mfig.in .mf-area { clip-path: inset(0 0 0 0); transition: clip-path 1100ms cubic-bezier(.33, 0, .1, 1) 120ms; }
.mfig.in .mf-played { clip-path: inset(0 0 0 0); transition: clip-path 1100ms cubic-bezier(.33, 0, .1, 1) 260ms; }
.mfig.in .mf-me { opacity: 1; filter: none; transition: opacity 500ms var(--ease-out) 900ms, filter 600ms var(--ease-out) 900ms; }
.mfig.in .mf-lbl { opacity: 1; filter: none; transition: opacity 600ms var(--ease-out) 1050ms, filter 700ms var(--ease-out) 1050ms; }
.mfig.in .cur { opacity: 1; transition: opacity 300ms 1300ms; }
.mfig.still * { transition: none !important; }
.fig.maia .readout { transition: opacity 400ms var(--ease-out); }
.fig.maia:has(.mfig:not(.in)) .readout { opacity: 0; }

/* ---------- Contents page ---------- */
.verdict { font: 400 30px/1.14 var(--serif); letter-spacing: -.015em; margin-top: 14px; }
.verdict em { font-style: italic; color: var(--red); }
.verdict2 { margin-top: 12px; font-size: 18px; color: var(--ink-2); }
.meta { font-size: 14.5px; color: var(--ink-2); margin-top: 10px; font-variant-numeric: lining-nums; }
.pref { list-style: none; padding: 0; margin: 10px 0 0; counter-reset: pref; }
.pref li { display: grid; grid-template-columns: 2em 1fr; padding: 10px 0; border-top: 1px solid var(--rule-2); }
.pref li:first-child { border-top: 0; }
.pref .rn { font: italic 400 17px var(--serif); color: var(--red); padding-top: 1px; }
.pref a { text-decoration: none; display: block; }
.pref .pt, .pref .pr { display: block; }
.pref .pt { font-size: 18px; line-height: 1.3; }
.pref .pr { font-size: 14px; color: var(--ink-2); margin-top: 3px; font-variant-numeric: lining-nums; }

/* ---------- Sections in chapters ---------- */
.sect { padding-top: 8px; }
.sect + .sect { margin-top: 44px; padding-top: 32px; border-top: 1px solid var(--rule); }
.sect .h2 { margin-bottom: 12px; }
.claim { font-size: 18px; line-height: 1.52; }
.claim b, .claim strong { font-weight: 600; font-variant-numeric: lining-nums; }

/* Evidence list */
.evi { display: grid; gap: 40px; margin-top: 24px; }

/* Mini-diagram strips */
.strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px 12px; margin-top: 16px; }
.strip a { text-decoration: none; color: inherit; display: block; }
.strip .cap { font-size: 13px; margin-top: 7px; line-height: 1.3; font-variant-numeric: lining-nums; color: var(--ink-2); }
.strip .cap b { color: var(--ink); font-weight: 600; }

/* ---------- Tables (repertoire, appendix) ---------- */
table.bk { width: 100%; border-collapse: collapse; font-size: 15px; font-variant-numeric: lining-nums tabular-nums; }
table.bk th { font-variant-caps: all-small-caps; letter-spacing: .05em; font-weight: 600; color: var(--ink-2); text-align: left; padding: 6px 8px 6px 0; border-bottom: 1px solid var(--ink); font-size: 14px; }
table.bk td { padding: 9px 8px 9px 0; border-bottom: 1px solid var(--rule-2); vertical-align: baseline; }
table.bk td.r, table.bk th.r { text-align: right; padding-right: 0; }
table.bk tr.hot td { background: var(--red-wash); }
table.bk a { text-decoration: none; }

/* Crosstable */
.hitgrid { max-width: 340px; }
.hitgrid a { font-size: 11.5px; color: var(--ink-3); }
.hitgrid a.l::after { inset: auto auto 0 0; width: 0; height: 0; opacity: 1; background: none; border-left: 6px solid var(--ink-3); border-top: 6px solid transparent; }
.hitgrid a.h1 { background: color-mix(in oklch, var(--ink) 14%, var(--paper)); color: var(--ink); }
.hitgrid a.h2 { background: color-mix(in oklch, var(--ink) 26%, var(--paper)); color: var(--ink); }
.hitgrid a.h3 { background: color-mix(in oklch, var(--ink) 42%, var(--paper)); color: var(--ink); font-weight: 600; }
.hitgrid a.h4 { background: color-mix(in oklch, var(--ink) 62%, var(--paper)); color: var(--paper); font-weight: 600; }
.hitgrid a.hit.l::after { border-left-color: var(--ink); }
.xt.hitgrid a.hit.l { color: var(--ink); }
.xt.hitgrid a.h4.l { color: var(--paper); }
.hitgrid a.h4.l::after { border-left-color: var(--paper); }
.hit-key { display: flex; align-items: center; gap: 4px; font-size: 12.5px; color: var(--ink-2); margin-top: 8px; font-variant-numeric: lining-nums; }
.hit-key i { width: 16px; height: 12px; display: inline-block; border: 1px solid var(--rule); }
.xt { display: grid; grid-template-columns: repeat(10, 1fr); border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); margin-top: 14px; }
.xt a { aspect-ratio: 1; display: flex; align-items: center; justify-content: center; text-decoration: none; border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); font: 400 17px/1 var(--serif); font-variant-numeric: lining-nums; position: relative; transition: background-color var(--dur-fast); }
.xt a:nth-child(10n) { border-right-color: var(--ink); }
.xt a:nth-last-child(-n+10) { border-bottom-color: var(--ink); }
.xt a.l { color: var(--ink-3); }
.xt a.l::after { content: ""; position: absolute; inset: 0; background: repeating-linear-gradient(-45deg, var(--hatch) 0 1px, transparent 1px 5px); opacity: .35; }
.xt a .bl { position: absolute; top: 3px; right: 4px; width: 5px; height: 5px; border-radius: 50%; background: var(--red); }
.xt a.cur { background: var(--red-wash); }
@media (hover: hover) { .xt a:hover { background: var(--paper-3); } }
.xt-key { display: flex; flex-wrap: wrap; gap: 6px 16px; font-size: 13.5px; color: var(--ink-2); margin-top: 10px; }
.xt-key i { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: var(--red); margin-right: 6px; vertical-align: 1px; }

.glist { list-style: none; padding: 0; margin: 0; }
.glist li a { display: grid; grid-template-columns: 2.6em 1fr auto; gap: 0 10px; padding: 11px 0; border-bottom: 1px solid var(--rule-2); text-decoration: none; align-items: baseline; }
.glist .gn { font: italic 400 15px var(--serif); color: var(--ink-3); font-variant-numeric: lining-nums tabular-nums; }
.glist .go { font-size: 17px; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.glist .go small { color: var(--ink-3); font-size: 14px; margin-left: 4px; font-variant-numeric: lining-nums; }
.glist .gr { font-variant-numeric: lining-nums tabular-nums; font-size: 17px; text-align: right; }
.glist .gd { grid-column: 2 / 4; font-size: 13.5px; color: var(--ink-2); margin-top: 2px; font-variant-numeric: lining-nums; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.glist .gr.l { color: var(--ink-3); }
@media (hover: hover) { .glist li a:hover .go { text-decoration: underline; text-decoration-color: var(--red); text-underline-offset: 3px; } }

/* ---------- Game viewer ---------- */
.gv-board { max-width: 520px; }
.ctrl { display: grid; grid-template-columns: repeat(5, 1fr); gap: 0; margin-top: 12px; border: 1px solid var(--ink); }
.ctrl button { appearance: none; background: none; border: 0; height: 48px; font: 400 20px/1 var(--serif); cursor: pointer; color: var(--ink); transition: transform var(--dur-fast) var(--ease-out), background-color var(--dur-fast); }
.ctrl button + button { border-left: 1px solid var(--rule); }
.ctrl button:active { transform: scale(.97); background: var(--paper-2); }
.ctrl button.on { color: var(--red); }
.score { font-size: 17px; line-height: 1.9; margin-top: 14px; }
.score .mv { appearance: none; border: 0; background: none; padding: 2px 3px; margin: 0 -1px; font: inherit; cursor: pointer; color: inherit; border-radius: 0; font-variant-numeric: lining-nums; white-space: nowrap; }
.score .mv.op { color: var(--ink-2); }
.score .mv.cur { background: var(--ink); color: var(--paper); }
.score .mv.cur .gl { color: var(--paper); }
.score .mv.cur .fg { background: var(--paper); }
.score .mn { color: var(--ink-3); font-variant-numeric: lining-nums; margin-left: .35em; }
.score .var { color: var(--ink-2); font-size: 15px; }
.score .var .san { color: var(--ink); }
.score .brk { color: var(--ink-3); }
.gv-head .players { font-size: 21px; line-height: 1.3; margin-top: 8px; }
.gv-head .players .me { font-weight: 600; }
.gv-head .players .rt { color: var(--ink-3); font-size: 16px; font-variant-numeric: lining-nums; }

@media (max-width: 999px) {
  .gv .row > .v, .gv .row > .r { display: contents; }
  .gv-sticky { position: sticky; top: var(--head-h); z-index: 10; background: var(--paper); padding: 6px 0 4px; border-bottom: 1px solid var(--rule); margin: 0 calc(var(--gutter) * -1); padding-left: var(--gutter); padding-right: var(--gutter); }
  .gv-sticky .gv-board .dia { max-width: min(100%, 35svh); margin: 0 auto; }
  .gv-sticky .ctrl { margin-top: 8px; }
  .gv-sticky .ctrl button { height: 44px; }
  .gv-sticky .dia-line { margin-top: 4px !important; min-height: 1.4em; font-size: 14px; }
  .gv-curve { margin-top: 4px; }
  .gv-right .h2 { margin-top: 28px !important; }
}
/* ---------- Exercises ---------- */
.desk-only { display: none; }
table.bk td.r { white-space: nowrap; }
.ex-btns { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 6px; max-width: 420px; }
.score .pair { white-space: nowrap; }
.ruler-k { flex-wrap: wrap; gap: 2px 12px; }
@media (max-width: 999px) {
  .ts .row { display: flex; flex-direction: column; }
  .ts .row > .v, .ts .row > .r { display: contents; }
  .ts-a { order: 1; } .galley { order: 2; margin-top: 26px; } .ts-c { order: 3; } .ts-b { order: 4; } .ts-ctrl { order: 5; position: sticky; bottom: 0; } .ts-d { order: 6; }
  .galley [data-galley-board] { max-width: 300px !important; }
}
.ex-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.ex-no { font: italic 400 34px/1 var(--serif); font-variant-numeric: lining-nums; }
.ex-board { position: relative; }
.ex-msg { min-height: 3.2em; margin-top: 14px; font-size: 18px; line-height: 1.4; }
.ex-msg.ok { color: var(--ink); }
.ex-msg.no { color: var(--red); }
.ex-msg .mk { font-weight: 650; margin-right: .3em; }
.dots { display: flex; flex-wrap: wrap; gap: 4px; margin-top: 10px; }
.dots.grid { display: grid; grid-template-columns: repeat(var(--cols, 5), 44px); gap: 4px; }
.dots.grid a { width: 44px; height: 36px; font-size: 13px; }
.dots a { width: 24px; height: 28px; display: flex; align-items: center; justify-content: center; text-decoration: none; font: 400 12px/1 var(--serif); font-variant-numeric: lining-nums tabular-nums; color: var(--ink-3); border: 1px solid var(--rule); position: relative; }
.dots a.solved { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.dots a.revealed { background: repeating-linear-gradient(-45deg, var(--hatch) 0 1px, transparent 1px 4px); color: var(--ink); border-color: var(--ink-2); }
.dots a.cur { outline: 2px solid var(--red); outline-offset: 1px; color: var(--ink); }
.back-sol { margin-top: 28px; border-top: 1px solid var(--ink); padding-top: 12px; perspective: 900px; }
.back-sol .bs-lab { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.sol { margin-top: 12px; padding: 14px 0; transform-origin: 50% 50%; transform: rotate(180deg); transition: transform 600ms var(--ease-io), opacity 200ms; color: var(--ink-2); font-size: 16px; line-height: 1.5; user-select: none; }
/* the page turns: the hold already gave the anticipation, so the turn starts briskly and settles slowly */
html.mo .sol { transition: transform 760ms cubic-bezier(.2, .8, .2, 1), opacity 200ms; }
.sol.up { transform: rotate(0deg); color: var(--ink); user-select: auto; }
.sol .sl { font-size: 19px; }
.holdbtn { position: relative; overflow: hidden; }
.holdbtn .fill { position: absolute; inset: 0; background: var(--ink); transform: scaleX(0); transform-origin: left; opacity: .12; pointer-events: none; }
.holdbtn.holding .fill { transform: scaleX(1); transition: transform 650ms linear; }
html.mo .holdbtn .fill { transition: transform 220ms var(--ease-out); }
html.mo .holdbtn.holding .fill { transition: transform 650ms linear; }
.done-card { margin-top: 28px; padding: 22px 0; border-top: 3px double var(--ink); border-bottom: 3px double var(--ink); text-align: center; }
.done-card .h2 em { color: var(--red); }

/* ---------- Typesetting ---------- */
.ts-lead { font: 400 36px/1.08 var(--serif); letter-spacing: -.015em; margin-top: 6px; min-height: 1.1em; }
.ts-say { font: italic 400 20px/1.4 var(--serif); color: var(--ink-2); margin-top: 14px; min-height: 2.8em; }
.w { display: inline; opacity: 0; filter: blur(4px); transition: opacity .38s ease-out, filter .38s ease-out; }
.w.in { opacity: 1; filter: none; }
.ts-count { display: flex; gap: 22px; align-items: flex-end; margin-top: 22px; flex-wrap: wrap; }
.ts-count b { display: block; font: 400 44px/1 var(--serif); font-variant-numeric: lining-nums tabular-nums; letter-spacing: -.02em; }
.ts-count b small { font-size: 22px; color: var(--ink-3); }
.ts-count span { font-size: 13.5px; color: var(--ink-2); display: block; margin-top: 4px; }
.ruler { display: flex; align-items: flex-end; height: 34px; gap: 1px; margin-top: 16px; border-bottom: 1px solid var(--ink); }
.ruler i { flex: 1; background: var(--ink); height: 2px; opacity: .14; transform-origin: bottom; transition: opacity .25s; }
.ruler i.on { opacity: 1; }
.ruler i.bl { background: var(--red); }
.ruler-k { display: flex; justify-content: space-between; font-size: 12px; color: var(--ink-3); margin-top: 4px; font-variant-numeric: lining-nums; }
.stages { list-style: none; padding: 0; margin: 22px 0 0; border-top: 1px solid var(--rule); }
.stages li { display: grid; grid-template-columns: 18px 1fr auto; gap: 10px; padding: 9px 0; border-bottom: 1px solid var(--rule-2); font-size: 15.5px; color: var(--ink-3); align-items: baseline; }
.stages li .mk { font-size: 13px; text-align: center; }
.stages li.run { color: var(--ink); }
.stages li.run .mk { color: var(--red); }
.stages li.done { color: var(--ink-2); }
.stages li .ct { font-variant-numeric: lining-nums tabular-nums; font-size: 14px; }
.ts-ctrl { position: sticky; bottom: 0; margin-top: 24px; display: flex; gap: 8px; flex-wrap: wrap; align-items: center; background: var(--paper); padding: 10px 0; border-top: 1px solid var(--rule); z-index: 5; }
.seg { display: inline-flex; border: 1px solid var(--ink); }
.seg button { appearance: none; border: 0; background: none; min-height: 44px; min-width: 44px; padding: 0 10px; font: 500 13.5px var(--sans); cursor: pointer; color: var(--ink-2); font-variant-numeric: tabular-nums; }
.seg button + button { border-left: 1px solid var(--rule); }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
.ts-toc .tl { animation: none; }
.ts-toc .new { animation: inkIn 420ms var(--ease-out) both; }
@keyframes inkIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
.ts-toc .ld { transform: scaleX(0); transition: transform 700ms var(--ease-out); }
.ts-toc .set .ld { transform: scaleX(1); }
.demo-tag { display: inline-block; font: 600 11px/1 var(--sans); letter-spacing: .08em; text-transform: uppercase; color: var(--red); border: 1px solid var(--red); padding: 4px 6px 3px; vertical-align: 2px; }
.galley { position: relative; }
.galley .stamp { position: absolute; top: -10px; right: -4px; transform: rotate(4deg); z-index: 3; background: var(--paper); }

/* ---------- Cover ---------- */
.cover { max-width: 620px; margin: 0 auto; padding: 18px var(--gutter) 40px; }
.cover .wm-big { font: italic 300 80px/0.9 var(--serif); letter-spacing: -.035em; margin-top: 22px; }
.cover .rule2 { border: 0; border-top: 3px double var(--ink); margin: 22px 0; }
.madlib { font: 400 25px/1.55 var(--serif); letter-spacing: -.008em; }
.madlib .fld { display: inline-block; position: relative; }
.madlib input[type="text"], .madlib select {
  appearance: none; -webkit-appearance: none; border: 0; border-bottom: 1.5px solid var(--ink); background: transparent; border-radius: 0;
  font: italic 400 25px/1.3 var(--serif); padding: 0 2px 1px; color: var(--ink); min-height: 44px;
}
.madlib input[type="text"] { width: 7.2em; }
.madlib input[type="text"]:focus, .madlib select:focus { outline: none; border-bottom-color: var(--red); }
/* custom number picker (cover) */
.pick-b { appearance: none; border: 0; border-bottom: 1.5px solid var(--ink); background: transparent; border-radius: 0; font: italic 400 25px/1.3 var(--serif); color: var(--ink); padding: 0 2px 1px; min-height: 44px; display: inline-flex; align-items: center; gap: 9px; cursor: pointer; font-variant-numeric: lining-nums; }
.pick-b svg { width: 10px; height: 6px; fill: none; stroke: var(--ink-2); stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; transition: transform var(--dur-slow) var(--ease-out); }
.pick-b[aria-expanded="true"] svg { transform: rotate(180deg); }
.pick-b:focus-visible, .pick-b[aria-expanded="true"] { outline: none; border-bottom-color: var(--red); }
.pick-l { position: absolute; left: -12px; top: calc(100% + 6px); z-index: 20; margin: 0; padding: 6px 0; list-style: none; min-width: calc(100% + 24px); background: var(--paper); border: 1px solid var(--ink); box-shadow: 0 22px 36px -22px oklch(0 0 0 / .32); transform-origin: 30% 0;
  opacity: 0; visibility: hidden; transform: translateY(-4px) scale(.98); filter: blur(2px); pointer-events: none;
  transition: opacity 140ms ease-in, transform 140ms ease-in, filter 140ms ease-in, visibility 0s 140ms; }
.pick.open .pick-l { opacity: 1; visibility: visible; transform: none; filter: none; pointer-events: auto; transition: opacity 220ms var(--ease-out), transform 280ms var(--ease-out), filter 220ms var(--ease-out); }
.pick-l:focus { outline: none; }
.pick-l li { font: italic 400 23px/1 var(--serif); font-variant-numeric: lining-nums tabular-nums; min-height: 46px; padding: 0 26px 0 14px; display: flex; align-items: center; cursor: pointer; color: var(--ink-2); transition: background-color var(--dur-fast); }
.pick-l li .ring { padding: 4px 6px; }
.pick-l li[aria-selected="true"] { color: var(--ink); }
.pick-l li.act { background: var(--paper-2); }
.pick-l:focus-visible li.act { box-shadow: inset 2px 0 0 var(--red); }
html:not(.mo) .pick-l, html:not(.mo) .pick-b svg { transition: none !important; }
.cover-tools { display: none; }
.madlib select { padding-right: 18px; background-image: linear-gradient(45deg, transparent 50%, var(--ink-2) 50%), linear-gradient(135deg, var(--ink-2) 50%, transparent 50%); background-position: right 4px top 55%, right 0 top 55%; background-size: 4px 4px; background-repeat: no-repeat; font-variant-numeric: lining-nums; }
.madlib .paren button { font-size: 23px; padding: 6px 3px; }
.tcs { display: flex; flex-wrap: wrap; gap: 4px 14px; margin-top: 4px; }
.tcs label { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; cursor: pointer; font-size: 18px; font-style: italic; color: var(--ink-2); }
.tcs input { appearance: none; -webkit-appearance: none; width: 18px; height: 18px; border: 1px solid var(--ink); margin: 0; position: relative; cursor: pointer; }
.tcs input:checked { background: var(--ink); }
.tcs input:checked::after { content: ""; position: absolute; left: 5px; top: 1px; width: 5px; height: 10px; border: solid var(--paper); border-width: 0 2px 2px 0; transform: rotate(45deg); }
.tcs label:has(input:checked) { color: var(--ink); }
.pgn-area { width: 100%; min-height: 128px; margin-top: 10px; border: 1px solid var(--ink); background: var(--paper); padding: 12px; font: 13.5px/1.45 var(--mono); border-radius: 0; resize: vertical; }
.cover .assure { font-size: 15px; color: var(--ink-2); margin-top: 14px; }
.cover .assure + .assure { margin-top: 6px; }
.formerr { margin-top: 18px; border-left: 2px solid var(--red); padding: 4px 0 4px 14px; }
.formerr .et { font-size: 19px; color: var(--red); }
.formerr p { font-size: 15.5px; color: var(--ink-2); margin-top: 4px; }
.cover-toc { list-style: none; padding: 0; margin: 10px 0 0; }
.cover-toc li { font-size: 16px; color: var(--ink-2); padding: 4px 0 4px 1.4em; position: relative; }
.cover-toc li::before { content: "§"; position: absolute; left: 0; color: var(--ink-3); }
.ed-sheet { border: 1px solid var(--ink); padding: 18px; margin-top: 18px; position: relative; }
.ed-sheet + .ed-sheet { margin-top: 12px; }
.ed-sheet.old { border-style: dashed; border-color: var(--rule); color: var(--ink-2); }

/* ---------- Settings ---------- */
.set-group { padding: 18px 0; border-top: 1px solid var(--rule); }
.set-group > .lab { font-variant-caps: all-small-caps; letter-spacing: .06em; font-weight: 600; font-size: 15px; margin-bottom: 8px; }
.opts { display: flex; flex-wrap: wrap; gap: 8px; }
.opt { appearance: none; border: 1px solid var(--rule); background: transparent; min-height: 44px; padding: 0 14px; font: 500 14px var(--sans); cursor: pointer; display: inline-flex; align-items: center; gap: 10px; color: var(--ink-2); border-radius: 0; position: relative; }
.opt[aria-pressed="true"] { border-color: var(--ink); color: var(--ink); }
.opt[aria-pressed="true"]::after { content: ""; position: absolute; left: -1px; right: -1px; bottom: -1px; height: 3px; background: var(--red); }
.opt img { width: 30px; height: 30px; }
.opt .sw { width: 30px; height: 30px; display: grid; grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; box-shadow: 0 0 0 1px var(--ink); }

/* ---------- Errata ---------- */
.state { border: 1px solid var(--rule); padding: 16px; margin-top: 14px; }
.state > .lab { font-variant-caps: all-small-caps; letter-spacing: .06em; font-weight: 600; color: var(--ink-3); font-size: 14px; margin-bottom: 8px; }
.skel { background: var(--paper-3); height: 14px; margin-top: 8px; }
.skel.h { height: 26px; width: 70%; }
.skel.b { aspect-ratio: 1; height: auto; width: 46%; }

/* ---------- Forest plot ---------- */
.forest text { fill: var(--ink-2); font-size: 12px; font-variant-numeric: lining-nums tabular-nums; }

/* ---------- Footer: checkered band, colophon, ex libris ---------- */
.foot { margin-top: 40px; padding: 0 var(--gutter) 28px; }
.checker { height: 14px; display: grid; grid-template-columns: repeat(32, 1fr); border-top: 1px solid var(--ink); border-bottom: 1px solid var(--ink); }
.checker i:nth-child(odd) { background: repeating-linear-gradient(-45deg, var(--hatch) 0 1px, transparent 1px 4px); }
.colo { margin-top: 26px; display: grid; gap: 28px; }
.colo h3 { font-variant-caps: all-small-caps; letter-spacing: .07em; font-weight: 600; font-size: 15px; }
.colo p { font-size: 15px; color: var(--ink-2); margin-top: 8px; line-height: 1.5; }
.spec { margin: 10px 0 0; display: grid; grid-template-columns: auto 1fr; gap: 4px 14px; font-size: 14px; }
.spec dt { color: var(--ink-3); font-style: italic; }
.spec dd { margin: 0; color: var(--ink); font-variant-numeric: lining-nums; }
.exlibris { cursor: pointer; text-align: center; -webkit-tap-highlight-color: transparent; }
.exlibris pre { display: inline-block; text-align: left; margin: 0 auto; font: 400 11.2px/1.32 var(--mono); color: var(--ink); letter-spacing: 0; white-space: pre; }
.exlibris pre .r { color: var(--red); }
.exlibris pre .d { color: var(--ink-3); }
.exlibris .cap { font-size: 13.5px; color: var(--ink-2); margin: 10px auto 0; max-width: 34em; font-style: italic; }
.foot-end { display: flex; justify-content: space-between; align-items: center; gap: 12px; margin-top: 26px; padding-top: 12px; border-top: 1px solid var(--rule); font-size: 13.5px; color: var(--ink-3); }
.foot-end a { min-height: 44px; display: inline-flex; align-items: center; color: var(--ink-2); }

/* ---------- Toast ---------- */
.toast { position: fixed; left: 50%; bottom: calc(var(--dock-h) + 16px + env(safe-area-inset-bottom)); transform: translate(-50%, 12px); opacity: 0; background: var(--ink); color: var(--paper); font: 500 14px var(--sans); padding: 12px 16px; z-index: 60; pointer-events: none; transition: opacity 160ms, transform 240ms var(--ease-out); }
.toast.in { opacity: 1; transform: translate(-50%, 0); }

/* ---------- Page transitions ---------- */
/* without View Transitions: the new page fades in (its parts rise on their own, see Motion below) */
main.fade { animation: pageIn 260ms var(--ease-out) both; }
@keyframes pageIn { from { opacity: 0; } to { opacity: 1; } }
/* route change: the old page fades to paper fast, the new page fades in slower; dock and ribbon stay put
   and their indicators slide (they are live, not snapshots) */
html.mo .dock { view-transition-name: dock; }
html.mo .ribbon { view-transition-name: ribbon; }
::view-transition { background: var(--paper); }
::view-transition-old(root) { animation: vtOut var(--dur-out) cubic-bezier(.4, 0, 1, 1) both; mix-blend-mode: normal; }
::view-transition-new(root) { animation: vtIn 340ms var(--ease-out) 60ms both; mix-blend-mode: normal; }
::view-transition-group(dock), ::view-transition-group(ribbon) { animation: none; }
::view-transition-old(dock), ::view-transition-old(ribbon) { animation: none; opacity: 0; }
::view-transition-new(dock), ::view-transition-new(ribbon) { animation: none; }
@keyframes vtOut { to { opacity: 0; } }
@keyframes vtIn { from { opacity: 0; } }
/* paper ↔ night, language, settings: the whole screen crossfades as one image */
html.vt-fade .dock, html.vt-fade .ribbon { view-transition-name: none; }
html.vt-fade::view-transition-old(root) { animation: none; }
html.vt-fade::view-transition-new(root) { animation: vtIn 440ms var(--ease-out) both; }
::view-transition-group(dia) { animation-duration: 460ms; animation-timing-function: cubic-bezier(.32,.72,0,1); }
@media (prefers-reduced-motion: reduce) {
  main.fade { animation: none; }
  .w { transition: none; opacity: 1; filter: none; }
  .ring.draw > svg path, .paren > button.draw > svg path { animation: none; stroke-dashoffset: 0; }
  .sol { transition: opacity 200ms; }
  .ts-toc .new { animation: none; }
  ::view-transition-group(*), ::view-transition-old(*), ::view-transition-new(*) { animation: none !important; }
}
html.rm main.fade { animation: none; } html.rm .w { transition: none; opacity: 1; filter: none; }
html.rm .ring.draw > svg path, .paren > button.draw > svg path { animation: none; stroke-dashoffset: 0; } html.rm .sol { transition: opacity 200ms; } html.rm .ts-toc .new { animation: none; }

/* =================== Desktop: the two-page spread =================== */
@media (min-width: 1000px) {
  :root { --gutter: 48px; }
  body { padding-bottom: 0; font-size: 18px; }
  .dock, .runhead { display: none; }
  .ribbon {
    display: flex; flex-direction: column; position: fixed; left: 0; top: 0; bottom: 0; width: 256px; z-index: 30;
    padding: 30px 26px 22px 30px; border-right: 1px solid var(--rule); background: var(--paper); overflow-y: auto;
  }
  .ribbon .wm { font: italic 400 34px/1 var(--serif); text-decoration: none; letter-spacing: -.02em; }
  .ribbon .by { font-size: 14px; color: var(--ink-2); margin-top: 6px; line-height: 1.35; }
  .ribbon nav { margin-top: 26px; position: relative; }
  .ribbon nav ol { list-style: none; padding: 0; margin: 0; position: relative; }
  .ribbon nav ol::before { content: ""; position: absolute; left: 4px; top: 14px; bottom: 14px; border-left: 1px dashed var(--rule); }
  .ribbon nav .fillline { position: absolute; left: 4px; top: 14px; width: 1px; background: var(--ink); transform-origin: top; transition: transform 300ms var(--ease-out); }
  html.mo .ribbon nav .fillline { transition: transform 620ms var(--ease-out); }
  html:not(.mo) .ribbon nav .fillline { transition: none; }
  .ribbon nav a { display: grid; grid-template-columns: 22px 1fr; align-items: baseline; text-decoration: none; padding: 5px 0; font-size: 15.5px; color: var(--ink-2); line-height: 1.3; position: relative; }
  .ribbon nav a .bul { width: 9px; height: 9px; border: 1px solid var(--ink-3); background: var(--paper); align-self: center; transform: rotate(45deg); position: relative; z-index: 1; }
  .ribbon nav a.past .bul { background: var(--ink); border-color: var(--ink); }
  .ribbon nav a[aria-current="page"] { color: var(--ink); }
  .ribbon nav a[aria-current="page"] .bul { background: var(--red); border-color: var(--red); }
  .ribbon nav a .rn { font-variant-numeric: lining-nums; font-style: italic; color: var(--ink-3); margin-right: 6px; }
  .ribbon nav a.gap { margin-top: 10px; }
  .ribbon nav a:hover { color: var(--ink); }
  .ribbon .rb-foot { margin-top: auto; padding-top: 20px; display: flex; align-items: center; justify-content: space-between; border-top: 1px solid var(--rule); }
  .ribbon .rb-foot a { font: 500 13px var(--sans); color: var(--ink-2); text-decoration: none; min-height: 44px; display: inline-flex; align-items: center; }
  .ribbon .rb-foot .lang button { min-width: 36px; }
  body.no-ribbon .ribbon { display: none; }
  .desk-only { display: block; }
  .shell { margin-left: 256px; }
  body.no-ribbon .shell { margin-left: 0; }
  .desk-head { display: grid; grid-template-columns: 1fr 1fr; gap: 0 64px; max-width: 1180px; margin: 0 auto; padding: 22px var(--gutter) 0; font-variant-caps: all-small-caps; letter-spacing: .07em; font-size: 14.5px; color: var(--ink-2); font-variant-numeric: lining-nums; }
  .desk-head > div { border-bottom: 1px solid var(--rule); padding-bottom: 8px; }
  .desk-head > div:last-child { text-align: right; }
  .desk-head .red { color: var(--red); }
  .page { max-width: 760px; padding: 28px var(--gutter) 80px; }
  .spread { max-width: 1180px; margin: 0 auto; padding: 30px var(--gutter) 80px; position: relative; }
  .spread::before { content: ""; position: absolute; top: 30px; bottom: 80px; left: 50%; border-left: 1px solid var(--rule-2); }
  .row { display: grid; grid-template-columns: 1fr 1fr; gap: 0 64px; align-items: start; }
  .row + .row { margin-top: 64px; }
  .row > .v { min-width: 0; }
  .row > .r { margin-top: 0; position: sticky; top: 28px; min-width: 0; }
  .row > .r.nostick { position: static; }
  .row .dia:not(.small) { max-width: min(100%, calc(100vh - 300px)); }
  .ex-board .dia { max-width: min(100%, calc(100vh - 400px)); }
  .gv-board .dia { max-width: min(100%, calc(100vh - 330px)); }
  .row.full { display: block; position: relative; z-index: 1; background: var(--paper); }
  .title { font-size: 52px; }
  .chno { font-size: 84px; }
  .verdict { font-size: 38px; }
  .ts-lead { font-size: 46px; }
  .lede { font-size: 20px; }
  .prose, .claim { font-size: 18.5px; }
  .evi { gap: 52px; }
  .strip { grid-template-columns: repeat(4, 1fr); }
  .cover { max-width: 1180px; display: grid; grid-template-columns: 1.1fr .9fr; gap: 0 72px; padding: 56px var(--gutter) 60px; position: relative; }
  .cover .wm-big { font-size: 128px; margin-top: 30px; }
  .madlib { font-size: 32px; }
  .madlib input[type="text"], .madlib select, .pick-b { font-size: 32px; }
  .pick-l li { font-size: 28px; min-height: 52px; }
  .cover-tools { display: flex; align-items: center; gap: 2px; position: absolute; top: 14px; right: calc(var(--gutter) - 10px); z-index: 5; }
  .madlib .paren button { font-size: 29px; }
  .foot { max-width: 1180px; margin: 64px auto 0; padding: 0 var(--gutter) 30px; }
  .colo { grid-template-columns: 1fr 1fr 1.25fr; gap: 48px; align-items: start; }
  .exlibris pre { font-size: 12.5px; }
  .toast { bottom: 24px; }
  .ts-ctrl { position: static; }
  .figs b { font-size: 34px; }
}
@media (min-width: 1000px) and (max-width: 1240px) { .row { gap: 0 44px; } .desk-head { gap: 0 44px; } }

/* =================== D · Criba × Folio: the sieve, printed =================== */
/* the 10×10 grid of win % curves, one square per game (Criba), set like a crosstable (Folio) */
.grid-wrap { width: 100%; }
.grid-wrap.small { max-width: 340px; }
.grid-wrap.big { max-width: 560px; }
.grid10 { display: grid; grid-template-columns: repeat(10, 1fr); border-top: 1px solid var(--ink); border-left: 1px solid var(--ink); }
.cell { position: relative; display: block; aspect-ratio: 1; background: var(--paper); border-right: 1px solid var(--rule); border-bottom: 1px solid var(--rule); overflow: hidden; transition: opacity var(--dur-mod) var(--ease-out), background-color var(--dur-slow); }
.cell:nth-child(10n) { border-right-color: var(--ink); }
.cell:nth-last-child(-n+10) { border-bottom-color: var(--ink); }
.cell svg { position: absolute; inset: 0; width: 100%; height: 100%; }
.cell path { fill: none; stroke: var(--ink); stroke-width: 1.15; vector-effect: non-scaling-stroke; opacity: 0; }
.cell .mid { stroke: var(--rule); stroke-width: 1; stroke-dasharray: 1 2; vector-effect: non-scaling-stroke; opacity: 0; }
.cell.s-d path { opacity: .92; } .cell.s-d .mid { opacity: 1; }
.cell.s-d.r-draw { background: var(--paper-3); }
.cell.s-d.r-loss::before { content: ""; position: absolute; inset: 0; background: repeating-linear-gradient(-45deg, var(--hatch) 0 1px, transparent 1px 5px); opacity: .32; }
.cell.s-a { background: var(--red-wash); }
.cell.s-a path { stroke: var(--red); opacity: 1; stroke-width: 1.4; stroke-dasharray: 1; stroke-dashoffset: 1; animation: cellDraw var(--cell-ms, 1200ms) linear forwards; }
.cell.s-a::after { content: ""; position: absolute; inset: 1px; box-shadow: inset 0 0 0 1.5px var(--red); }
@keyframes cellDraw { to { stroke-dashoffset: 0; } }
.cell.failed::after { content: ""; position: absolute; inset: 3px; border: 1px dashed var(--red); }
.cell.dim { opacity: .2; }
a.cell:hover { outline: 2px solid var(--red); outline-offset: -1px; z-index: 1; }
.pips { position: absolute; left: 2px; bottom: 2px; display: flex; gap: 2px; transition: opacity var(--dur-slow); }
.pip { display: inline-block; width: 4px; height: 4px; flex: none; }
.pip-s { background: var(--red); } .pip-h { box-shadow: inset 0 0 0 1px var(--red); background: var(--paper); }
.grid-wrap.nomaia .pips, .grid-wrap.pips-off .pips { opacity: 0; }
.sift .grid-wrap:not(.pips-off) .cell:not(.mx) .pips { opacity: 0; }
.g-key { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: 13px; color: var(--ink-2); margin-top: 10px; align-items: center; }
.g-key span { display: inline-flex; align-items: center; gap: 6px; }
.g-key .lg { width: 12px; height: 12px; display: inline-block; border: 1px solid var(--ink); background: var(--paper); position: relative; }
.g-key .lg.r-draw { background: var(--paper-3); }
.g-key .lg.r-loss { background: repeating-linear-gradient(-45deg, var(--hatch) 0 1px, transparent 1px 3px); }
.g-key .pip { width: 6px; height: 6px; }
.dim-why { color: var(--ink-3); }

/* the sieve figure (contents) */
.sv-rows { list-style: none; padding: 0; margin: 12px 0 0; border-top: 1px solid var(--ink); }
.sv-rows a { display: grid; grid-template-columns: 3.2em 8.6em 1fr; column-gap: 12px; align-items: baseline; padding: 5px 0 6px; border-bottom: 1px solid var(--rule-2); text-decoration: none; color: inherit; }
.sv-rows .v { font: 400 20px/1.1 var(--serif); text-align: right; font-variant-numeric: lining-nums tabular-nums; letter-spacing: -.01em; }
.sv-rows .l { font-size: 14.5px; color: var(--ink-2); white-space: nowrap; }
.sv-rows .bar { height: 5px; align-self: center; }
.sv-rows li:first-child .bar { visibility: hidden; }
.sv-rows .bar i { display: block; height: 100%; background: var(--ink); opacity: .78; }
.sv-rows .fin .v { color: var(--red); } .sv-rows .fin .bar i { background: var(--red); opacity: 1; } .sv-rows .fin .l { color: var(--ink); }
@media (hover: hover) { .sv-rows:has(a:hover) a:not(:hover) { opacity: .5; } .sv-rows a { transition: opacity .2s; } .sv-rows a:hover { transition-duration: 0s; } }

/* "(?)": the long explanation lives behind a tap */
details.why { display: inline; }
details.why summary { display: inline; cursor: pointer; list-style: none; color: var(--ink-3); font-style: normal; font-size: .92em; padding: 6px 2px; }
details.why summary::-webkit-details-marker { display: none; }
details.why summary:hover { color: var(--red); }
details.why[open] summary { color: var(--red); }
details.why .why-b { display: block; margin: 6px 0 4px; padding-left: 10px; border-left: 2px solid var(--red); font: normal 400 14.5px/1.5 var(--serif); color: var(--ink-2); max-width: 46em; }
.scrubhint { color: var(--ink-3); font-size: 13px; }
.fig figcaption { font-style: italic; }
.fig figcaption .san { font-style: normal; }

/* theme toggle */
.themebtn { appearance: none; border: 0; background: none; width: 44px; height: 44px; display: inline-grid; place-items: center; cursor: pointer; color: var(--ink-2); flex: none; }
.themebtn svg { width: 18px; height: 18px; }
.themebtn circle { fill: none; stroke: currentColor; stroke-width: 1.4; }
.themebtn path { fill: currentColor; }
.themebtn:hover { color: var(--ink); }

/* cover: the empty sieve */
.defn { font: italic 400 22px/1.4 var(--serif); color: var(--ink-2); margin-top: 30px; }
.defn b { font-weight: 600; color: var(--ink); }
.cover-grid { max-width: 360px; margin-top: 20px; }
.cover-grid figcaption { font-size: 14px; color: var(--ink-2); margin-top: 8px; }

/* games index preview */
.gprev .dia { max-width: 260px; }

/* the wait: Criba's sift, printed, with Folio's galley proof in the corner */
.sift { max-width: 1240px; margin: 0 auto; padding: 4px var(--gutter) 0; display: flex; flex-direction: column; }
.sift > .col { display: contents; }
.w-a { order: 1; } .w-k { order: 2; } .w-b { order: 3; margin-top: 16px; } .w-g { order: 4; } .w-f { order: 5; } .w-d { order: 6; } .sift > .ts-ctrl { order: 7; }
.sift .ts-lead { font-size: 31px; min-height: 0; }
.sift .ts-lead em { font-style: italic; color: var(--red); }
.sift .sub { margin-top: 6px; font-size: 14.5px; color: var(--ink-2); }
.sift .sub b { font-weight: 400; color: var(--ink); }
.sift .stages { margin-top: 18px; }
.sift .leave { margin-top: 12px; }
.counters { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 18px; border-top: 1px solid var(--ink); }
.ctr { padding: 8px 8px 9px 0; border-bottom: 1px solid var(--rule-2); min-width: 0; }
.ctr:not(:nth-child(3n + 1)) { padding-left: 10px; border-left: 1px solid var(--rule-2); }
.ctr b { display: block; font: 400 25px/1.05 var(--serif); font-variant-numeric: lining-nums tabular-nums; color: var(--ink-3); letter-spacing: -.01em; transition: color var(--dur-slow); }
.ctr.live b { color: var(--ink); }
.ctr.fin b { color: var(--red); }
.ctr span { display: block; font-size: 12.5px; color: var(--ink-2); margin-top: 2px; line-height: 1.25; }
.galley { margin: 20px 0 0; display: grid; grid-template-columns: 136px minmax(0, 1fr); gap: 20px; align-items: start; }
.galley figcaption { font-size: 14.5px; line-height: 1.4; }
.galley .gk { display: block; font-variant-caps: all-small-caps; letter-spacing: .06em; font-weight: 600; color: var(--red); font-size: 14px; }
.galley .gl-board .dia-board { box-shadow: 0 0 0 1px var(--ink), 0 0 0 3px var(--paper), 0 0 0 4px var(--ink); margin: 4px; }
.feed { list-style: none; padding: 0; margin: 16px 0 0; }
.feed li { display: grid; grid-template-columns: 2.2em 1fr; gap: 8px; padding: 6px 0; border-top: 1px solid var(--rule-2); font-size: 14.5px; line-height: 1.35; color: var(--ink-2); }
html.mo .feed li { animation: feedIn 380ms var(--ease-out) both; }
@keyframes feedIn { from { opacity: 0; transform: translateY(-4px); filter: blur(2px); } }
.feed li .gn { font: italic 400 14px var(--serif); color: var(--ink-3); font-variant-numeric: lining-nums tabular-nums; }
.feed li.pat { color: var(--ink); }
.feed li.pat .gn::before { content: "§"; color: var(--red); font-style: normal; }
.feed li b { font-weight: 600; }
.done-cta { margin-top: 16px; display: flex; flex-wrap: wrap; gap: 6px 18px; align-items: center; }
.sift .ts-ctrl { margin-top: 22px; position: sticky; bottom: 0; }
.sift .progressline { position: absolute; left: calc(var(--gutter) * -1); right: calc(var(--gutter) * -1); top: -1px; height: 2px; background: var(--red); transform-origin: 0 50%; transform: scaleX(0); transition: transform 300ms linear; }
html.rm .cell.s-a path { animation: none; stroke-dashoffset: 0; }

/* footer tail: cerno, set in his moves; dissolves into the bottom edge */
.tail { margin-top: 30px; }
.tail-cap { font: italic 400 13px/1.4 var(--serif); color: var(--ink-3); }
.tail-art { display: grid; gap: 14px; margin-top: 10px; padding-bottom: 6px; -webkit-mask-image: linear-gradient(to bottom, #000 18%, rgba(0,0,0,.35) 62%, transparent 100%); mask-image: linear-gradient(to bottom, #000 18%, rgba(0,0,0,.35) 62%, transparent 100%); }
.ascii { font: 400 12px/14px var(--mono); width: max-content; margin: 0; white-space: pre; color: var(--ink-2); user-select: none; cursor: crosshair; touch-action: manipulation; }
.ascii .c { display: inline-block; vertical-align: top; width: 1ch; height: 14px; transition: transform 520ms var(--ease-out), opacity 300ms var(--ease-out); transition-delay: calc(var(--dl, 0ms) * .3); }
.ascii .c.ink { color: var(--ink); }
.ascii .c.m { color: var(--red); font-weight: 500; }
.ascii .c.mesh { color: var(--rule); }
.ascii.sifting .c.ink { transform: translateY(var(--fy, 120px)); opacity: 0; transition: transform 700ms cubic-bezier(.55, 0, .9, .4), opacity 600ms ease-in; transition-delay: var(--dl, 0ms); }
.ascii.phone { font-size: 13px; line-height: 15px; } .ascii.phone .c { height: 15px; }
.ascii-grid { font: 400 12px/1.3 var(--mono); margin: 0; white-space: pre; color: var(--ink-2); }
.ascii-grid .rw { color: var(--ink); font-weight: 500; } .ascii-grid .rl { color: var(--ink-3); } .ascii-grid .rd { color: var(--ink-2); } .ascii-grid .rq { color: var(--ink-3); }
.foot .exlibris { margin-top: 26px; }
.foot .exlibris .cap { font-size: 13px; margin-top: 8px; }
.foot-end { font-size: 12.5px; }
.foot-end span { min-width: 0; }
@media (prefers-reduced-motion: reduce) { .ascii .c { transition: opacity 200ms; } .ascii.sifting .c.ink { transform: none; } }
html.rm .ascii .c { transition: opacity 200ms; } html.rm .ascii.sifting .c.ink { transform: none; }

@media (min-width: 1000px) {
  .sift { display: grid; grid-template-columns: 270px minmax(0, 540px) 290px; gap: 0 48px; justify-content: center; align-items: start; padding-top: 26px; }
  .sift > .col { display: block; }
  .sift > .ts-ctrl { grid-column: 1 / -1; }
  .sift .ts-lead { font-size: 40px; }
  .w-b { margin-top: 0; }
  .sift .w-k { margin-top: 18px; }
  .sift .w-f .feed { margin-top: 14px; }
  .galley { display: block; margin-top: 0; }
  .galley .gl-board { max-width: 200px; }
  .galley figcaption { margin-top: 10px; }
  .counters { grid-template-columns: repeat(2, 1fr); }
  .ctr:not(:nth-child(3n + 1)) { padding-left: 0; border-left: 0; }
  .ctr:nth-child(2n) { padding-left: 12px; border-left: 1px solid var(--rule-2); }
  .tail-art { grid-template-columns: auto 1fr; align-items: start; gap: 40px; }
  .foot .exlibris { margin-top: 34px; }
}
/* wait, phone: the galley board sits in the top-right corner, its caption runs under the title */
@media (max-width: 999.98px) {
  .sift { display: grid; grid-template-columns: minmax(0, 1fr) 104px; column-gap: 16px; grid-template-areas: "a g" "c c" "k k" "b b" "f f" "d d" "e e"; }
  .sift > .col, .sift .galley { display: contents; }
  .sift .w-a { grid-area: a; } .sift .gl-board { grid-area: g; align-self: start; margin-top: 30px; }
  .sift .galley figcaption { grid-area: c; margin-top: 10px; font-size: 14px; min-height: 2.8em; }
  .sift .galley .gk { display: inline; margin-right: 6px; }
  .sift .w-k { grid-area: k; } .sift .w-b { grid-area: b; } .sift .w-f { grid-area: f; } .sift .w-d { grid-area: d; } .sift > .ts-ctrl { grid-area: e; }
  .sift .ts-lead { font-size: 29px; }
  .sift .counters { margin-top: 12px; }
}
/* night: the printed hatch would swallow black pieces, so the board becomes a cool, low-chroma two-tone */
:root[data-theme="dark"][data-board="print"] .cb { background: none; --cb-light: oklch(0.74 0.012 250); --cb-dark: oklch(0.55 0.02 252); }
:root[data-theme="dark"][data-board="print"] .cb-sq.d { background: var(--cb-dark); }
:root[data-theme="dark"] .cb { --cb-hl-last: oklch(0.69 0.165 27 / 0.22); }
:root[data-theme="dark"] .dia-board { box-shadow: 0 0 0 1px var(--ink-3), 0 0 0 3px var(--paper), 0 0 0 4.5px var(--ink-3); }
@media (max-width: 999.98px) { .sift { grid-template-columns: minmax(0, 1fr) 98px; } }

/* =================== Motion =================== */
/* One language, taken from the Maia figure: parts fade up a few pixels out of a soft blur, once, as they come
 * into view (motion.js marks them); rules, leaders and bars draw from the left; the games grid fills row by row.
 * Everything here hangs off html.mo, which only exists when motion is allowed; hidden states exist only for
 * elements JS has marked, so a page without JS, without the observer or with reduced motion is fully visible. */

/* entrance units (data-rv = u: rise · b: rise + blur, for type · x: draw from the left · g: games grid) */
html.mo [data-rv]:is([data-rv="u"], [data-rv="b"]):not(.rv-in) { opacity: 0; transform: translateY(var(--rise)); }
html.mo [data-rv="b"]:not(.rv-in) { filter: blur(var(--blur)); }
html.mo [data-rv="x"]:not(.rv-in) { transform: scaleX(0); }
html.mo [data-rv="x"] { transform-origin: 0 50%; }
html.mo [data-rv].rv-in { transition: opacity var(--dur-in) var(--ease-out) var(--rv-d, 0ms), transform var(--dur-rise) var(--ease-out) var(--rv-d, 0ms), filter 620ms var(--ease-out) var(--rv-d, 0ms); }
html.mo [data-rv="x"].rv-in { transition: transform var(--dur-draw) var(--ease-draw) var(--rv-d, 0ms); }
/* table of contents: the row rises, then its leader dots run out to the number */
html.mo .tl[data-rv]:not(.rv-in) .ld { clip-path: inset(0 100% 0 0); }
html.mo .tl[data-rv].rv-in .ld { transition: clip-path var(--dur-draw) var(--ease-draw) calc(var(--rv-d, 0ms) + 140ms); }
/* sieve figure and Maia split bars: the bar is drawn after its row arrives */
html.mo .sv-rows li[data-rv]:not(.rv-in) .bar i { transform: scaleX(0); }
html.mo .sv-rows .bar i { transform-origin: 0 50%; }
html.mo .sv-rows li[data-rv].rv-in .bar i { transition: transform var(--dur-draw) var(--ease-draw) calc(var(--rv-d, 0ms) + 120ms); }
html.mo .split[data-rv]:not(.rv-in) .bar { clip-path: inset(0 100% 0 0); }
html.mo .split[data-rv].rv-in .bar { transition: clip-path 900ms var(--ease-draw) calc(var(--rv-d, 0ms) + 100ms); }

/* the games grid: cells fade in row by row (a slight wave across each row), the win% curves draw after */
.grid10 > .cell:nth-child(n+11) { --r: 1; } .grid10 > .cell:nth-child(n+21) { --r: 2; } .grid10 > .cell:nth-child(n+31) { --r: 3; }
.grid10 > .cell:nth-child(n+41) { --r: 4; } .grid10 > .cell:nth-child(n+51) { --r: 5; } .grid10 > .cell:nth-child(n+61) { --r: 6; }
.grid10 > .cell:nth-child(n+71) { --r: 7; } .grid10 > .cell:nth-child(n+81) { --r: 8; } .grid10 > .cell:nth-child(n+91) { --r: 9; }
.grid10 > .cell:nth-child(10n+2) { --c: 1; } .grid10 > .cell:nth-child(10n+3) { --c: 2; } .grid10 > .cell:nth-child(10n+4) { --c: 3; }
.grid10 > .cell:nth-child(10n+5) { --c: 4; } .grid10 > .cell:nth-child(10n+6) { --c: 5; } .grid10 > .cell:nth-child(10n+7) { --c: 6; }
.grid10 > .cell:nth-child(10n+8) { --c: 7; } .grid10 > .cell:nth-child(10n+9) { --c: 8; } .grid10 > .cell:nth-child(10n+10) { --c: 9; }
html.mo .grid10[data-rv="g"]:not(.rv-in) { opacity: 0; }
html.mo .grid10[data-rv="g"].rv-in > .cell { --gd: calc(var(--rv-d, 0ms) + var(--r, 0) * 55ms + var(--c, 0) * 9ms); animation: cellIn 520ms var(--ease-out) var(--gd) backwards; }
html.mo .grid10[data-rv="g"].rv-in > .cell.s-d path { stroke-dasharray: 1; animation: lineDraw 900ms var(--ease-draw) calc(var(--gd) + 120ms) backwards; }
@keyframes cellIn { from { opacity: 0; transform: translateY(3px); } }
@keyframes lineDraw { from { stroke-dashoffset: 1; } to { stroke-dashoffset: 0; } }

/* figures that draw once (clock scatter, a game's win% curve and time bars): wipe left to right, marks after */
.fig .wipe-r { clip-path: inset(0 0 0 100%); }
html.mo [data-draw].dr-wait .wipe { clip-path: inset(0 100% 0 0); }
html.mo [data-draw].dr-wait .wipe-r { clip-path: inset(0 0 0 0); }
html.mo [data-draw].dr-wait .late { opacity: 0; filter: blur(3px); }
html.mo [data-draw].dr-in .wipe, html.mo [data-draw].dr-in .wipe-r { transition: clip-path 900ms var(--ease-draw) 80ms; }
html.mo [data-draw].dr-in .late { transition: opacity 420ms var(--ease-out) 760ms, filter 520ms var(--ease-out) 760ms; }

/* content that replaces content: a short fade up out of a blur (galley caption, wait headline, preview) */
html.mo .sw-in { animation: swIn 380ms var(--ease-out) both; }
@keyframes swIn { from { opacity: 0; transform: translateY(4px); filter: blur(3px); } }
html.mo .gprev.sw-in { animation: swFade 200ms var(--ease-out) both; }
@keyframes swFade { from { opacity: .35; } }
html.mo .done-cta:not([hidden]) { animation: swIn 480ms var(--ease-out) both; }
html.mo .formerr { animation: swIn 360ms var(--ease-out) both; }

/* exercise feedback: right settles in, the tick lands; wrong arrives with a small sideways settle, no shake */
html.mo .ex-msg.ok.sw-in .mk { display: inline-block; animation: markIn 460ms var(--ease-out) 60ms both; }
@keyframes markIn { from { opacity: 0; transform: scale(.7); } }
html.mo .ex-msg.no.sw-in { animation: settle 420ms var(--ease-out) both; }
@keyframes settle { from { opacity: 0; transform: translateX(6px); filter: blur(2px); } }

/* dock indicator, segmented controls */
html.mo .dock .dk-ind { transition: transform 460ms var(--ease-out), opacity var(--dur-mod); }
html.mo .seg button { transition: transform var(--dur-mod) var(--ease-out); }

/* presses: everything you tap gives a little (scale .97), released on the same curve */
html.mo :is(.opt, .seg button, .themebtn, .lang button, .dots a, .paren > button, .paren > a, .dia-nav a) { transition: transform var(--dur-mod) var(--ease-out); }
html.mo :is(.opt, .seg button, .themebtn, .lang button, .dots a, .paren > button, .paren > a, .dia-nav a):active { transform: scale(.97); }

/* hover on rows: a soft ink wash fades in (and out faster) */
@media (hover: hover) {
  .glist li a, .pref li:has(> a) { position: relative; isolation: isolate; }
  .glist li a::before, .pref li:has(> a)::before { content: ""; position: absolute; inset: 0 -10px; z-index: -1; pointer-events: none; background: color-mix(in oklch, var(--ink) 4.5%, transparent); opacity: 0; transition: opacity 120ms ease-out; }
  .glist li a:hover::before, .pref li:has(> a):hover::before { opacity: 1; transition-duration: 200ms; }
  html:not(.mo) .glist li a::before, html:not(.mo) .pref li:has(> a)::before { transition: none; }
}

/* skeletons breathe while they wait */
html.mo .skel { animation: breathe 1.6s ease-in-out infinite alternate; }
@keyframes breathe { to { opacity: .55; } }

/* ---------- theme switch (paper ↔ night), after pdepablo.com ----------
 * html.theming lives ~0.5s: all colour properties ease in place. Ink and paper cross at mid-grey, so the
 * page dims and relights instead of showing two overlapping snapshots. Other transitions pause meanwhile. */
html.theming, html.theming *, html.theming *::before, html.theming *::after {
  transition-property: background-color, color, border-color, outline-color, text-decoration-color, fill, stroke, box-shadow, caret-color !important;
  transition-duration: 480ms !important;
  transition-timing-function: cubic-bezier(.45, 0, .25, 1) !important;
  transition-delay: 0s !important;
}

/* ---------- book icons (icons.js): ink mesh + one red pencil mark ---------- */
.ico { width: 18px; height: 18px; flex: none; overflow: visible; display: block; }
.ico .m { fill: none; stroke: currentColor; stroke-width: .7; opacity: .5; }
.ico .r { stroke: var(--red); }
.ico .rf { fill: var(--red); }
.dock a .dk-ic .ico { width: 23px; height: 23px; color: var(--ink-2); }
.dock a[aria-current="page"] .dk-ic .ico { color: var(--ink); }
.chno { display: flex; align-items: center; gap: 16px; }
.chno .chico { width: 46px; height: 46px; color: var(--ink); }
@media (min-width: 1000px) {
  .chno .chico { width: 58px; height: 58px; }
  .ribbon nav a { grid-template-columns: 30px 1fr; }
  .ribbon nav ol::before, .ribbon nav .fillline { left: 9px; }
  .ribbon nav a .bul, .ribbon nav a.past .bul, .ribbon nav a[aria-current="page"] .bul { width: 19px; height: 19px; border: 0; transform: none; background: var(--paper); display: grid; place-items: center; color: var(--ink-3); }
  .ribbon nav a .bul .ico { width: 17px; height: 17px; opacity: .6; transition: opacity var(--dur-mod); }
  .ribbon nav a.past .bul { color: var(--ink-2); }
  .ribbon nav a.past .bul .ico, .ribbon nav a:hover .bul .ico { opacity: .85; }
  .ribbon nav a[aria-current="page"] .bul { color: var(--ink); }
  .ribbon nav a[aria-current="page"] .bul .ico { opacity: 1; }
}