/* engraft-engram.dev — one stylesheet, light theme only (deliberate) */

@font-face { font-family: "Geist"; font-weight: 400; font-display: swap; src: url("/fonts/geist-sans-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "Geist"; font-weight: 500; font-display: swap; src: url("/fonts/geist-sans-latin-500-normal.woff2") format("woff2"); }
@font-face { font-family: "Geist"; font-weight: 600; font-display: swap; src: url("/fonts/geist-sans-latin-600-normal.woff2") format("woff2"); }
@font-face { font-family: "Geist Mono"; font-weight: 400; font-display: swap; src: url("/fonts/geist-mono-latin-400-normal.woff2") format("woff2"); }
@font-face { font-family: "Geist Mono"; font-weight: 500; font-display: swap; src: url("/fonts/geist-mono-latin-500-normal.woff2") format("woff2"); }

/* Palette: near-white ground, three pastels with a meaning.
   mint = what works, butter = scale and cost, blush = limits and damage. */
:root {
  --bg: #fbfbf9;
  --surface: #ffffff;
  --ink: #17201c;
  --ink-2: #4a5550;
  --ink-3: #5c6661;
  --line: #e8eae5;
  --line-2: #dfe2dc;
  --mint: #e4f3ea;
  --mint-2: #b9e2c9;
  --mint-ink: #2d6a4d;
  --butter: #fcf3d6;
  --butter-2: #f3d98c;
  --butter-ink: #86650f;
  --blush: #fce6e1;
  --blush-2: #f2b3a6;
  --blush-ink: #a3473b;
  --focus: #2d6a4d;
  --sans: "Geist", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "Geist Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --measure: 66ch;
  --wide: 1140px;
  --r: 18px;
  color-scheme: light;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 400 1.0625rem/1.65 var(--sans); -webkit-font-smoothing: antialiased; }
img, svg, canvas { max-width: 100%; }
a { color: inherit; text-decoration-color: var(--mint-2); text-decoration-thickness: 2px; text-underline-offset: 0.2em; }
a:hover { text-decoration-color: var(--mint-ink); }
:focus-visible { outline: 2px solid var(--focus); outline-offset: 3px; border-radius: 6px; }
.skip { position: absolute; left: -999px; top: 0; }
.skip:focus { left: 16px; top: 8px; background: var(--surface); padding: 6px 10px; z-index: 20; }
p { margin: 0; }
strong { font-weight: 600; color: var(--ink); }

/* frame */
.wrap { max-width: var(--wide); margin-inline: auto; padding-inline: clamp(16px, 4vw, 40px); }
.site-head { position: sticky; top: env(safe-area-inset-top, 0px); z-index: 10; background: rgba(251, 251, 249, 0.86); backdrop-filter: saturate(1.4) blur(12px); -webkit-backdrop-filter: saturate(1.4) blur(12px); border-bottom: 1px solid var(--line); }
/* on a phone the wrapped menu is tall: let it scroll away instead of covering a fifth of the screen */
@media (max-width: 640px) { .site-head { position: static; } }
.site-head .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 10px 24px; padding-block: 14px; }
.mark { display: inline-flex; align-items: center; gap: 10px; text-decoration: none; font: 600 1rem/1 var(--sans); letter-spacing: 0.06em; color: var(--ink); }
.mark svg { width: 28px; height: 28px; flex: none; }
.nav { display: flex; flex-wrap: wrap; gap: 2px; font-size: 0.93rem; }
.nav a { text-decoration: none; color: var(--ink-2); padding: 6px 12px; border-radius: 999px; }
.nav a:hover { background: var(--mint); color: var(--ink); }
.nav a[aria-current="page"] { background: var(--ink); color: var(--surface); }
.nav .ext::after { content: " ↗"; font-size: 0.8em; }

main { padding-block: clamp(48px, 8vw, 104px) 96px; }

/* type */
h1, h2, h3 { font-family: var(--sans); font-weight: 600; text-wrap: balance; margin: 0; color: var(--ink); }
h1 { font-size: clamp(2.5rem, 5.6vw, 4.3rem); line-height: 1.03; letter-spacing: -0.038em; }
h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); line-height: 1.12; letter-spacing: -0.025em; }
h3 { font-size: 1.14rem; line-height: 1.3; letter-spacing: -0.01em; }
.eyebrow { font: 500 0.78rem/1.2 var(--mono); letter-spacing: 0.04em; color: var(--ink-3); }
.lede { font-size: clamp(1.14rem, 1.8vw, 1.32rem); line-height: 1.55; color: var(--ink-2); max-width: 58ch; }
.muted { color: var(--ink-2); }
.small { font-size: 0.92rem; }
code, .mono { font-family: var(--mono); font-size: 0.88em; }
.prose pre { margin: 0; padding: 14px 16px; overflow-x: auto; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); font-size: 0.9rem; line-height: 1.5; }

.prose { max-width: var(--measure); display: flex; flex-direction: column; gap: 1.05em; color: var(--ink-2); }
.prose > h2 { margin-top: 1.4em; }
.prose > h3 { margin-top: 0.8em; }
.prose > .eyebrow + h2 { margin-top: -0.3em; }
.prose ul, .prose ol { margin: 0; padding-left: 1.25em; display: flex; flex-direction: column; gap: 0.5em; }
.prose li::marker { color: var(--ink-3); }
.page-head { display: flex; flex-direction: column; gap: 20px; max-width: 54rem; margin-bottom: clamp(44px, 6vw, 72px); }
.page-head h1.title-long { font-size: clamp(1.7rem, 3.4vw, 2.6rem); line-height: 1.15; }
.stack { display: flex; flex-direction: column; gap: clamp(64px, 9vw, 112px); }
.mt { margin-top: 32px; }

/* buttons */
.actions { display: flex; flex-wrap: wrap; gap: 10px; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 11px 18px; border-radius: 999px; text-decoration: none; font-size: 0.95rem; font-weight: 500; background: var(--surface); border: 1px solid var(--line-2); color: var(--ink); }
.btn:hover { border-color: var(--ink); }
.btn.primary { background: var(--ink); border-color: var(--ink); color: var(--surface); }
.btn.primary:hover { background: #2a3731; }

/* hero */
.hero { display: flex; flex-direction: column; gap: clamp(36px, 5vw, 56px); }
.hero-text { display: flex; flex-direction: column; gap: 24px; max-width: 50rem; }
.hero h1 { max-width: 16ch; }

/* illustration panel */
.panel { margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: calc(var(--r) + 6px); padding: clamp(18px, 3vw, 32px); display: flex; flex-direction: column; gap: 18px; }
.panel canvas { width: 100%; height: auto; display: block; }
.legend { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px 24px; font: 400 0.8rem/1.5 var(--mono); color: var(--ink-3); }
.legend ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px 18px; }
.legend li { display: inline-flex; align-items: center; gap: 8px; }
.sw { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.sw.mint { background: var(--mint-2); } .sw.butter { background: var(--butter-2); } .sw.blush { background: var(--blush-2); }

/* three numbers */
.sec-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 8px 24px; margin-bottom: 28px; }
.claims { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; }
.claim { border-radius: var(--r); padding: 26px; display: flex; flex-direction: column; gap: 12px; }
.claim.mint { background: var(--mint); } .claim.butter { background: var(--butter); } .claim.blush { background: var(--blush); }
.claim .figure { font: 600 clamp(2.6rem, 4.6vw, 3.4rem)/1 var(--sans); letter-spacing: -0.04em; font-variant-numeric: tabular-nums; color: var(--ink); }
.claim .figure small { font: 500 0.9rem/1 var(--mono); letter-spacing: 0; color: var(--ink-2); margin-left: 8px; }
.claim p { font-size: 0.94rem; color: var(--ink-2); }
.limit { margin-top: auto; padding-top: 14px; border-top: 1px solid rgba(23, 32, 28, 0.1); display: flex; flex-direction: column; gap: 4px; font-size: 0.9rem; color: var(--ink-2); }
.limit b, .limit-label { font: 500 0.74rem/1.2 var(--mono); letter-spacing: 0.04em; color: var(--blush-ink); }
.source { font: 400 0.76rem/1.4 var(--mono); color: var(--ink-3); overflow-wrap: anywhere; }
.source a { color: var(--ink-3); text-decoration-color: var(--line-2); }
@media (max-width: 860px) { .claims { grid-template-columns: 1fr; } }

/* callout inside prose */
.note { background: var(--blush); border-radius: 14px; padding: 16px 18px; display: flex; flex-direction: column; gap: 6px; font-size: 0.95rem; color: var(--ink-2); }

/* is / is not */
.pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.pair > div { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: clamp(22px, 3vw, 32px); display: flex; flex-direction: column; gap: 14px; }
.ticks { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; color: var(--ink-2); font-size: 0.98rem; }
.ticks li { display: grid; grid-template-columns: 22px minmax(0, 1fr); gap: 10px; }
.ticks li::before { content: ""; width: 20px; height: 20px; border-radius: 50%; margin-top: 3px; background: var(--mint) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M6 10.5l2.6 2.6L14 7.6' fill='none' stroke='%232d6a4d' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center/20px no-repeat; }
.ticks.no li::before { background: var(--blush) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M7 7l6 6M13 7l-6 6' fill='none' stroke='%23a3473b' stroke-width='1.8' stroke-linecap='round'/%3E%3C/svg%3E") center/20px no-repeat; }
.pair ul:not(.ticks) { margin: 0; padding-left: 1.2em; display: flex; flex-direction: column; gap: 0.5em; color: var(--ink-2); }
@media (max-width: 760px) { .pair { grid-template-columns: 1fr; } }

/* band */
.band { background: var(--butter); border-radius: var(--r); padding: clamp(24px, 4vw, 44px); display: grid; grid-template-columns: minmax(0, 0.8fr) minmax(0, 1.4fr); gap: 16px 40px; align-items: start; }
.band > div { display: flex; flex-direction: column; gap: 10px; }
.band p { color: var(--ink-2); }
@media (max-width: 760px) { .band { grid-template-columns: 1fr; } }

/* releases as rows */
.rows { list-style: none; margin: 0; padding: 0; border-top: 1px solid var(--line); }
.rows li { display: grid; grid-template-columns: 6.5rem minmax(0, 1fr) 8rem auto; gap: 8px 24px; align-items: baseline; padding-block: 18px; border-bottom: 1px solid var(--line); }
.pill { display: inline-block; font: 500 0.78rem/1 var(--mono); padding: 6px 10px; border-radius: 999px; background: var(--mint); color: var(--mint-ink); justify-self: start; }
.rows p { color: var(--ink-2); font-size: 0.94rem; margin-top: 4px; }
.rows time { font: 400 0.84rem/1.4 var(--mono); color: var(--ink-3); }
.rows .go { font-size: 0.9rem; white-space: nowrap; }
@media (max-width: 760px) { .rows li { grid-template-columns: 1fr; } }

/* tables */
.table-wrap { overflow-x: auto; max-width: 100%; background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 6px 18px; }
table { border-collapse: collapse; width: 100%; font-size: 0.93rem; color: var(--ink); }
caption { text-align: left; font: 500 0.76rem/1.3 var(--mono); letter-spacing: 0.04em; color: var(--ink-3); padding: 12px 0 6px; }
th, td { padding: 11px 14px 11px 0; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
tbody tr:last-child td { border-bottom: 0; }
thead th { font-weight: 500; font-size: 0.82rem; color: var(--ink-3); }
td.n, th.n { text-align: right; font-family: var(--mono); font-variant-numeric: tabular-nums; white-space: nowrap; }
td.f { font: 400 0.76rem/1.4 var(--mono); color: var(--ink-3); }
td.f a { color: var(--ink-3); text-decoration-color: var(--line-2); }
tr.key td { font-weight: 600; }
tr.key td.n { color: var(--mint-ink); }

/* method steps */
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.step { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 22px; display: flex; flex-direction: column; gap: 10px; font-size: 0.93rem; color: var(--ink-2); }
.step .num { width: 30px; height: 30px; border-radius: 50%; display: grid; place-items: center; font: 500 0.82rem/1 var(--mono); }
.step:nth-child(1) .num { background: var(--mint); color: var(--mint-ink); }
.step:nth-child(2) .num { background: var(--butter); color: var(--butter-ink); }
.step:nth-child(3) .num { background: var(--mint); color: var(--mint-ink); }
.step:nth-child(4) .num { background: var(--blush); color: var(--blush-ink); }
.step h3 { font-size: 1.05rem; }
.tokens { display: flex; flex-wrap: wrap; gap: 4px; font: 400 0.8rem/1 var(--mono); }
.tokens span { background: var(--bg); border: 1px solid var(--line); padding: 5px 7px; border-radius: 6px; color: var(--ink); }
.tokens span.w { background: var(--butter); border-color: var(--butter-2); }
@media (max-width: 900px) { .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 480px) { .steps { grid-template-columns: 1fr; } }

/* timeline */
.phase { margin-top: 56px; margin-bottom: 20px; font-size: 1.35rem; }
.page-head + .phase { margin-top: 0; }
.log { list-style: none; margin: 0; padding: 0 0 0 26px; border-left: 2px solid var(--line); display: flex; flex-direction: column; gap: 26px; max-width: 52rem; }
.log li { position: relative; display: flex; flex-direction: column; gap: 6px; }
.log li::before { content: ""; position: absolute; left: -33px; top: 6px; width: 12px; height: 12px; border-radius: 50%; background: var(--mint-2); box-shadow: 0 0 0 4px var(--bg); }
.log time { font: 400 0.82rem/1.4 var(--mono); color: var(--ink-3); }
.log p { color: var(--ink-2); font-size: 0.97rem; }

/* open problems */
.open { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
.open li { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 22px; display: flex; flex-direction: column; gap: 10px; }
.open p { font-size: 0.94rem; color: var(--ink-2); }
.credit { align-self: flex-start; margin-top: auto; font: 500 0.76rem/1 var(--mono); padding: 6px 10px; border-radius: 999px; background: var(--butter); color: var(--butter-ink); }
@media (max-width: 760px) { .open { grid-template-columns: 1fr; } }

/* faq */
.faq { display: flex; flex-direction: column; gap: 10px; max-width: 52rem; }
.faq details { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 18px 22px; }
.faq summary { cursor: pointer; font-weight: 600; font-size: 1.06rem; line-height: 1.35; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; font: 500 1.1rem/1 var(--mono); color: var(--mint-ink); }
.faq details[open] summary::after { content: "−"; }
/* Quail corpus explainer: closed, each row shows a one-line summary */
.corpus { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; align-items: start; }
@media (max-width: 760px) { .corpus { grid-template-columns: minmax(0, 1fr); } }
.corpus details { background: var(--surface); border: 1px solid var(--line); border-radius: 14px; padding: 16px 20px; }
.corpus details[open] { grid-column: 1 / -1; }
.corpus summary { cursor: pointer; list-style: none; display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 2px 16px; }
.corpus summary::-webkit-details-marker { display: none; }
.corpus summary::after { content: "+"; grid-column: 2; grid-row: 1 / span 2; align-self: center; font: 500 1.1rem/1 var(--mono); color: var(--mint-ink); }
.corpus details[open] summary::after { content: "−"; }
.corpus .s-t { font-weight: 600; color: var(--ink); }
.corpus .s-d { font-size: 0.92rem; color: var(--ink-2); }
.corpus .a { padding-top: 12px; display: flex; flex-direction: column; gap: 0.8em; color: var(--ink-2); max-width: var(--measure); }
.corpus-h { font-size: 1.2rem; margin-bottom: 12px; }
.forms { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.forms li { display: grid; grid-template-columns: 7.5rem minmax(0, 1fr); gap: 2px 14px; padding-bottom: 10px; border-bottom: 1px solid var(--line); }
.forms b { font: 500 0.78rem/1.6 var(--mono); color: var(--ink-3); grid-row: 1 / span 2; }
.forms span { font: 400 0.9rem/1.5 var(--mono); color: var(--ink); overflow-wrap: anywhere; }
.forms i { font-size: 0.88rem; color: var(--ink-3); }
.forms mark { background: var(--butter-2); color: var(--ink); border-radius: 4px; padding: 0 3px; }
@media (max-width: 480px) { .forms li { grid-template-columns: minmax(0, 1fr); } .forms b { grid-row: auto; } }
.faq .a { padding-top: 12px; display: flex; flex-direction: column; gap: 0.8em; color: var(--ink-2); }

/* footer */
.site-foot { border-top: 1px solid var(--line); padding-block: 40px 56px; font-size: 0.92rem; color: var(--ink-2); }
.site-foot .wrap { display: grid; grid-template-columns: minmax(0, 1.5fr) repeat(2, minmax(0, 1fr)); gap: 28px; }
.site-foot h2 { font: 500 0.76rem/1.2 var(--mono); letter-spacing: 0.04em; color: var(--ink-3); margin-bottom: 12px; }
.site-foot ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 7px; }
.site-foot a { text-decoration: none; }
.site-foot a:hover { color: var(--ink); text-decoration: underline; text-decoration-color: var(--mint-2); }
.site-foot .brand { display: flex; flex-direction: column; gap: 12px; max-width: 36ch; }
.stamp { font: 400 0.78rem/1.55 var(--mono); color: var(--ink-3); }
@media (max-width: 760px) { .site-foot .wrap { grid-template-columns: 1fr; } }

@media (prefers-reduced-motion: reduce) { * { scroll-behavior: auto !important; transition: none !important; animation: none !important; } }

/* charts: horizontal bars on a 0–1 scale unless the figure says otherwise */
.chart { margin: 0; background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: clamp(18px, 3vw, 28px); display: flex; flex-direction: column; gap: 18px; }
.chart-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 8px 20px; }
.chart-head h3 { font-size: 1.02rem; }
.key { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 16px; font: 400 0.78rem/1.4 var(--mono); color: var(--ink-3); }
.key li { display: inline-flex; align-items: center; gap: 7px; }
.key i { width: 10px; height: 10px; border-radius: 3px; display: inline-block; }
.bars { display: flex; flex-direction: column; gap: 14px; }
.bar-group { display: flex; flex-direction: column; gap: 6px; }
.bar-group > .bl { font-size: 0.9rem; color: var(--ink); }
.bar-row { display: grid; grid-template-columns: minmax(0, 1fr) 4.6rem; gap: 12px; align-items: center; }
.bar-row.lab { grid-template-columns: 9.5rem minmax(0, 1fr) 4.6rem; }
.bar-row .bl { font-size: 0.88rem; color: var(--ink-2); }
.track { height: 12px; border-radius: 4px; background: var(--bg); position: relative; }
.track .b { position: absolute; left: 0; top: 0; bottom: 0; width: calc(var(--v) * 100%); min-width: 3px; border-radius: 0 4px 4px 0; }
.b.ov { background: #3f9a6e; } .b.base { background: #b8bfb9; } .b.cap { background: #d6a63a; } .b.dmg { background: #d77a6c; } .b.yard { background: #b8bfb9; }
.key .ov { background: #3f9a6e; } .key .base { background: #b8bfb9; } .key .cap { background: #d6a63a; } .key .dmg { background: #d77a6c; }
.bv { font: 500 0.86rem/1 var(--mono); font-variant-numeric: tabular-nums; text-align: right; color: var(--ink); }
.bv.dim { color: var(--ink-3); font-weight: 400; }
.chart .source { margin-top: -4px; }
.charts2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; }
@media (max-width: 820px) { .charts2 { grid-template-columns: minmax(0, 1fr); } }
@media (max-width: 520px) { .bar-row.lab { grid-template-columns: minmax(0, 1fr) 4.2rem; } .bar-row.lab .bl { grid-column: 1 / -1; } }

/* stat pairs for the mirror test */
.mirror { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; }
.mirror > div { background: var(--surface); border: 1px solid var(--line); border-radius: var(--r); padding: 22px; display: flex; flex-direction: column; gap: 8px; }
.mirror .eq { font: 600 1.9rem/1.1 var(--sans); letter-spacing: -0.03em; font-variant-numeric: tabular-nums; color: var(--ink); }
.mirror .eq span { color: var(--ink-3); font-weight: 400; margin-inline: 6px; }
.mirror p { font-size: 0.9rem; color: var(--ink-2); }
@media (max-width: 980px) { .mirror { grid-template-columns: repeat(2, minmax(0, 1fr)); } } @media (max-width: 520px) { .mirror { grid-template-columns: 1fr; } }
.wide { max-width: none; }

/* waffle: one square per item */
.waffle { display: grid; grid-template-columns: repeat(auto-fill, minmax(14px, 1fr)); gap: 4px; width: 100%; max-width: 560px; min-width: 0; }
.waffle i, .key i.ov, .key i.cap, .key i.dmg, .key i.base, .key i.mint, .key i.butter, .key i.blush { aspect-ratio: 1; border-radius: 3px; display: block; }
.waffle i.ov, .key i.ov { background: #3f9a6e; }
.waffle i.cap, .key i.cap { background: #d6a63a; }
.waffle i.dmg, .key i.dmg { background: #d77a6c; }
.waffle i.base, .key i.base { background: #e3e6e1; }
.waffle i.mint { background: var(--mint-2); } .waffle i.butter { background: var(--butter-2); } .waffle i.blush { background: var(--blush-2); }
.key i { width: 10px; height: 10px; }

/* inline illustrations */
.illo { width: 100%; height: auto; display: block; }
.illo text { font-family: var(--mono); fill: var(--ink-2); }
.illo .t-ink { fill: var(--ink); }
.illo .t-h { font-family: var(--sans); font-weight: 600; fill: var(--ink); }
.mirror.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
@media (max-width: 520px) { .mirror.two { grid-template-columns: 1fr; } }
.open .step, .open > div { background: var(--surface); }
.claim .bar-row.lab { grid-template-columns: 6.2rem minmax(0, 1fr) 3.8rem; }

/* mechanism diagram, one 7 s cycle: windows → rows light → block 1 → up the stack.
   Every element's resting state is the complete picture. */
.mech-anim .m-lit, .mech-anim .m-ring, .mech-anim .m-b1, .mech-anim .m-top rect { transform-box: fill-box; transform-origin: center; }
@media (prefers-reduced-motion: no-preference) {
  .mech-anim .m-bi, .mech-anim .m-tri { animation: m-win 7s ease-in-out infinite; }
  .mech-anim .m-tri { animation-delay: 0.25s; }
  .mech-anim .m-flow { stroke-dasharray: 5 5; animation: m-flow 0.9s linear infinite; }
  .mech-anim .m-lit { animation: m-cell 7s ease-out infinite; animation-delay: calc(var(--i) * 0.07s); }
  .mech-anim .m-ring { animation: m-ring 7s ease-in-out infinite; }
  .mech-anim .m-b1 { animation: m-b1 7s ease-in-out infinite; }
  .mech-anim .m-top rect { animation: m-top 7s ease-in-out infinite; }
}
@keyframes m-flow { to { stroke-dashoffset: -10; } }
@keyframes m-win { 0%, 100% { opacity: 0.35; } 6%, 80% { opacity: 1; } }
@keyframes m-cell {
  0%, 20% { fill: #f4f5f2; transform: scale(1); }
  26% { fill: var(--c); transform: scale(1.28); }
  32%, 88% { fill: var(--c); transform: scale(1); }
  100% { fill: #f4f5f2; }
}
@keyframes m-ring { 0%, 34% { opacity: 0; } 40% { opacity: 1; transform: scale(1.35); } 46%, 88% { opacity: 1; transform: scale(1); } 100% { opacity: 0; } }
@keyframes m-b1 { 0%, 48% { fill: #e4f3ea; transform: scale(1); } 55% { fill: #b9e2c9; transform: scale(1.06); } 64%, 88% { fill: #b9e2c9; transform: scale(1); } 100% { fill: #e4f3ea; } }
@keyframes m-top { 0%, 64% { fill: #ffffff; } 72%, 88% { fill: #e4f3ea; } 100% { fill: #ffffff; } }

/* interactive hero */
.play-head { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 16px; }
.play-head label { font: 500 0.8rem/1.2 var(--mono); color: var(--ink-3); }
.play-head input { flex: 1 1 260px; min-width: 0; font: 400 1rem/1.4 var(--sans); color: var(--ink); background: var(--bg); border: 1px solid var(--line-2); border-radius: 999px; padding: 9px 16px; }
.play-head input:focus { outline: none; border-color: var(--mint-ink); box-shadow: 0 0 0 3px var(--mint); }
.toks { display: flex; flex-wrap: wrap; gap: 6px; min-height: 40px; }
.tok { font: 400 0.95rem/1 var(--mono); color: var(--ink-2); background: var(--surface); border: 1px solid var(--line-2); border-radius: 999px; padding: 9px 13px; cursor: pointer; transition: background 0.2s, border-color 0.2s, color 0.2s; }
.tok:hover { border-color: var(--ink); color: var(--ink); }
.tok.in-tri { background: var(--butter); border-color: var(--butter-2); color: var(--ink); }
.tok.in-bi { background: var(--mint); border-color: var(--mint-2); color: var(--ink); }
.tok.cur { border-color: var(--ink); box-shadow: 0 0 0 2px var(--surface), 0 0 0 3.5px var(--ink); }
.status { font-size: 0.95rem; color: var(--ink-2); min-height: 1.6em; }
.status.fires { color: var(--blush-ink); }
.status strong { font-family: var(--mono); font-weight: 500; font-size: 0.92em; }

/* 841-sentence explorer */
.exp-top { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 14px 24px; }
.seg { display: inline-flex; flex-wrap: wrap; gap: 4px; background: var(--bg); border: 1px solid var(--line); border-radius: 999px; padding: 4px; }
.seg button { font: 500 0.9rem/1 var(--sans); color: var(--ink-2); background: transparent; border: 0; border-radius: 999px; padding: 9px 14px; cursor: pointer; }
.seg button:hover { color: var(--ink); }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--surface); }
.exp-count { font: 600 clamp(2.2rem, 4.5vw, 3.2rem)/1 var(--sans); letter-spacing: -0.04em; font-variant-numeric: tabular-nums; }
.exp-count small { font: 500 0.95rem/1 var(--mono); letter-spacing: 0; color: var(--ink-3); margin-left: 8px; }
.dots { display: grid; grid-template-columns: repeat(29, minmax(0, 1fr)); gap: 3px; max-width: 760px; }
.dots i { aspect-ratio: 1; border-radius: 50%; background: #e3e6e1; transition: background-color 0.35s ease, transform 0.35s ease; cursor: pointer; }
.dots i.ok { background: #3f9a6e; }
.dots i:hover { transform: scale(1.5); }
.dots i.sel { box-shadow: 0 0 0 2px var(--surface), 0 0 0 3.5px var(--ink); }
.dots i:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; }
.exp-detail { min-height: 7.5rem; display: flex; flex-direction: column; gap: 10px; }
.exp-detail .q { font-size: 1.02rem; color: var(--ink); }
.exp-detail .fam { display: block; font: 400 0.76rem/1.4 var(--mono); color: var(--ink-3); margin-bottom: 2px; }
.exp-detail .gap { background: var(--butter); border-radius: 6px; padding: 1px 7px; font-weight: 500; }
.ans { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; }
.ans li { background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; display: flex; flex-direction: column; gap: 4px; font-size: 0.9rem; }
.ans li.on { border-color: var(--ink); }
.ans span { font: 400 0.74rem/1.3 var(--mono); color: var(--ink-3); }
.ans b { font-weight: 500; color: var(--ink); }
.ans .yes { color: var(--mint-ink); } .ans .no { color: var(--blush-ink); }
@media (max-width: 640px) { .ans { grid-template-columns: 1fr; } .dots { gap: 2px; } }
@media (prefers-reduced-motion: reduce) { .dots i { transition: none; } }
.exp-body { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(260px, 1fr); gap: 24px; align-items: start; }
.exp-body .ans { grid-template-columns: 1fr; }
@media (max-width: 900px) { .exp-body { grid-template-columns: 1fr; } .exp-body .ans { grid-template-columns: repeat(3, minmax(0, 1fr)); } }
@media (max-width: 640px) { .exp-body .ans { grid-template-columns: 1fr; } }

/* simulator */
.sim { display: grid; grid-template-columns: minmax(280px, 380px) minmax(0, 1fr); gap: 24px; align-items: start; }
.sim-side { display: flex; flex-direction: column; gap: 16px; position: sticky; top: 84px; }
.sim-hint { margin: 0; padding: 10px 12px; border-radius: 10px; background: var(--mint); color: var(--mint-ink); font-size: 0.9rem; line-height: 1.45; }
.sim-grid { display: grid; gap: 4px; }
.sim-grid.chat { grid-template-columns: repeat(14, minmax(0, 1fr)); }
.sim-grid.sent { grid-template-columns: repeat(29, minmax(0, 1fr)); gap: 2px; }
.sim-grid button { aspect-ratio: 1; border: 0; padding: 0; border-radius: 5px; cursor: pointer; transition: transform 0.15s ease; }
.sim-grid.sent button { border-radius: 2px; }
.sim-grid button:hover { transform: scale(1.35); position: relative; z-index: 1; }
.sim-grid button[aria-selected="true"] { box-shadow: 0 0 0 2px var(--surface), 0 0 0 4px var(--ink); position: relative; z-index: 2; }
.sim-scale { display: flex; flex-direction: column; gap: 6px; font: 400 0.78rem/1.4 var(--mono); color: var(--ink-3); }
.sim-scale span { display: inline-flex; align-items: center; gap: 8px; }
.sim-scale i { width: 12px; height: 12px; border-radius: 3px; display: inline-block; }
.sim-scale .bar i { width: 100%; height: 10px; border-radius: 5px; }
.sim-scale .bar { display: block; }
.sim-scale span.t { display: block; }
.sim-scale strong { color: var(--ink-2); font-weight: 600; }
/* a dark dot marks the cells whose full answer is not exact: the colour only reports the first token */
.sim-grid.sent button.miss, .sim-scale i.miss-key { background-image: radial-gradient(circle, var(--ink) 0 26%, transparent 30%); }
.sim-scale i.miss-key { background-color: #6dbb8f; }
.sim-grid button.dim { opacity: 0.16; }
.sim-grid button:focus-visible { outline: 2px solid var(--focus); outline-offset: 2px; position: relative; z-index: 3; }
.sim-find { display: flex; flex-direction: column; gap: 10px; }
.sim-search { display: flex; align-items: center; gap: 10px; font: 500 0.78rem/1 var(--mono); color: var(--ink-3); }
.sim-search input { flex: 1; min-width: 0; font: 400 0.92rem/1.2 var(--sans); color: var(--ink); background: var(--surface); border: 1px solid var(--line-2); border-radius: 999px; padding: 9px 14px; }
.sim-search input:focus-visible { outline: 2px solid var(--focus); outline-offset: 1px; }
.sim-find .small { margin: 0; }
.btn:disabled { opacity: 0.45; cursor: default; }
.linkish { font: inherit; color: var(--ink); background: none; border: 0; padding: 0; text-decoration: underline; cursor: pointer; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }

.term { background: var(--surface); border: 1px solid var(--line-2); border-radius: 16px; overflow: hidden; box-shadow: 0 1px 2px rgba(23, 32, 28, 0.04), 0 12px 32px -18px rgba(23, 32, 28, 0.18); }
.term-bar { display: flex; align-items: center; gap: 14px; padding: 12px 16px; background: var(--bg); border-bottom: 1px solid var(--line); font: 400 0.8rem/1.2 var(--mono); color: var(--ink-3); }
.lights { display: inline-flex; gap: 6px; }
.lights i { width: 11px; height: 11px; border-radius: 50%; display: block; }
.lights i:nth-child(1) { background: #f2b3a6; } .lights i:nth-child(2) { background: #f3d98c; } .lights i:nth-child(3) { background: #b9e2c9; }
.term-title { color: var(--ink-2); }
.term-meta { margin-left: auto; text-align: right; }
.term-cols { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); min-height: 420px; }
.term-col { display: flex; flex-direction: column; min-width: 0; }
.term-col + .term-col { border-left: 1px solid var(--line); }
.term-col header { display: flex; justify-content: space-between; align-items: center; padding: 12px 18px; font: 500 0.84rem/1 var(--sans); color: var(--ink-2); border-bottom: 1px dashed var(--line); }
.term-col.ov header { background: var(--mint); color: var(--mint-ink); }
.res { font: 500 0.74rem/1 var(--mono); padding: 5px 9px; border-radius: 999px; }
.res.yes { background: var(--mint-2); color: var(--mint-ink); }
.res.no { background: var(--blush); color: var(--blush-ink); }
.thread { padding: 18px; display: flex; flex-direction: column; gap: 14px; font: 400 0.92rem/1.6 var(--mono); color: var(--ink); }
.msg { display: flex; flex-direction: column; gap: 4px; }
.msg .who { font: 500 0.72rem/1 var(--mono); color: var(--ink-3); }
.msg.q .txt { background: var(--bg); border: 1px solid var(--line); border-radius: 12px; padding: 10px 12px; }
.msg.a .txt { padding: 0 2px; overflow-wrap: anywhere; }
.msg.a.ov .who { color: var(--mint-ink); }
.txt.typing::after { content: "▍"; color: var(--ink-3); animation: blink 1s steps(1) infinite; }
@keyframes blink { 50% { opacity: 0; } }
.thread mark, .term-foot mark { background: var(--butter-2); color: var(--ink); border-radius: 4px; padding: 0 3px; }
.cut { color: var(--ink-3); font-size: 0.85em; }
.term-foot { padding: 12px 18px; border-top: 1px solid var(--line); background: var(--bg); font: 400 0.8rem/1.5 var(--mono); color: var(--ink-2); }
@media (max-width: 980px) { .sim { grid-template-columns: 1fr; } .sim-side { position: static; } }
@media (max-width: 640px) { .term-cols { grid-template-columns: 1fr; } .term-col + .term-col { border-left: 0; border-top: 1px solid var(--line); } .term-cols { min-height: 0; } }

/* early-stage notice, every page */
.stage { background: var(--butter); border-bottom: 1px solid var(--butter-2); font-size: 0.86rem; color: var(--ink-2); }
.stage .wrap { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 12px; padding-block: 9px; }
.stage-tag { font: 500 0.72rem/1 var(--mono); letter-spacing: 0.04em; background: var(--surface); color: var(--butter-ink); border: 1px solid var(--butter-2); border-radius: 999px; padding: 5px 9px; }
.stage-band { background: var(--mint); }
.where { display: flex; flex-direction: column; gap: 12px; color: var(--ink-2); }
.page-head .note { max-width: 58ch; background: var(--butter); }
.msg .ctx { color: var(--ink-3); }
.msg .txt span.typing::after { content: "▍"; color: var(--ink-3); animation: blink 1s steps(1) infinite; }
/* tick lists: the marker is positioned, so inline <strong>/<code> stay in the text flow */
.ticks li { display: block; position: relative; padding-left: 32px; }
.ticks li::before { position: absolute; left: 0; top: 0; }