/* Is KMAP possible? — the demo. Same tokens as the ICMS 2026 poster. Mobile first. */

@font-face { font-family: "Archivo"; src: url(../fonts/Archivo-VF.woff2) format("woff2"); font-weight: 100 900; font-stretch: 62% 125%; font-display: swap; }
@font-face { font-family: "Archivo"; src: url(../fonts/Archivo-Italic-VF.woff2) format("woff2"); font-weight: 100 900; font-stretch: 62% 125%; font-style: italic; font-display: swap; }
@font-face { font-family: "Caladea"; src: url(../fonts/Caladea-Regular.woff2) format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Caladea"; src: url(../fonts/Caladea-Bold.woff2) format("woff2"); font-weight: 700; font-display: swap; }
@font-face { font-family: "Caladea"; src: url(../fonts/Caladea-Italic.woff2) format("woff2"); font-weight: 400; font-style: italic; font-display: swap; }
@font-face { font-family: "Plex Mono"; src: url(../fonts/IBMPlexMono-Regular.woff2) format("woff2"); font-weight: 400; font-display: swap; }
@font-face { font-family: "Plex Mono"; src: url(../fonts/IBMPlexMono-Medium.woff2) format("woff2"); font-weight: 500; font-display: swap; }
@font-face { font-family: "Plex Mono"; src: url(../fonts/IBMPlexMono-SemiBold.woff2) format("woff2"); font-weight: 600; font-display: swap; }
@font-face { font-family: "STIX Two Math"; src: url(../fonts/STIXTwoMath-subset.woff2) format("woff2"); font-display: swap; }
@font-face { font-family: "Lean Symbols"; src: url(../fonts/LeanSymbols-DejaVuSansMono.woff2) format("woff2"); font-display: swap; }

:root {
  color-scheme: light;
  --paper: #FFFFFF; --wash: #F1F5F8; --wash-2: #E6EDF2; --rule: #C9D4DE;
  --ink: #14304F; --ink-2: #4A5B6E; --ink-3: #7B8A99;
  --teal: #1E86A8; --teal-wash: #EAF5F9; --gold: #8C7518; --gold-wash: #FBF7E6;
  --flip: #E8871E; --flip-wash: #FDF0E1;
  --ok: #0B7A3E; --bad: #C0392B;
  --code-bg: #0F2740; --code-ink: #E8EEF4; --code-k: #F2B563; --code-n: #8FD3E8; --code-c: #8C9DB0; --code-t: #B9E4A6;
  --cell-0: #FFFFFF; --cell-1: #DCE3EA; --cell-2: #B6C3D1; --cell-3: #8C9FB4; --cell-4: #5E7896; --cell-5: #35557A; --cell-6: #14304F;
  --g-hydrophobic: #9b6a1c; --g-aromatic: #4a3aa7; --g-sulfur: #008300; --g-breaker: #e87ba4; --g-polar: #1baf7a; --g-negative: #e34948; --g-positive: #2a78d6;
  --sans: "Archivo", system-ui, -apple-system, "Segoe UI", sans-serif;
  --serif: "Caladea", Cambria, Georgia, serif;
  --mono: "Plex Mono", "Lean Symbols", ui-monospace, Menlo, Consolas, monospace;
  --radius: 14px; --gap: 16px;
  --shadow: 0 1px 0 rgba(20, 48, 79, 0.06), 0 8px 24px -12px rgba(20, 48, 79, 0.25);
  --top-h: 56px; --bottom-h: 68px;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper: #0D1824; --wash: #142333; --wash-2: #1B2E42; --rule: #2A3E53;
    --ink: #E8EEF4; --ink-2: #B3C1CF; --ink-3: #8193A6;
    --teal: #4FB4D6; --teal-wash: #12303D; --gold: #D9BD55; --gold-wash: #2B2711;
    --flip: #F29A3A; --flip-wash: #3A2710; --ok: #3DD68C; --bad: #FF7B6B;
    --code-bg: #07121D;
    --cell-0: #0D1824; --cell-1: #1D3246; --cell-2: #2C4A66; --cell-3: #3F6687; --cell-4: #5E88AC; --cell-5: #8FB2CF; --cell-6: #D6E4F0;
    --shadow: 0 1px 0 rgba(0, 0, 0, 0.3), 0 10px 28px -14px rgba(0, 0, 0, 0.7);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #0D1824; --wash: #142333; --wash-2: #1B2E42; --rule: #2A3E53;
  --ink: #E8EEF4; --ink-2: #B3C1CF; --ink-3: #8193A6;
  --teal: #4FB4D6; --teal-wash: #12303D; --gold: #D9BD55; --gold-wash: #2B2711;
  --flip: #F29A3A; --flip-wash: #3A2710; --ok: #3DD68C; --bad: #FF7B6B; --code-bg: #07121D;
  --cell-0: #0D1824; --cell-1: #1D3246; --cell-2: #2C4A66; --cell-3: #3F6687; --cell-4: #5E88AC; --cell-5: #8FB2CF; --cell-6: #D6E4F0;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--paper); color: var(--ink);
  font: 17px/1.5 var(--serif); font-kerning: normal;
  padding-top: var(--top-h); padding-bottom: calc(var(--bottom-h) + env(safe-area-inset-bottom));
  overflow-x: hidden;
}
button, input, select { font: inherit; color: inherit; }
a { color: var(--teal); text-underline-offset: 3px; }
:focus-visible { outline: 3px solid var(--flip); outline-offset: 2px; border-radius: 6px; }
.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: var(--paper); padding: 8px 12px; border-radius: 8px; z-index: 50; }
.skip:focus { left: 8px; }
[hidden] { display: none !important; }

/* ── top bar ─────────────────────────────────────────────────────────────── */
.top {
  position: fixed; inset: 0 0 auto 0; height: var(--top-h); z-index: 20;
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 0 max(14px, env(safe-area-inset-left)); background: color-mix(in srgb, var(--paper) 97%, transparent);
  border-bottom: 1px solid var(--rule);
}
.brand { display: flex; align-items: center; gap: 9px; text-decoration: none; color: var(--ink); font: 700 16px/1 var(--sans); font-stretch: 90%; min-height: 44px; }
.brand svg { width: 22px; height: 22px; }
.brand rect { fill: none; stroke: var(--ink); stroke-width: 1.6; }
.brand rect.on { fill: var(--flip); stroke: var(--flip); }
.chip {
  min-height: 40px; max-width: 58vw; padding: 6px 12px; border-radius: 999px; border: 1px solid var(--rule); background: var(--wash);
  font: 600 14px/1.2 var(--sans); font-stretch: 92%; cursor: pointer; white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.chip .muted { color: var(--ink-3); font-weight: 500; }

/* ── chapter ─────────────────────────────────────────────────────────────── */
main { max-width: 760px; margin: 0 auto; padding: 18px max(16px, env(safe-area-inset-left)) 28px; outline: none; }
.chapter-head { display: flex; align-items: center; gap: 12px; margin: 6px 0 4px; min-height: 30px; }
.gc { display: inline-flex; gap: 3px; }
.gc b { display: inline-grid; place-items: center; width: 22px; height: 26px; border-radius: 6px; background: var(--wash); color: var(--ink-3); font: 600 15px/1 var(--mono); }
.gc b.flip { background: var(--flip); color: #fff; }
.chapter-head .count { font: 500 13px/1 var(--sans); color: var(--ink-3); letter-spacing: 0.01em; }
h1, h2, h3 { font-family: var(--sans); color: var(--ink); margin: 0; line-height: 1.12; }
h1 { font-size: clamp(28px, 7.6vw, 40px); font-weight: 780; font-stretch: 88%; letter-spacing: -0.01em; margin: 4px 0 10px; }
h2 { font-size: 21px; font-weight: 720; font-stretch: 90%; margin: 26px 0 8px; }
h3 { font-size: 17px; font-weight: 700; font-stretch: 92%; margin: 18px 0 6px; }
.hook { font-size: 20px; line-height: 1.4; color: var(--ink-2); margin: 0 0 18px; }
p { margin: 0 0 12px; }
.small { font-size: 15px; color: var(--ink-2); }
.num { font-family: var(--sans); font-weight: 700; font-stretch: 92%; font-variant-numeric: tabular-nums; }
code, .mono { font-family: var(--mono); font-size: 0.88em; }
.chapter { animation: rise 420ms cubic-bezier(.2,.7,.2,1) both; }
@keyframes rise { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .chapter { animation: none; } * { scroll-behavior: auto !important; } }

/* ── visual frame ────────────────────────────────────────────────────────── */
.stage { position: relative; background: var(--wash); border-radius: var(--radius); padding: 14px; margin: 6px 0 16px; overflow: hidden; }
.stage.white { background: var(--paper); border: 1px solid var(--rule); }
.stage canvas, .stage svg { display: block; max-width: 100%; }
.stage .cap { font: 500 13.5px/1.35 var(--sans); color: var(--ink-2); margin-top: 10px; }
.stage .cap b { color: var(--ink); }
.readout { font: 600 15px/1.35 var(--sans); font-stretch: 94%; color: var(--ink); min-height: 1.35em; }
.readout .mono { font-weight: 500; }
.row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.grow { flex: 1 1 auto; min-width: 0; }
.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(128px, 1fr)); gap: 10px; margin: 8px 0 16px; }
.stat { background: var(--paper); border: 1px solid var(--rule); border-radius: 12px; padding: 10px 12px; }
.stat .v { font: 760 24px/1.05 var(--sans); font-stretch: 88%; }
.stat .l { font: 500 13px/1.3 var(--sans); color: var(--ink-2); margin-top: 3px; }
.stat.ok .v { color: var(--ok); }

/* ── controls ────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px; min-height: 46px; padding: 10px 18px;
  border-radius: 12px; border: 1px solid var(--ink); background: var(--ink); color: var(--paper);
  font: 650 16px/1 var(--sans); font-stretch: 92%; cursor: pointer; text-decoration: none;
}
.btn.ghost { background: transparent; color: var(--ink); border-color: var(--rule); }
.btn.small { min-height: 38px; padding: 8px 12px; font-size: 14.5px; border-radius: 10px; }
.btn:disabled { opacity: 0.55; cursor: progress; }
.seg { display: inline-flex; border: 1px solid var(--rule); border-radius: 12px; overflow: hidden; background: var(--paper); }
.seg button { min-height: 40px; min-width: 44px; padding: 6px 12px; border: 0; background: transparent; font: 600 14.5px/1 var(--sans); font-stretch: 92%; cursor: pointer; color: var(--ink-2); }
.seg button[aria-pressed="true"] { background: var(--ink); color: var(--paper); }
input[type="search"], input[type="text"] {
  width: 100%; min-height: 50px; padding: 12px 14px; border-radius: 12px; border: 1.5px solid var(--rule); background: var(--paper);
  font: 500 17px/1.2 var(--sans); outline: none;
}
input[type="search"]:focus, input[type="text"]:focus { border-color: var(--ink); }
input[type="range"] { width: 100%; accent-color: var(--flip); min-height: 36px; }

/* example chips and search results */
.examples { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; margin: 12px 0 18px; }
.ex {
  text-align: left; padding: 12px; border-radius: 12px; border: 1px solid var(--rule); background: var(--paper); cursor: pointer; min-height: 88px;
  display: flex; flex-direction: column; gap: 3px; box-shadow: var(--shadow);
}
.ex .id { font: 700 13px/1 var(--mono); color: var(--ink-3); }
.ex .nm { font: 700 16px/1.15 var(--sans); font-stretch: 92%; }
.ex .bl { font: 500 13px/1.3 var(--sans); color: var(--ink-2); }
.ex .kind { align-self: flex-start; font: 600 11.5px/1 var(--sans); padding: 3px 7px; border-radius: 999px; background: var(--wash); color: var(--ink-2); margin-top: auto; }
.results { list-style: none; margin: 8px 0 0; padding: 0; display: grid; gap: 8px; }
.results button { width: 100%; text-align: left; padding: 10px 12px; border-radius: 12px; border: 1px solid var(--rule); background: var(--paper); cursor: pointer; min-height: 56px; }
.results .id { font: 600 13px/1 var(--mono); color: var(--ink-3); }
.results .t { font: 600 15px/1.25 var(--sans); font-stretch: 94%; display: block; margin-top: 3px; }
.results .m { font: 500 12.5px/1.3 var(--sans); color: var(--ink-2); }
.entry-card { border: 1px solid var(--rule); border-radius: var(--radius); padding: 14px; background: var(--paper); margin: 12px 0; box-shadow: var(--shadow); }
.entry-card .t { font: 700 18px/1.2 var(--sans); font-stretch: 92%; margin: 2px 0 6px; }
.entry-card .m { font: 500 14px/1.4 var(--sans); color: var(--ink-2); }
.chains { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.chains button { min-height: 40px; padding: 6px 12px; border-radius: 10px; border: 1px solid var(--rule); background: var(--wash); font: 600 14px/1 var(--sans); cursor: pointer; }
.chains button[aria-pressed="true"] { background: var(--ink); color: var(--paper); border-color: var(--ink); }

/* ── sequence tiles and bits ─────────────────────────────────────────────── */
.seq { display: flex; flex-wrap: wrap; gap: 3px; font: 700 14px/1 var(--mono); }
.seq span { display: inline-grid; place-items: center; width: 22px; height: 24px; border-radius: 5px; color: #fff; cursor: pointer; }
.seq span.sel { outline: 3px solid var(--flip); outline-offset: 1px; }
.bitrow { font: 500 15px/1.6 var(--mono); letter-spacing: 0.04em; white-space: nowrap; overflow-x: auto; }
.bit-on { color: var(--ink); } .bit-off { color: var(--ink-3); }
.bit-flip { background: var(--flip); color: #fff; border-radius: 4px; padding: 0 2px; }

/* ── theorem cards ───────────────────────────────────────────────────────── */
.theorems { display: grid; gap: 12px; margin: 10px 0 8px; }
.thm { border: 1px solid var(--rule); border-radius: var(--radius); background: var(--paper); overflow: hidden; }
.thm header { display: flex; align-items: baseline; gap: 8px; padding: 10px 12px 0; flex-wrap: wrap; }
.thm .proved { font: 650 13px/1.2 var(--sans); color: var(--gold); }
.thm .proved::before { content: "⊢ "; font-weight: 800; }
.thm .kind { font: 500 12px/1 var(--sans); color: var(--ink-3); margin-left: auto; }
/* the statement: typeset mathematics (MathML), in pieces that wrap like words on a phone */
.thm .stmt { margin: 8px 12px 0; padding: 10px 12px; border-radius: 10px; background: var(--wash); color: var(--ink);
  display: flex; flex-wrap: wrap; align-items: baseline; column-gap: .55em; row-gap: .25em; overflow-x: auto; }
.thm .where { padding: 6px 12px 0; margin: 0; font-size: 13.5px; line-height: 1.45; color: var(--ink-2); }
.thm .meaning { padding: 6px 12px 0; margin: 0; font-size: 15.5px; line-height: 1.42; }
math { font-family: "STIX Two Math", math; }
.thm .stmt math { font-size: 1.12em; }
@media (max-width: 380px) { .thm .stmt { padding: 9px 10px; } .thm .stmt math { font-size: 1em; } }
.thm .where math { font-size: 1.05em; }
.thm footer { display: flex; align-items: center; gap: 10px; padding: 10px 12px 12px; flex-wrap: wrap; }
.thm .trust { font: 500 12.5px/1.35 var(--sans); color: var(--ink-3); flex: 1 1 160px; }
.thm .result { font: 650 14px/1.3 var(--sans); font-stretch: 94%; }
.thm .result.ok { color: var(--ok); } .thm .result.bad { color: var(--bad); }
.thm-more { margin-top: 4px; }
.thm-more summary { cursor: pointer; font: 650 15px/1.3 var(--sans); padding: 10px 0; min-height: 44px; list-style: none; }
.thm-more summary::-webkit-details-marker { display: none; }
.thm-more summary::before { content: "＋ "; color: var(--flip); }
.thm-more[open] summary::before { content: "－ "; }
.checkall { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; margin: 6px 0 10px; }
.bar { height: 6px; border-radius: 3px; background: var(--wash-2); overflow: hidden; flex: 1 1 140px; }
.bar i { display: block; height: 100%; width: 0; background: var(--flip); transition: width 120ms linear; }

/* evidence tags (as on the poster) */
.tag { display: inline-flex; align-items: baseline; gap: 4px; padding: 2px 8px; border-radius: 999px; border: 1.3px solid currentColor; font: 600 12.5px/1.4 var(--sans); white-space: nowrap; }
.tag.lean { color: var(--gold); background: var(--gold-wash); font-family: var(--mono); font-weight: 500; }
.tag.data { color: var(--teal); background: var(--teal-wash); }
.tag.paper { color: var(--ink-2); border-style: dashed; }
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 6px 0 12px; }
.note { border-left: 0; background: var(--wash); border-radius: 12px; padding: 10px 12px; font-size: 15px; color: var(--ink-2); margin: 10px 0 14px; }

/* ── 3D viewer ───────────────────────────────────────────────────────────── */
.viewer { position: relative; width: 100%; aspect-ratio: 4 / 3; border-radius: var(--radius); background: var(--wash); overflow: hidden; touch-action: pan-y; }
.viewer canvas { width: 100% !important; height: 100% !important; display: block; }
.viewer .hint { position: absolute; left: 10px; bottom: 8px; font: 500 12px/1 var(--sans); color: var(--ink-3); pointer-events: none; }

/* ── bottom navigation ───────────────────────────────────────────────────── */
.bottom {
  position: fixed; inset: auto 0 0 0; z-index: 20; height: calc(var(--bottom-h) + env(safe-area-inset-bottom));
  padding: 10px max(12px, env(safe-area-inset-left)) calc(10px + env(safe-area-inset-bottom));
  display: flex; align-items: center; gap: 10px; background: color-mix(in srgb, var(--paper) 97%, transparent);
  border-top: 1px solid var(--rule);
}
.nav-btn { min-width: 48px; min-height: 48px; border-radius: 14px; border: 1px solid var(--rule); background: var(--paper); cursor: pointer; font: 700 18px/1 var(--sans); }
.nav-btn.next { flex: 0 1 auto; display: inline-flex; align-items: center; gap: 8px; padding: 0 16px; background: var(--ink); color: var(--paper); border-color: var(--ink); font-size: 15.5px; max-width: 46vw; }
.next-label { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-weight: 650; font-stretch: 92%; }
.nav-btn:disabled { opacity: 0.35; cursor: default; }
.dots { list-style: none; margin: 0; padding: 0; display: flex; gap: 5px; flex: 1 1 auto; justify-content: center; }
.dots button { width: 12px; height: 28px; border: 0; background: transparent; padding: 0; cursor: pointer; display: grid; place-items: center; }
.dots button::before { content: ""; width: 8px; height: 8px; border-radius: 2px; background: var(--rule); transition: transform 160ms; }
.dots button[aria-current="step"]::before { background: var(--flip); transform: scale(1.35); }
.dots button.done::before { background: var(--ink-3); }

.toast { position: fixed; left: 50%; transform: translateX(-50%); bottom: calc(var(--bottom-h) + 14px + env(safe-area-inset-bottom)); z-index: 30;
  background: var(--ink); color: var(--paper); padding: 10px 14px; border-radius: 12px; font: 600 14.5px/1.3 var(--sans); max-width: min(92vw, 520px); box-shadow: var(--shadow); }
.loading { display: flex; gap: 10px; align-items: center; font: 600 15px/1.3 var(--sans); color: var(--ink-2); padding: 18px 0; }
.spinner { width: 18px; height: 18px; border-radius: 50%; border: 2.5px solid var(--rule); border-top-color: var(--flip); animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.error { border: 1px solid var(--bad); color: var(--bad); border-radius: 12px; padding: 12px; font: 600 15px/1.4 var(--sans); background: color-mix(in srgb, var(--bad) 8%, transparent); }
.noscript { padding: 20px; font: 600 16px/1.4 sans-serif; }

@media (min-width: 900px) {
  body { font-size: 18px; }
  main { padding-top: 28px; }
  .hook { font-size: 22px; }
  .bottom { justify-content: center; }
  .dots { flex: 0 1 auto; margin: 0 20px; }
}

/* nucleotide colours (letters are always printed on the marks) */
:root { --n-A: #008300; --n-C: #2a78d6; --n-G: #4a3aa7; --n-T: #e34948; }

/* ── chapter furniture ───────────────────────────────────────────────────── */
.next-step { margin: 28px 0 8px; padding-top: 16px; border-top: 1px solid var(--rule); }
.next-step .btn { width: 100%; justify-content: center; }
.lede { font-family: var(--serif); font-size: 18px; line-height: 1.5; color: var(--ink); }
.eq { font: 500 16px/1.5 var(--mono); background: var(--paper); border: 1px solid var(--rule); border-radius: 10px; padding: 8px 12px; overflow-x: auto; white-space: nowrap; }
.legend { display: flex; flex-wrap: wrap; gap: 6px 12px; font: 500 13px/1.2 var(--sans); color: var(--ink-2); margin-top: 10px; }
.legend i { display: inline-block; width: 12px; height: 12px; border-radius: 3px; margin-right: 5px; vertical-align: -1px; }
.legend i.ring { background: transparent !important; border: 2.5px solid; }
.codebook { display: grid; gap: 6px; margin: 10px 0; }
.codebook .grp { display: flex; flex-wrap: wrap; gap: 6px; align-items: center; }
.codebook .gname { font: 600 12.5px/1.2 var(--sans); color: var(--ink-2); width: 100%; margin-top: 4px; }
.cw { display: inline-flex; align-items: center; gap: 6px; border: 1px solid var(--rule); border-radius: 8px; padding: 3px 7px 3px 3px; background: var(--paper); font: 500 13px/1 var(--mono); cursor: pointer; }
.cw b { display: inline-grid; place-items: center; width: 22px; height: 22px; border-radius: 5px; font: 700 13px/1 var(--mono); }
.cw[aria-pressed="true"] { border-color: var(--flip); box-shadow: 0 0 0 2px var(--flip); }
.bitbox { display: inline-flex; gap: 3px; }
.bitbox span { display: inline-grid; place-items: center; width: 26px; height: 30px; border-radius: 6px; background: var(--paper); border: 1px solid var(--rule); font: 600 16px/1 var(--mono); transition: background 160ms, color 160ms, transform 160ms; }
.bitbox span.one { background: var(--ink); color: var(--paper); border-color: var(--ink); }
.bitbox span.flip { background: var(--flip); color: #fff; border-color: var(--flip); transform: translateY(-2px); }
.bitbox.tap span { cursor: pointer; min-width: 34px; height: 38px; }
.cmp { display: grid; grid-template-columns: auto 1fr; gap: 8px 12px; align-items: center; }
.cmp .lab { font: 600 13.5px/1.2 var(--sans); color: var(--ink-2); }
.cmp .cnt { font: 600 13px/1.2 var(--sans); color: var(--ink-3); grid-column: 2; margin-top: -4px; }
.checks { list-style: none; padding: 0; margin: 8px 0; display: grid; gap: 6px; }
.checks li { position: relative; padding-left: 24px; font-size: 15.5px; line-height: 1.4; overflow-wrap: anywhere; }
.checks li::before { content: "✓"; position: absolute; left: 2px; top: 0; font-weight: 800; color: var(--ok); }
.checks li .tag { margin: 2px 2px 0 0; vertical-align: 1px; }
.checks li.bad::before { content: "✗"; color: var(--bad); }
.checks li.wait::before { content: "…"; color: var(--ink-3); }
.rounds { font: 500 13.5px/1.5 var(--mono); color: var(--ink-2); min-height: 3em; }
.rounds b { color: var(--ink); }
.blocks-list { display: grid; gap: 6px; margin: 8px 0; }
.blocks-list button { display: flex; gap: 10px; align-items: center; text-align: left; border: 1px solid var(--rule); background: var(--paper); border-radius: 10px; padding: 8px 10px; min-height: 44px; cursor: pointer; font: 500 14.5px/1.3 var(--sans); color: var(--ink); }
.blocks-list button i { width: 14px; height: 14px; border-radius: 3px; flex: none; }
.blocks-list button[aria-pressed="true"] { border-color: var(--flip); box-shadow: 0 0 0 2px var(--flip); }
.perm { position: relative; margin: 6px 0; }
.perm .cell { position: absolute; display: grid; place-items: center; border-radius: 5px; font: 600 12px/1 var(--mono); transition: left 900ms cubic-bezier(.5,0,.2,1), top 900ms cubic-bezier(.5,0,.2,1); }
.perm .axl { position: absolute; font: 500 11px/1 var(--mono); color: var(--ink-3); display: grid; place-items: center; transition: left 900ms cubic-bezier(.5,0,.2,1), top 900ms cubic-bezier(.5,0,.2,1); }
.kv { display: grid; grid-template-columns: auto 1fr; gap: 4px 12px; font-size: 15px; margin: 8px 0; }
.kv dt { color: var(--ink-2); } .kv dd { margin: 0; font-weight: 600; }
.takeaway { border: 1px solid var(--rule); border-radius: var(--radius); padding: 12px 14px; background: var(--paper); margin: 10px 0; }
.takeaway h3 { margin-top: 0; }
.scrollx { overflow-x: auto; -webkit-overflow-scrolling: touch; }
@media (prefers-reduced-motion: reduce) { .perm .cell, .perm .axl, .bitbox span { transition: none; } }
.chains button[aria-pressed="true"] .small { color: inherit; opacity: 0.78; }

main:focus, main:focus-visible { outline: none; }
.dots { gap: 3px; }
.dots button { width: 11px; }
sup { font-size: 0.7em; line-height: 0; }
.dots { gap: 2px; }
.dots button { width: 10px; }
@media (max-width: 400px) { .dots button { width: 8px; } .dots button::before { width: 6px; height: 6px; } }

/* ── data tables ─────────────────────────────────────────────────────────── */
.datatable { margin: 10px 0 16px; }
.datatable input[type="search"] { margin-bottom: 8px; }
.datatable table { width: 100%; border-collapse: collapse; font: 500 14px/1.3 var(--sans); font-variant-numeric: tabular-nums; }
.datatable caption { text-align: left; font: 500 13px/1.3 var(--sans); color: var(--ink-2); padding-bottom: 6px; }
.datatable th { text-align: left; border-bottom: 1.5px solid var(--ink); padding: 0; white-space: nowrap; }
.datatable th button { border: 0; background: none; font: 700 13px/1.2 var(--sans); color: var(--ink); padding: 8px 6px; min-height: 40px; cursor: pointer; width: 100%; text-align: inherit; }
.datatable th.num, .datatable td.num { text-align: right; }
.datatable td { border-bottom: 1px solid var(--rule); padding: 6px; white-space: nowrap; }
.datatable td .btn.small { min-height: 32px; padding: 4px 10px; font-size: 13px; }
.datatable tr:hover td { background: var(--wash); }
.table-pager { justify-content: space-between; margin-top: 6px; }
.tt { font: 500 13.5px/1.5 var(--mono); }
.tt td, .tt th { padding: 3px 8px; }
.tt tr.on td { background: var(--teal-wash); }
.tt tr.sel td { background: var(--flip-wash); box-shadow: inset 0 2px var(--flip), inset 0 -2px var(--flip); }

/* ── home: the chapters as a flow ────────────────────────────────────────── */
.flow { list-style: none; margin: 0 0 18px; padding: 0; display: flex; flex-wrap: wrap; gap: 6px 4px; align-items: center; }
.flow li { display: inline-flex; align-items: center; }
.flow li + li::before { content: "→"; color: var(--ink-3); margin: 0 4px 0 2px; font: 600 14px var(--sans); }
.flow button { border: 1px solid var(--rule); background: var(--paper); border-radius: 999px; padding: 5px 10px; min-height: 34px; font: 600 13.5px/1 var(--sans); color: var(--ink); cursor: pointer; }
.flow button .mono { color: var(--ink-3); font-size: 11.5px; }
.flow li:nth-child(n+6):nth-child(-n+9) button { border-color: var(--teal); background: var(--teal-wash); }

/* ── feedback card (home page, takeaways) ── */
.feedback { display: grid; grid-template-columns: 1fr auto; grid-template-areas: "text qr" "form form"; gap: 12px 22px;
  margin: 28px 0 12px; padding: 16px; border: 1px solid var(--rule); border-radius: var(--radius); background: var(--paper); box-shadow: var(--shadow); }
.feedback .fb-text { grid-area: text; min-width: 0; }
.feedback .fb-text h2 { margin: 2px 0 6px; }
.feedback .fb-text p { margin: 0 0 12px; font-size: 15.5px; color: var(--ink-2); }
.feedback .fb-kicker { font: 650 12.5px/1 var(--sans); letter-spacing: .06em; text-transform: uppercase; color: var(--flip); }
.feedback .fb-link { font-size: 13.5px; color: var(--ink-2); word-break: break-all; }
.feedback .fb-qr { grid-area: qr; margin: 0; text-align: center; align-self: start; }
.feedback .fb-qr-svg { display: block; width: 156px; height: 156px; padding: 6px; background: #FFFFFF; border-radius: 12px; border: 1px solid var(--rule); }
.feedback .fb-qr-svg svg { display: block; width: 100%; height: 100%; }
.feedback .fb-qr figcaption { font: 500 12.5px/1.3 var(--sans); color: var(--ink-3); margin-top: 6px; }
.feedback .fb-frame, .feedback .fb-details { grid-area: form; min-width: 0; }
/* heights measured from the form itself: it needs ~1,240 px at 640 px and wider, ~1,400 at 530 px,
   ~1,530 at 330 px and ~1,570 at 300 px (narrow screens stack the 1–5 scale) */
.feedback .fb-frame iframe { display: block; width: 100%; height: 1290px; border: 0; border-radius: 12px; background: #FFFFFF; }
@media (max-width: 760px) { .feedback .fb-frame iframe { height: 1440px; } }
.feedback .fb-details summary { cursor: pointer; font: 650 15px/1.3 var(--sans); padding: 10px 0; min-height: 44px; list-style: none; color: var(--ink); }
.feedback .fb-details summary::-webkit-details-marker { display: none; }
.feedback .fb-details summary::before { content: "＋ "; color: var(--flip); }
.feedback .fb-details[open] summary::before { content: "－ "; }
@media (max-width: 560px) {
  .feedback { grid-template-columns: 1fr; grid-template-areas: "text" "qr" "form"; padding: 14px 12px; }
  .feedback .fb-qr-svg { width: 132px; height: 132px; margin: 0 auto; }
  .feedback .fb-frame iframe { height: 1560px; }
}
@media (max-width: 380px) { .feedback .fb-frame iframe { height: 1700px; } }