/* Note Duel. Concert-programme paper, ink, and two duelling colours. */
:root {
  --bg: #f5f0e6;
  --surface: #fffcf5;
  --surface-2: #efe7d7;
  --ink: #1c1a16;
  --ink-2: #3a362f;
  --muted: #6d655a;
  --line: #e2d8c4;
  --a: #d9481f;
  --a-soft: #fbe2d7;
  --b: #147a82;
  --b-soft: #d3ecec;
  --gold: #e3aa17;
  --good: #2f7d4f;
  --bad: #b3261e;
  --left: #5b57c9;
  --right: #c98a0b;
  /* The listening stage and the reveal card stay dark in both themes: lit notes need a dark ground. */
  --stage: #15161b;
  --stage-2: #1e1f26;
  --stage-ink: #ece6da;
  --stage-muted: #9d978c;
  --stage-line: #2c2d35;
  --stage-a: #ff7a52;
  --stage-b: #4cc2c6;
  --stage-gold: #f0bd3a;
  --shadow: 0 1px 2px rgba(40, 30, 10, 0.06), 0 8px 24px -12px rgba(40, 30, 10, 0.18);
  --radius: 18px;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", "URW Palladio L", "P052", Georgia, serif;
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  --mono: ui-monospace, "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #13120f;
    --surface: #1c1a16;
    --surface-2: #28251f;
    --ink: #f3ede1;
    --ink-2: #d6cfc1;
    --muted: #a39a8b;
    --line: #37332b;
    --a: #ff7a52;
    --a-soft: #3b2019;
    --b: #4cc2c6;
    --b-soft: #15302f;
    --gold: #f0bd3a;
    --good: #6cc48f;
    --bad: #ff8a80;
    --left: #9d9af0;
    --right: #f0b640;
    --stage: #0d0e12;
    --stage-2: #17181e;
    --stage-line: #25262d;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.3), 0 10px 30px -14px rgba(0, 0, 0, 0.6);
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font: 16px/1.55 var(--sans);
  color: var(--ink);
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { width: 100%; max-width: 1240px; margin: 0 auto; padding: 1.5rem 1.25rem 3rem; flex: 1; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.15; letter-spacing: -0.01em; }
h1 { font-size: clamp(2rem, 4.4vw, 3.2rem); margin: 0.25rem 0 0.5rem; }
h1 em, .brand em { font-style: italic; }
h2 { font-size: 1.6rem; margin: 0 0 0.75rem; }
h3 { font-size: 1.2rem; margin: 0 0 0.35rem; }
p { margin: 0 0 0.75rem; }
small { font-size: 0.8em; }
kbd {
  font: 0.75rem/1 var(--mono);
  padding: 0.2rem 0.4rem;
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 6px;
  background: var(--surface);
  color: var(--ink-2);
}
:focus-visible { outline: 3px solid var(--gold); outline-offset: 2px; }

.kicker {
  display: block;
  font: 600 0.75rem/1.2 var(--sans);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 0.4rem;
}
.lede { font-size: 1.15rem; color: var(--ink-2); max-width: 38rem; }
.meta, .small, .hint, .fineprint { color: var(--muted); }
.small, .fineprint { font-size: 0.875rem; }
.section-title { margin-top: 2.75rem; }

/* ---- header / footer ---------------------------------------------------- */
header.site {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.7rem max(1.25rem, calc((100% - 1240px) / 2 + 1.25rem));
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 0.5rem; text-decoration: none; font: 600 1.35rem/1 var(--serif); }
.brand-mark { width: 30px; height: 30px; }
header.site nav { display: flex; gap: 0.25rem; }
header.site nav a {
  text-decoration: none;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  color: var(--ink-2);
  font-weight: 500;
}
header.site nav a:hover { background: var(--surface-2); }
header.site nav a.active { background: var(--ink); color: var(--bg); }
.pilot-tag {
  margin-left: auto;
  font-size: 0.78rem;
  color: var(--muted);
  border: 1px dashed var(--line);
  border-radius: 999px;
  padding: 0.2rem 0.65rem;
  white-space: nowrap;
}
footer.site {
  border-top: 1px solid var(--line);
  padding: 1.25rem max(1.25rem, calc((100% - 1240px) / 2 + 1.25rem));
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2rem;
  justify-content: space-between;
  color: var(--muted);
  font-size: 0.875rem;
}
footer.site p { margin: 0; }

/* ---- buttons ------------------------------------------------------------ */
button { font: inherit; color: inherit; cursor: pointer; }
button:disabled { cursor: default; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  justify-content: center;
  padding: 0.6rem 1.1rem;
  border-radius: 999px;
  border: 1.5px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.12s ease, box-shadow 0.12s ease, background 0.12s ease;
}
.btn:hover:not(:disabled) { transform: translateY(-1px); box-shadow: var(--shadow); }
.btn:active:not(:disabled) { transform: translateY(0); }
.btn:disabled { opacity: 0.45; }
.btn-primary { background: var(--ink); color: var(--bg); }
.btn-ghost { border-color: var(--line); background: var(--surface); }
.btn-lg { padding: 0.85rem 1.5rem; font-size: 1.05rem; }
button.linklike { border: 0; background: none; color: var(--muted); text-decoration: underline; padding: 0; }
button.linklike:hover { color: var(--ink); }

.chip {
  display: inline-grid;
  place-items: center;
  width: 1.6em;
  height: 1.6em;
  border-radius: 50%;
  color: #fff;
  font: 700 0.85em/1 var(--serif);
  vertical-align: 0.05em;
}
.chip-a { background: var(--a); }
.chip-b { background: var(--b); }
.nowrap { white-space: nowrap; }

.notice {
  background: color-mix(in srgb, var(--gold) 14%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--gold) 45%, var(--line));
  border-radius: 12px;
  padding: 0.65rem 0.9rem;
  font-size: 0.925rem;
}
.error-box {
  border: 1px solid var(--bad);
  background: color-mix(in srgb, var(--bad) 10%, var(--surface));
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
}

/* ---- landing ------------------------------------------------------------ */
.hero {
  display: grid;
  grid-template-columns: 1.25fr 1fr;
  gap: 2rem;
  align-items: center;
  padding: 2.5rem 0 1.5rem;
}
.cta-row { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 1.5rem 0 0.75rem; }
.hint { font-size: 0.9rem; }
.hero-art { position: relative; height: 260px; display: flex; align-items: center; justify-content: center; }
.staff-deco { position: absolute; inset: 50% 0 auto; transform: translateY(-50%); width: 100%; height: 90px; z-index: 0; }
.staff-deco line { stroke: var(--line); stroke-width: 2; }
.disc {
  position: relative;
  z-index: 1;
  width: 150px;
  height: 150px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: #fff;
  font: italic 600 5rem/1 var(--serif);
  box-shadow: var(--shadow);
  animation: bob 5s ease-in-out infinite;
}
.disc-a { background: var(--a); transform: rotate(-6deg); }
.disc-b { background: var(--b); transform: rotate(6deg); animation-delay: -2.5s; }
.vs {
  position: relative;
  z-index: 2;
  margin: 0 -18px;
  width: 58px;
  height: 58px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--ink);
  color: var(--bg);
  font: italic 700 1.3rem/1 var(--serif);
  border: 4px solid var(--bg);
}
@keyframes bob { 50% { translate: 0 -8px; } }

.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0.75rem; }
.stat {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.1rem;
  display: flex;
  flex-direction: column;
}
.stat-n { font: 600 2.1rem/1.1 var(--serif); font-variant-numeric: tabular-nums; }
.stat-n small { color: var(--muted); font-size: 1.1rem; }
.stat-l { color: var(--muted); font-size: 0.875rem; }

.how { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.75rem; }
.how li { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem 1.2rem; }
.how p { color: var(--ink-2); margin: 0; font-size: 0.95rem; }
.how-n {
  display: inline-grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  border-radius: 50%;
  background: var(--ink);
  color: var(--bg);
  font: 700 0.95rem/1 var(--serif);
  margin-bottom: 0.6rem;
}

.duel-title { font: 600 1.25rem/1.2 var(--serif); }
.duel-go { font-weight: 600; margin-top: 0.4rem; }
.section-sub { margin: -0.5rem 0 1rem; max-width: 60ch; }
.brief-list { list-style: none; padding: 0; margin: 0 0 1rem; display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr)); gap: 0.75rem; }
.brief-pick {
  display: grid;
  gap: 0.3rem;
  height: 100%;
  box-sizing: border-box;
  text-decoration: none;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem 1.2rem;
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}
.brief-pick:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.brief-summary { color: var(--ink-2); font-size: 0.925rem; }
.brief-progress { display: flex; align-items: center; gap: 0.6rem; margin-top: 0.3rem; }
.bp-bar { flex: 1; height: 6px; border-radius: 3px; background: var(--surface-2); overflow: hidden; }
.bp-bar > span { display: block; height: 100%; background: var(--ink); border-radius: 3px; }
.is-done .bp-bar > span { background: var(--good); }
.bp-n { font-size: 0.8rem; color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
.brief-pick .duel-go { align-self: end; }
.brief-pick.is-done .duel-go { color: var(--good); }

.method-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem 2rem; }
.method-grid > div { border-top: 2px solid var(--ink); padding-top: 0.75rem; }
.method-grid p { color: var(--ink-2); font-size: 0.95rem; margin: 0; }

/* ---- duel page ---------------------------------------------------------- */
.brief-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.3fr);
  gap: 0.5rem 2rem;
  align-items: start;
}
.brief-card h1 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); }
.brief-card .fineprint { grid-column: 1 / -1; margin: 0; }
.meta-chips { list-style: none; padding: 0; margin: 0.5rem 0 0; display: flex; flex-wrap: wrap; gap: 0.35rem; }
.meta-chips li { background: var(--surface-2); border-radius: 999px; padding: 0.15rem 0.65rem; font-size: 0.85rem; }
.brief-more > summary { display: none; }
.prompt {
  margin: 0;
  padding: 0.9rem 1.1rem;
  border-left: 3px solid var(--gold);
  background: var(--bg);
  border-radius: 0 12px 12px 0;
  font: italic 1.05rem/1.55 var(--serif);
}

.stepper { list-style: none; padding: 0; margin: 1.5rem 0 1rem; display: flex; align-items: center; }
.stepper li { display: flex; align-items: center; gap: 0.5rem; color: var(--muted); flex: 1; font-weight: 500; font-size: 0.925rem; }
.stepper li:not(:last-child)::after { content: ""; flex: 1; height: 2px; background: var(--line); margin: 0 0.75rem; border-radius: 2px; }
.stepper li.done:not(:last-child)::after { background: var(--ink); }
.stepper li:last-child { flex: 0 0 auto; }
.stepper .dot {
  width: 2rem;
  height: 2rem;
  flex: none;
  border-radius: 50%;
  display: grid;
  place-items: center;
  border: 2px solid var(--line);
  background: var(--surface);
  font: 700 0.9rem/1 var(--serif);
  transition: background 0.2s, border-color 0.2s, color 0.2s;
}
.stepper li.current { color: var(--ink); }
.stepper li.current .dot { border-color: var(--ink); box-shadow: 0 0 0 4px color-mix(in srgb, var(--gold) 35%, transparent); }
.stepper li.done { color: var(--ink); }
.stepper li.done .dot { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.stepper li[data-step="A"].done .dot { background: var(--a); border-color: var(--a); color: #fff; }
.stepper li[data-step="B"].done .dot { background: var(--b); border-color: var(--b); color: #fff; }

.listen-bar { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.75rem 1.5rem; margin-bottom: 1rem; }
#skip[hidden] { display: none; }
.listen-controls { display: flex; flex-wrap: wrap; align-items: center; gap: 0.6rem 0.75rem; }
.now-playing { font-weight: 600; font-variant-numeric: tabular-nums; }
.now-playing:empty { display: none; }
.now-playing .np-badge { display: inline-grid; place-items: center; width: 1.6rem; height: 1.6rem; margin-right: 0.35rem; border-radius: 50%; color: #fff; font: 700 0.85rem/1 var(--serif); }
.now-playing .np-a { background: var(--a); }
.now-playing .np-b { background: var(--b); }
/* While a piece plays, keep the transport (and Skip) in reach under the site header. */
body.is-playing .listen-bar {
  position: sticky;
  top: var(--header-h, 3.5rem);
  z-index: 15;
  padding: 0.6rem 0.75rem;
  margin-inline: -0.75rem;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.listen-bar .keys { margin: 0; color: var(--muted); font-size: 0.85rem; }
#play-both.is-playing { background: var(--gold); border-color: var(--gold); color: #1c1a16; }
/* A finished and the browser wants a tap before B can start. */
#play-both.is-handoff { background: var(--gold); border-color: var(--gold); color: #1c1a16; animation: nudge 1.6s ease-in-out infinite; }
@keyframes nudge { 50% { box-shadow: 0 0 0 7px color-mix(in srgb, var(--gold) 30%, transparent); } }
.pb-icon { font-size: 0.85em; }

/* The listening stage: both pieces on one dark panel, stacked so each score gets the full width. */
.listen-area { margin-bottom: 2rem; }
.sides {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1.25rem;
  background: var(--stage);
  color: var(--stage-ink);
  border-radius: calc(var(--radius) + 4px);
  padding: 1.1rem 1.1rem 1.25rem;
}
.side-a { --side: var(--stage-a); --side-page: var(--a); }
.side-b { --side: var(--stage-b); --side-page: var(--b); }
.side { min-width: 0; }
.side + .side { border-top: 1px solid var(--stage-line); padding-top: 1.1rem; }
.pager { display: none; }
.nd-defs { position: absolute; width: 0; height: 0; overflow: hidden; }
.side-head { display: flex; align-items: center; gap: 0.75rem; }
.badge {
  width: 2.6rem;
  height: 2.6rem;
  flex: none;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--side);
  color: var(--stage);
  font: italic 700 1.4rem/1 var(--serif);
}
.side.playing .badge { box-shadow: 0 0 0 4px color-mix(in srgb, var(--side) 30%, transparent); }
/* Handoff from A to B: B's header pulses once so the eye lands on it. */
.side.cue .badge { animation: cue 1.1s ease-out; }
.side.cue .side-title h2 { animation: rise 0.45s ease both; }
@keyframes cue {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--side) 70%, transparent); transform: scale(1); }
  30% { transform: scale(1.12); }
  100% { box-shadow: 0 0 0 18px color-mix(in srgb, var(--side) 0%, transparent); transform: scale(1); }
}
.side-title { min-width: 0; flex: 1; }
.side-title h2 { margin: 0; font-size: 1.35rem; color: var(--stage-ink); }
.identity { margin: 0.1rem 0 0; font: italic 1rem/1.3 var(--serif); color: var(--side); animation: rise 0.5s ease both; }
.side.picked .badge { box-shadow: 0 0 0 3px var(--stage), 0 0 0 5px var(--stage-gold); }
.heard-pill {
  flex: none;
  font-size: 0.8rem;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  background: var(--stage-2);
  color: var(--stage-muted);
  transition: background 0.2s, color 0.2s;
}
.heard-full .heard-pill { background: color-mix(in srgb, var(--side) 18%, transparent); color: var(--side); }
.heard-full .heard-pill::before { content: "✓ "; }

.transport { display: flex; align-items: center; gap: 0.85rem; margin-top: 1rem; }
.play {
  position: relative;
  flex: none;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  border: 0;
  background: var(--side);
  color: var(--stage);
  display: grid;
  place-items: center;
  transition: transform 0.12s ease, opacity 0.2s;
}
.play:hover:not(:disabled) { transform: scale(1.06); }
.play:disabled { opacity: 0.4; }
.play svg { width: 26px; height: 26px; fill: currentColor; grid-area: 1 / 1; }
.play .i-pause, .playing .play .i-play { display: none; }
.playing .play .i-pause { display: block; }
.playing .play::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid var(--side);
  animation: ring 1.6s ease-out infinite;
}
@keyframes ring { from { opacity: 0.8; transform: scale(1); } to { opacity: 0; transform: scale(1.35); } }
.track { flex: 1; min-width: 0; display: grid; gap: 5px; }
.coverage { width: 100%; height: 6px; display: block; border-radius: 3px; background: var(--stage-2); }
.seek { -webkit-appearance: none; appearance: none; width: 100%; height: 18px; background: transparent; margin: 0; cursor: pointer; }
.seek:disabled { cursor: default; }
.seek::-webkit-slider-runnable-track { height: 4px; border-radius: 2px; background: var(--stage-line); }
.seek::-moz-range-track { height: 4px; border-radius: 2px; background: var(--stage-line); }
.seek::-webkit-slider-thumb { -webkit-appearance: none; width: 16px; height: 16px; margin-top: -6px; border-radius: 50%; background: var(--side); border: 2px solid var(--stage); box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3); }
.seek::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: var(--side); border: 2px solid var(--stage); }
.clock { font: 0.9rem/1 var(--mono); color: var(--stage-muted); font-variant-numeric: tabular-nums; white-space: nowrap; }
.clock .sep { margin: 0 0.2rem; opacity: 0.5; }
.status { margin: 0.4rem 0 0 calc(56px + 0.85rem); color: var(--stage-muted); font-size: 0.85rem; font-variant-numeric: tabular-nums; }
.side-error, .vote-error { color: var(--bad); font-size: 0.9rem; margin: 0.5rem 0 0; }
.side .side-error { color: #ff8a80; }

/* Lit Score: engraved in light ink on the dark stage. Sounding notes glow in the piece's colour
   and fade back to ink; bars start faint and darken as they are heard (opacity set by player.js). */
.score {
  position: relative;
  margin-top: 0.85rem;
  max-height: 70vh;
  overflow-y: auto;
  background: var(--stage-2);
  color: var(--stage-ink);
  border-radius: 12px;
  padding: 0.5rem 0.4rem;
}
.score .loading { color: var(--stage-muted); padding: 2rem; text-align: center; margin: 0; }
.score svg { position: relative; z-index: 1; width: 100%; height: auto; display: block; color: var(--stage-ink); fill: var(--stage-ink); }
.score g.measure { cursor: pointer; transition: opacity 0.6s ease; }
.score g.measure.nd-current { opacity: 1 !important; }
.score rect.nd-measure-bg { fill: transparent; pointer-events: all; transition: fill 0.15s; }
.score g.measure:hover > rect.nd-measure-bg { fill: color-mix(in srgb, var(--side) 10%, transparent); }
.score g.measure.nd-current > rect.nd-measure-bg { fill: rgba(240, 189, 58, 0.07); }
.score g.note { transition: fill 1.6s ease-out, color 1.6s ease-out; }
.score g.note.nd-on { fill: var(--side); color: var(--side); filter: url(#nd-glow); transition: none; }
.nd-beam {
  position: absolute;
  left: 0;
  top: 0;
  z-index: 2;
  width: 3px;
  margin-left: -1.5px;
  border-radius: 3px;
  pointer-events: none;
  background: linear-gradient(rgba(240, 189, 58, 0), var(--stage-gold) 25%, var(--stage-gold) 75%, rgba(240, 189, 58, 0));
  box-shadow: 0 0 16px 3px rgba(240, 189, 58, 0.35);
}
.nd-ring {
  position: absolute;
  z-index: 3;
  width: 12px;
  height: 12px;
  margin: -6px 0 0 -6px;
  border-radius: 50%;
  border: 2px solid var(--side);
  pointer-events: none;
  animation: strike 0.75s ease-out forwards;
}
@keyframes strike { from { transform: scale(0.6); opacity: 0.95; } to { transform: scale(3.4); opacity: 0; } }

/* ---- vote --------------------------------------------------------------- */
.vote {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 4px);
  padding: 1.75rem clamp(1rem, 4vw, 2.5rem);
  box-shadow: var(--shadow);
  max-width: 900px;
  margin: 0 auto;
  scroll-margin-top: 5rem;
}
fieldset { border: 0; padding: 0; margin: 0; min-width: 0; }
.choices legend { font: 600 clamp(1.5rem, 3vw, 2rem)/1.2 var(--serif); text-align: center; width: 100%; margin-bottom: 1.1rem; }
.choices legend .kicker { font-family: var(--sans); }
.choice-grid { display: grid; grid-template-columns: 1fr 0.8fr 1fr; gap: 0.75rem; }
.choice {
  --c: var(--ink);
  --c-soft: var(--surface-2);
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  padding: 1.1rem 0.75rem;
  border: 2px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  user-select: none;
  transition: transform 0.12s ease, border-color 0.15s, background 0.15s;
}
.choice-a { --c: var(--a); --c-soft: var(--a-soft); }
.choice-b { --c: var(--b); --c-soft: var(--b-soft); }
.choice:hover { border-color: var(--c); transform: translateY(-2px); }
.choice input, .pill input, .choice-neither input { position: absolute; opacity: 0; width: 1px; height: 1px; pointer-events: none; }
.c-big { font: italic 700 2.6rem/1 var(--serif); color: var(--c); }
.c-sub { font-size: 0.9rem; color: var(--muted); }
.choice:has(input:checked) { border-color: var(--c); background: var(--c-soft); transform: translateY(-2px) scale(1.02); }
.choice:has(input:checked) .c-sub { color: var(--ink); font-weight: 600; }
.choice:has(input:checked)::after {
  content: "✓";
  position: absolute;
  top: 0.5rem;
  right: 0.6rem;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--c);
  color: var(--surface);
  font-size: 0.8rem;
  font-weight: 700;
  animation: pop 0.25s ease;
}
.choice:has(input:focus-visible), .pill:has(input:focus-visible), .choice-neither:has(input:focus-visible) { outline: 3px solid var(--gold); outline-offset: 2px; }
.choice-neither {
  position: relative;
  display: table;
  margin: 0.85rem auto 0;
  padding: 0.35rem 0.9rem;
  border-radius: 999px;
  border: 1.5px dashed var(--line);
  color: var(--muted);
  font-size: 0.925rem;
  cursor: pointer;
}
.choice-neither:hover { border-color: var(--muted); color: var(--ink); }
.choice-neither:has(input:checked) { border-style: solid; border-color: var(--ink); background: var(--ink); color: var(--bg); }
.choice:has(input:disabled), .choice-neither:has(input:disabled), .pill:has(input:disabled) { cursor: default; transform: none; }

.extras { display: none; grid-template-columns: 1fr; gap: 1rem; margin-top: 1.5rem; padding-top: 1.25rem; border-top: 1px dashed var(--line); }
#vote-form:has(input[name=choice]:checked) .extras { display: grid; animation: rise 0.35s ease both; }
.chips legend { font-weight: 600; margin-bottom: 0.5rem; }
.opt { font-weight: 400; color: var(--muted); font-size: 0.85rem; margin-left: 0.3rem; }
.pill { position: relative; display: inline-block; margin: 0 0.3rem 0.4rem 0; cursor: pointer; }
.pill span {
  display: inline-block;
  padding: 0.35rem 0.85rem;
  border-radius: 999px;
  border: 1.5px solid var(--line);
  background: var(--surface);
  font-size: 0.9rem;
  transition: background 0.12s, color 0.12s, border-color 0.12s;
}
.pill:hover span { border-color: var(--ink-2); }
.pill:has(input:checked) span { background: var(--ink); border-color: var(--ink); color: var(--bg); }
.submit-row { display: flex; flex-wrap: wrap; align-items: center; gap: 0.75rem 1.25rem; margin-top: 1.5rem; }
.submit-row .btn { flex: none; }
.listen-note { margin: 0; flex: 1; min-width: 16rem; color: var(--muted); font-size: 0.875rem; }
.listen-note.is-full { color: var(--good); font-weight: 600; }
.listen-note.is-full::before { content: "✓ "; }

/* ---- reveal ------------------------------------------------------------- */
.reveal { max-width: 1000px; margin: 2.5rem auto 0; scroll-margin-top: 5rem; animation: rise 0.5s ease both; }
.reveal:focus { outline: none; }
.reveal-hero { text-align: center; margin-bottom: 1.25rem; }
.reveal-hero h2 { font-size: clamp(2rem, 4.5vw, 3rem); margin: 0; }
.reveal-sub { color: var(--muted); margin-top: 0.3rem; }
/* Orbits: the two pieces as circles, drawn from what you heard, then named. */
.orbit-card {
  background: var(--stage);
  color: var(--stage-ink);
  border-radius: calc(var(--radius) + 6px);
  padding: 1.1rem 1.25rem 1.25rem;
  display: grid;
  gap: 1rem;
}
.oc-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 0.5rem; }
.oc-title { font: 600 1.3rem/1.2 var(--serif); }
.oc-stamp { font: 600 0.7rem/1 var(--sans); letter-spacing: 0.14em; text-transform: uppercase; color: var(--stage-muted); }
.orbits { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1rem; }
.orb { position: relative; margin: 0; display: grid; justify-items: center; gap: 0.6rem; text-align: center; }
.orb.side-a { --side: var(--stage-a); }
.orb.side-b { --side: var(--stage-b); }
canvas.orbit { display: block; width: 100%; max-width: 320px; aspect-ratio: 1; cursor: pointer; }
.orb .who { display: grid; gap: 0.15rem; opacity: 0; transform: translateY(6px); transition: opacity 0.5s ease, transform 0.5s ease; }
.orbit-card.named .orb .who { opacity: 1; transform: none; }
.orb .who .kicker { color: var(--side); margin: 0; }
.orb .who h3 { font-size: 1.3rem; margin: 0; color: var(--stage-ink); }
.orb .desc { font-size: 0.85rem; color: var(--stage-muted); margin: 0; }
.orb .provenance { font-size: 0.85rem; color: var(--stage-muted); margin: 0; }
.orb .provenance strong { color: var(--stage-ink); }
.orbit-legend { margin: 0; font-size: 0.85rem; color: var(--stage-muted); text-align: center; max-width: 62ch; justify-self: center; }
.ribbon {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  z-index: 1;
  background: var(--stage-gold);
  color: #1b1606;
  font: 700 0.72rem/1 var(--sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
  padding: 0.4rem 0.7rem;
  border-radius: 999px;
}
.reveal-checks { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 0.75rem; margin-top: 0.75rem; }
.reveal-checks .checks-box { background: var(--surface); border: 1px solid var(--line); border-radius: 12px; padding: 0.6rem 0.9rem; }
.provenance { font-size: 0.9rem; color: var(--ink-2); }
.checks-box summary { cursor: pointer; font-size: 0.9rem; color: var(--muted); }
.checks { list-style: none; padding-left: 0; margin: 0; font-size: 0.85rem; }
.checks .pass { color: var(--good); }
.checks .fail { color: var(--bad); }
.crowd { margin-top: 1rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1.1rem 1.25rem; }
.crowd-l { margin: 0.75rem 0 0.35rem; font-size: 0.9rem; }
.reveal-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.75rem; margin-top: 1.5rem; }

.split { display: flex; height: 30px; border-radius: 8px; overflow: hidden; background: var(--surface-2); gap: 2px; }
.split > span {
  display: grid;
  place-items: center;
  min-width: 1.6rem;
  color: #fff;
  font: 700 0.8rem/1 var(--sans);
  font-variant-numeric: tabular-nums;
  animation: grow 0.7s cubic-bezier(0.2, 0.8, 0.2, 1) both;
  transform-origin: left;
}
.split .seg-empty { flex: 1; color: var(--muted); font-weight: 500; animation: none; }
.seg-A, .k-A { background: var(--a); }
.seg-B, .k-B { background: var(--b); }
.seg-left, .k-left { background: var(--left); }
.seg-right, .k-right { background: var(--right); }
.seg-tie, .k-tie { background: #8c8577; }
.seg-neither, .k-neither { background: repeating-linear-gradient(135deg, #5a554c 0 5px, #77716696 5px 10px); }
.legend { font-size: 0.85rem; color: var(--muted); margin: 0.5rem 0 0.25rem; display: flex; flex-wrap: wrap; align-items: center; gap: 0.25rem 0.4rem; }
.legend .k { width: 0.8rem; height: 0.8rem; border-radius: 3px; display: inline-block; margin-left: 0.5rem; }
.legend .k:first-child { margin-left: 0; }

/* ---- generation reliability disclosure --------------------------------- */
.gen-outcomes { margin: 1.25rem 0 1.5rem; }
.gen-outcomes-lede { margin: 0.25rem 0 0.75rem; max-width: 42rem; }
.gen-outcomes-note { margin: 0 0 1rem; }
.gen-totals {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0.75rem 0 1rem;
}
.gen-models { display: grid; gap: 0.35rem; margin-top: 0.5rem; }
.gen-models-row {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) 5.5rem 5.5rem minmax(5.5rem, 0.9fr) minmax(7rem, 0.8fr);
  gap: 0.5rem 1rem;
  align-items: center;
  padding: 0.55rem 0.9rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.gen-models-head {
  background: none;
  border: 0;
  padding: 0 0.9rem;
  font: 600 0.72rem/1 var(--sans);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.gen-models-row .who-title { display: block; font: 600 1rem/1.2 var(--serif); }
.gen-models-row .meta { display: block; font-size: 0.8rem; }
.gen-models-row .num { text-align: right; font-variant-numeric: tabular-nums; }
.gen-fail { color: var(--bad); font-weight: 600; }
.gen-zero { border-style: dashed; opacity: 0.92; }
.gen-why { display: block; font-size: 0.75rem; color: var(--muted); font-weight: 400; }
.gen-status { font-size: 0.85rem; }
.gen-status-eligible { font-weight: 600; }
.not-ranked, .excluded-votes { margin: 0 0 0.75rem; }
.gen-extra-note { margin-top: 0.75rem; }
.gen-extra-note summary { cursor: pointer; }
#reliability { margin-top: 2.5rem; }
.gen-outcomes-lede { max-width: 75ch; }
.unjudged { margin: 0.25rem 0 0; padding: 0 1.2rem; }
.too-early { margin-bottom: 1rem; }
@media (max-width: 640px) {
  .gen-totals { grid-template-columns: 1fr 1fr; }
  .gen-models-row { grid-template-columns: 1fr 3.5rem 3.5rem 4.5rem; }
  .gen-models-row .gen-status { grid-column: 1 / -1; }
}

/* ---- rankings ----------------------------------------------------------- */
.rank-head { display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 1rem; margin: 1.5rem 0 1rem; }
.rank-head .lede { margin: 0; }
.seg { display: inline-flex; padding: 4px; border-radius: 999px; background: var(--surface-2); }
.seg a { text-decoration: none; padding: 0.45rem 1rem; border-radius: 999px; font-weight: 600; font-size: 0.925rem; color: var(--muted); }
.seg a small { font-weight: 500; opacity: 0.75; margin-left: 0.2rem; }
.seg a.on { background: var(--surface); color: var(--ink); box-shadow: var(--shadow); }
.board { margin-top: 1.25rem; display: grid; gap: 0.6rem; }
.board-row {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1.4fr) minmax(0, 2fr) 6.5rem 6.5rem;
  gap: 0.25rem 1.25rem;
  align-items: center;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 0.9rem 1.2rem;
}
.board-labels { background: none; border: 0; padding: 0 1.2rem; font: 600 0.72rem/1 var(--sans); letter-spacing: 0.1em; text-transform: uppercase; color: var(--muted); }
.board-row.is-top { border-color: color-mix(in srgb, var(--gold) 55%, var(--line)); box-shadow: var(--shadow); }
.rank { display: flex; flex-direction: column; align-items: center; gap: 0.15rem; }
.rank-n {
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font: 700 1.3rem/1 var(--serif);
  background: var(--surface-2);
}
.is-top .rank-n { background: var(--gold); color: #1c1a16; }
.rank-range { font-size: 0.72rem; color: var(--muted); font-variant-numeric: tabular-nums; }
.who { display: flex; flex-direction: column; gap: 0.1rem; min-width: 0; }
.who-title { font: 600 1.15rem/1.2 var(--serif); }
.who .meta { font-size: 0.85rem; }
.tag-prov {
  align-self: start;
  margin-top: 0.2rem;
  font: 600 0.68rem/1 var(--sans);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  border: 1px dashed var(--muted);
  border-radius: 999px;
  padding: 0.2rem 0.5rem;
}
.forest { display: grid; gap: 0.25rem; }
.forest-track { position: relative; height: 22px; }
.forest-track::before { content: ""; position: absolute; left: 0; right: 0; top: 50%; height: 1px; background: var(--line); }
.forest-mid { position: absolute; top: 0; bottom: 0; border-left: 1.5px dashed var(--muted); opacity: 0.5; }
.forest-ci { position: absolute; top: 50%; height: 8px; transform: translateY(-50%); border-radius: 4px; background: color-mix(in srgb, var(--ink) 22%, transparent); }
.is-top .forest-ci { background: color-mix(in srgb, var(--gold) 55%, transparent); }
.forest-pt { position: absolute; top: 50%; width: 14px; height: 14px; border-radius: 50%; transform: translate(-50%, -50%); background: var(--ink); border: 2px solid var(--surface); }
.forest-n { font-size: 0.85rem; font-variant-numeric: tabular-nums; }
.forest-n small { color: var(--muted); }
.num { text-align: right; display: flex; flex-direction: column; font-variant-numeric: tabular-nums; }
.num strong { font: 600 1.15rem/1.2 var(--serif); }
.num small { color: var(--muted); }
.board-labels .num { display: block; }
.extra { grid-column: 2 / -1; font-size: 0.8rem; color: var(--muted); }
.extra:empty { display: none; }
.brief-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 380px), 1fr)); gap: 0.75rem; }
.mini-board { list-style: none; padding: 0; margin: 0.5rem 0 0; display: grid; gap: 0.45rem; }
.mini-board li { display: grid; grid-template-columns: 1.5rem minmax(0, 1fr) auto 3.2rem; grid-template-rows: auto 5px; gap: 0.15rem 0.6rem; align-items: center; font-size: 0.9rem; }
.mb-rank { grid-row: 1 / 3; font: 700 1rem/1 var(--serif); color: var(--muted); text-align: center; }
.mb-name { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mb-score { font-variant-numeric: tabular-nums; text-align: right; }
.mb-score small, .mb-n { color: var(--muted); font-size: 0.78rem; font-variant-numeric: tabular-nums; text-align: right; }
.mb-n { grid-row: 1 / 3; grid-column: 4; }
.mb-bar { grid-column: 2 / 4; height: 5px; border-radius: 3px; background: var(--surface-2); overflow: hidden; }
.mb-bar > span { display: block; height: 100%; background: var(--ink); border-radius: 3px; }
.mini-board li:first-child .mb-bar > span { background: var(--gold); }
.h2h { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 1rem 1.2rem; }
.h2h h3 a { text-decoration: none; }
.h2h h3 a:hover { text-decoration: underline; }
.h2h h3 small { font: 400 0.85rem var(--sans); color: var(--muted); margin-left: 0.4rem; }
.h2h-names { display: flex; justify-content: space-between; gap: 1rem; font-size: 0.9rem; font-weight: 600; margin: 0.4rem 0; }
.n-left { color: var(--left); }
.n-right { color: var(--right); text-align: right; }
.empty { text-align: center; padding: 3rem 1rem; background: var(--surface); border: 1px dashed var(--line); border-radius: var(--radius); margin-top: 1rem; }
.empty-big { font: 600 1.6rem/1.2 var(--serif); }
.howread { margin-top: 2rem; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 0.9rem 1.2rem; }
.howread summary { cursor: pointer; font-weight: 600; }
.howread li { margin: 0.4rem 0; color: var(--ink-2); font-size: 0.925rem; }
.cta-center { text-align: center; margin-top: 2rem; }

/* ---- motion ------------------------------------------------------------- */
@keyframes rise { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@keyframes pop { from { transform: scale(0.4); } to { transform: scale(1); } }
@keyframes flip { from { opacity: 0; transform: perspective(800px) rotateX(-35deg) translateY(12px); } to { opacity: 1; transform: none; } }
@keyframes grow { from { transform: scaleX(0); } to { transform: scaleX(1); } }
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
}

/* ---- small screens ------------------------------------------------------ */
@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; padding-top: 1rem; }
  .hero-art { height: 180px; order: -1; }
  .disc { width: 110px; height: 110px; font-size: 3.6rem; }
  .brief-card { grid-template-columns: 1fr; }
  .method-grid, .how { grid-template-columns: 1fr 1fr; }
  .board-row { grid-template-columns: 3rem minmax(0, 1fr) 5rem; grid-template-areas: "rank who win" ". forest forest" ". extra extra"; }
  .board-row .rank { grid-area: rank; align-self: start; }
  .board-row .who { grid-area: who; }
  .board-row .num-win { grid-area: win; align-self: start; }
  .board-row .forest { grid-area: forest; }
  .board-row .extra { grid-area: extra; }
  .board-row .num-judged { display: none; }
  .board-labels { display: none; }
}
@media (max-width: 640px) {
  main { padding: 1rem 1rem 2.5rem; }
  /* The brief text collapses behind "Read the brief"; the fine print goes with it. */
  .brief-more > summary {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    cursor: pointer;
    list-style: none;
    font-weight: 600;
    font-size: 0.925rem;
    padding: 0.35rem 0.8rem;
    border: 1px solid var(--line);
    border-radius: 999px;
    background: var(--surface-2);
  }
  .brief-more > summary::-webkit-details-marker { display: none; }
  .brief-more > summary::after { content: "▾"; font-size: 0.8em; }
  .brief-more[open] > summary::after { content: "▴"; }
  .brief-more[open] > summary { margin-bottom: 0.6rem; }
  .brief-more:not([open]) .bm-hide, .brief-more[open] .bm-show { display: none; }
  .brief-more:not([open]) ~ .fineprint { display: none; }
  /* Collapsed before the script runs too, so the brief never flashes open. */
  .brief-card:not(.js-ready) .brief-more > .prompt,
  .brief-card:not(.js-ready) .fineprint { display: none; }
  .brief-card:not(.js-ready) .brief-more .bm-hide { display: none; }
  .brief-card:not(.js-ready) .brief-more .bm-show { display: inline; }
  /* Keep the headline and "Start a duel" on the first screen. */
  .hero-art { height: 110px; }
  .disc { width: 84px; height: 84px; font-size: 2.8rem; }
  header.site { gap: 0.75rem; padding: 0.6rem 1rem; }
  .brand span { display: none; }
  .pilot-tag { display: none; }
  header.site nav { margin-left: auto; }
  .stats { grid-template-columns: 1fr 1fr; }
  .method-grid, .how { grid-template-columns: 1fr; }
  .stepper .step-l { display: none; }
  .listen-bar .keys { display: none; }
  .listen-controls { width: 100%; }
  #play-both { flex: 1 1 auto; }
  .choice-grid { grid-template-columns: 1fr 1fr; }
  .choice-tie { grid-column: 1 / -1; grid-row: 2; flex-direction: row; justify-content: center; gap: 0.6rem; padding: 0.6rem; }
  .choice-tie .c-big { font-size: 1.6rem; }
  .orbit-card { padding: 0.9rem 0.75rem 1rem; }
  .orbits { gap: 0.5rem; }
  .orb .who h3 { font-size: 1.02rem; }
  .orb .desc { display: none; }
  .ribbon { font-size: 0.62rem; padding: 0.3rem 0.55rem; }
  .reveal-checks { grid-template-columns: 1fr; }
  /* One score at a time; the transport moves to the bottom edge, in thumb reach. */
  .pager { display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem; }
  .pager button {
    border: 1px solid var(--stage-line);
    background: transparent;
    color: var(--stage-muted);
    border-radius: 10px;
    padding: 0.5rem;
    font: 600 1rem/1.2 var(--serif);
  }
  .pager button[aria-pressed="true"] { background: var(--stage-2); color: var(--stage-ink); border-color: var(--stage-muted); }
  .pager-heard { font: 500 0.75rem var(--mono); margin-left: 0.4rem; color: var(--stage-muted); }
  .sides[data-show="A"] > #side-B, .sides[data-show="B"] > #side-A { display: none; }
  .sides[data-show="A"] > #side-A, .sides[data-show="B"] > #side-B { animation: rise 0.35s ease both; }
  .side + .side { border-top: 0; padding-top: 0; }
  .sides { padding: 0.75rem; }
  .listen-area { display: flex; flex-direction: column; }
  .listen-area .sides { order: 1; }
  .listen-bar, body.is-playing .listen-bar {
    order: 2;
    position: sticky;
    top: auto;
    bottom: 0;
    z-index: 15;
    margin: 0 -1rem;
    padding: 0.6rem 1rem calc(0.6rem + env(safe-area-inset-bottom, 0px));
    background: color-mix(in srgb, var(--bg) 94%, transparent);
    backdrop-filter: blur(8px);
    border-top: 1px solid var(--line);
    border-bottom: 0;
  }
  .submit-row .btn { width: 100%; }
}