/* Span — "the plate": a printed theory broadsheet you can play.
   Cream paper, ink pens, engraved type. NSM poster system. */

:root {
  --paper: #f3ece0;
  --paper-2: #eae0cd;
  --paper-3: #e2d6bf;
  --ink: #1a1713;
  --ink-2: #4b4234;
  --ink-3: #756853;
  --rule: #bcac8d;
  --red: #8e1d12;
  --gold: #9c7220;

  --fam: var(--ink);

  --serif: 'Cormorant Garamond', Georgia, serif;
  --sans: 'Archivo', system-ui, sans-serif;
  --mono: 'IBM Plex Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { color-scheme: light; }

body {
  min-height: 100vh;
  overflow-x: clip;
  display: flex;
  flex-direction: column;
  color: var(--ink);
  font-family: var(--sans);
  background-color: var(--paper);
  background-image:
    radial-gradient(1200px 700px at 12% -8%, rgba(255, 255, 255, 0.75), transparent 62%),
    radial-gradient(900px 600px at 105% 108%, rgba(142, 29, 18, 0.055), transparent 60%),
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='220' height='220' filter='url(%23n)' opacity='0.06'/%3E%3C/svg%3E");
}

button { font-family: inherit; color: inherit; background: none; border: none; cursor: pointer; }

::selection { background: rgba(142, 29, 18, 0.16); }

/* ─────────── masthead ─────────── */

.top {
  position: sticky;
  top: 0;
  z-index: 60;
  display: flex;
  align-items: flex-end;
  gap: 22px;
  padding: 14px 34px 0;
  background: linear-gradient(var(--paper) 78%, rgba(243, 236, 224, 0.86));
  backdrop-filter: blur(6px);
  border-bottom: 3px double var(--rule);
}

.brand { display: flex; align-items: center; gap: 13px; padding-bottom: 11px; }
.brand-mark { height: 40px; width: auto; filter: invert(1) brightness(0.15); }
.brand-words { display: flex; flex-direction: column; }
.brand-name {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 34px;
  line-height: 0.95;
  letter-spacing: 0.3em;
  text-indent: 0.3em;
}
.brand-tag {
  font-family: var(--sans);
  font-size: 9.5px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.26em;
  color: var(--ink-3);
  margin-top: 4px;
}

.root-pill {
  font-family: var(--sans);
  font-size: 9.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--ink-3);
  padding-bottom: 13px;
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.root-pill b { font-family: var(--serif); font-size: 30px; letter-spacing: 0; color: var(--red); line-height: 0.8; }

.tabs { margin-left: auto; display: flex; gap: 4px; }
.tab {
  font-family: var(--sans);
  font-size: 11.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink-3);
  padding: 12px 17px;
  border-bottom: 3px solid transparent;
  margin-bottom: -3px;
  transition: color 0.18s, border-color 0.18s;
}
.tab:hover { color: var(--ink); }
.tab.active { color: var(--ink); border-bottom-color: var(--red); }

/* ─────────── layout ─────────── */

main { flex: 1; width: min(1500px, 100%); margin: 0 auto; padding: 26px 34px 46px; }

.view { display: none; }
.view.active { display: block; animation: rise 0.3s cubic-bezier(0.22, 1, 0.36, 1); }

@keyframes rise {
  from { opacity: 0; transform: translateY(9px); }
  to { opacity: 1; transform: none; }
}

.panel { position: relative; }

.panel h3, .lab-head h3 {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--ink-2);
}

.hint {
  font-family: var(--serif);
  font-size: 15px;
  font-style: italic;
  color: var(--ink-3);
  margin-top: 3px;
  line-height: 1.35;
}

/* ─────────── interval index (the spine) ─────────── */

.iv-rail {
  display: grid;
  grid-template-columns: repeat(13, 1fr);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  margin-bottom: 26px;
}

.iv-chip {
  --fam: var(--ink);
  min-width: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  padding: 11px 3px 10px;
  border-left: 1px solid var(--rule);
  border-bottom: 3px solid transparent;
  margin-bottom: -1px;
  transition: background 0.16s, border-color 0.16s;
}
.iv-chip:first-child { border-left: none; }
.iv-chip:hover { background: rgba(255, 255, 255, 0.5); }
.iv-chip.active { background: rgba(255, 255, 255, 0.72); border-bottom-color: var(--fam); }
.iv-chip.bonus .chip-short { opacity: 0.55; }
.iv-chip.bonus.active .chip-short { opacity: 1; }

.chip-short {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 22px;
  line-height: 1;
  color: var(--fam);
}
.chip-label {
  font-family: var(--sans);
  font-size: 8.5px;
  font-weight: 600;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--ink-3);
  white-space: nowrap;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
}
.iv-chip.active .chip-label { color: var(--ink-2); }

/* ─────────── the plate ─────────── */

.codex-grid {
  display: grid;
  grid-template-columns: 336px 1fr 350px;
  gap: 0;
}

.codex-grid > .panel { padding: 0 26px; }
.codex-grid > .panel + .panel { border-left: 1px solid var(--rule); }
.circle-wrap { padding-left: 0 !important; }
.iv-card { padding-right: 0 !important; }

/* circle */

.circle-wrap #circlePanel { margin-top: 6px; }
.circle-svg { width: 100%; height: auto; overflow: visible; }
.circle-svg .ring-guide { fill: none; stroke: var(--rule); stroke-width: 1; stroke-dasharray: 2 6; }
.circle-svg .cnode { cursor: pointer; }
.circle-svg .cnode circle {
  fill: var(--paper);
  stroke: var(--ink-3);
  stroke-width: 1;
  transition: fill 0.16s, stroke 0.16s, stroke-width 0.16s;
}
.circle-svg .cnode:hover circle { stroke: var(--ink); stroke-width: 1.8; }
.circle-svg .cnode text {
  fill: var(--ink);
  font-family: var(--serif);
  font-weight: 700;
  font-size: 19px;
  text-anchor: middle;
  pointer-events: none;
}
.circle-svg .cnode.is-root circle { fill: var(--red); stroke: var(--red); }
.circle-svg .cnode.is-root text { fill: var(--paper); }
.circle-svg .cnode.is-target circle { fill: var(--lit, var(--ink)); stroke: var(--lit, var(--ink)); }
.circle-svg .cnode.is-target text { fill: var(--paper); }
.circle-svg .hop-path { fill: none; stroke: var(--lit, var(--ink)); stroke-width: 2.4; opacity: 0.92; }
.circle-svg marker path { fill: var(--ink); }
.circle-svg .core-rule { stroke: var(--rule); stroke-width: 1; }
.circle-svg .core-move {
  fill: var(--ink);
  font-family: var(--serif);
  font-weight: 700;
  font-size: 27px;
  text-anchor: middle;
}
.circle-svg .core-steps {
  fill: var(--ink-2);
  font-family: var(--mono);
  font-size: 10.5px;
  text-anchor: middle;
}
.circle-svg .core-legend {
  fill: var(--ink-3);
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-anchor: middle;
}

/* piano */

.piano-wrap { width: 100%; margin-top: 2px; }
.piano-svg { width: 100%; height: auto; display: block; overflow: visible; }
.piano-svg .pk.white { fill: #fdfaf3; stroke: var(--ink); stroke-width: 1.1; }
.piano-svg .pk.black { fill: #211d18; stroke: var(--ink); stroke-width: 1.1; }
.piano-svg.clickable .pk { cursor: pointer; }
.piano-svg.clickable .pk.white:hover { fill: #fff; }
.piano-svg.clickable .pk.black:hover { fill: #35302a; }
.piano-svg .pk.lit-root { fill: var(--red); }
.piano-svg .pk.lit-target { fill: var(--lit, var(--ink)); }
.piano-svg .pk.lit-ghost {
  fill: color-mix(in srgb, var(--lit, var(--gold)) 26%, #fdfaf3);
  stroke: var(--lit, var(--gold));
  stroke-width: 2;
  stroke-dasharray: 5 3;
}
.piano-svg .pk.lit-wrong { fill: var(--red) !important; }
.badge-on-key circle { fill: var(--paper); stroke: var(--ink); stroke-width: 1.2; }
.badge-on-key text {
  fill: var(--ink);
  font-size: 13px;
  font-weight: 700;
  text-anchor: middle;
  font-family: var(--serif);
  pointer-events: none;
}
.span-arc { fill: none; stroke: var(--lit); stroke-width: 1.6; stroke-dasharray: 5 4; }
.span-arc-label rect { fill: var(--paper); stroke: var(--lit); stroke-width: 1.2; }
.span-arc-label text {
  fill: var(--ink);
  font-size: 11px;
  font-family: var(--mono);
  text-anchor: middle;
}

/* plate labels — the engraver's caption under each figure */

.plate-label {
  display: block;
  font-family: var(--sans);
  font-size: 8.5px;
  font-weight: 700;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 9px;
}

/* staff — engraved straight onto the paper */

.staff-row { display: flex; gap: 22px; margin-top: 20px; align-items: flex-start; flex-wrap: wrap; }
.staff-col { flex: 1; min-width: 250px; }
.staff-box { width: 100%; }
.staff-box svg { display: block; margin: 0 auto; overflow: visible; max-width: 100%; height: auto; }
.staff-controls { display: flex; flex-direction: column; gap: 7px; min-width: 186px; }

.sel {
  background: transparent;
  color: var(--ink);
  border: none;
  border-bottom: 1px solid var(--rule);
  border-radius: 0;
  padding: 6px 2px;
  font-family: var(--mono);
  font-size: 12px;
  width: 100%;
  cursor: pointer;
  transition: border-color 0.16s;
}
.sel:hover, .sel:focus { border-bottom-color: var(--ink); outline: none; }
.sel-label {
  display: flex;
  align-items: baseline;
  gap: 9px;
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-3);
}

/* ─────────── the entry (right column) ─────────── */

.iv-card { display: flex; flex-direction: column; gap: 0; }

.iv-head { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.iv-big {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 46px;
  line-height: 0.9;
  color: var(--fam);
}
.iv-head h2 { font-family: var(--serif); font-size: 30px; font-weight: 600; line-height: 1; }
.iv-alias {
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: block;
  margin-top: 4px;
}

.iv-notes {
  display: flex;
  align-items: baseline;
  gap: 11px;
  flex-wrap: wrap;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 38px;
  line-height: 1;
  padding: 16px 0;
  margin-top: 12px;
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.iv-notes .arrow { color: var(--fam); font-size: 26px; }
.iv-semis {
  font-family: var(--mono);
  font-size: 10.5px;
  font-weight: 400;
  color: var(--ink-3);
  letter-spacing: 0.05em;
  margin-left: auto;
}

/* the working-out ladder — his margin arithmetic, drawn */
.iv-ladder {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 13px 0;
  border-bottom: 1px solid var(--rule);
  font-family: var(--mono);
  font-size: 11px;
  color: var(--ink-2);
  flex-wrap: wrap;
}
.rung {
  display: inline-flex;
  align-items: baseline;
  gap: 5px;
  padding: 4px 9px;
  border: 1px solid var(--rule);
  background: rgba(255, 255, 255, 0.5);
}
.rung.anchor { border-color: var(--gold); color: var(--gold); }
.rung.dest { border-color: var(--fam); color: var(--fam); font-weight: 600; }
.rung em { font-style: normal; font-size: 9px; letter-spacing: 0.12em; text-transform: uppercase; opacity: 0.7; }
.ladder-op { color: var(--ink-3); font-size: 13px; }

.iv-trick, .iv-practice {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.45;
  color: var(--ink);
  padding: 14px 0 14px 16px;
  border-left: 1.5px solid var(--fam);
  margin: 14px 0 0;
}
.iv-practice { font-size: 16px; color: var(--ink-2); border-left-color: var(--rule); margin-top: 0; }
.tag {
  display: block;
  font-family: var(--sans);
  font-size: 8.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  color: var(--fam);
  margin-bottom: 3px;
}
.iv-practice .tag { color: var(--ink-3); }

.iv-pills { display: flex; gap: 7px; flex-wrap: wrap; margin-top: 16px; }
.pill {
  font-family: var(--mono);
  font-size: 10.5px;
  padding: 6px 11px;
  border: 1px solid var(--rule);
  color: var(--ink-2);
  background: rgba(255, 255, 255, 0.45);
  transition: all 0.15s;
}
.pill.sargam { color: var(--gold); border-color: color-mix(in srgb, var(--gold) 45%, var(--rule)); }
.pill.flip:hover { border-color: var(--fam); color: var(--fam); background: #fff; }

.iv-songs {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin-top: 16px;
  font-family: var(--serif);
  font-size: 16px;
  font-style: italic;
  color: var(--ink-2);
}

.iv-play { display: flex; gap: 7px; margin-top: 18px; }

.play-btn {
  flex: 1;
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 11px 12px;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  transition: background 0.15s, color 0.15s;
}
.play-btn:hover { background: var(--ink); color: var(--paper); }
.play-btn.wide {
  flex: none;
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  text-align: left;
}
.play-btn.wide:hover .dim-text { color: var(--paper); }

/* ─────────── labs ─────────── */

.labs-row {
  display: grid;
  grid-template-columns: 1.35fr 1fr 0.95fr;
  gap: 0;
  margin-top: 34px;
  padding-top: 26px;
  border-top: 3px double var(--rule);
}
.labs-row > .panel { padding: 0 26px; }
.labs-row > .panel:first-child { padding-left: 0; }
.labs-row > .panel:last-child { padding-right: 0; }
.labs-row > .panel + .panel { border-left: 1px solid var(--rule); }

.lab-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.lab .lab-body { margin-top: 16px; display: flex; flex-direction: column; gap: 11px; }

.thirds-toggle { display: flex; gap: 2px; }
.thirds-toggle button {
  font-family: var(--mono);
  font-size: 12px;
  padding: 4px 11px;
  border: 1px solid var(--rule);
  color: var(--ink-3);
  transition: all 0.15s;
}
.thirds-toggle button.active { background: var(--ink); border-color: var(--ink); color: var(--paper); }

.shape-row { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.shape-name {
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  min-width: 104px;
}
.shape-name em { font-style: normal; font-family: var(--serif); font-size: 15px; color: var(--red); letter-spacing: 0; }
.shape-chips { display: flex; gap: 5px; flex-wrap: wrap; }

.note-chip {
  --fam: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  padding: 6px 9px;
  border: 1px solid var(--rule);
  background: rgba(255, 255, 255, 0.5);
  transition: all 0.14s;
}
.note-chip:hover { border-color: var(--fam); color: var(--fam); background: #fff; }
.note-chip.tt { font-size: 13px; padding: 8px 12px; }

.scale-gym { gap: 9px; }
.gym-note { font-family: var(--serif); font-size: 15px; line-height: 1.5; color: var(--ink-2); margin-top: 4px; }
.dim-text { font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.06em; color: var(--ink-3); text-transform: none; }

/* ─────────── drills ─────────── */

.drill-top {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  padding: 0 0 16px;
  border-bottom: 1px solid var(--rule);
}

.drill-presets { display: flex; gap: 4px; }
.preset {
  font-family: var(--sans);
  font-size: 9.5px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 7px 12px;
  border: 1px solid var(--ink-3);
  color: var(--ink);
  transition: all 0.15s;
}
.preset:hover { background: var(--ink); border-color: var(--ink); color: var(--paper); }

.drill-ivs { display: flex; gap: 4px; flex-wrap: wrap; }
.mini-chip {
  --fam: var(--ink);
  font-family: var(--mono);
  font-size: 11.5px;
  padding: 5px 8px;
  border: 1px solid var(--rule);
  color: var(--ink-3);
  opacity: 0.8;
  transition: all 0.14s;
}
.mini-chip:hover { opacity: 1; border-color: var(--ink-2); }
.mini-chip.on { opacity: 1; color: var(--paper); background: var(--fam); border-color: var(--fam); }

.drill-opts { display: flex; gap: 12px; align-items: center; margin-left: auto; flex-wrap: wrap; }
.opt {
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-2);
  display: flex;
  gap: 5px;
  align-items: center;
  cursor: pointer;
}
.opt input { accent-color: var(--red); }
.drill-opts .sel { width: auto; }

.drill-stage {
  margin-top: 34px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

/* the engraved plate that holds the question */
.plate {
  position: relative;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--rule);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.8) inset, 0 6px 22px rgba(26, 23, 19, 0.06);
  padding: 26px 34px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  width: fit-content;
  max-width: 100%;
  margin: 0 auto;
}
.plate::before, .plate::after {
  content: '';
  position: absolute;
  left: 9px;
  right: 9px;
  height: 1px;
  background: var(--rule);
  opacity: 0.5;
}
.plate::before { top: 9px; }
.plate::after { bottom: 9px; }
.plate-keys { padding: 22px 26px; width: 100%; align-self: stretch; align-items: stretch; }
.plate-keys > div { width: 100%; }
.plate-ear { padding: 34px 60px; gap: 16px; }
.ear-mode {
  font-family: var(--serif);
  font-style: italic;
  font-size: 20px;
  color: var(--ink-2);
}
.ear-hint {
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.ear-hint b { color: var(--ink); }

.hands-hint {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  font-family: var(--serif);
  font-style: italic;
  font-size: 17px;
  color: var(--ink-2);
  margin-top: 4px;
}
.hands-hint b { font-style: normal; font-weight: 600; color: var(--ink); }
.plate .staff-box { max-width: none; }

.drill-prompt {
  display: flex;
  align-items: center;
  gap: 16px;
  font-family: var(--serif);
  font-size: 25px;
  flex-wrap: wrap;
  justify-content: center;
  text-align: center;
}
.drill-prompt .q-iv { --fam: var(--ink); color: var(--fam); font-weight: 700; }

.big-play {
  width: 62px;
  height: 62px;
  border-radius: 50%;
  border: 1.5px solid var(--ink);
  color: var(--ink);
  font-size: 19px;
  transition: background 0.16s, color 0.16s, transform 0.16s;
}
.big-play:hover { background: var(--ink); color: var(--paper); transform: scale(1.05); }

.drill-visual { width: min(900px, 100%); }
.drill-visual .staff-box { max-width: 340px; margin: 0 auto; }

.drill-answers { display: flex; gap: 6px; flex-wrap: wrap; justify-content: center; max-width: 760px; }
.ans {
  --fam: var(--ink);
  font-family: var(--serif);
  font-weight: 700;
  font-size: 25px;
  padding: 12px 24px;
  border: 1px solid var(--ink-3);
  background: rgba(255, 255, 255, 0.55);
  transition: all 0.13s;
}
.ans b { font-family: var(--mono); color: var(--ink-3); font-size: 9px; font-weight: 400; margin-right: 6px; vertical-align: 3px; }
.ans:hover { border-color: var(--fam); color: var(--fam); background: #fff; transform: translateY(-2px); }
.ans.right { background: var(--fam); border-color: var(--fam); color: var(--paper); }
.ans.right b { color: rgba(255, 255, 255, 0.65); }
.ans.wrong { border-color: var(--red); color: var(--red); text-decoration: line-through; }
.ans.dim { opacity: 0.3; }

.drill-feedback { min-height: 22px; text-align: center; }
.drill-feedback.show { animation: rise 0.25s ease; display: flex; flex-direction: column; gap: 9px; align-items: center; }
.fb-line { font-family: var(--serif); font-size: 22px; }
.fb-line b { font-weight: 700; }
.drill-feedback.ok .fb-line b { color: #2f6b34; }
.drill-feedback.no .fb-line b { color: var(--red); }
.fb-trick {
  --fam: var(--ink);
  font-family: var(--serif);
  font-size: 17px;
  font-style: italic;
  color: var(--ink-2);
  border-left: 1.5px solid var(--fam);
  padding-left: 13px;
  max-width: 560px;
  text-align: left;
}
.fb-song { font-family: var(--mono); font-size: 11px; color: var(--ink-3); }

.drill-foot {
  display: flex;
  align-items: center;
  gap: 18px;
  margin-top: 30px;
  padding-top: 16px;
  border-top: 1px solid var(--rule);
  flex-wrap: wrap;
}
.drill-streak {
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: flex;
  align-items: baseline;
  gap: 7px;
}
.drill-streak b { font-family: var(--serif); font-size: 26px; color: var(--red); letter-spacing: 0; }

.drill-heat { display: flex; gap: 3px; flex-wrap: wrap; }
.heat {
  font-family: var(--mono);
  font-size: 10px;
  padding: 4px 6px;
  border: 1px solid var(--rule);
  color: var(--ink-3);
}
.heat.hot { background: #2f6b34; border-color: #2f6b34; color: var(--paper); }
.heat.warm { background: var(--gold); border-color: var(--gold); color: var(--paper); }
.heat.cold { background: var(--red); border-color: var(--red); color: var(--paper); }

.drill-next {
  margin-left: auto;
  font-family: var(--sans);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  padding: 11px 20px;
  border: 1px solid var(--ink);
  transition: background 0.15s, color 0.15s;
}
.drill-next:hover { background: var(--ink); color: var(--paper); }

/* ─────────── voice ─────────── */

.voice-status { display: flex; justify-content: center; padding: 20px 0; }
.voice-intro {
  text-align: center;
  font-family: var(--serif);
  font-size: 25px;
  line-height: 1.45;
  gap: 22px;
  padding: 36px 56px;
}
.voice-intro .plate-label { margin-bottom: 0; }
.voice-intro .play-btn { flex: none; padding: 14px 34px; }
.voice-intro .dim-text { font-size: 14px; font-family: var(--serif); font-style: italic; text-transform: none; letter-spacing: 0; }

.voice-steps {
  display: flex;
  gap: 26px;
  flex-wrap: wrap;
  justify-content: center;
  font-family: var(--sans);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-2);
  text-transform: none;
  max-width: 720px;
}
.voice-steps span { display: flex; align-items: baseline; gap: 7px; }
.voice-steps em {
  font-family: var(--serif);
  font-style: normal;
  font-weight: 700;
  font-size: 17px;
  color: var(--red);
}

.play-btn.primary { background: var(--ink); color: var(--paper); }
.play-btn.primary:hover { background: var(--red); border-color: var(--red); }

.voice-meter { width: min(580px, 94%); margin: 4px auto; }
.meter-track {
  position: relative;
  height: 52px;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid var(--rule);
  overflow: hidden;
}
.meter-center {
  position: absolute;
  left: 50%;
  top: 0;
  bottom: 0;
  width: 13%;
  transform: translateX(-50%);
  background: rgba(47, 107, 52, 0.12);
  border-left: 1px dashed rgba(47, 107, 52, 0.6);
  border-right: 1px dashed rgba(47, 107, 52, 0.6);
}
.meter-needle {
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 50%;
  width: 3px;
  background: var(--ink-3);
  transform: translateX(-50%);
  transition: left 0.09s linear;
  opacity: 0.3;
}
.meter-needle.live { background: var(--red); opacity: 1; }
.voice-meter.in-tune .meter-needle.live { background: #2f6b34; box-shadow: 0 0 0 3px rgba(47, 107, 52, 0.18); }
.meter-scale {
  display: flex;
  justify-content: space-between;
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-top: 7px;
}

.voice-heard { font-family: var(--mono); font-size: 12.5px; color: var(--ink-2); text-align: center; }

.v-target-hide { filter: blur(7px); transition: filter 0.25s; font-style: normal; color: var(--red); }
.v-target-hide.shown { filter: none; }

.ghost-btn {
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  border-bottom: 1px solid var(--rule);
  padding: 3px 1px;
  transition: color 0.15s, border-color 0.15s;
}
.ghost-btn:hover { color: var(--ink); border-bottom-color: var(--ink); }

/* ─────────── footer ─────────── */

.foot {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 22px 34px;
  border-top: 3px double var(--rule);
  color: var(--ink-3);
  font-size: 13px;
  flex-wrap: wrap;
}
.foot-logo { height: 34px; width: auto; filter: invert(1) brightness(0.18); }
.foot-words { display: flex; flex-direction: column; gap: 2px; font-family: var(--serif); font-size: 16px; color: var(--ink-2); }
.foot-words b { color: var(--ink); }
.foot-words a { color: var(--red); text-decoration: none; border-bottom: 1px solid rgba(142, 29, 18, 0.35); font-size: 14px; }
.foot-words a:hover { border-bottom-color: var(--red); }
.foot-year {
  margin-left: auto;
  font-family: var(--sans);
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

/* ─────────── responsive ─────────── */

@media (max-width: 1240px) {
  .codex-grid { grid-template-columns: 1fr 1fr; }
  .center-wrap { grid-column: 1 / -1; padding: 0 0 24px !important; border-left: none !important; }
  .circle-wrap { order: 2; padding-top: 24px !important; border-top: 1px solid var(--rule); }
  .iv-card { order: 3; padding: 24px 0 0 26px !important; border-top: 1px solid var(--rule); }
  .labs-row { grid-template-columns: 1fr; gap: 26px; }
  .labs-row > .panel { padding: 0 !important; border-left: none !important; }
  .labs-row > .panel + .panel { padding-top: 26px !important; border-top: 1px solid var(--rule); }
  .iv-rail { grid-template-columns: repeat(7, 1fr); }
  .iv-chip:nth-child(8) { border-left: none; }
}

@media (max-width: 760px) {
  .top { flex-wrap: wrap; gap: 8px; padding: 12px 16px 0; }
  .brand-name { font-size: 27px; }
  .brand-mark { height: 32px; }
  .root-pill { padding-bottom: 11px; }
  .tabs {
    margin-left: 0;
    width: 100%;
    max-width: 100%;
    justify-content: space-between;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .tabs::-webkit-scrollbar { display: none; }
  .tab { padding: 10px 6px; font-size: 9.5px; letter-spacing: 0.08em; flex: 1 0 auto; }
  main { padding: 18px 16px 32px; }
  .foot { padding: 18px 16px; }
  .codex-grid { grid-template-columns: 1fr; }
  .iv-card { padding-left: 0 !important; }
  .iv-rail { grid-template-columns: repeat(4, 1fr); }
  .iv-chip:nth-child(4n + 1) { border-left: none; }
  .chip-short { font-size: 19px; }
  .chip-label { font-size: 7.5px; letter-spacing: 0.06em; }
  .iv-notes { font-size: 30px; }
  .drill-prompt { font-size: 20px; }
  .drill-top { gap: 12px; }
  .drill-opts { margin-left: 0; }
  .plate, .plate-ear { padding: 20px 18px; }
  .voice-intro { padding: 26px 20px; font-size: 21px; }
  .staff-controls { min-width: 0; width: 100%; }
  .labs-row { margin-top: 26px; }
}