/* =========================================================================
   fretwise · foundation
   Visual system: clean + worn advanced-tech.
   Light = warm rebel-base / desert outpost.
   Dark  = cool console / amber readouts.
   ========================================================================= */

:root {
  /* type */
  --f-display: "Space Grotesk", system-ui, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, monospace;

  /* sizing */
  --rad-sm: 2px;
  --rad-md: 4px;
  --rad-lg: 6px;

  /* okabe-ito (slightly tuned for surface harmony) */
  --c-root: #d35400;   /* vermillion-ish */
  --c-3rd:  #2078b4;
  --c-5th:  #1b9270;
  --c-7th:  #e0a020;
  --c-other: var(--ink-3);
}

/* ----- LIGHT (default) — cool steel-paper / rebel console daylight ----- */
:root, [data-theme="light"] {
  --bg:        oklch(0.95 0.008 230);
  --bg-2:      oklch(0.975 0.006 230);
  --surface:   oklch(0.99 0.005 230);
  --surface-2: oklch(0.92 0.010 228);
  --ink:       oklch(0.22 0.018 240);
  --ink-2:     oklch(0.38 0.016 240);
  --ink-3:     oklch(0.55 0.012 240);
  --ink-4:     oklch(0.72 0.010 240);
  --rule:      oklch(0.86 0.010 230);
  --rule-2:    oklch(0.76 0.012 230);
  --accent:    oklch(0.62 0.16 48);   /* burnt orange — warm against cool field */
  --accent-ink: oklch(0.985 0.005 230);
  --grain-opacity: 0.32;
  --vignette: radial-gradient(120% 80% at 50% -10%, transparent 55%, oklch(0.84 0.020 230 / 0.30) 100%);
}

/* ----- DARK — charcoal console at night, amber readouts ----- */
[data-theme="dark"] {
  --bg:        oklch(0.26 0.008 235);
  --bg-2:      oklch(0.30 0.008 235);
  --surface:   oklch(0.33 0.008 235);
  --surface-2: oklch(0.38 0.009 235);
  --ink:       oklch(0.96 0.008 230);
  --ink-2:     oklch(0.82 0.008 230);
  --ink-3:     oklch(0.64 0.008 230);
  --ink-4:     oklch(0.50 0.008 230);
  --rule:      oklch(0.40 0.008 235);
  --rule-2:    oklch(0.50 0.010 235);
  --accent:    oklch(0.80 0.13 72);   /* console amber */
  --accent-ink: oklch(0.22 0.008 235);
  --grain-opacity: 0.22;
  --vignette: radial-gradient(120% 80% at 50% 110%, transparent 60%, oklch(0.18 0.010 235 / 0.55) 100%);
}

/* ----- Base ----- */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--f-display);
  font-feature-settings: "ss01", "cv11";
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

#root { min-height: 100vh; }

/* ----- Layered worn-tech background ----- */
.shell {
  position: relative;
  min-height: 100vh;
  isolation: isolate;
}
.shell::before {
  /* edge falloff */
  content: "";
  position: fixed; inset: 0;
  background: var(--vignette);
  pointer-events: none;
  z-index: 0;
}
.shell::after {
  /* film grain */
  content: "";
  position: fixed; inset: 0;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent 0 3px,
      oklch(0 0 0 / 0.012) 3px 4px
    );
  filter: url(#grain);
  opacity: var(--grain-opacity);
  pointer-events: none;
  mix-blend-mode: multiply;
  z-index: 1;
}
[data-theme="dark"] .shell::after {
  mix-blend-mode: overlay;
  background-image:
    repeating-linear-gradient(
      0deg,
      transparent 0 3px,
      oklch(1 0 0 / 0.018) 3px 4px
    );
}

.frame {
  position: relative;
  z-index: 2;
  max-width: 1240px;
  margin: 0 auto;
  padding: 22px 28px 28px;
}

/* ===== Top bar ===== */
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
}
.brand {
  display: flex; align-items: baseline; gap: 10px;
}
.brand .mark {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: 18px;
  letter-spacing: -0.01em;
}
.brand .tag {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.topbar-right {
  display: flex; align-items: center; gap: 10px;
}

/* mono mini-labels with index brackets */
.idx {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.idx::before { content: "// "; color: var(--ink-4); }

/* ===== Mode + small toggle buttons ===== */
.iconbtn {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--rad-md);
  padding: 6px 10px;
  cursor: pointer;
  transition: background .15s ease, color .15s ease, border-color .15s ease;
  display: inline-flex; align-items: center; gap: 8px;
}
.iconbtn:hover { border-color: var(--rule-2); color: var(--ink); }
.iconbtn[aria-pressed="true"] {
  background: var(--ink);
  color: var(--bg);
  border-color: var(--ink);
}
.iconbtn .glyph { font-size: 12px; }

/* ===== Hero ===== */
.hero {
  position: relative;
  padding: 40px 24px 30px;
  text-align: center;
}
.hero-eyebrow {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin-bottom: 14px;
  display: inline-flex; align-items: center; gap: 10px;
}
.hero-eyebrow .tick {
  width: 18px; height: 1px; background: var(--rule-2);
}

.tonic-display {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 18px;
  padding: 18px 36px 22px;
}
.tonic-letter {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: clamp(110px, 18vw, 184px);
  line-height: 0.85;
  letter-spacing: -0.04em;
  color: var(--ink);
}
.tonic-accidental {
  font-weight: 300;
  color: var(--accent);
  margin-left: -0.06em;
}
.tonic-scale {
  font-family: var(--f-display);
  font-weight: 300;
  font-size: clamp(22px, 3vw, 36px);
  letter-spacing: -0.005em;
  color: var(--ink-2);
}
.tonic-scale::before {
  content: "·";
  margin-right: 0.5em;
  color: var(--ink-4);
}

/* reticle corners */
.reticle {
  position: absolute;
  width: 18px; height: 18px;
  border: 1.5px solid var(--accent);
  opacity: 0.85;
}
.reticle.tl { top: 0; left: 0; border-right: none; border-bottom: none; }
.reticle.tr { top: 0; right: 0; border-left: none; border-bottom: none; }
.reticle.bl { bottom: 0; left: 0; border-right: none; border-top: none; }
.reticle.br { bottom: 0; right: 0; border-left: none; border-top: none; }

/* tonic chips row — soft rounded pills matching the scale row */
.tonic-row {
  margin-top: 22px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px;
}
.tonic-cell {
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--ink-2);
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 7px 14px;
  cursor: pointer;
  position: relative;
  transition: all .15s;
}
.tonic-cell:hover { border-color: var(--rule-2); color: var(--ink); }
.tonic-cell .accidental {
  color: var(--ink-3);
  font-weight: 400;
  margin-left: 1px;
}
.tonic-cell[aria-selected="true"] {
  color: var(--bg);
  background: var(--ink);
  border-color: var(--ink);
}
.tonic-cell[aria-selected="true"] .accidental { color: var(--bg); opacity: 0.7; }
.tonic-cell .idx-num { display: none; }

/* scale row */
.scale-row {
  margin-top: 18px;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px;
}
.scale-chip {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
  color: var(--ink-2);
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 999px;
  padding: 7px 13px;
  cursor: pointer;
  transition: all .15s;
}
.scale-chip:hover { border-color: var(--rule-2); color: var(--ink); }
.scale-chip[aria-selected="true"] {
  color: var(--bg);
  background: var(--ink);
  border-color: var(--ink);
}

/* ===== Key Card (Stage 2 F1) ===== */
.keycard {
  margin-top: 28px;
  display: grid;
  grid-template-columns: minmax(0, 1.7fr) minmax(140px, 1fr) minmax(140px, 1fr);
  border: 1px solid var(--rule);
  border-radius: var(--rad-lg);
  background: var(--surface);
  overflow: hidden;
}
.keycard-notes {
  padding: 16px 20px 18px;
  border-right: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  min-width: 0;
}
.lbl {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-3);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.lbl::before { content: "//"; color: var(--ink-4); margin-right: 4px; }
.lbl-tag {
  letter-spacing: 0.12em;
  color: var(--ink-4);
}
.notes-grid {
  display: flex;
  gap: 4px;
  margin-top: 10px;
  flex-wrap: wrap;
  flex: 1;
  align-content: center;
}
.note-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  border: 1px solid var(--rule);
  border-radius: var(--rad-md);
  padding: 5px 9px 6px;
  background: var(--bg-2);
  min-width: 42px;
  transition: background .15s, border-color .15s;
}
.note-cell .degree {
  font-family: var(--f-mono);
  font-size: 9.5px;
  color: var(--ink-4);
  letter-spacing: 0.04em;
}
.note-cell .note {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 17px;
  color: var(--ink);
  margin-top: 1px;
  line-height: 1;
}
.note-cell[data-role="root"] { border-color: var(--c-root); border-width: 1.5px; }
.note-cell[data-role="root"] .note { color: var(--c-root); font-weight: 600; }
.note-cell[data-role="t3"]   { border-color: var(--c-3rd); }
.note-cell[data-role="t3"] .note  { color: var(--c-3rd); }
.note-cell[data-role="t5"]   { border-color: var(--c-5th); }
.note-cell[data-role="t5"] .note  { color: var(--c-5th); }
.note-cell[data-role="t7"]   { border-color: var(--c-7th); }
.note-cell[data-role="t7"] .note  { color: var(--c-7th); }

.keycard-cell {
  padding: 14px 18px 16px;
  border-right: 1px solid var(--rule);
  display: flex;
  flex-direction: column;
  min-height: 104px;
  background: transparent;
  font: inherit;
  text-align: left;
  color: inherit;
}
.keycard-cell:last-child { border-right: none; }
button.keycard-cell.clickable {
  border-top: none; border-bottom: none; border-left: none;
  cursor: pointer;
  transition: background .15s;
}
button.keycard-cell.clickable:hover {
  background: var(--bg-2);
}
button.keycard-cell.clickable:hover .sub-cta {
  color: var(--accent);
}
.keycard .val {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 22px;
  color: var(--ink);
  margin-top: 8px;
  letter-spacing: -0.005em;
}
.keycard .sub {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--ink-4);
  margin-top: auto;
  padding-top: 10px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
}
.sub-cta { color: var(--ink-3); }
.sig-glyphs {
  font-family: var(--f-display);
  font-weight: 300;
  font-size: 30px;
  margin-top: 8px;
  line-height: 1;
  display: inline-flex;
  gap: 3px;
  color: var(--accent);
}
.sig-glyph { display: inline-block; }
.sig-natural { color: var(--ink-3); }
@media (max-width: 760px) {
  .keycard { grid-template-columns: 1fr; }
  .keycard-notes { border-right: none; border-bottom: 1px solid var(--rule); }
  .keycard-cell { border-right: none; border-bottom: 1px solid var(--rule); }
  .keycard-cell:last-child { border-bottom: none; }
}

/* ===== Fretboard panel ===== */
.panel {
  position: relative;
  margin-top: 28px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--rad-lg);
}
.panel-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule);
}
.panel-title {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.panel-title b { color: var(--ink); font-weight: 600; }
.panel-controls { display: flex; gap: 6px; }
.panel-body { padding: 18px 14px 14px; }

/* segmented mini-control */
.seg {
  display: inline-flex;
  border: 1px solid var(--rule);
  border-radius: var(--rad-md);
  overflow: hidden;
}
.seg button {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
  background: transparent;
  border: none;
  border-right: 1px solid var(--rule);
  padding: 5px 9px;
  cursor: pointer;
}
.seg button:last-child { border-right: none; }
.seg button:hover { color: var(--ink); background: var(--bg-2); }
.seg button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--bg);
}

/* note legend */
.legend {
  display: flex; flex-wrap: wrap; gap: 14px;
  padding: 10px 16px;
  border-top: 1px solid var(--rule);
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--ink-3);
}
.legend .item { display: inline-flex; align-items: center; gap: 6px; }
.swatch { width: 12px; height: 12px; border: 1px solid var(--ink); border-radius: 50%; display: inline-block; }
.swatch.root { border-radius: var(--rad-sm); background: var(--c-root); }
.swatch.t3 { background: var(--c-3rd); }
.swatch.t5 { background: var(--c-5th); }
.swatch.t7 { background: var(--c-7th); }
.swatch.n { background: var(--surface); }

/* =========================================================================
   CAGED row — sits between the fretboard's panel-head and the SVG body.
   ========================================================================= */
.caged-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  border-bottom: 1px dashed var(--rule);
  flex-wrap: wrap;
}
.caged-row-lbl {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.caged-seg button {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 13px;
  letter-spacing: 0.04em;
  min-width: 34px;
  padding: 5px 10px;
  text-transform: none;
}
.caged-seg button:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.caged-row-note {
  color: var(--ink-4);
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.06em;
}

/* ===== Footer status bar ===== */
.status {
  margin-top: 20px;
  display: flex; justify-content: space-between; flex-wrap: wrap;
  gap: 14px;
  padding-top: 14px;
  border-top: 1px solid var(--rule);
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-3);
}
.status .group { display: inline-flex; gap: 16px; }
.status b { color: var(--ink-2); font-weight: 600; }
.status .codex-mark {
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.18em;
}

/* ===== Stage hint row (placeholder for next stages) ===== */
.hints {
  margin-top: 22px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}
.hint {
  position: relative;
  padding: 14px 16px 16px;
  border: 1px dashed var(--rule-2);
  border-radius: var(--rad-md);
  background: var(--bg-2);
}
.hint .num {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--ink-4);
}
.hint .label {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 16px;
  margin-top: 4px;
  color: var(--ink-2);
}
.hint .desc {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--ink-3);
  margin-top: 6px;
  letter-spacing: 0.06em;
}

/* ===== responsive ===== */
@media (max-width: 760px) {
  .frame { padding: 16px 14px 20px; }
  .hints { grid-template-columns: 1fr; }
}

/* =========================================================================
   STAGE 2 · F2 — Diatonic Harmony
   ========================================================================= */
.harmony {
  position: relative;
  margin-top: 22px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--rad-lg);
}
.harmony .panel-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--rule);
  gap: 12px;
}
.harmony .panel-controls { display: flex; gap: 6px; align-items: center; }

.chord-row {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 1px;
  background: var(--rule);
  border-bottom: 1px solid var(--rule);
}
.chord-card {
  position: relative;
  background: var(--surface);
  border: none;
  padding: 14px 12px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  cursor: pointer;
  text-align: left;
  font: inherit;
  color: inherit;
  transition: background .15s ease;
}
.chord-card:hover { background: var(--bg-2); }
.chord-card.active {
  background: var(--bg-2);
}
.chord-card.active::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: 0;
  height: 2px;
  background: var(--accent);
}
.chord-roman {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 24px;
  line-height: 1;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.chord-card.active .chord-roman { color: var(--accent); }
.chord-name {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--ink-2);
  letter-spacing: 0.02em;
}
.chord-notes {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  margin-top: 2px;
}
.chord-note {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--ink-3);
  padding: 2px 5px;
  border: 1px solid var(--rule);
  border-radius: var(--rad-sm);
  background: var(--bg);
  letter-spacing: 0.02em;
}
.chord-note.role-root { color: var(--c-root); border-color: var(--c-root); }
.chord-note.role-t3   { color: var(--c-3rd);  border-color: var(--c-3rd); }
.chord-note.role-t5   { color: var(--c-5th);  border-color: var(--c-5th); }
.chord-note.role-t7   { color: var(--c-7th);  border-color: var(--c-7th); }
.chord-fn {
  margin-top: auto;
  padding-top: 6px;
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.chord-fn[data-fn="T"]  { color: var(--ink-3); }
.chord-fn[data-fn="D"]  { color: var(--accent); opacity: 0.85; }
.chord-fn[data-fn="PD"] { color: var(--ink-3); }
.chord-fn::before { content: "// "; color: var(--ink-4); }

.progressions {
  padding: 14px 16px 16px;
}
.prog-label {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 12px;
  margin-bottom: 10px;
  flex-wrap: wrap;
}
.prog-hint {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--ink-4);
  letter-spacing: 0.04em;
}
.prog-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 8px;
}
.prog-card {
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: var(--rad-md);
  padding: 10px 12px 12px;
  display: flex; flex-direction: column; gap: 6px;
}
.prog-title {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 14px;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.prog-note {
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.prog-chords {
  display: flex; align-items: center; gap: 4px; flex-wrap: wrap;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--ink-2);
  margin-top: 2px;
}
.prog-chip {
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: 3px 9px;
  border-radius: 999px;
  font: inherit;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--ink-2);
  cursor: pointer;
  transition: border-color .15s, color .15s, background .15s;
}
.prog-chip:hover { border-color: var(--rule-2); color: var(--ink); }
.prog-chip.active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--bg);
}
.prog-arrow { color: var(--ink-4); }

.empty-state {
  padding: 28px 18px;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  background: var(--bg-2);
}
.empty-hand {
  font-family: var(--f-display);
  font-weight: 300;
  font-size: 36px;
  color: var(--ink-4);
  line-height: 1;
}
.empty-msg {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--ink-3);
  text-align: center;
  line-height: 1.55;
  max-width: 520px;
}

.focus-tag {
  margin-left: 10px;
  color: var(--ink-4);
  font-weight: 400;
  letter-spacing: 0.16em;
}
.focus-tag b { color: var(--accent); font-weight: 600; }

.linkbtn {
  background: none; border: none; padding: 0;
  color: var(--accent);
  font: inherit;
  text-decoration: underline;
  cursor: pointer;
  letter-spacing: inherit;
}
.linkbtn:hover { color: var(--ink); }

@media (max-width: 900px) {
  .chord-row { grid-template-columns: repeat(7, minmax(112px, 1fr)); overflow-x: auto; }
}
@media (max-width: 600px) {
  .chord-roman { font-size: 20px; }
  .chord-card  { padding: 10px 8px; }
}

/* =========================================================================
   STAGE 3 · F5 — Triad voicings grid
   ========================================================================= */
.voicings {
  margin-top: 22px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--rad-lg);
  overflow: hidden;
}
.voicings-head {
  padding: 12px 16px;
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 14px; flex-wrap: wrap;
  border-bottom: 1px solid var(--rule);
}
.voicings-title { display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.voicings-chord {
  font-family: var(--f-display);
  font-size: 20px;
  letter-spacing: -0.01em;
  color: var(--ink);
  display: inline-flex; gap: 8px; align-items: baseline;
}
.voicings-chord b { font-weight: 500; color: var(--accent); }
.voicings-chord .muted { font-family: var(--f-mono); font-size: 12px; color: var(--ink-3); }
.voicings-foot {
  display: inline-flex; gap: 14px; align-items: center;
  font-family: var(--f-mono); font-size: 10px;
  letter-spacing: 0.14em; text-transform: uppercase;
}
.voicings-foot .muted { color: var(--ink-4); }

.voicings-grid {
  display: grid;
  grid-template-columns: 120px repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
}
.voicings-corner { background: var(--surface); }
.voicings-colhdr {
  background: var(--surface);
  padding: 10px 12px;
  font-family: var(--f-mono); font-size: 10px;
  letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ink-2);
}
.voicings-colhdr .muted { color: var(--ink-4); }
.voicings-rowhdr {
  background: var(--surface);
  padding: 14px 12px;
  display: flex; flex-direction: column; gap: 2px;
  font-family: var(--f-mono);
}
.voicings-rowhdr .set-id {
  font-size: 13px; color: var(--ink); font-weight: 500;
  letter-spacing: 0.04em;
}
.voicings-rowhdr .muted {
  font-size: 9px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--ink-4);
}
.voicings-cell {
  background: var(--surface);
  border: none;
  padding: 10px 12px 14px;
  cursor: pointer;
  font: inherit;
  display: flex; align-items: center; justify-content: center;
  min-height: 156px;
  transition: background .15s;
}
.voicings-cell:hover { background: var(--bg-2); }
.voicings-cell.active {
  background: var(--bg-2);
  box-shadow: inset 0 2px 0 var(--accent);
}
.voicings-cell.empty {
  background: var(--bg-2);
  color: var(--ink-4);
  cursor: default;
}
.voicings-cell.empty .muted {
  font-family: var(--f-mono); font-size: 18px; opacity: 0.5;
}
.chordbox-svg { max-width: 110px; }

@media (max-width: 900px) {
  .voicings-grid { grid-template-columns: 90px repeat(3, minmax(0, 1fr)); }
  .voicings-rowhdr .set-id { font-size: 11px; }
}

/* =========================================================================
   STAGE 3 · F6 — Circle of fifths / fourths
   ========================================================================= */
.circle-panel {
  margin-top: 22px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--rad-lg);
  overflow: hidden;
}
.circle-body {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(220px, 1fr);
  gap: 0;
}
.circle-svg-wrap {
  padding: 16px 24px 24px;
  display: flex; align-items: center; justify-content: center;
}
.circle-svg {
  width: 100%;
  max-width: 460px;
  height: auto;
  display: block;
}
.circle-slice {
  fill: var(--surface);
  stroke: var(--rule);
  stroke-width: 1;
  cursor: pointer;
  transition: fill .12s ease;
}
.circle-slice.ring-outer.state-idle:hover     { fill: var(--bg-2); }
.circle-slice.ring-inner.state-idle           { fill: var(--bg-2); }
.circle-slice.ring-inner.state-idle:hover     { fill: var(--surface-2); }
.circle-slice.state-neighbor {
  fill: var(--surface-2);
  stroke: var(--rule-2);
}
.circle-slice.state-relative {
  fill: var(--surface-2);
  stroke: var(--accent);
  stroke-opacity: 0.5;
  stroke-dasharray: 3 3;
}
.circle-slice.state-selected {
  fill: var(--accent);
  stroke: var(--accent);
}
.circle-label {
  cursor: pointer;
  fill: var(--ink);
  pointer-events: none;
  user-select: none;
}
.circle-label.state-selected text { fill: var(--accent-ink); font-weight: 600; }
.circle-label.state-relative text { fill: var(--accent); }
.circle-label.state-neighbor text { fill: var(--ink); }
.circle-label.state-idle    text { fill: var(--ink-2); }
.circle-label.state-idle:hover text { fill: var(--ink); }

.circle-side {
  padding: 18px 22px 24px;
  border-left: 1px solid var(--rule);
  display: flex; flex-direction: column; gap: 8px;
  background: var(--bg-2);
}
.rel-list { display: flex; flex-direction: column; gap: 8px; margin-top: 4px; }
.rel-row {
  display: flex; align-items: center; gap: 6px; flex-wrap: wrap;
}
.rel-tag {
  font-family: var(--f-mono); font-size: 9px;
  letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--ink-4);
  background: var(--surface);
  border: 1px solid var(--rule);
  padding: 3px 7px;
  border-radius: var(--rad-sm);
  min-width: 36px; text-align: center;
}
.rel-btn {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 14px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--rad-md);
  padding: 4px 10px;
  color: var(--ink);
  cursor: pointer;
  transition: border-color .15s, color .15s;
}
.rel-btn:hover { border-color: var(--accent); color: var(--accent); }
.rel-row .muted {
  font-family: var(--f-mono); font-size: 10px;
  letter-spacing: 0.10em;
  color: var(--ink-4);
}
.sig-readout {
  display: flex; align-items: baseline; gap: 12px;
}
.sig-readout .sig-big {
  font-family: var(--f-display); font-size: 28px; line-height: 1;
  color: var(--accent);
  display: inline-flex; gap: 2px;
}
.sig-readout .muted {
  font-family: var(--f-mono); font-size: 10px;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-4);
}
.circle-help {
  margin-top: auto;
  padding-top: 14px;
  font-family: var(--f-mono); font-size: 10px;
  color: var(--ink-4); letter-spacing: 0.06em;
  line-height: 1.5;
}

@media (max-width: 900px) {
  .circle-body { grid-template-columns: 1fr; }
  .circle-side { border-left: none; border-top: 1px solid var(--rule); }
}

/* =========================================================================
   STAGE 3 · F7 — Modal interchange
   ========================================================================= */
.interchange {
  margin-top: 22px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--rad-lg);
  overflow: hidden;
}
.interchange .panel-head .micro {
  font-family: var(--f-mono); font-size: 10px;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-4);
}
.ix-tabs {
  display: flex; flex-wrap: wrap;
  border-bottom: 1px solid var(--rule);
  background: var(--bg-2);
}
.ix-tab {
  background: transparent;
  border: none;
  border-right: 1px solid var(--rule);
  padding: 11px 16px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--ink-3);
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 8px;
  transition: color .15s, background .15s;
}
.ix-tab:hover { color: var(--ink); background: var(--surface); }
.ix-tab.active {
  color: var(--ink);
  background: var(--surface);
  position: relative;
}
.ix-tab.active::after {
  content: "";
  position: absolute; left: 0; right: 0; bottom: -1px;
  height: 2px; background: var(--accent);
}
.ix-tab-count {
  font-size: 9px;
  background: var(--rule);
  color: var(--ink-2);
  padding: 2px 6px;
  border-radius: 999px;
}
.ix-tab.active .ix-tab-count { background: var(--ink); color: var(--bg); }

.ix-body {
  padding: 16px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}
.ix-card {
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: var(--rad-md);
  padding: 14px 14px 12px;
  display: flex; flex-direction: column; gap: 10px;
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
  transition: border-color .15s, background .15s;
}
.ix-card:hover { border-color: var(--rule-2); background: var(--surface); }
.ix-card-head {
  display: flex; align-items: baseline; gap: 10px;
}
.ix-roman {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 26px;
  letter-spacing: -0.01em;
  color: var(--accent);
  line-height: 1;
}
.ix-name {
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--ink-2);
  letter-spacing: 0.02em;
}
.ix-meta {
  display: flex; flex-direction: column; gap: 4px;
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--rule);
}
.ix-meta-row {
  display: grid;
  grid-template-columns: 52px 1fr;
  align-items: baseline;
  gap: 10px;
  font-family: var(--f-mono);
  font-size: 11px;
  line-height: 1.4;
}
.ix-meta-lbl {
  color: var(--ink-4);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  font-size: 9px;
}
.ix-meta-val { color: var(--ink-2); }
.ix-meta-val.mono { color: var(--ink); letter-spacing: 0.06em; }
.ix-voicings {
  display: flex; gap: 8px;
  flex-wrap: wrap;
}
.ix-voicing {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--rad-sm);
  padding: 6px 8px 8px;
  cursor: pointer;
  font: inherit;
  transition: border-color .15s, background .15s;
  display: flex; flex-direction: column; gap: 4px;
  width: 116px;
}
.ix-voicing:hover { border-color: var(--accent); }
.ix-voicing-cap {
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.08em;
  display: flex; justify-content: space-between; gap: 4px;
  color: var(--ink-2);
  text-transform: uppercase;
}
.ix-voicing-cap .muted { color: var(--ink-4); }
.ix-empty {
  padding: 18px;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--ink-3);
  text-align: center;
}

.muted { color: var(--ink-4); }
.micro {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

/* =========================================================================
   COLOR-SCHEME TWEAKS DOCK — "broken future" palette switcher
   ========================================================================= */
.cs-dock {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 50;
  font-family: var(--f-mono);
}
.cs-fab {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--surface);
  border: 1px solid var(--rule);
  color: var(--ink-2);
  padding: 9px 14px;
  border-radius: 999px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 10px 30px oklch(0 0 0 / 0.10);
  transition: border-color .15s, color .15s;
}
.cs-fab:hover { border-color: var(--rule-2); color: var(--ink); }
.cs-fab-glyph { color: var(--accent); font-size: 14px; }
.cs-panel {
  width: 320px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--rad-lg);
  box-shadow: 0 18px 50px oklch(0 0 0 / 0.16);
  overflow: hidden;
}
.cs-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 14px 10px;
  border-bottom: 1px solid var(--rule);
}
.cs-title { display: flex; flex-direction: column; gap: 2px; }
.cs-title .cs-mono {
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.cs-title .cs-h {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 14px;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.cs-x {
  background: none; border: 1px solid var(--rule); border-radius: var(--rad-md);
  color: var(--ink-3);
  width: 26px; height: 26px;
  cursor: pointer;
  font-size: 11px;
}
.cs-x:hover { color: var(--ink); border-color: var(--rule-2); }

.cs-mode {
  display: grid; grid-template-columns: 1fr 1fr;
  margin: 10px 14px 0;
  border: 1px solid var(--rule);
  border-radius: var(--rad-md);
  overflow: hidden;
}
.cs-mode button {
  background: transparent;
  border: none;
  padding: 7px 10px;
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-2);
  cursor: pointer;
}
.cs-mode button + button { border-left: 1px solid var(--rule); }
.cs-mode button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--bg);
}

.cs-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 12px 14px;
}
.cs-card {
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: var(--rad-md);
  padding: 10px 10px 12px;
  text-align: left;
  cursor: pointer;
  font: inherit;
  color: inherit;
  display: flex; flex-direction: column; gap: 6px;
  transition: border-color .15s, background .15s;
}
.cs-card:hover { border-color: var(--rule-2); }
.cs-card.active {
  border-color: var(--accent);
  background: var(--surface);
  box-shadow: inset 0 0 0 1px var(--accent);
}
.cs-swatches {
  display: flex; gap: 3px;
  height: 22px;
  border-radius: 3px;
  overflow: hidden;
}
.cs-sw { flex: 1; }
.cs-name {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 13px;
  color: var(--ink);
  letter-spacing: -0.005em;
}
.cs-sub {
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--ink-4);
}
.cs-foot {
  padding: 8px 14px 12px;
  font-family: var(--f-mono);
  font-size: 9px;
  color: var(--ink-4);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  border-top: 1px solid var(--rule);
}

/* =========================================================================
   STAGE 4 · F11 — Practice routine suggester
   ========================================================================= */
.session {
  position: relative;
  margin-top: 28px;
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: var(--rad-lg);
  overflow: hidden;
}
.session[data-open="false"] { background: var(--bg-2); }

.session-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 14px 10px 12px;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}
.session[data-open="true"] .session-head { border-bottom-color: var(--rule); }

.session-toggle {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 10px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px 4px;
  font: inherit;
  color: inherit;
  text-align: left;
}
.session-toggle-glyph {
  font-family: var(--f-mono);
  font-size: 14px;
  color: var(--accent);
  width: 18px;
  text-align: center;
}
.session-toggle-title {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.session-toggle-meta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
  flex-wrap: wrap;
}
.session-toggle-meta .muted { color: var(--ink-4); }
.session-toggle-meta .key-tag {
  color: var(--accent);
  font-weight: 500;
  letter-spacing: 0.02em;
}

.session-actions {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.session-body { padding: 16px 18px 18px; }

.session-controls {
  display: flex;
  gap: 24px;
  flex-wrap: wrap;
  padding-bottom: 14px;
  margin-bottom: 14px;
  border-bottom: 1px dashed var(--rule);
}
.session-control {
  display: inline-flex;
  flex-direction: column;
  gap: 6px;
}
.session-control-focus { flex: 1; }
.session-control .seg-wrap {
  flex-wrap: wrap;
}

/* Timeline (vertical list of blocks) */
.timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}
.tl-row {
  display: grid;
  grid-template-columns: 130px 110px minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  padding: 14px 4px;
  position: relative;
}
.tl-divider {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  border-bottom: 1px dotted var(--rule);
  pointer-events: none;
}

.tl-time {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.04em;
}
.tl-start { color: var(--ink); font-weight: 500; }
.tl-dur   { color: var(--ink-4); font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase; }
.tl-bar {
  display: block;
  height: 3px;
  background: var(--rule);
  border-radius: 2px;
  position: relative;
  overflow: hidden;
}
.tl-bar::after {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: var(--len, 0%);
  background: var(--accent);
  opacity: 0.85;
}

.tl-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-2);
  padding: 4px 8px;
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: 999px;
  width: max-content;
}
.tl-pill-letter {
  display: inline-flex;
  align-items: center; justify-content: center;
  width: 16px; height: 16px;
  background: var(--ink);
  color: var(--bg);
  border-radius: 50%;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0;
}
.cat-warmup        .tl-pill-letter { background: var(--c-5th); }
.cat-technique     .tl-pill-letter { background: var(--c-3rd); }
.cat-visualization .tl-pill-letter { background: var(--c-7th); color: #1a1a1a; }
.cat-application   .tl-pill-letter { background: var(--c-root); }
.cat-extended      .tl-pill-letter { background: var(--accent); color: var(--accent-ink); }
.cat-freeplay      .tl-pill-letter { background: var(--ink); color: var(--bg); }

.tl-content { min-width: 0; }
.tl-label {
  font-family: var(--f-display);
  font-weight: 500;
  font-size: 15px;
  color: var(--ink);
  letter-spacing: -0.005em;
  text-wrap: pretty;
}
.tl-hint {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--ink-3);
  letter-spacing: 0.02em;
  margin-top: 3px;
  text-wrap: pretty;
}

.tl-jump-btn {
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: var(--rad-md);
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-2);
  padding: 6px 12px;
  cursor: pointer;
  transition: border-color .15s, color .15s, background .15s;
}
.tl-jump-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.tl-jump-muted {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--ink-4);
  padding: 6px 12px;
  display: inline-block;
}

/* Brief outline pulse on the jump target so users see where they landed. */
@keyframes jump-flash-frames {
  0%   { box-shadow: 0 0 0 0 oklch(0 0 0 / 0); }
  20%  { box-shadow: 0 0 0 4px oklch(from var(--accent) l c h / 0.45); }
  100% { box-shadow: 0 0 0 0 oklch(0 0 0 / 0); }
}
.jump-flash { animation: jump-flash-frames 1.4s ease-out; }
@media (prefers-reduced-motion: reduce) { .jump-flash { animation: none; } }

@media (max-width: 900px) {
  .tl-row {
    grid-template-columns: 1fr;
    gap: 6px;
    padding: 12px 4px;
  }
  .tl-pill { justify-self: start; }
}

/* =========================================================================
   PRINT — only the practice session is shown, clean monochrome.
   ========================================================================= */
@media print {
  * { print-color-adjust: exact; -webkit-print-color-adjust: exact; }

  .shell::before, .shell::after { display: none !important; }
  .topbar, .hero, .keycard, .panel, .harmony, .voicings,
  .interchange, .circle-panel, .hints, .status, .cs-dock {
    display: none !important;
  }
  body, .shell { background: #fff !important; color: #000 !important; }
  .frame { max-width: none !important; padding: 24px 28px !important; }

  .session {
    border: 2px solid #000 !important;
    border-radius: 0 !important;
    background: #fff !important;
    margin-top: 0 !important;
  }
  .session[data-open="false"] { background: #fff !important; }
  .session-head {
    border-bottom: 1.5px solid #000 !important;
    padding: 12px 16px !important;
  }
  .session-actions, .session-toggle-glyph { display: none !important; }
  .session-toggle-title { font-size: 22px !important; color: #000 !important; }
  .session-toggle-meta, .session-toggle-meta .key-tag,
  .session-toggle-meta .muted { color: #000 !important; }
  .session-body { padding: 16px 18px !important; }

  .session-controls { display: none !important; }
  .tl-row {
    grid-template-columns: 120px 90px 1fr !important;
    page-break-inside: avoid;
    padding: 12px 0 !important;
  }
  .tl-divider { border-bottom-color: #000 !important; }
  .tl-jump { display: none !important; }
  .tl-pill {
    background: #fff !important;
    border: 1px solid #000 !important;
    color: #000 !important;
  }
  .tl-pill-letter {
    background: #000 !important;
    color: #fff !important;
  }
  .tl-bar { background: #ccc !important; }
  .tl-bar::after { background: #000 !important; opacity: 1 !important; }
  .tl-start, .tl-dur, .tl-hint, .tl-label { color: #000 !important; }

  /* Header line for the printed sheet */
  .session::before {
    content: "fretboard codex // today's session";
    display: block;
    font-family: "JetBrains Mono", monospace;
    font-size: 10px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    padding: 0 16px 4px;
    color: #000;
  }
}

/* =========================================================================
   COLOR SCHEMES — "broken future" palette tokens.
   Each scheme overrides --bg / --surface / --ink / --accent for light + dark.
   The defaults at the top of the file act as the implicit "steel/sand" base;
   data-scheme="rebel" makes that explicit and warms the warm-side surfaces.
   ========================================================================= */

/* ---- 1. REBEL BASE — warm sand + burnt orange — desert-outpost daylight ---- */
[data-scheme="rebel"][data-theme="light"], :root[data-scheme="rebel"] {
  --bg:        oklch(0.945 0.013 70);
  --bg-2:      oklch(0.970 0.010 72);
  --surface:   oklch(0.985 0.008 72);
  --surface-2: oklch(0.910 0.018 68);
  --ink:       oklch(0.22 0.020 50);
  --ink-2:     oklch(0.38 0.018 52);
  --ink-3:     oklch(0.56 0.016 56);
  --ink-4:     oklch(0.72 0.012 56);
  --rule:      oklch(0.86 0.018 65);
  --rule-2:    oklch(0.76 0.022 60);
  --accent:    oklch(0.62 0.18 42);
  --accent-ink: oklch(0.985 0.005 70);
  --c-root:  oklch(0.62 0.18 42);
  --c-3rd:   oklch(0.52 0.14 240);
  --c-5th:   oklch(0.56 0.14 160);
  --c-7th:   oklch(0.72 0.16 80);
}
[data-scheme="rebel"][data-theme="dark"] {
  --bg:        oklch(0.22 0.012 50);
  --bg-2:      oklch(0.26 0.014 52);
  --surface:   oklch(0.30 0.014 54);
  --surface-2: oklch(0.36 0.014 54);
  --ink:       oklch(0.96 0.012 70);
  --ink-2:     oklch(0.82 0.012 70);
  --ink-3:     oklch(0.64 0.012 70);
  --ink-4:     oklch(0.50 0.014 60);
  --rule:      oklch(0.40 0.014 54);
  --rule-2:    oklch(0.50 0.016 54);
  --accent:    oklch(0.78 0.15 50);
  --accent-ink: oklch(0.22 0.010 50);
  --c-root:  oklch(0.78 0.15 50);
  --c-3rd:   oklch(0.72 0.12 230);
  --c-5th:   oklch(0.74 0.12 160);
  --c-7th:   oklch(0.82 0.14 85);
}

/* ---- 2. CONSOLE AMBER — charcoal + CRT amber ---- */
[data-scheme="console"][data-theme="light"] {
  --bg:        oklch(0.94 0.005 250);
  --bg-2:      oklch(0.97 0.004 250);
  --surface:   oklch(0.99 0.003 250);
  --surface-2: oklch(0.90 0.006 245);
  --ink:       oklch(0.20 0.012 250);
  --ink-2:     oklch(0.36 0.010 250);
  --ink-3:     oklch(0.54 0.008 250);
  --ink-4:     oklch(0.72 0.006 250);
  --rule:      oklch(0.85 0.006 250);
  --rule-2:    oklch(0.74 0.008 250);
  --accent:    oklch(0.62 0.17 60);
  --accent-ink: oklch(0.99 0.003 250);
  --c-root:  oklch(0.62 0.17 60);
  --c-3rd:   oklch(0.50 0.14 250);
  --c-5th:   oklch(0.54 0.13 175);
  --c-7th:   oklch(0.68 0.16 90);
}
[data-scheme="console"][data-theme="dark"] {
  --bg:        oklch(0.22 0.008 250);
  --bg-2:      oklch(0.26 0.009 248);
  --surface:   oklch(0.30 0.010 248);
  --surface-2: oklch(0.36 0.012 248);
  --ink:       oklch(0.96 0.020 75);
  --ink-2:     oklch(0.85 0.030 75);
  --ink-3:     oklch(0.68 0.040 75);
  --ink-4:     oklch(0.50 0.030 75);
  --rule:      oklch(0.38 0.012 248);
  --rule-2:    oklch(0.48 0.014 248);
  --accent:    oklch(0.82 0.14 75);
  --accent-ink: oklch(0.18 0.010 248);
  --c-root:  oklch(0.82 0.14 75);
  --c-3rd:   oklch(0.72 0.10 230);
  --c-5th:   oklch(0.74 0.10 160);
  --c-7th:   oklch(0.86 0.13 90);
}

/* ---- 3. VERDIGRIS — cool steel + oxidized copper ---- */
[data-scheme="verdigris"][data-theme="light"] {
  --bg:        oklch(0.93 0.008 220);
  --bg-2:      oklch(0.96 0.006 220);
  --surface:   oklch(0.98 0.005 220);
  --surface-2: oklch(0.89 0.009 222);
  --ink:       oklch(0.22 0.018 230);
  --ink-2:     oklch(0.38 0.016 230);
  --ink-3:     oklch(0.55 0.014 228);
  --ink-4:     oklch(0.72 0.010 226);
  --rule:      oklch(0.85 0.012 222);
  --rule-2:    oklch(0.74 0.014 220);
  --accent:    oklch(0.62 0.12 170);
  --accent-ink: oklch(0.985 0.004 220);
  --c-root:  oklch(0.60 0.13 170);
  --c-3rd:   oklch(0.52 0.14 250);
  --c-5th:   oklch(0.58 0.16 110);
  --c-7th:   oklch(0.68 0.16 60);
}
[data-scheme="verdigris"][data-theme="dark"] {
  --bg:        oklch(0.22 0.012 220);
  --bg-2:      oklch(0.26 0.014 220);
  --surface:   oklch(0.30 0.014 222);
  --surface-2: oklch(0.36 0.015 222);
  --ink:       oklch(0.96 0.010 200);
  --ink-2:     oklch(0.82 0.012 200);
  --ink-3:     oklch(0.64 0.012 200);
  --ink-4:     oklch(0.50 0.012 200);
  --rule:      oklch(0.40 0.012 220);
  --rule-2:    oklch(0.50 0.014 220);
  --accent:    oklch(0.74 0.12 170);
  --accent-ink: oklch(0.20 0.010 220);
  --c-root:  oklch(0.74 0.12 170);
  --c-3rd:   oklch(0.72 0.10 245);
  --c-5th:   oklch(0.76 0.12 110);
  --c-7th:   oklch(0.80 0.13 60);
}

/* ---- 4. RUST + BONE — bone + iron oxide ---- */
[data-scheme="rust"][data-theme="light"] {
  --bg:        oklch(0.93 0.014 60);
  --bg-2:      oklch(0.96 0.011 62);
  --surface:   oklch(0.985 0.009 62);
  --surface-2: oklch(0.90 0.018 58);
  --ink:       oklch(0.22 0.020 30);
  --ink-2:     oklch(0.36 0.018 30);
  --ink-3:     oklch(0.55 0.016 35);
  --ink-4:     oklch(0.72 0.012 40);
  --rule:      oklch(0.85 0.018 50);
  --rule-2:    oklch(0.74 0.022 45);
  --accent:    oklch(0.50 0.16 28);
  --accent-ink: oklch(0.985 0.005 60);
  --c-root:  oklch(0.50 0.16 28);
  --c-3rd:   oklch(0.48 0.14 240);
  --c-5th:   oklch(0.54 0.13 160);
  --c-7th:   oklch(0.66 0.14 80);
}
[data-scheme="rust"][data-theme="dark"] {
  --bg:        oklch(0.20 0.014 30);
  --bg-2:      oklch(0.25 0.016 32);
  --surface:   oklch(0.29 0.016 32);
  --surface-2: oklch(0.34 0.017 32);
  --ink:       oklch(0.96 0.012 60);
  --ink-2:     oklch(0.82 0.014 55);
  --ink-3:     oklch(0.64 0.014 50);
  --ink-4:     oklch(0.50 0.014 45);
  --rule:      oklch(0.38 0.016 32);
  --rule-2:    oklch(0.48 0.018 32);
  --accent:    oklch(0.66 0.18 30);
  --accent-ink: oklch(0.20 0.010 30);
  --c-root:  oklch(0.66 0.18 30);
  --c-3rd:   oklch(0.70 0.10 240);
  --c-5th:   oklch(0.72 0.10 160);
  --c-7th:   oklch(0.80 0.14 80);
}

/* ---- 5. PHOSPHOR — dark olive + CRT green (always reads as a console) ---- */
[data-scheme="phosphor"][data-theme="light"] {
  --bg:        oklch(0.94 0.012 140);
  --bg-2:      oklch(0.97 0.009 140);
  --surface:   oklch(0.985 0.007 140);
  --surface-2: oklch(0.90 0.014 140);
  --ink:       oklch(0.22 0.018 145);
  --ink-2:     oklch(0.38 0.016 145);
  --ink-3:     oklch(0.55 0.014 145);
  --ink-4:     oklch(0.72 0.010 145);
  --rule:      oklch(0.85 0.012 140);
  --rule-2:    oklch(0.74 0.014 140);
  --accent:    oklch(0.55 0.16 145);
  --accent-ink: oklch(0.985 0.006 140);
  --c-root:  oklch(0.55 0.16 145);
  --c-3rd:   oklch(0.50 0.14 250);
  --c-5th:   oklch(0.58 0.13 95);
  --c-7th:   oklch(0.66 0.15 55);
}
[data-scheme="phosphor"][data-theme="dark"] {
  --bg:        oklch(0.18 0.010 145);
  --bg-2:      oklch(0.22 0.012 145);
  --surface:   oklch(0.26 0.014 145);
  --surface-2: oklch(0.32 0.016 145);
  --ink:       oklch(0.95 0.13 145);
  --ink-2:     oklch(0.80 0.13 145);
  --ink-3:     oklch(0.62 0.12 145);
  --ink-4:     oklch(0.46 0.10 145);
  --rule:      oklch(0.34 0.020 145);
  --rule-2:    oklch(0.42 0.024 145);
  --accent:    oklch(0.85 0.16 145);
  --accent-ink: oklch(0.16 0.010 145);
  --c-root:  oklch(0.85 0.16 145);
  --c-3rd:   oklch(0.74 0.12 200);
  --c-5th:   oklch(0.80 0.14 110);
  --c-7th:   oklch(0.86 0.15 70);
}

/* ---- 6. HAZARD — concrete + radiation yellow ---- */
[data-scheme="hazard"][data-theme="light"] {
  --bg:        oklch(0.93 0.005 90);
  --bg-2:      oklch(0.96 0.004 90);
  --surface:   oklch(0.98 0.004 90);
  --surface-2: oklch(0.89 0.006 88);
  --ink:       oklch(0.20 0.010 90);
  --ink-2:     oklch(0.36 0.010 90);
  --ink-3:     oklch(0.54 0.008 88);
  --ink-4:     oklch(0.72 0.006 86);
  --rule:      oklch(0.85 0.006 88);
  --rule-2:    oklch(0.74 0.008 88);
  --accent:    oklch(0.74 0.17 95);
  --accent-ink: oklch(0.18 0.010 90);
  --c-root:  oklch(0.74 0.17 95);
  --c-3rd:   oklch(0.50 0.14 245);
  --c-5th:   oklch(0.56 0.13 165);
  --c-7th:   oklch(0.60 0.16 35);
}
[data-scheme="hazard"][data-theme="dark"] {
  --bg:        oklch(0.20 0.008 90);
  --bg-2:      oklch(0.24 0.010 90);
  --surface:   oklch(0.28 0.010 90);
  --surface-2: oklch(0.34 0.012 90);
  --ink:       oklch(0.96 0.010 90);
  --ink-2:     oklch(0.82 0.012 90);
  --ink-3:     oklch(0.64 0.012 90);
  --ink-4:     oklch(0.50 0.012 90);
  --rule:      oklch(0.38 0.012 90);
  --rule-2:    oklch(0.48 0.014 90);
  --accent:    oklch(0.86 0.18 95);
  --accent-ink: oklch(0.18 0.010 90);
  --c-root:  oklch(0.86 0.18 95);
  --c-3rd:   oklch(0.72 0.10 240);
  --c-5th:   oklch(0.74 0.12 160);
  --c-7th:   oklch(0.78 0.16 40);
}

/* =========================================================================
   STAGE 5 — Collapsible panel chevron
   Each panel-head can host a <CollapseBtn /> at its start.
   ========================================================================= */
.head-collapse {
  appearance: none;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--rad-sm);
  color: var(--ink-3);
  width: 22px; height: 22px;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: pointer;
  padding: 0;
  margin-right: 4px;
  font-family: var(--f-mono);
  transition: color .15s ease, background .15s ease, border-color .15s ease;
  flex-shrink: 0;
}
.head-collapse:hover { color: var(--ink); background: var(--bg-2); border-color: var(--rule); }
.head-collapse-glyph { font-size: 13px; line-height: 1; }

[data-open="false"] .panel-head,
[data-open="false"] .voicings-head {
  border-bottom-color: transparent !important;
}

/* =========================================================================
   STAGE 5 — Voicings head + tabs
   ========================================================================= */
.voicings-head {
  padding: 12px 16px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--rule);
  flex-wrap: wrap;
}
.voicings-head .voicings-title {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.voicings-tabs {
  display: inline-flex;
  border: 1px solid var(--rule);
  border-radius: var(--rad-md);
  background: var(--surface);
  overflow: hidden;
}
.voicings-tabs button {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 8px 14px;
  background: transparent;
  border: none;
  border-right: 1px solid var(--rule);
  color: var(--ink-3);
  cursor: pointer;
  transition: background .15s ease, color .15s ease;
}
.voicings-tabs button:last-child { border-right: none; }
.voicings-tabs button:hover { color: var(--ink); background: var(--bg-2); }
.voicings-tabs button[aria-selected="true"] {
  background: var(--ink);
  color: var(--bg);
}

.voicings-subhead {
  padding: 10px 16px;
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--f-mono); font-size: 10px;
  letter-spacing: 0.14em; text-transform: uppercase;
  border-bottom: 1px solid var(--rule);
  gap: 16px;
  flex-wrap: wrap;
}
.voicings-subhead .muted { color: var(--ink-4); }

/* Banner above the 7ths grid */
.voicings-banner {
  padding: 12px 16px;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--ink-2);
  border-bottom: 1px solid var(--rule);
  display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap;
}
.voicings-banner b {
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.02em;
}
.voicings-banner .muted { color: var(--ink-4); }

/* 7ths grid = 4 columns (4 inversions) */
.voicings-grid--seven {
  grid-template-columns: 120px repeat(4, minmax(0, 1fr)) !important;
}
@media (max-width: 900px) {
  .voicings-grid--seven {
    grid-template-columns: 90px repeat(4, minmax(0, 1fr)) !important;
  }
}

/* =========================================================================
   STAGE 5 — Extensions builder
   ========================================================================= */
.ext-builder {
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.ext-base {
  font-family: var(--f-mono);
  font-size: 12px;
  color: var(--ink-3);
  display: flex; align-items: baseline; gap: 8px;
  letter-spacing: 0.04em;
}
.ext-base b {
  font-family: var(--f-display);
  font-size: 20px;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: -0.01em;
}
.ext-base-q { color: var(--ink-4); font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase; }
.ext-base-lbl { letter-spacing: 0.18em; text-transform: uppercase; font-size: 10px; }

.ext-toggles {
  display: flex;
  gap: 22px;
  align-items: flex-end;
  flex-wrap: wrap;
}
.ext-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.ext-group-lbl {
  font-family: var(--f-mono);
  font-size: 9px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-4);
  padding-left: 2px;
}
.ext-group-row {
  display: flex;
  gap: 4px;
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: var(--rad-md);
  padding: 3px;
}
.ext-btn {
  position: relative;
  appearance: none;
  background: transparent;
  border: none;
  border-radius: var(--rad-sm);
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--ink-2);
  padding: 8px 12px;
  min-width: 44px;
  cursor: pointer;
  transition: background .15s ease, color .15s ease, opacity .15s ease;
}
.ext-btn:hover:not([disabled]) {
  background: var(--surface);
  color: var(--ink);
}
.ext-btn.active {
  background: var(--accent);
  color: var(--accent-ink);
}
.ext-btn.status-avoid:not(.active) {
  color: var(--c-root);
}
.ext-btn[disabled] {
  opacity: 0.32;
  cursor: not-allowed;
  text-decoration: line-through;
  text-decoration-thickness: 1px;
}
.ext-warn {
  position: absolute;
  top: 1px;
  right: 3px;
  font-size: 8px;
  font-weight: 700;
  color: var(--c-root);
  opacity: 0.8;
}
.ext-btn.active .ext-warn { color: var(--accent-ink); }

.ext-clear {
  margin-left: auto;
}

.ext-result {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 14px 12px;
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: var(--rad-md);
}
.ext-result-symbol {
  display: flex; align-items: baseline; gap: 12px;
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--ink-4);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  flex-wrap: wrap;
}
.ext-result-symbol b {
  font-family: var(--f-display);
  font-size: 26px;
  font-weight: 500;
  letter-spacing: -0.01em;
  text-transform: none;
  color: var(--accent);
}
.ext-result-notes {
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--ink-3);
  display: flex; gap: 4px; align-items: baseline; flex-wrap: wrap;
}
.ext-result-notes .muted { color: var(--ink-4); }
.ext-result-note b {
  color: var(--accent);
  font-weight: 600;
}

.ust-card {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "head head"
    "slash flavor"
    "hint hint";
  gap: 6px 16px;
  padding: 14px 16px;
  border: 1px dashed var(--accent);
  border-radius: var(--rad-md);
  background: linear-gradient(
    180deg,
    color-mix(in oklch, var(--accent) 7%, var(--surface)) 0%,
    var(--surface) 100%
  );
}
.ust-head {
  grid-area: head;
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--ink-4);
  letter-spacing: 0.18em;
  text-transform: uppercase;
}
.ust-roman {
  color: var(--accent);
  font-weight: 600;
  font-size: 12px;
}
.ust-slash {
  grid-area: slash;
  font-family: var(--f-display);
  font-size: 24px;
  font-weight: 500;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.ust-flavor {
  grid-area: flavor;
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--ink-3);
  align-self: end;
  text-align: right;
}
.ust-hint {
  grid-area: hint;
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--ink-4);
  letter-spacing: 0.04em;
}
.ust-hint b { color: var(--ink-2); font-weight: 500; }

.ext-foot {
  font-family: var(--f-mono);
  font-size: 10px;
  color: var(--ink-4);
  letter-spacing: 0.04em;
}

/* Legend swatch for the extension role (outlined dashed) */
.legend .swatch.ext {
  background: var(--surface);
  border: 1.5px dashed var(--accent);
}

/* =========================================================================
   STAGE 5 — Minimal site footer (replaces .status block)
   ========================================================================= */
.footer {
  margin-top: 28px;
  padding: 18px 4px 6px;
  display: flex;
  justify-content: flex-end;
  border-top: 1px solid var(--rule);
}
.footer .codex-mark {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 500;
}

/* =========================================================================
   STAGE 5 — Compact density (tweakable)
   ========================================================================= */
[data-density="compact"] .frame { padding: 14px 22px 22px; }
[data-density="compact"] .hero { padding: 22px 16px 18px; }
[data-density="compact"] .tonic-display { gap: 6px; }
[data-density="compact"] .tonic-letter { font-size: 96px; }
[data-density="compact"] .keycard,
[data-density="compact"] .harmony,
[data-density="compact"] .panel,
[data-density="compact"] .voicings,
[data-density="compact"] .interchange,
[data-density="compact"] .circle-panel,
[data-density="compact"] .session {
  margin-top: 12px;
}
[data-density="compact"] .panel-body { padding: 12px 12px 10px; }
[data-density="compact"] .ext-builder { gap: 12px; padding: 14px; }

/* =========================================================================
   STAGE 5.1 — Drag-to-reorder bottom panels
   ========================================================================= */
.head-drag {
  appearance: none;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--rad-sm);
  color: var(--ink-4);
  width: 22px; height: 22px;
  padding: 0;
  margin-right: 2px;
  display: inline-flex; align-items: center; justify-content: center;
  cursor: grab;
  flex-shrink: 0;
  transition: color .15s ease, background .15s ease, border-color .15s ease;
}
.head-drag:hover {
  color: var(--ink-2);
  background: var(--bg-2);
  border-color: var(--rule);
}
.head-drag:active { cursor: grabbing; }
.head-drag-glyph { display: block; }

/* The session header has its own structure — give the grip room there too. */
.session-head .head-drag {
  margin-left: 4px;
  align-self: center;
}

/* Visual states */
[data-panel-id] {
  transition: opacity .18s ease, transform .18s ease, outline-color .15s ease;
}
[data-panel-id][data-dragging="true"] {
  opacity: 0.38;
  transform: scale(0.985);
}
[data-panel-id][data-drag-over="true"] {
  outline: 2px dashed var(--accent);
  outline-offset: 4px;
  border-radius: var(--rad-lg);
}
[data-panel-id][data-drag-over="true"][data-dragging="true"] {
  outline: none;
}