/* =============================================================================
   SCALEFORGE — editorial reference aesthetic
   Warm paper, navy ink, amber spot color, engraved feel.
   ============================================================================= */

/* ---------- Tokens --------------------------------------------------------- */
:root {
  /* Paper / surface */
  --paper:           #f6f1e7;        /* warm off-white background */
  --paper-card:      #fcfaf4;        /* cards, slightly brighter */
  --paper-deep:      #ede5d3;        /* hovers, borders */
  --paper-rule:      #d8ceb8;        /* hairline rules */

  /* Ink */
  --ink:             #1a2438;        /* primary text, near-black navy */
  --ink-soft:        #3c4659;        /* secondary text */
  --ink-faint:       #707b91;        /* tertiary, hints */
  --ink-ghost:       #a8b0c0;        /* placeholders, disabled */

  /* Spot */
  --amber:           #c8841e;        /* root notes, primary action — warmer than original f59e0b */
  --amber-deep:      #a06912;
  --amber-soft:      #f0d49a;
  --amber-wash:      #faedd0;        /* tinted backgrounds */

  /* Scale tone */
  --navy:            #1e3a5f;
  --navy-deep:       #142845;

  /* Category colors (subdued, paper-friendly) */
  --cat-basic:       #e8d5a5;
  --cat-modes:       #d4cce0;
  --cat-mm:          #ddd5e5;
  --cat-bebop:       #f0d4a0;
  --cat-blues:       #e8c8c0;
  --cat-pent:        #cdd9c2;
  --cat-sym:         #c8d5d5;

  /* Geometry */
  --rule:            1px solid var(--paper-rule);
  --rule-strong:     1px solid var(--ink);
  --radius:          2px;             /* sharp, engraved feel */
  --radius-card:     6px;

  /* Typography */
  --serif:           'Fraunces', 'Iowan Old Style', Georgia, serif;
  --sans:            'Manrope', system-ui, -apple-system, 'Helvetica Neue', sans-serif;
  --mono:            'JetBrains Mono', 'SF Mono', 'Menlo', monospace;
}

/* ---------- Reset / base --------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 14px;
  line-height: 1.5;
  font-feature-settings: "ss01", "kern";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
}

button {
  font-family: inherit;
  font-size: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  color: inherit;
}

select {
  font-family: inherit;
  font-size: inherit;
  background: var(--paper-card);
  border: 1px solid var(--paper-rule);
  color: var(--ink);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius);
  cursor: pointer;
}
select:focus { outline: 2px solid var(--amber); outline-offset: 1px; }

/* Page texture — subtle grain via SVG noise filter */
body::before {
  content: "";
  position: fixed; inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.92' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.1 0 0 0 0 0.14 0 0 0 0 0.21 0 0 0 0.04 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1;
  opacity: 0.5;
  mix-blend-mode: multiply;
}

#app { position: relative; z-index: 2; }

/* ---------- Boot screen ---------------------------------------------------- */
.boot {
  min-height: 100vh;
  display: grid; place-items: center;
  text-align: center;
  font-family: var(--serif);
  color: var(--ink);
}
.boot-mark {
  font-size: 6rem;
  line-height: 1;
  color: var(--amber-deep);
  opacity: 0.55;
}
.boot-title {
  font-size: 2.5rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  margin-top: 0.5rem;
  font-variation-settings: "SOFT" 50, "WONK" 1;
}
.boot-sub {
  font-family: var(--sans);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.25em;
  color: var(--ink-faint);
  margin-top: 1rem;
}

/* =============================================================================
   Header
   ============================================================================= */
.masthead {
  border-bottom: var(--rule);
  background: var(--paper);
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}
.masthead-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.25rem 1.5rem 1rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
}
.masthead-instrument {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}
.brand {
  font-family: var(--serif);
  font-size: 1.75rem;
  font-weight: 500;
  letter-spacing: -0.02em;
  font-variation-settings: "SOFT" 80, "WONK" 1, "opsz" 144;
  line-height: 1;
}
.brand sup {
  font-family: var(--sans);
  font-size: 0.5rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--amber-deep);
  margin-left: 0.5rem;
  vertical-align: top;
  position: relative;
  top: 0.25rem;
}
.tagline {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.95rem;
  color: var(--ink-soft);
  font-variation-settings: "opsz" 14;
}
.tagline::before { content: "—  "; color: var(--ink-ghost); }

.brandmark {
  font-family: var(--serif);
  color: var(--amber-deep);
  font-size: 2rem;
  line-height: 1;
}

/* =============================================================================
   Controls strip
   ============================================================================= */
.controls {
  border-bottom: var(--rule);
  background: var(--paper-card);
}
.controls-inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

/* Chord search */
.chord-search-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--paper-rule);
  margin-bottom: 0.1rem;
}
.chord-search-field {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--paper);
  border: 1.5px solid var(--paper-rule);
  border-radius: var(--radius);
  padding: 0.35rem 0.6rem;
  transition: border-color 150ms;
  max-width: 360px;
}
.chord-search-field:focus-within {
  border-color: var(--amber);
}
.chord-search-icon {
  font-size: 0.9rem;
  color: var(--ink-faint);
  flex-shrink: 0;
  line-height: 1;
}
.chord-search-input {
  border: none;
  outline: none;
  background: transparent;
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ink);
  flex: 1;
  min-width: 0;
}
.chord-search-input::placeholder {
  color: var(--ink-ghost);
  font-weight: 400;
}
.chord-search-clear {
  background: transparent;
  border: none;
  color: var(--ink-faint);
  font-size: 0.75rem;
  cursor: pointer;
  padding: 0 0.1rem;
  line-height: 1;
  flex-shrink: 0;
  transition: color 120ms;
}
.chord-search-clear:hover { color: var(--ink); }
.chord-search-hint {
  font-family: var(--sans);
  font-size: 0.72rem;
  color: var(--ink-faint);
  margin: 0;
  padding-left: 0.2rem;
}

/* Chord results */
.chord-results {
  max-width: 1280px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3rem;
  width: 100%;
}
.chord-results-header {
  display: flex;
  align-items: baseline;
  gap: 0.4rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.75rem;
  border-bottom: var(--rule);
}
.chord-results-label {
  font-family: var(--sans);
  font-size: 0.75rem;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.chord-results-chord {
  font-family: var(--mono);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--amber-deep);
}
.chord-results-empty {
  max-width: 1280px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
  font-family: var(--serif);
  font-style: italic;
  color: var(--ink-faint);
  font-size: 1rem;
}
.chord-results .booklet-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.25rem;
}
.chord-results-caution-header {
  margin: 2rem 0 0.75rem;
  padding: 0.75rem 1rem;
  background: hsl(38 60% 94%);
  border: 1px solid hsl(38 40% 82%);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.chord-results-caution-label {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: hsl(38 60% 30%);
}
.chord-results-caution-desc {
  font-family: var(--sans);
  font-size: 0.75rem;
  color: hsl(38 40% 40%);
  line-height: 1.4;
}
.chord-results-caution-grid {
  opacity: 0.82;
}

.control-group {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.control-label {
  font-family: var(--sans);
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
  white-space: nowrap;
}

/* Pills — root keys, scale picker, etc. */
.pill {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--paper-rule);
  background: var(--paper-card);
  color: var(--ink);
  border-radius: var(--radius);
  letter-spacing: 0.03em;
  transition: background 120ms, border-color 120ms, color 120ms;
  min-width: 2.5rem;
  text-align: center;
}
.pill:hover { background: var(--paper-deep); border-color: var(--ink-faint); }
.pill[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}
.pill.amber[aria-pressed="true"] {
  background: var(--amber);
  color: var(--paper);
  border-color: var(--amber-deep);
}

.pill-row { display: flex; flex-wrap: wrap; gap: 0.35rem; align-items: center; }

/* Split pill — enharmonic pairs shown as two joined halves */
.split-pill {
  display: inline-flex;
  border: 1px solid var(--paper-rule);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 120ms;
}
.split-pill:has(.split-half[aria-pressed="true"]) {
  border-color: var(--amber-deep);
}
.split-half {
  font-family: var(--mono);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.4rem 0.5rem;
  background: var(--paper-card);
  color: var(--ink);
  border: none;
  letter-spacing: 0.03em;
  transition: background 120ms, color 120ms;
  white-space: nowrap;
  min-width: 1.85rem;
  text-align: center;
  cursor: pointer;
}
.split-half:hover { background: var(--paper-deep); }
.split-left  { border-right: 1px solid var(--paper-rule); }
.split-half.amber[aria-pressed="true"] {
  background: var(--amber);
  color: #fff;
}
.split-half[aria-pressed="false"]:hover,
.split-half:not([aria-pressed="true"]):hover {
  background: var(--paper-deep);
  color: var(--ink);
}

/* Mode selector (segmented) */
.segment {
  display: inline-flex;
  border: 1px solid var(--paper-rule);
  border-radius: var(--radius);
  overflow: hidden;
}
.segment button {
  padding: 0.4rem 0.85rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-soft);
  background: var(--paper-card);
  border-right: 1px solid var(--paper-rule);
}
.segment button:last-child { border-right: 0; }
.segment button:hover { background: var(--paper-deep); color: var(--ink); }
.segment button[aria-pressed="true"] {
  background: var(--ink);
  color: var(--paper);
}

/* BPM stepper */
.stepper {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--paper-rule);
  border-radius: var(--radius);
  background: var(--paper-card);
  font-family: var(--mono);
}
.stepper button {
  width: 1.75rem;
  height: 1.75rem;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink-soft);
}
.stepper button:hover { color: var(--ink); background: var(--paper-deep); }
.stepper-value {
  min-width: 2.5rem;
  text-align: center;
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--ink);
  border-left: 1px solid var(--paper-rule);
  border-right: 1px solid var(--paper-rule);
  padding: 0 0.4rem;
  line-height: 1.75rem;
}

/* =============================================================================
   Card grid
   ============================================================================= */
.booklet {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

.empty-state {
  text-align: center;
  padding: 5rem 1rem;
  color: var(--ink-faint);
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.1rem;
}

.section-mark {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 1.5rem 0 0.75rem;
  border-bottom: 1px solid var(--paper-rule);
  margin-bottom: 1.5rem;
}
.section-mark:first-child { padding-top: 0; }
.section-title {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 400;
  font-style: italic;
  letter-spacing: -0.01em;
  color: var(--ink);
  font-variation-settings: "opsz" 24, "SOFT" 50;
}
.section-count {
  font-family: var(--mono);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--ink-faint);
}
.section-rule {
  flex: 1;
  height: 1px;
  background: var(--paper-rule);
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
@media (min-width: 700px)  { .grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .grid { grid-template-columns: repeat(3, 1fr); } }

.card {
  background: var(--paper-card);
  border: 1px solid var(--paper-rule);
  border-radius: var(--radius-card);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  animation: card-in 380ms ease-out both;
  animation-delay: calc(var(--idx, 0) * 30ms);
}

@keyframes card-in {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: none; }
}

.card-head {
  padding: 0.85rem 1rem 0.65rem;
  border-bottom: 1px solid var(--paper-rule);
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}
.card-head-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}
.card-head-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}
.fs-expand-btn {
  width: 1.5rem;
  height: 1.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  background: transparent;
  color: var(--ink-ghost);
  border: 1px solid transparent;
  border-radius: var(--radius);
  transition: color 120ms, background 120ms, border-color 120ms;
  cursor: pointer;
  line-height: 1;
}
.fs-expand-btn:hover {
  color: var(--ink);
  background: var(--paper-deep);
  border-color: var(--paper-rule);
}
.card-title {
  font-family: var(--serif);
  font-size: 1.1rem;
  font-weight: 500;
  font-variation-settings: "opsz" 14;
  letter-spacing: -0.01em;
  color: var(--ink);
}
.card-title .root {
  color: var(--amber-deep);
  font-weight: 600;
}
.card-cat {
  font-family: var(--sans);
  font-size: 0.6rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.card-body {
  padding: 0.5rem 0.5rem 0.75rem;
  background: #fefcf6;
  flex: 1;
}

.card-pills {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--paper-rule);
  border-bottom: 1px solid var(--paper-rule);
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  background: var(--paper-card);
}
.note-pill {
  font-family: var(--mono);
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.2rem 0.5rem;
  border: 1px solid var(--paper-rule);
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius);
  letter-spacing: 0.03em;
}
.note-pill.root {
  background: var(--amber);
  color: #fff;
  border-color: var(--amber-deep);
  font-weight: 700;
}

.card-chords {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.3rem;
}
.card-chords-arrow {
  font-size: 0.75rem;
  color: var(--ink-faint);
  margin-right: 0.1rem;
  flex-shrink: 0;
  font-family: var(--sans);
}
.chord-tag {
  font-family: var(--mono);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: var(--radius);
  background: hsl(210 30% 92%);
  color: hsl(210 40% 30%);
  border: 1px solid hsl(210 25% 82%);
  letter-spacing: 0.01em;
  white-space: nowrap;
}

.card-foot {
  padding: 0.75rem 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  background: var(--paper-card);
}
.formula {
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.play-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius);
  transition: background 120ms;
  white-space: nowrap;
}
.play-btn:hover { background: var(--navy-deep); }
.play-btn.playing { background: var(--amber); color: #fff; }
.play-btn .glyph {
  font-family: var(--serif);
  font-size: 0.85rem;
  line-height: 1;
}

.octave-shift {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-family: var(--mono);
  font-size: 0.7rem;
  color: var(--ink-faint);
}
.octave-shift button {
  width: 1.4rem;
  height: 1.4rem;
  border: 1px solid var(--paper-rule);
  border-radius: var(--radius);
  font-weight: 700;
  background: var(--paper);
  color: var(--ink-soft);
}
.octave-shift button:hover:not(:disabled) { background: var(--paper-deep); color: var(--ink); }
.octave-shift button:disabled { opacity: 0.3; cursor: not-allowed; }
.octave-shift-value { min-width: 1.5rem; text-align: center; font-weight: 600; color: var(--ink); }

.octave-count {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  font-family: var(--mono);
  font-size: 0.7rem;
}
.octave-count-label {
  color: var(--ink-faint);
  margin-right: 0.15rem;
  font-style: italic;
}
.octave-count-btn {
  width: 1.4rem;
  height: 1.4rem;
  border: 1px solid var(--paper-rule);
  border-radius: var(--radius);
  font-weight: 600;
  font-family: var(--mono);
  font-size: 0.7rem;
  background: var(--paper);
  color: var(--ink-soft);
  transition: background 100ms, color 100ms, border-color 100ms;
}
.octave-count-btn:hover { background: var(--paper-deep); color: var(--ink); }
.octave-count-btn.active {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

/* =============================================================================
   SVG diagram styling
   ============================================================================= */
.diagram-svg {
  width: 100%;
  height: auto;
  display: block;
  background: #f6f1e7;        /* fixed light surface — diagrams never retheme */
  border-radius: 3px;
}

/* notation — hardcoded light-mode values so diagrams look identical in dark mode */
.staff-line { stroke: #707b91; stroke-width: 0.8; }
.ledger-line { stroke: #707b91; stroke-width: 0.8; }
.note-head { fill: #1e3a5f; }
.note-head.root { fill: #c8841e; }
.note-stem { stroke-width: 1.2; }
.accidental { font-family: var(--serif); font-weight: 600; fill: #1a2438; }
.note-label { font-family: var(--mono); font-size: 8px; font-weight: 600; fill: #3c4659; }
.note-label.root { fill: #a06912; font-weight: 700; }
.clef-glyph { font-family: var(--serif); fill: #3c4659; }
.barline { stroke: #3c4659; }

/* fretboard */
.fb-fret-line { stroke: #d8ceb8; stroke-width: 1; }
.fb-string-line { stroke: #707b91; stroke-width: 0.8; }
.fb-nut { stroke: #1a2438; stroke-width: 2.5; }
.fb-marker { fill: #ede5d3; }
.fb-fret-label { font-family: var(--mono); font-size: 8px; fill: #707b91; }
.fb-dot { stroke: none; }
.fb-dot.root { fill: #c8841e; }
.fb-dot.tone { fill: #1e3a5f; }
.fb-dot-label { font-family: var(--mono); font-size: 7px; font-weight: 700; fill: #fff; }

/* piano */
.kb-white { fill: #fdfaf2; stroke: #3c4659; stroke-width: 0.5; }
.kb-white.in-scale { fill: #ede5d3; }
.kb-white.root { fill: #f0d49a; }
.kb-black { fill: #1a2438; }
.kb-black.in-scale { fill: #1e3a5f; }
.kb-black.root { fill: #c8841e; }
.kb-label { font-family: var(--mono); font-size: 7px; font-weight: 700; }
.kb-label.on-white { fill: #1a2438; }
.kb-label.on-black { fill: #f6f1e7; }
.kb-label.root.on-white { fill: #a06912; }

/* =============================================================================
   Fullscreen modal
   ============================================================================= */

/* Native <dialog> backdrop */
.fs-modal::backdrop {
  background: rgba(26, 36, 56, 0.72);
  backdrop-filter: blur(3px);
}

.fs-modal {
  position: fixed;
  inset: 0;
  width: min(96vw, 1100px);
  max-height: 92vh;
  margin: auto;
  padding: 0;
  border: 1px solid var(--paper-rule);
  border-radius: var(--radius-card);
  background: var(--paper-card);
  box-shadow: 0 24px 80px rgba(26,36,56,0.35);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  animation: fs-in 180ms ease-out;
}
@keyframes fs-in {
  from { opacity: 0; transform: scale(0.97) translateY(8px); }
  to   { opacity: 1; transform: scale(1)    translateY(0);   }
}

.fs-header {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  padding: 1rem 1.25rem 0.875rem;
  border-bottom: 1px solid var(--paper-rule);
  flex-shrink: 0;
}
.fs-header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.fs-header-chords {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.3rem;
}
.fs-title {
  font-family: var(--serif);
  font-size: 1.5rem;
  font-weight: 500;
  font-variation-settings: "opsz" 24;
  color: var(--ink);
  margin: 0;
}
.fs-title .root { color: var(--amber-deep); font-weight: 600; }
.fs-concert {
  font-size: 0.85rem;
  color: var(--ink-faint);
  font-style: italic;
  margin-left: 0.5rem;
  letter-spacing: 0;
  text-transform: none;
}
.fs-close {
  width: 2rem;
  height: 2rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  background: transparent;
  color: var(--ink-faint);
  border: 1px solid transparent;
  border-radius: var(--radius);
  cursor: pointer;
  transition: color 120ms, background 120ms, border-color 120ms;
  flex-shrink: 0;
}
.fs-close:hover {
  color: var(--ink);
  background: var(--paper-deep);
  border-color: var(--paper-rule);
}

.fs-diagram {
  flex: 1;
  overflow: auto;
  padding: 1.5rem 2rem;
  background: #fefcf6;
  display: flex;
  align-items: center;
  justify-content: center;
}
.fs-diagram .diagram-svg {
  width: 100%;
  height: auto;
  max-height: 55vh;
}

.fs-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  padding: 0.875rem 1.25rem;
  border-top: 1px solid var(--paper-rule);
  flex-shrink: 0;
}

.fs-controls {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.75rem 1.25rem;
  border-top: 1px solid var(--paper-rule);
  background: var(--paper);
  flex-shrink: 0;
}
.fs-control-group {
  /* inherits .octave-count / .octave-shift layout from existing rules */
}
.fs-play-btn {
  margin-left: auto;
}

.fs-meta {
  padding: 0.75rem 1.25rem 1rem;
  border-top: 1px solid var(--paper-rule);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  flex-shrink: 0;
}
.fs-formula {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--ink-faint);
  letter-spacing: 0.05em;
}
.fs-desc {
  font-family: var(--sans);
  font-size: 0.82rem;
  color: var(--ink-soft);
  line-height: 1.5;
  margin: 0;
}

/* =============================================================================
   Footer
   ============================================================================= */
.colophon {
  border-top: var(--rule);
  padding: 2rem 1.5rem 3rem;
  text-align: center;
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.85rem;
  color: var(--ink-faint);
}
.colophon a {
  color: var(--ink-soft);
  text-decoration: underline;
  text-decoration-thickness: 0.5px;
  text-underline-offset: 3px;
}

/* =============================================================================
   Instrument-select title page  (v1.1.0)
   ============================================================================= */

/* ---------- Instrument select page ---------------------------------------- */

.instrument-select-page {
  max-width: 880px;
  margin: 1.5rem auto 3rem;
  padding: 0 1.5rem;
}

.instrument-select-inner {
  background: var(--paper-card);
  border: 1px solid var(--paper-rule);
  border-radius: var(--radius-card);
  padding: 2rem 2rem 1.5rem;
  box-shadow: 0 1px 0 var(--paper-rule), 0 12px 28px -22px rgba(26, 36, 56, 0.18);
}

.instrument-select-title {
  font-family: var(--serif);
  font-size: 1.9rem;
  font-weight: 500;
  color: var(--ink);
  margin: 0 0 0.4rem;
  letter-spacing: -0.01em;
  font-variation-settings: "opsz" 24;
}

.instrument-select-blurb {
  font-family: var(--sans);
  font-size: 0.95rem;
  color: var(--ink-soft);
  margin: 0 0 1.75rem;
  font-style: italic;
}

.instrument-family {
  margin-bottom: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--paper-rule);
}
.instrument-family:first-of-type {
  border-top: none;
  padding-top: 0;
}

.instrument-family-label {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin: 0 0 0.6rem;
}

.instrument-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.4rem 0.75rem;
}

.instrument-list-item { margin: 0; }

.instrument-pick {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.55rem 0.75rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-family: var(--sans);
  font-size: 0.92rem;
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
}
.instrument-pick:hover,
.instrument-pick:focus-visible {
  background: var(--paper-deep);
  border-color: var(--paper-rule);
  color: var(--ink);
  outline: none;
}
.instrument-pick:focus-visible {
  border-color: var(--amber);
}

.instrument-pick-icon {
  font-size: 1.15rem;
  line-height: 1;
  flex: 0 0 auto;
  width: 1.4rem;
  text-align: center;
}

.instrument-pick-label {
  flex: 1 1 auto;
  font-weight: 500;
}

/* ---------- "Change" button in the controls strip ------------------------- */


/* ---------- Concert-pitch toggle pill -------------------------------------- */

.concert-pitch-pill {
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.4rem 0.75rem;
  border: 1px solid var(--paper-rule);
  background: var(--paper-card);
  color: var(--ink-soft);
  border-radius: var(--radius);
  cursor: pointer;
  white-space: nowrap;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
}
.concert-pitch-pill:hover {
  background: var(--amber-wash);
  border-color: var(--amber);
  color: var(--amber-deep);
}
.concert-pitch-pill.concert-active,
.concert-pitch-pill[aria-pressed="true"] {
  background: var(--navy);
  color: var(--paper);
  border-color: var(--navy-deep);
}
.concert-pitch-pill.concert-active:hover {
  background: var(--navy-deep);
}



@media (max-width: 540px) {
  .instrument-select-page { padding: 0 1rem; }
  .instrument-select-inner { padding: 1.5rem 1.25rem 1rem; }
  .instrument-select-title { font-size: 1.55rem; }
  .instrument-list { grid-template-columns: 1fr; }
}

/* =============================================================================
   Print
   ============================================================================= */
@media print {
  body::before { display: none; }
  body { background: #fff; }
  .masthead, .controls, .colophon { display: none; }
  .booklet { padding: 0; }
  .grid { grid-template-columns: 1fr 1fr; gap: 0.5rem; }
  .card { box-shadow: none; break-inside: avoid; page-break-inside: avoid; }
}

/* =============================================================================
   Reduced motion
   ============================================================================= */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; }
}

/* =============================================================================
   Back-to-top button
   ============================================================================= */
.back-to-top {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 200;
  padding: 0.35rem 0.7rem;
  font-family: var(--sans);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: var(--navy);
  color: var(--paper);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  box-shadow: 0 2px 8px rgba(0,0,0,0.18);
  opacity: 0;
  pointer-events: none;
  transform: translateY(6px);
  transition: opacity 180ms ease, transform 180ms ease, background 120ms ease;
}
.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}
.back-to-top:hover {
  background: var(--navy-deep);
}
@media (prefers-reduced-motion: reduce) {
  .back-to-top { transition: none !important; }
}

/* =============================================================================
   Dark mode
   ============================================================================= */
body.dark {
  --paper:           #181c24;
  --paper-card:      #1e2330;
  --paper-deep:      #252b3a;
  --paper-rule:      #2e3648;

  --ink:             #e8e2d5;
  --ink-soft:        #a8b0c4;
  --ink-faint:       #6b748a;
  --ink-ghost:       #3e4660;

  --amber:           #d4923a;
  --amber-deep:      #e8a84e;
  --amber-soft:      #5a3a10;
  --amber-wash:      #2e2010;

  --navy:            #4a7ab5;
  --navy-deep:       #5a8ec8;

  --cat-basic:       #2e2a18;
  --cat-modes:       #22203a;
  --cat-mm:          #26203a;
  --cat-bebop:       #2e2818;
  --cat-blues:       #2e1e1e;
  --cat-pent:        #1e2a1a;
  --cat-sym:         #1e2a2a;
}
body.dark::before {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.92' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 0.05 0 0 0 0 0.07 0 0 0 0 0.1 0 0 0 0.06 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  mix-blend-mode: screen;
  opacity: 0.4;
}
body.dark select {
  background: var(--paper-card);
  color: var(--ink);
  border-color: var(--paper-rule);
}

/* Dark mode toggle button */
.dark-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.3rem 0.65rem;
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  background: transparent;
  color: var(--ink-soft);
  border: 1px solid var(--paper-rule);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 120ms ease, border-color 120ms ease, color 120ms ease;
  flex-shrink: 0;
}
.dark-toggle:hover {
  background: var(--paper-deep);
  border-color: var(--ink-ghost);
  color: var(--ink);
}
.dark-toggle .dark-toggle-icon {
  font-size: 0.85rem;
  line-height: 1;
}


/* =============================================================================
   Jazz Guidance — Chord Results
   ============================================================================= */
.chord-results-section {
  margin-bottom: 2rem;
}
.chord-results-section-header {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding: 0.5rem 0 0.5rem 0.75rem;
  border-left: 3px solid var(--paper-rule);
  margin-bottom: 1rem;
}
.chord-results-section-title {
  font-family: var(--sans);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.chord-results-section-desc {
  font-family: var(--serif);
  font-style: italic;
  font-size: 0.82rem;
  color: var(--ink-faint);
}

/* Section accent colors */
.fit-section-primary { border-color: #2a6e3a; }
.fit-section-primary .chord-results-section-title { color: #2a6e3a; }
.fit-section-color   { border-color: var(--amber); }
.fit-section-color   .chord-results-section-title { color: var(--amber-deep); }
.fit-section-outside { border-color: #7b4ea0; }
.fit-section-outside .chord-results-section-title { color: #7b4ea0; }
.fit-section-other   { border-color: var(--paper-rule); }
.fit-section-other   .chord-results-section-title { color: var(--ink-faint); }

.chord-results-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
@media (min-width: 700px)  { .chord-results-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .chord-results-grid { grid-template-columns: repeat(3, 1fr); } }

/* Fit badges */
.jazz-fit-badge {
  display: inline-block;
  font-family: var(--sans);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.15rem 0.45rem;
  border-radius: 2px;
  flex-shrink: 0;
  cursor: default;
}
.fit-primary { background: #d4edda; color: #2a6e3a; }
.fit-color   { background: var(--amber-wash); color: var(--amber-deep); }
.fit-outside { background: #ede0f5; color: #7b4ea0; }

/* Dark mode badge/guidance adjustments */
body.dark .fit-primary { background: #1a3d22; color: #6abf7a; }
body.dark .fit-color   { background: var(--amber-wash); color: var(--amber-deep); }
body.dark .fit-outside { background: #2e1a40; color: #c084e0; }
body.dark .fit-section-primary { border-color: #6abf7a; }
body.dark .fit-section-primary .chord-results-section-title { color: #6abf7a; }
body.dark .fit-section-outside { border-color: #c084e0; }
body.dark .fit-section-outside .chord-results-section-title { color: #c084e0; }