/* ────────────────────────────────────────────────────────────────────────
   Riffstation Reborn — styles
   Dark "studio" theme, neon-cyan accent, pitch-class color coding.
   ──────────────────────────────────────────────────────────────────────── */
:root{
  --bg:#0B0D12; --bg-2:#11141C; --panel:#161A24; --panel-2:#1C212D;
  --fg:#EEF1F6; --fg-2:#9AA2B1; --muted:#5C6473;
  --line:rgba(255,255,255,.08); --line-2:rgba(255,255,255,.04);
  --accent:#5AC8FA; --accent-2:#7CF0C8; --warn:#FF8C5A; --good:#5BE59A;
  --ease:cubic-bezier(.2,.8,.2,1);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%}
body{
  background:radial-gradient(1200px 700px at 70% -10%,#16203a 0%,var(--bg) 55%) fixed;
  color:var(--fg);
  font:15px/1.5 ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  display:flex;flex-direction:column;min-height:100dvh;
  padding-bottom:env(safe-area-inset-bottom);
}

/* ── topbar ── */
.topbar{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 20px;border-bottom:1px solid var(--line);
  position:sticky;top:0;backdrop-filter:blur(12px);
  background:linear-gradient(180deg,rgba(11,13,18,.85),rgba(11,13,18,.55));z-index:5;
}
.brand{display:flex;align-items:center;gap:10px;font-weight:600;letter-spacing:.2px}
.logo{color:var(--accent);font-size:20px;filter:drop-shadow(0 0 8px rgba(90,200,250,.5))}
.brandName em{font-style:normal;color:var(--accent-2);font-weight:500}
.tabs{display:flex;gap:6px;background:var(--panel);padding:4px;border-radius:12px;border:1px solid var(--line)}
.tab{
  appearance:none;border:0;background:transparent;color:var(--fg-2);
  padding:7px 16px;border-radius:9px;font:inherit;font-weight:600;cursor:pointer;transition:.18s var(--ease);
}
.tab.on{background:var(--accent);color:#062330}
.tab:not(.on):hover{color:var(--fg)}

.view{flex:1;width:100%;max-width:920px;margin:0 auto;padding:24px 20px 40px}

/* ── dropzone ── */
.dropzone{
  border:1.5px dashed var(--line);border-radius:18px;background:var(--bg-2);
  padding:54px 24px;text-align:center;cursor:pointer;transition:.2s var(--ease);
}
.dropzone:hover,.dropzone.over{border-color:var(--accent);background:var(--panel)}
.dzIcon{font-size:40px;color:var(--accent);margin-bottom:12px;filter:drop-shadow(0 0 14px rgba(90,200,250,.45))}
.dzTitle{font-size:20px;font-weight:600}
.dzHint{color:var(--muted);margin-top:6px;font-size:13px}

/* ── stage (hidden until a song is loaded) ── */
.stage{display:none}
body.loaded .dropzone{display:none}
body.loaded .stage{display:block;animation:rise .4s var(--ease)}
@keyframes rise{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:none}}

.stageHead{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:18px}
.songName{font-size:22px;font-weight:700}
.songMeta{color:var(--muted);font-size:13px;margin-top:2px}
.ghost{
  appearance:none;background:var(--panel);border:1px solid var(--line);color:var(--fg-2);
  padding:8px 14px;border-radius:10px;font:inherit;font-weight:600;cursor:pointer;transition:.16s var(--ease);
}
.ghost:hover{color:var(--fg);border-color:var(--accent)}

/* ── now row: current chord + diagram + spectrum ── */
.nowRow{
  display:grid;grid-template-columns:1fr 130px 1fr;gap:18px;align-items:center;
  background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:20px;margin-bottom:14px;
}
.nowChord{font-size:60px;font-weight:800;line-height:1;letter-spacing:-1px;color:var(--accent)}
.nextChord{color:var(--muted);font-size:14px;margin-top:8px;min-height:18px}
.diagram{width:130px;height:160px;color:var(--fg);display:flex;align-items:center;justify-content:center}
.diagram .noShape{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;
  color:var(--fg-2);font-size:22px;font-weight:700}
.diagram .noShape span{font-size:11px;font-weight:500;color:var(--muted);margin-top:6px}
.spectrum{width:100%;height:96px;border-radius:10px;background:rgba(0,0,0,.25)}

/* ── analysis bar ── */
.analysis{display:none;align-items:center;gap:10px;color:var(--fg-2);font-size:13px;margin-bottom:12px}
.analysis.on{display:flex}
.analysisBar{height:4px;flex:1;background:var(--accent);border-radius:3px;width:0;transition:width .2s linear;
  box-shadow:0 0 10px rgba(90,200,250,.6)}

/* ── waveform + chord lane ── */
.waveform{width:100%;height:120px;display:block;border-radius:12px;background:rgba(0,0,0,.28);
  border:1px solid var(--line);cursor:crosshair;touch-action:none}
.chordlane{width:100%;height:38px;display:block;margin-top:8px;border-radius:10px;
  background:rgba(0,0,0,.28);border:1px solid var(--line);cursor:pointer}

/* ── transport ── */
.transport{display:flex;align-items:center;gap:14px;margin:18px 0 6px}
.play{
  width:54px;height:54px;border-radius:50%;border:0;background:var(--accent);color:#062330;
  font-size:20px;cursor:pointer;display:grid;place-items:center;transition:.16s var(--ease);
  box-shadow:0 6px 20px rgba(90,200,250,.35);
}
.play:hover{transform:scale(1.06)}
.time{font-variant-numeric:tabular-nums;color:var(--fg-2);font-weight:600;min-width:96px}
.loop{
  appearance:none;background:var(--panel);border:1px solid var(--line);color:var(--fg-2);
  padding:9px 14px;border-radius:10px;font:inherit;font-weight:600;cursor:pointer;transition:.16s var(--ease);
}
.loop.on{background:rgba(90,200,250,.16);border-color:var(--accent);color:var(--accent)}
.loopInfo{color:var(--muted);font-size:13px;margin-left:auto;font-variant-numeric:tabular-nums}

/* ── controls ── */
.controls{
  display:grid;grid-template-columns:1fr 1fr auto;gap:18px;align-items:end;
  background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:18px;margin-top:14px;
}
.ctrl label{display:block;font-weight:600;font-size:13px;color:var(--fg-2);margin-bottom:10px}
.ctrl .val{color:var(--accent);font-weight:700}
.ctrl .unit{color:var(--muted);font-weight:500}
.ctrlHint{color:var(--muted);font-size:12px;margin-top:8px}
.reset{height:40px}
input[type=range]{
  -webkit-appearance:none;width:100%;height:6px;border-radius:4px;
  background:linear-gradient(90deg,var(--accent),var(--accent-2));outline:none;
}
input[type=range]::-webkit-slider-thumb{
  -webkit-appearance:none;width:20px;height:20px;border-radius:50%;background:#fff;cursor:pointer;
  box-shadow:0 2px 8px rgba(0,0,0,.5);border:2px solid var(--accent);
}
input[type=range]::-moz-range-thumb{width:18px;height:18px;border-radius:50%;background:#fff;border:2px solid var(--accent);cursor:pointer}

/* ── tuner ── */
.tuner{max-width:480px;margin:10px auto 0;text-align:center}
.tunerNoteWrap{margin-bottom:4px}
.noteBig{font-size:96px;font-weight:800;line-height:1;letter-spacing:-2px}
.tNote{transition:color .2s}
.tNote.inTune{color:var(--good);text-shadow:0 0 26px rgba(91,229,154,.55)}
.tOct{font-size:30px;color:var(--muted);font-weight:600}
.tCents{font-size:18px;font-weight:700;color:var(--fg-2);font-variant-numeric:tabular-nums;min-height:24px}
.tFreq{color:var(--muted);font-size:13px;min-height:18px}
.dial{width:100%;height:160px;display:block}
.tunerChordWrap{margin-top:18px}
.tcLabel{color:var(--muted);font-size:12px;text-transform:uppercase;letter-spacing:1.5px}
.tChord{font-size:46px;font-weight:800;color:var(--accent);line-height:1.1}
.chroma{width:100%;height:230px;display:block;margin:6px auto 16px}
.mic{
  appearance:none;border:0;background:var(--accent);color:#062330;font:inherit;font-weight:700;
  padding:13px 26px;border-radius:12px;cursor:pointer;transition:.16s var(--ease);
  box-shadow:0 6px 20px rgba(90,200,250,.3);
}
.mic:hover{transform:translateY(-1px)}
body.listening .mic{background:var(--warn);box-shadow:0 6px 20px rgba(255,140,90,.35)}
.micState{color:var(--muted);font-size:13px;margin-top:12px}

/* ── footer ── */
.foot{
  text-align:center;color:var(--muted);font-size:12px;padding:18px 20px 26px;border-top:1px solid var(--line-2);
}

/* ── beat dot + grid/metronome controls ── */
.beatDot{width:14px;height:14px;border-radius:50%;background:var(--line);flex:0 0 auto;transition:none}
.beatDot.on{background:var(--accent);box-shadow:0 0 10px var(--accent);animation:beatPop .18s var(--ease)}
.beatDot.on.down{background:var(--accent-2);box-shadow:0 0 14px var(--accent-2);transform:scale(1.15)}
@keyframes beatPop{from{transform:scale(1.5)}to{transform:scale(1)}}
.loop:disabled{opacity:.4;cursor:not-allowed}
.barSel{
  appearance:none;background:var(--panel);border:1px solid var(--line);color:var(--fg-2);
  padding:9px 12px;border-radius:10px;font:inherit;font-weight:600;cursor:pointer;
}
.transport{flex-wrap:wrap}

/* ── shared view headers ── */
.vh{font-size:20px;font-weight:700;margin:0 0 4px}
.vsub{color:var(--fg-2);font-size:14px;margin:0 0 18px}

/* ── pick rows (root / quality buttons) ── */
.pickRow{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px}
.pick{
  appearance:none;background:var(--panel);border:1px solid var(--line);color:var(--fg-2);
  min-width:42px;padding:9px 12px;border-radius:10px;font:inherit;font-weight:700;cursor:pointer;transition:.14s var(--ease);
}
.pick:hover{color:var(--fg);border-color:var(--accent)}
.pick.on{background:var(--accent);color:#062330;border-color:var(--accent)}
.qualities .pick{font-weight:600;font-size:13px;min-width:0}

/* ── chord lookup result ── */
.chordResult{margin-top:20px}
.resHead{display:flex;align-items:baseline;gap:14px;margin-bottom:16px;flex-wrap:wrap}
.resName{font-size:40px;font-weight:800;color:var(--accent);line-height:1}
.resNotes{color:var(--fg-2);font-weight:600;font-variant-numeric:tabular-nums}
.voicings{display:flex;flex-wrap:wrap;gap:18px}
.voicing{margin:0;text-align:center}
.voicing .vd{width:120px;height:152px;color:var(--fg);background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:6px}
.voicing figcaption{color:var(--fg-2);font-size:12px;font-weight:600;margin-top:8px}
.noShape{color:var(--muted);padding:30px}

/* ── learn ── */
.learnGrid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:18px}
.card.span2{grid-column:1 / -1}
.sel{
  appearance:none;background:var(--bg-2);border:1px solid var(--line);color:var(--fg);
  padding:10px 14px;border-radius:10px;font:inherit;font-weight:600;cursor:pointer;margin-bottom:14px;width:100%;
}
.scaleNotes{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:16px}
.sn{background:var(--chip,rgba(255,255,255,.05));border:1px solid var(--line);border-radius:8px;padding:6px 11px;font-weight:700}
.sn.root{background:var(--accent-2);color:#062330;border-color:var(--accent-2)}
.fretboard{color:var(--fg);background:rgba(0,0,0,.25);border-radius:12px;padding:8px}
.diatonic{display:flex;flex-wrap:wrap;gap:8px}
.diaChord{
  display:flex;flex-direction:column;align-items:center;gap:2px;cursor:pointer;
  background:var(--bg-2);border:1px solid var(--line);border-radius:10px;padding:9px 13px;color:var(--fg);transition:.14s var(--ease);
}
.diaChord:hover{border-color:var(--accent);transform:translateY(-1px)}
.diaChord .rom{font-size:11px;color:var(--muted);font-weight:600;letter-spacing:.5px}
.diaChord .dn{font-size:16px;font-weight:700}
.diaChord.used{border-color:var(--accent);background:rgba(90,200,250,.12)}
.diaChord.used .dn{color:var(--accent)}
.circle{max-width:280px;margin:0 auto}
.circle .ck circle{fill:var(--bg-2);stroke:var(--line);stroke-width:1;cursor:pointer;transition:.14s}
.circle .ck text{fill:var(--fg-2);font-size:13px;font-weight:700;pointer-events:none}
.circle .ck:hover circle{stroke:var(--accent)}
.circle .ck.on circle{fill:var(--accent)}
.circle .ck.on text{fill:#062330}
.songKey .bigKey{font-size:34px;font-weight:800;color:var(--accent-2)}
.songKey .conf{color:var(--fg-2);font-size:13px;margin:2px 0 14px;font-variant-numeric:tabular-nums}
.diaSong{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:10px}
.hint{color:var(--muted);font-size:12px}

/* ── responsive ── */
@media(max-width:640px){
  .learnGrid{grid-template-columns:1fr}
  .card.span2{grid-column:auto}
  .nowRow{grid-template-columns:1fr;text-align:center;gap:14px}
  .nowChord{font-size:48px}
  .diagram{margin:0 auto}
  .controls{grid-template-columns:1fr;gap:14px}
  .reset{width:100%}
  .noteBig{font-size:72px}
}