:root {
  --bg:       #080810;
  --surface:  rgba(13, 13, 26, 0.85);
  --s2:       #131322;
  --s3:       #191928;
  --border:   #1e1e38;
  --text:     #dcdcf5;
  --muted:    #4e4e90;
  --root-c:   #f59e0b;
  --root-g:   rgba(245,158,11,.5);
  --note-c:   #22d3ee;
  --note-g:   rgba(34,211,238,.4);
  --accent:   #7c3aed;
  --neck-bd:  #1e1e38;
  --neck-bg1: #151522;
  --neck-bg2: #1e1e2d;
}

/* ════ LIGHT MODE ════ */
[data-theme="light"] {
  --bg:       #f8f9fb;
  --surface:  rgba(255,255,255,0.95);
  --s2:       #eef2f6;
  --s3:       #e2e8f0;
  --border:   #cbd5e1;
  --text:     #1e293b;
  --muted:    #64748b;
  --root-c:   #ea580c;
  --root-g:   rgba(234,88,12,.3);
  --note-c:   #0ea5e9;
  --note-g:   rgba(14,165,233,.25);
  --accent:   #8b5cf6;
  --neck-bd:  #94a3b8;
  --neck-bg1: #e2e8f0;
  --neck-bg2: #f1f5f9;
}
[data-theme="light"] .app {
  background: radial-gradient(circle at top center, #e2e8f0, var(--bg) 55%) !important;
}
[data-theme="light"] .nd.sn { background: var(--note-c); color: #fff; }
[data-theme="light"] .nd.rn { background: var(--root-c); color: #fff; }
[data-theme="light"] body { background: var(--bg); }
[data-theme="light"] .p.on { color: #fff; }
[data-theme="light"] .fb-str::before { background: var(--neck-bd); opacity: 0.5; }
[data-theme="light"] .fb-dot { background: #94a3b8; box-shadow: 0 0 4px rgba(100,116,139,.3); border-color:#e2e8f0; }

[data-theme="light"] .scale-info,
[data-theme="light"] .pos-bar,
[data-theme="light"] .quiz-panel,
[data-theme="light"] .metro-panel {
  background: rgba(255, 255, 255, 0.6);
}
[data-theme="light"] .tour-tooltip {
  background: #ffffff;
  border-color: var(--accent);
}
[data-theme="light"] .tour-title { color: var(--accent); }

/* Riduzione ombre per la light mode */
[data-theme="light"] .fb-labels { box-shadow: 6px 0 10px -4px rgba(100, 116, 139, 0.1); }
[data-theme="light"] .fb-neck { box-shadow: 0 12px 30px rgba(100, 116, 139, 0.1), inset 0 2px 4px rgba(255,255,255,0.6); }
[data-theme="light"] .fb-sl { box-shadow: 0 2px 4px rgba(100, 116, 139, 0.15); }
[data-theme="light"] .fb-nut { box-shadow: 2px 0 4px rgba(100, 116, 139, 0.15); }
[data-theme="light"] .fb-wire { box-shadow: 1px 0 2px rgba(100, 116, 139, 0.1); }

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg); color: var(--text); font-family: 'Inter', system-ui, sans-serif; overflow-x: hidden; }

/* ── APP SHELL ── */
.app { display: flex; flex-direction: column; min-height: 100vh; background: radial-gradient(circle at top center, #1a1a3a, var(--bg) 60%); }

/* ══════════════════════════════
   TOP DASHBOARD
══════════════════════════════ */
.top-dashboard {
  background: var(--surface);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  flex-direction: column;
  padding: 12px 28px;
  gap: 12px;
}

/* MODALITÀ MINIMALE PER PAGINE SECONDARIE */
body.minimal-header .td-actions,
body.minimal-header .td-row-root,
body.minimal-header .td-row-scales {
  display: none !important;
}
body.minimal-header .top-dashboard {
  padding-bottom: 12px;
}

.td-row {
  display: flex;
  align-items: center;
  gap: 20px;
}
.row-label {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--muted);
  width: 110px;
  flex-shrink: 0;
}

/* RIGA 1 - HEADER PRINCIPALE */
.td-row-main { justify-content: space-between; border-bottom: 1px solid rgba(255,255,255,0.05); padding-bottom: 12px; flex-wrap:wrap; }

.sb-logo { display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
.logo-icon { width: 32px; height: 32px; background: linear-gradient(135deg, var(--accent), #0891b2); border-radius: 8px; display: grid; place-items: center; font-size: 18px; box-shadow: 0 0 16px rgba(124,58,237,.4); }
.logo-text { font-size: 14px; font-weight: 900; letter-spacing: -.2px; line-height: 1.1; }
.logo-text small { display: block; font-size: 10px; font-weight: 400; color: var(--muted); }

/* CONTROLS (TENDINE & BTN) */
.td-actions { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }

.sel-wrap {
  display: flex; align-items: center; gap: 6px;
}
.sel-wrap span { font-size: 10px; color: var(--muted); font-weight: 700; text-transform:uppercase; letter-spacing: 1px; }
.sel-wrap select {
  background: var(--s3); border: 1px solid var(--border); color: var(--text); border-radius: 6px;
  padding: 4px 8px; font-size: 12px; font-family: 'Space Mono', monospace;
  outline: none; cursor: pointer; transition: 0.2s;
}
.sel-wrap select:hover { border-color: var(--accent); }

/* pill base */
.p {
  background: var(--s3); border: 1px solid var(--border); color: var(--muted);
  padding: 4px 10px; border-radius: 100px; font-size: 12px; font-family: 'Space Mono', monospace;
  cursor: pointer; transition: all .2s; user-select: none; white-space: nowrap;
}
.p:hover { border-color: var(--accent); color: var(--text); transform: translateY(-1px); }
.p:active { transform: translateY(1px); }
.p.on { background: var(--accent); border-color: var(--accent); color: #fff; font-weight: 700; box-shadow: 0 4px 12px rgba(124,58,237,.35); }

/* icon btns */
.icon-btn { display: flex; align-items: center; justify-content: center; width: 30px; height: 30px; border-radius: 6px; cursor: pointer; border: 1px solid var(--border); transition: 0.2s;text-decoration:none;font-size:14px; }
.icon-btn:hover { transform: translateY(-2px); }
.icon-btn:active { transform: translateY(1px); }
.donate-btn-sm { background: rgba(245, 158, 11, 0.1); border-color: rgba(245, 158, 11, 0.4); color: var(--root-c); }
.donate-btn-sm:hover { background: rgba(245, 158, 11, 0.3); border-color: var(--root-c); box-shadow: 0 4px 12px rgba(245,158,11,.2); }
.export-btn-sm { background: var(--s3); color: var(--muted); }
.export-btn-sm:hover { color: var(--text); border-color: var(--accent); background: var(--s2); box-shadow: 0 4px 12px rgba(124,58,237,.2); }

.lang-ctrl { display: flex; gap: 4px; }
.lang-ctrl .p { padding: 3px 6px; font-size: 10.5px; border-radius: 4px; }

/* RIGA 2 - ROOT & SCALES GRID */
.hz-grid { display: flex; flex-wrap: wrap; gap: 6px; flex: 1; }
.hz-grid .p { font-size: 11px; padding: 4px 8px; }

/* RIGA 3 - SCALES TABS */
.td-row-scales { align-items: flex-start; }
.sg-tabs { display: flex; }
.sg-tab {
  background: var(--s3); border: 1px solid var(--border); color: var(--muted);
  padding: 5px 12px; font-size: 11px; font-family: 'Space Mono', monospace;
  cursor: pointer; transition: all .1s; user-select: none; text-align: center;
}
.sg-tab:hover { color: var(--text); }
.sg-tab:first-child { border-radius: 6px 0 0 6px; }
.sg-tab:last-child  { border-radius: 0 6px 6px 0; border-left: none; }
.sg-tab:not(:first-child):not(:last-child) { border-left: none; }
.sg-tab.on { background: var(--s2); color: var(--text); border-color: var(--accent); position: relative; z-index: 1; box-shadow: 0 2px 8px rgba(124,58,237,.2); font-weight:700;}

.panels-hz { flex: 1; }
.sg-panel { display: none; flex-wrap: wrap; gap: 6px; animation: fadeIn .3s ease; }
@keyframes fadeIn { from{opacity:0;transform:translateY(4px)} to{opacity:1;transform:translateY(0)} }
.sg-panel.show { display: flex; }
.sg-panel .p { font-size: 11px; padding: 4px 10px; }

/* ══════════════════════════════
   MAIN
══════════════════════════════ */
.main { flex: 1; display: flex; flex-direction: column; width: 100%; }

.scale-info {
  background: rgba(13,13,26,0.4); border-bottom: 1px solid var(--border);
  padding: 18px 28px; display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
}
.si-left { min-width: 180px; }
.si-name { font-size: 20px; font-weight: 900; letter-spacing: -.4px; }
.si-sub  { font-size: 11px; color: var(--muted); font-family: 'Space Mono', monospace; margin-top: 3px; }

.notes-row { display: flex; gap: 7px; flex-wrap: wrap; }
.nb { display: flex; flex-direction: column; align-items: center; gap: 3px; transition: transform .2s; }
.nb:hover { transform: translateY(-2px); }
.nb-n {
  padding: 4px 10px; border-radius: 6px; font-family: 'Space Mono', monospace; font-size: 12.5px; font-weight: 700;
  background: rgba(34,211,238,.08); color: var(--note-c); border: 1px solid rgba(34,211,238,.2); box-shadow: 0 2px 8px rgba(34,211,238,.05);
}
.nb.root .nb-n { background: rgba(245,158,11,.09); color: var(--root-c); border-color: rgba(245,158,11,.28); box-shadow: 0 2px 8px rgba(245,158,11,.1); }
.nb-d { font-size: 9.5px; color: var(--muted); font-family: 'Space Mono', monospace; }

/* pos-bar */
.pos-bar { padding: 10px 28px; background: rgba(13,13,26,0.3); border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 12px; font-size: 12px; color: var(--muted); }
.pos-bar.hide { display: none; }
.pos-nav { background: var(--s3); border: 1px solid var(--border); color: var(--muted); padding: 3px 12px; border-radius: 100px; font-size: 12px; font-family: 'Space Mono', monospace; cursor: pointer; transition: all .2s; }
.pos-nav:hover { color: var(--text); border-color: var(--accent); transform: scale(1.05); }
.pos-nav:active { transform: scale(0.95); }
.pos-txt { font-family: 'Space Mono', monospace; }

/* fretboard */
.fb-area { padding: 32px 28px 16px; overflow-x: auto; flex: 1; }
.fb-area::-webkit-scrollbar { height: 8px; }
.fb-area::-webkit-scrollbar-track { background: var(--bg); border-radius: 4px; }
.fb-area::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
.fb-area::-webkit-scrollbar-thumb:hover { background: var(--muted); }

.fb-layout { display: flex; align-items: stretch; width: max-content; }
.fb-labels { 
  display: flex; flex-direction: column; padding-right: 15px; padding-top: 24px; 
  position: sticky; left: 0; background: var(--bg); z-index: 10;
  box-shadow: 10px 0 15px -5px rgba(0,0,0,0.5);
}
.fb-lbl { height: var(--fh, 46px); display: flex; align-items: center; justify-content: flex-end; font-family: 'Space Mono', monospace; font-size: 13.5px; font-weight: 700; color: var(--note-c); text-shadow: 0 0 10px var(--note-g); }

.fb-main { display: flex; flex-direction: column; }
.fb-main.lefty { transform: scaleX(-1); }
.fb-main.lefty .fb-n { transform: scaleX(-1); }
.fb-main.lefty .nd span { transform: scaleX(-1); }

.fb-nums { display: flex; height: 20px; opacity: 0.8; margin-left:60px;}
.fb-n { width: var(--fw, 60px); text-align: center; font-size: 10.5px; font-family: 'Space Mono', monospace; color: var(--muted); line-height: 20px; }
.fb-n.z { color: transparent; width:0; overflow:hidden;} /* Hide zero offset if unneeded */

.fb-neck {
  position: relative; background: linear-gradient(170deg, var(--neck-bg1) 0%, var(--neck-bg2) 45%, var(--neck-bg1) 100%);
  border: 1px solid var(--neck-bd); border-radius: 0 5px 5px 0; box-shadow: 0 16px 40px rgba(0,0,0,0.6), inset 0 2px 4px rgba(255,255,255,0.02);
}
.fb-nut { position: absolute; left: var(--fw, 60px); top: 0; bottom: 0; width: 5px; background: linear-gradient(180deg,#334,#445,#334); z-index: 4; box-shadow: 2px 0 4px rgba(0,0,0,0.5); }
.fb-wire { position: absolute; top: 8px; bottom: 8px; width: 2px; background: linear-gradient(180deg,#445,#667,#445); z-index: 2; box-shadow: 2px 0 3px rgba(0,0,0,0.4); }
.fb-dot { 
  position: absolute; bottom: 8px; width: 10px; height: 10px; 
  background: #dcdcf5; border: 1px solid #ffffff; border-radius: 50%; 
  transform: translateX(-50%); z-index: 1; 
  box-shadow: inset 0 1px 2px rgba(0,0,0,0.4), 0 0 10px rgba(220,220,245,0.3);
  opacity: 0.6;
}

.fb-strings { position: relative; z-index: 3; }
.fb-str { position: relative; height: var(--fh, 46px); }
.fb-sl { position: absolute; left: 0; right: 0; top: 50%; transform: translateY(-50%); background: linear-gradient(180deg, #667, #889, #556); box-shadow: 0 4px 6px rgba(0,0,0,0.6); }

.nd {
  position: absolute; top: 50%; transform: translate(-50%,-50%); width: var(--ds, 34px); height: var(--ds, 34px); border-radius: 50%;
  display: flex; align-items: center; justify-content: center; font-family: 'Space Mono', monospace; font-size: 11px; font-weight: 700;
  z-index: 6; cursor: pointer; transition: all .15s cubic-bezier(0.4, 0, 0.2, 1);
}
.nd span { display: inline-block; }
.nd:hover { transform: translate(-50%,-50%) scale(1.2); filter: brightness(1.2); z-index: 10; }
.nd:active { transform: translate(-50%,-50%) scale(0.95); }
.nd.playing { transform: translate(-50%,-50%) scale(1.3); filter: brightness(1.5); }
.nd.sn { background: var(--note-c); color: #080810; box-shadow: 0 4px 16px var(--note-g); }
.nd.rn { background: var(--root-c); color: #080810; box-shadow: 0 4px 20px var(--root-g); font-size: 12px; }

/* legend and footer */
.legend { padding: 12px 28px 32px; display: flex; gap: 20px; flex-wrap: wrap; }
.li { display: flex; align-items: center; gap: 7px; font-size: 12px; color: var(--muted); }
.ld { width: 14px; height: 14px; border-radius: 50%; box-shadow: 0 2px 8px rgba(0,0,0,0.5); }

footer { padding: 20px 28px; text-align: center; border-top: 1px solid var(--border); color: var(--muted); font-size: 11px; margin-top: auto; }

/* ══════════════════════════════
   PRINT
══════════════════════════════ */
@media print {
  @page { size: landscape; margin: 1cm; }
  * { -webkit-print-color-adjust: exact !important; print-color-adjust: exact !important; }
  .top-dashboard, .pos-bar, .legend, footer { display: none !important; }
  .app { display: block; background: #fff; }
  .main { width: 100%; }
  body { background: #fff; color: #111; }
  .scale-info { background: #fff; border: 1px solid #ddd; padding: 16px 20px; }
  .si-name { color: #111; }
  .si-sub  { color: #666; }
  .nb-n { background: #e0f7fb; color: #0e7490; border-color: #0e7490; box-shadow:none; }
  .nb.root .nb-n { background: #fef3c7; color: #b45309; border-color: #b45309; box-shadow:none; }
  .nb-d { color: #888; }
  .fb-area { padding: 20px; overflow: visible; }
  .fb-neck { background: #fff; border: 1px solid #ccc; box-shadow: none; }
  .fb-nut  { background: #999; box-shadow:none; }
  .fb-wire { background: #aaa; box-shadow:none; }
  .fb-sl   { background: #bbb !important; box-shadow:none; }
  .fb-dot  { background: #eee; border-color:#ccc; box-shadow:none; }
  .fb-lbl  { color: #555; }
  .fb-n    { color: #888; }
  .nd.sn   { background: #0e7490; color: #fff; box-shadow: none; }
  .nd.rn   { background: #b45309; color: #fff; box-shadow: none; }
}

@media (max-width: 860px) {
  .top-dashboard { padding: 8px 16px; }
  .td-row { flex-direction: column; align-items: flex-start; gap: 6px;}
  .td-actions { flex-wrap: wrap; width:100%; gap: 10px; }
  .row-label { width: 100%; margin-bottom: 2px; }
  .sg-tabs { flex-wrap: wrap; width: 100%; }
  .sg-tab { flex: 1; border-radius: 6px !important; margin:2px; border-left:1px solid var(--border) !important; text-align: center; }
}

@media (max-width: 600px) {
  .logo-text { font-size: 16px; }
  .logo-text small { display: none; }
  .td-icons { width: 100%; justify-content: space-between; padding-top: 8px; border-top: 1px solid rgba(255,255,255,0.05); }
  
  /* Area Tocco */
  .p { padding: 8px 12px; font-size: 13px; min-width: 44px; text-align: center; }
  .icon-btn { width: 40px; height: 40px; font-size: 18px; }
  
  .hz-grid { gap: 6px; justify-content: space-around; }
  .nb-n { padding: 6px 12px; font-size: 14px; }
  
  .si-name { font-size: 18px; }
  .si-sub { font-size: 10px; }
  
  body.minimal-header .top-dashboard { gap: 4px; }
}

/* QUIZ UI */
.quiz-panel { display: none; text-align: center; margin-top: 20px; margin-bottom: 30px; }
.quiz-panel.show { display: block; }
.quiz-score { font-size: 26px; font-weight: 900; margin-bottom: 24px; font-family: 'Space Mono', monospace; color: var(--accent); }
.quiz-btns { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px; max-width: 500px; margin: 0 auto; }
.quiz-btn {
  padding: 12px 18px; border-radius: 8px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font-weight: bold; cursor: pointer; transition: transform 0.1s, background 0.2s; font-size: 15px; font-family: 'Space Mono', monospace; min-width: 55px;
}
.quiz-btn:hover { background: var(--root-c); color: #000; border-color: var(--root-c); transform: translateY(-2px); }
.quiz-btn:active { transform: translateY(0); }

@media (max-width: 600px) {
  .quiz-btn { padding: 16px 20px; font-size: 18px; flex: 1 1 30%; }
  .quiz-score { font-size: 20px; }
  .legend { padding: 12px 16px; justify-content: space-between; gap: 10px; }
  .li { font-size: 10px; }
}
.quiz-btn.wrong { background: #ef4444; color: #fff; border-color: #ef4444; animation: shake 0.3s; }
.quiz-btn.correct { background: #10b981; color: #fff; border-color: #10b981; }

.nd.q-dot { background: #ef4444 !important; box-shadow: 0 0 15px #ef4444 !important; opacity: 1 !important; z-index: 10; cursor: default; }
.nd.q-dot span { display: none !important; }

/* === QUIZ ARCADE HUD === */
.quiz-hud {
  max-width: 600px; margin: 0 auto 16px; 
  background: var(--s2); border: 1px solid var(--border); border-radius: 12px;
  overflow: hidden; box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}
.quiz-timer-bar { height: 6px; background: rgba(0,0,0,0.3); width: 100%; position: relative; }
.quiz-timer-fill {
  height: 100%; width: 100%; background: linear-gradient(90deg, #10b981, #22d3ee);
  transition: width 1s linear; transform-origin: left;
}
.quiz-timer-fill.urgent { background: linear-gradient(90deg, #ef4444, #f59e0b); }

.quiz-hud-row { display: flex; justify-content: space-between; align-items: center; padding: 12px 20px; }
.quiz-score { font-size: 20px; font-weight: 900; color: #f59e0b; font-family: 'Space Mono', monospace; }
.quiz-combo { font-size: 14px; font-weight: 800; color: #10b981; transition: all .2s; }
.quiz-combo.pop { transform: scale(1.4); color: #22d3ee; }
.quiz-time { font-size: 16px; font-weight: 700; color: var(--text); font-family: 'Space Mono', monospace; }

.quiz-ctrl-btn {
  background: var(--surface); border: 1px solid var(--border); color: var(--text);
  padding: 6px 14px; border-radius: 6px; font-size: 12px; font-weight: 700;
  cursor: pointer; transition: all .2s; outline: none;
}
.quiz-ctrl-btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.quiz-ctrl-btn:active { transform: translateY(0); }
@keyframes shake {
  0% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  50% { transform: translateX(4px); }
  75% { transform: translateX(-4px); }
  100% { transform: translateX(0); }
}

/* ══════════════════════════════
   METRONOME UI
══════════════════════════════ */
.metro-panel {
  display: none;
  padding: 20px 28px;
  background: rgba(8, 8, 20, 0.7);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
}
.metro-panel.show { display: block; animation: fadeIn .3s ease; }

.metro-ui {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  max-width: 420px;
  margin: 0 auto;
}

/* Beat dots */
.metro-beats { display: flex; gap: 14px; align-items: center; }
.metro-beat-dot {
  width: 32px; height: 32px; border-radius: 50%;
  border: 2px solid var(--border);
  background: var(--s3);
  transition: background .04s, box-shadow .04s, transform .04s;
}
.metro-beat-dot.accent { border-color: var(--root-c); }
.metro-beat-dot.lit {
  background: var(--note-c);
  box-shadow: 0 0 22px var(--note-g);
  transform: scale(1.2);
}
.metro-beat-dot.lit.accent {
  background: var(--root-c);
  box-shadow: 0 0 26px var(--root-g);
  transform: scale(1.3);
}

/* BPM row */
.metro-bpm-row { display: flex; align-items: center; gap: 20px; }
.metro-bpm-center { display: flex; flex-direction: column; align-items: center; min-width: 90px; }
.metro-bpm-num {
  font-size: 58px; font-weight: 900; font-family: 'Space Mono', monospace;
  color: var(--text); line-height: 1; transition: color .2s;
}
.metro-bpm-label {
  font-size: 11px; font-weight: 700; letter-spacing: 3px;
  text-transform: uppercase; color: var(--muted); margin-top: 2px;
}
.metro-bpm-btn {
  width: 44px; height: 44px; border-radius: 50%;
  border: 2px solid var(--border); background: var(--s3);
  color: var(--text); font-size: 24px; line-height: 1;
  cursor: pointer; transition: all .15s; font-weight: 900;
  display: flex; align-items: center; justify-content: center;
}
.metro-bpm-btn:hover { border-color: var(--accent); background: var(--s2); transform: scale(1.12); }
.metro-bpm-btn:active { transform: scale(0.92); }

/* Slider */
.metro-slider {
  width: 100%; max-width: 320px;
  -webkit-appearance: none; appearance: none;
  height: 6px; border-radius: 3px;
  background: var(--border); outline: none; cursor: pointer;
}
.metro-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 20px; height: 20px; border-radius: 50%;
  background: var(--accent); cursor: pointer;
  box-shadow: 0 0 10px rgba(124,58,237,.6);
  transition: transform .15s;
}
.metro-slider::-webkit-slider-thumb:hover { transform: scale(1.2); }

/* Controls row */
.metro-controls { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; justify-content: center; }
.metro-sig-label {
  display: flex; align-items: center; gap: 8px;
  font-size: 11px; color: var(--muted); font-weight: 700; text-transform: uppercase; letter-spacing: 1px;
}
.metro-sig-label select {
  background: var(--s3); border: 1px solid var(--border);
  color: var(--text); border-radius: 6px;
  padding: 5px 10px; font-size: 13px; font-family: 'Space Mono', monospace;
  outline: none; cursor: pointer; transition: border-color .2s;
}
.metro-sig-label select:hover { border-color: var(--accent); }

.metro-start-btn {
  padding: 10px 30px; border-radius: 8px; border: none;
  background: linear-gradient(135deg, #059669, #10b981);
  color: #fff; font-weight: 700; font-size: 14px;
  cursor: pointer; transition: all .2s;
  font-family: 'Space Mono', monospace;
  box-shadow: 0 4px 14px rgba(16,185,129,.4);
  letter-spacing: .5px;
}
.metro-start-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(16,185,129,.6); }
.metro-start-btn:active { transform: translateY(1px); }
.metro-start-btn.running {
  background: linear-gradient(135deg, #b91c1c, #ef4444);
  box-shadow: 0 4px 14px rgba(239,68,68,.4);
}
.metro-start-btn.running:hover { box-shadow: 0 6px 20px rgba(239,68,68,.6); }
.metroTogBtn-active { background: rgba(16,185,129,0.15) !important; border-color: #10b981 !important; color: #10b981 !important; }

@media (max-width: 600px) {
  .metro-bpm-num { font-size: 44px; }
  .metro-beat-dot { width: 26px; height: 26px; }
}

/* ══════════════════════════════
   TOAST NOTIFICATION
══════════════════════════════ */
#_toast {
  position: fixed; bottom: 32px; left: 50%; transform: translateX(-50%) translateY(80px);
  background: var(--s2); border: 1px solid var(--accent);
  color: var(--text); padding: 12px 24px; border-radius: 30px;
  font-size: 14px; font-weight: 600; z-index: 9999;
  box-shadow: 0 8px 24px rgba(0,0,0,0.5);
  opacity: 0; transition: all .3s cubic-bezier(0.4,0,0.2,1);
  pointer-events: none; white-space: nowrap;
}
#_toast.toast-show {
  opacity: 1; transform: translateX(-50%) translateY(0);
}

/* ══════════════════════════════
   KEYBOARD SHORTCUTS PANEL
══════════════════════════════ */
.kbd-panel {
  position: fixed; bottom: 24px; right: 24px; z-index: 8000;
  background: var(--s2); border: 1px solid var(--accent);
  border-radius: 14px; padding: 20px 24px; min-width: 260px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.6);
  opacity: 0; transform: translateY(20px);
  transition: all .25s ease;
}
.kbd-panel.kbd-show { opacity: 1; transform: translateY(0); }
.kbd-title { color: var(--accent); font-size: 14px; font-weight: 800; margin: 0 0 14px; letter-spacing:.5px; }
.kbd-list {
  display: grid; grid-template-columns: auto 1fr;
  gap: 8px 16px; font-size: 13px;
}
.kbd-key {
  background: var(--s3); border: 1px solid var(--border); border-radius: 6px;
  padding: 2px 8px; font-family: 'Space Mono', monospace; font-size: 12px;
  color: var(--note-c); white-space: nowrap; text-align: center;
}
.kbd-list span:not(.kbd-key) { color: var(--text); opacity: .85; align-self: center; }
.kbd-close {
  position: absolute; top: 10px; right: 12px;
  background: none; border: none; color: var(--muted); cursor: pointer; font-size: 16px;
}
.kbd-close:hover { color: var(--text); }

/* ══════════════════════════════
   QUIZ STATS BAR
══════════════════════════════ */
.quiz-stats-bar {
  display: flex; flex-wrap: wrap; gap: 16px; justify-content: center;
  padding: 8px 0 4px; font-size: 12px; color: var(--muted);
  border-top: 1px solid rgba(255,255,255,0.05); margin-top: 8px;
}
.quiz-stats-bar span { display: flex; align-items: center; gap: 4px; }
.quiz-stats-bar strong { color: var(--text); }

/* ══════════════════════════════
   ONBOARDING TOUR
══════════════════════════════ */
.tour-spotlight {
  position: fixed; z-index: 9001; pointer-events: none;
  box-shadow: 0 0 0 9999px rgba(0,0,0,0.78);
  border-radius: 10px;
  transition: top .35s, left .35s, width .35s, height .35s cubic-bezier(0.4,0,0.2,1);
}
.tour-tooltip {
  position: fixed; z-index: 9002;
  background: var(--s2); border: 1px solid var(--accent);
  border-radius: 14px; padding: 20px 22px; width: 300px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.6);
  animation: fadeIn .25s ease;
}
.tour-step-lbl {
  font-size: 11px; color: var(--muted); font-weight: 700;
  letter-spacing: 2px; text-transform: uppercase; margin-bottom: 8px;
}
.tour-title {
  font-size: 17px; font-weight: 800; color: var(--accent); margin-bottom: 10px; line-height: 1.3;
}
.tour-body {
  font-size: 13px; color: var(--text); opacity: .88; line-height: 1.6; margin-bottom: 16px;
}
.tour-actions { display: flex; justify-content: space-between; align-items: center; gap: 8px; }
.tour-skip-btn {
  background: none; border: none; color: var(--muted); font-size: 12px;
  cursor: pointer; padding: 4px; transition: color .2s;
}
.tour-skip-btn:hover { color: var(--text); }
.tour-next-btn {
  padding: 8px 20px; border-radius: 8px; border: none;
  background: var(--accent); color: #fff; font-weight: 700; font-size: 13px;
  cursor: pointer; transition: all .2s;
  box-shadow: 0 3px 12px rgba(124,58,237,.4);
}
.tour-next-btn:hover { transform: translateY(-2px); box-shadow: 0 5px 16px rgba(124,58,237,.6); }