:root {
  --bg:       #080810;
  --surface:  rgba(13, 13, 26, 0.65);
  --s2:       rgba(20, 20, 40, 0.5);
  --s3:       rgba(30, 30, 60, 0.4);
  --border:   rgba(255, 255, 255, 0.12);
  --text:     #f0f0f8;
  --muted:    #a0a0c0;
  --root-c:   #f59e0b;
  --root-g:   rgba(245,158,11,.4);
  --note-c:   #22d3ee;
  --note-g:   rgba(34,211,238,.3);
  --accent:   #a855f7;
  --accent-g: rgba(168, 85, 247, 0.4);
  --neck-bd:  #25253d;
  --neck-bg1: #151522;
  --neck-bg2: #1e1e2d;
  --tab-bg:   rgba(18, 18, 32, 0.8);
}

/* ════ 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%); }
.hide { display: none !important; }
.show { display: block !important; }

/* ══════════════════════════════
   TOP DASHBOARD
══════════════════════════════ */
.top-dashboard {
  background: var(--surface);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  flex-direction: column;
  padding: 0;
}

.td-nav-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 24px;
  width: 100%;
}

/* MODALITÀ MINIMALE PER PAGINE SECONDARIE (Esercizi, Contatti, Donate...) */
body.minimal-header .music-controls,
body.minimal-header .header-tab-row,
body.minimal-header .scale-info,
body.minimal-header .pos-bar {
  display: none !important;
}
body.minimal-header .top-dashboard {
  padding-bottom: 0;
}

.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: 0; flex-wrap: nowrap; align-items: center; padding: 10px 16px; gap: 8px; }

.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 option, .quiz-ctrl-btn option {
  background: var(--bg);
  color: var(--text);
}
.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: linear-gradient(135deg, rgba(245,158,11,0.25), rgba(251,191,36,0.15));
  border-color: rgba(245,158,11,0.7) !important;
  color: #f59e0b;
  font-size: 16px !important;
  width: 34px !important; height: 34px !important;
  animation: coffee-bounce 1.8s infinite ease-in-out;
  position: relative;
}
@keyframes coffee-bounce {
  0%   { transform: translateY(0) scale(1);    box-shadow: 0 0 0   0   rgba(245,158,11,0); }
  25%  { transform: translateY(-3px) scale(1.12); box-shadow: 0 6px 18px 0   rgba(245,158,11,0.5); }
  50%  { transform: translateY(0) scale(1.05); box-shadow: 0 0 14px 4px rgba(245,158,11,0.35); }
  75%  { transform: translateY(-2px) scale(1.08); box-shadow: 0 4px 12px 2px rgba(245,158,11,0.4); }
  100% { transform: translateY(0) scale(1);    box-shadow: 0 0 0   0   rgba(245,158,11,0); }
}
.donate-btn-sm:hover { background: rgba(245,158,11,0.35); border-color: #f59e0b !important; box-shadow: 0 0 20px rgba(245,158,11,0.6); animation: none; transform: scale(1.15); }
.export-btn-sm { background: var(--s3); color: var(--muted); backdrop-filter: blur(5px); }
.export-btn-sm:hover { color: var(--text); border-color: var(--accent); background: var(--s2); box-shadow: 0 4px 15px var(--accent-g); }

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

/* Metro / Reset in root-notes row */
.header-action-btn { padding: 4px 8px; font-size: 11px; flex-shrink: 0; white-space: nowrap; }
.metro-prominent { border-color: var(--accent); color: var(--text); font-size: 12px; padding: 4px 12px; }
.metro-prominent:hover { background: rgba(124,58,237,.15); }
.metro-prominent.metroTogBtn-active { background: rgba(124,58,237,.2); border-color: var(--accent); color: #fff; }

/* Music Controls Scrollers */
.music-controls {
  padding: 0 0 12px;
  animation: slideDown .3s ease-out;
}
@keyframes slideDown { from{opacity:0; transform:translateY(-10px)} to{opacity:1; transform:translateY(0)} }

.scroller-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 16px;
  width: 100%;
}

.root-scroll, .scales-scroll {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 4px 0;
  scrollbar-width: none; /* Firefox */
  flex: 1;
}
.ctrl-row .root-scroll { flex: 0 0 auto; }
.root-scroll::-webkit-scrollbar, .scales-scroll::-webkit-scrollbar { display: none; }

.mini-btn {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  flex-shrink: 0;
}

.transp-btn {
  background: var(--s3);
  border: 1px solid var(--border);
  color: var(--muted);
}

.sg-tabs { display: flex; gap: 4px; padding-right: 12px; border-right: 1px solid var(--border); margin-right: 4px; }
.sg-tab {
  background: var(--s3); border: 1px solid var(--border); color: var(--muted);
  padding: 6px 14px; font-size: 11px; font-family: 'Space Mono', monospace;
  cursor: pointer; transition: all .2s; user-select: none; text-align: center;
  border-radius: 8px;
}
.sg-tab:hover { color: var(--text); border-color: var(--muted); }
.sg-tab.on { background: var(--accent); color: #fff; border-color: var(--accent); font-weight:700; box-shadow: 0 4px 12px var(--accent-g); }

.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; position: relative; display: flex; justify-content: center; }
.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: 0.5cm; }
  * { 
    -webkit-print-color-adjust: exact !important; 
    print-color-adjust: exact !important; 
    text-shadow: none !important;
    box-shadow: none !important;
  }
  .top-dashboard, .pos-bar, .legend, footer, .header-tab-row, .kbd-panel, .tour-spotlight, .tour-tooltip, .settings-panel {
    display: none !important; 
    visibility: hidden !important;
    opacity: 0 !important;
    pointer-events: none !important;
  }
  .app { 
    display: block !important; 
    background: #fff !important; 
    padding: 0 !important; 
    margin: 0 !important;
    min-height: auto !important;
  }
  .main { 
    width: 100% !important; 
    overflow: visible !important;
    display: block !important;
  }
  body { 
    background: #fff !important; 
    color: #000 !important; 
  }
  .scale-info { 
    background: #fff !important; 
    border: 1px solid #eee !important; 
    padding: 10px 15px !important; 
    margin-bottom: 10px !important;
    color: #000 !important;
  }
  .si-name { color: #000 !important; font-size: 24px !important; }
  .si-sub  { color: #444 !important; }
  
  .nb-n { background: #f0f0f0 !important; color: #000 !important; border: 1px solid #333 !important; box-shadow:none !important; }
  .nb.root .nb-n { background: #ddd !important; color: #000 !important; border-color: #000 !important; font-weight: bold !important; }
  .nb-d { color: #555 !important; }
  
  .fb-area { 
    padding: 10px !important; 
    overflow: visible !important; 
    width: 100% !important;
  }
  .fb-layout { width: 100% !important; }
  .fb-neck { background: #fff !important; border: 1px solid #000 !important; box-shadow: none !important; }
  .fb-nut  { background: #444 !important; box-shadow:none !important; }
  .fb-wire { background: #666 !important; box-shadow:none !important; }
  .fb-sl   { background: #888 !important; box-shadow:none !important; }
  .fb-dot  { background: #eee !important; border: 1px solid #999 !important; box-shadow:none !important; }
  .fb-lbl  { color: #000 !important; text-shadow: none !important; }
  .fb-n    { color: #666 !important; }
  
  .nd.sn { background: #eee !important; color: #000 !important; border: 1.5px solid #000 !important; box-shadow: none !important; }
  .nd.rn { background: #000 !important; color: #fff !important; border: 1.5px solid #000 !important; box-shadow: none !important; }
  .nd span { color: inherit !important; }
}

@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; }
}

/* DONATION GLOW */
@keyframes donate-pulse {
  0% { box-shadow: 0 0 0px rgba(255,179,0,0); transform: scale(1); }
  50% { box-shadow: 0 0 15px rgba(255,179,0,0.6); transform: scale(1.05); border-color: #ffb300; }
  100% { box-shadow: 0 0 0px rgba(255,179,0,0); transform: scale(1); }
}
.donate-btn-sm {
  animation: donate-pulse 2s infinite ease-in-out;
  border: 1px solid rgba(255,179,0,0.3) !important;
}

/* TAB TRANSCRIPTION */
.tab-transcription-panel {
  display: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  margin: 20px auto;
  max-width: 95%;
  backdrop-filter: blur(10px);
}

.tab-ascii-box {
  background: #000;
  color: #c0c0d0;
  padding: 16px;
  border-radius: 8px;
  font-family: 'Space Mono', monospace;
  font-size: 16px;
  line-height: 1.5;
  overflow-x: auto;
  white-space: pre;
  border: 1px solid #333;
  margin: 15px 0;
  scrollbar-width: thin;
}

.tab-controls {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

/* QUIZ UI - Arcade Mode v2.0 */
.quiz-panel { display: none; text-align: center; margin-top: 20px; margin-bottom: 30px; transition: transform 0.2s; }
.quiz-panel.show { display: block; }

.quiz-shake { animation: quizShake 0.4s cubic-bezier(.36,.07,.19,.97) both; }
@keyframes quizShake {
  10%, 90% { transform: translate3d(-1px, 0, 0); }
  20%, 80% { transform: translate3d(2px, 0, 0); }
  30%, 50%, 70% { transform: translate3d(-4px, 0, 0); }
  40%, 60% { transform: translate3d(4px, 0, 0); }
}

.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: 10px; max-width: 520px; margin: 0 auto; }
.quiz-btn {
  padding: 12px 0; border-radius: 14px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); font-weight: 800; cursor: pointer; 
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275); 
  font-size: 16px; font-family: 'Space Mono', monospace; width: 68px;
  backdrop-filter: blur(10px);
}
.quiz-btn:hover { 
  border-color: var(--accent); 
  color: #fff; 
  transform: translateY(-5px) scale(1.05); 
  box-shadow: 0 12px 25px var(--accent-g);
  background: var(--accent);
}
.quiz-btn:active { transform: translateY(-1px); }

.quiz-btn.wrong { background: #ef4444 !important; color: #fff !important; border-color: #ef4444 !important; box-shadow: 0 0 20px rgba(239,68,68,0.5); }
.quiz-btn.correct { background: #10b981 !important; color: #fff !important; border-color: #10b981 !important; box-shadow: 0 0 20px rgba(16,185,129,0.5); }

/* Note accidental different style */
.quiz-btn.accidental { background: rgba(255,255,255,0.05); }

.nd.q-dot { 
  background: #f59e0b !important; 
  box-shadow: 0 0 20px #f59e0b !important; 
  opacity: 1 !important; z-index: 10; cursor: default;
  transition: all 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.nd.q-dot.correct-pop { animation: qPopSuccess 0.4s ease-out; }
@keyframes qPopSuccess {
  0% { transform: translate(-50%,-50%) scale(1); }
  50% { transform: translate(-50%,-50%) scale(1.6); filter: brightness(1.5); }
  100% { transform: translate(-50%,-50%) scale(1); }
}

.nd.q-dot span { display: none !important; }

/* === QUIZ ARCADE HUD === */
.quiz-hud {
  max-width: 1000px; width: 95%; margin: 0 auto 16px;
  background: var(--s2); border: 1px solid var(--border); border-radius: 16px;
  overflow: hidden; box-shadow: 0 10px 30px rgba(0,0,0,0.4);
}
.quiz-timer-bar { height: 8px; background: rgba(0,0,0,0.4); width: 100%; position: relative; }
.quiz-timer-fill {
  height: 100%; width: 100%; background: linear-gradient(90deg, #10b981, #22d3ee, #8b5cf6);
  background-size: 200% 100%;
  animation: bgScroll 3s linear infinite;
  transition: width 1s linear; transform-origin: left;
}
@keyframes bgScroll { 0% { background-position: 100% 0; } 100% { background-position: 0% 0; } }
.quiz-timer-fill.urgent { background: linear-gradient(90deg, #ef4444, #f59e0b); }

.quiz-hud-row { display: flex; justify-content: space-between; align-items: center; padding: 14px 24px; }
.quiz-single-row {
  display: flex; align-items: center; gap: 12px;
  padding: 8px 16px; flex-wrap: nowrap;
  overflow-x: auto; scrollbar-width: none;
  justify-content: space-between;
}
.quiz-single-row::-webkit-scrollbar { display: none; }
.quiz-sep { width: 1px; height: 30px; background: var(--border); flex-shrink: 0; margin: 0 4px; }
.quiz-score { font-size: 20px; font-weight: 950; color: #f59e0b; font-family: 'Space Mono', monospace; margin-bottom: 0; text-shadow: 0 2px 10px rgba(245,158,11,0.3); white-space: nowrap; }
.quiz-combo { font-size: 13px; font-weight: 800; color: #10b981; transition: all .2s; background: rgba(16,185,129,0.1); padding: 4px 10px; border-radius: 20px; white-space: nowrap; }
.quiz-combo.pop { transform: scale(1.5); color: #22d3ee; box-shadow: 0 0 15px rgba(34,211,238,0.5); }
.quiz-time { font-size: 15px; font-weight: 700; color: var(--text); font-family: 'Space Mono', monospace; white-space: nowrap; min-width: 60px; }

.quiz-controls {
  display: flex; justify-content: center; gap: 10px; padding: 12px 24px; flex-wrap: wrap; background: rgba(0,0,0,0.1); border-bottom: 1px solid var(--border);
}
.quiz-ctrl-btn {
  background: rgba(255,255,255,0.05); border: 1px solid var(--border); color: #fff;
  padding: 4px 10px; border-radius: 8px; font-family: 'Space Mono', monospace; font-size: 11px;
  cursor: pointer; display: flex; align-items: center; gap: 6px; transition: all 0.2s;
  white-space: nowrap; flex-shrink: 0;
}
.quiz-ctrl-btn:hover { background: rgba(255,255,255,0.1); border-color: var(--accent); transform: translateY(-2px); }
.quiz-ctrl-btn:active { transform: translateY(0); }

/* === QUIZ RESULT MODAL - Ranking Edition === */
.quiz-result-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 24px;
  padding: 40px; max-width: 420px; width: 92%; text-align: center;
  box-shadow: 0 30px 80px rgba(0,0,0,0.6);
  position: relative; overflow: hidden;
}
.quiz-result-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 6px;
  background: linear-gradient(90deg, #f59e0b, #ef4444, #f59e0b);
}
.quiz-rank-msg { font-size: 14px; text-transform: uppercase; letter-spacing: 3px; color: var(--accent); font-weight: 800; margin-bottom: 4px; }
.quiz-rank-name { font-size: 32px; font-weight: 900; color: #fff; margin-bottom: 24px; text-shadow: 0 0 20px var(--accent-g); }
.quiz-result-score { font-size: 64px; font-weight: 900; color: #f59e0b; font-family: 'Space Mono', monospace; line-height: 1; margin-bottom: 10px; }
.quiz-result-label { font-size: 13px; color: var(--muted); margin: 6px 0 24px; text-transform: uppercase; letter-spacing: 2px; }
.quiz-result-stats { display: flex; justify-content: space-around; margin-bottom: 20px; gap: 12px; }
.quiz-result-stat { display: flex; flex-direction: column; align-items: center; gap: 4px; background: var(--s2); border-radius: 10px; padding: 12px 16px; flex: 1; }
.qrs-val { font-size: 22px; font-weight: 900; color: var(--text); font-family: 'Space Mono', monospace; }
.qrs-lbl { font-size: 10px; text-transform: uppercase; letter-spacing: 1px; color: var(--muted); }
.quiz-result-new-record {
  font-size: 16px; font-weight: 800; color: #f59e0b;
  background: rgba(245,158,11,.1); border: 1px solid rgba(245,158,11,.3);
  border-radius: 8px; padding: 8px; margin-bottom: 20px;
}

@keyframes shake {
  0% { transform: translateX(0); }
  25% { transform: translateX(-4px); }
  50% { transform: translateX(4px); }
  75% { transform: translateX(-4px); }
  100% { transform: translateX(0); }
}

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

.tuner-ui { max-width: 500px; margin: 0 auto; display: flex; flex-direction: column; align-items: center; gap: 16px; }

.tuner-top { display: flex; align-items: baseline; gap: 18px; }
.tuner-note-display {
  font-size: 72px; font-weight: 900; font-family: 'Space Mono', monospace;
  color: var(--text); line-height: 1; min-width: 90px; text-align: center;
  transition: color .2s;
}
.tuner-note-display.in-tune { color: #10b981; text-shadow: 0 0 20px rgba(16,185,129,.5); }
.tuner-note-display.close   { color: #f59e0b; }
.tuner-note-display.out     { color: #ef4444; }
.tuner-freq-display { font-size: 22px; color: var(--muted); font-family: 'Space Mono', monospace; }

/* Meter bar */
.tuner-meter { width: 100%; }
.tuner-meter-track {
  position: relative; height: 36px; border-radius: 18px;
  display: flex; overflow: hidden; border: 1px solid var(--border);
}
.tuner-meter-zone-red-l, .tuner-meter-zone-red-r   { flex: 2; background: rgba(239,68,68,.25); }
.tuner-meter-zone-yellow-l, .tuner-meter-zone-yellow-r { flex: 1.5; background: rgba(245,158,11,.2); }
.tuner-meter-zone-green { flex: 1; background: rgba(16,185,129,.3); }

.tuner-needle {
  position: absolute; top: 4px; bottom: 4px; width: 3px; border-radius: 3px;
  background: #fff; left: 50%; transform: translateX(-50%);
  transition: left .08s ease-out, background .15s;
  box-shadow: 0 0 8px rgba(255,255,255,.6);
}
.tuner-needle.in-tune { background: #10b981; box-shadow: 0 0 14px rgba(16,185,129,.8); }
.tuner-needle.close   { background: #f59e0b; box-shadow: 0 0 10px rgba(245,158,11,.6); }
.tuner-needle.out     { background: #ef4444; box-shadow: 0 0 10px rgba(239,68,68,.6); }

.tuner-center-mark {
  position: absolute; top: 0; bottom: 0; left: 50%; width: 2px;
  background: rgba(255,255,255,.2); transform: translateX(-50%); pointer-events: none;
}
.tuner-meter-labels {
  display: flex; justify-content: space-between;
  padding: 4px 2px 0; font-size: 10px; color: var(--muted);
  font-family: 'Space Mono', monospace;
}
.tuner-cents-display {
  font-size: 24px; font-weight: 700; font-family: 'Space Mono', monospace;
  color: var(--muted); transition: color .2s;
}
.tuner-status { font-size: 12px; color: var(--muted); text-align: center; }

.tuner-start-btn {
  margin-top: 8px; padding: 12px 32px;
  background: var(--accent); border: none; border-radius: 100px;
  color: #fff; font-size: 15px; font-weight: 700; font-family: 'Space Mono', monospace;
  cursor: pointer; transition: all .2s;
  box-shadow: 0 4px 20px rgba(124,58,237,.4);
}
.tuner-start-btn:hover { filter: brightness(1.15); transform: translateY(-2px); }
.tuner-start-btn:active { transform: translateY(0); }
.tuner-start-btn.active { background: #ef4444; box-shadow: 0 4px 20px rgba(239,68,68,.4); }
.tuner-start-btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

[data-theme="light"] .tuner-panel { background: rgba(255,255,255,0.75); }
[data-theme="light"] .tuner-needle { background: var(--text); }

/* ══════════════════════════════
   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; }

/* ════ 3-COLUMN DESKTOP LAYOUT ════ */
.metro-desk-grid {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 32px 40px;
  align-items: center;
  max-width: 960px;
  margin: 0 auto;
}

.metro-dc {
  display: flex; flex-direction: column; gap: 20px;
  align-self: stretch; justify-content: center;
}
.metro-dc-left { align-items: flex-end; padding-right: 8px; border-right: 1px solid var(--border); }
.metro-dc-right { align-items: flex-start; padding-left: 8px; border-left: 1px solid var(--border); }

.metro-ctrl-grp { display: flex; flex-direction: column; gap: 8px; }
.metro-toggle-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.metro-incr-row { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.metro-select {
  background: var(--s3); border: 1px solid var(--border); color: var(--text);
  border-radius: 8px; padding: 6px 10px; font-size: 13px; font-weight: 600;
  cursor: pointer; outline: none; min-width: 100px;
  transition: border-color 0.2s;
}
.metro-select:focus { border-color: var(--accent); }

/* Volume slider */
.metro-vol-slider {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 4px; border-radius: 2px;
  background: var(--border); outline: none; cursor: pointer;
}
.metro-vol-slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 16px; height: 16px; border-radius: 50%;
  background: var(--accent); cursor: pointer;
  box-shadow: 0 0 6px var(--accent-g);
}
.metro-vol-slider::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%; border: none;
  background: var(--accent); cursor: pointer;
}

/* Half / Double BPM */
.metro-action-row { display: flex; align-items: center; gap: 16px; justify-content: center; }
.metro-halfdbl-btn {
  width: 42px; height: 42px; border-radius: 10px;
  background: var(--s3); border: 1px solid var(--border);
  color: var(--muted); font-size: 13px; font-weight: 800;
  font-family: 'Space Mono', monospace; cursor: pointer;
  transition: all 0.2s;
}
.metro-halfdbl-btn:hover { background: var(--s2); border-color: var(--accent); color: var(--text); transform: scale(1.08); }

/* Step grid */
.metro-step-wrap { display: flex; flex-direction: column; gap: 8px; align-items: center; width: 100%; }
.metro-step-grid {
  display: grid; grid-template-columns: repeat(16, 1fr);
  gap: 4px; width: 100%; max-width: 360px;
}
.step-dot {
  aspect-ratio: 1; border-radius: 3px;
  background: var(--s3); border: 1px solid rgba(255,255,255,0.06);
  transition: all 0.15s;
}
.step-dot.step-beat { border-color: rgba(255,255,255,0.15); }
.step-dot.step-accent { background: var(--root-c); box-shadow: 0 0 8px var(--root-g); }
.step-dot.step-normal { background: var(--note-c); box-shadow: 0 0 4px var(--note-g); }
.step-dot.step-ghost { background: var(--border); }

/* Flash right-col button sync */
#metroFlashTogRight { transition: all 0.2s; }
#metroFlashTogRight.on { color: var(--accent); border-color: var(--accent); background: var(--s2); }

/* Mobile-only: ⚙️ button */
.metro-mobile-only { display: none !important; }

/* ════ CENTER COL: metro-ui-tack (unchanged structure) ════ */
.metro-ui-tack {
  display: flex; flex-direction: column; align-items: center;
  gap: 20px; max-width: 440px; margin: 0; padding: 10px 0;
}

.metro-t-header { width: 100%; display: flex; justify-content: center; padding: 10px 0; }
.metro-beats { display: flex; gap: 14px; align-items: center; }
.metro-beat-dot {
  width: 28px; height: 28px; border-radius: 50%;
  border: 2px solid var(--border); background: var(--s3);
  transition: all .06s ease;
}
.metro-beat-dot.lit { background: var(--note-c); box-shadow: 0 0 20px var(--note-g); transform: scale(1.15); }
.metro-beat-dot.lit.accent { background: var(--root-c); box-shadow: 0 0 25px var(--root-g); transform: scale(1.25); }

/* Center: BPM HERO DISK */
.metro-t-body { display: flex; align-items: center; gap: 24px; margin: 15px 0; }
.metro-h-btn {
  width: 44px; height: 44px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--s3); color: var(--text); font-size: 24px; cursor: pointer;
  display: grid; place-items: center; transition: all 0.2s;
}
.metro-h-btn:hover { background: var(--s2); border-color: var(--accent); transform: scale(1.1); }

.metro-bpm-hero {
  width: 180px; height: 180px; border-radius: 50%;
  background: radial-gradient(circle at center, var(--s3) 0%, var(--bg) 100%);
  border: 1px solid var(--border); 
  display: flex; align-items: center; justify-content: center;
  position: relative; cursor: pointer; user-select: none;
  box-shadow: 0 10px 30px rgba(0,0,0,0.4), inset 0 0 20px rgba(129,59,246,0.1);
  transition: transform 0.1s, box-shadow 0.2s;
}
.metro-bpm-hero:active { transform: scale(0.96); }
.metro-bpm-hero::before {
  content: ''; position: absolute; inset: -4px; border-radius: 50%;
  border: 1px solid var(--accent); opacity: 0.15;
}

.hero-inner { display: flex; flex-direction: column; align-items: center; text-align: center; }
.hero-term { font-size: 11px; font-weight: 700; text-transform: uppercase; color: var(--accent); letter-spacing: 2px; margin-bottom: 2px; }
.hero-val { font-size: 64px; font-weight: 900; font-family: 'Space Mono', monospace; line-height: 1; color: var(--text); }
.hero-unit { font-size: 10px; font-weight: 700; color: var(--muted); letter-spacing: 3px; margin-top: 4px; }

/* Timer & Progress */
.metro-t-timer { width: 100%; max-width: 340px; margin: 10px 0; }
.t-times { display: flex; justify-content: space-between; font-size: 13px; font-family: 'Space Mono', monospace; color: var(--muted); margin-bottom: 8px; }
.t-progress-track { width: 100%; height: 4px; background: var(--border); border-radius: 2px; overflow: hidden; }
.t-progress-fill { width: 0%; height: 100%; background: var(--accent); box-shadow: 0 0 10px var(--accent-g); transition: width 0.3s linear; }

/* Subdivisions Row */
.metro-t-subs { display: flex; align-items: center; gap: 15px; width: 100%; justify-content: center; }
.metro-t-subs .metro-subs { display: flex; gap: 8px; }
.metro-t-subs .p { width: 36px; height: 36px; border-radius: 50%; padding: 0; display: grid; place-items: center; font-size: 12px; }
.metro-subs.locked { opacity: .4; pointer-events: none; }

/* Footer Actions */
.metro-t-footer { display: flex; align-items: center; gap: 18px; margin-top: 20px; }
.metro-s-btn {
  width: 46px; height: 46px; border-radius: 50%; border: 1px solid var(--border);
  background: var(--s3); color: var(--muted); cursor: pointer; 
  display: grid; place-items: center; font-size: 18px; transition: all 0.2s;
}
.metro-s-btn:hover { border-color: var(--accent); color: var(--text); transform: translateY(-2px); }
.metro-s-btn.on { color: var(--accent); border-color: var(--accent); background: var(--s2); }

.metro-t-play {
  width: 72px; height: 72px; border-radius: 50%; border: none;
  background: linear-gradient(135deg, var(--accent), #0891b2);
  color: #fff; font-size: 26px; cursor: pointer;
  display: grid; place-items: center; transition: all 0.2s;
  box-shadow: 0 6px 20px rgba(124,58,237,0.4);
}
.metro-t-play:hover { transform: scale(1.08); box-shadow: 0 10px 25px rgba(124,58,237,0.5); }
.metro-t-play.running { background: linear-gradient(135deg, #ef4444, #b91c1c); box-shadow: 0 6px 20px rgba(239,68,68,0.4); }

.metro-panel.flash { animation: metroFlash 0.1s ease-out; }
@keyframes metroFlash { 
  0% { filter: brightness(1.8); } 100% { filter: brightness(1); }
}

[data-theme="light"] .metro-bpm-hero { background: radial-gradient(circle at center, #fff 0%, #f1f5f9 100%); }

@media (max-width: 480px) {
  .metro-bpm-hero { width: 150px; height: 150px; }
  .hero-val { font-size: 48px; }
  .metro-t-body { gap: 12px; }
  .metro-beat-dot { width: 22px; height: 22px; gap: 8px; }
  .metro-beats { gap: 8px; }
}

/* ══════════════════════════════
   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); }

.row-label-sm {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  font-weight: 800;
  color: var(--muted);
}

.metro-advanced {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: all 0.3s ease;
  animation: slideDown 0.3s ease-out;
}
@keyframes slideDown {
  from { opacity: 0; transform: translateY(-10px); }
  to { opacity: 1; transform: translateY(0); }
}

.adv-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.adv-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}
.sm-input-num {
  background: var(--s3) !important;
  border: 1px solid var(--border) !important;
  color: var(--text) !important;
  padding: 8px 0 !important;
  border-radius: 10px !important;
  width: 60px !important;
  text-align: center !important;
  font-family: 'Space Mono', monospace !important;
  font-weight: 700 !important;
  font-size: 15px !important;
  outline: none !important;
  transition: all 0.2s !important;
  -moz-appearance: textfield;
}
.sm-input-num::-webkit-inner-spin-button,
.sm-input-num::-webkit-outer-spin-button { -webkit-appearance: none; margin: 0; }
.sm-input-num:focus { border-color: var(--accent) !important; box-shadow: 0 0 10px var(--accent-g); }

.unit {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--muted);
  font-weight: 600;
}

/* Custom Checkbox as a Toggle */
.adv-check {
  width: 18px; height: 18px; cursor: pointer;
  accent-color: var(--accent);
}

/* ══════════════════════════════
   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); }
/* ══════════════════════════════
   HEADER TAB ROW (pills)
══════════════════════════════ */
.header-tab-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex: 1;
  justify-content: center;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
  padding: 0 8px;
}
.header-tab-row::-webkit-scrollbar { display: none; }

.tab-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--s3);
  border: 1px solid var(--border);
  color: var(--muted);
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 12px;
  font-family: 'Space Mono', monospace;
  font-weight: 700;
  cursor: pointer;
  transition: all .2s;
  white-space: nowrap;
  flex-shrink: 0;
  text-transform: uppercase;
  letter-spacing: 0.3px;
}
.tab-btn:hover {
  border-color: var(--accent);
  color: var(--text);
  transform: translateY(-1px);
}
.tab-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
  box-shadow: 0 4px 12px rgba(124,58,237,.35);
}
.tab-btn .tab-icon { font-size: 14px; }

/* ══════════════════════════════
   SETTINGS MODAL
══════════════════════════════ */
.flex-center { display: flex; align-items: center; justify-content: center; }
.hide { display: none !important; }

.settings-modal {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  backdrop-filter: blur(8px);
  z-index: 2000;
  padding: 20px;
}

.sm-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  width: 100%;
  max-width: 450px;
  max-height: 85vh;
  overflow-y: auto;
  box-shadow: 0 30px 60px rgba(0,0,0,0.5);
  animation: modalIn .3s cubic-bezier(0.4, 0, 0.2, 1);
}
@keyframes modalIn { from{opacity:0; transform: scale(0.9) translateY(20px)} to{opacity:1; transform: scale(1) translateY(0)} }

.sm-header {
  padding: 24px 24px 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.sm-header h2 { font-size: 20px; font-weight: 900; }

.sm-content { padding: 0 24px 24px; }

.sm-group { margin-top: 24px; }
.sm-group h3 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--muted);
  margin-bottom: 12px;
}

.sm-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}
.sm-row:last-child { border-bottom: none; }

.sm-row span { font-size: 14px; font-weight: 600; }

.sm-select {
  background: var(--s3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 12px;
  border-radius: 10px;
  font-family: 'Space Mono', monospace;
  font-size: 13px;
  outline: none;
}

.icon-btn-text {
  background: var(--s3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 16px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
  transition: all .2s;
}
.icon-btn-text:hover { border-color: var(--accent); color: var(--accent); }

/* ══════════════════════════════
   DISPLAY OPTIONS ROW (header)
══════════════════════════════ */
.ctrl-row {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 16px 8px;
  flex-wrap: wrap;
  justify-content: flex-start;
}
.opt-sel {
  background: var(--s3);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 5px 8px;
  border-radius: 8px;
  font-family: 'Space Mono', monospace;
  font-size: 11px;
  outline: none;
  cursor: pointer;
  transition: border-color .2s;
}
.opt-sel:hover, .opt-sel:focus { border-color: var(--accent); }

.opts-divider {
  width: 1px; height: 20px;
  background: var(--border);
  margin: 0 4px;
  flex-shrink: 0;
}

/* ── HEADER SETTINGS INLINE ────────────────────────────── */
.header-settings {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}

/* ── OVERFLOW MENU ──────────────────────────────────────── */
.td-icons {
  display: flex;
  align-items: center;
  gap: 8px;
}
.overflow-wrap { position: relative; }
.overflow-menu {
  display: none;
  flex-direction: column;
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 6px;
  z-index: 500;
  min-width: 170px;
  box-shadow: 0 8px 32px rgba(0,0,0,.5);
  backdrop-filter: blur(12px);
}
.overflow-menu.open { display: flex; }
.ovf-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: 8px;
  background: none;
  border: none;
  color: var(--text);
  font-family: 'Space Mono', monospace;
  font-size: 12px;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s;
  white-space: nowrap;
}
.ovf-item:hover { background: var(--s3); }

/* ══════════════════════════════
   SETTINGS PANEL (inline tab)
══════════════════════════════ */
.settings-panel {
  display: none;
  padding: 20px 24px;
  max-width: 500px;
  margin: 0 auto;
  animation: fadeIn .3s ease;
}
.settings-panel .sm-footer {
  padding: 16px 0;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 16px;
}

body.tab-settings .main > *:not(.settings-panel) { display: none !important; }
body.tab-settings .settings-panel { display: block !important; }

/* Custom hide logic for tab views */
body.tab-studio .quiz-panel,
body.tab-studio .tuner-panel { display: none !important; }
body.tab-studio .metro-panel:not(.show) { display: none; }

/* Compact metro layout when inline in Studio tab */
body.tab-studio .metro-panel.show {
  display: block !important;
  padding: 4px 12px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
body.tab-studio .metro-panel.show .metro-desk-grid {
  display: flex; flex-direction: row; flex-wrap: nowrap;
  justify-content: center; align-items: center;
  gap: 16px; max-width: none; width: 100%;
}
body.tab-studio .metro-panel.show .metro-dc-left,
body.tab-studio .metro-panel.show .metro-dc-right { display: none; }
body.tab-studio .metro-panel.show .metro-ui-tack {
  flex-direction: row; flex-wrap: nowrap;
  justify-content: center; max-width: none;
  width: auto; gap: 16px; padding: 0;
}
body.tab-studio .metro-panel.show .metro-t-header,
body.tab-studio .metro-panel.show .metro-t-body,
body.tab-studio .metro-panel.show .metro-t-subs,
body.tab-studio .metro-panel.show .metro-t-footer {
  width: auto; margin: 0; padding: 0;
}
body.tab-studio .metro-panel.show .metro-beat-dot { width: 10px; height: 10px; }
body.tab-studio .metro-panel.show .metro-beats { gap: 4px; }
body.tab-studio .metro-panel.show .metro-bpm-hero {
  width: auto; height: auto; background: none; border: none; box-shadow: none; pointer-events: none;
}
body.tab-studio .metro-panel.show .hero-inner { flex-direction: row; gap: 4px; align-items: baseline; }
body.tab-studio .metro-panel.show .hero-val { font-size: 20px; }
body.tab-studio .metro-panel.show .hero-term,
body.tab-studio .metro-panel.show .hero-unit { display: none; }
body.tab-studio .metro-panel.show .metro-h-btn { width: 28px; height: 28px; font-size: 14px; }
body.tab-studio .metro-panel.show .metro-t-timer,
body.tab-studio .metro-panel.show .metro-step-wrap,
body.tab-studio .metro-panel.show .metro-action-row { display: none; }
body.tab-studio .metro-panel.show .metro-t-subs .row-label-sm { display: none; }
body.tab-studio .metro-panel.show .metro-t-subs .metro-subs .p { width: 26px; height: 26px; font-size: 10px; }
body.tab-studio .metro-panel.show .metro-t-play { width: 36px; height: 36px; font-size: 16px; }
body.tab-studio .metro-panel.show .metro-s-btn { display: none; }
body.tab-studio .metro-panel.show .metro-advanced { display: none !important; }

body.tab-quiz .main > *:not(.fb-area):not(.quiz-panel) { display: none !important; }
body.tab-quiz .quiz-panel { display: block !important; margin-top: 0; }
body.tab-quiz .fb-area { padding-top: 10px; }

body.tab-tuner .main > *:not(.tuner-panel) { display: none !important; }
body.tab-tuner .tuner-panel { display: block !important; }

body.tab-metro .main > *:not(.metro-panel) { display: none !important; }
body.tab-metro .metro-panel { display: block !important; border-bottom: none; }


/* ══════════════════════════════
   TOAST NOTIFICATION
══════════════════════════════ */
.toast {
  position: fixed; bottom: 100px; left: 50%; transform: translateX(-50%);
  background: rgba(15, 15, 30, 0.95); color: #fff;
  padding: 12px 24px; border-radius: 30px; border: 1px solid var(--border);
  font-size: 14px; font-weight: 700; z-index: 9999;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
  animation: toastIn 0.3s cubic-bezier(0.18, 0.89, 0.32, 1.28) forwards;
  pointer-events: none;
}
@keyframes toastIn {
  from { opacity: 0; transform: translate(-50%, 20px); }
  to { opacity: 1; transform: translate(-50%, 0); }
}
.toast-out { animation: toastOut 0.3s ease-in forwards; }
@keyframes toastOut {
  from { opacity: 1; transform: translate(-50%, 0); }
  to { opacity: 0; transform: translate(-50%, -20px); }
}

/* QUIZ COUNTDOWN OVERLAY */
.quiz-cd-overlay {
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  display: flex;
  justify-content: center;
  align-items: center;
  background: rgba(8, 8, 20, 0.7);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 500;
  border-radius: 12px;
  animation: fadeIn 0.2s ease;
}
.quiz-cd-num {
  font-size: 160px;
  font-weight: 950;
  color: #fff;
  text-shadow: 0 0 30px var(--accent-g), 0 0 60px rgba(255,255,255,0.2);
  font-family: 'Space Mono', monospace;
  animation: qPopCd 0.6s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  user-select: none;
}
@keyframes qPopCd {
  0% { transform: scale(0.4); opacity: 0; }
  100% { transform: scale(1); opacity: 1; }
}
.quiz-cd-overlay.go .quiz-cd-num {
  color: #10B981;
  text-shadow: 0 0 40px rgba(16,185,129,0.5);
  animation: qPopGo 0.4s ease-out;
}
@keyframes qPopGo {
  0% { transform: scale(1); }
  100% { transform: scale(1.4); opacity: 0; }
}

/* ══════════════════════════════
   CTRL-OPTS-SCROLL: transparent on desktop, scrollable row on mobile
══════════════════════════════ */
.ctrl-opts-scroll { display: contents; }

/* ══════════════════════════════
   BOTTOM TAB BAR (mobile only)
══════════════════════════════ */
.bottom-tab-bar { display: none; }

/* ══════════════════════════════
   MOBILE ≤ 768px
══════════════════════════════ */
@media (max-width: 768px) {

  /* ── Bottom fixed nav bar ── */
  .bottom-tab-bar {
    display: flex;
    position: fixed;
    bottom: 0; left: 0; right: 0;
    background: var(--surface);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    z-index: 200;
    padding-bottom: env(safe-area-inset-bottom, 0px);
  }
  .bottom-tab-bar .tab-btn {
    flex: 1;
    flex-direction: column;
    gap: 2px;
    padding: 8px 2px;
    border-radius: 0;
    border: none;
    height: 56px;
    min-width: 0;
    font-size: 10px;
    letter-spacing: 0;
    text-transform: none;
    justify-content: center;
    background: transparent;
    box-shadow: none;
    color: var(--muted);
  }
  .bottom-tab-bar .tab-btn .tab-icon { font-size: 22px; line-height: 1.2; display: block; }
  .bottom-tab-bar .tab-btn .tab-label { font-size: 10px; line-height: 1; }
  .bottom-tab-bar .tab-btn.active { background: transparent; box-shadow: none; color: var(--accent); }
  .bottom-tab-bar .tab-btn.active .tab-label { color: var(--accent); font-weight: 700; }
  [data-theme="light"] .bottom-tab-bar { background: rgba(255,255,255,0.95); }

  /* ── App needs space for fixed bottom bar ── */
  .app { padding-bottom: calc(56px + env(safe-area-inset-bottom, 0px)); }

  /* ── Hide header tabs (bottom bar takes over) ── */
  .header-tab-row { display: none !important; }

  /* ── Hide desktop-only header icons ── */
  .desktop-only { display: none !important; }

  /* ── Compact header bar ── */
  .td-nav-bar { padding: 8px 12px; gap: 6px; }
  .td-icons { width: auto; padding-top: 0; border-top: none; gap: 4px; }
  .header-settings { gap: 4px; }
  .lang-ctrl .p { padding: 3px 5px; font-size: 10px; }

  /* ── Theme/Audio: icon-only on mobile ── */
  .btn-lbl { display: none; }

  /* ── Ctrl-row: grid so ◀ notes ▶ stay on one line ── */
  .ctrl-row {
    display: grid;
    grid-template-columns: auto 1fr auto;
    grid-template-rows: auto auto;
    gap: 4px;
    padding: 0 8px 4px;
    align-items: center;
  }
  #transpDn   { grid-column: 1; grid-row: 1; }
  #rootCtrl   { grid-column: 2; grid-row: 1; overflow-x: auto; scrollbar-width: none; }
  #rootCtrl::-webkit-scrollbar { display: none; }
  #transpUp   { grid-column: 3; grid-row: 1; }
  .ctrl-opts-scroll {
    grid-column: 1 / -1; grid-row: 2;
    display: flex;
    overflow-x: auto;
    scrollbar-width: none;
    align-items: center;
    gap: 6px;
    padding-bottom: 2px;
  }
  .ctrl-opts-scroll::-webkit-scrollbar { display: none; }
  .ctrl-opts-scroll .opts-divider { flex-shrink: 0; }

  /* ── Scales row: vertical stack so pills are visible ── */
  .scroller-row.scales-row {
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 4px 8px;
  }
  .sg-tabs {
    width: auto !important;
    flex-wrap: nowrap !important;
    overflow-x: auto;
    scrollbar-width: none;
    border-right: none;
    padding-right: 0;
    margin-right: 0;
  }
  .sg-tabs::-webkit-scrollbar { display: none; }
  .sg-tab { flex: 0 0 auto !important; }
  .panels-hz.scales-scroll {
    flex: none;
    width: 100%;
    overflow-x: auto;
    scrollbar-width: none;
  }
  .panels-hz.scales-scroll::-webkit-scrollbar { display: none; }

  /* ── Scale pills: horizontal scroll instead of wrap ── */
  .sg-panel { flex-wrap: nowrap; }
  .sg-panel .p { flex-shrink: 0; }

  /* ── Fretboard: left-align, compact padding ── */
  .fb-area { justify-content: flex-start; padding: 12px 0 8px; }

  /* ── Section padding ── */
  .scale-info { padding: 12px 16px; }
  .pos-bar { padding: 8px 16px; }
  .legend { padding: 8px 16px 12px; }

  /* ── Metro 3-col → single col on mobile ── */
  .metro-desk-grid {
    display: flex; flex-direction: column; align-items: center; gap: 16px;
  }
  .metro-dc-left,
  .metro-dc-right {
    display: none;
    width: 100%; max-width: 360px;
    align-items: center; border: none; padding: 0;
    background: rgba(255,255,255,0.03);
    border-radius: 12px; padding: 12px 16px; gap: 12px;
  }
  .metro-dc-left .metro-ctrl-grp,
  .metro-dc-right .metro-ctrl-grp { align-items: center; }
  .metro-desk-grid.mobile-adv-open .metro-dc-left,
  .metro-desk-grid.mobile-adv-open .metro-dc-right { display: flex; }
  .metro-mobile-only { display: grid !important; }
  .metro-ui-tack { max-width: 100%; }
  .metro-step-grid { max-width: 300px; }
  .metro-vol-slider { width: 160px; }
  .metro-select { min-width: 130px; }
}