:root {
  color-scheme: dark;
  --bg: #0b0c0e;
  --bg-elevated: #111318;
  --panel: #15181e;
  --panel-2: #1b1f27;
  --panel-3: #20252f;
  --text: #f5f3ed;
  --muted: #999fa9;
  --muted-2: #707784;
  --line: rgba(255,255,255,.09);
  --line-strong: rgba(255,255,255,.16);
  --root: #ffd84a;
  --root-ink: #1c1702;
  --scale: #5b83ea;
  --chord: #b27cf1;
  --focus: #43d6a1;
  --danger: #ff746a;
  --outside: #4b515b;
  --wood: #413526;
  --shadow: 0 24px 75px rgba(0,0,0,.28);
  --radius: 22px;
  --sidebar-width: 248px;
}

html[data-theme="light"] {
  color-scheme: light;
  --bg: #f0eee8;
  --bg-elevated: #f7f5ef;
  --panel: #fffdfa;
  --panel-2: #f3f0e9;
  --panel-3: #ebe7dd;
  --text: #17181a;
  --muted: #656a72;
  --muted-2: #8b8e93;
  --line: rgba(15,18,23,.10);
  --line-strong: rgba(15,18,23,.18);
  --outside: #c6c3bb;
  --shadow: 0 22px 60px rgba(44,37,22,.12);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  min-width: 320px;
  color: var(--text);
  background: var(--bg);
  font-family: Arial, "Noto Sans Hebrew", sans-serif;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
body.no-animations *, body.no-animations *::before, body.no-animations *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
button, select, input { font: inherit; }
button, select, input { color: inherit; }
button { cursor: pointer; }
button:focus-visible, select:focus-visible, input:focus-visible, [tabindex]:focus-visible { outline: 3px solid rgba(255,216,74,.72); outline-offset: 3px; }
[hidden] { display: none !important; }
.skip-link { position: fixed; z-index: 9999; top: 10px; right: 10px; padding: 10px 14px; transform: translateY(-150%); color: var(--root-ink); background: var(--root); border-radius: 9px; font-weight: 800; }
.skip-link:focus { transform: none; }

.kicker { margin: 0 0 9px; color: var(--root); font-size: 12px; font-weight: 900; letter-spacing: .08em; text-transform: uppercase; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 42px; padding: 0 16px; border: 1px solid var(--line-strong); border-radius: 12px; background: transparent; font-weight: 800; transition: transform .16s ease, border-color .16s ease, background .16s ease; }
.button:hover { transform: translateY(-1px); border-color: rgba(255,216,74,.45); }
.button.primary { color: var(--root-ink); border-color: var(--root); background: var(--root); }
.button.subtle { border-color: transparent; background: var(--panel-3); }
.button.ghost { color: var(--muted); }
.button.danger { color: #fff; border-color: transparent; background: #a53f3a; }
.button.large { min-height: 54px; padding-inline: 24px; border-radius: 15px; font-size: 16px; }
.icon-button { display: grid; place-items: center; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }

/* Welcome */
.welcome {
  position: fixed;
  z-index: 1000;
  inset: 0;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(450px, .98fr);
  gap: clamp(34px, 6vw, 100px);
  align-items: center;
  min-height: 100vh;
  padding: clamp(32px, 7vw, 100px);
  overflow: auto;
  color: #f8f6ef;
  background:
    radial-gradient(circle at 18% 15%, rgba(255,216,74,.12), transparent 28rem),
    radial-gradient(circle at 78% 82%, rgba(91,131,234,.08), transparent 30rem),
    #090a0c;
}
.welcome-glow { position: absolute; inset: 6% auto auto 8%; width: 28vw; height: 28vw; border: 1px solid rgba(255,216,74,.15); border-radius: 50%; box-shadow: 0 0 0 70px rgba(255,216,74,.016), 0 0 0 140px rgba(255,216,74,.012); pointer-events: none; }
.welcome-copy, .welcome-demo { position: relative; z-index: 1; }
.welcome h1 { margin: 0; max-width: 780px; font-size: clamp(56px, 7vw, 110px); line-height: .91; letter-spacing: -.065em; }
.welcome h1 em { color: var(--root); font-style: normal; }
.welcome-subtitle { max-width: 630px; margin: 28px 0 0; color: #b9bac0; font-size: clamp(18px, 2vw, 25px); }
.welcome-actions { display: flex; flex-wrap: wrap; gap: 11px; margin-top: 34px; }
.welcome-facts { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-top: 27px; color: #777b84; font-size: 12px; font-weight: 700; }
.welcome-facts i { width: 3px; height: 3px; border-radius: 50%; background: var(--root); }
.welcome-demo { padding: 24px; border: 1px solid rgba(255,255,255,.1); border-radius: 28px; background: rgba(23,25,30,.84); box-shadow: 0 40px 100px rgba(0,0,0,.35); backdrop-filter: blur(20px); }
.demo-caption { color: #a5a8b0; font-size: 12px; font-weight: 800; }
.live-dot { display: inline-block; width: 7px; height: 7px; margin-left: 6px; border-radius: 50%; background: var(--focus); box-shadow: 0 0 0 5px rgba(67,214,161,.1); animation: pulse 1.8s infinite; }
@keyframes pulse { 50% { box-shadow: 0 0 0 10px rgba(67,214,161,0); } }
.demo-guitar { display: grid; grid-template-columns: repeat(3, 1fr); gap: 8px; margin: 20px 0 16px; direction: ltr; }
.demo-guitar button { min-height: 90px; color: #e9e5da; border: 1px solid rgba(255,255,255,.08); border-radius: 14px; background: repeating-linear-gradient(90deg, #382d20, #3e3122 10px, #35291d 11px); }
.demo-guitar button small { display: block; color: #8f8b83; font-size: 10px; }
.demo-guitar button strong { display: grid; place-items: center; width: 38px; height: 38px; margin: 8px auto 0; border-radius: 50%; background: #3f4550; font-size: 15px; transition: .2s ease; }
.demo-guitar button.is-active strong { color: var(--root-ink); background: var(--root); transform: scale(1.12); }
.demo-bridge { display: flex; gap: 8px; align-items: center; margin: 13px 0; color: #6f737b; font-size: 10px; text-align: center; }
.demo-bridge span { flex: 1; height: 1px; background: rgba(255,255,255,.08); }
.demo-piano { position: relative; height: 128px; overflow: hidden; border-radius: 13px; background: #111; direction: ltr; }
.demo-piano button { position: absolute; top: 0; height: 100%; border: 1px solid #bebeb9; border-radius: 0 0 6px 6px; background: #f7f5ef; }
.demo-piano button.black { z-index: 2; height: 63%; border-color: #111; background: #1d2025; }
.demo-piano button.is-active { background: var(--root); box-shadow: inset 0 -8px 0 rgba(0,0,0,.12); }
.welcome-demo > p { margin: 16px 0 0; color: #a9abb2; text-align: center; font-size: 13px; }

/* Application lab */
.application-lab { display: grid; gap: 18px; }
.app-lab-selectors {
  display: grid;
  grid-template-columns: repeat(4, minmax(150px, 1fr));
  gap: 12px;
  padding: 14px;
  border: 1px solid rgba(255,216,74,.22);
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(255,216,74,.12), rgba(67,214,161,.05)), var(--panel);
}
.app-lab-selectors label, .app-loop-controls label { display: grid; gap: 6px; color: var(--muted); font-size: 12px; font-weight: 800; }
.app-lab-selectors select, .app-loop-controls input, .app-loop-controls select {
  min-height: 42px;
  border: 1px solid var(--line-strong);
  border-radius: 11px;
  background: var(--bg-elevated);
  padding: 0 12px;
}
.app-lab-grid { display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1.05fr); gap: 16px; align-items: start; }
.app-lab-panel {
  min-height: 220px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--panel);
  box-shadow: var(--shadow);
}
.app-lab-panel h3 { margin: 0; font-size: clamp(20px, 2vw, 28px); }
.app-lab-panel p { color: var(--muted); }
.app-route-panel { border-color: rgba(255,216,74,.24); background: linear-gradient(180deg, rgba(255,216,74,.08), transparent 44%), var(--panel); }
.app-loop-panel { border-color: rgba(67,214,161,.24); }
.app-loop-meta { margin: 8px 0 0; font-size: 12px; font-weight: 850; color: color-mix(in srgb, var(--muted) 82%, #fff); }
.app-session-chain { display: grid; gap: 7px; margin: 14px 0; padding: 12px; border: 1px solid rgba(255,255,255,.08); border-radius: 8px; background: rgba(255,255,255,.035); }
.app-session-chain span { font-size: 12px; font-weight: 800; color: var(--text); }
.app-route-columns { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.app-route-columns section, .app-project, .app-task-list, .app-verified-row, .app-definition-list > div, .app-transcription-answer {
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--panel-2);
}
.app-route-columns small, .app-project small, .app-task-list small, .app-transcription-answer small { display: block; margin-bottom: 8px; color: var(--root); font-weight: 900; }
.app-route-columns ul, .app-task-list ol, .app-task-list { margin: 0; padding-inline-start: 20px; color: var(--text); }
.app-project strong, .app-transcription-answer strong { display: block; font-size: 17px; }
.app-loop-controls { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; margin: 14px 0; }
.app-chord-strip { display: grid; grid-template-columns: repeat(auto-fit, minmax(130px, 1fr)); gap: 10px; margin: 12px 0; }
.app-chord-strip article {
  min-height: 112px;
  padding: 13px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg-elevated);
  transition: transform .16s ease, border-color .16s ease, background .16s ease;
}
.app-chord-strip article.is-active { color: var(--root-ink); border-color: var(--root); background: var(--root); transform: translateY(-2px); }
.app-chord-strip strong { display: block; font-size: 21px; }
.app-chord-strip small { color: inherit; opacity: .72; font-weight: 900; }
.app-chord-strip p { margin: 8px 0 0; color: inherit; opacity: .82; font-size: 12px; }
.app-verified-row { display: grid; grid-template-columns: auto 1fr; gap: 12px; align-items: center; margin-top: 12px; }
.app-definition-list { display: grid; gap: 10px; margin: 12px 0; }
.app-definition-list dt { color: var(--root); font-weight: 900; }
.app-definition-list dd { margin: 4px 0 0; color: var(--muted); }
.app-transcription-answer[hidden] { display: none; }
@media (max-width: 980px) {
  .app-lab-selectors, .app-lab-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 640px) {
  .app-lab-selectors, .app-lab-grid, .app-route-columns { grid-template-columns: 1fr; }
  .app-loop-controls, .app-verified-row { display: grid; grid-template-columns: 1fr; }
  .app-loop-controls > *, .app-verified-row > * { width: 100%; }
}

/* Shell and navigation */
.app-shell { min-height: 100vh; }
.sidebar { position: fixed; z-index: 200; top: 0; right: 0; bottom: 0; display: flex; flex-direction: column; width: var(--sidebar-width); padding: 24px 15px; border-left: 1px solid var(--line); background: var(--bg-elevated); }
.brand { display: flex; gap: 11px; align-items: center; padding: 0 8px 22px; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 42px; color: var(--root-ink); border-radius: 13px; background: var(--root); font-weight: 950; letter-spacing: -.05em; }
.brand strong, .brand small { display: block; }
.brand strong { font-size: 14px; }
.brand small { margin-top: 1px; color: var(--muted); font-size: 10px; }
.main-nav { display: grid; gap: 3px; }
.nav-item { display: flex; gap: 12px; align-items: center; min-height: 45px; padding: 0 12px; color: var(--muted); border: 0; border-radius: 11px; background: transparent; text-align: right; font-size: 13px; font-weight: 750; transition: .16s ease; }
.nav-item span { display: grid; place-items: center; width: 24px; color: var(--muted-2); font-size: 17px; }
.nav-item:hover { color: var(--text); background: var(--panel); }
.nav-item.is-active { color: var(--text); background: var(--panel-2); box-shadow: inset -3px 0 var(--root); }
.nav-item.is-active span { color: var(--root); }
.sidebar-progress { margin-top: auto; padding: 15px; border: 1px solid var(--line); border-radius: 14px; background: var(--panel); }
.sidebar-progress > div:first-child { display: flex; justify-content: space-between; color: var(--muted); font-size: 11px; }
.sidebar-progress strong { color: var(--text); }
.progress-track { height: 5px; margin-top: 10px; overflow: hidden; border-radius: 99px; background: var(--panel-3); }
.progress-track i { display: block; width: 0; height: 100%; border-radius: inherit; background: var(--root); transition: width .3s ease; }
.sidebar-close { display: none; }
.sidebar-backdrop { display: none; }
.app-column { min-height: 100vh; margin-right: var(--sidebar-width); }
.topbar { position: sticky; z-index: 100; top: 0; display: flex; justify-content: space-between; align-items: center; height: 72px; padding: 0 clamp(20px, 4vw, 52px); border-bottom: 1px solid var(--line); background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(18px); }
.topbar-title small, .topbar-title strong { display: block; }
.topbar-title small { color: var(--root); font-size: 9px; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; }
.topbar-title strong { font-size: 15px; }
.topbar-actions { display: flex; gap: 8px; }
.sound-status { display: inline-flex; gap: 8px; align-items: center; height: 42px; padding: 0 13px; border: 1px solid var(--line); border-radius: 12px; background: var(--panel); }
.sound-status span { color: var(--root); }
.sound-status b { font-size: 11px; }
.mobile-menu { display: none; }
main { width: min(1500px, 100%); margin-inline: auto; padding: 42px clamp(20px, 4vw, 52px) 100px; }
.screen { display: none; animation: screenIn .22s ease both; }
.screen.is-active { display: block; }
@keyframes screenIn { from { opacity: 0; transform: translateY(8px); } }
.screen-heading { display: flex; justify-content: space-between; gap: 32px; align-items: flex-end; margin-bottom: 30px; }
.screen-heading h2 { margin: 0; font-size: clamp(34px, 4.3vw, 64px); line-height: 1.03; letter-spacing: -.055em; }
.screen-heading p:last-child { max-width: 720px; margin: 13px 0 0; color: var(--muted); font-size: 16px; }
.screen-number { color: transparent; -webkit-text-stroke: 1px var(--line-strong); font-size: 76px; font-weight: 950; line-height: .8; letter-spacing: -.08em; }
.mobile-bottom-nav { display: none; }

/* Shared cards and controls */
.control-card, .instrument-card, .info-card, .data-card, .explanation-card, .analysis-card, .formula-card, .chord-builder-card, .recognizer-result, .exercise-card, .lesson-content, .settings-card, .danger-zone { border: 1px solid var(--line); border-radius: var(--radius); background: var(--panel); box-shadow: 0 14px 44px rgba(0,0,0,.08); }
.toolbar { display: flex; flex-wrap: wrap; gap: 12px; align-items: end; margin-bottom: 18px; padding: 16px; }
.toolbar label, .practice-dashboard label, .chord-builder-card label, .settings-card label { display: grid; gap: 6px; min-width: 145px; }
label > span, .control-label { color: var(--muted); font-size: 11px; font-weight: 850; }
select, input[type="number"] { min-height: 42px; padding: 0 36px 0 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel-2); font-weight: 750; }
select { width: 100%; min-width: 0; max-width: 100%; }
input[type="number"] { padding: 0 11px; }
input[type="range"] { width: 100%; accent-color: var(--root); }
.toggle-label { display: flex !important; flex-direction: row; align-items: center; min-height: 42px; padding: 0 12px; border: 1px solid var(--line); border-radius: 10px; background: var(--panel-2); }
.toggle-label input, .switch-row input { width: 18px; height: 18px; accent-color: var(--root); }
.instrument-card { margin-top: 16px; overflow: hidden; }
.instrument-head { display: flex; justify-content: space-between; gap: 20px; align-items: center; padding: 18px 20px 13px; }
.instrument-head > div { display: flex; gap: 10px; align-items: center; }
.instrument-head h3 { margin: 0; font-size: 17px; }
.instrument-head p { margin: 0; color: var(--muted); font-size: 11px; }
.instrument-index { display: grid; place-items: center; width: 26px; height: 26px; color: var(--root); border: 1px solid rgba(255,216,74,.3); border-radius: 8px; font-size: 10px; font-weight: 900; }
.two-column { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.section-mini-heading { display: flex; justify-content: space-between; gap: 20px; align-items: end; }
.section-mini-heading h3 { margin: 0; }
.section-mini-heading span { color: var(--muted); font-size: 11px; }

/* Guitar */
.guitar-view { min-width: 0; overflow-x: auto; scrollbar-color: var(--outside) transparent; scrollbar-width: thin; }
.guitar-view > .guitar-board { overflow: visible; }
.guitar-board { min-width: calc(var(--fret-columns) * 62px + 58px); padding-bottom: 6px; direction: ltr; background: linear-gradient(180deg, #3b3022, #4b3b27 48%, #382d20); }
.guitar-string-row, .guitar-fret-labels { display: grid; grid-template-columns: 58px repeat(var(--fret-columns), minmax(57px, 1fr)); }
.guitar-string-label { position: sticky; z-index: 8; left: 0; display: grid; place-content: center; min-height: 55px; color: #f2ede4; border-bottom: 1px solid rgba(255,255,255,.07); background: #14161a; text-align: center; }
.guitar-string-label strong { font-size: 13px; }
.guitar-string-label small { color: #777c85; font-size: 8px; }
.guitar-note { position: relative; min-height: 55px; padding: 0; overflow: visible; touch-action: manipulation; user-select: none; border: 0; border-left: 2px solid rgba(225,217,199,.24); border-bottom: 1px solid rgba(40,28,13,.15); background: repeating-linear-gradient(90deg, rgba(255,255,255,.012), rgba(255,255,255,.012) 9px, rgba(0,0,0,.013) 10px); }
.guitar-note.is-open { background: rgba(16,18,21,.17); border-left: 4px solid rgba(235,229,218,.72); }
.guitar-string-line { position: absolute; z-index: 1; top: 50%; right: 0; left: 0; height: var(--string-weight); transform: translateY(-50%); background: linear-gradient(#f9f7f0, #87847d, #f3f0e7); box-shadow: 0 1px 2px rgba(0,0,0,.42); }
.note-marker { position: relative; z-index: 3; display: grid; place-content: center; width: 38px; height: 38px; margin: auto; color: #d7d9dd; border: 1px solid rgba(255,255,255,.10); border-radius: 50%; background: var(--outside); box-shadow: 0 5px 15px rgba(0,0,0,.22); transition: transform .14s ease, box-shadow .14s ease, opacity .14s ease; }
.note-marker > span { font-size: 10px; font-weight: 950; line-height: 1; }
.note-marker small { margin-top: 3px; color: currentColor; opacity: .72; font-size: 7px; font-weight: 850; line-height: 1; }
.guitar-note:hover .note-marker, .guitar-note:focus-visible .note-marker { transform: scale(1.14); box-shadow: 0 7px 22px rgba(0,0,0,.3); }
.guitar-note:active .note-marker { transform: scale(.94); }
.guitar-note.is-root .note-marker { color: var(--root-ink); border-color: transparent; background: var(--root); }
.guitar-note.is-scale .note-marker { color: #fff; background: var(--scale); }
.guitar-note.is-chord .note-marker { color: #fff; background: var(--chord); }
.guitar-note.is-dimmed .note-marker { opacity: .12; transform: scale(.75); }
.guitar-note.is-focus .note-marker { color: #071b14; border-color: #d8fff2; background: var(--focus); box-shadow: 0 0 0 5px rgba(67,214,161,.16), 0 6px 18px rgba(0,0,0,.3); transform: scale(1.13); }
.guitar-note.is-user-selected .note-marker { color: #071b14; background: var(--focus); box-shadow: 0 0 0 4px rgba(67,214,161,.16); }
.guitar-note.is-correct .note-marker { color: #081b0e; background: #73dfa0; box-shadow: 0 0 0 4px rgba(115,223,160,.18); }
.guitar-note.is-wrong .note-marker { color: #fff; background: var(--danger); box-shadow: 0 0 0 4px rgba(255,116,106,.18); }
.guitar-note.is-question .note-marker { color: var(--root-ink); background: var(--root); animation: questionPulse 1.4s infinite; }
@keyframes questionPulse { 50% { box-shadow: 0 0 0 8px rgba(255,216,74,0); } }
.guitar-fret-labels { position: relative; color: #8f8a80; background: #17191d; }
.guitar-fret-labels span { position: relative; display: grid; place-items: center; min-height: 28px; font-size: 9px; font-weight: 800; }
.guitar-fret-labels span:first-child { position: sticky; z-index: 8; left: 0; background: #14161a; }
.guitar-fret-labels .has-dot::after { content: ""; position: absolute; top: 3px; width: 4px; height: 4px; border-radius: 50%; background: var(--root); }
.guitar-fret-labels .double-dot::before { content: "• •"; position: absolute; top: -5px; color: var(--root); letter-spacing: 8px; transform: translateX(4px); }
.guitar-view.is-compact .guitar-board { min-width: calc(var(--fret-columns) * 40px + 45px); }
.guitar-view.is-compact .guitar-string-row, .guitar-view.is-compact .guitar-fret-labels { grid-template-columns: 45px repeat(var(--fret-columns), minmax(38px, 1fr)); }
.guitar-view.is-compact .guitar-note, .guitar-view.is-compact .guitar-string-label { min-height: 42px; }
.guitar-view.is-compact .note-marker { width: 29px; height: 29px; }

/* Piano */
.piano-view { padding: 0 20px 20px; overflow-x: auto; }
.piano-board { position: relative; min-width: 760px; height: 180px; overflow: hidden; border: 1px solid #303237; border-radius: 14px; background: #0b0c0d; direction: ltr; box-shadow: inset 0 -12px 24px rgba(0,0,0,.25); }
.piano-key { position: absolute; top: 0; display: grid; align-content: end; justify-items: center; padding: 0 2px 13px; touch-action: manipulation; user-select: none; transition: transform .13s ease, background .13s ease; }
.piano-key.is-white { z-index: 1; height: 100%; color: #454951; border: 1px solid #aaa9a4; border-top: 0; border-radius: 0 0 7px 7px; background: linear-gradient(90deg, #e9e7e1, #fffef9 13%, #f6f4ee 88%, #ceccc7); }
.piano-key.is-black { z-index: 3; height: 62%; padding-bottom: 10px; color: #a4a6ab; border: 1px solid #070709; border-radius: 0 0 6px 6px; background: linear-gradient(90deg, #111317, #30343a 58%, #0b0c0f); box-shadow: 0 8px 10px rgba(0,0,0,.32); }
.piano-key span { font-size: 11px; font-weight: 950; }
.piano-key small { margin-top: 4px; font-size: 8px; font-weight: 850; opacity: .7; }
.piano-key:hover { transform: translateY(2px); }
.piano-key.is-scale { color: #fff; background: linear-gradient(180deg, color-mix(in srgb, var(--scale) 42%, #fff), var(--scale)); }
.piano-key.is-chord { color: #fff; background: linear-gradient(180deg, color-mix(in srgb, var(--chord) 32%, #fff), var(--chord)); }
.piano-key.is-root { color: var(--root-ink); background: linear-gradient(180deg, #ffef9c, var(--root)); }
.piano-key.is-focus, .piano-key.is-user-selected { color: #071b14; background: linear-gradient(180deg, #c7ffeb, var(--focus)); box-shadow: inset 0 -9px 0 rgba(0,0,0,.1), 0 0 0 3px rgba(67,214,161,.2); }
.octave-line { display: grid; grid-template-columns: 1fr 1fr; min-width: 760px; color: var(--muted); text-align: center; font-size: 9px; }
.octave-line span { position: relative; padding-top: 8px; }
.octave-line span::before { content: ""; position: absolute; top: 0; right: 8%; left: 8%; height: 1px; background: var(--line-strong); }
.piano-view.is-compact { padding: 0; }
.piano-view.is-compact .piano-board { min-width: 610px; height: 130px; }
.piano-view.is-compact .octave-line { min-width: 610px; }

/* Explore and notes */
.inspector-grid { display: grid; grid-template-columns: .75fr .75fr 1.5fr; gap: 14px; margin-top: 16px; }
.inspector-card { min-height: 126px; padding: 19px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); }
.inspector-card p { margin: 0 0 8px; color: var(--muted); font-size: 11px; font-weight: 800; }
.inspector-card > strong { display: block; font-size: 27px; letter-spacing: -.03em; }
.inspector-card > span, .inspector-card div span { color: var(--muted); font-size: 12px; }
.note-inspector strong { color: var(--root); font-size: 42px; direction: ltr; }
.note-inspector div { display: flex; gap: 10px; justify-content: space-between; }
.metric-strip { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 16px 0; overflow: hidden; border: 1px solid var(--line); border-radius: 18px; background: var(--line); }
.metric-strip > div { padding: 18px; background: var(--panel); }
.metric-strip small, .metric-strip strong { display: block; }
.metric-strip small { color: var(--muted); }
.metric-strip strong { margin-top: 5px; font-size: 24px; }
.explanation-card { margin-top: 16px; padding: 22px; }
.explanation-card h3 { margin: 0 0 6px; }
.explanation-card p { margin: 0; color: var(--muted); }

/* Intervals */
.interval-hero { display: grid; grid-template-columns: 120px minmax(130px,1fr) 120px minmax(220px,1.2fr); gap: 13px; align-items: stretch; margin: 16px 0; direction: ltr; }
.interval-hero > div, .interval-hero > article, .interval-arrow { display: grid; place-content: center; min-height: 122px; padding: 16px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); text-align: center; }
.interval-hero small { color: var(--muted); font-size: 10px; }
.interval-hero strong { font-size: 38px; }
.interval-arrow { position: relative; color: var(--root); }
.interval-arrow::before { content: ""; position: absolute; top: 50%; right: 10%; left: 10%; height: 1px; background: rgba(255,216,74,.35); }
.interval-arrow b, .interval-arrow small { position: relative; z-index: 1; justify-self: center; padding: 0 8px; background: var(--panel); }
.interval-hero > article { display: flex; gap: 15px; align-items: center; justify-content: center; direction: rtl; text-align: right; }
.interval-hero > article > span { display: grid; place-items: center; width: 52px; height: 52px; color: var(--root-ink); border-radius: 50%; background: var(--root); font-size: 19px; font-weight: 950; }
.interval-hero article strong, .interval-hero article small { display: block; }
.interval-hero article strong { font-size: 17px; }
.info-card { margin-top: 16px; padding: 22px; }
.info-card h3 { margin: 0 0 14px; }
.shape-list { display: grid; gap: 7px; }
.shape-item { display: flex; justify-content: space-between; gap: 15px; padding: 9px 11px; border-radius: 9px; background: var(--panel-2); font-size: 12px; }
.shape-item strong { color: var(--root); direction: ltr; }
.analysis-card { display: flex; justify-content: space-between; gap: 20px; align-items: center; margin-top: 16px; padding: 20px; }
.analysis-card span { color: var(--muted); }
.analysis-card.is-active { border-color: rgba(67,214,161,.4); box-shadow: inset 4px 0 var(--focus); }

/* Scales */
.formula-card { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; padding: 19px; }
.formula-card small, .chord-builder-card small { display: block; margin-bottom: 9px; color: var(--muted); font-weight: 800; }
.formula-pills { display: flex; flex-wrap: wrap; gap: 7px; direction: ltr; }
.formula-pills span, .formula-pills button { display: inline-flex; align-items: center; justify-content: center; min-width: 38px; min-height: 31px; padding: 0 10px; color: #fff; border: 0; border-radius: 999px; background: var(--scale); font-size: 11px; font-weight: 900; }
.formula-pills span:first-child { color: var(--root-ink); background: var(--root); }
.formula-pills.notes span { min-width: 44px; color: var(--text); background: var(--panel-3); }
.step-line { display: flex; gap: 0; align-items: center; margin: 14px 0; overflow-x: auto; direction: ltr; }
.step-line .step-note { display: grid; place-items: center; flex: 0 0 38px; height: 38px; color: var(--root-ink); border-radius: 50%; background: var(--root); font-weight: 950; }
.step-line .step-gap { position: relative; flex: 1 0 82px; color: var(--muted); text-align: center; font-size: 9px; }
.step-line .step-gap::before { content: ""; position: absolute; top: 50%; right: 4px; left: 4px; height: 1px; background: var(--line-strong); }
.step-line .step-gap span { position: relative; padding: 0 7px; background: var(--bg); }

/* Chords */
.chord-builder-card { display: grid; grid-template-columns: minmax(280px,1fr) 170px auto auto; gap: 14px; align-items: end; margin-bottom: 16px; padding: 17px; }
.formula-pills.interactive button { background: var(--chord); }
.formula-pills.interactive button.is-omitted { color: var(--muted); text-decoration: line-through; background: var(--panel-3); opacity: .65; }
.recognizer-result { margin-bottom: 16px; padding: 18px; border-color: rgba(67,214,161,.35); }
.recognizer-result small, .recognizer-result strong { display: block; }
.recognizer-result small { color: var(--focus); }
.recognizer-result strong { margin: 4px 0 8px; font-size: 25px; }
#recognizerAlternatives { display: flex; flex-wrap: wrap; gap: 7px; }
#recognizerAlternatives span { padding: 5px 9px; border-radius: 999px; background: var(--panel-3); color: var(--muted); font-size: 11px; }
.voicings-section { margin-top: 20px; padding: 20px 0; }
.voicing-list { display: grid; grid-template-columns: repeat(4,1fr); gap: 11px; margin-top: 14px; }
.voicing-card { padding: 15px; color: var(--text); border: 1px solid var(--line); border-radius: 14px; background: var(--panel); text-align: right; }
.voicing-card:hover { border-color: rgba(178,124,241,.5); }
.voicing-card small { color: var(--muted); }
.voicing-frets { display: flex; gap: 5px; margin-top: 10px; direction: ltr; }
.voicing-frets span { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 8px; background: var(--panel-3); font-size: 11px; font-weight: 900; }

/* Practice */
.practice-dashboard { display: grid; grid-template-columns: minmax(210px,1.5fr) repeat(3,1fr); gap: 1px; overflow: hidden; margin-bottom: 16px; border: 1px solid var(--line); border-radius: 18px; background: var(--line); }
.practice-dashboard > * { display: grid; align-content: center; min-height: 78px; padding: 13px 17px; background: var(--panel); }
.practice-dashboard small { color: var(--muted); }
.practice-dashboard strong { font-size: 22px; }
.exercise-card { position: relative; overflow: hidden; padding: clamp(20px, 4vw, 35px); }
.exercise-card::before { content: ""; position: absolute; width: 280px; height: 280px; top: -170px; left: -80px; border-radius: 50%; background: rgba(255,216,74,.06); }
.exercise-copy { position: relative; }
.exercise-copy h3 { margin: 0; max-width: 850px; font-size: clamp(25px, 3vw, 40px); line-height: 1.15; }
.exercise-copy > p:last-child { color: var(--muted); }
.exercise-options { display: grid; grid-template-columns: repeat(4,1fr); gap: 9px; margin-top: 22px; }
.option-button { min-height: 54px; padding: 8px; border: 1px solid var(--line); border-radius: 13px; background: var(--panel-2); font-weight: 850; }
.option-button:hover { border-color: var(--root); }
.option-button.is-correct { color: #082113; border-color: #73dfa0; background: #73dfa0; }
.option-button.is-wrong { color: #fff; border-color: var(--danger); background: #973e39; }
.exercise-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 20px; }
.exercise-feedback { min-height: 26px; margin-top: 15px; font-weight: 800; }
.exercise-feedback.good { color: #73dfa0; }
.exercise-feedback.bad { color: var(--danger); }

/* Learning */
.learning-layout { display: grid; grid-template-columns: 275px minmax(0,1fr); gap: 16px; }
.lesson-list { display: grid; gap: 5px; align-content: start; max-height: calc(100vh - 150px); overflow-y: auto; }
.lesson-item { display: grid; grid-template-columns: 30px 1fr auto; gap: 9px; align-items: center; min-height: 58px; padding: 8px 10px; color: var(--muted); border: 1px solid transparent; border-radius: 12px; background: transparent; text-align: right; }
.lesson-item:hover { background: var(--panel); }
.lesson-item.is-active { color: var(--text); border-color: var(--line); background: var(--panel); }
.lesson-item.is-complete .lesson-index { color: var(--root-ink); background: var(--root); }
.lesson-index { display: grid; place-items: center; width: 28px; height: 28px; border-radius: 9px; background: var(--panel-3); font-size: 10px; font-weight: 900; }
.lesson-item strong { font-size: 12px; }
.lesson-item small { font-size: 9px; }
.lesson-content { padding: clamp(20px,4vw,38px); }
.lesson-meta { display: flex; gap: 8px; color: var(--muted); font-size: 10px; font-weight: 800; }
.lesson-meta span { padding: 5px 8px; border-radius: 999px; background: var(--panel-3); }
.lesson-content > h3 { margin: 18px 0 10px; font-size: clamp(28px,3vw,42px); }
.lesson-content > p { max-width: 850px; color: var(--muted); font-size: 16px; }
.lesson-example { display: grid; grid-template-columns: 1fr auto; gap: 6px 14px; align-items: center; margin: 22px 0; padding: 16px; border-right: 3px solid var(--root); border-radius: 11px; background: var(--panel-2); }
.lesson-example small { color: var(--root); }
.lesson-example strong { font-size: 13px; }
.lesson-example button { grid-column: 2; grid-row: 1/3; }
.mini-instruments { display: grid; gap: 12px; }
.mini-instruments > div > span { display: block; margin-bottom: 6px; color: var(--muted); font-size: 10px; font-weight: 800; }
.lesson-quiz { margin-top: 22px; padding: 20px; border: 1px solid var(--line); border-radius: 16px; background: var(--panel-2); }
.lesson-quiz h4 { margin: 0 0 13px; font-size: 18px; }
.lesson-quiz #lessonQuizOptions { display: flex; flex-wrap: wrap; gap: 8px; }
.lesson-quiz #lessonQuizFeedback { margin-bottom: 0; font-weight: 800; }
.lesson-navigation { display: flex; justify-content: space-between; gap: 9px; margin-top: 22px; }

/* Stats */
.stats-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 11px; }
.stat-card { min-height: 120px; padding: 18px; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); }
.stat-card small, .stat-card strong, .stat-card span { display: block; }
.stat-card small { color: var(--muted); }
.stat-card strong { margin: 8px 0 2px; font-size: 32px; }
.stat-card span { color: var(--muted); font-size: 10px; }
.stats-columns { margin-top: 16px; }
.data-card { padding: 20px; }
.bar-list { display: grid; gap: 11px; margin-top: 17px; }
.bar-item { display: grid; grid-template-columns: 110px 1fr 52px; gap: 10px; align-items: center; font-size: 11px; }
.bar-track { height: 7px; overflow: hidden; border-radius: 99px; background: var(--panel-3); }
.bar-track i { display: block; height: 100%; border-radius: inherit; background: var(--scale); }
.bar-item b { text-align: left; direction: ltr; }
.weak-list { display: grid; gap: 8px; margin-top: 17px; }
.weak-item { display: flex; justify-content: space-between; gap: 15px; padding: 11px; border-radius: 10px; background: var(--panel-2); }
.weak-item span { color: var(--muted); font-size: 11px; }
.history-table { margin-top: 16px; overflow-x: auto; }
.history-row { display: grid; grid-template-columns: 1.2fr .8fr .7fr .7fr; gap: 12px; min-width: 580px; padding: 10px 5px; border-bottom: 1px solid var(--line); font-size: 11px; }
.history-row.header { color: var(--muted); font-weight: 800; }
.history-row .success { color: #73dfa0; }
.history-row .failure { color: var(--danger); }
.empty-state { padding: 30px; color: var(--muted); border: 1px dashed var(--line-strong); border-radius: 13px; text-align: center; }

/* Settings */
.settings-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
.settings-card { display: grid; gap: 14px; margin: 0; padding: 22px; }
.settings-card legend { padding: 0 8px; font-size: 18px; font-weight: 900; }
.settings-card label { grid-template-columns: 1fr minmax(170px,.8fr); align-items: center; }
.settings-card .switch-row { display: flex; flex-direction: row; justify-content: space-between; }
.range-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 9px; }
.range-pair label { grid-template-columns: 1fr !important; }
.danger-zone { display: flex; justify-content: space-between; gap: 20px; align-items: center; margin-top: 16px; padding: 21px; border-color: rgba(255,116,106,.28); }
.danger-zone p { margin: 3px 0 0; color: var(--muted); }
.danger-zone > div:last-child { display: flex; gap: 8px; }

/* Legend, toast */
.global-legend { position: fixed; z-index: 90; right: calc(var(--sidebar-width) + 22px); bottom: 18px; display: flex; flex-wrap: wrap; gap: 11px; padding: 9px 13px; border: 1px solid var(--line); border-radius: 999px; background: color-mix(in srgb, var(--bg-elevated) 88%, transparent); box-shadow: var(--shadow); backdrop-filter: blur(18px); }
.global-legend span { display: inline-flex; gap: 5px; align-items: center; color: var(--muted); font-size: 9px; font-weight: 800; }
.global-legend i { width: 8px; height: 8px; border-radius: 50%; background: var(--outside); }
.global-legend .root { background: var(--root); }.global-legend .chord { background: var(--chord); }.global-legend .scale { background: var(--scale); }.global-legend .focus { background: var(--focus); }
.toast { position: fixed; z-index: 2000; right: 50%; bottom: 26px; max-width: min(430px, calc(100% - 30px)); padding: 12px 16px; transform: translate(50%, 130%); color: var(--text); border: 1px solid var(--line-strong); border-radius: 12px; background: var(--panel-3); box-shadow: var(--shadow); font-size: 12px; font-weight: 800; transition: transform .2s ease; }
.toast.is-visible { transform: translate(50%, 0); }

@media (max-width: 1100px) {
  .welcome { grid-template-columns: 1fr; }
  .welcome-copy { padding-top: 25px; }
  .welcome-demo { max-width: 720px; }
  .inspector-grid { grid-template-columns: 1fr 1fr; }
  .inspector-card.wide { grid-column: 1 / -1; }
  .interval-hero { grid-template-columns: 1fr 1fr 1fr; }
  .interval-hero > article { grid-column: 1 / -1; }
  .chord-builder-card { grid-template-columns: 1fr 1fr; }
  .voicing-list { grid-template-columns: 1fr 1fr; }
  .stats-grid { grid-template-columns: repeat(3,1fr); }
}

@media (max-width: 860px) {
  :root { --sidebar-width: 270px; }
  .sidebar { right: 0; left: auto; display: none; box-shadow: var(--shadow); }
  .sidebar.is-open { display: flex; }
  .sidebar-close { position: absolute; top: 13px; left: 13px; display: grid; place-items: center; width: 34px; height: 34px; color: var(--muted); border: 0; background: transparent; font-size: 25px; }
  .sidebar-backdrop { position: fixed; z-index: 190; inset: 0; border: 0; background: rgba(0,0,0,.58); }
  .sidebar-backdrop.is-visible { display: block; }
  .app-column { margin-right: 0; }
  .mobile-menu { display: grid; }
  .topbar-title { margin-inline-end: auto; margin-inline-start: 12px; }
  main { padding-bottom: 125px; }
  .global-legend { position: static; justify-content: center; margin: 0 20px 86px; border-radius: 14px; }
  .mobile-bottom-nav { position: fixed; z-index: 150; right: 10px; bottom: 10px; left: 10px; display: grid; grid-template-columns: repeat(5,1fr); min-height: 65px; padding: 5px; border: 1px solid var(--line); border-radius: 18px; background: color-mix(in srgb, var(--bg-elevated) 92%, transparent); box-shadow: var(--shadow); backdrop-filter: blur(20px); }
  .mobile-bottom-nav button { display: grid; place-content: center; gap: 2px; color: var(--muted); border: 0; border-radius: 12px; background: transparent; font-size: 9px; font-weight: 800; }
  .mobile-bottom-nav button span { font-size: 17px; }
  .mobile-bottom-nav button.is-active { color: var(--root); background: var(--panel-2); }
  .two-column, .learning-layout { grid-template-columns: 1fr; }
  .lesson-list { display: flex; max-height: none; overflow-x: auto; }
  .lesson-item { flex: 0 0 210px; }
  .settings-grid { grid-template-columns: 1fr; }
}

@media (max-width: 620px) {
  .welcome { display: block; padding: 35px 18px 70px; }
  .welcome h1 { margin-top: 20px; font-size: clamp(52px, 18vw, 76px); }
  .welcome-actions { display: grid; }
  .welcome-demo { margin-top: 45px; padding: 16px; }
  .demo-piano { height: 100px; }
  .topbar { height: 64px; padding-inline: 14px; }
  .sound-status b { display: none; }
  main { padding: 28px 12px 110px; }
  .screen-heading { align-items: flex-start; }
  .screen-heading h2 { font-size: 38px; }
  .screen-number { display: none; }
  .screen-heading p:last-child { font-size: 14px; }
  .toolbar { padding: 12px; }
  .toolbar label { flex: 1 1 130px; min-width: 0; }
  .toolbar .button { flex: 1 1 auto; }
  .instrument-head { align-items: flex-start; padding-inline: 14px; }
  .instrument-head p { max-width: 130px; text-align: left; }
  .guitar-board { min-width: calc(var(--fret-columns) * 54px + 50px); }
  .guitar-string-row, .guitar-fret-labels { grid-template-columns: 50px repeat(var(--fret-columns), minmax(50px,1fr)); }
  .piano-view { padding-inline: 12px; }
  .piano-board, .octave-line { min-width: 680px; }
  .inspector-grid, .metric-strip, .formula-card { grid-template-columns: 1fr; }
  .inspector-card.wide { grid-column: auto; }
  .interval-hero { grid-template-columns: 1fr 1fr; }
  .interval-arrow { grid-column: 1 / -1; min-height: 85px; grid-row: 2; }
  .interval-hero > article { grid-column: 1 / -1; }
  .analysis-card, .danger-zone { align-items: flex-start; flex-direction: column; }
  .chord-builder-card { grid-template-columns: 1fr; }
  .voicing-list { grid-template-columns: 1fr; }
  .practice-dashboard { grid-template-columns: 1fr 1fr 1fr; }
  .practice-dashboard label { grid-column: 1 / -1; }
  .exercise-options { grid-template-columns: 1fr 1fr; }
  .lesson-content { padding: 18px; }
  .lesson-example { grid-template-columns: 1fr; }
  .lesson-example button { grid-column: auto; grid-row: auto; }
  .stats-grid { grid-template-columns: 1fr 1fr; }
  .stats-columns { grid-template-columns: 1fr; }
  .settings-card label { grid-template-columns: 1fr; }
  .danger-zone > div:last-child { width: 100%; flex-direction: column; }
  .bar-item { grid-template-columns: 88px 1fr 45px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* Studio edition: warm, physical, and restrained */
:root { --bg:#100e0c; --bg-elevated:#171411; --panel:#1d1915; --panel-2:#252019; --panel-3:#30281e; --text:#f3ecdd; --muted:#afa494; --muted-2:#7e7468; --line:rgba(244,226,193,.1); --line-strong:rgba(226,199,150,.22); --root:#d8ad59; --root-ink:#1b1308; --scale:#778ca5; --chord:#a77967; --focus:#9eb88c; --wood:#5b3d25; --radius:18px; }
body { background-color:var(--bg); background-image:linear-gradient(rgba(255,255,255,.012) 1px,transparent 1px),radial-gradient(circle at 76% 8%,rgba(133,82,41,.10),transparent 32rem); background-size:100% 5px,auto; }
.sidebar { background:linear-gradient(180deg,#171411,#110f0d); box-shadow:-14px 0 40px rgba(0,0,0,.18); }
.brand-mark,.instrument-index { border-radius:4px 11px 4px 11px; transform:rotate(-2deg); background:var(--root); color:var(--root-ink); }
.nav-item { border-radius:9px; }
.nav-item.is-active { background:linear-gradient(90deg,rgba(216,173,89,.15),rgba(216,173,89,.03)); box-shadow:inset -3px 0 var(--root); }
.instrument-card,.amp-card,.game-console { background-color:var(--panel); background-image:repeating-linear-gradient(45deg,rgba(255,255,255,.012),rgba(255,255,255,.012) 1px,transparent 1px,transparent 4px); }
.guitar-board { background:linear-gradient(180deg,rgba(255,255,255,.05),transparent 12%),repeating-linear-gradient(90deg,rgba(255,255,255,.015),rgba(255,255,255,.015) 2px,rgba(0,0,0,.018) 3px,rgba(0,0,0,.018) 7px),linear-gradient(180deg,#5a3a22,#6a472b 48%,#4f321e); }
.note-marker { width:44px; min-width:44px; height:30px; border-radius:7px 12px 7px 12px; border:1px solid rgba(244,226,193,.32); background:rgba(20,17,14,.82); box-shadow:0 3px 0 rgba(0,0,0,.24); }
.guitar-note::before { filter:drop-shadow(0 1px 1px rgba(0,0,0,.7)); }
.guitar-note.is-ringing .note-marker,.piano-key.is-ringing { animation:ringNote .3s ease; }
@keyframes ringNote { 50%{transform:scale(1.18);filter:brightness(1.3)} }
.fret-inlay { position:absolute; z-index:0; width:10px; height:10px; border-radius:50%; background:radial-gradient(circle at 35% 30%,#f3e8d1,#9b8a70); box-shadow:0 1px 4px #000; }

.onboarding { position:fixed; z-index:1200; inset:0; display:grid; place-items:center; padding:22px; background:rgba(10,8,7,.88); backdrop-filter:blur(18px); }
.onboarding-panel { width:min(780px,100%); padding:clamp(24px,5vw,52px); border:1px solid var(--line-strong); border-radius:26px; background:linear-gradient(145deg,#241d16,#171310); box-shadow:0 35px 100px #000; }
.onboarding-panel h2 { margin:0; font:700 clamp(34px,5vw,56px)/1.05 Georgia,serif; }
.onboarding-panel>p:not(.kicker) { color:var(--muted); }
.onboarding-grid { display:grid; grid-template-columns:1fr 1fr; gap:14px; margin:28px 0; }
.onboarding-grid label,.game-settings label { display:grid; gap:7px; color:var(--muted); font-size:12px; }

.dashboard-hero { display:grid; grid-template-columns:1fr auto; gap:28px; align-items:center; min-height:300px; padding:clamp(24px,5vw,58px); border:1px solid var(--line); border-radius:26px; background:radial-gradient(circle at 10% 10%,rgba(216,173,89,.14),transparent 26rem),linear-gradient(135deg,#291f16,#141210 72%); box-shadow:var(--shadow); }
.dashboard-hero h2 { max-width:760px; margin:8px 0; font:700 clamp(42px,6vw,76px)/.98 Georgia,serif; }
.dashboard-hero>div>p:not(.kicker){color:var(--muted)} .dashboard-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:28px}
.level-dial { display:grid; place-items:center; width:150px; aspect-ratio:1; border:9px double #71624e; border-radius:50%; background:radial-gradient(circle,#28221b 30%,#111 68%); box-shadow:inset 0 0 30px #000,0 12px 35px #000; }
.level-dial small,.level-dial span{color:var(--muted);font-size:10px}.level-dial strong{font:700 52px/1 Georgia,serif;color:var(--root)}
.dashboard-metrics { display:grid; grid-template-columns:repeat(4,1fr); gap:12px; margin-top:14px; }
.dashboard-metrics article { display:grid; gap:5px; min-height:112px; padding:18px; border:1px solid var(--line); border-radius:14px; background:var(--panel); }
.dashboard-metrics small,.dashboard-metrics span{color:var(--muted);font-size:11px}.dashboard-metrics strong{font-size:21px}
.dashboard-grid { display:grid; grid-template-columns:1.2fr .8fr; gap:14px; margin-top:14px; }.dashboard-grid>article{min-height:230px;padding:22px}.amp-card{border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.pick-badge{padding:8px 12px;border-radius:4px 12px;background:var(--root);color:var(--root-ink);font-weight:900}.next-lesson{display:block;margin:22px 0 8px;font:700 27px Georgia,serif}.week-chart{display:flex;align-items:end;gap:9px;height:150px;padding-top:16px}.week-chart div{display:grid;grid-template-rows:1fr auto auto;gap:2px;align-items:end;width:100%;height:100%;text-align:center}.week-chart i{display:block;min-height:7px;border-radius:5px 5px 2px 2px;background:linear-gradient(var(--root),#7f6333)}.week-chart b,.week-chart span{font-size:10px}.week-chart span{color:var(--muted)}.badge-list{display:grid;gap:9px}.badge-list>div{display:grid;grid-template-columns:auto 1fr;gap:2px 10px;padding:10px;border-bottom:1px solid var(--line)}.badge-list>div span{grid-row:1/3;color:var(--root)}.badge-list small{color:var(--muted)}

.game-gallery { display:grid; grid-template-columns:repeat(4,1fr); gap:12px; }
.game-card { position:relative; display:grid; gap:9px; min-height:230px; padding:20px; overflow:hidden; color:var(--text); text-align:right; border:1px solid var(--line); border-radius:16px; background:linear-gradient(145deg,var(--panel-2),var(--panel)); transition:.2s ease; }
.game-card:hover,.game-card.is-active{transform:translateY(-3px);border-color:rgba(216,173,89,.45);box-shadow:0 18px 45px rgba(0,0,0,.25)}.game-card i{font-size:30px;color:var(--root);font-style:normal}.game-card strong{font:700 21px Georgia,serif}.game-card small{color:var(--muted);line-height:1.6}.game-card b{margin-top:auto;color:var(--root);font-size:11px}.game-number{position:absolute;top:11px;left:13px;color:rgba(255,255,255,.14);font:700 30px Georgia,serif}
.game-console { margin-top:20px; padding:18px; border:1px solid var(--line-strong); border-radius:22px; box-shadow:var(--shadow); }.game-console-head,.game-settings,.game-hud,.game-actions{display:flex;align-items:center;flex-wrap:wrap;gap:12px}.game-console-head{justify-content:space-between}.game-console-head h3{margin:0;font:700 31px Georgia,serif}.game-settings label{min-width:135px}.game-hud{justify-content:space-around;margin:16px 0;padding:12px;border:1px solid var(--line);border-radius:12px;background:#100e0c}.game-hud span{color:var(--muted);font-size:11px}.game-hud strong{margin-inline-start:5px;color:var(--text);font-size:17px}.game-stage{position:relative;min-height:260px;overflow:hidden;border:1px solid var(--line);border-radius:16px;background:radial-gradient(circle at 50% 0,rgba(216,173,89,.09),transparent 50%),#0d0c0b}.game-empty,.game-prompt{position:absolute;z-index:3;inset:0;display:grid;place-content:center;gap:8px;text-align:center;pointer-events:none}.game-empty span,.game-prompt p{color:var(--muted)}.game-prompt h3{margin:0;font:700 clamp(27px,4vw,44px) Georgia,serif}.shooter-lane{position:absolute;inset:0}.falling-note{position:absolute;z-index:2;top:-80px;left:11%;display:grid;place-items:center;width:76px;height:76px;border:2px solid var(--root);border-radius:50%;color:var(--root-ink);background:var(--root);box-shadow:0 0 35px rgba(216,173,89,.3);animation:fallNote 5s linear forwards}.falling-note small{font-size:8px}.falling-note strong{font-size:22px}.hit-line{position:absolute;bottom:20px;right:0;left:0;padding-top:4px;color:var(--root);border-top:2px dashed rgba(216,173,89,.5);font-size:8px;text-align:center}@keyframes fallNote{to{top:calc(100% - 85px)}}.structure-row{display:flex;gap:7px;justify-content:center}.structure-row span{display:grid;place-items:center;width:38px;height:38px;border:1px solid var(--line-strong);border-radius:8px;background:var(--panel-2)}.game-feedback{min-height:58px;padding:10px 0}.game-feedback>div{display:flex;gap:12px;padding:12px 15px;border-radius:10px}.game-feedback .success{background:rgba(158,184,140,.12)}.game-feedback .failure{background:rgba(255,116,106,.1)}.game-feedback span{color:var(--muted)}.game-actions{margin-bottom:8px}.game-summary{display:grid;place-content:center;text-align:center;height:100%}.game-summary h3{margin:0;font:700 48px Georgia,serif;color:var(--root)}.game-summary>div{display:flex;gap:20px;margin:20px}.game-summary span{display:grid;color:var(--muted)}.game-summary b{color:var(--text);font-size:20px}.game-instrument{margin-top:12px}

@media(max-width:1100px){.game-gallery{grid-template-columns:repeat(2,1fr)}.dashboard-metrics{grid-template-columns:1fr 1fr}}
@media(max-width:700px){.onboarding-grid,.dashboard-grid,.dashboard-metrics{grid-template-columns:1fr}.dashboard-hero{grid-template-columns:1fr}.level-dial{width:110px}.game-gallery{grid-template-columns:1fr}.game-console-head{align-items:flex-start}.game-settings{width:100%}.game-settings label{flex:1}.game-hud{display:grid;grid-template-columns:repeat(3,1fr)}.game-prompt{padding:15px}.falling-note{left:5%}}

.mic-monitor{display:grid;grid-template-columns:auto 1fr 130px;gap:14px;align-items:center;margin:10px 0 16px;padding:14px 16px;border:1px solid rgba(158,184,140,.32);border-radius:12px;background:rgba(158,184,140,.08)}.mic-monitor>div{display:grid}.mic-monitor small{color:var(--muted)}.mic-pulse{width:14px;height:14px;border-radius:50%;background:var(--focus);box-shadow:0 0 0 0 rgba(158,184,140,.45);animation:micPulse 1.4s infinite}@keyframes micPulse{70%{box-shadow:0 0 0 12px transparent}}.tuner-meter{position:relative;height:7px;border-radius:9px;background:linear-gradient(90deg,var(--danger),var(--root),var(--focus),var(--root),var(--danger))}.tuner-meter::after{content:'';position:absolute;top:-4px;bottom:-4px;left:50%;width:2px;background:#fff}.tuner-meter i{position:absolute;z-index:2;top:-5px;left:calc(50% - 4px);width:8px;height:17px;border-radius:4px;background:#fff;transition:transform .1s linear}
.lesson-theory{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin:22px 0}.lesson-theory article{padding:16px;border:1px solid var(--line);border-radius:12px;background:var(--panel-2)}.lesson-theory small{display:block;margin-bottom:8px;color:var(--root);font-weight:900}.lesson-theory strong{font-size:16px;line-height:1.65}.lesson-theory p{margin:0;color:var(--muted)}.lesson-theory ol{margin:0;padding-inline-start:20px}.lesson-theory li+li{margin-top:6px}.lesson-theory .theory-trap{border-color:rgba(216,173,89,.28);background:rgba(216,173,89,.06)}
@media(max-width:700px){.mic-monitor{grid-template-columns:auto 1fr}.tuner-meter{grid-column:1/-1;width:100%}.lesson-theory{grid-template-columns:1fr}}

.theory-overview{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:16px}.theory-level-card{display:grid;gap:7px;min-height:150px;padding:17px;color:var(--text);text-align:right;border:1px solid var(--line);border-radius:14px;background:var(--panel)}.theory-level-card:hover,.theory-level-card.is-active{border-color:rgba(216,173,89,.48);background:linear-gradient(145deg,rgba(216,173,89,.09),var(--panel))}.theory-level-card small,.theory-level-card span{color:var(--muted)}.theory-level-card strong{font:700 20px Georgia,serif}.theory-level-card b{font-size:10px;color:var(--root)}
.theory-academy-layout{display:grid;grid-template-columns:280px minmax(0,1fr);gap:14px}.theory-syllabus{max-height:calc(100vh - 130px);overflow:auto;padding:10px;border:1px solid var(--line);border-radius:16px;background:var(--panel)}.theory-syllabus section+section{margin-top:18px}.theory-syllabus h4{margin:7px 8px;color:var(--root);font-size:11px}.theory-syllabus-item{display:grid;grid-template-columns:30px 1fr;gap:8px;align-items:center;width:100%;padding:9px;color:var(--muted);text-align:right;border:0;border-radius:9px;background:transparent}.theory-syllabus-item:hover,.theory-syllabus-item.is-active{color:var(--text);background:var(--panel-3)}.theory-syllabus-item>span{display:grid;place-items:center;width:27px;height:27px;border:1px solid var(--line);border-radius:7px;font-size:10px}.theory-syllabus-item.is-complete>span{color:var(--root-ink);background:var(--root)}.theory-syllabus-item div{display:grid}.theory-syllabus-item small{font-size:9px;color:var(--muted-2)}
.theory-lesson{padding:clamp(18px,3vw,32px);border:1px solid var(--line);border-radius:20px;background:var(--panel);box-shadow:var(--shadow)}.theory-lesson-head{display:grid;grid-template-columns:1fr auto;gap:20px;align-items:start}.theory-lesson-head h3{margin:0;font:700 clamp(32px,4vw,52px)/1.05 Georgia,serif}.theory-lesson-head p:not(.kicker){color:var(--muted)}.theory-progress-ring{display:grid;place-items:center;width:92px;aspect-ratio:1;border:5px double var(--line-strong);border-radius:50%;background:var(--panel-2)}.theory-progress-ring strong{font:700 27px Georgia,serif;color:var(--root)}.theory-progress-ring small{font-size:9px;color:var(--muted)}.theory-prose{display:grid;gap:9px;margin:25px 0}.theory-prose section{display:grid;grid-template-columns:36px 1fr;gap:12px;padding:15px;border-right:2px solid var(--line-strong);background:rgba(255,255,255,.012)}.theory-prose span{color:var(--root);font:700 15px Georgia,serif}.theory-prose p{margin:0;line-height:1.75}.theory-application{display:grid;grid-template-columns:1fr 1fr;gap:9px}.theory-application section{padding:16px;border:1px solid var(--line);border-radius:12px;background:var(--panel-2)}.theory-application small{display:block;margin-bottom:7px;color:var(--root);font-weight:900}.theory-application p{margin:0;color:var(--muted)}.theory-application ol{margin:0;padding-inline-start:20px}.theory-application .theory-warning{grid-column:1/-1;border-color:rgba(255,116,106,.22)}.theory-controls{display:flex;align-items:end;flex-wrap:wrap;gap:10px;margin:18px 0;padding:12px;border:1px solid var(--line);border-radius:12px}.theory-controls label{display:grid;gap:5px;min-width:150px;color:var(--muted);font-size:11px}.theory-instruments{margin-top:0}.theory-quiz{margin-top:18px}
@media(max-width:1100px){.theory-overview{grid-template-columns:1fr 1fr}.theory-academy-layout{grid-template-columns:1fr}.theory-syllabus{display:flex;max-height:none;overflow-x:auto}.theory-syllabus section{min-width:250px}.theory-syllabus section+section{margin-top:0}}
@media(max-width:650px){.theory-overview,.theory-application{grid-template-columns:1fr}.theory-application .theory-warning{grid-column:auto}.theory-lesson-head{grid-template-columns:1fr}.theory-progress-ring{width:76px}.theory-controls>*{width:100%}}
.lesson-discovery{margin:18px 0;padding:20px;border:1px solid rgba(216,173,89,.3);border-radius:16px;background:linear-gradient(145deg,rgba(216,173,89,.08),var(--panel-2))}.discovery-head{display:flex;justify-content:space-between;gap:18px}.discovery-head h4{margin:4px 0;font:700 29px Georgia,serif}.discovery-head p{margin:0;color:var(--muted)}.discovery-head>span{color:var(--root);font-size:11px}.discovery-actions{display:flex;gap:9px;flex-wrap:wrap;margin:18px 0}.transfer-task,.unit-project{margin-top:14px;padding:16px;border:1px solid var(--line);border-radius:12px;background:rgba(0,0,0,.12)}.transfer-task small,.unit-project small{display:block;margin-bottom:7px;color:var(--root);font-weight:900}.transfer-task ol{padding-inline-start:22px}.transfer-task label{display:flex;gap:8px;align-items:center;margin-top:12px}.unit-project{display:grid;gap:7px;border-color:rgba(158,184,140,.35)}.unit-project strong{font-size:18px}.unit-project p{margin:0;color:var(--muted)}.tap-lab{display:grid;grid-template-columns:180px 1fr;gap:12px;align-items:center;margin:12px 0}.tap-pad{min-height:72px;padding:14px;color:var(--root-ink);font-weight:900;border:0;border-radius:12px;background:var(--root);box-shadow:0 5px 0 #6d5228}.tap-pad:active{transform:translateY(4px);box-shadow:0 1px 0 #6d5228}.tap-lab p{color:var(--muted)}.theory-syllabus-item.is-locked{opacity:.58}.novice-hidden-level{display:none}.beginner-mode .game-card:nth-child(n+5){display:none}@media(max-width:620px){.discovery-head{display:grid}.tap-lab{grid-template-columns:1fr}.discovery-actions>*{width:100%}}
.pedagogy-brief{display:grid;grid-template-columns:1.1fr 1.4fr 1fr;gap:9px;margin:18px 0}.pedagogy-brief section,.mastery-check,.diagnostic-question,.diagnostic-result,.glossary-card{padding:17px;border:1px solid var(--line);border-radius:14px;background:var(--panel-2)}.pedagogy-brief small,.mastery-check .kicker,.diagnostic-question>small,.glossary-card>small{color:var(--root);font-weight:800}.pedagogy-brief p{margin:7px 0;color:var(--muted)}.pedagogy-brief ul{margin:7px 0;padding-inline-start:19px}.prereq-blocked{border-color:rgba(255,116,106,.35)!important}.mastery-check{display:grid;gap:10px;margin-top:12px}.mastery-check h4{margin:0}.mastery-check label{display:flex;gap:9px;align-items:center;padding:10px;border:1px solid var(--line);border-radius:9px}.mastery-check input{width:20px;height:20px}.mastery-check p:last-child{color:var(--muted);font-size:12px}.diagnostic-shell{max-width:850px;margin:auto}.diagnostic-progress{height:8px;margin:0 0 14px;border-radius:10px;background:var(--panel-3);overflow:hidden}.diagnostic-progress i{display:block;height:100%;background:var(--root)}.diagnostic-question h3,.diagnostic-result h3{font:700 clamp(26px,4vw,42px) Georgia,serif}.diagnostic-options{display:grid;grid-template-columns:1fr 1fr;gap:9px;margin-top:18px}.diagnostic-options button{min-height:54px;padding:12px;color:var(--text);border:1px solid var(--line);border-radius:10px;background:var(--panel)}.diagnostic-options button:hover{border-color:var(--root)}.saved-note{color:var(--muted);text-align:center}.mastery-radar{display:grid;gap:9px;margin:22px 0}.mastery-radar>div{display:grid;grid-template-columns:130px 1fr 45px;gap:10px;align-items:center}.mastery-radar i{height:9px;border-radius:10px;background:var(--panel-3);overflow:hidden}.mastery-radar b{display:block;height:100%;background:linear-gradient(90deg,var(--wood),var(--root))}.glossary-search{display:grid;gap:7px;max-width:520px;margin-bottom:16px}.glossary-search input{padding:14px;border:1px solid var(--line);border-radius:10px;color:var(--text);background:var(--panel)}.glossary-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.glossary-card h3{margin:7px 0;font:700 25px Georgia,serif}.glossary-card p{color:var(--muted)}.glossary-card details{margin:12px 0}.glossary-card>div{display:flex;gap:7px;flex-wrap:wrap}.rhythm-lab{max-width:920px;margin:auto}.rhythm-console{display:grid;gap:18px;padding:clamp(18px,4vw,36px);border:1px solid var(--line);border-radius:20px;background:var(--panel);box-shadow:var(--shadow)}.rhythm-settings{display:flex;gap:12px;align-items:end;flex-wrap:wrap}.rhythm-settings label{display:grid;gap:6px;min-width:180px;color:var(--muted);font-size:11px}.rhythm-score{display:grid;gap:12px;padding:24px;text-align:center;border:1px solid var(--line);border-radius:14px;background:#0e0c0a}.rhythm-score small{color:var(--muted)}.rhythm-score strong{direction:ltr;font:700 clamp(28px,6vw,54px) Georgia,serif;letter-spacing:.12em;color:var(--root)}#rhythmCountdown{font-size:20px}.rhythm-main-tap{min-height:110px;font-size:22px}.rhythm-results{display:grid;gap:7px;min-height:70px;padding:16px;border:1px solid var(--line);border-radius:12px;color:var(--muted)}.rhythm-results strong{color:var(--root);font-size:26px}@media(max-width:900px){.pedagogy-brief,.glossary-grid{grid-template-columns:1fr 1fr}}@media(max-width:620px){.pedagogy-brief,.glossary-grid,.diagnostic-options{grid-template-columns:1fr}.mastery-radar>div{grid-template-columns:100px 1fr 38px}.rhythm-settings{display:grid}.rhythm-settings>*{width:100%}}
/* High-contrast yellow/black pass. Keeps the original app structure and games intact. */
:root,
html[data-theme="dark"] {
  color-scheme: dark;
  --bg: #050505;
  --bg-elevated: #090909;
  --panel: #101010;
  --panel-2: #161616;
  --panel-3: #202020;
  --text: #fff8d7;
  --muted: #b8b29b;
  --muted-2: #817b68;
  --line: rgba(255, 213, 0, .14);
  --line-strong: rgba(255, 213, 0, .28);
  --root: #ffd500;
  --root-ink: #070704;
  --scale: #00a7ff;
  --chord: #ff4fc3;
  --focus: #38ef91;
  --danger: #ff4f45;
  --outside: #4e4a36;
  --wood: #b27b1c;
  --shadow: 0 24px 70px rgba(0, 0, 0, .52);
}

body {
  background:
    linear-gradient(135deg, rgba(255, 213, 0, .06), transparent 22rem),
    linear-gradient(315deg, rgba(0, 167, 255, .045), transparent 26rem),
    var(--bg);
}

.welcome {
  background:
    linear-gradient(135deg, rgba(255, 213, 0, .16), transparent 28%),
    linear-gradient(315deg, rgba(0, 167, 255, .10), transparent 34%),
    #050505;
}

.welcome-glow { display: none; }

.brand-mark,
.button.primary,
.skip-link,
.tap-pad,
.falling-note,
.demo-guitar button.is-active strong,
.theory-syllabus-item.is-complete > span {
  background: linear-gradient(180deg, #ffe766, var(--root));
  box-shadow: 0 0 0 1px rgba(255,255,255,.08) inset, 0 12px 34px rgba(255,213,0,.16);
}

.button,
.icon-button,
select,
input[type="number"],
.toggle-label,
.control-card,
.instrument-card,
.info-card,
.data-card,
.explanation-card,
.analysis-card,
.formula-card,
.chord-builder-card,
.recognizer-result,
.exercise-card,
.lesson-content,
.settings-card,
.danger-zone,
.theory-lesson,
.game-console,
.lesson-discovery {
  border-color: var(--line-strong);
}

.nav-item.is-active,
.theory-syllabus-item.is-active,
.theory-level-card.is-active,
.game-card.is-active {
  background: linear-gradient(90deg, rgba(255,213,0,.14), rgba(255,213,0,.035));
}

.screen-heading h2,
.welcome h1,
.theory-lesson-head h3,
.game-console-head h3 {
  letter-spacing: 0;
}

.game-card {
  background:
    linear-gradient(145deg, rgba(255,213,0,.08), transparent 40%),
    linear-gradient(145deg, var(--panel-2), var(--panel));
}

.game-card:hover,
.game-card.is-active,
.theory-level-card:hover,
.theory-level-card.is-active,
.option-button:hover,
.diagnostic-options button:hover {
  border-color: rgba(255, 213, 0, .66);
  box-shadow: 0 18px 48px rgba(0,0,0,.36), 0 0 0 1px rgba(255,213,0,.10) inset;
}

.game-stage,
.rhythm-score {
  background:
    linear-gradient(180deg, rgba(255,213,0,.08), transparent 42%),
    #080808;
}

.theory-prose section {
  border-right-color: rgba(255,213,0,.42);
  background: rgba(255,213,0,.035);
}

.theory-application section,
.pedagogy-brief section,
.mastery-check,
.diagnostic-question,
.diagnostic-result,
.glossary-card {
  background: linear-gradient(180deg, rgba(255,255,255,.025), rgba(255,213,0,.018));
}

.option-button.is-correct {
  color: #06140b;
  background: linear-gradient(180deg, #85ffb6, #38ef91);
  border-color: #38ef91;
}

.option-button.is-wrong {
  background: linear-gradient(180deg, #ff6e64, #b92f28);
}

html[data-theme="light"] {
  --root: #d29d00;
  --root-ink: #111;
  --scale: #006ed1;
  --chord: #b51981;
  --focus: #15824f;
}

.source-panel {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  margin-top: 18px;
  padding: 18px;
  border: 1px solid var(--line-strong);
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(255,213,0,.08), rgba(0,167,255,.035)), var(--panel);
}

.source-panel h3 {
  margin: 4px 0 5px;
  font: 700 24px Georgia, serif;
}

.source-panel p:last-child {
  margin: 0;
  color: var(--muted);
}

@media(max-width:620px) {
  .source-panel {
    display: grid;
  }
}

.lesson-outcome {
  border-color: rgba(255,213,0,.48) !important;
  background: linear-gradient(135deg, rgba(255,213,0,.11), rgba(255,255,255,.02)) !important;
}

.lesson-outcome p {
  color: var(--text) !important;
  font-weight: 800;
}

.discovery-procedure,
.checkpoint-panel {
  margin: 14px 0;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: rgba(255,255,255,.025);
}

.discovery-procedure small,
.checkpoint-panel small {
  color: var(--root);
  font-weight: 900;
}

.discovery-procedure ol,
.checkpoint-panel ol {
  margin: 8px 0 0;
  padding-inline-start: 22px;
}

.checkpoint-head {
  display: flex;
  justify-content: space-between;
  gap: 14px;
}

.checkpoint-head h4 {
  margin: 4px 0;
  font: 700 24px Georgia, serif;
}

.checkpoint-head p,
.checkpoint-feedback,
.checkpoint-project {
  color: var(--muted);
}

.checkpoint-head > span {
  align-self: start;
  padding: 5px 9px;
  color: var(--root);
  border: 1px solid var(--line-strong);
  border-radius: 8px;
  font-size: 10px;
  font-weight: 900;
}

.checkpoint-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

.syllabus-goal {
  margin: 10px 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 11px;
  background: rgba(255,213,0,.035);
}

.syllabus-goal p,
.syllabus-goal small,
.syllabus-goal b {
  display: block;
  margin: 6px 0 0;
  color: var(--muted);
}

.syllabus-goal b {
  color: var(--root);
}

.syllabus-full-map {
  margin-top: 10px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 11px;
}

.syllabus-full-map summary {
  color: var(--root);
  cursor: pointer;
  font-size: 12px;
  font-weight: 900;
}

@media(max-width:620px) {
  .checkpoint-head {
    display: grid;
  }
}