@import "https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@400;500;600&display=swap";:root{--bg:#f4f5f7;--bg-accent:#eceff3;--panel-bg:#fff;--surface:#ffffffb3;--surface-strong:#ffffffe6;--ink:#1b1f24;--ink-muted:#5a6572;--accent:#2f6fed;--accent-strong:#255bcd;--border:#1b1f241f;--shadow:0 1px 2px #1b1f2414;--sans:"Space Grotesk", sans-serif;--heading:"Space Grotesk", sans-serif;font:18px/1.6 var(--sans);letter-spacing:.15px;color:var(--ink);background:var(--bg);font-synthesis:none;text-rendering:optimizelegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (width<=960px){:root{font-size:16px}}*{box-sizing:border-box}body{background:linear-gradient(180deg, var(--bg), var(--bg-accent));min-height:100svh;margin:0}#root{width:min(1100px,100%);margin:0 auto;padding:32px 20px 64px}h1,h2{font-family:var(--heading);letter-spacing:-.5px;margin:0;font-weight:600}h1{font-size:clamp(2.2rem,3vw,3.4rem);line-height:1.1}h2{font-size:clamp(1.4rem,2.1vw,2rem)}p{margin:0}button{font:inherit}:root[data-theme=dark]{--bg:#1b1f24;--bg-accent:#14181d;--panel-bg:#20252b;--surface:#20252be6;--surface-strong:#20252bfa;--ink:#f8fafc;--ink-muted:#c9d1db;--accent:#7aa2ff;--accent-strong:#5f87f5;--border:#f8fafc29;--shadow:0 1px 2px #0006}.app{flex-direction:column;gap:28px;display:flex}.topbar{background:var(--panel-bg);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:24px;padding:32px clamp(20px,3vw,36px)}.topbar-inner{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:20px;display:flex}.eyebrow{text-transform:uppercase;letter-spacing:2px;color:var(--ink-muted);margin-bottom:10px;font-size:.78rem}.subtitle{color:var(--ink-muted);max-width:620px;margin-top:12px}.panel{background:var(--panel-bg);border:1px solid var(--border);box-shadow:var(--shadow);border-radius:24px;padding:clamp(20px,3vw,36px)}.stack{flex-direction:column;gap:28px;display:flex}.choice{flex-direction:column;gap:16px;display:flex}.muted{color:var(--ink-muted)}.toggle-row{flex-wrap:wrap;gap:12px;display:flex}.toggle{border:1px solid var(--border);background:var(--surface);color:var(--ink);border-radius:999px;padding:12px 22px;font-weight:600;transition:transform .2s,border-color .2s}.toggle.active{border-color:var(--accent);transform:translateY(-1px);box-shadow:0 4px 10px #2f6fed2e}.level-grid{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:14px;display:grid}.level-card{border:1px solid var(--border);background:var(--surface);color:var(--ink);text-align:left;border-radius:16px;flex-direction:column;align-items:flex-start;gap:6px;padding:16px;transition:border-color .2s,transform .2s;display:flex}.level-card.active{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 4px 10px #2f6fed2e}.level-title{font-weight:600}.level-hint{color:var(--ink-muted);font-size:.9rem}.primary{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:999px;align-self:flex-start;padding:14px 28px;font-weight:600;box-shadow:0 8px 16px #2f6fed4d}.ghost{border:1px solid var(--border);color:var(--ink);cursor:pointer;background:0 0;border-radius:999px;padding:10px 18px;font-weight:600}.ghost.active{border-color:var(--accent);color:var(--accent-strong)}.drill{flex-direction:column;gap:22px;display:flex}.drill-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;display:flex}.drill-actions{flex-wrap:wrap;gap:10px;display:flex}.note-stage{background:linear-gradient(135deg, var(--surface-strong), var(--bg-accent));border:1px solid #2f6fed2e;border-radius:22px;place-items:center;min-height:240px;padding:18px;transition:box-shadow .2s,border-color .2s;display:grid}.note-stage.correct{border-color:#2a995e99;box-shadow:0 0 0 2px #2a995e33}.note-stage.wrong{border-color:#ba3a2e99;box-shadow:0 0 0 2px #ba3a2e2e}.staff{width:min(100%,560px);height:auto}.staff-lines line{stroke:color-mix(in srgb, var(--ink) 70%, transparent);stroke-width:2px;stroke-linecap:round}.clef-label{font-family:var(--heading);fill:color-mix(in srgb, var(--ink) 70%, transparent);font-size:18px}.ledger{stroke:color-mix(in srgb, var(--ink) 65%, transparent);stroke-width:2px;stroke-linecap:round}.note ellipse{fill:var(--ink)}.hud{background:var(--surface);border:1px solid var(--border);border-radius:16px;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:12px;padding:14px 16px;display:grid}.feedback{text-align:center;color:var(--ink-muted);min-height:24px;font-weight:500}.feedback.correct{color:#2a995e}.feedback.wrong{color:#ba3a2e}.hud-label{text-transform:uppercase;letter-spacing:1px;color:var(--ink-muted);font-size:.8rem}.hud-value{font-size:1.1rem;font-weight:600}.answer-row{grid-template-columns:repeat(7,minmax(0,1fr));gap:10px;display:grid}.answer{border:1px solid var(--border);background:var(--surface-strong);color:var(--ink);cursor:pointer;border-radius:14px;padding:14px 0;font-weight:600;transition:transform .2s}.answer:disabled{opacity:.6;cursor:not-allowed}.answer:hover:not(:disabled){transform:translateY(-1px)}.hint{text-align:center;color:var(--ink-muted)}.summary{flex-direction:column;gap:22px;display:flex}.summary-grid{grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px;display:grid}.summary-card{background:var(--surface-strong);border:1px solid var(--border);border-radius:16px;flex-direction:column;gap:6px;padding:16px;display:flex}.summary-value{letter-spacing:-.3px;font-size:1.5rem;font-weight:600}.summary-actions{flex-wrap:wrap;gap:12px;display:flex}@media (width<=720px){.primary{justify-content:center;width:100%}.answer-row{grid-template-columns:repeat(4,minmax(0,1fr))}}