:root{--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark;--bg:#12100d;--card:#1c1814;--text:#ece7df;--muted:#a8a29e;--gold:#f0b429;--border:#2e2822}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);margin:0;font-family:system-ui,-apple-system,Segoe UI,sans-serif;line-height:1.5}.page{max-width:960px;margin:0 auto;padding:24px 16px 48px}.hero h1{letter-spacing:-.01em;margin:0 0 4px;font-size:clamp(1.6rem,4vw,2.4rem)}.subtitle{color:var(--muted);margin:0 0 20px}.board-card{background:var(--card);border:1px solid var(--border);border-radius:14px;padding:20px 12px 12px;overflow-x:auto}.board-card svg{min-width:560px}.legend{color:var(--muted);flex-wrap:wrap;gap:8px 20px;padding:14px 8px 6px;font-size:.85rem;display:flex}.legend-item{align-items:center;gap:8px;display:inline-flex}.swatch{background:#111827;border-radius:50%;width:18px;height:18px;display:inline-block}.swatch-root{border:3px solid #fff}.swatch-shared{border:3px solid var(--gold)}.swatch-roman{width:auto;min-width:22px;height:22px;color:var(--text);background:0 0;border-radius:6px;justify-content:center;align-items:center;padding:0 4px;font-size:.8rem;font-weight:700;display:inline-flex}.chords{grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:12px;margin:20px 0;display:grid}.chord-card{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:14px 16px}.chord-roman{color:var(--gold);font-size:1.6rem;font-weight:800}.chord-card h2{margin:2px 0 4px;font-size:1.05rem}.chord-root{color:var(--muted);font-weight:400}.chord-tones{color:var(--muted);text-transform:capitalize;margin:0;font-size:.9rem}.pipeline{background:var(--card);border:1px solid var(--border);border-radius:12px;padding:16px 20px}.pipeline h2{margin:0 0 8px;font-size:1.1rem}.pipeline ol{color:var(--muted);margin:0;padding-left:20px;font-size:.92rem}.pipeline li{margin-bottom:6px}.pipeline code{color:var(--text);background:#2a241e;border-radius:5px;padding:1px 6px;font-size:.85em}footer{text-align:center;color:var(--muted);margin-top:28px;font-size:.85rem}footer a{color:var(--gold)}.tabbar{z-index:20;border-bottom:1px solid var(--border);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);background:#12100df5;gap:4px;padding:10px 12px;display:flex;position:sticky;top:0;overflow-x:auto}.tabbar .brand{color:var(--gold);white-space:nowrap;padding:8px 10px;font-size:.95rem;font-weight:800}.tabbar button.tab{color:var(--muted);cursor:pointer;white-space:nowrap;background:0 0;border:1px solid #0000;border-radius:10px;padding:8px 12px;font-size:.9rem}.tabbar button.tab:hover{color:var(--text)}.tabbar button.tab-active{color:var(--gold);border-color:var(--border);background:#221c14}.card{background:var(--card);border:1px solid var(--border);border-radius:14px;margin:16px 0;padding:18px}.card-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:6px;display:flex}.card-head h2{margin:0;font-size:1.15rem}.chip-row{flex-wrap:wrap;gap:6px;display:flex}.chip{border:1px solid var(--border);color:var(--text);cursor:pointer;background:#14110d;border-radius:999px;padding:7px 14px;font-size:.88rem}.chip:hover{border-color:#4a4033}.chip-active{border-color:var(--gold);color:var(--gold);background:#f0b4291a}.segmented{border:1px solid var(--border);background:#14110d;border-radius:10px;gap:2px;padding:3px;display:inline-flex}.seg{color:var(--muted);cursor:pointer;background:0 0;border:0;border-radius:8px;padding:7px 14px;font-size:.9rem}.seg-active{color:var(--text);background:#2b241c}.keypicker{flex-wrap:wrap;gap:6px;display:flex}.control-row{flex-direction:column;gap:8px;margin:14px 0;display:flex}.control-label{color:var(--muted);text-transform:uppercase;letter-spacing:.07em;font-size:.75rem}.btn-primary{background:var(--gold);color:#1a1408;cursor:pointer;white-space:nowrap;border:0;border-radius:10px;padding:10px 18px;font-size:.95rem;font-weight:700}.btn-primary:disabled{opacity:.5;cursor:default}.btn-ghost{color:var(--text);border:1px solid var(--border);cursor:pointer;white-space:nowrap;background:0 0;border-radius:10px;padding:9px 16px;font-size:.9rem}.btn-ghost:disabled{opacity:.5;cursor:default}.stepper{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.step-label{color:var(--muted);font-size:.95rem}.step-label strong{color:var(--text)}.concept-nav{grid-template-columns:repeat(auto-fit,minmax(170px,1fr));gap:10px;margin:4px 0 8px;display:grid}.concept-card{text-align:left;background:var(--card);border:1px solid var(--border);cursor:pointer;color:var(--text);border-radius:12px;padding:14px;font-family:inherit}.concept-card.active{border-color:var(--gold)}.concept-card h3{margin:0 0 4px;font-size:1rem}.concept-card p{color:var(--muted);margin:0;font-size:.85rem}.explainer{color:var(--muted);max-width:70ch;margin:12px 2px;font-size:.95rem}.explainer strong{color:var(--text)}.slider-row{align-items:center;gap:12px;display:flex}.slider-row input[type=range]{accent-color:var(--gold);flex:1}.slider-val{text-align:right;font-variant-numeric:tabular-nums;min-width:64px;color:var(--text)}.tuner-wrap{flex-direction:column;align-items:center;gap:8px;padding:8px 0;display:flex}.tuner-note{margin:0;font-size:3rem;font-weight:800}.tuner-cents{color:var(--muted);font-variant-numeric:tabular-nums}.tuner-status{font-weight:700}.tuner-status.in-tune{color:#4ade80}.tuner-status.out{color:var(--gold)}.list-card{text-align:left;background:var(--card);border:1px solid var(--border);width:100%;color:var(--text);cursor:pointer;border-radius:12px;justify-content:space-between;align-items:center;gap:12px;margin:8px 0;padding:14px 16px;font-family:inherit;display:flex}.list-card:hover{border-color:#4a4033}.list-card h3{margin:0 0 2px;font-size:1rem}.list-card p{color:var(--muted);margin:0;font-size:.85rem}.score-big{color:var(--gold);margin:4px 0;font-size:2.6rem;font-weight:800}.feedback{color:var(--muted);margin:8px 0;padding-left:20px}.feedback li{margin-bottom:4px}.pitch-readout{font-variant-numeric:tabular-nums;min-height:2.2rem;font-size:1.4rem;font-weight:700}.stat-grid{grid-template-columns:repeat(auto-fit,minmax(130px,1fr));gap:10px;margin:12px 0;display:grid}.stat{border:1px solid var(--border);text-align:center;background:#14110d;border-radius:10px;padding:12px}.stat .v{color:var(--gold);font-size:1.5rem;font-weight:800}.stat .k{color:var(--muted);font-size:.8rem}.history-row{border-bottom:1px solid var(--border);justify-content:space-between;padding:8px 2px;font-size:.9rem;display:flex}.history-row .d{color:var(--muted)}@media (width<=640px){.page{padding:16px 10px 40px}.card{padding:14px 10px}.tabbar .brand{display:none}}.lesson-title{margin:14px 0 4px;font-size:1.5rem}.try-card{border-left:3px solid var(--gold);color:var(--muted)}.try-card strong{color:var(--text)}.explainer-inline{color:var(--muted)}