.deg2-chapter{--deg-alt:#b699eb;--deg-alt-soft:#b699eb26;--deg-alt-line:#b699eb66;padding:40px 32px 72px}@supports (color:lab(0% 0 0)){.deg2-chapter{--deg-alt:lab(68.2599% 23.7434 -37.7369);--deg-alt-soft:lab(68.2599% 23.7434 -37.7369/.15);--deg-alt-line:lab(68.2599% 23.7434 -37.7369/.4)}}.deg2-inner{max-width:1120px;margin:0 auto}.deg2-crumb{font-family:var(--font-mono);letter-spacing:.14em;text-transform:uppercase;color:var(--ink-subtle);align-items:center;gap:8px;margin-bottom:12px;font-size:11px;display:flex}.deg2-crumb .now{color:var(--ink)}.deg2-inner h1{letter-spacing:-.03em;margin:0;font-size:clamp(30px,4.5vw,48px);font-weight:400;line-height:1}.deg2-inner h1 em{font-family:var(--font-display);color:var(--accent);font-style:italic;font-weight:400}.deg2-lede{color:var(--ink-muted);max-width:62ch;margin:14px 0 0;font-size:15px;line-height:1.6}.deg2-grid{grid-template-columns:320px minmax(0,1fr);align-items:start;gap:28px;margin-top:28px;display:grid}.deg2-panel{background:var(--bg-elevated);border:1px solid var(--line);border-radius:16px;flex-direction:column;gap:18px;padding:22px;display:flex;position:sticky;top:96px}.deg2-ctl{flex-direction:column;gap:10px;display:flex}.deg2-chips{flex-wrap:wrap;gap:6px;display:flex}.deg2-chip{border:1px solid var(--line);color:var(--ink-muted);background:0 0;border-radius:999px;justify-content:center;align-items:center;gap:6px;min-width:46px;padding:8px 13px;font-size:13px;font-weight:500;transition:color .16s,border-color .16s,background .16s;display:inline-flex}.deg2-chip:hover{color:var(--ink)}.deg2-chip.on{border-color:var(--accent-amber-line,#f2ba534d);background:var(--accent-amber-soft,#f2ba5324);color:var(--accent)}@supports (color:lab(0% 0 0)){.deg2-chip.on{border-color:var(--accent-amber-line,lab(79.1911% 13.3651 58.6741/.3));background:var(--accent-amber-soft,lab(79.1911% 13.3651 58.6741/.14))}}.deg2-chip .g{font-family:var(--font-display);font-size:16px;font-style:italic}.deg2-seg{border:1px solid var(--line);background:var(--bg-sunken);border-radius:11px;gap:2px;width:fit-content;padding:4px;display:inline-flex}.deg2-seg button{color:var(--ink-muted);cursor:pointer;background:0 0;border:0;border-radius:7px;min-width:76px;padding:8px 16px;font-size:13px;font-weight:500}.deg2-seg button.on{background:var(--bg-elevated-2);color:var(--ink)}.deg2-btn-m{background:var(--accent);color:#161107;color:lab(5.28768% 1.3264 4.87425);cursor:pointer;border:0;border-radius:999px;justify-content:center;align-items:center;gap:8px;height:46px;padding:0 18px;font-size:14px;font-weight:600;display:inline-flex}.deg2-btn-g{height:42px;color:var(--ink);border:1px solid var(--line-strong);cursor:pointer;background:0 0;border-radius:999px;justify-content:center;align-items:center;gap:8px;padding:0 18px;font-size:13.5px;font-weight:500;display:inline-flex}.deg2-btn-g:hover{border-color:var(--accent-amber-line,#f2ba534d);color:var(--accent)}@supports (color:lab(0% 0 0)){.deg2-btn-g:hover{border-color:var(--accent-amber-line,lab(79.1911% 13.3651 58.6741/.3))}}.deg2-key-pill{font-family:var(--font-mono);color:var(--accent);border:1px solid var(--accent-amber-line,#f2ba534d);background:var(--accent-amber-soft,#f2ba5324);white-space:nowrap;border-radius:999px;width:fit-content;padding:4px 10px;font-size:12px}@supports (color:lab(0% 0 0)){.deg2-key-pill{border:1px solid var(--accent-amber-line,lab(79.1911% 13.3651 58.6741/.3));background:var(--accent-amber-soft,lab(79.1911% 13.3651 58.6741/.14))}}.deg2-panel-hint{color:var(--ink-subtle);margin:0;font-size:12px;line-height:1.55}.deg2-variant-note{color:var(--ink-subtle);margin:2px 0 0;font-size:12px;line-height:1.55}.deg2-staff-card{position:relative}.deg2-staff{background:var(--staff-bg,var(--bg-sunken));border:1px solid var(--staff-border);border-radius:14px;padding:10px 12px 34px;overflow:auto visible}.deg2-staff-layer{width:fit-content;min-width:100%;position:relative}.deg2-staff-plays{z-index:3;gap:6px;display:flex;position:absolute;top:14px;right:14px}.deg2-staff-play{background:var(--accent);color:#161107;color:lab(5.28768% 1.3264 4.87425);cursor:pointer;border:0;border-radius:999px;align-items:center;gap:8px;height:38px;padding:0 16px 0 6px;font-size:13px;font-weight:600;display:inline-flex}.deg2-staff-play.ghost{background:color-mix(in oklab, var(--bg) 72%, transparent);color:var(--ink);box-shadow:inset 0 0 0 1px var(--line-strong)}.deg2-staff-play.ghost .disc{background:var(--bg-elevated-2);color:var(--ink)}.deg2-staff-play .disc{width:26px;height:26px;color:var(--accent);background:#161107;background:lab(5.28768% 1.3264 4.87425);border-radius:50%;justify-content:center;align-items:center;font-size:10px;display:inline-flex}.deg2-tonic-ring{width:22px;height:22px;box-shadow:0 0 0 2px var(--staff-bg,var(--bg-sunken)), 0 0 0 3.5px var(--accent), 0 0 14px var(--accent-amber-line,#f2ba534d);pointer-events:none;border-radius:50%;position:absolute;transform:translate(-50%,-50%)}@supports (color:lab(0% 0 0)){.deg2-tonic-ring{box-shadow:0 0 0 2px var(--staff-bg,var(--bg-sunken)), 0 0 0 3.5px var(--accent), 0 0 14px var(--accent-amber-line,lab(79.1911% 13.3651 58.6741/.3))}}.deg2-note-glow{background:var(--accent-amber-soft,#f2ba5340);filter:blur(9px);pointer-events:none;border-radius:50%;width:34px;height:34px;position:absolute;transform:translate(-50%,-50%)}@supports (color:lab(0% 0 0)){.deg2-note-glow{background:var(--accent-amber-soft,lab(79.1911% 13.3651 58.6741/.25))}}.deg2-note-hit{cursor:pointer;background:0 0;border:0;border-radius:8px;justify-content:center;align-items:flex-end;width:38px;padding:0 0 6px;display:flex;position:absolute;top:0;bottom:0;transform:translate(-50%)}.deg2-note-hit:hover{background:var(--staff-hover)}.deg2-note-hit .rn{font-family:var(--font-display);color:var(--ink-muted);font-size:17px;font-style:italic;line-height:1;transition:color .2s}.deg2-note-hit.stable .rn{color:var(--ok)}.deg2-note-hit.unstable .rn{color:var(--warn)}.deg2-note-hit.altered .rn{color:var(--deg-alt)}.deg2-note-hit.tonic .rn{color:var(--accent);font-size:19px}.deg2-note-hit.play-on .rn{text-shadow:0 0 12px}html[data-staff-theme=light] .deg2-staff.staff-surface{--deg-alt:#724aab;--deg-alt-soft:#724aab24;--deg-alt-line:#724aab66}@supports (color:lab(0% 0 0)){html[data-staff-theme=light] .deg2-staff.staff-surface{--deg-alt:lab(39.6801% 33.0382 -46.413);--deg-alt-soft:lab(39.6801% 33.0382 -46.413/.14);--deg-alt-line:lab(39.6801% 33.0382 -46.413/.4)}}html[data-staff-theme=light] .deg2-staff.staff-surface .deg2-note-glow{background:color-mix(in oklab, var(--accent) 24%, transparent)}.deg2-kb-card{background:var(--bg-elevated);border:1px solid var(--line);border-radius:14px;margin-top:22px;padding:20px}.deg2-kb-head{flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:14px;margin-bottom:14px;display:flex}.deg2-kb-head h3{margin:0;font-size:15px;font-weight:500}.deg2-kb-head h3 em{font-family:var(--font-display);color:var(--accent);font-style:italic;font-weight:400}.deg2-legend{color:var(--ink-subtle);flex-wrap:wrap;gap:14px;font-size:11.5px;display:flex}.deg2-legend i{vertical-align:-1px;border-radius:50%;width:9px;height:9px;margin-right:5px;display:inline-block}.deg2-legend .lt i{background:var(--accent)}.deg2-legend .ls i{background:var(--ok)}.deg2-legend .lu i{background:var(--warn)}.deg2-ear{background:linear-gradient(135deg, var(--accent-amber-soft,#f2ba5324), transparent);border:1px solid var(--accent-amber-line,#f2ba534d);border-radius:16px;flex-direction:column;gap:16px;margin-top:22px;padding:24px;display:flex}@supports (color:lab(0% 0 0)){.deg2-ear{background:linear-gradient(135deg, var(--accent-amber-soft,lab(79.1911% 13.3651 58.6741/.14)), transparent);border:1px solid var(--accent-amber-line,lab(79.1911% 13.3651 58.6741/.3))}}.deg2-ear-head{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;display:flex}.deg2-ear-head h3{letter-spacing:-.01em;margin:0;font-size:18px;font-weight:500}.deg2-ear-head h3 em{font-family:var(--font-display);color:var(--accent);font-style:italic;font-weight:400}.deg2-ear-play{background:var(--accent);color:#161107;color:lab(5.28768% 1.3264 4.87425);cursor:pointer;border:0;border-radius:999px;align-items:center;gap:10px;height:48px;padding:0 22px 0 10px;font-size:15px;font-weight:600;display:inline-flex}.deg2-ear-play .disc{width:32px;height:32px;color:var(--accent);background:#161107;background:lab(5.28768% 1.3264 4.87425);border-radius:50%;justify-content:center;align-items:center;font-size:12px;display:inline-flex}.deg2-ear-opts{grid-template-columns:repeat(var(--n,7), minmax(0, 1fr));gap:8px;display:grid}.deg2-ear-opt{border:1px solid var(--line);background:var(--bg-elevated);color:var(--ink);font-family:var(--font-display);cursor:pointer;border-radius:10px;padding:14px 6px;font-size:22px;font-style:italic}.deg2-ear-opt:hover{border-color:var(--accent-amber-line,#f2ba534d)}@supports (color:lab(0% 0 0)){.deg2-ear-opt:hover{border-color:var(--accent-amber-line,lab(79.1911% 13.3651 58.6741/.3))}}.deg2-ear-opt.correct{background:var(--ok-soft,#6bd27229);color:var(--ok);border-color:#0000}@supports (color:lab(0% 0 0)){.deg2-ear-opt.correct{background:var(--ok-soft,lab(76.4902% -46.2649 38.1455/.16))}}.deg2-ear-opt.wrong{background:var(--bad-soft,#ff535229);color:var(--bad);border-color:#0000}@supports (color:lab(0% 0 0)){.deg2-ear-opt.wrong{background:var(--bad-soft,lab(60.719% 67.9023 41.2136/.16))}}.deg2-ear-meta{color:var(--ink-muted);font-size:12px;font-family:var(--font-mono);flex-wrap:wrap;gap:18px;display:flex}.deg2-ear-meta b{color:var(--ink)}.deg2-ear-limit{color:var(--warn,#c9a15a);margin:10px 0 0;font-size:12.5px;line-height:1.5}.deg2-func{background:var(--bg-elevated);border:1px solid var(--line);border-radius:14px;flex-direction:column;gap:12px;margin-top:22px;padding:22px;display:flex}.deg2-func h3{margin:0;font-size:15px;font-weight:500}.deg2-func p{color:var(--ink-muted);margin:0;font-size:13px;line-height:1.6}.deg2-flow{flex-wrap:wrap;align-items:center;gap:8px;margin-top:4px;display:flex}.deg2-node{font-family:var(--font-display);cursor:pointer;background:0 0;border:1px solid #0000;border-radius:10px;padding:8px 14px;font-size:18px;font-style:italic;transition:transform .14s}.deg2-node:hover{transform:translateY(-2px)}.deg2-node.t{background:var(--ok-soft,#6bd27229);color:var(--ok);border-color:var(--ok-line,#6bd2724d)}@supports (color:lab(0% 0 0)){.deg2-node.t{background:var(--ok-soft,lab(76.4902% -46.2649 38.1455/.16));border-color:var(--ok-line,lab(76.4902% -46.2649 38.1455/.3))}}.deg2-node.d{background:var(--warn-soft,#e7bf4a29);color:var(--warn);border-color:var(--warn-line,#e7bf4a4d)}@supports (color:lab(0% 0 0)){.deg2-node.d{background:var(--warn-soft,lab(79.4873% 5.75694 62.2761/.16));border-color:var(--warn-line,lab(79.4873% 5.75694 62.2761/.3))}}.deg2-arrow{color:var(--ink-subtle);font-size:14px}.deg2-flow .gap{width:18px}.deg2-chip.alt{font-family:var(--font-display);font-size:16px;font-style:italic}.deg2-chip.alt.on{border-color:var(--deg-alt-line);background:var(--deg-alt-soft);color:var(--deg-alt)}.deg2-chip:disabled{opacity:.35;cursor:default}.deg2-legend .la i{background:var(--deg-alt)}.deg2-plays{gap:8px;display:flex}.deg2-plays .deg2-btn-m{flex:1;padding:0 12px}.deg2-alt-flow{gap:10px 22px}.deg2-alt-pair{grid-template-columns:auto auto auto;align-items:center;gap:4px 8px;display:inline-grid}.deg2-node.alt{background:var(--deg-alt-soft);color:var(--deg-alt);border-color:var(--deg-alt-line)}.deg2-node:disabled{opacity:.35;cursor:default;transform:none}.deg2-node.static{cursor:default}.deg2-node.static:hover{transform:none}.deg2-alt-notes{font-family:var(--font-mono);color:var(--ink-subtle);grid-column:1/-1;font-size:11px}.deg2-func p.deg2-alt-foot{color:var(--ink-subtle);font-size:12px}.deg2-ear-actions{align-items:center;gap:8px;display:flex}.deg2-ear-tonic{border:1px solid var(--line-strong);height:48px;color:var(--ink);cursor:pointer;background:0 0;border-radius:999px;padding:0 18px;font-size:14px;font-weight:500}.deg2-ear-tonic:hover{border-color:var(--accent-amber-line,#f2ba534d);color:var(--accent)}@supports (color:lab(0% 0 0)){.deg2-ear-tonic:hover{border-color:var(--accent-amber-line,lab(79.1911% 13.3651 58.6741/.3))}}.deg2-ear-opt.alt{color:var(--deg-alt);border-style:dashed;font-size:20px}.deg2-ear-foot{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px 14px;display:flex}.deg2-ear-set-toggle{border:1px solid var(--line);max-width:100%;min-height:34px;color:var(--ink-muted);font-family:var(--font-mono);cursor:pointer;background:0 0;border-radius:999px;align-items:center;gap:8px;padding:0 12px;font-size:11.5px;display:inline-flex}.deg2-ear-set-toggle:hover,.deg2-ear-set-toggle[aria-expanded=true]{color:var(--ink);border-color:var(--line-strong)}.deg2-ear-set-toggle .sum{text-overflow:ellipsis;white-space:nowrap;min-width:0;overflow:hidden}.deg2-ear-set-toggle .ico{font-size:13px}.deg2-ear-settings{border:1px solid var(--line);background:var(--bg-sunken);border-radius:12px;gap:8px;padding:12px 14px;display:grid}.deg2-ear-row{grid-template-columns:92px minmax(0,1fr);align-items:center;gap:10px;display:grid}.deg2-ear-row .cap{color:var(--ink-subtle);font-size:12px}.deg2-ear-seg{flex-wrap:wrap;gap:4px;display:flex}.deg2-ear-seg button{border:1px solid var(--line);min-height:32px;color:var(--ink-muted);cursor:pointer;background:0 0;border-radius:8px;padding:0 12px;font-size:12.5px;font-weight:500;transition:color .16s,border-color .16s,background .16s}.deg2-ear-seg button:hover{color:var(--ink)}.deg2-ear-seg button.on{border-color:var(--accent-amber-line,#f2ba534d);background:var(--accent-amber-soft,#f2ba5324);color:var(--accent)}@supports (color:lab(0% 0 0)){.deg2-ear-seg button.on{border-color:var(--accent-amber-line,lab(79.1911% 13.3651 58.6741/.3));background:var(--accent-amber-soft,lab(79.1911% 13.3651 58.6741/.14))}}.deg2-mobile-bar{display:none}@media (max-width:900px){.deg2-chapter{padding:28px 18px 110px}.deg2-grid{grid-template-columns:minmax(0,1fr);gap:18px}.deg2-panel{position:static}.deg2-panel[data-mobile-open=false]{display:none}.deg2-panel[data-mobile-open=true]{z-index:90;overscroll-behavior:contain;border:1px solid var(--line);border-bottom:0;border-radius:18px 18px 0 0;max-height:min(85dvh,100dvh - 72px);margin:0;padding:0 18px;animation:.24s cubic-bezier(.2,.8,.2,1) deg2-sheet-up;position:fixed;inset:auto 0 0;overflow-y:auto;box-shadow:0 -24px 70px -10px #0009}@keyframes deg2-sheet-up{0%{transform:translateY(100%)}to{transform:translateY(0)}}.deg2-panel .deg2-btn-m,.deg2-panel .deg2-btn-g{display:none}.deg2-ear-opts{grid-template-columns:repeat(auto-fit,minmax(60px,1fr))}.deg2-ear-foot{flex-direction:column;align-items:stretch}.deg2-ear-set-toggle{justify-content:flex-start;width:100%;min-height:44px}.deg2-ear-set-toggle .chev{margin-left:auto}.deg2-ear-row{grid-template-columns:minmax(0,1fr);gap:6px}.deg2-ear-seg button{flex:1;min-height:44px}.deg2-ear-actions{width:100%}.deg2-ear-actions .deg2-ear-play{white-space:nowrap;flex:1;justify-content:center;padding:0 16px 0 8px}.deg2-ear-tonic{white-space:nowrap;height:48px;padding:0 14px}.deg2-staff-plays{top:10px;right:10px}.deg2-staff-play{height:40px;padding:0 12px 0 6px;font-size:12.5px}.deg2-mobile-bar .deg2-btn-m{gap:6px;padding:0 10px}.deg2-staff{padding:10px 8px 30px}.deg2-mobile-bar{z-index:60;padding:12px 16px calc(12px + env(safe-area-inset-bottom,0px));background:color-mix(in oklab, var(--bg) 90%, transparent);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-top:1px solid var(--line);align-items:center;gap:10px;display:flex;position:fixed;bottom:0;left:0;right:0}.deg2-mobile-bar .deg2-btn-m{flex:1;height:48px;display:inline-flex}.deg2-mobile-bar .deg2-btn-g{border-radius:50%;flex-shrink:0;width:48px;height:48px;padding:0;display:inline-flex}.deg2-mobile-bar .deg2-key-pill{flex-shrink:0}}@media (prefers-reduced-motion:reduce){.deg2-chip,.deg2-node,.deg2-note-hit .rn,.deg2-kb .wk,.deg2-kb .bk{transition:none}.deg2-node:hover{transform:none}}@media (max-width:900px) and (max-height:520px){.deg2-panel[data-mobile-open=true]{border:0;border-radius:0;max-height:100dvh;top:0}}