:root{--bg:#f2f2f7;--card:#fff;--ink:#1c1c1e;--ink-2:#3a3a3c;--muted:#6c6c70;--line:#e5e5ea;--fill:#e3e3e8;--accent:#06c;--switch-off:#8e8e93;--wood-a:#3b281a;--wood-b:#2a1b12;--ivory:#f4efe3;--note-bg:#2e1f15;--note-root:#5aaeff;--note-root-ink:#06182b;--wood-text:#bdb5a4;--wood-text-2:#d8d2c4;--fret:#a9a396;--nut:#e6dfcb;--string:#d9d3c4;--string-wound:#bfb08f;--inlay:#8f8672;--font:-apple-system, BlinkMacSystemFont, "SF Pro Text", "Apple SD Gothic Neo", "Noto Sans KR", "Hiragino Sans", "Noto Sans JP", system-ui, sans-serif;--mono:ui-monospace, Menlo, Consolas, monospace;--hit:44px}*{box-sizing:border-box}body{font-family:var(--font);color:var(--ink);background:var(--bg);font-variant-numeric:tabular-nums;-webkit-font-smoothing:antialiased;margin:0}#app{flex-direction:column;min-height:100dvh;display:flex}button,select,input{font:inherit;color:inherit}button{cursor:pointer}button:active{opacity:.7}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}[hidden]{display:none!important}.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}.topbar{z-index:2;-webkit-backdrop-filter:saturate(180%)blur(20px);background:#ffffffb8;border-bottom:1px solid #00000014;position:sticky;top:0}.topbar-inner{align-items:center;gap:20px;max-width:1280px;margin:0 auto;padding:10px 32px;display:flex}.brand{letter-spacing:-.01em;flex:1;font-size:17px;font-weight:600}.top-actions{flex:1;justify-content:flex-end;display:flex}.top-actions select{min-height:var(--hit);background:var(--fill);border:0;border-radius:10px;padding:0 10px;font-size:14px}.page{flex:1;width:100%;max-width:1280px;margin:0 auto;padding:28px 32px 40px}.screen{flex-direction:column;gap:18px;display:flex}.seg{background:var(--fill);border-radius:9px;padding:2px;display:flex}.seg button{white-space:nowrap;background:0 0;border:0;border-radius:7px;flex:1;min-height:32px;padding:0 10px;font-size:14px}.seg button[aria-pressed=true],.seg button[aria-current=page]{background:#fff;font-weight:600;box-shadow:0 1px 3px #0000001f}.head{flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:12px 24px;display:flex}.head h1{letter-spacing:-.025em;margin:0;font-size:36px;font-weight:700;line-height:1.1}.head p{color:var(--muted);margin:6px 0 0;font-size:15px}.pager{align-items:center;gap:8px;display:flex}.pager-status{text-align:center;min-width:170px;font-size:15px;font-weight:600}.btn-icon{width:var(--hit);height:var(--hit);background:var(--fill);border:0;border-radius:10px;flex:none;font-size:24px;line-height:1}.btn-link{min-height:var(--hit);color:var(--accent);background:0 0;border:0;padding:0 10px;font-size:15px}.chips{scrollbar-width:none;gap:8px;padding:2px 0;display:flex;overflow-x:auto}.chip{min-height:var(--hit);background:var(--card);white-space:nowrap;border:0;border-radius:10px;flex:none;padding:0 16px;font-size:14px}.chip[aria-pressed=true]{background:var(--ink);color:#fff;font-weight:600}.chip-round{width:var(--hit);border-radius:50%;padding:0;font-size:15px;font-weight:600}.chip-link{color:var(--accent);background:0 0}.scale-row{align-items:center;gap:8px;display:flex}.scale-row .chips{flex:1;min-width:0}.board-card{background:repeating-linear-gradient(0deg, #0000001a 0, #0000001a 1px, transparent 1px, transparent 6px), linear-gradient(180deg, var(--wood-a), var(--wood-b));border-radius:18px;overflow:hidden}.board-scroll{padding:18px 12px 6px;overflow-x:auto}.board-svg{width:100%;height:auto;display:block}.fret-wire{stroke:var(--fret);stroke-width:2px}.nut{stroke:var(--nut);stroke-width:6px}.string{stroke:var(--string)}.string.wound{stroke:var(--string-wound)}.inlay{fill:var(--inlay)}.fret-num{fill:var(--wood-text);text-anchor:middle;font-size:13px}.fret-num.mark{font-weight:700}.string-name{fill:var(--wood-text);dominant-baseline:central;font-size:14px;font-weight:600}.note circle{fill:var(--note-bg);stroke:var(--ivory);stroke-width:1.5px}.note text{fill:var(--ivory);text-anchor:middle;dominant-baseline:central;font-size:14px;font-weight:600}.note-root circle{fill:var(--note-root);stroke:none}.note-root text{fill:var(--note-root-ink);font-weight:700}.note-chord circle{fill:var(--ivory);stroke:none}.note-chord text{fill:var(--ink);font-weight:700}.note-avoid circle{stroke-width:2px;stroke-dasharray:4 3}.note-avoid text{font-weight:700}.note .tap{fill:#0000;stroke:none}.board-end{fill:#00000073;pointer-events:none}.note.is-dim{opacity:.3}.note{cursor:pointer}.legend{color:var(--wood-text-2);border-top:1px solid #f4efe329;flex-wrap:wrap;gap:8px 22px;padding:12px 20px 16px;font-size:13px;display:flex}.legend-item{align-items:center;gap:8px;display:flex}.swatch{border-radius:50%;width:18px;height:18px}.swatch-root{background:var(--note-root)}.swatch-chord{background:var(--ivory)}.swatch-scale{background:var(--note-bg);border:1.5px solid var(--ivory)}.swatch-avoid{background:var(--note-bg);border:2px dashed var(--ivory)}.sound-card{flex-direction:column;gap:12px;padding:18px 20px;display:flex}.sound-card h2{letter-spacing:-.01em;margin:0;font-size:20px;font-weight:700}.sound-row{flex-wrap:wrap;align-items:center;gap:14px;display:flex}.sound-tempo,.sound-beats{align-items:center;gap:8px;font-size:14px;display:flex}.sound-tempo input{width:84px;min-height:var(--hit);background:var(--fill);text-align:center;border:0;border-radius:10px;padding:0 10px;font-size:15px}.sound-beats select{min-height:var(--hit);background:var(--fill);border:0;border-radius:10px;padding:0 10px;font-size:15px}.sound-hint{color:var(--muted);margin:0;font-size:14px}.btn-secondary[aria-pressed=true]{background:var(--ink);color:#fff}.audio-row{flex-wrap:wrap;align-items:stretch;gap:18px;display:flex}.audio-row>.card{flex:420px;min-width:0}.backing-card{flex-direction:column;gap:12px;padding:18px 20px;display:flex}.backing-card h2{letter-spacing:-.01em;margin:0;font-size:20px;font-weight:700}.backing-row{flex-wrap:wrap;align-items:center;gap:14px;display:flex}.backing-key{color:var(--muted);font-size:14px}.backing-row select{min-height:var(--hit);background:var(--fill);border:0;border-radius:10px;padding:0 10px;font-size:15px}.bar-chips{flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none;display:flex}.bar-chip{background:var(--fill);text-align:center;border-radius:10px;min-width:52px;padding:10px 12px;font-size:15px;font-weight:600}.bar-chip[aria-current=true]{background:var(--ink);color:#fff}.backing-now{margin:0;font-size:18px;font-weight:700}.backing-now:empty,.backing-status:empty{display:none}.backing-row .song-field{flex-wrap:wrap;min-width:0;max-width:100%}.backing-row select{text-overflow:ellipsis;min-width:0;max-width:100%}.mixer{grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:6px 18px;display:grid}.mix-row{grid-template-columns:1fr auto 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.n{font-size:18px;font-weight:700;line-height:1}.string-pick small{color:var(--muted);font-size:11px;line-height:1}.string-pick[aria-pressed=true]{background:var(--ink);color:#fff}.string-pick[aria-pressed=true] small{color:var(--line)}.tuner-status{color:var(--ink-2);margin:0;padding:0 4px;font-size:14px;line-height:1.5}.tuner-actions{gap:10px;display:flex}.btn-primary{background:var(--accent);color:#fff;border:0;border-radius:12px;min-height:48px;padding:0 22px;font-size:16px;font-weight:600}.btn-secondary{background:var(--fill);border:0;border-radius:12px;min-height:48px;padding:0 20px;font-size:15px;font-weight:600}.ad-slot{min-height:90px;margin:24px 0 0}@media (width<=1279px){.topbar-inner{padding:10px 24px}.page{padding:22px 24px 32px}.seg button{min-height:var(--hit)}}@media (width>=640px) and (width<=1279px){.board-svg{width:max(142.169%,1180px);max-width:none}}@media (width<=639px){.topbar{-webkit-backdrop-filter:none;background:0 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print{.help,.info-steps-row{display:none!important}}.log-stat-top{justify-content:space-between;margin:-4px -8px 0 0}.pager-part{white-space:nowrap}@media (width<=639px){.pager{flex-wrap:wrap;row-gap:4px}.pager-status{flex:1 1 0}.pager .btn-link{flex:100%;order:1}}.nav-top{background:var(--fill);border-radius:10px;flex:none;gap:2px;padding:2px;display:flex}.nav-top button{min-height:var(--hit);color:var(--ink-2);white-space:nowrap;background:0 0;border:0;border-radius:8px;justify-content:center;align-items:center;gap:6px;padding:0 12px;font-size:14px;line-height:1.15;display:flex}.nav-top svg{flex:none;width:18px;height:18px}.nav-top button[aria-current=page]{color:var(--ink);background:#fff;font-weight:600;box-shadow:0 1px 3px #0000001f}@media (width>=640px) and (width<=1099px){.topbar-inner{flex-wrap:wrap;row-gap:8px}.nav-top{flex:100%;order:3}.top-actions{flex:none;margin-left:auto}.nav-top button{white-space:normal;text-align:center;flex:1 1 0;min-width:0;padding:4px 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