:root{--background:#f6f7fb;--surface:#fff;--surface-soft:#eef2f7;--surface-blue:#eef5ff;--foreground:#10131a;--muted:#5d6471;--muted-light:#818895;--border:#dce1e9;--border-strong:#c7ced9;--primary:#2563eb;--primary-hover:#1d4ed8;--primary-soft:#dbeafe;--midi:#1d8fa0;--warning:#9a6700;--danger:#b42318;--shadow:0 20px 70px #161e2e17;--shadow-soft:0 10px 35px #161e2e12}*{box-sizing:border-box}html{scroll-behavior:smooth}body{background:var(--background);color:var(--foreground);text-rendering:optimizelegibility;margin:0;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:16px;line-height:1.65}body.modal-open{overflow:hidden}button,input{font:inherit}button,a{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}p{margin:0 0 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var(--border);background:var(--surface);min-height:360px;box-shadow:var(--shadow);border-radius:28px;transition:border-color .18s,box-shadow .18s;position:relative;overflow:hidden}.converter-card-dragging{border-color:var(--primary);box-shadow:0 0 0 5px #2563eb1f, var(--shadow)}.converter-card-result{min-height:auto;overflow:visible}.converter-motion{z-index:0;pointer-events:none;position:absolute;inset:0;overflow:hidden}.converter-motion:after{content:"";background:repeating-linear-gradient(#0000 0 35px,#10131a0e 36px),repeating-linear-gradient(90deg,#0000 0 69px,#10131a0e 70px);position:absolute;inset:0 0 0 50%}.motion-divider{z-index:2;background:#10131a33;width:1px;position:absolute;top:28px;bottom:28px;left:50%}.moving-symbol,.midi-particle{z-index:1;opacity:0;position:absolute}.moving-symbol{color:#0a0b0e;font-family:Georgia,Times New Roman,serif;font-size:1.5rem;animation:5.8s linear infinite 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var(--border-strong);background:var(--surface);grid-template-rows:repeat(7,1fr);width:34px;display:grid;position:absolute;inset:0 auto 0 0}.piano-keyboard span{border-bottom:1px solid var(--border);color:var(--muted-light);justify-content:center;align-items:center;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.65rem;display:flex}.piano-scroll{z-index:1;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:#b9c2cf transparent;position:absolute;inset:0 0 0 34px;overflow:auto hidden}.piano-scroll-pan{cursor:grab}.piano-scroll-panning{cursor:grabbing;-webkit-user-select:none;user-select:none}.piano-grid{background:repeating-linear-gradient(#0000 0 37px,#10131a14 38px),repeating-linear-gradient(90deg,#0000 0 59px,#10131a12 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var(--border);padding-left:24px}.fine-tune h3{margin-bottom:22px}.range-label{justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px;font-size:.88rem;font-weight:650;display:flex}.range-label output{color:var(--primary);font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.78rem}.fine-tune input[type=range]{width:100%;accent-color:var(--primary)}.fine-tune>p{color:var(--muted);margin:5px 0 20px;font-size:.76rem;line-height:1.5}.switch-row{border-top:1px solid var(--border);border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:12px;margin-top:4px;padding:13px 0;font-size:.86rem;font-weight:650;display:flex}.switch-row span{gap:2px;display:grid}.switch-row small{color:var(--muted);font-size:.7rem;font-weight:450}.switch-row input{width:42px;height:22px;accent-color:var(--primary)}.download-button{width:100%;margin-top:18px}.editor-guide{border-top:1px solid var(--border);margin-top:28px;padding-top:26px}.editor-guide-heading{max-width:680px;margin-bottom:22px}.editor-guide-heading>span{color:var(--primary);letter-spacing:.14em;font-size:.68rem;font-weight:750}.editor-guide-heading h3{margin:4px 0 7px;font-size:1.22rem}.editor-guide-heading p{color:var(--muted);margin:0;font-size:.84rem}.editor-guide-grid{grid-template-columns:minmax(0,1.35fr) minmax(260px,.65fr);gap:28px;display:grid}.editing-steps{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin:0;padding:0;list-style:none;display:grid}.editing-steps li{border:1px solid var(--border);background:var(--surface);border-radius:13px;grid-template-columns:auto minmax(0,1fr);align-items:start;gap:11px;min-width:0;padding:14px;display:grid}.editing-steps li>span{background:var(--surface-blue);width:29px;height:29px;color:var(--primary);border-radius:9px;place-items:center;font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.66rem;font-weight:750;display:grid}.editing-steps strong{margin-bottom:3px;font-size:.82rem;display:block}.editing-steps p{color:var(--muted);margin:0;font-size:.72rem;line-height:1.5}.shortcut-card{border:1px solid var(--border);background:var(--surface-soft);border-radius:15px;padding:18px}.shortcut-card h4{margin:0 0 12px;font-size:.93rem}.shortcut-card dl{margin:0}.shortcut-card dl>div{border-top:1px solid var(--border);justify-content:space-between;align-items:center;gap:12px;padding:9px 0;display:flex}.shortcut-card dt,.shortcut-card dd{margin:0;font-size:.7rem}.shortcut-card dt{color:var(--foreground);flex:none;font-weight:650}.shortcut-card dd{color:var(--muted);text-align:right}.shortcut-card kbd{border:1px solid 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var(--border);background:var(--surface);width:38px;height:38px;color:var(--muted);cursor:pointer;border-radius:50%;place-items:center;display:grid;position:absolute;top:18px;right:18px}.modal-close:hover{color:var(--foreground);background:var(--surface-soft)}.modal-heading{text-align:center;max-width:620px;margin:0 auto 22px;padding:0 32px}.modal-file{color:var(--primary);text-overflow:ellipsis;white-space:nowrap;margin-bottom:8px;font-size:.75rem;font-weight:650;display:block;overflow:hidden}.modal-heading h2{margin-bottom:8px;font-size:clamp(1.7rem,4vw,2.4rem)}.modal-heading p{color:var(--muted);margin:0;font-size:.9rem}.preset-grid{grid-template-columns:repeat(4,minmax(0,1fr));gap:11px;display:grid}.preset-card{border:1px solid var(--border);background:var(--surface);min-height:138px;color:var(--foreground);text-align:left;cursor:pointer;border-radius:16px;flex-direction:column;align-items:flex-start;gap:5px;padding:17px;transition:border-color .16s,background-color .16s,transform 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