:root{--bg-primary: #1a1a2e;--bg-secondary: #16213e;--text-primary: #eee;--text-secondary: #aaa;--accent-blue: #4a9eff;--accent-red: #ff6b6b;--border-color: #333}*{box-sizing:border-box}html,body,#root{margin:0;padding:0;height:100%;width:100%}body{font-family:system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background-color:var(--bg-primary);color:var(--text-primary);overflow:hidden}.app{display:flex;flex-direction:column;height:100vh;max-height:100vh}.app-header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;background:var(--bg-secondary);border-bottom:1px solid var(--border-color);flex-shrink:0}.app-header h1{margin:0;font-size:1.5rem;font-weight:600}.header-actions{display:flex;align-items:center;gap:12px}.file-upload{display:flex;align-items:center;justify-content:center;padding:10px 20px;background:var(--bg-primary);border:2px dashed var(--border-color);border-radius:8px;cursor:pointer;transition:border-color .2s,background-color .2s}.file-upload:hover{border-color:var(--accent-blue);background:#4a9eff1a}.file-upload-content{display:flex;align-items:center;gap:10px;color:var(--text-secondary)}.file-upload-icon{font-size:1.5rem}.error-message{padding:12px 20px;background:#ff6b6b33;border-left:4px solid var(--accent-red);color:var(--accent-red)}.info-panel{padding:12px 20px;background:var(--bg-secondary);border-bottom:1px solid var(--border-color);flex-shrink:0}.info-panel h2{margin:0 0 8px;font-size:1.2rem;font-weight:500}.info-stats{display:flex;gap:20px;color:var(--text-secondary);font-size:.9rem}.attribution{margin-top:8px;color:var(--text-secondary);font-size:.8rem}.attribution a{color:var(--accent-blue);text-decoration:none}.attribution a:hover{text-decoration:underline}.main-content{flex:1;min-height:0;position:relative}.visualizer{width:100%;height:100%;cursor:pointer}.visualizer canvas{width:100%;height:100%;display:block}.piano-keyboard{display:block}.controls{padding:12px 20px;background:var(--bg-secondary);border-top:1px solid var(--border-color);flex-shrink:0}.controls-main{display:flex;align-items:center;gap:15px}.play-button{width:48px;height:48px;border-radius:50%;border:none;background:var(--accent-blue);color:#fff;font-size:1.2rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background-color .2s,transform .1s}.play-button:hover{background:#3a8eef}.play-button:active{transform:scale(.95)}.time-display{font-family:SF Mono,Consolas,monospace;font-size:.95rem;color:var(--text-secondary);min-width:100px}.time-separator{margin:0 4px;color:#666}.seek-bar{flex:1;height:6px;-webkit-appearance:none;appearance:none;background:#333;border-radius:3px;cursor:pointer}.seek-bar::-webkit-slider-thumb{-webkit-appearance:none;width:16px;height:16px;border-radius:50%;background:var(--accent-blue);cursor:pointer;border:none}.seek-bar::-moz-range-thumb{width:16px;height:16px;border-radius:50%;background:var(--accent-blue);cursor:pointer;border:none}.rate-select{padding:6px 12px;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:6px;color:var(--text-primary);font-size:.9rem;cursor:pointer}.loop-button,.loop-settings-button{width:40px;height:40px;border-radius:8px;border:1px solid var(--border-color);background:var(--bg-primary);color:var(--text-secondary);font-size:1.1rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background-color .2s,border-color .2s}.loop-button:hover,.loop-settings-button:hover{border-color:var(--accent-blue)}.loop-button.active{background:#4a9eff33;border-color:var(--accent-blue);color:var(--accent-blue)}.loop-settings{margin-top:12px;padding-top:12px;border-top:1px solid var(--border-color);display:flex;flex-direction:column;gap:8px}.loop-setting{display:flex;align-items:center;gap:10px}.loop-setting label{min-width:80px;color:var(--text-secondary);font-size:.9rem}.loop-setting input[type=range]{flex:1;height:4px;-webkit-appearance:none;appearance:none;background:#333;border-radius:2px}.loop-setting input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:12px;height:12px;border-radius:50%;background:var(--accent-blue);cursor:pointer}.loop-setting span{min-width:50px;font-family:SF Mono,Consolas,monospace;font-size:.85rem;color:var(--text-secondary)}.loop-setting button{padding:4px 12px;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:4px;color:var(--text-primary);font-size:.85rem;cursor:pointer}.loop-setting button:hover{border-color:var(--accent-blue)}.welcome-message{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text-secondary);text-align:center;padding:40px}.welcome-message p{margin:8px 0}.welcome-message .hint{font-size:.9rem}.welcome-message a{color:var(--accent-blue);text-decoration:none}.welcome-message a:hover{text-decoration:underline}.minimize-button{width:40px;height:40px;border-radius:8px;border:1px solid var(--border-color);background:var(--bg-primary);color:var(--text-secondary);font-size:1rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background-color .2s,border-color .2s}.minimize-button:hover{border-color:var(--accent-blue);color:var(--accent-blue)}.floating-controls{position:fixed;top:12px;right:12px;display:flex;gap:8px;padding:6px 10px;background:#16213ee6;border-radius:10px;border:1px solid var(--border-color);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:100}.floating-button{width:44px;height:44px;border-radius:50%;border:1px solid var(--border-color);background:var(--bg-primary);color:var(--text-primary);font-size:1.2rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background-color .2s,border-color .2s,transform .1s}.floating-button:hover{border-color:var(--accent-blue);background:#4a9eff1a}.floating-button:active{transform:scale(.95)}.settings-button{width:40px;height:40px;border-radius:8px;border:1px solid var(--border-color);background:var(--bg-primary);color:var(--text-secondary);font-size:1.2rem;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background-color .2s,border-color .2s}.settings-button:hover{border-color:var(--accent-blue);color:var(--accent-blue)}.settings-overlay{position:fixed;inset:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:1000}.settings-panel{background:var(--bg-secondary);border-radius:12px;width:90%;max-width:400px;max-height:80vh;overflow-y:auto;box-shadow:0 8px 32px #0006}.settings-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border-color)}.settings-header h2{margin:0;font-size:1.2rem;font-weight:600}.settings-close{width:32px;height:32px;border:none;background:transparent;color:var(--text-secondary);font-size:1.5rem;cursor:pointer;display:flex;align-items:center;justify-content:center;border-radius:6px;transition:background-color .2s}.settings-close:hover{background:#ffffff1a;color:var(--text-primary)}.settings-content{padding:16px 20px}.settings-section{margin-bottom:20px}.settings-section:last-child{margin-bottom:0}.settings-section h3{margin:0 0 12px;font-size:.9rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px}.settings-row{display:flex;align-items:center;margin-bottom:10px}.settings-row:last-child{margin-bottom:0}.settings-row label{display:flex;align-items:center;gap:10px;cursor:pointer;font-size:.95rem}.settings-row input[type=checkbox]{width:18px;height:18px;cursor:pointer;accent-color:var(--accent-blue)}.settings-loop-range{margin-top:12px;padding:12px;background:var(--bg-primary);border-radius:8px}.settings-loop-range .settings-row{flex-direction:column;align-items:stretch;gap:6px}.settings-loop-range .settings-row label{font-size:.85rem;color:var(--text-secondary)}.settings-loop-range input[type=range]{width:100%;height:4px;-webkit-appearance:none;appearance:none;background:#333;border-radius:2px}.settings-loop-range input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:14px;height:14px;border-radius:50%;background:var(--accent-blue);cursor:pointer}.settings-speed{margin-top:8px}.settings-speed .settings-row{flex-direction:column;align-items:stretch;gap:8px}.settings-speed .settings-row label{font-size:.9rem;color:var(--text-primary)}.settings-speed input[type=range]{width:100%;height:6px;-webkit-appearance:none;appearance:none;background:#333;border-radius:3px}.settings-speed input[type=range]::-webkit-slider-thumb{-webkit-appearance:none;width:18px;height:18px;border-radius:50%;background:var(--accent-blue);cursor:pointer}.speed-presets{display:flex;gap:6px;margin-top:10px;flex-wrap:wrap}.speed-preset{padding:6px 12px;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:6px;color:var(--text-secondary);font-size:.85rem;cursor:pointer;transition:background-color .2s,border-color .2s,color .2s}.speed-preset:hover{border-color:var(--accent-blue);color:var(--text-primary)}.speed-preset.active{background:#4a9eff33;border-color:var(--accent-blue);color:var(--accent-blue)}.help-button{position:absolute;top:12px;right:12px;width:40px;height:40px;border-radius:50%;border:1px solid var(--border-color);background:#16213ee6;color:var(--text-secondary);font-size:1.2rem;font-weight:600;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background-color .2s,border-color .2s,color .2s;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:100}.menu-minimized .help-button{position:fixed}.help-button:hover{border-color:var(--accent-blue);color:var(--accent-blue);background:#4a9eff1a}.help-overlay{position:fixed;inset:0;background:#0009;display:flex;align-items:center;justify-content:center;z-index:1000}.help-panel{background:var(--bg-secondary);border-radius:12px;width:90%;max-width:400px;box-shadow:0 8px 32px #0006}.help-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border-color)}.help-header h2{margin:0;font-size:1.2rem;font-weight:600}.help-close{width:32px;height:32px;border:none;background:transparent;color:var(--text-secondary);font-size:1.5rem;cursor:pointer;display:flex;align-items:center;justify-content:center;border-radius:6px;transition:background-color .2s}.help-close:hover{background:#ffffff1a;color:var(--text-primary)}.help-content{padding:16px 20px}.help-row{display:flex;align-items:center;justify-content:space-between;padding:8px 0;border-bottom:1px solid rgba(255,255,255,.05)}.help-row:last-child{border-bottom:none}.help-row span{color:var(--text-secondary);font-size:.9rem}kbd{display:inline-block;padding:4px 8px;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:4px;font-family:SF Mono,Consolas,monospace;font-size:.85rem;color:var(--text-primary);margin-right:4px}.help-footer{padding:12px 20px;border-top:1px solid var(--border-color);text-align:center;color:var(--text-secondary);font-size:.85rem}.overlay-info{position:absolute;top:12px;left:12px;display:flex;flex-direction:column;gap:4px;padding:10px 14px;background:#16213ed9;border-radius:8px;border:1px solid var(--border-color);-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);z-index:100}.menu-minimized .overlay-info{position:fixed}.overlay-info-item{font-family:SF Mono,Consolas,monospace;font-size:.85rem;color:var(--text-secondary)}.overlay-info-muted{color:var(--accent-red)}@media(max-width:768px){.app-header{flex-direction:column;gap:12px;padding:10px 15px}.app-header h1{font-size:1.2rem}.file-upload{width:100%}.controls-main{flex-wrap:wrap;gap:10px}.seek-bar{order:10;width:100%;flex:none}}