:root{--bg: #0a0712;--accent: #b14bff;--accent-glow: rgba(177, 75, 255, .6);--text: #e8e0f5}*{box-sizing:border-box;margin:0;padding:0}html,body,#app{height:100%;width:100%}body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;overflow:hidden}#app{display:flex;flex-direction:column}.topbar{display:flex;align-items:center;gap:1.5rem;padding:.75rem 1.25rem;background:#140c20d9;border-bottom:1px solid rgba(177,75,255,.25);z-index:2}.topbar h1{font-size:1.1rem;font-weight:600;letter-spacing:.02em}.controls{display:flex;align-items:center;gap:.75rem}button,.file-btn{background:linear-gradient(135deg,#7a2fd6,var(--accent));color:#fff;border:none;border-radius:8px;padding:.5rem 1rem;font-size:.9rem;font-weight:600;cursor:pointer;transition:filter .15s ease,opacity .15s ease}button:hover:not(:disabled),.file-btn:hover{filter:brightness(1.15)}button:disabled{opacity:.4;cursor:not-allowed}.toggle{padding:.4rem .75rem;font-size:.8rem}.track-name{font-size:.85rem;opacity:.65}#sheet{height:42%;overflow-y:auto;background:#f6f2fb;padding:1rem 1.25rem}#sheet:empty:before{content:"Load a MusicXML file to see the score here.";display:block;color:#7a7088;font-size:.9rem;padding:1rem}#stage{flex:1;display:block;width:100%;min-height:0}