:root{--bg: #0f1115;--panel: #161a22;--panel-2: #1d2330;--text: #e7ecf3;--muted: #8a93a4;--accent: #ff5a7a;--accent-2: #ffd166;--key-white: #f5f5f5;--key-black: #1a1a1a;--key-active: #ff5a7a;--border: #2a3142;--safe-top: env(safe-area-inset-top, 0px);--safe-bottom: env(safe-area-inset-bottom, 0px)}*{box-sizing:border-box}html,body{margin:0;padding:0;height:100%;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang TC,Microsoft JhengHei,Roboto,sans-serif;-webkit-font-smoothing:antialiased;overflow:hidden;overscroll-behavior:none}#app{display:grid;grid-template-rows:auto 1fr auto;height:100dvh;padding-top:var(--safe-top);padding-bottom:var(--safe-bottom)}.topbar{background:var(--panel);border-bottom:1px solid var(--border);padding:8px 12px;display:flex;flex-direction:column;gap:6px}.topbar h1{margin:0;font-size:15px;font-weight:600;letter-spacing:.02em;color:var(--muted)}.controls{display:flex;flex-wrap:wrap;gap:6px;align-items:center}.controls button,.controls .file-btn span{background:var(--panel-2);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:8px 12px;font-size:14px;cursor:pointer;-webkit-user-select:none;user-select:none;min-width:44px;min-height:38px;display:inline-flex;align-items:center;justify-content:center}.controls button:disabled{opacity:.4;cursor:not-allowed}.controls .file-btn span{background:linear-gradient(135deg,#ff5a7a,#ff8e53);border:none;color:#fff;font-weight:600}.controls .ghost-btn,.controls .append-btn span{background:var(--panel-2);color:var(--text);border:1px solid var(--border)}.controls .append-btn input[disabled]+span,.controls .ghost-btn:disabled{opacity:.4;cursor:not-allowed}.progress{width:100%;padding:2px 0}.progress-bar{height:4px;background:var(--panel-2);border-radius:2px;overflow:hidden;position:relative}.progress-fill{height:100%;background:linear-gradient(90deg,#ff5a7a,#ff8e53);width:0%;transition:width .25s ease-out}.progress.indeterminate .progress-fill{width:35%;animation:indet 1.2s linear infinite}@keyframes indet{0%{transform:translate(-110%)}to{transform:translate(310%)}}.bm-dialog{border:1px solid var(--border);background:var(--panel);color:var(--text);border-radius:14px;padding:0;width:min(420px,92vw);max-height:80dvh;box-shadow:0 20px 50px #0009}.bm-dialog::backdrop{background:#0000008c;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.bm-content{display:flex;flex-direction:column;padding:14px;gap:10px;max-height:80dvh}.bm-header{display:flex;align-items:center;justify-content:space-between}.bm-header h2{margin:0;font-size:17px}.bm-close{background:transparent;border:none;color:var(--muted);font-size:18px;cursor:pointer;padding:4px 8px}.bm-save{display:flex;gap:6px}.bm-save input{flex:1;background:var(--panel-2);color:var(--text);border:1px solid var(--border);border-radius:8px;padding:8px 10px;font-size:14px}.bm-save button{background:linear-gradient(135deg,#ff5a7a,#ff8e53);color:#fff;border:none;border-radius:8px;padding:8px 12px;font-size:14px;font-weight:600;cursor:pointer;white-space:nowrap}.bm-save button:disabled{opacity:.4;cursor:not-allowed;background:var(--panel-2);color:var(--muted)}.bm-list{list-style:none;margin:0;padding:0;overflow-y:auto;max-height:50dvh}.bm-list li{display:flex;align-items:center;gap:8px;padding:8px 4px;border-bottom:1px solid var(--border)}.bm-list li:last-child{border-bottom:none}.bm-name{flex:1;font-size:14px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.bm-meta{font-size:11px;color:var(--muted)}.bm-list button{background:var(--panel-2);color:var(--text);border:1px solid var(--border);border-radius:6px;padding:6px 10px;font-size:13px;cursor:pointer}.bm-list button.bm-load{background:linear-gradient(135deg,#ff5a7a,#ff8e53);color:#fff;border:none}.bm-list button.bm-append{background:#2a3142}.bm-list button.bm-delete{color:#ff5a7a}.bm-empty{font-size:13px;color:var(--muted);text-align:center;padding:16px 4px 4px}.bm-empty.hidden{display:none}.controls .bpm,.controls .sound-toggle{display:inline-flex;align-items:center;gap:4px;font-size:13px;color:var(--muted)}.controls .bpm input{width:56px;background:var(--panel-2);color:var(--text);border:1px solid var(--border);border-radius:6px;padding:6px 8px;font-size:14px;text-align:center}.status{font-size:12px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.status.error{color:#ff5a7a}.status.ok{color:#88e0a8}.panel{background:var(--panel);overflow:hidden}.sheet-panel{border-bottom:1px solid var(--border);background:#fafafa;position:relative;overflow:auto;-webkit-overflow-scrolling:touch}#sheet-container{min-height:100%;padding:6px}.osmd-note-active{transform-box:fill-box;transform-origin:center;transform:scale(1.6);transition:transform .08s ease-out,fill .08s ease-out}.osmd-note-active *{fill:var(--accent)!important;stroke:var(--accent)!important}.osmd-note-selected:not(.osmd-note-active) *{fill:#4a8cff!important;stroke:#4a8cff!important}.osmd-note-selected:not(.osmd-note-active){transform-box:fill-box;transform-origin:center;transform:scale(1.3)}.piano-panel{background:#0a0d12;height:28dvh;min-height:140px;max-height:240px;border-top:1px solid var(--border)}#piano-scroll{width:100%;height:100%;overflow-x:auto;overflow-y:hidden;-webkit-overflow-scrolling:touch}#piano{display:block;height:100%;touch-action:none;user-select:none;-webkit-user-select:none}.key-white,.key-black{cursor:pointer}.key-white{fill:var(--key-white);stroke:#888;stroke-width:1}.key-black{fill:var(--key-black);stroke:#000}.key-white.active{fill:var(--accent)}.key-black.active{fill:var(--accent-2)}.key-label{fill:#444;font-size:10px;pointer-events:none;-webkit-user-select:none;user-select:none;font-family:-apple-system,sans-serif}.key-label.octave-c{fill:#888;font-weight:600}@media(min-width:768px){.topbar h1{font-size:17px}.piano-panel{height:22dvh}.controls button,.controls .file-btn span{font-size:15px}}@media(orientation:landscape)and (max-height:500px){.topbar{padding:4px 8px}.topbar h1{display:none}.piano-panel{height:36dvh}}