:root{--bg: #0f1117;--panel: #1a1d27;--border: #2a2f3d;--text: #e6e8ee;--muted: #8a92a6;--accent: #6ea8fe;--accent-hover: #4f8ff0;--error: #ff6b6b}*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif;min-height:100vh}.app{max-width:1100px;margin:0 auto;padding:32px 24px 64px}header h1{margin:0;font-size:28px;letter-spacing:-.02em}header p{margin:8px 0 28px;color:var(--muted);font-size:14px}.header-row{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:0}.help-btn{display:flex;align-items:center;gap:6px;background:transparent;border:1px solid var(--border);color:var(--muted);font-size:13px;font-weight:500;padding:6px 14px;border-radius:8px;cursor:pointer;flex-shrink:0;transition:color .15s,border-color .15s,background .15s}.help-btn:hover{color:var(--text);border-color:var(--accent);background:#6ea8fe0f}.help-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#0000008c;display:flex;align-items:center;justify-content:center;z-index:1000;padding:24px;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px)}.help-modal{background:var(--panel);border:1px solid var(--border);border-radius:16px;width:100%;max-width:560px;max-height:82vh;display:flex;flex-direction:column;box-shadow:0 24px 64px #00000080}.help-modal-header{display:flex;align-items:center;justify-content:space-between;padding:20px 24px 16px;border-bottom:1px solid var(--border);flex-shrink:0}.help-modal-header h2{margin:0;font-size:17px;font-weight:600;letter-spacing:-.01em}.help-close-btn{background:transparent;border:0;color:var(--muted);cursor:pointer;padding:4px;border-radius:6px;display:flex;align-items:center;justify-content:center;transition:color .15s,background .15s}.help-close-btn:hover{color:var(--text);background:#ffffff12}.help-modal-body{overflow-y:auto;padding:20px 24px 24px;display:flex;flex-direction:column;gap:20px}.help-section h3{margin:0 0 8px;font-size:14px;font-weight:600;color:var(--text)}.help-section p{margin:0;font-size:13.5px;color:var(--muted);line-height:1.65}.help-section ul{margin:0;padding-left:18px;font-size:13.5px;color:var(--muted);line-height:1.65;display:flex;flex-direction:column;gap:5px}.help-section ul strong{color:var(--text);font-weight:600}.upload-card{margin-bottom:24px}.drop-zone{border:2px dashed #3d4460;border-radius:16px;padding:52px 32px 44px;text-align:center;cursor:pointer;transition:border-color .18s,background .18s,box-shadow .18s;background:var(--panel);display:block}.drop-zone:hover{border-color:var(--accent);background:#1e2235;box-shadow:0 0 0 4px #6ea8fe1a}.drop-zone.dragging{border-color:var(--accent);background:#1e2438;box-shadow:0 0 0 6px #6ea8fe2e}.drop-zone-icon{display:flex;align-items:center;justify-content:center;width:56px;height:56px;border-radius:14px;background:#6ea8fe1f;margin:0 auto 18px;color:var(--accent)}.drop-zone h2{margin:0 0 6px;font-size:18px;font-weight:600;letter-spacing:-.01em;color:var(--text)}.drop-zone p{margin:0 0 20px;color:var(--muted);font-size:13.5px}.drop-zone-browse{display:inline-block;background:var(--accent);color:#0a0d14;font-weight:600;font-size:14px;padding:9px 22px;border-radius:8px;pointer-events:none}.drop-zone-formats{margin-top:14px;font-size:12px;color:#555e7a;letter-spacing:.01em}.file-selected-card{background:var(--panel);border:1px solid var(--border);border-radius:14px;padding:16px 20px;display:flex;align-items:center;gap:14px}.file-icon{flex-shrink:0;width:42px;height:42px;border-radius:10px;background:#6ea8fe1f;display:flex;align-items:center;justify-content:center;color:var(--accent)}.file-meta{flex:1;min-width:0}.file-meta strong{display:block;font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;color:var(--text);margin-bottom:2px}.file-meta span{font-size:12px;color:var(--muted)}.file-actions{display:flex;align-items:center;gap:8px;flex-shrink:0}.button{background:var(--accent);color:#0a0d14;border:0;font-weight:600;font-size:14px;padding:10px 18px;border-radius:8px;cursor:pointer;transition:background .15s}.button:hover:not(:disabled){background:var(--accent-hover)}.button:disabled{opacity:.5;cursor:not-allowed}.button.ghost{background:transparent;color:var(--text);border:1px solid var(--border)}.button.ghost:hover:not(:disabled){background:var(--panel)}.actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}.error{background:#ff6b6b1a;border:1px solid rgba(255,107,107,.3);color:var(--error);padding:12px 14px;border-radius:8px;font-size:13px;margin-top:12px}.stats{display:flex;gap:20px;flex-wrap:wrap;margin:14px 0 18px;font-size:13px;color:var(--muted)}.stats span strong{color:var(--text);font-weight:600}.score-card{background:#fff;border-radius:12px;padding:24px 16px;min-height:200px}.score-card .osmd-host{width:100%}.spinner{display:inline-block;width:14px;height:14px;border:2px solid rgba(255,255,255,.3);border-top-color:#0a0d14;border-radius:50%;animation:spin .7s linear infinite;vertical-align:middle;margin-right:6px}.spinner.dark{border-color:#00000026;border-top-color:var(--text)}@keyframes spin{to{transform:rotate(360deg)}}.mode-toggle{display:flex;background:var(--bg);border:1px solid var(--border);border-radius:8px;padding:3px;gap:2px}.mode-btn{background:transparent;border:0;color:var(--muted);font-size:13px;font-weight:500;padding:5px 12px;border-radius:6px;cursor:pointer;transition:background .12s,color .12s;white-space:nowrap}.mode-btn:hover:not(:disabled){color:var(--text);background:#ffffff0d}.mode-btn.active{background:var(--accent);color:#0a0d14;font-weight:600}.mode-btn:disabled{opacity:.45;cursor:not-allowed}.play-both-row{display:flex;justify-content:center;margin-top:10px}.play-both-btn{background:transparent;color:var(--text);border:1px solid var(--border);font-size:13px;padding:8px 20px}.play-both-btn:hover:not(:disabled){background:#6ea8fe14;border-color:var(--accent);color:var(--accent)}.waveform-card{margin-top:14px;background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:10px 14px}.waveform-controls{display:flex;align-items:center;gap:12px}.play-btn{flex-shrink:0;width:36px;height:36px;border-radius:50%;border:1px solid var(--border);background:var(--panel);color:var(--text);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .15s,border-color .15s;padding:0}.play-btn:hover{background:var(--accent);border-color:var(--accent);color:#0a0d14}.waveform-wrap{flex:1;min-width:0}.waveform-time{flex-shrink:0;font-size:12px;color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap}.midi-player-card{margin-top:8px;border-color:#3d2f5a;background:#16111f}.midi-label{font-size:11px;font-weight:600;letter-spacing:.04em;color:#9f7aea;margin-bottom:8px;display:flex;align-items:center;gap:7px}.midi-badge{background:#a78bfa26;color:#a78bfa;border:1px solid rgba(167,139,250,.3);border-radius:4px;padding:1px 6px;font-size:10px;font-weight:700;letter-spacing:.06em}.midi-play-btn:hover{background:#7c3aed;border-color:#7c3aed;color:#fff}.output-tabs{display:flex;gap:0;margin:16px 0 0;border-bottom:1px solid var(--border)}.out-tab{background:none;border:none;border-bottom:2px solid transparent;color:var(--muted);cursor:pointer;font-size:13px;font-weight:500;margin-bottom:-1px;padding:8px 20px 10px;transition:color .15s,border-color .15s}.out-tab:hover{color:var(--text)}.out-tab.active{border-bottom-color:var(--accent);color:var(--accent)}.jianpu-display{padding:20px 16px 12px}.jianpu-header{display:flex;gap:20px;font-size:12px;color:var(--muted);margin-bottom:14px;font-style:italic}.jianpu-rows{overflow-x:auto}.jp-row-svg{overflow:visible}.guitar-tab-display{padding:20px 16px 12px}.tab-header{display:flex;gap:20px;font-size:12px;color:var(--muted);margin-bottom:14px;font-style:italic}.tab-scroll{overflow-x:auto;overflow-y:hidden}.tab-svg{display:block}.tab-lbl{font-size:12px;font-family:monospace;fill:var(--muted)}.tab-string{stroke:var(--border);stroke-width:1}.tab-bar{stroke:var(--muted);stroke-width:1.5}.tab-note-bg{fill:var(--panel)}.tab-fret{font-size:12px;font-family:monospace;font-weight:700;fill:var(--accent)}