:root{--bg:#f5f6f8;--panel:#fff;--border:#e5e7eb;--text:#1f2937;--muted:#6b7280;--primary:#2d6dfa;--primary-2:#1f5edc;--danger:#ef4444;--accent:#2563eb;--radius:14px;--shadow:0 8px 30px rgba(34,41,69,.08)}*{box-sizing:border-box}body,html{height:100%}body{margin:0;font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;background:var(--bg);color:var(--text);overflow:hidden}.muted{color:var(--muted);font-size:13px}.app-shell{max-width:1200px;height:100vh;margin:0 auto;padding:20px;display:flex;flex-direction:column;gap:16px}.topbar{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);gap:18px}.topbar-title{display:flex;align-items:center;gap:10px;font-weight:700;font-size:18px;white-space:nowrap}.status-dot{width:10px;height:10px;background:#3b82f6;border-radius:50%;box-shadow:0 0 0 4px rgba(59,130,246,.12)}.action-group{display:flex;flex:0 1 auto;min-width:0;margin-left:auto;justify-content:flex-end;flex-wrap:nowrap;gap:10px;overflow-x:auto;overflow-y:hidden;padding:0 0 2px 18px}.song-name{display:flex;align-items:center;gap:10px;min-width:0;width:100%}.song-name label{color:var(--muted);font-size:13px;font-weight:700;white-space:nowrap}.song-name .req{color:#ef4444;margin-left:4px}.song-name input{width:100%;border:1px solid var(--border);border-radius:10px;padding:10px 12px;outline:0;background:#fff;color:var(--text)}.song-name input:focus{border-color:var(--primary);box-shadow:0 0 0 4px rgba(45,109,250,.12)}.song-name input.is-invalid{border-color:#ef4444;box-shadow:0 0 0 4px rgba(239,68,68,.12)}.song-name-panel{margin:0 0 10px}.song-card{display:flex;align-items:center;justify-content:space-between;background:#f8fafc;border:1px solid var(--border);border-radius:12px;padding:12px;margin:0 0 12px}.song-card-label{color:var(--muted);font-size:12px;font-weight:800;white-space:nowrap}.song-card-value{flex:1;text-align:right;margin-left:12px;font-weight:800;color:var(--text);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.mobile-block{min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:24px;font-weight:800;color:var(--text)}.btn{border:none;border-radius:10px;padding:10px 14px;font-weight:600;cursor:pointer;transition:transform .15s ease,box-shadow .15s ease,background .2s ease;display:inline-flex;align-items:center;gap:8px;white-space:nowrap}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff;box-shadow:0 6px 16px rgba(45,109,250,.25)}.btn-primary:hover:not(:disabled){background:var(--primary-2);transform:translateY(-1px)}.btn-ghost{background:#eef2ff;color:var(--accent);border:1px solid #dbeafe}.btn-ghost:hover:not(:disabled){background:#e0e7ff}.btn-danger{background:#fee2e2;color:var(--danger);border:1px solid #fecaca}.btn-danger:hover:not(:disabled){background:#fecdd3}.btn-secondary{background:#e5e7eb;color:#374151}.layout{display:grid;grid-template-columns:360px 1fr;gap:16px;flex:1;min-height:0}.panel{background:var(--panel);border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column;min-height:0}.panel-header{padding:14px 18px;border-bottom:1px solid var(--border);font-weight:700;display:flex;align-items:center;justify-content:space-between}.panel-body{padding:16px 18px 20px;flex:1;min-height:0;overflow:auto}.upload-drop{border:1px dashed #cbd5e1;border-radius:12px;padding:14px;text-align:center;background:#f8fafc;cursor:pointer;transition:border .2s ease,background .2s ease}.upload-drop:hover{border-color:var(--primary);background:#f1f5f9}.upload-hint{color:var(--muted);font-size:13px;margin-top:8px}.audio-info{margin-top:10px;padding:10px;border-radius:10px;background:#ecf3ff;color:#1d4ed8;display:none}.audio-meta{display:flex;justify-content:space-between;font-size:13px;gap:12px}.timeline{margin-top:12px}input[type=range]{width:100%;accent-color:var(--primary)}.time-row{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-top:4px}.player-buttons{display:flex;align-items:center;gap:10px;margin:12px 0}.round-btn{width:40px;height:40px;border-radius:50%;border:1px solid var(--border);background:#fff;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;transition:background .2s ease,transform .1s ease}.round-btn:hover{background:#f3f4f6;transform:translateY(-1px)}.volume-row{display:flex;align-items:center;gap:10px;color:var(--muted);font-size:12px}.toggle-line{display:flex;align-items:center;gap:10px;margin:12px 0 4px}.switch{position:relative;width:44px;height:24px}.switch input{opacity:0;width:0;height:0}.slider{position:absolute;cursor:pointer;top:0;left:0;right:0;bottom:0;background:#d1d5db;transition:.2s;border-radius:999px}.slider:before{position:absolute;content:"";height:18px;width:18px;left:3px;bottom:3px;background:#fff;transition:.2s;border-radius:50%;box-shadow:0 1px 4px rgba(0,0,0,.2)}.switch input:checked+.slider{background:var(--primary)}.switch input:checked+.slider:before{transform:translateX(20px)}.shortcuts{margin-top:14px;padding:12px;background:#f8fafc;border:1px solid var(--border);border-radius:12px;color:var(--muted);font-size:12px;display:grid;gap:8px}.shortcut-row{display:flex;justify-content:space-between;align-items:center}.keycap{padding:4px 8px;border-radius:8px;background:#e0e7ff;color:#1d4ed8;font-weight:700;font-size:12px}.lyrics-panel{min-height:0}.lyrics-body{padding:0;display:flex;flex-direction:column;flex:1;min-height:0}.lyrics-toolbar{padding:14px 18px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;gap:10px;color:var(--muted);font-size:13px}.lyrics-scroll{flex:1;min-height:0;overflow-y:auto;background:#f8fafc}.lyrics-list{padding:16px 18px 20px}.lyrics-empty{text-align:center;color:#94a3b8;margin-top:120px}.lyrics-empty .icon{font-size:28px;margin-bottom:10px;opacity:.4}.lyric-line{background:#fff;border:1px solid var(--border);border-radius:10px;padding:12px;margin-bottom:10px;display:flex;align-items:center;gap:12px;box-shadow:0 4px 10px rgba(0,0,0,.03);cursor:pointer}.lyric-line:hover{border-color:var(--primary);box-shadow:0 6px 14px rgba(45,109,250,.08)}.lyric-line.selected{border-color:var(--primary);box-shadow:0 8px 18px rgba(45,109,250,.12)}.lyric-line.playing{border-color:#34d399;background:#ecfdf5}.lyric-line.playing .lyric-time{color:#059669}.lyric-time{width:72px;font-family:SFMono-Regular,monospace;color:var(--accent);font-weight:800}.lyric-text{flex:1;color:var(--text);overflow-wrap:anywhere}.lyric-actions{display:inline-flex;gap:8px}.lyric-actions button{border:1px solid var(--border);background:#fff;border-radius:8px;padding:6px 8px;cursor:pointer;color:#64748b;transition:background .15s ease,color .15s ease}.lyric-actions button:hover{background:#e0e7ff;color:var(--primary)}.hidden{display:none!important}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);border:0}.notification{position:fixed;top:24px;right:24px;background:#111827;color:#fff;padding:12px 16px;border-radius:10px;box-shadow:0 10px 25px rgba(0,0,0,.15);opacity:0;transform:translateY(-10px);transition:all .25s ease;z-index:9999}.notification-show{opacity:1;transform:translateY(0)}.notification-hide{opacity:0;transform:translateY(-10px)}.notification-success{background:linear-gradient(135deg,#10b981,#059669)}.notification-error{background:linear-gradient(135deg,#ef4444,#dc2626)}.notification-warning{background:linear-gradient(135deg,#f59e0b,#d97706)}.notification-info{background:linear-gradient(135deg,#3b82f6,#2563eb)}@media (max-width:992px){.topbar{flex-direction:column;align-items:stretch}.song-name{width:100%;min-width:0}.action-group{width:100%;justify-content:flex-start;overflow-x:auto}.layout{grid-template-columns:1fr}}