:root{--primary: #4f46e5;--primary-light: #6366f1;--primary-dark: #3730a3;--bg: #f8fafc;--card: #ffffff;--border: #e2e8f0;--text: #1e293b;--text-secondary: #64748b;--danger: #ef4444;--success: #22c55e;--radius: 12px;--radius-sm: 8px;--shadow: 0 1px 3px rgba(0, 0, 0, .08), 0 1px 2px rgba(0, 0, 0, .06);--shadow-md: 0 4px 6px rgba(0, 0, 0, .07), 0 2px 4px rgba(0, 0, 0, .06)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg);color:var(--text);min-height:100vh;min-height:100dvh;-webkit-tap-highlight-color:transparent;user-select:none;-webkit-user-select:none}#app{max-width:480px;margin:0 auto;padding:16px;min-height:100vh;min-height:100dvh}.header{display:flex;align-items:center;gap:12px;margin-bottom:20px;padding-bottom:16px;border-bottom:1px solid var(--border)}.header h1{font-size:20px;font-weight:700}.btn{display:inline-flex;align-items:center;justify-content:center;padding:8px 16px;border-radius:var(--radius-sm);border:1px solid var(--border);background:var(--card);color:var(--text);font-size:14px;font-weight:500;cursor:pointer;transition:all .15s;min-height:36px;white-space:nowrap}.btn:hover{background:var(--bg)}.btn:active{transform:scale(.97)}.btn-primary{background:var(--primary);color:#fff;border-color:var(--primary)}.btn-primary:hover{background:var(--primary-light)}.btn-large{padding:12px 24px;font-size:16px;min-height:44px}.icon-btn{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--card);cursor:pointer;font-size:14px;color:var(--text-secondary);transition:all .15s}.icon-btn:hover{background:var(--bg);color:var(--text)}.song-list{display:flex;flex-direction:column;gap:8px}.song-item{display:flex;align-items:center;justify-content:space-between;padding:14px 16px;background:var(--card);border-radius:var(--radius);border:1px solid var(--border);cursor:pointer;transition:all .15s;box-shadow:var(--shadow)}.song-item:hover{border-color:var(--primary-light);box-shadow:var(--shadow-md)}.song-item:active{transform:scale(.98)}.song-info{display:flex;flex-direction:column;gap:4px;flex:1;min-width:0}.song-name{font-weight:600;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.song-meta{font-size:12px;color:var(--text-secondary)}.song-delete{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border:none;background:none;cursor:pointer;font-size:18px;color:var(--text-secondary);border-radius:var(--radius-sm);transition:all .15s;flex-shrink:0;margin-left:8px}.song-delete:hover{background:#fef2f2;color:var(--danger)}.empty-state{text-align:center;padding:48px 20px;color:var(--text-secondary)}.empty-state .empty-icon{font-size:48px;margin-bottom:12px}.empty-state p{font-size:14px;margin-bottom:8px}.empty-state .empty-hint{font-size:12px;color:#94a3b8}.upload-section{padding:0 16px;margin-bottom:16px}.upload-buttons{display:flex;gap:12px}.upload-btn{flex:1;padding:16px 12px;color:#fff;text-align:center;border-radius:12px;cursor:pointer;font-size:16px;font-weight:500;min-height:52px;border:none;transition:background .2s}.upload-btn-local{background:#1989fa}.upload-btn-local:hover{background:#1678de}.upload-btn-camera{background:#07c160}.upload-btn-camera:hover{background:#06ad56}.upload-btn-manual{background:#ff9500}.upload-btn-manual:hover{background:#e68600}.upload-btn.disabled{opacity:.5;cursor:not-allowed;background:#ccc}.upload-btn.disabled:hover{background:#ccc}.song-count{text-align:center;margin-top:12px;font-size:12px;color:var(--text-secondary)}.progress-container{margin-top:16px;display:none;flex-direction:column;align-items:center;gap:8px}.progress-bar{width:100%;height:6px;background:var(--border);border-radius:3px;overflow:hidden}.progress-fill{height:100%;background:var(--primary);border-radius:3px;width:0%;transition:width .3s}.progress-tip{font-size:12px;color:var(--text-secondary)}.song-page{display:flex;flex-direction:column;min-height:0;gap:0}.song-main{display:flex;flex-direction:column;flex-shrink:0}.song-header-v2{display:flex;align-items:center;gap:8px;padding:4px 0 10px;border-bottom:1px solid var(--border);margin-bottom:8px}.back-btn-v2{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border:none;background:none;cursor:pointer;font-size:20px;color:var(--text-secondary);border-radius:var(--radius-sm);transition:all .15s;flex-shrink:0}.back-btn-v2:hover{background:var(--bg)}.back-btn-v2:active{background:var(--border)}.song-title-v2{flex:1;font-size:16px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chord-count-badge{font-size:11px;padding:3px 8px;background:var(--bg);border-radius:20px;color:var(--text-secondary);white-space:nowrap;border:1px solid var(--border)}.next-song-btn{display:inline-flex;align-items:center;justify-content:center;width:36px;height:36px;border:1px solid var(--border);background:var(--bg);cursor:pointer;font-size:18px;color:var(--text-secondary);border-radius:var(--radius-sm);transition:all .15s;flex-shrink:0}.next-song-btn:hover{background:var(--border);color:var(--text)}.next-song-btn:active{transform:scale(.93);background:var(--primary-light);color:#fff}.song-image-area{position:relative;max-height:60vh;max-height:60dvh;overflow:hidden;border-radius:var(--radius);background:var(--card);border:1px solid var(--border);box-shadow:var(--shadow);margin-bottom:8px}.song-image{width:100%;height:auto;max-height:60vh;max-height:60dvh;object-fit:contain;display:block}.image-with-overlay{position:relative;max-height:60vh;max-height:60dvh;overflow:hidden}.image-with-overlay .song-image{max-height:60vh;max-height:60dvh}.chord-overlay{position:absolute;bottom:0;left:0;right:0;display:flex;flex-wrap:wrap;gap:4px;padding:10px 12px;background:linear-gradient(transparent,#ffffffeb 20%,#fffffff2);justify-content:center;max-height:50%;overflow-y:auto}.chord-card-overlay{display:inline-flex;align-items:center;justify-content:center;min-width:44px;height:36px;padding:0 10px;background:#ffffffbf;border:1px solid var(--border);border-radius:18px;cursor:pointer;font-size:14px;font-weight:600;transition:all .15s;backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}.chord-card-overlay:hover{background:#4f46e51f;border-color:var(--primary-light)}.chord-card-overlay:active{transform:scale(.95)}.chord-card-overlay.active{background:var(--primary);color:#fff;border-color:var(--primary)}.chord-grid-display{display:flex;flex-wrap:wrap;gap:8px;padding:16px;min-height:180px;align-content:flex-start;justify-content:center}.chord-card{display:inline-flex;align-items:center;justify-content:center;width:72px;height:72px;background:var(--bg);border:2px solid var(--border);border-radius:var(--radius);cursor:pointer;transition:all .15s;font-size:18px;font-weight:700}.chord-card:hover{border-color:var(--primary-light);box-shadow:var(--shadow)}.chord-card:active{transform:scale(.95)}.chord-card.active{background:var(--primary);color:#fff;border-color:var(--primary);box-shadow:0 0 0 3px #4f46e533}.chord-card-name{pointer-events:none}.chord-grid-empty{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px;text-align:center;color:var(--text-secondary);gap:6px;min-height:180px}.chord-grid-empty .empty-icon{font-size:40px;margin-bottom:4px}.chord-grid-empty .empty-hint{font-size:12px;color:#94a3b8;margin-top:4px}.song-controls-panel{display:flex;flex-direction:column;gap:6px;background:var(--card);border-radius:var(--radius);border:1px solid var(--border);padding:10px;margin-bottom:8px;box-shadow:var(--shadow)}.bpm-row{display:flex;align-items:center;justify-content:center;gap:4px;flex-wrap:wrap}.bpm-btn{display:inline-flex;align-items:center;justify-content:center;width:40px;height:40px;border:1px solid var(--border);background:var(--bg);border-radius:var(--radius-sm);font-size:20px;font-weight:600;cursor:pointer;color:var(--text);touch-action:none;-webkit-tap-highlight-color:transparent;user-select:none;-webkit-user-select:none}.bpm-btn:hover{background:var(--border)}.bpm-btn:active{background:var(--primary-light);color:#fff}.bpm-display{display:inline-flex;align-items:center;justify-content:center;min-width:44px;font-size:18px;font-weight:700;color:var(--primary);font-variant-numeric:tabular-nums}.bpm-label{font-size:12px;color:var(--text-secondary);margin-right:4px}.bpm-presets{display:flex;gap:4px;margin-left:6px}.bpm-preset-btn{padding:5px 10px;border:1px solid var(--border);background:var(--bg);border-radius:20px;font-size:12px;font-weight:500;cursor:pointer;color:var(--text-secondary);transition:all .15s;white-space:nowrap}.bpm-preset-btn:hover{border-color:var(--primary-light);color:var(--text)}.bpm-preset-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}.transport-row-v2{display:flex;align-items:center;justify-content:center;gap:8px;padding:4px 0}.current-chord-display{min-width:48px;text-align:center;font-size:24px;font-weight:800;color:var(--primary);padding:0 8px}.transport-btn{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;border:1px solid var(--border);border-radius:50%;background:var(--card);cursor:pointer;font-size:20px;transition:all .15s;color:var(--text);box-shadow:var(--shadow)}.transport-btn:hover{box-shadow:var(--shadow-md)}.transport-btn:active{transform:scale(.93);background:var(--bg)}.play-btn-v2{width:56px;height:56px;background:var(--primary);color:#fff;font-size:22px;border-color:var(--primary);padding-left:3px}.play-btn-v2:hover{background:var(--primary-light)}.mode-row-v2{display:flex;gap:4px;justify-content:center}.mode-btn-v2{flex:1;max-width:80px;padding:5px 0;border:1px solid var(--border);background:var(--bg);border-radius:var(--radius-sm);font-size:12px;font-weight:500;cursor:pointer;color:var(--text-secondary);transition:all .15s;text-align:center}.mode-btn-v2:hover{border-color:var(--primary-light)}.mode-btn-v2.active{background:var(--primary);color:#fff;border-color:var(--primary)}.instant-row-v2{display:flex;align-items:center;justify-content:center;gap:8px;font-size:12px;color:var(--text-secondary);padding-top:2px}.toggle-switch{position:relative;display:inline-block;width:40px;height:22px}.toggle-switch input{opacity:0;width:0;height:0}.toggle-slider{position:absolute;cursor:pointer;top:0;left:0;right:0;bottom:0;background:var(--border);border-radius:22px;transition:.2s}.toggle-slider:before{content:"";position:absolute;width:18px;height:18px;left:2px;top:2px;background:#fff;border-radius:50%;transition:.2s}.toggle-switch input:checked+.toggle-slider{background:var(--primary)}.toggle-switch input:checked+.toggle-slider:before{transform:translate(18px)}.song-chords-panel{display:flex;flex-direction:column;flex:1;min-height:0}.chord-list-header-v2{display:flex;align-items:center;justify-content:space-between;padding:8px 0 6px;font-size:13px;color:var(--text-secondary);border-bottom:1px solid var(--border)}.chord-count{font-weight:600;color:var(--text)}.continuous-add-trigger{padding:4px 10px;border:1px solid var(--primary-light);background:#4f46e50f;color:var(--primary);border-radius:20px;font-size:12px;font-weight:500;cursor:pointer;transition:all .15s}.continuous-add-trigger:hover{background:#4f46e51f}.continuous-add-trigger:active{transform:scale(.95)}.chord-list-scroll{overflow-y:auto;-webkit-overflow-scrolling:touch;padding:4px 0}.chord-item{display:flex;align-items:center;gap:8px;padding:10px 12px;background:var(--bg);border-radius:var(--radius-sm);margin-bottom:6px;cursor:pointer;border:1px solid transparent;transition:all .15s}.chord-item:hover{background:var(--card);border-color:var(--border)}.chord-item.active{background:#4f46e514;border-color:var(--primary-light)}.chord-item .chord-info{display:flex;align-items:center;gap:8px;flex:1;min-width:0}.chord-item .chord{font-weight:700;font-size:16px;color:var(--primary);min-width:40px;text-align:center}.chord-item.active .chord{color:var(--primary-dark)}.chord-item .edit-input{width:70px;padding:4px 8px;border:2px solid var(--primary);border-radius:var(--radius-sm);font-size:14px;font-weight:600;text-align:center;outline:none}.chord-item .lyric{font-size:13px;color:var(--text-secondary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.chord-item .chord-actions{display:flex;gap:2px;flex-shrink:0}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#0006;display:flex;align-items:center;justify-content:center;z-index:100;padding:16px}.chord-picker-modal{background:var(--card);border-radius:var(--radius);padding:20px;width:100%;max-width:380px;max-height:90vh;max-height:90dvh;overflow-y:auto;box-shadow:0 20px 40px #00000026}.chord-picker-modal h3,.continuous-add-modal h3{font-size:16px;margin-bottom:16px;text-align:center}.chord-category{font-size:12px;font-weight:600;color:var(--text-secondary);margin:12px 0 6px;text-transform:uppercase;letter-spacing:.5px}.chord-grid{display:flex;flex-wrap:wrap;gap:6px}.chord-option-btn{padding:8px 12px;border:1px solid var(--border);background:var(--bg);border-radius:var(--radius-sm);font-size:14px;font-weight:600;cursor:pointer;transition:all .15s;min-width:40px;text-align:center}.chord-option-btn:hover{border-color:var(--primary-light);background:#4f46e50f}.chord-option-btn:active{background:var(--primary);color:#fff}.manual-add-row{display:flex;gap:8px;margin:8px 0}.manual-chord-input{flex:1;padding:8px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:14px;outline:none;min-width:0}.manual-chord-input:focus{border-color:var(--primary)}.cancel-picker-btn{width:100%;margin-top:12px}.continuous-add-modal{background:var(--card);border-radius:var(--radius);padding:20px;width:100%;max-width:400px;max-height:90vh;max-height:90dvh;overflow-y:auto;box-shadow:0 20px 40px #00000026}.continuous-add-chips{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:12px;min-height:36px}.chord-chip{display:inline-flex;align-items:center;gap:4px;padding:6px 12px;background:#4f46e514;color:var(--primary);border-radius:20px;font-size:13px;font-weight:600;cursor:pointer}.chord-chip:hover{background:#ef44441a;color:var(--danger)}.chip-remove{font-size:16px;color:var(--text-secondary)}.continuous-add-input-row{margin-bottom:12px}.continuous-add-input{width:100%;padding:8px 12px;border:1px solid var(--border);border-radius:var(--radius-sm);font-size:14px;outline:none}.continuous-add-input:focus{border-color:var(--primary)}.continuous-add-actions{display:flex;gap:8px;margin-top:16px}.continuous-add-actions .btn,.cancel-continuous-btn{flex:1}.clear-continuous-btn{flex:.65;background:#fff5f5;color:#e53e3e;border-color:#fed7d7;font-size:13px}.clear-continuous-btn:hover{background:#fed7d7}@media(min-width:768px){#app{max-width:960px}.song-page{flex-direction:row;height:calc(100vh - 100px);height:calc(100dvh - 100px);gap:12px;min-height:500px}.song-main{width:45%;flex-shrink:0;overflow-y:auto}.song-image-area{max-height:none;flex:1;overflow-y:auto}.song-image{max-height:none;width:100%}.chord-grid-display{height:100%;align-content:flex-start}.song-controls-panel{flex-shrink:0}.song-chords-panel{flex:1;min-width:0;border-left:1px solid var(--border);padding-left:12px;display:flex;flex-direction:column}.chord-list-scroll{flex:1;overflow-y:auto}}@media(max-width:900px)and (orientation:landscape){#app{max-width:100%;padding:8px}.song-page{flex-direction:row;height:calc(100vh - 40px);height:calc(100dvh - 40px);gap:8px}.song-main{width:42%;flex-shrink:0;overflow-y:auto}.song-header-v2{padding:2px 0 6px;margin-bottom:4px}.song-image-area{max-height:none;flex:1;overflow-y:auto;margin-bottom:4px}.song-image{max-height:none}.chord-grid-display{min-height:120px}.chord-card{width:56px;height:56px;font-size:15px}.song-controls-panel{padding:6px;gap:4px;margin-bottom:4px}.bpm-btn{width:34px;height:34px;font-size:18px}.bpm-preset-btn{padding:4px 8px;font-size:11px}.transport-btn{width:40px;height:40px;font-size:16px}.play-btn-v2{width:48px;height:48px;font-size:18px}.song-chords-panel{flex:1;min-width:0;border-left:1px solid var(--border);padding-left:8px;display:flex;flex-direction:column}.chord-list-header-v2{padding:4px 0}.chord-list-scroll{flex:1;overflow-y:auto}}.tip{font-size:13px;color:var(--text-secondary);text-align:center;margin:8px 0}