:root{--fg: #000000;--bg: #ffffff;--bg2: #f5f5f5;--bg3: #e8e8e8;--border: #d0d0d0;--accent: #4CAF50;--accent-hover: #43A047;--danger: #e53935;--text-muted: #888888;--keyboard-bg: #1a1a1a;--key-bg1: #3a3a3a;--key-bg2: #2a2a2a;--key-text: #ffffff;--radius: 6px;--shadow: 0 1px 3px rgba(0,0,0,.08)}[data-theme=dark]{--fg: #ffffff;--bg: #0a0a0a;--bg2: #1a1a1a;--bg3: #2a2a2a;--border: #3a3a3a;--text-muted: #666666;--shadow: 0 1px 3px rgba(0,0,0,.3)}*{margin:0;padding:0;box-sizing:border-box}body{font-family:Inter,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg);color:var(--fg);-webkit-font-smoothing:antialiased;min-height:100vh;overflow:hidden}.app-container{height:100vh;display:flex;flex-direction:column;overflow:hidden}.app-header{display:flex;align-items:center;padding:10px 20px;border-bottom:1px solid var(--border);background:var(--bg);gap:12px;flex-shrink:0;z-index:10}.app-title{font-size:15px;font-weight:700;letter-spacing:-.02em;white-space:nowrap}.app-nav{display:flex;gap:4px;margin-left:auto}.nav-btn{padding:5px 14px;border:1px solid var(--border);border-radius:var(--radius);background:transparent;color:var(--fg);font-size:13px;font-weight:500;cursor:pointer;transition:all .15s;font-family:inherit}.nav-btn:hover{background:var(--bg2)}.nav-btn.active{background:var(--fg);color:var(--bg);border-color:var(--fg)}.app-main{flex:1;overflow:hidden}.theme-toggle{width:34px;height:34px;border:1px solid var(--border);border-radius:var(--radius);background:transparent;color:var(--fg);font-size:16px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s;flex-shrink:0}.theme-toggle:hover{background:var(--bg2)}.btn{padding:7px 14px;border:1px solid var(--border);border-radius:var(--radius);background:transparent;color:var(--fg);font-size:13px;font-weight:500;font-family:inherit;cursor:pointer;transition:all .15s;white-space:nowrap}.btn:hover{background:var(--bg3);border-color:var(--fg)}.btn-primary{background:var(--fg);color:var(--bg);border-color:var(--fg)}.btn-primary:hover{opacity:.8;background:var(--fg)}.btn-danger{color:var(--danger);border-color:var(--danger)}.btn-danger:hover{background:var(--danger);color:#fff}.btn-sm{padding:4px 10px;font-size:12px}.chart-editor{display:flex;flex-direction:column;height:calc(100vh - 50px);position:relative}.editor-toolbar{display:flex;gap:8px;padding:10px 20px;border-bottom:1px solid var(--border);flex-shrink:0}.editor-main{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:flex-start;padding:24px 16px 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0}.floating-keyboard.kb-float{border-radius:10px;width:420px}.floating-keyboard.minimized{width:auto;min-width:200px}.floating-keyboard.minimized.kb-anchor-bc{width:auto}.kb-titlebar{display:flex;align-items:center;justify-content:space-between;padding:6px 10px;background:#ffffff0d;border-bottom:1px solid rgba(255,255,255,.08);user-select:none;-webkit-user-select:none}.kb-titlebar-left{display:flex;align-items:center;gap:8px}.kb-grip{color:#666;font-size:14px}.kb-title-label{color:#aaa;font-size:12px;font-weight:600;letter-spacing:.02em}.kb-titlebar-actions{display:flex;align-items:center;gap:4px}.kb-anchor-btn{width:26px;height:22px;border:none;border-radius:4px;background:transparent;color:#666;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all 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.15s}.library-card:hover{border-color:var(--accent)}.library-card.trashed{opacity:.7;border-style:dashed}.card-preview{overflow:hidden;border-radius:4px;display:flex;align-items:center;justify-content:center;position:relative}.library-tabs{display:flex;gap:2px;margin-bottom:16px;border-bottom:2px solid var(--border)}.lib-tab{padding:8px 18px;border:none;background:transparent;color:var(--text-muted);font-size:13px;font-weight:600;font-family:inherit;cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-2px;transition:all .15s;display:flex;align-items:center;gap:6px}.lib-tab:hover{color:var(--fg)}.lib-tab.active{color:var(--fg);border-bottom-color:var(--accent)}.tab-count{font-size:11px;font-weight:700;background:var(--bg3);color:var(--text-muted);padding:1px 6px;border-radius:10px}.lib-tab.active 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8px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.04em}.lesson-grid{grid-template-columns:repeat(auto-fill,minmax(240px,1fr))!important}.lesson-card{text-align:left;align-items:stretch!important}.lesson-card-header{display:flex;align-items:baseline;justify-content:space-between;gap:8px}.lesson-card-title{font-size:14px;font-weight:700;color:var(--fg)}.lesson-card-meta{font-size:11px;color:var(--text-muted);white-space:nowrap}.lesson-card.active-sheet{border-color:var(--accent);box-shadow:0 0 0 1px var(--accent)}.lesson-mini-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:2px;margin:8px 0}.mini-slot{aspect-ratio:1;border:1px solid var(--border);border-radius:2px;background:var(--bg2)}.mini-slot.filled{background:var(--accent);border-color:var(--accent);opacity:.6}.card-actions{display:flex;gap:6px;flex-wrap:wrap;justify-content:center}.added-indicator{position:absolute;top:8px;right:8px;z-index:5;animation:fadeInCheck .3s ease-out}@keyframes 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transparent;border-radius:3px;cursor:pointer;color:var(--fg)}.sheet-title-field:hover{border-color:var(--border)}.sheet-title-field.active{border-color:var(--accent)}.sheet-grid{display:grid;grid-template-columns:repeat(4,1fr);grid-template-rows:repeat(4,1fr);gap:0px;flex:1}.sheet-slot{border:1px dashed var(--border);border-radius:3px;display:flex;align-items:center;justify-content:center;position:relative;min-height:0;transition:border-color .15s;overflow:hidden}.sheet-slot.dragging{opacity:.4}.sheet-slot:hover{border-color:var(--accent)}.sheet-slot.drag-over{border-color:var(--fg)}.drag-indicator-bar{position:absolute;top:0;left:0;right:0;height:3px;background:var(--fg);z-index:10;animation:slideIn .15s ease-out}@keyframes slideIn{0%{transform:scaleX(0)}to{transform:scaleX(1)}}.slot-chart{position:relative;display:flex;align-items:center;justify-content:center;width:100%;height:100%}.slot-chart svg{width:100%;height:100%}.slot-placeholder{display:flex;align-items:center;justify-content:center;width:100%;height:100%;opacity:1}.slot-placeholder svg{width:100%;height:100%}.slot-remove{position:absolute;top:2px;right:2px;width:20px;height:20px;border-radius:50%;border:1px solid var(--border);background:var(--bg);color:var(--danger);font-size:13px;cursor:pointer;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .15s;line-height:1;z-index:5}.slot-chart:hover .slot-remove{opacity:1}.sheet-note{background:#4caf5014;border:1px solid var(--accent);border-radius:4px;padding:5px 10px;font-size:12px;cursor:move;display:inline-flex;align-items:center;gap:6px;max-width:250px;z-index:5}.sheet-note.active{border-width:2px;box-shadow:0 0 0 2px #4caf5033}.note-text{flex:1;min-width:60px}.note-delete{width:16px;height:16px;border:none;background:transparent;color:var(--danger);font-size:13px;cursor:pointer;padding:0;display:flex;align-items:center;justify-content:center;opacity:0;transition:opacity .15s}.sheet-note:hover .note-delete{opacity:1}.sheet-footer{text-align:center;font-size:10px;font-weight:700;letter-spacing:.06em;color:var(--fg);padding-top:8px;margin-top:auto}.dialog-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000}.dialog-box{background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:24px 28px;max-width:400px;width:90%;box-shadow:0 8px 32px #0003}.dialog-title{font-size:16px;font-weight:700;margin-bottom:8px}.dialog-text{font-size:13px;color:var(--text-muted);margin-bottom:16px}.dialog-actions{display:flex;gap:8px;flex-wrap:wrap}.quick-look-popup{background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:16px;max-width:420px;width:90%;box-shadow:0 8px 32px #0003}.quick-look-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.quick-look-header h3{font-size:16px;font-weight:700}.quick-look-body{display:flex;justify-content:center;margin-bottom:12px}.quick-look-actions{display:flex;gap:8px;justify-content:center}.chart-picker-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#0006;display:flex;align-items:center;justify-content:center;z-index:1000}.chart-picker{background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:16px;max-width:700px;width:90%;max-height:80vh;overflow-y:auto;box-shadow:0 8px 32px #0003}.chart-picker-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}.chart-picker-header h3{font-size:15px;font-weight:700}.chart-picker-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:10px}.chart-picker-item{border:1px solid var(--border);border-radius:var(--radius);padding:6px;cursor:pointer;display:flex;flex-direction:column;align-items:center;gap:4px;transition:border-color .15s}.chart-picker-item:hover{border-color:var(--accent)}.chart-picker-item .picker-title{font-size:11px;font-weight:600;text-align:center;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%}.save-options-dialog{background:var(--bg);border:1px solid var(--border);border-radius:10px;padding:24px;max-width:360px;width:90%;box-shadow:0 8px 32px #0003}.save-options-dialog h3{font-size:15px;font-weight:700;margin-bottom:12px}.save-option-btn{width:100%;padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius);background:transparent;color:var(--fg);font-size:13px;font-weight:500;font-family:inherit;cursor:pointer;text-align:left;margin-bottom:8px;transition:all .15s}.save-option-btn:hover{border-color:var(--accent);background:var(--bg2)}.save-option-btn strong{display:block;font-size:14px;margin-bottom:2px}.save-option-btn span{font-size:11px;color:var(--text-muted)}.title-case-toggle{display:flex;gap:2px;margin-left:8px}.case-btn{padding:4px 8px;border:1px solid var(--border);border-radius:3px;background:transparent;color:var(--text-muted);font-size:10px;font-weight:600;font-family:inherit;cursor:pointer;transition:all .15s}.case-btn:hover{border-color:var(--fg);color:var(--fg)}.case-btn.active{background:var(--fg);color:var(--bg);border-color:var(--fg)}.slot-add-btn{width:100%;height:100%;border:none;background:transparent;color:var(--text-muted);font-size:28px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .15s}.slot-add-btn:hover{color:var(--accent)}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}@media(max-width:768px){.app-header{padding:8px 12px;flex-wrap:wrap}.app-title{font-size:13px}.floating-keyboard.kb-anchor-bc,.floating-keyboard.kb-anchor-bl,.floating-keyboard.kb-anchor-br{width:calc(100vw - 16px);left:8px;transform:none}.music-key{min-width:26px;height:30px;font-size:12px}.music-key.wide{min-width:34px;font-size:10px}.library-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr))}}