*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{color:#e0e0e0;background:#0f1117;height:100dvh;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;overflow:hidden}#root{flex-direction:column;height:100dvh;display:flex}button{cursor:pointer;background:0 0;border:none;font-family:inherit}input,textarea{font-family:inherit}.app{background:#0f1117;flex-direction:column;height:100dvh;display:flex}.app-header{background:#16172a;border-bottom:1px solid #2a2d4a;flex-shrink:0;align-items:center;gap:12px;padding:8px 20px;display:flex}.logo{letter-spacing:-.5px;font-size:20px;font-weight:700}.logo-ab{color:#4ade80}.logo-sheet{color:#e0e0e0}.tagline{color:#4b5563;flex:1;font-size:12px}.header-tabs{gap:4px;display:flex}.header-tab{color:#6b7280;border-radius:6px;align-items:center;gap:5px;padding:5px 12px;font-size:12px;transition:all .15s;display:flex}.header-tab:hover{color:#c0c4d8;background:#1e2035}.header-tab.active{color:#4ade80;background:#1e2035}.knowledge-badge{color:#0f1117;text-align:center;background:#4ade80;border-radius:10px;min-width:16px;padding:1px 5px;font-size:10px;font-weight:700}.app-body{flex:1;display:flex;overflow:hidden}.panel-left{border-right:1px solid #2a2d4a;flex:1;overflow:hidden}.panel-chat{flex-shrink:0;width:360px;overflow:hidden}.sheet-panel{background:#fff;flex-direction:column;height:100%;display:flex}.sheet-header{background:#f0f0f0;border-bottom:1px solid #c8c8c8;flex-wrap:wrap;flex-shrink:0;align-items:center;gap:10px;padding:6px 14px;display:flex}.sheet-title{color:#333;flex:1;min-width:100px;font-size:13px;font-weight:600}.compat-badge{border-radius:20px;padding:2px 8px;font-size:11px;font-weight:500}.compat-both{color:#155724;background:#d4edda}.compat-excel{color:#004085;background:#cce5ff}.compat-sheets{color:#0d6832;background:#d4edda}.sheet-copy-btn{color:#444;background:#e0e0e0;border:1px solid #bbb;border-radius:4px;padding:3px 10px;font-size:12px;transition:background .15s}.sheet-copy-btn:hover{background:#d0d0d0}.sheet-verify-btn{color:#856404;background:#fff3cd;border:1px solid #ffc107;border-radius:4px;padding:3px 10px;font-size:12px;transition:background .15s}.sheet-verify-btn:hover{background:#ffe69c}.verify-btn{color:#888;border-radius:4px;flex-shrink:0;padding:2px 5px;font-size:13px;transition:all .15s}.verify-btn:hover{color:#856404;background:#fff3cd}.formula-bar{background:#fff;border-bottom:1px solid #c8c8c8;flex-shrink:0;align-items:center;min-height:26px;display:flex}.formula-bar-cell{text-align:center;color:#333;background:#f5f5f5;border-right:1px solid #c8c8c8;flex-shrink:0;width:56px;padding:3px 6px;font-family:ui-monospace,monospace;font-size:12px}.formula-bar-fx{color:#888;background:#f5f5f5;border-right:1px solid #c8c8c8;flex-shrink:0;padding:3px 8px;font-size:12px;font-style:italic}.formula-bar-value{color:#222;white-space:nowrap;text-overflow:ellipsis;flex:1;padding:3px 8px;font-family:ui-monospace,monospace;font-size:13px;overflow:hidden}.formula-bar-value.is-formula{color:#1a5fb4}.sheet-grid-area{background:#fff;flex:1;overflow:auto}.sheet-empty{color:#aaa;flex-direction:column;justify-content:center;align-items:center;gap:14px;height:100%;display:flex}.sheet-empty-icon{opacity:.35;font-size:48px}.sheet-empty p{text-align:center;font-size:14px;line-height:1.7}.sheet-grid-wrapper{overflow:auto}.sheet-grid{border-collapse:collapse;background:#fff;min-width:100%;font-size:13px}.sheet-corner{z-index:3;background:#f0f0f0;border-bottom:1px solid #bbb;border-right:1px solid #bbb;width:40px;position:sticky;top:0;left:0}.sheet-col-header{color:#555;text-align:center;z-index:2;-webkit-user-select:none;user-select:none;background:#f0f0f0;border-bottom:1px solid #bbb;border-right:1px solid #c8c8c8;min-width:110px;padding:4px 8px;font-size:11px;font-weight:600;position:sticky;top:0}.sheet-row-header{color:#555;text-align:right;z-index:1;-webkit-user-select:none;user-select:none;background:#f0f0f0;border-bottom:1px solid #d8d8d8;border-right:1px solid #bbb;min-width:40px;padding:0 8px;font-size:11px;position:sticky;left:0}.sheet-cell{white-space:nowrap;vertical-align:middle;cursor:cell;color:#222;background:#fff;border-bottom:1px solid #d8d8d8;border-right:1px solid #d8d8d8;padding:4px 8px;position:relative}.sheet-cell:hover{background:#f5f8ff}.cell-header{color:#2d5a2d;background:#e8f0e8;border-bottom:1px solid #bbb;font-size:12px;font-weight:700}.cell-highlight{color:#1a6b1a;background:#e8f5e8}.cell-has-formula{cursor:pointer}.cell-has-formula:hover,.cell-showing-formula{background:#f0f4ff}.formula-overlay{z-index:10;white-space:nowrap;background:#e8f0fe;border:1.5px solid #1a73e8;align-items:center;gap:4px;min-width:100%;height:100%;padding:0 6px;display:flex;position:absolute;top:0;left:0;box-shadow:2px 2px 6px #0000001f}.cell-selected{outline-offset:-2px;outline:2px solid #1a73e8;background:#e8f0fe!important}.cell-value{flex:1}.formula-text{color:#1a5fb4;white-space:nowrap;flex:1;font-family:ui-monospace,monospace;font-size:11.5px}.pin-btn{color:#888;flex-shrink:0;padding:0 2px;font-size:13px;transition:color .15s}.pin-btn:hover,.pin-btn.pinned{color:#1a73e8}.formula-list{background:#f8f8f8;border-top:1px solid #c8c8c8;flex-direction:column;flex-shrink:0;gap:5px;padding:8px 14px;display:flex}.formula-row{align-items:center;gap:8px;display:flex}.formula-label{color:#888;flex-shrink:0;min-width:52px;font-size:11px}.formula-code{color:#1a5fb4;white-space:nowrap;background:#fff;border:1px solid #d0d0d0;border-radius:3px;flex:1;padding:3px 8px;font-family:ui-monospace,monospace;font-size:12px;overflow-x:auto}.sheet-tabs{background:#e8e8e8;border-top:1px solid #c8c8c8;flex-shrink:0;padding:0 8px;display:flex}.sheet-tab{color:#666;background:#d8d8d8;border-top:2px solid #0000;border-left:1px solid #0000;border-right:1px solid #0000;border-radius:3px 3px 0 0;margin-top:-1px;margin-right:3px;padding:5px 18px;font-size:12px;transition:all .15s}.sheet-tab:hover{color:#333;background:#e8e8e8}.sheet-tab.active{color:#1a5fb4;background:#fff;border-top-color:#1a73e8;border-left-color:#c8c8c8;border-right-color:#c8c8c8;font-weight:600}.copy-btn{color:#888;border-radius:3px;flex-shrink:0;padding:2px 5px;font-size:13px;transition:all .15s}.copy-btn:hover{color:#333;background:#e0e0e0}.knowledge-panel{background:#0f1117;flex-direction:column;gap:20px;height:100%;padding:14px;display:flex;overflow-y:auto}.knowledge-empty{color:#4b5563;text-align:center;flex-direction:column;justify-content:center;align-items:center;height:100%;font-size:14px;line-height:1.7;display:flex}.knowledge-heading{color:#6b7280;text-transform:uppercase;letter-spacing:.08em;margin-bottom:10px;font-size:12px;font-weight:600}.rank-list{flex-direction:column;gap:6px;display:flex}.rank-item{background:#16172a;border:1px solid #2a2d4a;border-radius:8px;align-items:center;gap:10px;padding:8px 12px;display:flex}.rank-num{color:#6b7280;min-width:18px;font-size:13px;font-weight:700}.rank-fn{color:#c0c4d8;flex:1;font-family:ui-monospace,monospace;font-size:14px;font-weight:600}.rank-count{color:#6b7280;font-size:12px}.rank-badge{border-radius:4px;padding:2px 6px;font-size:11px}.rank-hard .rank-badge{color:#f87171;background:#3f1010}.rank-medium .rank-badge{color:#fbbf24;background:#3f2d0a}.rank-easy .rank-badge{color:#4ade80;background:#0d2a0d}.history-list{flex-direction:column;gap:6px;display:flex}.history-item{cursor:pointer;background:#16172a;border:1px solid #2a2d4a;border-radius:8px;padding:10px 12px;transition:all .15s}.history-item:hover{background:#1e2035;border-color:#4ade80}.history-fn{color:#60a5fa;margin-bottom:3px;font-family:ui-monospace,monospace;font-size:13px;font-weight:700}.history-question{color:#9ca3af;margin-bottom:4px;font-size:12px}.history-date{color:#4b5563;font-size:11px}.chat-panel{background:#12131f;flex-direction:column;height:100%;display:flex}.chat-messages{flex-direction:column;flex:1;gap:12px;padding:14px;display:flex;overflow-y:auto}.chat-bubble{align-items:flex-start;gap:8px;display:flex}.chat-bubble.user{flex-direction:row-reverse}.chat-content{flex-direction:column;gap:5px;max-width:250px;display:flex}.chat-bubble.user .chat-content{align-items:flex-end}.chat-avatar{background:#1e2035;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:14px;display:flex}.user-avatar{background:#1a2a3a}.chat-text{color:#c0c4d8;word-break:break-word;background:#1e2035;border-radius:12px;padding:8px 12px;font-size:13px;line-height:1.6}.chat-bubble.user .chat-text{color:#e0f0e8;background:#1a3a2a;border-radius:12px 12px 4px}.chat-bubble.assistant .chat-text{border-radius:12px 12px 12px 4px}.example-btn{color:#60a5fa;background:#1a2a3a;border:1px solid #2a3a5a;border-radius:6px;align-self:flex-start;padding:5px 10px;font-size:12px;transition:all .15s}.example-btn:hover{background:#1e3a4a;border-color:#4a8aaa}.knowledge-hint-btn{color:#fbbf24;text-align:left;background:#2a1f0a;border:1px solid #3a2f0a;border-radius:6px;align-self:flex-start;padding:5px 10px;font-size:12px;transition:all .15s}.knowledge-hint-btn:hover{background:#3a2f0a;border-color:#fbbf24}.chat-text.loading{gap:4px;padding:12px 16px;display:flex}.chat-text.loading span{background:#4b5563;border-radius:50%;width:6px;height:6px;animation:1.2s infinite dot-bounce}.chat-text.loading span:nth-child(2){animation-delay:.2s}.chat-text.loading span:nth-child(3){animation-delay:.4s}@keyframes dot-bounce{0%,80%,to{transform:translateY(0)}40%{background:#4ade80;transform:translateY(-6px)}}.suggestions{scrollbar-width:thin;scrollbar-color:transparent transparent;flex-direction:column;gap:5px;max-height:200px;padding:0 14px 10px;display:flex;overflow-y:scroll}.suggestions::-webkit-scrollbar{width:5px}.suggestions::-webkit-scrollbar-track{background:#1e2035;border-radius:3px}.suggestions::-webkit-scrollbar-thumb{background:0 0;border-radius:3px;transition:background .15s}.suggestions.hovered::-webkit-scrollbar-thumb{background:#4a4d6a}.suggestions.hovered{scrollbar-color:#4a4d6a #1e2035}.suggestions.hovered::-webkit-scrollbar-thumb:hover{background:#4ade80}.suggestion-chip{color:#9ca3af;text-align:left;background:#1e2035;border:1px solid #2a2d4a;border-radius:8px;padding:6px 10px;font-size:12px;transition:all .15s}.suggestion-chip:hover{color:#c0c4d8;background:#2a2d4a;border-color:#3a3d5a}.chat-input-area{background:#12131f;border-top:1px solid #2a2d4a;flex-shrink:0;gap:8px;padding:12px;display:flex}.chat-input{color:#e0e0e0;resize:none;background:#1e2035;border:1px solid #2a2d4a;border-radius:8px;outline:none;flex:1;padding:8px 10px;font-size:13px;transition:border-color .15s}.chat-input:focus{border-color:#4ade80}.chat-input::placeholder{color:#4b5563}.send-btn{color:#0f1117;background:#4ade80;border-radius:8px;align-self:flex-end;padding:8px 14px;font-size:13px;font-weight:600;transition:all .15s}.send-btn:hover:not(:disabled){background:#22c55e}.send-btn:disabled{color:#4b5563;cursor:not-allowed;background:#1e2035}