:root{--bg-base: #f8f9fa;--bg-surface: #ffffff;--bg-raised: #ffffff;--bg-overlay: rgba(255, 255, 255, .9);--glass-bg: #ffffff;--glass-border: #000000;--glass-hover: #f1f5f9;--grad-brand: #FFD600;--grad-brand-soft: #FFFDE7;--text-primary: #000000;--text-secondary: #000000;--text-muted: #4b5563;--text-accent: #000000;--accent-purple: #8b5cf6;--accent-cyan: #0ea5e9;--accent-amber: #f59e0b;--accent-green: #10b981;--accent-red: #ef4444;--accent-blue: #3b82f6;--space-xs: 4px;--space-sm: 8px;--space-md: 12px;--space-lg: 16px;--space-xl: 24px;--space-2xl: 32px;--radius-sm: 0px;--radius-md: 0px;--radius-lg: 0px;--radius-xl: 0px;--radius-full: 0px;--shadow-sm: 2px 2px 0px #000;--shadow-md: 4px 4px 0px #000;--shadow-lg: 6px 6px 0px #000;--shadow-glow-purple: 6px 6px 0px #000;--shadow-glow-cyan: 6px 6px 0px #000;--shadow-glow-amber: 4px 4px 0px #000;--font-display: "Plus Jakarta Sans", "Inter", "PingFang SC", "Microsoft YaHei", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;--font-body: "Inter", "PingFang SC", "Microsoft YaHei", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", sans-serif;--font-mono: "JetBrains Mono", "Fira Code", "Consolas", "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol", monospace;--ease-out: cubic-bezier(.16, 1, .3, 1);--ease-spring: cubic-bezier(.34, 1.56, .64, 1);--duration-fast: .15s;--duration-normal: .25s;--duration-slow: .4s;--topbar-h: 56px;--chat-width: 380px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html,body{height:100%;overflow:hidden;font-family:var(--font-body);font-size:14px;line-height:1.5;color:var(--text-primary);background:var(--bg-base);-webkit-font-smoothing:antialiased}::selection{background:#7c3aed59;color:#000}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#0003;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#fff3}.topbar{position:fixed;top:0;left:0;right:0;height:var(--topbar-h);display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:var(--space-md);padding:0 var(--space-lg);background:var(--bg-surface);border-bottom:2px solid #000;z-index:100}.topbar-left,.topbar-right{display:flex;align-items:center;gap:var(--space-sm)}.topbar-center{display:flex;justify-content:center;flex-shrink:0}.topbar-right{justify-self:end}.canvas-list-menu{position:absolute;top:calc(var(--topbar-h) + 8px);left:var(--space-md);width:320px;max-height:400px;display:flex;flex-direction:column;background:var(--bg-surface);border:2px solid var(--glass-border);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);z-index:150;opacity:0;visibility:hidden;pointer-events:none;transform:translateY(-8px);transition:opacity var(--duration-normal) var(--ease-out),visibility var(--duration-normal) var(--ease-out),transform var(--duration-normal) var(--ease-out)}.canvas-list-menu.open,.canvas-list-menu[aria-hidden=false]{opacity:1;visibility:visible;pointer-events:auto;transform:translateY(0)}.canvas-list-header{display:flex;justify-content:space-between;align-items:center;padding:12px 16px;border-bottom:2px solid var(--glass-border);background:var(--grad-brand-soft)}#newCanvasFromListBtn{width:36px;height:36px;border-radius:var(--radius-md);background:var(--grad-brand);color:#000;border:2px solid var(--glass-border);box-shadow:var(--shadow-sm);transition:all var(--duration-fast) var(--ease-out)}#newCanvasFromListBtn:hover{transform:scale(1.05);box-shadow:var(--shadow-md)}.canvas-list-title{font-family:var(--font-display);font-size:14px;font-weight:700;color:var(--text-primary)}.canvas-list-items{flex:1;overflow-y:auto;padding:8px 0}.canvas-list-empty{padding:24px 16px;text-align:center;color:var(--text-muted);font-size:13px}.canvas-list-item{display:flex;justify-content:space-between;align-items:center;padding:10px 16px;margin:4px 8px;border-radius:var(--radius-sm);cursor:pointer;transition:all var(--duration-fast) var(--ease-out);border:2px solid transparent}.canvas-list-item:hover{background:var(--glass-hover)}.canvas-list-item.active{background:var(--grad-brand-soft);border-color:var(--glass-border)}.canvas-list-item-info{flex:1;min-width:0}.canvas-list-item-title{display:block;font-size:13px;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.canvas-list-item-meta{display:block;font-size:11px;color:var(--text-muted);margin-top:2px}.canvas-list-item-actions{display:flex;gap:4px;opacity:0;transition:opacity var(--duration-fast)}.canvas-list-item:hover .canvas-list-item-actions{opacity:1}.btn-icon.btn-xs{width:24px;height:24px;border-radius:var(--radius-sm);background:transparent;color:var(--text-muted);border:2px solid transparent}.btn-icon.btn-xs:hover{background:var(--bg-surface);color:var(--text-primary);border-color:var(--glass-border)}.btn-icon.btn-xs.delete-canvas-btn:hover{background:#ef444426;color:var(--accent-red)}.logo{display:flex;align-items:center;gap:var(--space-sm)}.logo-text{font-family:var(--font-display);font-weight:700;font-size:15px;color:#000;white-space:nowrap;flex-shrink:0}.logo-svg{width:20px;height:20px}.board-title{font-family:var(--font-display);font-size:15px;font-weight:600;color:var(--text-primary);cursor:pointer;padding:4px 12px;border-radius:var(--radius-sm);border:2px solid transparent;transition:all var(--duration-fast) var(--ease-out);white-space:nowrap;max-width:min(100%,300px);overflow:hidden;text-overflow:ellipsis}.board-title:hover{border-color:var(--glass-border);background:var(--glass-bg)}.topbar-divider{width:1px;height:20px;background:var(--glass-border);margin:0 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1),minmax(0,1fr));align-items:start}.file-preview-pager{grid-template-columns:minmax(0,1fr)}.file-preview-page{display:grid;gap:4px;min-width:0}.file-page-title{font-size:11px;font-weight:700;color:var(--text-muted)}.file-preview-frame{position:relative;width:100%;aspect-ratio:4 / 3;min-height:120px;overflow:hidden;border:2px solid #000;background:#f8f9fa;cursor:crosshair}.file-pdf-canvas,.file-image-preview{width:100%;display:block;border:0;pointer-events:none}.file-pdf-canvas{height:auto;background:#fff}.file-image-preview{height:100%;object-fit:contain;background:#fff}.file-annotation{position:absolute;z-index:2;border:3px solid #ef4444;background:#ef444414;pointer-events:auto;cursor:pointer}.file-annotation.is-drafting{border-style:dashed;pointer-events:none}.file-generic-preview,.file-preview.is-missing{min-height:72px;display:grid;place-items:center;border:2px dashed #000;color:var(--text-muted);font-size:12px}@keyframes blockEnter{0%{opacity:0;transform:scale(.7) translateY(8px)}60%{opacity:1;transform:scale(1.04) translateY(-2px)}to{transform:scale(1) translateY(0)}}.mm-block.entering{animation:blockEnter .45s var(--ease-spring) forwards}@keyframes drawLine{0%{stroke-dashoffset:300}to{stroke-dashoffset:0}}.node-toolbar{position:absolute;display:flex;flex-direction:column;align-items:stretch;gap:4px;padding:6px;background:#fffffffa;-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);border:2px solid var(--glass-border);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);z-index:20;opacity:0;visibility:hidden;pointer-events:none;transform:translate(8px);transition:opacity var(--duration-normal) var(--ease-out),visibility var(--duration-normal) var(--ease-out),transform var(--duration-normal) 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#00000026;transform:translateY(-1px)}.ntb-matrix-btn:active{transform:translateY(0);box-shadow:1px 1px #00000014}.ntb-matrix-btn--danger{color:var(--accent-red)}.ntb-matrix-btn--danger:hover{background:#ef444426;color:var(--accent-red);border-color:var(--accent-red)}.ntb-matrix-btn svg{flex-shrink:0}.ntb-btn{padding:6px 10px;border-radius:var(--radius-sm);background:transparent;color:var(--text-secondary);font-size:11px;border:2px solid #000;white-space:nowrap;display:flex;align-items:center;justify-content:center;gap:4px}.ntb-btn:hover{background:var(--glass-hover);color:var(--text-primary)}.ntb-btn--danger:hover{background:#ef444426;color:var(--accent-red)}.ntb-divider{width:1px;height:16px;background:var(--glass-border)}.chat-panel{position:relative;width:var(--chat-width);min-width:300px;max-width:min(900px,calc(100vw - 260px));display:flex;flex-direction:column;background:var(--bg-surface);border-left:2px solid #000;transition:width var(--duration-slow) var(--ease-out),opacity var(--duration-normal) var(--ease-out);overflow:hidden}.chat-panel.collapsed{min-width:0;width:0;opacity:0;border-left:none}.chat-panel.resizing{transition:none}.chat-resize-handle{position:absolute;left:-5px;top:0;bottom:0;width:10px;cursor:ew-resize;z-index:20;touch-action:none}.chat-resize-handle:after{content:"";position:absolute;left:4px;top:0;bottom:0;width:2px;background:transparent;transition:background var(--duration-fast)}.chat-resize-handle:hover:after,.chat-panel.resizing .chat-resize-handle:after{background:#000}body.chat-resizing{cursor:ew-resize;-webkit-user-select:none;user-select:none}.chat-panel-header{display:flex;align-items:center;justify-content:space-between;padding:10px var(--space-lg);border-bottom:2px solid #000;flex-shrink:0}.chat-panel-title{font-family:var(--font-display);font-size:14px;font-weight:600;color:var(--text-primary);display:flex;align-items:center;gap:8px}.chat-collapse-btn{width:28px;height:28px;border-radius:var(--radius-sm);background:transparent;color:var(--text-muted);border:2px solid #000;cursor:pointer;transition:all var(--duration-fast)}.chat-collapse-btn:hover{color:var(--text-primary);background:var(--glass-bg)}.chat-expand-btn{position:fixed;right:var(--space-md);bottom:var(--space-md);width:44px;height:44px;border-radius:50%;background:var(--grad-brand);color:#000;border:2px solid #000;cursor:pointer;box-shadow:var(--shadow-lg),var(--shadow-glow-purple);display:none;align-items:center;justify-content:center;z-index:50;transition:transform var(--duration-fast) var(--ease-spring)}.chat-expand-btn.visible{display:flex}.chat-expand-btn:hover{transform:scale(1.1)}.chat-messages{flex:1;overflow-y:auto;padding:var(--space-lg);display:flex;flex-direction:column;gap:var(--space-md)}.chat-welcome{display:flex;flex-direction:column;align-items:center;text-align:center;padding:var(--space-2xl) var(--space-lg);gap:var(--space-sm);color:var(--text-secondary);font-size:13px}.chat-welcome-icon{font-size:32px;margin-bottom:var(--space-sm)}.chat-welcome p{line-height:1.6}.chat-welcome-hints{display:flex;flex-wrap:wrap;gap:var(--space-sm);justify-content:center;margin-top:var(--space-lg)}.hint-chip{padding:6px 12px;border-radius:16px;background:var(--glass-bg);border:2px solid var(--glass-border);color:var(--text-secondary);font-size:12px;cursor:pointer;transition:all var(--duration-fast) 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.2s var(--ease-spring)}.group-rename-header{font-size:14px;font-weight:600;color:var(--text-primary);margin-bottom:12px}.group-rename-input{width:100%;padding:8px 12px;border:2px solid var(--glass-border);border-radius:var(--radius-sm);font-size:14px;font-family:inherit;margin-bottom:12px;box-sizing:border-box}.group-rename-input:focus{outline:none;border-color:var(--accent-purple)}.group-rename-actions{display:flex;gap:8px;justify-content:flex-end}.group-rename-cancel,.group-rename-save{padding:6px 12px;border:2px solid #000;border-radius:var(--radius-sm);font-size:12px;cursor:pointer;transition:all var(--duration-fast)}.group-rename-cancel{background:transparent;color:var(--text-secondary)}.group-rename-cancel:hover{background:var(--glass-hover);color:var(--text-primary)}.group-rename-save{background:var(--accent-purple);color:#fff;border-color:var(--accent-purple)}.group-rename-save:hover{opacity:.9}.link-scissors-btn{position:absolute;width:28px;height:28px;background:#ef4444;border:2px solid #000;border-radius:50%;cursor:pointer;display:none;align-items:center;justify-content:center;z-index:500;box-shadow:var(--shadow-md);pointer-events:auto;transition:transform var(--duration-fast),opacity var(--duration-fast)}.link-scissors-btn.visible{display:flex;animation:scissorsPop .2s var(--ease-spring)}@keyframes scissorsPop{0%{transform:scale(0);opacity:0}to{transform:scale(1);opacity:1}}.link-scissors-btn:hover{transform:scale(1.1);background:#dc2626}.link-scissors-btn:active{transform:scale(.95)}.link-scissors-btn svg{width:16px;height:16px;stroke:#fff;stroke-width:2;pointer-events:none}.link-scissors-mode-btn{flex:0 0 40px;align-self:stretch;width:40px;min-height:32px;padding:0;background:var(--bg-surface);border:2px solid var(--glass-border);border-radius:var(--radius-md);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all var(--duration-fast);opacity:.7}.link-scissors-mode-btn:hover{opacity:1;background:var(--glass-hover)}.link-scissors-mode-btn.active{background:#ef4444;border-color:#000;opacity:1}.link-scissors-mode-btn.active svg{stroke:#fff}.link-scissors-mode-btn svg{width:20px;height:20px;stroke:var(--text-primary);stroke-width:2}@keyframes flowDash{to{stroke-dashoffset:-240}}.mm-block.selected:after{content:"Tab: 子块  Enter: 同级  F2: 编辑  Del: 删除";position:absolute;top:-20px;left:50%;transform:translate(-50%);font-size:10px;color:var(--text-muted);white-space:nowrap;opacity:0;visibility:hidden;pointer-events:none;transition:opacity var(--duration-fast) var(--ease-out),visibility var(--duration-fast) var(--ease-out)}.mm-block.selected:hover:after{opacity:.6;visibility:visible}.mm-color-bar{position:absolute;top:0;left:12px;right:12px;height:3px;border-radius:0;opacity:1;border-bottom:2px solid #000}.canvas-empty-state{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);text-align:center;pointer-events:none;animation:fadeSlideUp .6s var(--ease-out)}.empty-icon{font-size:48px;margin-bottom:12px;filter:grayscale(.2)}.empty-title{font-family:var(--font-display);font-size:18px;font-weight:600;color:var(--text-primary);margin-bottom:8px}.empty-hint{font-size:13px;color:var(--text-muted);line-height:1.6}.export-menu{min-width:160px;padding:6px;background:#fffffff2;-webkit-backdrop-filter:blur(16px) saturate(1.4);backdrop-filter:blur(16px) saturate(1.4);border:2px solid var(--glass-border);border-radius:var(--radius-md);box-shadow:var(--shadow-lg);z-index:300;animation:ctxEnter .15s var(--ease-out)}.export-item{display:flex;align-items:center;gap:8px;width:100%;padding:8px 12px;border:2px solid #000;border-radius:var(--radius-sm);background:transparent;color:var(--text-secondary);font-family:var(--font-body);font-size:13px;cursor:pointer;transition:all var(--duration-fast)}.export-item:hover{background:var(--glass-hover);color:var(--text-primary)}.export-icon{font-size:14px;width:20px;text-align:center;opacity:.7}.canvas-minimap{position:absolute;bottom:var(--space-md);left:var(--space-md);width:180px;height:120px;background:#fffffff2;-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:2px solid var(--glass-border);border-radius:var(--radius-md);z-index:10;cursor:crosshair;overflow:hidden;opacity:.75;transition:opacity var(--duration-normal) var(--ease-out),box-shadow var(--duration-normal) var(--ease-out)}.canvas-minimap:hover{opacity:1;box-shadow:var(--shadow-lg),var(--shadow-glow-purple)}.minimap-canvas{display:block;width:100%;height:100%}.link-layer path{cursor:default;transition:stroke-width var(--duration-fast),stroke var(--duration-fast),opacity var(--duration-fast)}.link-layer path.link-structure{stroke-dasharray:none;animation:none;opacity:.5}.link-layer path[data-link-role^=bundle-bg-]{stroke-dasharray:none!important;animation:none!important;stroke-linecap:round}.link-layer path.link-conn[data-dash-role=flow]{stroke-dasharray:8 4;animation:flowDash 20s linear infinite}.link-layer path.link-conn[data-dash-role=structured]{stroke-dasharray:6 5;animation:none;opacity:.9}.link-layer path.link-conn[data-dash-role=detour]{stroke-dasharray:5 5;animation:flowDash 28s linear infinite}.link-layer path.ctrl-hover{stroke:#ef4444!important;stroke-width:5!important;cursor:not-allowed!important}.link-delete-hint{position:fixed;z-index:1000;padding:6px 10px;background:#000000d9;color:#fff;border-radius:var(--radius-sm);font-size:11px;pointer-events:none;display:flex;align-items:center;gap:6px;opacity:0;transition:opacity var(--duration-fast)}.link-delete-hint.visible{opacity:1}.link-delete-hint svg{width:14px;height:14px}.mm-block.dragging{cursor:grabbing;opacity:.92;z-index:50;box-shadow:var(--shadow-lg)}.mm-link-handle{position:absolute;bottom:-10px;left:50%;transform:translate(-50%);width:16px;height:16px;border-radius:50%;background:var(--glass-bg);border:2px solid #000;background:#ffd600;box-shadow:var(--shadow-sm);cursor:crosshair;z-index:10;opacity:0;transition:opacity var(--duration-fast),transform var(--duration-fast)}.mm-block:hover .mm-link-handle,.mm-block.selected .mm-link-handle{opacity:1}.mm-block.position-locked .mm-link-handle{display:none}.mm-link-handle:hover{background:var(--accent-purple);transform:translate(-50%) scale(1.3);box-shadow:var(--shadow-glow-purple)}.temp-link{pointer-events:none;animation:flowDash 20s linear infinite;opacity:.6}.spin{animation:spin 1s linear infinite}@keyframes spin{to{transform:rotate(360deg)}}.mm-lock-icon{position:absolute;top:-12px;right:-12px;font-size:14px;background:#fff;border-radius:50%;padding:4px;border:2px solid #000;box-shadow:2px 2px #000;z-index:10}.refine-confirm-box{position:absolute;z-index:1000;background:var(--bg-surface);border:2px solid #000;padding:12px;box-shadow:var(--shadow-sm);display:flex;flex-direction:column;gap:8px;pointer-events:auto}.refine-confirm-box[aria-hidden=true]{display:none}.rc-btn{padding:6px 12px;border:2px solid #000;font-weight:700;cursor:pointer;background:#fff}.rc-btn-yes{background:var(--accent-green);color:#fff}.rc-btn-yes:hover{background:#059669}.rc-btn-no{background:var(--bg-surface)}.rc-btn-no:hover{background:#f3f4f6}