:root{--bg: #f5f5f5;--surface: #ffffff;--surface-2: #f0f0f0;--surface-3: #e5e5e5;--border: #e5e5e5;--text: #3c3c3c;--text-muted: #afafaf;--canvas-grid-dot: rgba(15, 23, 42, .13);--accent: #297DFF;--accent-hover: #1667ec;--accent-shadow: #0f55c7;--correct: #58cc02;--correct-bg: rgba(88, 204, 2, .1);--incorrect: #ff4b4b;--incorrect-bg: rgba(255, 75, 75, .08);--blue-bg: rgba(28, 119, 246, .1);--dock-radius: 8px;--dock-item-radius: 5px;--dock-lift: 0 0 0 1.5px var(--border);--dock-ease: cubic-bezier(.32, .72, 0, 1);--purple: #ce82ff;--yellow: #ffc700;--blue: #297DFF;--green: #58cc02;--red: #E55B86;--orange: #e5925b}@media(prefers-color-scheme:dark){:root{--bg: #1a1a1a;--surface: #262626;--surface-2: #333333;--surface-3: #444444;--border: #444444;--text: #e0e0e0;--text-muted: #a0a0a0;--canvas-grid-dot: rgba(226, 232, 240, .16)}}.drawing-canvas{position:relative;overflow:hidden;background:var(--surface);color:var(--text);touch-action:none}.drawing-canvas__surface{display:block;width:100%;height:calc(100% - var(--canvas-bottom-inset, 0px));touch-action:none;-webkit-user-select:none;user-select:none;outline:none;transition:height .22s var(--dock-ease)}.drawing-canvas__plugin-layer{position:absolute;inset:0;z-index:40;overflow:hidden;pointer-events:none}.drawing-canvas__zoom-control{position:absolute;right:.85rem;bottom:calc(var(--canvas-bottom-inset, 0px) + .85rem);z-index:25;display:flex;align-items:center;gap:.1rem;padding:0;border-radius:var(--dock-radius);background:var(--surface-2);-webkit-user-select:none;user-select:none;transition:bottom .22s var(--dock-ease)}.drawing-canvas__zoom-btn{display:inline-flex;align-items:center;justify-content:center;width:2.2rem;height:2.2rem;border:0;border-radius:var(--dock-item-radius);background:transparent;color:var(--text);cursor:pointer;transition:background .18s var(--dock-ease),transform .18s var(--dock-ease)}.drawing-canvas__zoom-btn:hover{background:var(--surface-2)}.drawing-canvas__zoom-btn:active{transform:scale(.92)}.drawing-canvas__zoom-level{min-width:3.1rem;height:1.9rem;padding:0 .3rem;border:0;border-radius:var(--dock-item-radius);background:transparent;color:var(--text);font:inherit;font-size:.8rem;font-weight:600;font-variant-numeric:tabular-nums;cursor:pointer;transition:background .18s var(--dock-ease)}.drawing-canvas__zoom-level:hover{background:var(--surface-2)}.drawing-canvas__zoom-sep{width:1.5px;height:1.25rem;margin:0 .15rem;border-radius:999px;background:var(--surface-3)}.drawing-canvas__surface--eraser{cursor:crosshair}.drawing-canvas__shape--erasing{opacity:.22;transition:opacity .1s var(--dock-ease)}.drawing-canvas__selection-tools{position:absolute;z-index:45;display:flex;align-items:flex-start;gap:.375rem;transform:translate(.44rem,.44rem);pointer-events:none}.drawing-canvas__selection-tools>*{pointer-events:auto}.drawing-canvas__selection-tools--flipped{flex-direction:row-reverse;transform:translate(calc(-100% + 2.44rem),.44rem)}.drawing-canvas__selection-ai{flex:none;width:2rem;height:2rem;display:inline-flex;align-items:center;justify-content:center;padding:0;border:0;border-radius:var(--dock-item-radius);background:var(--accent);color:#fff;cursor:pointer;transition:background .18s var(--dock-ease),transform .18s var(--dock-ease)}.drawing-canvas__selection-ai:hover{background:var(--accent-hover);transform:scale(1.06)}.drawing-canvas__selection-ai:active{transform:scale(.96)}.drawing-canvas__selection-ai:focus-visible{outline:2px solid #fff;outline-offset:2px}.drawing-canvas__writing-guide-line{stroke:var(--border);stroke-width:7;opacity:.9}.drawing-canvas__dock-wrap{position:absolute;left:50%;bottom:calc(var(--canvas-bottom-inset, 0px) + 1.5rem);z-index:20;display:flex;flex-direction:column;align-items:center;transform:translate(-50%);transition:bottom .22s var(--dock-ease)}.drawing-canvas__toolbar{position:relative;display:flex;align-items:center;gap:.5rem;padding:.3rem;border:0;border-radius:var(--dock-radius);background:var(--surface-2)}.drawing-canvas__style-bar{position:absolute;display:flex;align-items:center;gap:.25rem;padding:.3rem;border-radius:var(--dock-radius);background:var(--surface-2);white-space:nowrap;opacity:0;pointer-events:none;z-index:20}.drawing-canvas__style-bar--visible{opacity:1;pointer-events:auto;animation:drawing-canvas-fade .18s var(--dock-ease) both}@keyframes drawing-canvas-fade{0%{opacity:0}}.drawing-canvas__style-color-wrap{position:relative}.drawing-canvas__style-color-wrap .drawing-canvas__style-btn--active{background:var(--surface-2);color:var(--text)}.drawing-canvas__color-picker-popover--below{bottom:auto;top:calc(100% + 8px)}.drawing-canvas__color-picker-popover--wide{width:182px}.drawing-canvas__style-group{display:flex;align-items:center;gap:.125rem}.drawing-canvas__style-divider{width:2px;height:1.25rem;margin:0 .125rem;border-radius:999px;background:var(--surface-3)}.drawing-canvas__svg-dots{gap:.25rem}.drawing-canvas__svg-dot{width:1.1rem;height:1.1rem;padding:0;border:0;border-radius:50%;box-shadow:inset 0 0 0 1px #0000002e,0 0 0 1px var(--surface-3);cursor:pointer;transition:transform .15s var(--dock-ease)}.drawing-canvas__svg-dot--active{box-shadow:inset 0 0 0 1px #0000002e,0 0 0 2px var(--accent)}.drawing-canvas__svg-dot:hover:not(:disabled){transform:scale(1.18)}.drawing-canvas__svg-dot:disabled{cursor:progress;opacity:.6}.drawing-canvas__style-btn{display:inline-flex;align-items:center;justify-content:center;width:2rem;height:2rem;border:0;border-radius:var(--dock-item-radius);background:transparent;color:var(--text);cursor:pointer;font:inherit;transition:background .18s var(--dock-ease),color .18s var(--dock-ease)}.drawing-canvas__style-btn:hover:not(.drawing-canvas__style-btn--active):not(.drawing-canvas__style-btn--disabled){background:var(--surface-2)}.drawing-canvas__style-btn--active{background:var(--accent);color:#fff}.drawing-canvas__style-btn--disabled{color:var(--text-muted);cursor:not-allowed;opacity:.5}.drawing-canvas__text-format-bar{position:absolute;display:flex;align-items:center;gap:.125rem;padding:.25rem;border-radius:var(--dock-radius);background:var(--surface-2);white-space:nowrap;opacity:0;pointer-events:none;z-index:30}.drawing-canvas__text-format-bar--visible{opacity:1;pointer-events:auto;animation:drawing-canvas-fade .18s var(--dock-ease) both}.drawing-canvas__text-format-bar .drawing-canvas__style-btn{width:1.85rem;height:1.85rem}.drawing-canvas__text-size-select{height:1.85rem;margin:0 .125rem;padding:0 .125rem;border:0;border-radius:var(--dock-item-radius);background:transparent;color:var(--text);font:inherit;font-size:.78rem;cursor:pointer;outline:none;font-weight:500}.drawing-canvas__text-size-select:hover{background:var(--surface-2)}.drawing-canvas__link-popover{display:flex;align-items:center;gap:.25rem}.drawing-canvas__color-picker-popover.drawing-canvas__link-popover{flex-direction:row;width:max-content;box-shadow:none;background:var(--surface-2)}.drawing-canvas__link-input{width:13rem;padding:.35rem .5rem;border:0;border-radius:var(--dock-item-radius);background:var(--surface-3);color:var(--text);font:inherit;font-size:.8rem}.drawing-canvas__link-input:focus{outline:none}.drawing-canvas__color-picker-popover.drawing-canvas__math-popover{width:max-content;max-width:min(26rem,calc(100vw - 2rem));background:var(--surface-2);box-shadow:none}.drawing-canvas__math-popover-body{display:flex;flex-direction:column;gap:.4rem}.drawing-canvas__math-loading{padding:.4rem .2rem;color:var(--text-muted);font-size:.78rem}.drawing-canvas__math-field{display:block;width:100%;min-width:12rem;max-width:min(24rem,calc(100vw - 4rem));min-height:2.6rem;overflow-x:auto;padding:.3rem .4rem;border:0;border-radius:var(--dock-item-radius);background:var(--surface-3);color:var(--text);font-size:1.25rem;line-height:1.2;outline:none;--caret-color: var(--accent);--selection-background-color: color-mix(in srgb, var(--accent) 22%, transparent);--placeholder-color: var(--text-muted)}.drawing-canvas__math-field::part(menu-toggle),.drawing-canvas__math-field::part(virtual-keyboard-toggle){display:none}.drawing-canvas__math-keys{display:flex;max-width:100%;overflow-x:auto;gap:.2rem;scrollbar-width:thin;overscroll-behavior-x:contain}.drawing-canvas__math-key{display:inline-flex;min-width:1.85rem;height:1.85rem;flex:0 0 auto;align-items:center;justify-content:center;padding:0 .35rem;border:0;border-radius:var(--dock-item-radius);background:var(--surface-3);color:var(--text);cursor:pointer;font-family:KaTeX_Main,Times New Roman,Times,serif;font-size:.95rem;line-height:1}.drawing-canvas__math-key:active{transform:scale(.94)}.drawing-canvas__math-error{color:var(--incorrect);font-size:.7rem;line-height:1.25}.drawing-canvas__math-actions{display:flex;justify-content:flex-end;gap:.3rem}.drawing-canvas__math-cancel,.drawing-canvas__math-confirm{padding:.3rem .7rem;border:0;border-radius:var(--dock-item-radius);cursor:pointer;font:inherit;font-size:.78rem;font-weight:500}.drawing-canvas__math-cancel{background:transparent;color:var(--text-muted)}.drawing-canvas__math-confirm{background:var(--accent);color:#fff}.drawing-canvas__math-confirm:disabled{cursor:not-allowed;opacity:.5}.drawing-canvas__color-option-dot--none{background:linear-gradient(135deg,transparent 44%,var(--text-muted) 47%,var(--text-muted) 53%,transparent 56%)}.drawing-canvas__paint-none{display:flex;align-items:center;gap:.45rem;width:100%;padding:.2rem .35rem;border:0;border-radius:var(--dock-item-radius);background:transparent;color:var(--text);font:inherit;font-size:.72rem;font-weight:550;text-align:left;cursor:pointer;transition:background .18s var(--dock-ease)}.drawing-canvas__paint-none:hover,.drawing-canvas__paint-none--active{background:var(--surface-2)}.drawing-canvas__toolbar-group,.drawing-canvas__color-group{display:flex;align-items:center;gap:.25rem}.drawing-canvas__color-group{gap:.125rem}.drawing-canvas__shape-wrap{position:relative}.drawing-canvas__shape-popover{position:absolute;bottom:calc(100% + 10px);left:50%;z-index:100;display:grid;grid-template-columns:repeat(3,2.25rem);gap:.25rem;padding:.4rem;border:0;border-radius:var(--dock-radius);background:var(--surface);box-shadow:var(--dock-lift);transform:translate(-50%);animation:drawing-canvas-pop .2s var(--dock-ease) both}@keyframes drawing-canvas-pop{0%{opacity:0;transform:translate(-50%) translateY(6px) scale(.97)}}.drawing-canvas__shape-option{display:inline-flex;width:2.25rem;height:2.25rem;align-items:center;justify-content:center;border:0;border-radius:var(--dock-item-radius);background:transparent;color:var(--text);cursor:pointer;transition:background .18s var(--dock-ease),color .18s var(--dock-ease)}.drawing-canvas__shape-option:hover:not(.drawing-canvas__shape-option--active){background:var(--surface-2)}.drawing-canvas__shape-option--active{background:var(--accent);color:#fff}.drawing-canvas__toolbar-group--separated{position:relative;padding-right:.5rem}.drawing-canvas__toolbar-group--separated:after{content:"";position:absolute;top:50%;right:0;transform:translateY(-50%);width:2px;height:1.25rem;border-radius:999px;background:var(--surface-3)}.drawing-canvas__toolbar-btn,.drawing-canvas__color-btn{display:inline-flex;align-items:center;justify-content:center;border:0;background:transparent;color:var(--text);cursor:pointer;font:inherit;transition:background .18s var(--dock-ease),color .18s var(--dock-ease),opacity .18s var(--dock-ease),transform .18s var(--dock-ease)}.drawing-canvas__toolbar-btn:active:not(.drawing-canvas__toolbar-btn--disabled),.drawing-canvas__color-btn:active{transform:scale(.92)}.drawing-canvas__toolbar-btn{width:2.25rem;height:2.25rem;border-radius:var(--dock-item-radius)}.drawing-canvas__toolbar-btn:hover:not(.drawing-canvas__toolbar-btn--active):not(.drawing-canvas__toolbar-btn--disabled),.drawing-canvas__color-btn:hover{background:var(--surface-2)}.drawing-canvas__toolbar-btn--active{background:var(--accent);color:#fff}.drawing-canvas__toolbar-btn--active.drawing-canvas__toolbar-btn--fill-icon svg{fill:currentColor}.drawing-canvas__hand-solid,.drawing-canvas__toolbar-btn--active .drawing-canvas__hand-outline{display:none}.drawing-canvas__toolbar-btn--active .drawing-canvas__hand-solid{display:inline}.drawing-canvas__color-wheel-wrap .drawing-canvas__toolbar-btn--active{background:var(--surface-2)}.drawing-canvas__toolbar-btn--disabled{color:var(--text-muted);cursor:not-allowed}.drawing-canvas__toolbar-icon{display:inline-flex;width:1.25rem;height:1.25rem;align-items:center;justify-content:center}.drawing-canvas__toolbar-icon svg{width:1.25rem;height:1.25rem}.drawing-canvas__color-btn{width:1.75rem;height:1.75rem;border-radius:var(--dock-item-radius)}.drawing-canvas__color-trigger{position:relative}.drawing-canvas__color-btn--active{background:var(--surface-2)}.drawing-canvas__color-swatch{width:1.25rem;height:1.25rem;flex-shrink:0;aspect-ratio:1;border-radius:999px;background-color:#fff;background-image:linear-gradient(var(--paint-dot-color, transparent),var(--paint-dot-color, transparent)),conic-gradient(rgb(0 0 0 / 16%) 0 25%,transparent 0 50%,rgb(0 0 0 / 16%) 0 75%,transparent 0);background-size:auto,6px 6px}.drawing-canvas__color-swatch--wheel{background:conic-gradient(#dd5f5f,#ddbe5f,#8fd24b,#3bce60,#3bcece,#5778db,#9e5fdd,#dd5fbe,#dd5f5f)}.drawing-canvas__color-swatch--ring{background-image:radial-gradient(closest-side,transparent 0 60%,var(--paint-dot-color, transparent) 61%),conic-gradient(rgb(0 0 0 / 16%) 0 25%,transparent 0 50%,rgb(0 0 0 / 16%) 0 75%,transparent 0)}.drawing-canvas__color-option-dot--transparent,.drawing-canvas__color-swatch--transparent{background:linear-gradient(135deg,transparent 43%,#e5484d 46%,#e5484d 54%,transparent 57%),#a3a9b3;box-shadow:inset 0 0 0 1px #0000002e}.drawing-canvas__color-wheel-wrap{position:relative}.drawing-canvas__color-picker-popover{--popover-swap-duration: .26s;position:absolute;bottom:calc(100% + 10px);height:fit-content;left:50%;display:flex;flex-direction:column;gap:8px;padding:9px;background:var(--surface);border:0;border-radius:var(--dock-radius);box-shadow:var(--dock-lift);z-index:100;width:134px;transform:translate(-50%);animation:drawing-canvas-pop .2s var(--dock-ease) both;transition:width var(--popover-swap-duration) var(--dock-ease)}.drawing-canvas__popover-views{display:grid;grid-template-rows:1fr 0fr;transition:grid-template-rows var(--popover-swap-duration) var(--dock-ease)}.drawing-canvas__popover-views--custom{grid-template-rows:0fr 1fr}.drawing-canvas__popover-view{display:flex;flex-direction:column;gap:8px;min-height:0;overflow:hidden;transition:opacity var(--popover-swap-duration) var(--dock-ease)}.drawing-canvas__popover-view[inert]{opacity:0}.drawing-canvas__palette-back{display:flex;align-items:center;gap:.15rem;align-self:flex-start;padding:.15rem .35rem .15rem .15rem;border:0;border-radius:var(--dock-item-radius);background:transparent;color:var(--text-muted);font:inherit;font-size:.72rem;cursor:pointer;transition:background .18s var(--dock-ease),color .18s var(--dock-ease)}.drawing-canvas__palette-back:hover{background:var(--surface-2);color:var(--text)}.drawing-canvas__stroke-slider-wrap{display:flex;align-items:center;gap:7px;min-width:0;height:15px}.drawing-canvas__stroke-slider{-webkit-appearance:none;appearance:none;flex:1;min-width:0;max-width:90px;height:4px;border:0;border-radius:999px;background:var(--surface-3);outline:none;cursor:pointer}.drawing-canvas__stroke-slider::-webkit-slider-thumb{-webkit-appearance:none;width:13px;height:13px;border:2px solid var(--surface);border-radius:999px;background:var(--text);cursor:pointer}.drawing-canvas__stroke-slider::-moz-range-thumb{width:13px;height:13px;border:2px solid var(--surface);border-radius:999px;background:var(--text);cursor:pointer}.drawing-canvas__stroke-slider-preview{display:inline-flex;flex:0 0 auto;border-radius:999px;background:currentColor}.drawing-canvas__color-grid{display:grid;grid-template-columns:repeat(3,2.25rem);gap:.25rem;justify-content:center}.drawing-canvas__color-option{display:inline-flex;align-items:center;justify-content:center;width:2.25rem;height:2.25rem;border:0;border-radius:var(--dock-item-radius);background:transparent;cursor:pointer;transition:background .18s var(--dock-ease),transform .18s var(--dock-ease)}.drawing-canvas__color-option:active{transform:scale(.92)}.drawing-canvas__color-option:hover:not(.drawing-canvas__color-option--active){background:var(--surface-2)}.drawing-canvas__color-option--active{background:var(--surface-2)}.drawing-canvas__color-option-dot{width:1.2rem;height:1.2rem;border-radius:999px}.drawing-canvas__stroke-group{display:flex;align-items:center}.drawing-canvas__stroke-wrap{position:relative}.drawing-canvas__stroke-popover{position:absolute;bottom:calc(100% + 10px);left:50%;transform:translate(-50%);display:flex;flex-direction:column;gap:2px;padding:7px;background:var(--surface);border:0;border-radius:var(--dock-radius);box-shadow:var(--dock-lift);z-index:100;animation:drawing-canvas-pop .2s var(--dock-ease) both}.drawing-canvas__stroke-option{display:flex;align-items:center;justify-content:center;border:0;border-radius:var(--dock-item-radius);background:transparent;color:var(--text);cursor:pointer;padding:4px 8px;transition:background .18s var(--dock-ease),color .18s var(--dock-ease)}.drawing-canvas__stroke-option:hover:not(.drawing-canvas__stroke-option--active){background:var(--surface-2)}.drawing-canvas__stroke-option--active{background:var(--accent);color:#fff}@media(max-width:640px){.drawing-canvas__zoom-control{top:.6rem;right:.6rem;bottom:auto}.drawing-canvas__zoom-btn{width:2rem;height:2rem}.drawing-canvas__dock-wrap{bottom:calc(var(--canvas-bottom-inset, 0px) + .6rem);max-width:calc(100% - .8rem)}.drawing-canvas__toolbar{gap:.3rem;padding:.2rem}.drawing-canvas__toolbar-group,.drawing-canvas__color-group{gap:.1rem}.drawing-canvas__toolbar-group--separated{padding-right:.3rem}.drawing-canvas__toolbar-btn{width:2rem;height:2rem;flex-shrink:0}.drawing-canvas__toolbar-icon,.drawing-canvas__toolbar-icon svg{width:1.15rem;height:1.15rem}}.ui-btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;box-sizing:border-box;border:1px solid transparent;border-radius:calc(var(--radius-sm) + 1px);background:transparent;color:var(--text);font:inherit;font-weight:550;line-height:1;white-space:nowrap;cursor:pointer;transition:background-color var(--dur-fast) var(--ease),border-color var(--dur-fast) var(--ease),color var(--dur-fast) var(--ease)}.ui-btn--xs{height:24px;padding:0 7px;font-size:12px}.ui-btn--sm{height:30px;padding:0 10px;font-size:13px}.ui-btn--base{height:36px;padding:0 14px;font-size:14px}.ui-btn--square{padding:0;aspect-ratio:1}.ui-btn--secondary{background:transparent;border:none}.ui-btn--secondary:hover:not(:disabled){background:var(--surface-2)}.ui-btn--ghost{color:var(--text-muted)}.ui-btn--ghost:hover:not(:disabled){color:var(--text);background:var(--surface-3)}.ui-btn--primary{border-color:var(--accent);background:var(--accent);color:#fff}.ui-btn--primary:hover:not(:disabled){border-color:var(--accent-hover);background:var(--accent-hover)}.ui-btn--danger{border-color:var(--incorrect);background:var(--incorrect);color:#fff}.ui-btn--danger:hover:not(:disabled){filter:brightness(.94)}.ui-btn:disabled{opacity:.42;cursor:not-allowed}.ui-btn:focus-visible,.ui-input:focus-visible,.ui-select select:focus-visible{outline:2px solid var(--accent);outline-offset:1px}.ui-spinner{display:inline-block;flex:none;border:2px solid currentColor;border-radius:50%;border-top-color:transparent;opacity:.7;animation:ui-spin .7s linear infinite}@keyframes ui-spin{to{transform:rotate(360deg)}}.ui-field{display:flex;flex-direction:column;gap:6px}.ui-field__label{color:var(--text-muted);font-size:12px;font-weight:600}.ui-input{box-sizing:border-box;width:100%;min-width:0;font-weight:500!important;border-radius:var(--radius);background:var(--surface-2);border:none;color:var(--text);font:inherit;transition:border-color var(--dur-fast) var(--ease),background-color var(--dur-fast) var(--ease)}.ui-input::placeholder{color:var(--text-muted)}.ui-input--xs{height:24px;padding:0 7px;font-size:12px}.ui-input--sm{height:30px;padding:0 8px;font-size:13px}.ui-input--base{height:36px;padding:0 10px;font-size:14px}.ui-input:hover:not(:focus):not(:disabled){border-color:var(--text-muted)}.ui-input:focus{border-color:var(--accent);outline:none}.ui-input:disabled{opacity:.5;cursor:not-allowed}.ui-textarea{height:auto;padding:8px 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