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var(--mono);letter-spacing:.11em;text-transform:uppercase}._title_bpu1u_23{font-family:var(--disp);letter-spacing:-.025em;font-size:19px;font-weight:580;line-height:1.2}._explanation_bpu1u_24{max-width:62ch;color:var(--ink-2);font-size:14px;line-height:1.45}._expand_bpu1u_25{z-index:2;border:1px solid var(--rule-ui);background:color-mix(in srgb, var(--surface) 88%, transparent);width:40px;height:40px;color:var(--ink-2);cursor:pointer;transition:transform .16s var(--ease-out), color .16s ease, border-color .16s ease;border-radius:10px;place-items:center;display:grid;position:absolute;bottom:10px;right:10px}._expand_bpu1u_25:hover{color:var(--accent-ink);border-color:var(--accent)}._expand_bpu1u_25:active{transform:scale(.95)}._canvas_bpu1u_36{border:1px solid color-mix(in srgb, var(--rule-ui) 42%, transparent);background:radial-gradient(circle at 50% 44%, color-mix(in srgb, var(--accent-soft) 35%, transparent), transparent 53%), linear-gradient(color-mix(in srgb, var(--surface) 92%, transparent), color-mix(in srgb, var(--paper) 95%, transparent));isolation:isolate;border-radius:14px;width:100%;height:clamp(300px,39vw,380px);min-height:300px;position:relative;overflow:hidden}._compact_bpu1u_18 ._canvas_bpu1u_36{height:clamp(285px,36vw,350px)}._canvas_bpu1u_36 canvas:active{cursor:grabbing!important}._orbitHint_bpu1u_53{width:max-content;max-width:100%;color:var(--ink-2);align-items:baseline;gap:7px;padding:0 2px;font-size:12px;line-height:1.25;display:flex}._orbitHint_bpu1u_53 strong{color:var(--accent-ink);font:700 11px/1 var(--mono);letter-spacing:.04em}._controls_bpu1u_66{flex-wrap:wrap;align-items:center;gap:10px;min-height:44px;display:flex}._controls_bpu1u_66 button{min-height:44px;font:600 14px/1 var(--sans);cursor:pointer;transition:transform .16s var(--ease-out), color .16s var(--ease-out), background-color .16s var(--ease-out), border-color .16s var(--ease-out);border-radius:12px;padding:0 14px}._controls_bpu1u_66 button:active:not(:disabled){transform:scale(.98)}._controls_bpu1u_66 button:disabled{cursor:default;opacity:.48}._primary_bpu1u_78{background:var(--ink);color:var(--on-accent);border:none}._hintRequest_bpu1u_79{margin-left:auto}._secondary_bpu1u_80,._reset_bpu1u_80{border:1px solid var(--rule-ui);color:var(--ink-2);background:0 0}._reset_bpu1u_80{margin-left:auto}._views_bpu1u_82{border:1px solid var(--rule-ui);background:color-mix(in srgb, var(--surface) 74%, transparent);border-radius:13px;align-items:center;gap:5px;padding:4px;display:inline-flex}._views_bpu1u_82>span{color:var(--ink-3);font:650 9px/1 var(--mono);letter-spacing:.08em;text-transform:uppercase;padding:0 7px}._controls_bpu1u_66 ._views_bpu1u_82 button{min-height:36px;color:var(--ink-2);background:0 0;border:0;border-radius:9px;padding:0 10px;font-size:12px}._controls_bpu1u_66 ._views_bpu1u_82 button:active{background:var(--accent-soft)}._tools_bpu1u_86{flex:100%;gap:6px;display:flex;overflow-x:auto}._tools_bpu1u_86 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span{background:var(--rule-ui);border-radius:3px;width:100%;height:3px}._progress_bpu1u_96 ._done_bpu1u_98{background:var(--accent)}._loading_bpu1u_100{grid-auto-flow:column;place-content:center;gap:6px;height:100%;display:grid}._loading_bpu1u_100 span{background:var(--accent);border-radius:50%;width:7px;height:7px;animation:.9s ease-in-out infinite alternate _pulse_bpu1u_1}._loading_bpu1u_100 span:nth-child(2){animation-delay:.12s}._loading_bpu1u_100 span:nth-child(3){animation-delay:.24s}._jxg_bpu1u_105{isolation:isolate;touch-action:none;margin:0;position:relative;overflow:hidden}._jxg_bpu1u_105 svg text{cursor:default;-webkit-user-select:none;user-select:none}._jxg_bpu1u_105 .JXGtext{font-family:var(--sans);background:0 0;margin:0;padding:0}._jxg_bpu1u_105 .geometry-object-label{background:color-mix(in srgb, var(--surface) 82%, transparent);box-shadow:0 1px 4px color-mix(in srgb, var(--ink) 9%, transparent);border-radius:6px;padding:2px 5px}._jxg_bpu1u_105 :focus{outline:none}._jxg_bpu1u_105 [tabindex="0"]:focus-visible{filter:drop-shadow(0 0 3px var(--accent))}._invalid_bpu1u_132{border-left:2px solid var(--rule-ui);color:var(--ink-2);gap:4px;padding:15px 17px;display:grid}._invalid_bpu1u_132 strong{color:var(--ink);font-size:15px}._invalid_bpu1u_132 span{font-size:13px;line-height:1.45}._invalid_bpu1u_132 small{color:var(--ink-3);font:10px/1.4 var(--mono)}._retry_bpu1u_136{border:0;border-bottom:1px dashed var(--ink-3);min-height:40px;color:var(--accent-ink);font:650 13px/1 var(--body);cursor:pointer;background:0 0;justify-self:start;margin-top:5px;padding:0}._retry_bpu1u_136:active{transform:scale(.98)}@media (hover:hover) and (pointer:fine){._retry_bpu1u_136:hover{color:var(--accent)}}._srOnly_bpu1u_139{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}._fullscreen_bpu1u_141{z-index:1000;width:100vw;height:100dvh;padding:max(16px, env(safe-area-inset-top)) max(16px, env(safe-area-inset-right)) max(16px, env(safe-area-inset-bottom)) max(16px, env(safe-area-inset-left));background:var(--ground);box-shadow:none;border:0;border-radius:0;position:fixed;inset:0}._fullscreen_bpu1u_141 ._canvas_bpu1u_36{background:var(--surface);border-radius:18px;flex:auto;height:auto;min-height:0}._fullscreen_bpu1u_141 ._caption_bpu1u_20,._fullscreen_bpu1u_141 ._controls_bpu1u_66{flex:none}@keyframes _pulse_bpu1u_1{to{opacity:.25;transform:translateY(-4px)}}._figure_bpu1u_1._textbook_bpu1u_161{box-shadow:none;background:0 0;border:0;border-radius:0;gap:10px;padding:0;overflow:visible}._textbook_bpu1u_161 ._canvas_bpu1u_36{height:auto;min-height:0;width:min(100%, calc(420px * var(--figure-ratio,1.35)));aspect-ratio:var(--figure-ratio,1.35);background:0 0;border:0;border-radius:0;order:0;align-self:center}._textbook_bpu1u_161 ._caption_bpu1u_20{border-top:1px solid var(--rule);order:1;align-items:flex-start;gap:12px;min-height:0;padding-top:12px}._textbook_bpu1u_161 ._title_bpu1u_23{font:500 14px/1.45 var(--sans);letter-spacing:0;color:var(--ink-2)}._textbook_bpu1u_161 ._explanation_bpu1u_24{font-size:14px;line-height:1.5}._textbook_bpu1u_161 ._expand_bpu1u_25{background:0 0;border:0;justify-content:center;width:44px;padding:0;font-size:0}._textbook_bpu1u_161 ._expand_bpu1u_25 span{font-size:19px}._textbook_bpu1u_161 ._controls_bpu1u_66,._textbook_bpu1u_161 ._orbitHint_bpu1u_53{order:3}._explore_bpu1u_169{min-height:44px;color:var(--accent-ink);font:500 14px/1.4 var(--sans);cursor:pointer;background:0 0;border:0;order:2;align-self:flex-start;padding:0}._walkthrough_bpu1u_170{border:1px solid color-mix(in srgb, var(--rule-ui) 50%, transparent);background:color-mix(in srgb, var(--accent-soft) 45%, var(--surface));border-radius:14px;order:1;gap:10px;padding:14px 16px;display:grid}._walkHead_bpu1u_171{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;display:flex}._walkKicker_bpu1u_172{color:var(--accent-ink);font:650 10px/1.2 var(--mono);letter-spacing:.11em;text-transform:uppercase}._walkSteps_bpu1u_173{gap:6px;display:flex}._walkSteps_bpu1u_173 button{border:1px solid var(--rule-ui);background:var(--surface);width:32px;height:32px;color:var(--ink-2);font:650 13px/1 var(--mono);cursor:pointer;border-radius:50%}._walkSteps_bpu1u_173 button[aria-selected=true]{color:#fff;background:#e8571e;border-color:#e8571e}._walkText_bpu1u_176{min-height:44px;color:var(--ink);font:400 15.5px/1.55 var(--sans);margin:0}._walkNav_bpu1u_177{flex-wrap:wrap;align-items:center;gap:10px;display:flex}._walkPrimary_bpu1u_178{background:var(--accent);min-height:40px;color:var(--on-accent);font:600 14px/1 var(--sans);cursor:pointer;border:0;border-radius:10px;padding:0 16px}._walkSecondary_bpu1u_179{border:1px solid var(--rule-ui);min-height:40px;color:var(--ink-2);font:500 14px/1 var(--sans);cursor:pointer;background:0 0;border-radius:10px;padding:0 14px}._walkSecondary_bpu1u_179:disabled{opacity:.45;cursor:default}._walkCount_bpu1u_181{color:var(--ink-3);font:500 12px var(--mono);margin-left:auto}._notes_bpu1u_182{order:1;gap:8px;max-width:66ch;display:grid}._notes_bpu1u_182 p{cursor:default;margin:0}._note_bpu1u_182{text-align:left;min-height:44px;color:var(--ink-2);font:400 15px/1.55 var(--sans);cursor:pointer;background:0 0;border:0;border-left:2px solid #0000;padding:8px 12px}._note_bpu1u_182[aria-pressed=true]{border-left-color:var(--accent);color:var(--accent-ink)}._note_bpu1u_182:focus-visible{outline:2px solid var(--accent);outline-offset:2px}._notes_bpu1u_182 small{color:var(--ink-3);font:400 12px/1.5 var(--sans);padding-left:14px}._textbook_bpu1u_161 ._jxg_bpu1u_105 .geometry-object-label{box-shadow:none;background:0 0;border-radius:0;padding:0}._reading_bpu1u_189 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var(--accent-soft) 70%, var(--surface));color:var(--ink);border-radius:999px;padding:2px 9px}._facts_bpu1u_242 button{min-width:32px;min-height:32px;color:var(--ink-3);cursor:pointer;background:0 0;border:0;margin-left:auto;font-size:18px}._zoomHint_bpu1u_246{color:var(--ink-3);flex-wrap:wrap;order:1;justify-content:space-between;align-items:center;gap:12px;font-size:13px;display:flex}._download_bpu1u_249{z-index:2;border:1px solid var(--rule-ui);background:color-mix(in srgb, var(--surface) 88%, transparent);width:40px;height:40px;color:var(--ink-2);cursor:pointer;opacity:0;border-radius:10px;place-items:center;transition:opacity .16s,color .16s;display:grid;position:absolute;bottom:10px;right:56px}._canvas_bpu1u_36:hover ._download_bpu1u_249,._download_bpu1u_249:focus-visible,._fullscreen_bpu1u_141 ._download_bpu1u_249{opacity:1}._download_bpu1u_249:hover{color:var(--accent-ink);border-color:var(--accent)}._textbook_bpu1u_161 ._download_bpu1u_249{background:0 0;border:0;width:44px;right:50px}._textbook_bpu1u_161 ._canvas_bpu1u_36{max-height:55svh}._orbitHint_bpu1u_53{flex-wrap:wrap;gap:10px 16px}._linkButton_bpu1u_265{min-height:32px;color:var(--accent-ink);font:500 13px/1.3 var(--sans);cursor:pointer;border:0;border-bottom:1px dashed var(--ink-3);background:0 0;padding:0}._linkButton_bpu1u_265:hover{color:var(--accent)}._unfold_bpu1u_267{color:var(--ink-2);align-items:center;gap:8px;font-size:13px;display:inline-flex}._unfold_bpu1u_267 select{border:1px solid var(--rule-ui);background:var(--surface);min-height:32px;color:var(--ink);font:inherit;border-radius:8px;padding:0 8px}._unfoldedPanel_bpu1u_269{border:1px dashed color-mix(in srgb, var(--rule-ui) 70%, transparent);border-radius:14px;order:2;grid-template-columns:minmax(0,1fr);gap:8px;min-width:0;padding:12px 14px;display:grid}._unfoldedCanvas_bpu1u_270{aspect-ratio:1.3;width:min(100%,420px);min-width:0;margin:0 auto;position:relative}@media (hover:none){._download_bpu1u_249{opacity:1}}