.geometry-lab{--geo-ink:#193b54;--geo-teal:#16776f;--geo-gold:#b27622;--geo-purple:#7257a0;color:var(--geo-ink);padding-bottom:56px}.geo-intro{grid-template-columns:1.5fr 1fr;align-items:end;gap:50px;padding:28px 0 32px;display:grid}.geo-intro h1{letter-spacing:-.04em;margin:10px 0 12px;font-size:clamp(30px,3.6vw,50px);line-height:1.4}.geo-thesis{color:var(--geo-teal);margin:0;font-size:21px}.geo-intro>p{color:#526e80;margin:0 0 4px;font-size:15px;line-height:2}.geo-workbench{background:#fff;border:1px solid #c5d9e5;border-radius:12px;min-width:0;margin:0;padding:0;overflow:hidden}.geometry-lab button{min-height:44px;color:var(--geo-ink);font:inherit;cursor:pointer;background:#fff;border:1px solid #a9c3d2;border-radius:5px;padding:9px 14px;font-size:13px}.geometry-lab button:hover{background:#eaf4f8}.geometry-lab button:disabled{opacity:.45;cursor:default}.geometry-lab button[aria-pressed=true],.geometry-lab button.geo-primary{color:#fff;border-color:var(--geo-teal);background:var(--geo-teal)}.geometry-lab :focus-visible{outline:3px solid var(--geo-gold);outline-offset:3px}.geo-station{background:#edf5fa;border-bottom:1px solid #c5d9e5;align-items:center;gap:18px;padding:16px 22px;display:flex}.geo-station h2{margin:0;font-size:19px}.geo-station>span{color:#526e80;font-size:12px}.geo-station>div{gap:8px;margin-left:auto;display:flex}.geo-condition{background:#f8fbfd;border-bottom:1px solid #d8e6ed;grid-template-columns:1fr 1fr;gap:24px;padding:20px 24px;display:grid}.geo-condition p{margin:0;font-size:13px;line-height:1.9}.geo-condition b{color:var(--geo-teal);margin-bottom:5px;font-size:12px;display:block}.geo-first{border-bottom:1px solid #d8e6ed;align-items:center;gap:30px;padding:20px 24px;display:flex}.geo-first>div{flex:1}.geo-first h3{margin:0 0 6px;font-size:17px}.geo-first p{color:#526e80;margin:0;font-size:13px;line-height:1.9}.geo-console{grid-template-columns:minmax(0,1fr) 270px;display:grid}.geo-canvas-column{min-width:0}.geo-legend{color:#526e80;flex-wrap:wrap;gap:12px;padding:15px 22px;font-size:11px;display:flex}.geo-board{aspect-ratio:10/7;touch-action:none;width:100%;display:block;overflow:hidden}.geo-board .geo-label{fill:#193b54;paint-order:stroke;stroke:#f7fbfd;stroke-width:5px;stroke-linejoin:round;font:20px IBM Plex Mono,Noto Sans SC Variable,sans-serif}.geo-board .geo-helper-label{fill:#8b5d19;font:16px Noto Sans SC Variable,sans-serif}.geo-fixed{fill:#193b54;stroke:#fff;stroke-width:2px}.geo-known,.geo-baseline{stroke:#819cae;stroke-width:3px;fill:none}.geo-baseline{stroke:#698ca1}.geo-allowed{stroke:#7257a0;stroke-width:10px;stroke-linecap:round;fill:none}.geo-route,.geo-string{stroke:#16776f;stroke-width:4px;fill:none;stroke-linejoin:round}.geo-string{stroke-width:5px}.geo-helper{stroke:#b27622;stroke-width:2.5px;stroke-dasharray:7 5;fill:none}.geo-outline{stroke:#90aeba;stroke-width:2px;fill:none}.geo-chord{stroke:#6f8fa3;stroke-width:2px;fill:none}.geo-intercepted{stroke:#7257a0;stroke-width:7px;opacity:.7;fill:none}.geo-angle{stroke:#b27622;stroke-width:3px;fill:none}.geo-rod{stroke:#16776f;stroke-width:9px;stroke-linecap:round;fill:none}.geo-construction{stroke:#b27622;stroke-width:2px;stroke-dasharray:5 6;fill:none;opacity:.55}.geo-axis{stroke:#9bb1bf;stroke-width:1.5px;fill:none}.geo-pencil{fill:#c47b21}.geo-degenerate{stroke:#7257a0;stroke-width:6px;fill:none}.geo-error-label{fill:#7257a0;font:20px Noto Sans SC Variable,sans-serif}.geo-handle-halo{fill:#16776f;opacity:.12}.geo-handle-dot{fill:#16776f;stroke:#fff;stroke-width:3px}#geo-handle{touch-action:none;cursor:grab;outline:none}#geo-handle:active{cursor:grabbing}#geo-handle:focus-visible .geo-handle-halo{fill:#b27622;opacity:.6}#geo-handle.geo-point-locked{cursor:default}.geo-point-locked .geo-handle-dot{fill:#193b54}.geo-invitation{color:#526e80;margin:0;padding:12px 22px;font-size:12px;line-height:1.8}.geo-invitation span{font-size:11px;display:block}.geo-position{background:#eef7f6;border-block:1px solid #d4e8e2;padding:14px 22px}.geo-position label{justify-content:space-between;align-items:center;gap:12px;font-size:13px;display:flex}.geo-position output{color:#16776f;font:15px IBM Plex Mono,monospace}.geo-position input,.geo-parameters input{accent-color:#16776f;width:100%;min-height:44px;display:block}.geo-readings{background:#d8e6ed;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;margin:0;display:grid}.geo-readings>div{background:#f8fbfd;min-width:0;padding:16px}.geo-readings dt{color:#526e80;font-size:11px}.geo-readings dd{color:#16776f;overflow-wrap:anywhere;margin:9px 0 0;font:17px IBM Plex Mono,Noto Sans SC Variable,sans-serif}.geo-state-note{color:#526e80;overflow-wrap:anywhere;margin:0;padding:18px 22px;font-size:12px;line-height:1.9}.geo-sidebar{background:#f1f6fa;border-left:1px solid #d8e6ed;min-width:0;padding:24px}.geo-small-title{color:#193b54;margin:0 0 12px;font-size:12px;font-weight:650}.geo-sidebar>button{text-align:left;width:100%;margin-bottom:12px}.geo-sidebar p:not(.geo-small-title){color:#526e80;font-size:12px;line-height:1.9}.geometry-lab summary{cursor:pointer;min-height:44px;padding:12px 0;font-size:13px}.geo-parameters{border-block:1px solid #cedee8;margin-top:16px}.geo-parameters label{margin:18px 0;display:block}.geo-parameters label span{justify-content:space-between;gap:8px;font-size:12px;display:flex}.geo-parameters output{font-family:IBM Plex Mono,monospace;font-size:12px}.geo-verification{margin-top:24px}.geo-verification button{width:100%}.geo-verification #geo-task-note{border-left:3px solid #16776f;padding-left:12px}.geo-reference{border-top:1px solid #cedee8;margin-top:20px}.geo-reference button{width:100%}.geo-transfer,.geometry-lab .study-notebook{border-top:1px solid #d8e6ed;padding:26px}.geo-transfer h2,.study-notebook h2{margin:0 0 14px;font-size:22px;line-height:1.7}.geo-transfer [role=group],.study-notebook>div:first-child{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.geo-transfer p:not(.kicker),.study-notebook p{color:#526e80;font-size:13px;line-height:1.9}.study-notebook h2{flex:1;margin:0}.study-notebook #study-records{grid-template-columns:1fr 1fr;gap:14px;display:grid}.study-notebook article{border:1px solid #c5d9e5;border-radius:5px;min-width:0;padding:18px}.study-notebook #study-comparison{color:#16776f}.geo-reasoning{border-bottom:1px solid #c5d9e5;grid-template-columns:1.6fr 1fr;gap:50px;padding:42px 0;display:grid}.geo-reasoning h2{margin:10px 0 16px;font-size:29px;line-height:1.6}.geo-reasoning p,.geo-reasoning li{color:#526e80;font-size:14px;line-height:2}.geo-reasoning details{border-top:1px solid #c5d9e5;margin-top:18px}.geo-reasoning ol{padding-left:22px}.geo-reasoning li+li{margin-top:18px}.geo-reasoning aside{background:#edf5fa;border-radius:6px;align-self:start;padding:24px}.geo-teaching{color:#526e80;border-bottom:1px solid #c5d9e5;flex-wrap:wrap;gap:20px;padding:24px 0;display:flex}.geo-teaching b{color:#193b54;font-size:12px}.geo-teaching p{flex:1;min-width:250px;margin:0;font-size:12px;line-height:1.9}.geo-next{justify-content:space-between;gap:20px;margin-top:28px;font-size:14px;display:flex}.geo-noscript{background:#fff2d9;padding:20px;font-size:14px;line-height:1.9}@media (width<=1000px){.geo-readings{grid-template-columns:1fr 1fr}.geo-readings dd{font-size:18px}}@media (width<=760px){.geo-intro{grid-template-columns:1fr;gap:18px;padding:20px 0 28px}.geo-intro h1{font-size:32px}.geo-thesis{font-size:18px}.geo-intro>p{font-size:14px}.geo-console{grid-template-columns:1fr}.geo-condition{grid-template-columns:1fr;gap:16px;padding:18px}.geo-station{flex-wrap:wrap;gap:8px 16px;padding:16px}.geo-station>div{flex-basis:100%;margin:4px 0 0}.geo-station h2{font-size:18px}.geo-first{padding:18px;display:block}.geo-first>button{width:100%;margin-top:14px}.geo-legend{gap:8px;padding:12px 16px;font-size:10px}.geo-invitation,.geo-state-note,.geo-position{padding:12px 16px}.geo-readings>div{padding:14px 16px}.geo-readings dd{font-size:18px}.geo-sidebar{border-top:1px solid #d8e6ed;border-left:0;padding:20px}.geo-transfer,.geometry-lab .study-notebook{padding:20px}.geo-transfer h2{font-size:20px}.study-notebook h2{flex-basis:100%;margin-bottom:8px}.study-notebook #study-records{grid-template-columns:1fr}.geo-reasoning{grid-template-columns:1fr;gap:24px;padding:30px 0}.geo-reasoning h2{font-size:25px}.geo-teaching{display:block}.geo-teaching p{min-width:0;margin-top:12px}.geo-next{flex-direction:column}.geo-board .geo-label{font-size:28px}.geo-board .geo-helper-label{font-size:24px}}