:root{--accent:#b5710e;--measure:#b5710e;--measure-bg:#b5710e1a;--deduced:#9e3a1a;--deduced-bg:#9e3a1a1a;--construction:#6b5b3e;--construction-bg:#6b5b3e14;--sun-ray:#d4a528;--angle-mark:#9e3a1a;--triangle-fill:#b5710e1f;--triangle-stroke:#b5710e;--proof-fill:#9e3a1a26;--interactive:#8a6310;--interactive-hover:#6e4f0d}blockquote.formula{border-left-color:var(--accent)}.callout-emphasis{max-width:640px;margin:var(--space-lg) auto;padding:var(--space-md) var(--space-lg);border-left:3px solid var(--deduced);background:var(--deduced-bg);font-size:1.0625rem;font-weight:600;line-height:1.55}.geo-figure{max-width:960px;margin:var(--space-lg) auto;background:var(--bg);border:1px solid var(--rule);border-radius:2px;position:relative;overflow:hidden}.geo-figure svg{width:100%;height:auto;display:block}.geo-figure-caption{color:var(--ink-light);padding:var(--space-sm) var(--space-md);border-top:1px solid var(--rule);font-family:"Source Sans 3",system-ui,sans-serif;font-size:.875rem;line-height:1.5}.readout{color:var(--ink);background:var(--bg-subtle);padding:var(--space-xs) var(--space-sm);text-align:right;border-radius:2px;min-width:3ch;font-family:Source Code Pro,Menlo,monospace;font-size:.9375rem;display:inline-block}.readout-label{color:var(--ink-light);margin-right:var(--space-xs);font-family:"Source Sans 3",system-ui,sans-serif;font-size:.8125rem;font-weight:500}.readout-panel{text-align:center;margin:var(--space-sm) 0;justify-content:center;align-items:center;gap:var(--space-xs);flex-wrap:wrap;display:flex}.readout-row{align-items:center;gap:var(--space-xs);display:flex}.readout.measured{border-left:3px solid var(--measure)}.readout.deduced{border-left:3px solid var(--deduced)}.readout.deduced[data-state=hidden]{color:var(--ink-light);font-style:italic}.readout.deduced[data-state=revealed]{color:var(--deduced);font-weight:700}.geo-slider{appearance:none;background:var(--rule);cursor:pointer;border-radius:2px;outline:none;width:100%;height:4px}.geo-slider::-webkit-slider-thumb{appearance:none;background:var(--interactive);cursor:pointer;border:2px solid var(--bg);border-radius:50%;width:20px;height:20px;box-shadow:0 1px 3px #0003}.geo-slider::-moz-range-thumb{background:var(--interactive);cursor:pointer;border:2px solid var(--bg);border-radius:50%;width:20px;height:20px;box-shadow:0 1px 3px #0003}.geo-slider:focus-visible::-webkit-slider-thumb{outline:2px solid var(--interactive);outline-offset:2px}.geo-slider:focus-visible::-moz-range-thumb{outline:2px solid var(--interactive);outline-offset:2px}.geo-slider-sm{max-width:200px}.button-hint{color:var(--ink-light);text-align:center;margin-top:var(--space-xs);font-size:.8125rem;font-style:italic;transition:opacity .3s}.button-hint.hidden{opacity:0;pointer-events:none}.guess-reveal{text-align:center;margin:var(--space-md) 0}.guess-reveal .guess-your{color:var(--ink-light);font-size:1rem}.guess-reveal .guess-answer{color:var(--deduced);margin:var(--space-xs) 0;font-size:2rem;font-weight:700}.guess-reveal .guess-diff{color:var(--ink-light);font-size:.875rem}.triangulator-count{align-items:center;gap:var(--space-xs);background:var(--bg);padding:var(--space-xs) var(--space-sm);border:1px solid var(--rule);border-radius:2px;display:flex;position:absolute;top:16px;right:16px}.triangulator-controls{justify-content:center;align-items:center;gap:var(--space-md);padding:var(--space-sm) var(--space-md);flex-wrap:wrap;display:flex}.vertex-buttons{gap:var(--space-sm);display:flex}.vertex-btn{min-width:44px;min-height:44px;padding:var(--space-xs) var(--space-sm);font-weight:600}.vertex-btn.active{background:var(--interactive);color:#fff;border-color:var(--interactive)}.wobble-container{justify-content:center;gap:var(--space-lg);display:flex}.wobble-panel{text-align:center}.wobble-label{margin-top:var(--space-xs);font-family:"Source Sans 3",system-ui,sans-serif;font-size:.875rem}.wobble-label-flexible{color:var(--ink-light);font-style:italic}.wobble-label-rigid{color:var(--ink);font-weight:700}.pyth-guess{max-width:640px;margin:0 auto}.pyth-triangle-fig{background:0 0;border:none}.pyth-triangle-fig svg{max-height:200px}.pyth-slider-area{text-align:center;padding:var(--space-md)}.pyth-slider-row{align-items:center;gap:var(--space-sm);max-width:480px;margin:var(--space-sm) auto;display:flex}.pyth-slider-row .geo-slider{flex:1}.pyth-actions{justify-content:center;align-items:center;gap:var(--space-md);margin-top:var(--space-sm);display:flex}.pyth-proof{max-width:960px;margin:var(--space-lg) auto 0;text-align:center}.pyth-panels{justify-content:center;align-items:center;gap:var(--space-md);flex-wrap:wrap;display:flex}.pyth-panel{flex:0 400px;max-width:400px}.pyth-panel svg{border:1px solid var(--rule);border-radius:2px;width:100%;height:auto;display:block}.pyth-panel-eq{color:var(--ink);font-size:2rem;font-weight:700}.pyth-panel-label{color:var(--ink);margin-top:var(--space-xs);font-size:1rem;font-weight:600}.pyth-equation{margin:var(--space-md) 0;color:var(--ink);font-size:1.25rem}.pyth-explore-area{justify-content:center;align-items:center;gap:var(--space-sm);margin:var(--space-md) 0;flex-wrap:wrap;display:flex}.ratio-lock-layout{gap:var(--space-md);max-width:960px;margin:0 auto;display:flex}.ratio-lock-figure{background:0 0;border:none;flex:0 0 60%;margin:0}.ratio-lock-figure svg{border:1px solid var(--rule);border-radius:2px}.ratio-lock-panel{gap:var(--space-md);flex-direction:column;flex:0 0 38%;justify-content:center;display:flex}.ratio-lock-controls{gap:var(--space-sm);flex-direction:column;display:flex}.ratio-control-row{align-items:center;gap:var(--space-sm);display:flex}.ratio-control-row .geo-slider{flex:1}.ratio-lock-panel .readout-panel{align-items:stretch;gap:var(--space-sm);flex-direction:column}.ratio-lock-panel .readout-row{justify-content:space-between}.ratio-lock-badge{color:var(--ink-light);text-align:center;padding:var(--space-xs);font-family:"Source Sans 3",system-ui,sans-serif;font-size:.8125rem;font-style:italic;transition:color .2s,background-color .2s}.ratio-lock-badge.changed{color:var(--deduced);background:var(--deduced-bg);font-style:normal;font-weight:600}#riverViz .readout-panel{padding:var(--space-sm) var(--space-md)}.river-match{text-align:center;color:var(--deduced);margin:var(--space-sm) 0;padding:var(--space-xs) var(--space-sm);background:var(--deduced-bg);border-radius:2px;max-width:300px;margin-left:auto;margin-right:auto;font-size:1.125rem;font-weight:700}.erat-guess{max-width:640px;margin:0 auto}.erat-earth-fig{background:0 0;border:none}.erat-earth-fig svg{max-width:400px;margin:0 auto;display:block}.erat-slider-area{text-align:center;padding:var(--space-md)}.erat-slider-row{align-items:center;gap:var(--space-sm);max-width:480px;margin:var(--space-sm) auto;display:flex}.erat-slider-row .geo-slider{flex:1}.erat-guess-display{justify-content:center;align-items:center;gap:var(--space-xs);margin:var(--space-sm) 0;display:flex}.erat-guess-display .readout{font-size:1.25rem;font-weight:600}.erat-actions{justify-content:center;align-items:center;gap:var(--space-md);margin-top:var(--space-sm);display:flex}.erat-reveal-phase{max-width:960px;margin:var(--space-lg) auto 0;text-align:center}.erat-equation{margin:var(--space-md) 0;font-size:1.25rem}.erat-explore-area{max-width:480px;margin:var(--space-md) auto;gap:var(--space-sm);flex-direction:column;display:flex}.erat-explore-row{align-items:center;gap:var(--space-sm);display:flex}.erat-explore-row .geo-slider{flex:1;max-width:none}.erat-explore-result{justify-content:center;align-items:center;gap:var(--space-sm);margin-top:var(--space-xs);display:flex}.erat-explore-ref{color:var(--ink-light);text-align:center;font-size:.8125rem;font-style:italic}.viz-label{fill:var(--ink);font-family:"Source Sans 3",system-ui,sans-serif;font-size:14px}.viz-label-measure{fill:var(--measure);font-family:Source Code Pro,Menlo,monospace;font-size:14px;font-weight:600}.viz-label-deduced{fill:var(--deduced);font-family:Source Code Pro,Menlo,monospace;font-size:14px;font-weight:600}.viz-label-construction{fill:var(--construction);font-family:"Source Sans 3",system-ui,sans-serif;font-size:12px}.viz-label-light{fill:var(--ink-light);font-family:"Source Sans 3",system-ui,sans-serif;font-size:12px;font-style:italic}.drag-handle{cursor:grab;fill:var(--interactive);stroke:var(--ink);stroke-width:2px}.drag-handle:hover,.drag-handle:focus{fill:var(--interactive-hover)}.drag-handle:active{cursor:grabbing}.drag-hit-area{fill:#0000;cursor:grab}.drag-hit-area:active{cursor:grabbing}@keyframes pulse-deduced{0%,to{background:0 0}50%{background:var(--deduced-bg)}}.ratio-pulse{animation:.3s pulse-deduced}@keyframes fade-in{0%{opacity:0}to{opacity:1}}.fade-in{animation:.4s forwards fade-in}@media (prefers-reduced-motion:reduce){.ratio-pulse{background:var(--deduced-bg);animation:none}.fade-in{opacity:1;animation:none}.geo-slider{transition:none}}@media (width<=1099px){.geo-slider::-webkit-slider-thumb{width:44px;height:44px}.geo-slider::-moz-range-thumb{width:44px;height:44px}}@media (width<=767px){.ratio-lock-layout{flex-direction:column}.ratio-lock-figure,.ratio-lock-panel{flex:none;width:100%}.ratio-lock-panel .readout-panel{flex-flow:wrap;justify-content:center}.pyth-panels{flex-direction:column}.pyth-panel{flex:none;width:100%;max-width:360px}.pyth-panel-eq{font-size:1.5rem}.erat-earth-fig svg{max-width:260px}.erat-slider-row,.readout-panel{flex-direction:column}.pyth-actions,.erat-actions{gap:var(--space-sm);flex-direction:column}.pyth-actions .btn,.erat-actions .btn{width:100%;min-height:48px}#riverViz .geo-figure svg{aspect-ratio:3/2}}@media (width>=768px) and (width<=1099px){.erat-earth-fig svg{max-width:320px}}