:root{--ink:#142033;--ink-soft:#3a4a63;--paper:#f4ecd9;--paper-2:#ebe1c8;--navy:#101c31;--navy-2:#18263f;--magenta:#b31b4a;--chart:#1d4e8c;--ok:#1c6b48;--warn:#9a4d12;--rule:#14203324;--white:#fbf7ee;--shadow:0 0 0 1px var(--rule);color:var(--ink);background:var(--paper);font-synthesis:none;text-rendering:optimizelegibility;font-family:IBM Plex Sans,Segoe UI,sans-serif;line-height:1.45}*{box-sizing:border-box}html,body,#root{min-height:100%;margin:0}button,input,select{font:inherit;color:inherit}button{cursor:pointer}a{color:var(--chart)}.app{grid-template-columns:248px 1fr;min-height:100vh;display:grid}.rail{background:var(--navy);color:var(--paper);flex-direction:column;gap:28px;height:100vh;padding:28px 18px 24px;display:flex;position:sticky;top:0}.brand{flex-direction:column;gap:4px;padding:0 8px;display:flex}.brand strong{letter-spacing:-.03em;font-family:Fraunces,Georgia,serif;font-size:28px;font-weight:650}.brand 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var(--ink);background:var(--ink);color:var(--paper);min-height:40px;padding:9px 14px}.btn.ghost{color:var(--ink);background:0 0}.btn.magenta{background:var(--magenta);border-color:var(--magenta)}.btn:disabled{opacity:.45;cursor:not-allowed}.pill{border:1px solid var(--rule);color:var(--ink-soft);background:var(--white);align-items:center;gap:6px;padding:3px 8px;font-size:12px;display:inline-flex}.pill.ok{color:var(--ok);border-color:color-mix(in srgb, var(--ok) 40%, white)}.pill.bad{color:var(--magenta)}.lesson-list{flex-direction:column;display:flex}.lesson-list button{text-align:left;background:var(--white);border:1px solid var(--rule);border-bottom:0;grid-template-columns:48px 1fr auto;align-items:center;gap:14px;padding:14px 16px;display:grid}.lesson-list button:last-child{border-bottom:1px solid var(--rule)}.lesson-list button:hover{background:var(--paper-2)}.lesson-list .num{color:var(--magenta);font-family:IBM Plex Mono,monospace;font-size:13px}.lesson-list 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0;padding:18px}.takeaways ol{margin:8px 0 0;padding-left:18px}.q-prompt{max-width:70ch;margin:8px 0 18px;font-size:18px}.choices{flex-direction:column;gap:8px;display:flex}.choices button{text-align:left;background:var(--white);border:1px solid var(--rule);padding:12px 14px}.choices button:hover:not(:disabled){border-color:var(--ink)}.choices button.picked{border-color:var(--ink);box-shadow:inset 3px 0 0 var(--ink)}.choices button.good{border-color:var(--ok);box-shadow:inset 3px 0 0 var(--ok)}.choices button.bad{border-color:var(--magenta);box-shadow:inset 3px 0 0 var(--magenta)}.explain{background:var(--white);border:1px solid var(--rule);margin-top:14px;padding:14px}.exam-meta{border-bottom:1px solid var(--rule);justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:18px;padding-bottom:12px;font-family:IBM Plex Mono,monospace;font-size:13px;display:flex}.dots{flex-wrap:wrap;gap:4px;margin:16px 0;display:flex}.dots button{border:1px solid 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4px}.figure-frame{background:var(--white);border:1px solid var(--rule);max-width:70ch;margin:0 0 20px;padding:14px}.figure-art{margin:10px 0 8px}.figure-svg{width:100%;height:auto;color:var(--ink);display:block}.figure-svg.on-dark{color:var(--paper)}.figure-svg .fig-label{fill:currentColor;font-family:IBM Plex Mono,monospace;font-size:12px}.fig-hit{cursor:pointer}.figure-steps{flex-wrap:wrap;gap:6px;margin:8px 0;display:flex}.figure-steps button{border:1px solid var(--rule);background:var(--paper);padding:6px 10px;font-size:12px}.figure-steps button.on{background:var(--navy);color:var(--paper);border-color:var(--navy)}.watch-root{z-index:40;background:#0b1220;flex-direction:column;justify-content:center;align-items:center;gap:10px;padding:12px;display:flex;position:fixed;inset:0}.watch-stage{aspect-ratio:16/9;background:var(--navy);width:min(100%,177.778vh - 248.889px);max-width:1280px;color:var(--paper);grid-template-rows:auto 1fr auto auto;padding:14px 18px 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