.factor-lesson{margin-top:24px;padding:24px;border:1px solid var(--line,#243943);border-radius:10px;background:linear-gradient(135deg,#10292a,#0c1921 65%);color:var(--ink,#e1edf0)}
.factor-heading{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:15px}
.factor-heading h2{margin:6px 0 0;font-family:var(--serif,Georgia,serif);font-size:29px;line-height:1.2}
.factor-kicker{display:block;font-family:var(--mono,monospace);font-size:9px;letter-spacing:.13em;color:var(--teal,#41d5b6)}
.factor-toy-badge,.factor-bits{font-family:var(--mono,monospace);font-size:9px;white-space:nowrap;color:var(--muted,#96aeb9);border:1px solid var(--line,#243943);padding:5px 8px;border-radius:4px}
.factor-intro{max-width:730px;font-size:12px;line-height:1.8;color:var(--muted,#96aeb9)}
.factor-predict{margin-top:20px;padding-top:18px;border-top:1px solid var(--line,#243943)}
.factor-predict>p{font-size:13px;margin:0 0 10px}
.factor-predictions{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.factor-predictions button{min-height:46px;padding:10px 12px;text-align:left;border:1px solid #35535b;background:#10212b;color:var(--ink,#e1edf0);border-radius:5px;font-size:11px;line-height:1.5}
.factor-predictions button:hover:not(:disabled){background:#183d39;border-color:var(--teal,#41d5b6)}
.factor-predictions button[aria-pressed=true]{border-color:var(--teal,#41d5b6);background:#173f35;color:#c5f5e5}
.factor-predictions button:disabled:not([aria-pressed=true]){color:#78929e;background:#0e1d25;border-color:#263c44}
.factor-controls{display:flex;flex-wrap:wrap;align-items:center;gap:12px;margin:18px 0}
.factor-run,.factor-continue{background:var(--teal,#41d5b6);color:#06231c;border-radius:5px;min-height:44px;padding:11px 16px;font-weight:600;font-size:12px;border:1px solid var(--teal,#41d5b6)}
.factor-run:hover:not(:disabled),.factor-continue:hover{background:#62e8cb}
.factor-run:disabled{background:#15352e;border-color:#2a5147;color:#8ead9f}
.factor-reset{background:none;border:1px solid var(--line,#243943);border-radius:5px;padding:11px 13px;min-height:44px;font-size:11px;color:var(--muted,#96aeb9)}
.factor-reset:hover{background:#132b32;color:var(--ink,#e1edf0)}
.factor-controls p{font-family:var(--mono,monospace);font-size:9px;color:var(--muted,#96aeb9)}
.factor-comparison{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.factor-card{min-width:0;display:flex;flex-direction:column;background:#0a1720;border:1px solid #2b4852;border-radius:7px;padding:18px}
.factor-card-complete{border-color:#3b8873}
.factor-card-top{display:flex;justify-content:space-between;align-items:center;gap:12px}
.factor-card h3{font-family:var(--mono,monospace);font-size:22px;font-weight:500;line-height:1.3;margin:13px 0 8px}
.factor-start{font-size:11px;line-height:1.7;color:var(--muted,#96aeb9);margin-bottom:15px}
.factor-equation{background:#122831;border:1px solid #28444f;border-radius:5px;padding:13px;display:flex;flex-direction:column;gap:7px}
.factor-equation>span:first-child{font-family:var(--mono,monospace);font-size:10px;color:var(--muted,#96aeb9)}
.factor-equation strong{font-family:var(--mono,monospace);font-size:12px;line-height:1.6;font-weight:500;overflow-wrap:anywhere}
.factor-square-state{color:var(--muted,#96aeb9);font-size:10px;line-height:1.6}
.factor-card-complete .factor-square-state{color:var(--teal,#41d5b6)}
.factor-count{display:flex;align-items:baseline;gap:10px;margin:15px 0}
.factor-count strong{font-family:var(--mono,monospace);font-size:31px;font-weight:400;line-height:1;color:var(--teal,#41d5b6)}
.factor-count span{font-size:10px;color:var(--muted,#96aeb9)}
.factor-reveal{padding:13px;background:#102f29;border:1px solid #285c4f;border-radius:5px;margin-bottom:14px}
.factor-reveal>strong{display:block;font-family:var(--mono,monospace);font-size:20px;font-weight:500;color:#c5f5e5;margin-top:6px}
.factor-reveal p{font-family:var(--mono,monospace);font-size:10px;line-height:1.8;color:#a7cbbc;margin-top:5px;overflow-wrap:anywhere}
.factor-history{margin:0 0 14px;padding:0;list-style:none;color:var(--muted,#96aeb9);font-family:var(--mono,monospace);font-size:9px}
.factor-history li{display:grid;grid-template-columns:1fr 1fr auto;gap:8px;border-bottom:1px solid #203740;padding:5px 0}
.factor-history strong{font-weight:400;color:#a7cbbc}
.factor-step{margin-top:auto;min-height:42px;background:#16382f;border:1px solid #356657;border-radius:4px;padding:10px;font-size:11px;color:#c5f5e5}
.factor-step:hover:not(:disabled){background:#215046;border-color:var(--teal,#41d5b6)}
.factor-step:disabled{background:#112823;border-color:#29463d;color:#8fab9e}
.factor-status{font-size:11px;line-height:1.7;color:#b2d3c9;margin:14px 0 0;min-height:20px}
.factor-takeaway{margin-top:18px;border-top:1px solid #2d5147;padding-top:18px}
.factor-takeaway h3{font-family:var(--serif,Georgia,serif);font-size:23px;line-height:1.3;margin:7px 0 10px}
.factor-takeaway p{font-size:12px;line-height:1.8;max-width:700px;color:var(--muted,#96aeb9)}
.factor-identity{display:inline-block;background:#102f29;border:1px solid #285c4f;border-radius:5px;padding:11px 15px;font-family:var(--mono,monospace);font-size:12px;color:#c5f5e5;margin:14px 0;overflow-wrap:anywhere;max-width:100%}
.factor-continue{display:inline-flex;gap:16px;align-items:center;margin-top:15px}
.factor-method{margin-top:16px;border-top:1px solid var(--line,#243943);padding-top:13px;color:var(--muted,#96aeb9);font-size:11px}
.factor-method summary{cursor:pointer;padding:4px 0;min-height:34px;color:#b2d3c9}
.factor-method p{font-size:11px;line-height:1.8;margin-top:7px;max-width:700px}
.factor-limit{font-size:10px;line-height:1.8;color:var(--muted,#96aeb9);border-top:1px solid var(--line,#243943);padding-top:13px;margin-top:19px}
.factor-lesson button:focus-visible,.factor-method summary:focus-visible{outline:2px solid var(--teal,#41d5b6);outline-offset:4px}
@media(max-width:760px){.factor-lesson{padding:19px}.factor-heading h2{font-size:26px}.factor-heading{align-items:flex-start}.factor-predictions{grid-template-columns:1fr}.factor-controls p{flex-basis:100%}.factor-card{padding:15px}.factor-equation{padding:10px}.factor-equation strong{font-size:11px}.factor-reveal>strong{font-size:18px}.factor-history{font-size:8px}}
@media(max-width:520px){.factor-comparison{grid-template-columns:1fr}.factor-lesson{padding:17px}.factor-toy-badge{font-size:8px;padding:4px 6px}.factor-heading h2{font-size:24px}.factor-heading{gap:10px}.factor-identity{font-size:11px}.factor-history{font-size:10px}.factor-equation strong{font-size:12px}.factor-card h3{font-size:24px}}