:root{--deep:#0b2e1d;--cream:#fff6e3;--paper:#fffdf6;--green:#1e9e5a;--green-dark:#136b3c;--gold:#ffc400;--gold-wash:#fff0b8;--amber:#f2b33d;--red:#d9433b;--text:#0b2e1d;--muted:#0b2e1db8;--shadow:0 4px 0 var(--deep);--shadow-lg:0 6px 0 var(--deep)}@media (prefers-color-scheme:dark){:root{--cream:#0f2a1d;--paper:#153826;--text:#fff6e3;--muted:#fff6e3bd;--gold-wash:#3b3410;--deep:#04140c}}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{background:var(--cream);color:var(--text);margin:0;font:600 17px/1.6 system-ui,-apple-system,Segoe UI,Roboto,sans-serif}img{max-width:100%;height:auto}.wrap{max-width:46rem;margin:0 auto;padding:0 16px}.wrap-wide{max-width:64rem;margin:0 auto;padding:0 16px}.page{padding-top:28px;padding-bottom:56px}.top{background:var(--paper);border-bottom:3px solid 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label{flex:14rem;gap:2px;display:grid}.calc-rate{color:var(--muted);font-size:.9rem}.stepper{align-items:center;gap:8px;display:inline-flex}.stepper input{text-align:center;width:5.2rem;font:inherit;color:var(--text);background:var(--cream);border:3px solid var(--deep);border-radius:14px;padding:8px 4px;font-family:Courier,Courier New,Menlo,monospace;font-size:1.2rem;font-weight:900}.step-btn{border:3px solid var(--deep);background:var(--gold);color:#0b2e1d;cursor:pointer;width:46px;height:46px;box-shadow:0 3px 0 var(--deep);border-radius:50%;font-size:1.5rem;font-weight:900;line-height:1}.step-btn:active{box-shadow:0 1px 0 var(--deep);transform:translateY(2px)}.calc-total{text-align:center;margin-top:18px}.calc-sum{margin:0;font-size:clamp(2.2rem,9vw,3.2rem);font-weight:900}.calc-detail{color:var(--muted);margin:4px 0 0;font-size:.92rem}.quiz{margin:22px 0}.quiz-prompt{outline:none;margin:0 0 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