:root{--paper:#f7f7f3;--ink:#111217;--muted:#5c5d66;--line:#dcdcd6;--blue:#3047ff}
*{box-sizing:border-box}
body{margin:0;padding:48px 24px 80px;background:var(--paper);color:var(--ink);
     font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;
     font-size:1.0625rem;line-height:1.6}
main{max-width:44rem;margin-inline:auto}
h1{font-size:clamp(2rem,7vw,2.8rem);font-weight:900;line-height:1.05;letter-spacing:-.03em;margin:0 0 8px}
h2{font-size:1.25rem;font-weight:800;margin:36px 0 10px}
p,li{color:#2a2b33}
.muted{color:var(--muted)}
.todo{padding:14px 16px;border-left:3px solid #ff4d00;background:#fff4ef;border-radius:6px;margin:20px 0}
a{color:var(--blue)}
.back{display:inline-block;margin-top:40px;font-weight:700}