:root{--ink:#17233A;--paper:#F6F8FA;--rule:#D5DEE8;--blue:#2456A6;--hl:#FFD84D;--mut:#4A5870}
*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--ink);font:1.0625rem/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
h1,h2,h3{font-family:"Iowan Old Style","Palatino Linotype",Georgia,serif;line-height:1.2;margin:2rem 0 .6rem}
h1{font-size:clamp(1.9rem,5vw,2.8rem);margin-top:.6rem}h2{font-size:1.5rem}h3{font-size:1.15rem}
.wrap{max-width:46rem;margin:0 auto;padding:0 1.1rem}.top .wrap,.home .wrap{max-width:60rem}
a{color:var(--blue)}a:focus-visible,button:focus-visible,input:focus-visible{outline:3px solid var(--hl);outline-offset:2px}
.skip{position:absolute;left:-99rem}.skip:focus{left:1rem;top:1rem;background:#fff;padding:.5rem;z-index:9}
.top{background:#fff;border-bottom:1px solid var(--rule);background-image:linear-gradient(var(--rule) 1px,transparent 1px);background-size:100% 14px}
.bar{display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;padding-top:.7rem;padding-bottom:.7rem;background:rgba(255,255,255,.92);max-width:none}
.brand{display:flex;align-items:center;gap:.55rem;text-decoration:none;color:var(--ink);font:700 1.35rem Georgia,serif}
.bar nav{display:flex;gap:1.1rem;flex-wrap:wrap}.bar nav a{color:var(--ink);text-decoration:none;font-size:.95rem}.bar nav a:hover{text-decoration:underline}
.bc{font-size:.9rem;color:var(--mut);margin-top:1.2rem}.lead{font-size:1.2rem;color:var(--mut)}
.cards{display:grid;gap:1rem;margin:1.5rem 0}@media(min-width:640px){.cards{grid-template-columns:1fr 1fr}}
.card{display:block;background:#fff;border:1px solid var(--rule);border-left:5px solid var(--blue);padding:1rem 1.1rem;text-decoration:none;color:var(--ink)}
.card strong{display:block;font:700 1.15rem Georgia,serif;margin-bottom:.3rem}.card span{color:var(--mut);font-size:.95rem}.card:hover{border-left-color:var(--hl)}
.calc{background:#fff;border:1px solid var(--rule);padding:1.1rem;margin:1.2rem 0;display:grid;gap:.8rem}
.calc .q{margin:0;font-weight:700}label{display:grid;gap:.25rem;font-size:.9rem;color:var(--mut)}
input{font:inherit;padding:.65rem .7rem;border:1px solid #9AA9BC;border-radius:4px;width:100%;color:var(--ink)}
button{font:inherit;font-weight:700;background:var(--ink);color:#fff;border:0;padding:.75rem 1.2rem;border-radius:4px;cursor:pointer;justify-self:start;min-height:44px}button:hover{background:var(--blue)}
@media(min-width:640px){.calc{grid-template-columns:1fr 1fr auto;align-items:end}.calc .q,.res{grid-column:1/-1}}
.res:empty{display:none}.res{border-top:1px dashed var(--rule);padding-top:.8rem}.res ol{margin:.4rem 0;padding-left:1.3rem}
.ans{font:700 1.4rem Georgia,serif;background:linear-gradient(transparent 62%,var(--hl) 62%);display:inline-block;padding:0 .2rem}.err{color:#A32020}
table{border-collapse:collapse;width:100%;background:#fff;margin:1rem 0}th,td{border:1px solid var(--rule);padding:.55rem .7rem;text-align:left}th{background:#EAF0F7}
footer{margin-top:4rem;border-top:1px solid var(--rule);background:#fff;padding:1.5rem 0;font-size:.92rem;color:var(--mut)}.foot a{margin-right:1rem}
@media(prefers-reduced-motion:reduce){*{transition:none!important}}.calc.one{grid-template-columns:1fr}.calc select{font:inherit;padding:.65rem .7rem;border:1px solid #9AA9BC;border-radius:4px;background:#fff;color:var(--ink)}.frac{display:grid;grid-template-columns:1fr 1fr;gap:.6rem}@media(min-width:640px){.calc.one .frac{grid-template-columns:1fr 1fr 5rem 1fr 1fr}}.pts{display:grid;grid-template-columns:1fr 1fr;gap:.6rem}@media(min-width:640px){.pts{grid-template-columns:repeat(4,1fr)}}.byline{display:flex;gap:.7rem;align-items:center;font-size:.9rem;color:var(--mut);margin:.2rem 0 1rem;line-height:1.35}.byline img{border-radius:50%;object-fit:cover}.author{display:grid;gap:1.2rem;margin:1rem 0}@media(min-width:640px){.author{grid-template-columns:200px 1fr}}.author img{width:100%;max-width:200px;height:auto;border-radius:6px;border:1px solid var(--rule)}.chips{display:flex;flex-wrap:wrap;gap:.4rem;padding:0;list-style:none}.chips li{background:#EAF0F7;padding:.2rem .6rem;border-radius:3px;font-size:.9rem}