:root{--paper:#fbf9f3;--ink:#1e1c19;--soft:#5d5850;--rule:#d8d1c3;--link:#0b4fc4;--visited:#5a3aa8;--mark:#ffe680;--box:#fff;--tint:#f3efe4;--good:#1d6a33;--bad:#a2271c}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%}body{margin:0;background:var(--paper);color:var(--ink);font:18px/1.62 Charter,"Bitstream Charter","Sitka Text",Cambria,Georgia,serif}.w{max-width:720px;margin:0 auto;padding:0 18px}a{color:var(--link);text-underline-offset:2px;text-decoration-thickness:1px}a:visited{color:var(--visited)}a:hover{text-decoration-thickness:2px}h1,h2,h3,summary,label,legend,.sans,.top,footer,.byline,.toc,.arrive,table,.out,.btn{font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}.top{border-bottom:1px solid var(--ink);padding:12px 0;font-size:15px;line-height:1.4}.top a{color:var(--ink);text-decoration:none}.top .logo{font-weight:800;letter-spacing:-.01em;white-space:nowrap}.top .logo b{display:inline-block;background:var(--ink);color:var(--paper);font-size:12px;line-height:1;padding:4px 5px 3px;margin-right:7px;border-radius:2px;vertical-align:1px}.top .here{color:var(--soft)}.top .sep{color:var(--rule);margin:0 6px}h1{font-size:clamp(1.75rem,5.2vw,2.35rem);line-height:1.12;letter-spacing:-.02em;margin:30px 0 8px}h2{font-size:1.32rem;line-height:1.25;margin:42px 0 8px;letter-spacing:-.01em}h3{font-size:1.06rem;margin:26px 0 4px}.byline{font-size:14px;color:var(--soft);margin:0 0 20px}.lede{font-size:1.14rem}mark{background:linear-gradient(transparent 52%,var(--mark) 52%);color:inherit;padding:0 1px}.arrive{background:var(--mark);padding:9px 12px;font-size:15px;margin:0 0 16px}.toc{font-size:15px;background:var(--tint);padding:10px 14px;margin:20px 0}.toc a{margin-right:4px}.calc{background:var(--box);border:2px solid var(--ink);padding:16px 18px 0;margin:26px 0 30px}.calc>h2{margin:0 0 2px;font-size:1.22rem}.calc .sub{font-size:15px;color:var(--soft);margin:0 0 6px;font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}label,legend{display:block;font-weight:600;font-size:15px;line-height:1.35;margin:14px 0 5px}.hint{display:block;font-weight:400;color:var(--soft);font-size:14px;margin-top:2px}input[type=text],select{width:100%;font:500 18px/1.2 ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;padding:10px;border:1.5px solid var(--ink);border-radius:3px;background:#fff;color:var(--ink);-webkit-appearance:none;appearance:none}select{font-family:system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif;font-size:16px;background-image:linear-gradient(45deg,transparent 50%,var(--ink) 50%),linear-gradient(135deg,var(--ink) 50%,transparent 50%);background-position:calc(100% - 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