:root{--fg:#1d2330;--mut:#566074;--acc:#0b5cad;--bg:#fff;--line:#dde2ea}
*{box-sizing:border-box}body{margin:0;font:16px/1.6 system-ui,-apple-system,Segoe UI,Roboto,sans-serif;color:var(--fg);background:var(--bg)}
header{display:flex;gap:1rem;align-items:center;justify-content:space-between;padding:.8rem 1rem;border-bottom:1px solid var(--line);flex-wrap:wrap}
.brand{font-weight:700;color:var(--fg);text-decoration:none}nav a{margin-left:1rem;color:var(--acc)}
main{max-width:860px;margin:0 auto;padding:1rem}h1{font-size:1.7rem;line-height:1.25}h2{font-size:1.2rem;margin-top:2rem}
a{color:var(--acc)}table{border-collapse:collapse;width:100%;margin:.5rem 0}th,td{border-bottom:1px solid var(--line);padding:.35rem .5rem;text-align:left}tr.me{background:#eef5ff;font-weight:600}
.calc{border:1px solid var(--line);border-radius:10px;padding:1rem;background:#f8fafc}fieldset{border:1px solid var(--line);border-radius:8px;margin:.8rem 0}
label{display:block;margin:.4rem 0}input{font:inherit;padding:.4rem;width:10rem;margin-left:.5rem;border:1px solid #9aa4b5;border-radius:6px}
output{display:block;font-size:1.25rem;font-weight:700;margin-top:.4rem;color:#0a3d75}.hint,.src,footer{color:var(--mut);font-size:.9rem}
footer{max-width:860px;margin:2rem auto;padding:1rem;border-top:1px solid var(--line)}