:root{--fg:#1d2327;--bg:#fff;--muted:#555d63;--accent:#1b5e3b;--line:#d5dbd8;--soft:#f3f6f4}
@media (prefers-color-scheme:dark){:root{--fg:#e8ecea;--bg:#14181a;--muted:#a9b3ae;--accent:#7fd1a2;--line:#2e3638;--soft:#1c2224}}
*{box-sizing:border-box}
body{margin:0;font:1.0625rem/1.65 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--fg);background:var(--bg)}
header,main,footer{max-width:46rem;margin:0 auto;padding:1rem}
header{display:flex;flex-wrap:wrap;gap:.5rem 1.5rem;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}
nav{display:flex;flex-wrap:wrap;gap:.25rem 1rem}
a{color:var(--accent);text-underline-offset:.15em}
a:focus-visible,[tabindex]:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
.brand{font-weight:700;font-size:1.15rem;text-decoration:none}
.skip{position:absolute;left:-999px}
.skip:focus{left:1rem;top:1rem;background:var(--bg);padding:.5rem;z-index:1}
h1{font-size:1.9rem;line-height:1.2;margin:1rem 0 .5rem}
h2{font-size:1.35rem;line-height:1.3;margin:2rem 0 .5rem}
.lede{font-size:1.15rem}
.meta{color:var(--muted);font-size:.9rem;margin:.25rem 0}
.hero{max-width:100%;height:auto;border-radius:.4rem}
.guide-list{list-style:none;padding:0}
.guide-list li{padding:.75rem 0;border-bottom:1px solid var(--line)}
.table-wrap{overflow-x:auto;margin:1rem 0;border:1px solid var(--line)}
table{border-collapse:collapse;width:100%;min-width:34rem;font-size:.95rem}
caption{text-align:left;font-weight:600;padding:.5rem}
th,td{padding:.5rem;border-top:1px solid var(--line);text-align:left;vertical-align:top}
thead th{background:var(--soft)}
footer{border-top:1px solid var(--line);margin-top:3rem;color:var(--muted);font-size:.9rem}
.breadcrumb{font-size:.9rem;margin:.5rem 0}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:.25rem;list-style:none;margin:0;padding:0}
.breadcrumb li+li::before{content:"\203A";color:var(--muted);margin-right:.25rem}
.breadcrumb [aria-current]{color:var(--muted)}
.tool{margin:1.5rem 0;padding:1rem;border:1px solid var(--line);border-radius:.4rem;background:var(--soft)}
.tool select,.tool input{font:inherit;padding:.35rem .5rem;max-width:100%;color:var(--fg);background:var(--bg);border:1px solid var(--line);border-radius:.3rem}
.tool-result h2{margin-top:1rem}
.tool-note,.tool-warning{font-size:.9rem;color:var(--muted)}
.tool-warning{color:var(--fg);border-left:3px solid var(--accent);padding-left:.75rem}