:root{--ink:#16202a;--mut:#566573;--bg:#fbfaf7;--card:#fff;--line:#dcd8cc;--acc:#1b4f8a;--acc2:#e9f0f8;--warn:#fff6dc}
@media(prefers-color-scheme:dark){:root{--ink:#e9edf1;--mut:#a7b3be;--bg:#10171d;--card:#17212a;--line:#2d3b47;--acc:#8cc0f0;--acc2:#1a2937;--warn:#33301a}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:17px/1.6 system-ui,-apple-system,"Segoe UI",sans-serif}
a{color:var(--acc)}
.w{max-width:46rem;margin:0 auto;padding:0 1rem}
header{border-bottom:1px solid var(--line)}
header .w{display:flex;justify-content:space-between;align-items:center;gap:1rem;padding:.9rem 1rem;flex-wrap:wrap}
.brand{font-weight:800;text-decoration:none;color:var(--ink)}
nav a{margin-left:1rem;font-size:.95rem}
h1{font-size:clamp(1.7rem,5vw,2.5rem);line-height:1.15;margin:2rem 0 .8rem}
h2{font-size:1.35rem;margin:2.2rem 0 .5rem}
h3{font-size:1.05rem;margin:1.4rem 0 .3rem}
.lede{font-size:1.1rem;color:var(--mut)}
.btn{display:inline-block;background:var(--acc);color:var(--bg);font-weight:700;border-radius:8px;padding:.7rem 1.2rem;text-decoration:none}
.box{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:1rem 1.2rem;margin:1rem 0}
.sample{background:var(--warn);border:1px solid var(--line);border-radius:8px;padding:.6rem .9rem;font-size:.95rem}
.src{font-size:.88rem;color:var(--mut)}
.mail{white-space:pre-wrap;font:.92rem/1.5 ui-monospace,Menlo,Consolas,monospace;background:var(--card);border:1px solid var(--line);border-radius:8px;padding:.8rem}
.tw{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:.9rem;min-width:36rem}
td,th{border:1px solid var(--line);padding:.35rem .5rem;text-align:left;vertical-align:top}
th{background:var(--acc2)}
ul,ol{padding-left:1.3rem}
footer{border-top:1px solid var(--line);margin-top:3rem;padding:1.2rem 0 2rem;font-size:.9rem;color:var(--mut)}
:focus-visible{outline:3px solid var(--acc);outline-offset:2px}