:root{--fg:#1d2433;--muted:#5a6478;--bg:#f6f7f9;--card:#fff;--line:#dfe3ea;--accent:#2457d6;--warn:#fff6dd;--warnline:#e5c76b}
*{box-sizing:border-box}
body{margin:0;font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--fg);background:var(--bg)}
main{max-width:46rem;margin:0 auto;padding:1.5rem 1rem 4rem}
h1{font-size:2rem;line-height:1.2;margin:.2rem 0 .4rem}
h2{font-size:1.3rem;margin:2rem 0 .5rem}
h3{font-size:1.05rem;margin:1.2rem 0 .3rem}
a{color:var(--accent)}
.brand{font-weight:700;letter-spacing:.02em}
.lead{font-size:1.15rem;color:#2c3548}
.card{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:1rem 1.2rem;margin:1rem 0}
.warn{background:var(--warn);border-color:var(--warnline)}
.btn{display:inline-block;background:var(--accent);color:#fff;text-decoration:none;padding:.65rem 1.1rem;border-radius:8px;font-weight:600;margin:.3rem .5rem .3rem 0}
.btn.alt{background:#fff;color:var(--accent);border:1px solid var(--accent)}
blockquote{margin:.6rem 0;padding:.4rem 1rem;border-left:4px solid var(--line);color:#2c3548;background:#fafbfc}
table{border-collapse:collapse;width:100%;font-size:.95rem}
th,td{border:1px solid var(--line);padding:.45rem .6rem;text-align:left;vertical-align:top}
th{background:#eef1f6}
code{background:#eef1f6;padding:.05rem .3rem;border-radius:4px;font-size:.92em;word-break:break-all}
details{margin:.4rem 0}summary{cursor:pointer;font-weight:600}
.muted{color:var(--muted)}.small{font-size:.88rem}
footer{margin-top:2.5rem;border-top:1px solid var(--line);padding-top:1rem}
ul,ol{padding-left:1.3rem}