:root{--bg:#F5F6FB;--surface:#FFFFFF;--ink:#12142A;--muted:#5D6280;--line:#E2E5F0;--accent:#FF5B37;--warn:#FFF4D6;--warn-ink:#6B4A00;color-scheme:light}
@media (prefers-color-scheme:dark){:root{--bg:#0D0F1E;--surface:#171A30;--ink:#F1F2F9;--muted:#A4A9C6;--line:#2A2E4A;--accent:#FF7A5C;--warn:#3A3017;--warn-ink:#FFDD8A;color-scheme:dark}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:400 1.02rem/1.65 system-ui,-apple-system,"Segoe UI",sans-serif}
.doc{max-width:760px;margin:0 auto;padding:3rem max(16px,env(safe-area-inset-right,0px)) 4rem max(16px,env(safe-area-inset-left,0px))}
h1{font-size:clamp(1.8rem,5vw,2.4rem);line-height:1.1;letter-spacing:-.02em;margin:1rem 0 1.5rem}
h2{font-size:1.2rem;margin:2.2rem 0 .6rem}
p,li{color:var(--muted)}
strong{color:var(--ink)}
a{color:var(--accent)}
.back{text-decoration:none;font-weight:700}
.todo{background:var(--warn);color:var(--warn-ink);padding:.05rem .35rem;border-radius:4px;font-weight:600}
.btn{display:inline-block;background:var(--accent);color:#fff;padding:.8rem 1.2rem;border-radius:999px;text-decoration:none;font-weight:700}
.updated{font-size:.88rem}