:root{--bg:#f7f8fb;--surface:#fff;--text:#0f172a;--muted:#5b6478;--border:#dde2ec;--primary:#1d4ed8}
@media (prefers-color-scheme: dark){:root:not([data-theme="light"]){--bg:#0a0f1c;--surface:#111827;--text:#e8edf7;--muted:#9aa5bd;--border:#243049;--primary:#3b82f6}}
:root[data-theme="dark"]{--bg:#0a0f1c;--surface:#111827;--text:#e8edf7;--muted:#9aa5bd;--border:#243049;--primary:#3b82f6}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--text);font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.7}
a{color:var(--primary)}
header{border-bottom:1px solid var(--border);background:var(--surface)}
.wrap{max-width:820px;margin:0 auto;padding:0 16px}
.nav{display:flex;justify-content:space-between;align-items:center;height:64px}
.logo{font-weight:800;font-size:1.15rem;color:var(--text);text-decoration:none}
main{padding:48px 0 64px}
h1{font-size:clamp(1.6rem,4vw,2.2rem);letter-spacing:-.02em;margin:0 0 6px}
.date{color:var(--muted);font-size:.9rem;margin-bottom:32px}
h2{font-size:1.15rem;margin:32px 0 8px}
p,li{color:var(--muted)}
.box{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:18px 22px}
footer{border-top:1px solid var(--border);padding:28px 0;color:var(--muted);font-size:.88rem}
footer a{margin-right:16px}