:root{--bg:#ffffff;--fg:#1a1a1a;--muted:#555;--line:#e3e3e3;--accent:#0b4f8a}
@media (prefers-color-scheme:dark){:root{--bg:#121417;--fg:#ececec;--muted:#a8a8a8;--line:#2c3036;--accent:#7fb6ea}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--fg);font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif}
header,main,footer{max-width:820px;margin:0 auto;padding:0 16px}
header{padding-top:28px;padding-bottom:12px;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;align-items:baseline;flex-wrap:wrap;gap:8px}
header a.brand{font-weight:700;font-size:20px;color:var(--fg);text-decoration:none}
header nav a{margin-left:16px;color:var(--accent);text-decoration:none}
header nav a:first-child{margin-left:0}
main{padding-top:24px;padding-bottom:40px}
h1{font-size:30px;line-height:1.25;margin:8px 0}
h2{font-size:21px;margin-top:32px}
a{color:var(--accent)}
img{max-width:100%;height:auto;border:1px solid var(--line)}
.box{border:1px solid var(--line);border-radius:8px;padding:14px 16px}
footer{border-top:1px solid var(--line);padding-top:16px;padding-bottom:32px;color:var(--muted);font-size:14px}
footer a{margin-right:14px}