:root{--navy:#0B1F3A;--brand:#0B3D91;--paper:#F5F7FA;--line:#D5DCE5;--muted:#4A5B70;--sun:#FFD166}
*{box-sizing:border-box}
body{margin:0;background:var(--paper);color:var(--navy);font:16px/1.6 'IBM Plex Sans',system-ui,sans-serif}
header{background:var(--navy);color:#fff;padding:18px 16px;border-bottom:5px solid var(--sun)}
header a{color:#fff;text-decoration:none;font-weight:700;font-size:18px}
main{max-width:720px;margin:0 auto;padding:28px 16px 64px}
h1{font-size:30px;line-height:1.2;margin:0 0 6px}
h2{font-size:19px;margin:32px 0 8px}
.updated{color:var(--muted);font-size:14px;margin:0 0 24px}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px;margin:16px 0}
a{color:var(--brand)}
code{font-family:'IBM Plex Mono',ui-monospace,monospace;font-size:14px}
ul{padding-left:20px}
footer{max-width:720px;margin:0 auto;padding:0 16px 40px;color:var(--muted);font-size:14px}