:root { color-scheme: light dark; }
* { box-sizing: border-box; }
body { margin: 0; color: #253447; background: #f7f9fc; font: 15px/1.85 system-ui, 'Malgun Gothic', sans-serif; word-break: keep-all; overflow-wrap: anywhere; }
main { max-width: 760px; margin: 32px auto; padding: 28px; background: white; border: 1px solid #dbe2eb; border-radius: 16px; }
a { color: #2563eb; }
h1 { font-size: 26px; line-height: 1.5; }
h2 { margin-top: 28px; font-size: 18px; }
li { margin-bottom: 8px; }
ul { padding-left: 22px; }
.date { color: #586777; font-size: 13px; }
a:focus-visible { outline: 3px solid #2563eb; outline-offset: 3px; }
@media (max-width: 600px) {
  main { margin: 12px; padding: 20px; }
  h1 { font-size: 23px; }
}
@media (prefers-color-scheme: dark) {
  body { color: #e6edf6; background: #0e1623; }
  main { background: #192536; border-color: #354358; }
  a { color: #8eb7ff; }
  .date { color: #a7b5c7; }
}