:root { --bg: #f7f8fa; --fg: #1c2430; --muted: #5b6676; --card: #fff; --line: #e1e5eb; --accent: #1f3a5f; }
@media (prefers-color-scheme: dark) {
  :root { --bg: #11161d; --fg: #e6ebf1; --muted: #9aa6b5; --card: #19202a; --line: #2a3340; --accent: #8fb4e3; }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--fg); font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
main { max-width: 720px; margin: 0 auto; padding: 48px 16px 64px; }
header { display: flex; align-items: center; gap: 16px; margin-bottom: 32px; }
header img { width: 56px; height: 56px; border-radius: 12px; }
h1 { margin: 0; font-size: 1.8rem; line-height: 1.2; }
h2 { margin-top: 2em; font-size: 1.2rem; }
.tag { margin: 2px 0 0; color: var(--muted); }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 4px 24px; }
a { color: var(--accent); }
footer { margin-top: 48px; padding-top: 16px; border-top: 1px solid var(--line); color: var(--muted); font-size: 0.9rem; }
footer a { margin-right: 16px; }