:root {
  --bg: #F8FAFC; --fg: #0F172A; --muted: #475569; --border: #CBD5E1;
  --card: #FFFFFF; --primary: #1E3A8A; --ring: #1E3A8A;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root { --bg: #0B1220; --fg: #E2E8F0; --muted: #94A3B8; --border: #334155; --card: #111A2E; --primary: #93C5FD; --ring: #93C5FD; }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
.wrap { max-width: 720px; margin: 0 auto; padding: 48px 20px 64px; }
header { margin-bottom: 32px; }
.brand { font-size: 15px; color: var(--muted); margin: 0 0 8px; }
h1 { font-family: Georgia, "Times New Roman", serif; font-weight: 600; font-size: 34px; line-height: 1.2; margin: 0 0 12px; }
h2 { font-family: Georgia, "Times New Roman", serif; font-weight: 600; font-size: 22px; margin: 36px 0 8px; }
p, li { max-width: 68ch; }
ul { padding-left: 22px; }
a { color: var(--primary); text-underline-offset: 3px; }
a:focus-visible { outline: 2px solid var(--ring); outline-offset: 3px; border-radius: 2px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 20px 24px; margin: 24px 0; }
nav { display: flex; flex-wrap: wrap; gap: 8px 20px; margin-top: 16px; }
nav a { display: inline-block; padding: 10px 0; min-height: 44px; }
.meta { color: var(--muted); font-size: 15px; }
footer { margin-top: 48px; padding-top: 20px; border-top: 1px solid var(--border); color: var(--muted); font-size: 15px; }
@media (max-width: 480px) { h1 { font-size: 28px; } .wrap { padding-top: 32px; } }