:root {
  --bg: #F3F5FA;
  --card: #FFFFFF;
  --text: #0A0E1A;
  --muted: #5B6478;
  --accent: #007A63;
  --border: #E2E6EF;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0A0E1A;
    --card: #1A2235;
    --text: #F0F4FF;
    --muted: #9AA4BF;
    --accent: #00D4AA;
    --border: #2A3449;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}
header {
  max-width: 820px;
  margin: 0 auto;
  padding: 32px 16px 8px;
  display: flex;
  align-items: center;
  gap: 12px;
}
header .logo {
  width: 44px; height: 44px; border-radius: 50%;
  background: #007A63; display: grid; place-items: center;
  color: #fff; font-weight: 700; font-size: 20px;
}
header a { color: var(--text); text-decoration: none; font-weight: 700; font-size: 22px; }
nav { max-width: 820px; margin: 0 auto; padding: 0 16px; display: flex; gap: 16px; flex-wrap: wrap; }
nav a { color: var(--accent); text-decoration: none; font-weight: 600; }
main {
  max-width: 820px;
  margin: 16px auto 48px;
  padding: 28px 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
}
h1 { font-size: 28px; line-height: 1.25; margin: 0 0 4px; }
h2 { font-size: 19px; margin: 32px 0 8px; }
.updated { color: var(--muted); margin: 0 0 24px; }
p, li { color: var(--text); }
ul { padding-left: 22px; }
a { color: var(--accent); }
.muted { color: var(--muted); }
footer { max-width: 820px; margin: 0 auto 32px; padding: 0 16px; color: var(--muted); font-size: 14px; }
@media (max-width: 600px) {
  main { padding: 20px 16px; border-radius: 12px; }
  h1 { font-size: 24px; }
}