:root {
  color-scheme: light dark;
  --bg: #f7f8fb;
  --text: #1c1f26;
  --muted: #5a6170;
  --accent: #1f5fbf;
  --card: #ffffff;
  --line: #e2e5ec;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1220;
    --text: #e8ebf2;
    --muted: #a3abbd;
    --accent: #7fb0ff;
    --card: #161d30;
    --line: #273049;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

main {
  max-width: 680px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 24px;
}

header img {
  width: 56px;
  height: 56px;
  border-radius: 13px;
}

header a {
  color: inherit;
  text-decoration: none;
  font-size: 22px;
  font-weight: 700;
}

h1 { font-size: 30px; line-height: 1.2; margin: 0 0 8px; }
h2 { font-size: 20px; margin: 32px 0 8px; }
p, li { color: var(--text); }
.muted { color: var(--muted); }
a { color: var(--accent); }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 4px 20px;
  margin: 16px 0;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 15px;
}

footer { margin-top: 16px; font-size: 14px; color: var(--muted); }