:root {
  color-scheme: light dark;
  --bg: #0f1720;
  --fg: #e6edf3;
  --muted: #9aa7b2;
  --accent: #4fd1c5;
  --card: #161f2b;
  --border: #263244;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
}

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

header.site {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 1.5rem 1.25rem 0;
  max-width: 720px;
  margin: 0 auto;
}

.mark {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--accent);
  color: #0f1720;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.brand {
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
}

h1 {
  font-size: 1.6rem;
  margin-top: 0.5rem;
}

h2 {
  font-size: 1.15rem;
  margin-top: 2rem;
  color: var(--fg);
}

p, li {
  color: var(--muted);
}

a {
  color: var(--accent);
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-top: 1.5rem;
}

.btn {
  display: inline-block;
  margin-top: 1.25rem;
  padding: 0.7rem 1.4rem;
  background: var(--accent);
  color: #0f1720;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
}

footer.site {
  max-width: 720px;
  margin: 0 auto;
  padding: 1.25rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.updated {
  font-size: 0.85rem;
  color: var(--muted);
}