:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --surface: #f6f7f9;
  --text: #16181d;
  --muted: #5c626e;
  --border: #e3e6ea;
  --accent: #2f6df6;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --surface: #171a20;
    --text: #e8eaed;
    --muted: #a0a6b1;
    --border: #262a32;
    --accent: #6b9bff;
  }
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
}

.wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 20px 96px;
}

header.site {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

header.site .wrap {
  padding: 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.brand {
  font-weight: 700;
  letter-spacing: -0.01em;
  text-decoration: none;
  color: var(--text);
}

nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 18px;
  font-size: 15px;
}

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

h1 {
  font-size: 2rem;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}

h2 {
  font-size: 1.2rem;
  margin: 40px 0 12px;
  letter-spacing: -0.01em;
}

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

.meta {
  color: var(--muted);
  font-size: 15px;
  margin: 0 0 32px;
}

ul { padding-left: 22px; }
li { margin-bottom: 8px; }

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

.callout {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px 20px;
  margin: 24px 0;
}

.callout p { margin: 0; }

footer.site {
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

footer.site .wrap { padding: 24px 20px; }

.cards {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  margin-top: 32px;
}

.card {
  display: block;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px;
  text-decoration: none;
  color: var(--text);
  background: var(--surface);
}

.card:hover { border-color: var(--accent); }

.card strong { display: block; margin-bottom: 4px; }
.card span { color: var(--muted); font-size: 15px; }