:root {
  color-scheme: light dark;
  --bg: #f7f8fc;
  --card: #ffffff;
  --text: #171824;
  --muted: #626574;
  --accent: #4355b9;
  --border: #e5e7ef;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101116;
    --card: #181920;
    --text: #f4f4f7;
    --muted: #a8a9b4;
    --border: #2c2d36;
  }
}

* {
  box-sizing: border-box;
}

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

.container {
  width: min(860px, calc(100% - 32px));
  margin: 48px auto;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 36px;
}

.brand {
  font-size: 34px;
  font-weight: 800;
}

.subtitle,
footer {
  color: var(--muted);
}

h2 {
  margin-top: 32px;
}

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

nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin: 28px 0;
}

footer {
  margin-top: 40px;
  font-size: 14px;
}