:root {
  color-scheme: light dark;
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --primary: #4f46e5;
  --line: #e2e8f0;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --surface: #111a2e;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --line: #1e293b;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", "Inter", "Roboto", sans-serif;
  line-height: 1.6;
}

.wrap {
  max-width: 860px;
  margin: 0 auto;
  padding: 24px 16px 48px;
}

header {
  margin-bottom: 24px;
}

h1 {
  margin: 0 0 8px;
  font-size: 2rem;
  line-height: 1.2;
}

h2 {
  margin-top: 24px;
  font-size: 1.25rem;
}

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

.muted {
  color: var(--muted);
}

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 18px;
  margin-top: 12px;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

nav {
  display: flex;
  gap: 12px;
  margin-top: 10px;
}

footer {
  margin-top: 28px;
  color: var(--muted);
  font-size: 0.9rem;
}