:root {
  color-scheme: dark;
  --bg: #041010;
  --surface: #0f2222;
  --text: #e8f4f3;
  --muted: #9bb8b5;
  --accent: #6acfc7;
  --border: rgba(106, 207, 199, 0.2);
}

* {
  box-sizing: border-box;
}

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

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

header {
  border-bottom: 1px solid var(--border);
  padding: 1rem 1.25rem;
}

header nav {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
}

.brand {
  font-weight: 800;
  color: var(--accent);
  text-decoration: none;
  margin-right: auto;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 1.5rem;
  margin-top: 1rem;
}

h1 {
  font-size: 2rem;
  margin: 0 0 0.5rem;
  color: var(--accent);
}

h2 {
  font-size: 1.15rem;
  margin-top: 1.5rem;
}

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

footer {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem 2rem;
  color: var(--muted);
  font-size: 0.9rem;
}