:root {
  --bg: #0f1115;
  --fg: #e8eaed;
  --muted: #9aa0a6;
  --accent: #5b9bff;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
}

body {
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

main {
  width: 100%;
  max-width: 36rem;
}

h1 {
  margin: 0;
  font-size: 2.5rem;
  letter-spacing: -0.02em;
}

.subtitle {
  margin: 0.5rem 0 2rem;
  color: var(--muted);
  font-size: 1.05rem;
}

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

nav li + li { margin-top: 0.75rem; }

nav a {
  display: block;
  padding: 1rem 1.25rem;
  background: #181b22;
  border: 1px solid #262a33;
  border-radius: 0.75rem;
  color: var(--fg);
  text-decoration: none;
  font-size: 1.1rem;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.15s ease;
}

nav a:hover {
  border-color: var(--accent);
  background: #1d212a;
  transform: translateY(-1px);
}