:root {
  --bg: #0f1117;
  --panel: #1a1d27;
  --accent: #6ea8fe;
  --text: #e6e8ee;
  --muted: #9aa0ad;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  background: var(--panel);
  border-bottom: 1px solid #2a2e3a;
}

nav {
  display: flex;
  gap: 0.5rem;
  padding: 1rem;
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.4rem 0.9rem;
  border-radius: 6px;
  font-weight: 500;
  transition: background 0.15s, color 0.15s;
}

nav a:hover { color: var(--text); background: #232735; }

nav a.active {
  color: #fff;
  background: var(--accent);
}

main {
  flex: 1;
  max-width: 720px;
  margin: 0 auto;
  width: 100%;
  padding: 2rem 1rem;
}

h1 { margin-top: 0; }

.card {
  background: var(--panel);
  border: 1px solid #2a2e3a;
  border-radius: 10px;
  padding: 1.25rem 1.5rem;
  margin: 1rem 0;
}

.card code {
  background: #0b0d13;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  color: var(--accent);
}

button {
  background: var(--accent);
  color: #0b0d13;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
}

button:hover { filter: brightness(1.1); }

footer {
  border-top: 1px solid #2a2e3a;
  padding: 0.75rem 1rem;
  text-align: center;
  color: var(--muted);
}

dl { margin: 0; }
dt { color: var(--muted); font-size: 0.85rem; margin-top: 0.6rem; }
dd { margin: 0.1rem 0 0; font-family: monospace; word-break: break-all; }