/* Reset & Base */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  font-family: system-ui, sans-serif;
  line-height: 1.6;
  color: #222;
  background: #fff;
  max-width: 900px;
  margin: auto;
  padding: 0 1rem;
}

/* Header/Nav */
header {
  padding: 2rem 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
nav a {
  margin-left: 1rem;
  text-decoration: none;
  color: #444;
  font-weight: 500;
}
nav a:hover {
  color: #0077ff;
}

/* Main content */
main {
  margin-top: 2rem;
}

/* Footer */
footer {
  margin-top: 3rem;
  padding: 1rem 0;
  font-size: 0.85rem;
  color: #666;
  text-align: center;
}