:root {
  --color-bg: #ffffff;
  --color-text: #1a1a1a;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
}

header, main, footer {
  padding: 1.5rem;
}