* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

:root {
  color-scheme: light dark;

  --background-color: light-dark(#f9f9f9, #1e1e1e);
  --background-color-variant: light-dark(#fff, #2c2c2c);
  --text-color: light-dark(#333, #ddd);
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);

  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100svh;
}

header {
  background-color: var(--background-color-variant);
  padding: 1rem 2rem;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);

  a {
    text-decoration: none;
    color: inherit;
    font-weight: bold;
    font-size: 1.25rem;
  }
}

main {
  padding: 2rem;
}

.content {
  width: 100%;
  max-width: 900px;
  margin: auto;
}

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