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

html, body {
  height: 100%;
}

body {
  font-family: Arial, sans-serif;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  background: white;
}

header {
  background: black;
  color: white;
  padding: 0.7em 0;
  text-align: center;
}

header a {
  color: white;
  text-decoration: none;
  margin: 0 10px;
}

header a:hover {
  text-decoration: underline;
}

main p {
  margin-bottom: 1em;
}

main {
  flex: 1;
  max-width: 800px;
  margin: 2em auto;
  padding: 1em;
  width: 100%;
  white-space: normal;
}

footer {
  background: black;
  color: white;
  text-align: center;
  padding: 0.7em 0;
  margin-top: auto; /* keeps it at bottom when page is short */
}

main ul, main ol {
  margin-left: 0.5em;   /* indent lists neatly */
  padding-left: 0.5em;  /* ensures bullets/numbers align inside content */
}