/* --------------------------------------------
   Base Layout & Typography
--------------------------------------------- */
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
  font-family: Arial, sans-serif;
  display: flex;
  flex-direction: column;
  background-color: #f0f2f5;
  color: #333;
  line-height: 1.6;
}

/* --------------------------------------------
   Header & Navigation
--------------------------------------------- */
header {
  background-color: #1a252f;
  color: white;
  text-align: center;
  padding: 1em 0;
}

nav {
  background-color: #2c3e50;
  padding: 1em;
  position: sticky;
  top: 0;
  z-index: 100;
}

nav a {
  color: white;
  text-decoration: none;
  margin: 0 1.5em;
  font-weight: bold;
}

nav a:hover {
  color: white;
  text-decoration: underline;
}


/* --------------------------------------------
   Footer
--------------------------------------------- */
footer {
  text-align: center;
  padding: 1em;
  background-color: #1a252f;
  color: white;
  margin-top: auto;
}