:root {
  --bg-light: #f5f5f3;
  --bg-dark: #1e1e2f;
  --text-light: #1e1e1e;
  --text-dark: #f5f5f3;
  --accent: #c89f9c;
  --highlight: #88a2aa;
  --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
  font-family: var(--font-main);
  background-color: var(--bg-light);
  color: var(--text-light);
  margin: 0;
  padding: 0;
  transition: background-color 0.3s ease, color 0.3s ease;
}

header, footer {
  background-color: var(--highlight);
  color: var(--text-dark);
  padding: 1rem;
  text-align: center;
}

nav {
  display: flex;
  justify-content: center;
  gap: 1rem;
  background-color: var(--accent);
  padding: 0.5rem;
  position: sticky;
  top: 0;
  z-index: 1000;
}

nav a, nav button {
  color: var(--text-dark);
  text-decoration: none;
  font-weight: bold;
  background: none;
  border: none;
  cursor: pointer;
}

main {
  padding: 2rem;
}

footer {
  font-size: 0.9rem;
}

.dark-mode {
  background-color: var(--bg-dark);
  color: var(--text-dark);
}

.dark-mode header,
.dark-mode footer {
  background-color: #2d2d44;
  color: var(--text-light);
}

.dark-mode nav {
  background-color: #444;
}

.dark-mode nav a,
.dark-mode nav button {
  color: var(--text-light);
}