body {
  font-family: Arial, sans-serif;
  margin: 0;
  transition: background 0.3s, color 0.3s;
}
.dark {
  background-color: #0f0f0f;
  color: white;
}
.center {
  text-align: center;
  padding: 4rem 2rem;
}
.button-group a {
  margin: 0.5rem;
  padding: 0.5rem 1rem;
  border: 1px solid white;
  color: white;
  text-decoration: none;
  border-radius: 9999px;
  transition: 0.3s;
}
.button-group a:hover {
  background: white;
  color: black;
}
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  padding: 2rem;
}
.card {
  background: #1f1f1f;
  padding: 1rem;
  border-radius: 1rem;
}
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px, 1fr));
  gap: 1rem;
  justify-items: center;
  margin-top: 1rem;
}
.tech-grid div {
  display: flex;
  flex-direction: column;
  align-items: center;
}
#darkModeToggle {
  position: fixed;
  top: 1rem;
  right: 1rem;
  padding: 0.5rem;
  font-size: 1.2rem;
  cursor: pointer;
  background: transparent;
  border: none;
}