/* RESET */
*{
  margin:0;
  padding:0;
  box-sizing:border-box;
  font-family:Arial, sans-serif;
}

/* HEADER */
header{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:20px 40px;
  background:#222;
  color:white;
  position:sticky;
  top:0;
}

nav a{
  color:white;
  text-decoration:none;
  margin-left:20px;
  transition:0.3s;
}

nav a:hover{
  color:#00bcd4;
}

/* SECTIONS */
section{
  padding:60px 40px;
}

/* HERO */
.hero{
  height:60vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  text-align:center;
  background:#f4f4f4;
}

/* CARD */
.card-container{
  display:flex;
  gap:20px;
  flex-wrap:wrap;
}

.card{
  flex:1;
  min-width:220px;
  padding:20px;
  border:1px solid #ddd;
  border-radius:10px;
  background:white;
  transition:0.3s;
}

.card:hover{
  transform:translateY(-5px);
}

/* FOOTER */
footer{
  background:#222;
  color:white;
  text-align:center;
  padding:30px;
  margin-top:40px;
}

/* RESPONSIVE */
@media(max-width:768px){
  header{
    flex-direction:column;
  }

  nav{
    margin-top:10px;
  }

  .card-container{
    flex-direction:column;
  }
}