*{
  box-sizing:border-box;
  font-family:Arial, Helvetica, sans-serif;
}

body{
  margin:0;
  background:#f4f6f8;
  color:#333;
}

header{
  background:#111;
  padding:15px 30px;
}

header h1{
  color:#fff;
  margin:0;
  display:inline-block;
}

nav{
  float:right;
}

nav a{
  color:#fff;
  margin-left:15px;
  text-decoration:none;
  font-weight:bold;
}

.container{
  max-width:1100px;
  margin:auto;
  padding:40px 20px;
}

.hero{
  background:#2c3e50;
  color:#fff;
  padding:80px 20px;
  text-align:center;
}

.hero h2{
  font-size:36px;
  margin-bottom:20px;
}

.hero p{
  font-size:18px;
}

.btn{
  display:inline-block;
  margin-top:25px;
  padding:12px 25px;
  background:#27ae60;
  color:#fff;
  text-decoration:none;
  border-radius:4px;
}

.cards{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(250px,1fr));
  gap:20px;
}

.card{
  background:#fff;
  padding:25px;
  border-radius:6px;
  box-shadow:0 2px 5px rgba(0,0,0,0.1);
}

footer{
  background:#111;
  color:#aaa;
  text-align:center;
  padding:15px;
  margin-top:40px;
}