body{
  margin:0;
  font-family:Arial,sans-serif;
  background:#f5f7fa;
  color:#222;
}

.header{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:20px 40px;
  background:white;
  box-shadow:0 2px 10px rgba(0,0,0,0.05);
}

.logo{
  font-size:24px;
  font-weight:bold;
  color:#1f7cff;
}

nav a{
  margin-left:20px;
  text-decoration:none;
  color:#333;
}

.hero{
  text-align:center;
  padding:100px 20px;
}

.hero h1{
  font-size:48px;
  margin-bottom:10px;
}

.hero p{
  font-size:18px;
  margin-bottom:30px;
}

select,
input{
  width:100%;
  max-width:350px;
  padding:12px;
  margin:10px auto;
  display:block;
  border:1px solid #ccc;
  border-radius:8px;
}

button{
  padding:12px 20px;
  border:none;
  border-radius:8px;
  background:#1f7cff;
  color:white;
  cursor:pointer;
  margin-top:10px;
}

.modal{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:100%;
  background:rgba(0,0,0,0.7);
  display:flex;
  align-items:center;
  justify-content:center;
}

.modal-box{
  background:white;
  padding:30px;
  border-radius:12px;
  width:90%;
  max-width:400px;
}

.hidden{
  display:none;
}

#result{
  margin-top:15px;
  font-weight:bold;
}