*{
  margin:0;
  padding:0;
  box-sizing:border-box;
}

body{
  background:#050505;
  color:#fff;
  font-family:'Montserrat',sans-serif;
  min-height:100vh;
}

.contenedor{
  max-width:700px;
  margin:60px auto;
  padding:20px;
}

h1{
  text-align:center;
  margin-bottom:30px;
  font-family:'Oswald',sans-serif;
  font-size:48px;
  color:#fff;
}

input{
  width:100%;
  padding:18px;
  background:#101010;
  border:1px solid #252525;
  border-radius:14px;
  color:white;
  font-size:16px;
  margin-bottom:15px;
}

input:focus{
  outline:none;
  border-color:#2563eb;
  box-shadow:0 0 10px rgba(37,99,235,.35);
}

button{
  width:100%;
  padding:18px;
  background:#2563eb;
  color:white;
  border:none;
  border-radius:14px;
  font-size:18px;
  font-weight:800;
  cursor:pointer;
  transition:.2s;
}
button:hover{
  transform:translateY(-2px);
  opacity:.95;
}

#resultado{
  margin-top:30px;
}

.compra-card{
  background:#101010;
  border:1px solid #252525;
  border-radius:18px;
  padding:20px;
  margin-bottom:20px;
}

.compra-card h3{
  color:#2563eb;
  margin-bottom:12px;
}
.compra-card p{
  margin-bottom:8px;
  line-height:1.5;
}

.numeros{
  margin-top:15px;
  padding:15px;
  background:#0b0b0b;
  border:1px solid #1f1f1f;
  border-radius:12px;
  font-weight:700;
  color:#2563eb;
  word-break:break-word;
}

.compra-card{
  box-shadow:0 0 15px rgba(37,99,235,.15);
}
@media(max-width:768px){

  .contenedor{
    margin:30px auto;
    padding:15px;
  }

  h1{
    font-size:34px;
  }

}