/* style.css */

body{
  background-image: url(retrofon.gif)
    margin:0;
    padding:0;
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #3498db, #2c3e50);
    min-height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
}

.contenedor{
    background:white;
    padding:30px;
    border-radius:15px;
    width:350px;
    text-align:center;
    box-shadow:0 5px 15px rgba(0,0,0,0.3);
}

h1{
    color:#333;
}

input{
    width:90%;
    padding:12px;
    margin:10px 0;
    border:1px solid #ccc;
    border-radius:8px;
    font-size:16px;
}

button{
    background:#3498db;
    color:white;
    border:none;
    padding:12px 20px;
    border-radius:8px;
    cursor:pointer;
    font-size:16px;
    transition:0.3s;
    margin-top:10px;
}

button:hover{
    background:#2980b9;
}

#resultado{
    margin-top:20px;
    font-size:18px;
    font-weight:bold;
    color:#222;
}

#historial{
    margin-top:15px;
    text-align:left;
    max-height:200px;
    overflow-y:auto;
}

.tarjeta{
    background:#f4f4f4;
    padding:10px;
    border-radius:10px;
    margin-bottom:10px;
}