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

body{
    background:#f4f8fb;
    color:#333;
    line-height:1.6;
}

header{
    background:linear-gradient(135deg,#2196F3,#00BCD4);
    color:white;
    text-align:center;
    padding:40px 20px;
}

header a{
    color:white;
    text-decoration:none;
    font-weight:bold;
}

header h1{
    margin-top:20px;
    margin-bottom:15px;
    font-size:2.3rem;
}

header p{
    max-width:700px;
    margin:auto;
}

.calculadora{
    max-width:650px;
    margin:40px auto;
    background:white;
    padding:30px;
    border-radius:15px;
    box-shadow:0 8px 25px rgba(0,0,0,.12);
}

label{
    display:block;
    margin-top:20px;
    margin-bottom:8px;
    font-weight:bold;
}

input,
select{
    width:100%;
    padding:14px;
    border:1px solid #ccc;
    border-radius:10px;
    font-size:16px;
}

button{
    width:100%;
    margin-top:20px;
    padding:15px;
    border:none;
    border-radius:10px;
    cursor:pointer;
    font-size:17px;
    font-weight:bold;
    transition:.3s;
}

button:first-of-type{
    background:#2196F3;
    color:white;
}

button:first-of-type:hover{
    background:#1976D2;
}

button:last-of-type{
    background:#e0e0e0;
}

button:last-of-type:hover{
    background:#cfcfcf;
}

#resultado{
    margin-top:30px;
    display:none;
    background:#E3F2FD;
    border-left:6px solid #2196F3;
    padding:20px;
    border-radius:10px;
}

footer{
    margin-top:50px;
    text-align:center;
    padding:25px;
    background:#222;
    color:white;
}

@media(max-width:768px){

header h1{
    font-size:1.8rem;
}

.calculadora{
    margin:20px;
    padding:20px;
}

}
.resultado-card{

    text-align:center;

}

.litros{

    font-size:55px;
    color:#2196F3;
    font-weight:bold;
    margin:20px 0;

}

.vasos{

    font-size:20px;
    margin-bottom:20px;

}

.barra{

    width:100%;
    height:22px;
    background:#dbefff;
    border-radius:20px;
    overflow:hidden;
    margin:25px 0;

}

.barra-progreso{

    height:100%;
    background:linear-gradient(90deg,#00BCD4,#2196F3);
    transition:.6s;

}

.mensaje{

    font-size:18px;
    margin:20px 0;

}

.info{

    margin-top:20px;
    padding:18px;
    background:#E3F2FD;
    border-radius:10px;

}
.informacion{

    max-width:900px;
    margin:50px auto;
    background:white;
    padding:35px;
    border-radius:15px;
    box-shadow:0 5px 20px rgba(0,0,0,.08);

}

.informacion h2{

    color:#2196F3;
    margin-bottom:20px;
    margin-top:25px;

}

.informacion p{

    margin-bottom:18px;

}

.informacion ul{

    margin-left:25px;

}

.informacion li{

    margin-bottom:12px;

}
.faq{

    max-width:900px;
    margin:50px auto;
    background:white;
    padding:35px;
    border-radius:15px;
    box-shadow:0 5px 20px rgba(0,0,0,.08);

}

.faq h2{

    color:#2196F3;
    margin-bottom:30px;

}

.faq-item{

    margin-bottom:25px;
    padding-bottom:20px;
    border-bottom:1px solid #ddd;

}

.faq-item:last-child{

    border-bottom:none;

}

.faq-item h3{

    margin-bottom:10px;
    color:#333;

}

.faq-item p{

    color:#555;
    line-height:1.7;

}
.relacionadas{

max-width:900px;
margin:50px auto;
background:white;
padding:35px;
border-radius:15px;
box-shadow:0 5px 20px rgba(0,0,0,.08);
text-align:center;

}

.relacionadas h2{

margin-bottom:25px;
color:#2196F3;

}

.relacionadas a{

display:block;
margin:12px 0;
padding:15px;
background:#2196F3;
color:white;
text-decoration:none;
border-radius:10px;
transition:.3s;

}

.relacionadas a:hover{

background:#1976D2;

}