body{
    font-family:Arial, sans-serif;
    margin:0;
    background:#f4f8fc;
    font-size:18px;
    line-height:1.7;
}

header{
    background:linear-gradient(135deg,#2563eb,#22c55e);
    padding:100px 20px;
    color:#fff;
    text-align:center;
}

header h1{
    font-size:56px;
    margin-bottom:20px;
    font-weight:700;
}

header p{
    font-size:24px;
    max-width:700px;
    margin:auto;
    opacity:.95;
}

.card{
    max-width:800px;
    margin:40px auto;
    background:#fff;
    padding:40px;
    border-radius:20px;
    box-shadow:0 10px 30px rgba(0,0,0,.1);
    text-align:center;
}

.card h2{
    font-size:100px;
    margin-bottom:25px;
}

.card p{
    font-size:20px;
    color:#555;
}

label{
    display:block;
    font-size:22px;
    font-weight:600;
    margin:20px 0 10px;
}

input[type="file"]{
    font-size:20px;
    margin:20px 0;
}

input[type="range"]{
    width:100%;
    margin:20px 0;
}

img{
    max-width:100%;
    margin:25px auto;
    border-radius:12px;
}

button,
a{
    display:block;
    width:100%;
    max-width:350px;
    margin:25px auto;
    padding:18px 30px;
    background:#2563eb;
    color:#fff;
    text-decoration:none;
    border:none;
    border-radius:50px;
    font-size:22px;
    font-weight:600;
    cursor:pointer;
    transition:.3s;
}

button:hover,
a:hover{
    background:#1d4ed8;
    transform:translateY(-3px);
}

#sizes{
    font-size:20px;
    font-weight:600;
    color:#0f172a;
    margin-top:20px;
}

/* Mobile */
@media (max-width:768px){

header{
    padding:70px 20px;
}

header h1{
    font-size:38px;
}

header p{
    font-size:20px;
}

.card{
    margin:20px;
    padding:25px;
}

button,
a{
    font-size:20px;
}

}