body {
    font-family: '-apple-system', BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: #f2f2f7; /* Grigio chiaro tipico di iOS */
    color: #000;
    text-align: center;
    padding: 60px 20px;
    margin: 0;
}
.card {
    max-width: 400px;
    margin: 0 auto;
    background: #ffffff;
    padding: 40px 24px;
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}
.logo-placeholder {
    font-size: 40px;
    margin-bottom: 20px;
}
h1 { 
    color: #d00000; /* Il rosso fiammante del tuo header */
    font-size: 26px; 
    margin-bottom: 12px; 
    font-weight: 800;
}
p { 
    font-size: 16px; 
    color: #666; 
    margin-bottom: 32px; 
    line-height: 1.5; 
}
.btn {
    display: block;
    width: 100%;
    padding: 16px;
    margin-bottom: 12px;
    font-size: 18px;
    font-weight: bold;
    color: #fff;
    text-decoration: none;
    border-radius: 8px;
    box-sizing: border-box;
    transition: opacity 0.2s;
}
.btn:hover { opacity: 0.9; }
.btn-apple { background-color: #000000; }
.btn-android { background-color: #3ddc84; color: #000000; }