body { 
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
    display: flex; 
    justify-content: center; 
    align-items: center; 
    min-height: 100vh; /* Cambiato in min-height per evitare tagli su schermi piccoli */
    margin: 0; 
    background-color: #f0f2f5; 
}

.container { 
    text-align: center; 
    background: white; 
    padding: 40px; 
    border-radius: 20px; 
    box-shadow: 0 15px 35px rgba(0,0,0,0.1); 
    max-width: 400px; 
    width: 90%; 
    margin: 20px; /* Margine di sicurezza per il mobile */
}

.logo-img {
    max-width: 150px;
    height: auto;
    margin-bottom: 20px;
}

h1 { color: #1a1a1a; margin-bottom: 5px; font-size: 24px; text-transform: uppercase; }
p { color: #65676b; margin-bottom: 30px; font-size: 15px; letter-spacing: 1px; }

.btn { 
    display: block; 
    width: 100%; 
    padding: 16px 0; 
    margin: 15px 0; 
    text-decoration: none; 
    color: white; 
    border-radius: 12px; 
    font-weight: bold; 
    font-size: 16px; 
    transition: all 0.3s ease; 
    box-sizing: border-box;
}

.btn:hover { 
    opacity: 0.95; 
    transform: translateY(-3px); 
    box-shadow: 0 6px 20px rgba(0,0,0,0.15);
}

/* BLU ISTITUZIONALE PER IL GESTIONALE */
.btn-gestionale { 
    background-color: #0056b3; 
    box-shadow: 0 4px 14px rgba(0, 86, 179, 0.4);
}

/* GIALLO/ARANCIO PC PER L'AMMINISTRAZIONE */
.btn-nas { 
    background-color: #f39c12; 
    color: #ffffff; /* Testo bianco per contrasto */
    box-shadow: 0 4px 14px rgba(243, 156, 18, 0.3);
}

.footer { 
    margin-top: 25px; 
    font-size: 12px; 
    color: #888da8; 
    border-top: 1px solid #eee;
    padding-top: 15px;
    line-height: 1.6;
}

/* Ottimizzazione per Mobile */
@media (max-width: 480px) {
    .container { padding: 30px 20px; }
    h1 { font-size: 20px; }
    .btn { padding: 14px 0; font-size: 15px; }
}