#av-overlay {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    display: none; /* hidden by default */
    justify-content: center;
    align-items: center;
    z-index: 9999;
    background: rgba(0,0,0,0.8);
    box-sizing: border-box;
    padding: 20px;
}
#av-popup {
    background: #fff;
    padding: 30px;
    border-radius: 10px;
    text-align: center;
    max-width: 420px;
    width: 100%;
    box-sizing: border-box;
    box-shadow: 0 8px 20px rgba(0,0,0,0.2);
}
#av-popup h2 { margin-top: 0; margin-bottom: 10px; }
#av-popup p { margin-bottom: 15px; }
#av-popup button {
    padding: 10px 20px;
    margin: 10px;
    border: none;
    cursor: pointer;
    font-size: 16px;
    border-radius: 5px;
    color: white;
}
.av-logo {
    max-width: 120px;
    margin-bottom: 15px;
}

/* Responsive tweaks */
@media (max-width: 480px) {
    #av-popup {
        max-width: 90% !important;
        width: 90% !important;
        padding: 20px !important;
    }
    #av-popup h2 {
        font-size: 18px !important;
    }
    #av-popup button {
        width: 100% !important;
        margin: 8px 0 !important;
        font-size: 14px !important;
    }
}