body {
    background: #ffffff;
    font-family: "Times New Roman", serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.window {
    background: #f7f7f7;
    width: 360px;
    border: 1px solid #000;
}

.title-bar {
    background: #000;
    color: white;
    padding: 8px 12px;
    font-size: 18px;
}

.content {
    padding: 25px;
    text-align: center;
}

.content h2 {
    font-size: 22px;
    font-weight: normal;
    margin-bottom: 25px;
}

/* Loading spinner (quarter-circle arc) */
.loader {
    width: 45px;
    height: 45px;
    border: 5px solid transparent;
    border-top-color: #000;
    border-left-color: #000;
    border-radius: 50%;
    margin: 0 auto;

    animation: spin 0.9s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}