body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f6;
    margin: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

#reader-container {
    width: 60%;
    background: white;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    border-radius: 12px;
    transition: filter 0.5s ease, opacity 0.5s ease; /* Smooth blur transition */
}

/* This class is added by JavaScript when you look away */
.blurred {
    filter: blur(8px);
    opacity: 0.3;
}

#calibration-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.8);
    color: white;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

button {
    padding: 15px 30px;
    font-size: 18px;
    cursor: pointer;
    background: #2ecc71;
    border: none;
    color: white;
    border-radius: 5px;
}