body {
    margin: 0;
    padding: 0;
    font-family: Arial, sans-serif;
    background: #f3f3f3;
    overflow-x: hidden;
}

/* Shake animation */
@keyframes shake {
    0% { transform: translate(0, 0); }
    20% { transform: translate(-10px, 10px); }
    40% { transform: translate(10px, -10px); }
    60% { transform: translate(-8px, 8px); }
    80% { transform: translate(8px, -8px); }
    100% { transform: translate(0, 0); }
}

.shake-screen {
    animation: shake 0.12s infinite;
}

/* SMALL POPUP */
#startPopup {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0,0,0,0.4);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

#popupBox {
    background: white;
    padding: 25px 35px;
    border-radius: 15px;
    box-shadow: 0px 4px 15px rgba(0,0,0,0.3);
    font-size: 20px;
    text-align: center;
    cursor: pointer;
}

/* Notes Box */
#pdfBox {
    background: white;
    padding: 25px;
    width: 90%;
    max-width: 700px;
    margin: 40px auto;
    line-height: 1.6;
    border: 1px solid #ccc;
    box-shadow: 0px 0px 10px rgba(0,0,0,0.2);
    display: none;
}

/* Ghost */
#ghost {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    object-fit: cover;
    z-index: 999999;
}