/* =========================================================
   STUDY GUIDE - EXPANDABLE IMAGES
   ========================================================= */

.study-image-expandable {
    cursor: zoom-in;
}

/* Full-screen overlay */
.study-image-lightbox {
    display: none;
    position: fixed;
    z-index: 99999;
    inset: 0;

    background: rgba(3, 10, 18, 0.94);

    align-items: center;
    justify-content: center;

    padding: 30px;
}

/* Displayed state */
.study-image-lightbox.active {
    display: flex;
}

/* Enlarged image */
.study-image-lightbox img {
    display: block;

    width: auto;
    height: auto;

    max-width: 96vw;
    max-height: 94vh;

    object-fit: contain;

    box-shadow: 0 0 35px rgba(0, 190, 255, 0.25);
}

/* Close button */
.study-image-lightbox-close {
    position: absolute;
    top: 14px;
    right: 22px;

    border: 0;
    background: transparent;

    color: #ffffff;
    font-size: 42px;
    font-weight: 300;
    line-height: 1;

    cursor: pointer;

    opacity: 0.8;
}

.study-image-lightbox-close:hover {
    opacity: 1;
}

/* Slight visual cue on desktop */
@media (hover: hover) {

    .study-image-expandable {
        transition: opacity 0.2s ease;
    }

    .study-image-expandable:hover {
        opacity: 0.92;
    }

}

/* Smaller screens */
@media (max-width: 768px) {

    .study-image-lightbox {
        padding: 10px;
    }

    .study-image-lightbox img {
        max-width: 98vw;
        max-height: 90vh;
    }

    .study-image-lightbox-close {
        top: 8px;
        right: 12px;
        font-size: 36px;
    }

}