.image-modal {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 50;
    overflow: hidden;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.image-modal.active {
    opacity: 1;
}

.image-wrapper {
    display: flex;
    height: 100%;
    transition: transform 0.3s ease;
    will-change: transform;
}

.image-wrapper img {
    width: 100%;       /* ✅ กว้างเต็ม container */
    height: auto;
    max-width: 100vw;  /* ✅ ไม่ให้เกินจอ */
    max-height: 90vh;  /* ✅ ไม่ให้เกินจอแนวตั้ง */
    object-fit: contain;
    flex-shrink: 0;    /* ✅ ไม่บีบ */
    background: #000;
}

.image-modal .close-btn,
.image-modal .prev-btn,
.image-modal .next-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 3rem;
    color: white;
    cursor: pointer;
    user-select: none;
}
.image-modal .close-btn {
    top: 20px;
    right: 30px;
    transform: none;
}
.image-modal .prev-btn { left: 30px; }
.image-modal .next-btn { right: 30px; }