.iv-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100000;
    background: rgba(0, 0, 0, 0.92);
    display: none;
    flex-direction: column;
    user-select: none;
    -webkit-user-select: none;
    touch-action: none;
}

.iv-overlay.iv-visible {
    display: flex;
}

.iv-toolbar {
    display: flex;
    align-items: center;
    padding: 4px 12px;
    z-index: 2;
}

.iv-counter {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
    min-width: 50px;
}

.iv-btn {
    background: none;
    border: none;
    color: #fff;
    cursor: pointer;
    font-size: 20px;
    min-width: 44px;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.8;
    transition: opacity 0.2s;
    line-height: 1;
    padding: 0;
}

.iv-btn:hover:not(:disabled) {
    opacity: 1;
}

.iv-btn:disabled {
    opacity: 0.3;
    cursor: default;
}

.iv-btn-zoom {
    font-size: 22px;
    font-weight: bold;
}

.iv-btn-close {
    font-size: 24px;
}

.iv-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.iv-spinner {
    position: absolute;
    width: 36px;
    height: 36px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: rgba(255, 255, 255, 0.8);
    border-radius: 50%;
    animation: iv-spin 0.8s linear infinite;
}

@keyframes iv-spin {
    to { transform: rotate(360deg); }
}

.iv-img {
    max-width: 90%;
    max-height: 100%;
    object-fit: contain;
    will-change: transform;
    position: relative;
}

.iv-img.iv-fade {
    transition: opacity 0.2s;
}

.iv-btn-prev,
.iv-btn-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    z-index: 2;
    font-size: 28px;
    min-width: 48px;
    min-height: 64px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 4px;
}

.iv-btn-prev {
    left: 4px;
}

.iv-btn-next {
    right: 4px;
}

.iv-caption {
    text-align: center;
    padding: 10px 16px;
    color: #fff;
    font-size: 14px;
    font-weight: 500;
    word-break: break-word;
    overflow-wrap: break-word;
    background: rgba(0, 0, 0, 0.4);
    z-index: 2;
}

/* Hide nav arrows on touch devices - use swipe instead */
@media (pointer: coarse) {
    .iv-btn-prev,
    .iv-btn-next {
        display: none;
    }
}