.tt-file-gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
}

.tt-file-gallery-item {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    cursor: pointer;
}

.tt-file-gallery-thumbnail {
    width: 100%;
    height: 100px;
    object-fit: cover;
    border-radius: 0.25rem;
    border: 1px solid #dee2e6;
    transition: transform 0.2s;
}

.tt-file-gallery-item:hover .tt-file-gallery-thumbnail {
    transform: scale(1.05);
}

.tt-file-gallery-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 40px; /* Adjust to not cover filename */
    background: rgba(0, 0, 0, 0.4);
    color: white;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.2s;
    pointer-events: none;
    border-radius: 0.25rem;
}

.tt-file-gallery-item:hover .tt-file-gallery-overlay {
    opacity: 1;
}

.tt-file-gallery-icon-container {
    width: 100%;
    height: 100px;
    display: flex;
    justify-content: center;
    align-items: center;
    border: 1px solid #dee2e6;
    border-radius: 0.25rem;
    background-color: #f8f9fa;
    text-decoration: none;
    color: inherit;
}

.tt-file-gallery-filename {
    font-size: 0.8rem;
    margin-top: 0.5rem;
    width: 100%;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    padding: 0 4px;
}

/* --- Fullscreen Viewer Styles --- */

.tt-fullscreen-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.85);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 9999;
    outline: none;
}

.tt-fullscreen-toolbar {
    position: absolute;
    top: 0;
    right: 0;
    padding: 15px;
    display: flex;
    gap: 15px;
    z-index: 10001;
}

.tt-fullscreen-btn {
    background: rgba(0, 0, 0, 0.3);
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    transition: background-color 0.2s;
}

.tt-fullscreen-btn:hover {
    background: rgba(0, 0, 0, 0.6);
}

.tt-fullscreen-content {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.tt-fullscreen-image-wrapper {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden; /* Important for panning */
}

.tt-fullscreen-image {
    max-width: 95vw;
    max-height: 95vh;
    object-fit: contain;
    will-change: transform; /* Performance hint for browser */
}

.tt-fullscreen-pdf {
    width: calc(100vw - 40px);
    height: calc(100vh - 40px);
    max-width: 1600px; /* Optional: max width for very large screens */
    border: none;
    background-color: white;
}

.tt-fullscreen-nav-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.3);
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
    padding: 10px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: background-color 0.2s;
}

.tt-fullscreen-nav-btn:hover {
    background: rgba(0, 0, 0, 0.6);
}

.tt-fullscreen-nav-btn.left {
    left: 15px;
}

.tt-fullscreen-nav-btn.right {
    right: 15px;
}