/* ===================================================================
   TƯ LIỆU (MEDIA) PAGE SPECIFIC STYLES
   =================================================================== */

.gallery-filter {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
    overflow-x: auto;
    padding-bottom: 10px;
}
.filter-btn {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    color: var(--text-muted);
    padding: 8px 20px;
    border-radius: 99px;
    white-space: nowrap;
    cursor: pointer;
    transition: var(--transition-fast);
}
.filter-btn.active, .filter-btn:hover {
    border-color: var(--text-gold);
    color: var(--text-gold);
    background: rgba(202, 160, 82, 0.1);
}

.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
    content-visibility: auto;
    contain-intrinsic-size: 0 400px;
}

.media-item {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    overflow: hidden;
    transition: var(--transition-base);
    position: relative;
    contain: layout style;
}
.media-item:hover { transform: translateY(-5px); border-color: var(--text-gold); }
.media-thumb-container {
    width: 100%;
    aspect-ratio: 16 / 9;
    overflow: hidden;
    background: linear-gradient(90deg, rgba(202,160,82,0.05) 25%, rgba(202,160,82,0.1) 50%, rgba(202,160,82,0.05) 75%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite linear;
    display: flex;
    align-items: center;
    justify-content: center;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.media-thumb {
    width: 100%;
    height: 100%;
    object-fit: cover;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.media-thumb.loaded {
    opacity: 1;
}

.media-item.article-type .media-thumb-container {
    background: var(--bg-deep);
}
.media-info { padding: 15px; }
.media-info h4 { font-size: 1rem; color: var(--text-main); margin-bottom: 8px; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.media-meta { font-size: 0.8rem; color: var(--text-muted); display: flex; align-items: center; justify-content: space-between; }

.media-type-badge {
    position: absolute;
    top: 10px;
    left: 10px;
    background: rgba(0,0,0,0.6);
    backdrop-filter: blur(5px);
    padding: 4px 10px;
    border-radius: 8px;
    font-size: 12px;
    color: #fff;
    display: flex;
    align-items: center;
    gap: 5px;
    z-index: 2;
}

.admin-actions {
    position: absolute;
    top: 10px;
    right: 10px;
    display: flex;
    gap: 5px;
    opacity: 0;
    transition: 0.3s;
    z-index: 2;
}
.media-item:hover .admin-actions { opacity: 1; }
.media-item .action-btn {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    border: none;
    background: rgba(0,0,0,0.6);
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}
.media-item .action-btn:hover { background: var(--text-gold); }
.media-item .action-btn.delete:hover { background: #ff4757; }

.btn-add-doc {
    background: var(--text-gold);
    color: #000;
    border: none;
    padding: 10px 20px;
    border-radius: 12px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    transition: 0.3s;
}
.btn-add-doc:hover { transform: scale(1.05); filter: brightness(1.1); }

/* Form Elements */
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 500; color: var(--text-muted); }
.form-control {
    width: 100%;
    padding: 12px;
    border-radius: 10px;
    background: var(--bg-dark);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    outline: none;
}
.form-control:focus { border-color: var(--text-gold); }

/* Quill Editor Overrides */
#editor-container {
    height: 300px;
    background: var(--bg-dark);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    border-radius: 0 0 10px 10px;
}
.ql-toolbar.ql-snow { border-color: var(--border-color); border-radius: 10px 10px 0 0; background: var(--bg-deep); }
.ql-container.ql-snow { border-color: var(--border-color); border-radius: 0 0 10px 10px; }
.ql-snow .ql-stroke { stroke: var(--text-main) !important; }
.ql-snow .ql-fill { fill: var(--text-main) !important; }
.ql-snow .ql-picker { color: var(--text-main) !important; }
.ql-snow .ql-stroke:hover, .ql-snow .ql-fill:hover { stroke: var(--text-gold) !important; fill: var(--text-gold) !important; }

/* File Upload */
.upload-zone {
    border: 2px dashed var(--border-color);
    padding: 30px;
    border-radius: 15px;
    text-align: center;
    cursor: pointer;
    transition: 0.3s;
}
.upload-zone:hover { border-color: var(--text-gold); background: rgba(202, 160, 82, 0.05); }
.upload-preview { margin-top: 15px; max-height: 150px; border-radius: 10px; display: none; }

.video-toggle {
    display: flex;
    background: var(--bg-dark);
    border-radius: 10px;
    padding: 4px;
    margin-bottom: 15px;
}
.toggle-btn {
    flex: 1;
    padding: 8px;
    border: none;
    background: transparent;
    color: var(--text-muted);
    border-radius: 7px;
    cursor: pointer;
}
.toggle-btn.active { background: var(--text-gold); color: #000; }

/* Article Reader Modal */
#article-reader-modal .modal-content { 
    max-width: 900px; 
    width: 95%;
    max-height: 92vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}
#article-reader-modal .modal-body {
    flex: 1;
    overflow-y: auto;
    padding: 30px;
    scrollbar-width: thin;
    scrollbar-color: var(--text-gold) transparent;
}
.article-body { line-height: 1.8; color: var(--text-main); font-size: 1.1rem; }
.article-body img { max-width: 100%; border-radius: 15px; margin: 20px 0; display: block; margin-left: auto; margin-right: auto; }

/* Album Stack Effect */
.album-stack { position: relative; width: 100%; height: 100%; }
.stack-layer {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    transition: 0.3s;
}
.layer-2 { transform: translate(5px, -5px); z-index: -1; opacity: 0.7; }
.layer-3 { transform: translate(10px, -10px); z-index: -2; opacity: 0.4; }
.media-item:hover .layer-2 { transform: translate(8px, -8px); }
.media-item:hover .layer-3 { transform: translate(15px, -15px); }

.album-count {
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0,0,0,0.7);
    color: white;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.75rem;
    z-index: 2;
    backdrop-filter: blur(5px);
}

/* Lightbox Navigation */
.nav-btn:hover { background: rgba(255,255,255,0.2) !important; color: var(--text-gold) !important; }

/* Floating Action Button for Mobile */
.fab-add-doc {
    position: fixed;
    bottom: calc(var(--mobile-nav-height) + 20px);
    right: 20px;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--text-gold), var(--primary-dark));
    color: #000;
    border: none;
    border-radius: 50%;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    z-index: 1200;
    cursor: pointer;
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.fab-add-doc:hover { transform: scale(1.1); }
.fab-add-doc:active { transform: scale(0.9); }

@media (max-width: 1024px) {
    .fab-add-doc { display: flex; }
    .header-profile .btn-add-doc { display: none !important; }
}