* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4CAF50;
    --primary-hover: #3e8e41;
    --bg-color: #f0f0f0;
    --text-color: #333;
    --card-bg: white;
    --header-bg: white;
    --border-color: #ddd;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #f0f0f0;
    --card-bg: #2d2d2d;
    --header-bg: #2d2d2d;
    --border-color: #444;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    background-color: var(--header-bg);
    padding: 20px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    margin-bottom: 25px;
    text-align: center;
}

h1 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 2.2rem;
}

.header-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.search-container {
    position: relative;
    display: flex;
    align-items: center;
    max-width: 400px;
    width: 100%;
}

#search-input {
    padding: 12px 40px 12px 15px;
    width: 100%;
    border: 1px solid var(--border-color);
    border-radius: 25px;
    font-size: 16px;
    background-color: var(--card-bg);
    color: var(--text-color);
}

#clear-search {
    position: absolute;
    right: 10px;
    background: none;
    border: none;
    font-size: 20px;
    cursor: pointer;
    color: #999;
    padding: 0;
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

#clear-search:hover {
    color: var(--primary-color);
}

#toggle-dark-mode, #refresh-btn {
    padding: 10px 15px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 25px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

#toggle-dark-mode:hover, #refresh-btn:hover {
    background-color: var(--primary-hover);
}

.stats-bar {
    background-color: var(--card-bg);
    padding: 10px 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.categories {
    max-width: 1400px;
    margin: 0 auto;
    flex-grow: 1;
}

.category {
    margin-bottom: 25px;
    background-color: var(--card-bg);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.category-header {
    background-color: var(--primary-color);
    color: white;
    padding: 15px 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
    transition: background-color 0.3s;
}

.category-header:hover {
    background-color: var(--primary-hover);
}

.category-title {
    font-weight: bold;
}

.toggle-icon {
    font-size: 12px;
    transition: transform 0.3s;
}

.category-content {
    padding: 20px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
}

.media-item {
    cursor: pointer;
    border-radius: 8px;
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
    position: relative;
    background-color: var(--card-bg);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.media-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.media-item img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    display: block;
}

.media-item .filename {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.7));
    color: white;
    padding: 8px;
    font-size: 12px;
    opacity: 0;
    transition: opacity 0.3s;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.media-item:hover .filename {
    opacity: 1;
}

.video-thumbnail {
    position: relative;
    width: 100%;
    height: 180px;
    background-color: #000;
    display: flex;
    justify-content: center;
    align-items: center;
}

.video-thumbnail::after {
    content: '▶';
    position: absolute;
    color: white;
    font-size: 30px;
    opacity: 0.8;
}

.video-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.7;
}

.video-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 30px;
    opacity: 0.8;
}

/* Modal styles */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.9);
    backdrop-filter: blur(5px);
}

.modal-content {
    position: relative;
    background-color: var(--card-bg);
    margin: 2% auto;
    padding: 25px;
    width: 90%;
    max-width: 900px;
    border-radius: 12px;
    text-align: center;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 5px 25px rgba(0, 0, 0, 0.2);
}

.close {
    position: absolute;
    top: 15px;
    right: 20px;
    color: #aaa;
    font-size: 32px;
    font-weight: bold;
    cursor: pointer;
    z-index: 10;
}

.close:hover {
    color: var(--text-color);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

#preview-filename {
    margin: 0;
    font-size: 18px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    max-width: 70%;
}

.file-type-badge {
    background-color: var(--primary-color);
    color: white;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: bold;
}

#preview-container {
    margin: 20px 0;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
}

#preview-container img, 
#preview-container video {
    max-width: 100%;
    max-height: 60vh;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.video-container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

.video-container video {
    width: 100%;
    height: auto;
    max-height: 70vh;
}

.action-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-top: 25px;
    flex-wrap: wrap;
}

.action-buttons button {
    padding: 12px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 16px;
    font-weight: bold;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 8px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: white;
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
}

.btn-secondary {
    background-color: #6c757d;
    color: white;
}

.btn-secondary:hover {
    background-color: #5a6268;
    transform: translateY(-2px);
}

.btn-nav {
    background-color: var(--card-bg);
    color: var(--text-color);
    border: 1px solid var(--border-color) !important;
    padding: 10px 15px;
}

.btn-nav:hover {
    background-color: var(--primary-color);
    color: white;
    border-color: var(--primary-color) !important;
}

.btn-nav:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-nav:disabled:hover {
    background-color: var(--card-bg);
    color: var(--text-color);
    border-color: var(--border-color) !important;
    transform: none;
}

footer {
    margin-top: 40px;
    text-align: center;
    padding: 20px;
    color: #666;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

/* Loading states */
#loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    color: white;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 20px;
}

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

.loading {
    text-align: center;
    padding: 30px;
    color: #666;
    font-style: italic;
}

.error {
    text-align: center;
    padding: 30px;
    color: #dc3545;
    font-weight: bold;
}

.no-items {
    text-align: center;
    padding: 30px;
    color: #666;
    font-style: italic;
}

/* Animation for items */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.media-item {
    animation: fadeIn 0.5s ease-out;
}

/* Toast notification */
.toast {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background-color: #333;
    color: white;
    padding: 15px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    z-index: 1000;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.3s, transform 0.3s;
}

.toast.show {
    opacity: 1;
    transform: translateY(0);
}

.toast.success {
    background-color: var(--primary-color);
}

.toast.error {
    background-color: #dc3545;
}

/* Responsive design */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }
    
    header {
        padding: 15px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    .header-controls {
        flex-direction: column;
        gap: 10px;
    }
    
    .search-container {
        max-width: 100%;
    }
    
    .category-content {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 15px;
        padding: 15px;
    }
    
    .media-item img,
    .video-thumbnail {
        height: 150px;
    }
    
    .modal-content {
        width: 95%;
        margin: 5% auto;
        padding: 20px;
    }
    
    .action-buttons {
        flex-direction: column;
        gap: 10px;
    }
    
    .action-buttons button {
        width: 100%;
    }
    
    .preview-header {
        flex-direction: column;
        gap: 10px;
        text-align: center;
    }
    
    #preview-filename {
        max-width: 100%;
    }
}

@media (max-width: 480px) {
    .category-content {
        grid-template-columns: repeat(auto-fill, minmax(130px, 1fr));
        gap: 10px;
        padding: 10px;
    }
    
    .media-item img,
    .video-thumbnail {
        height: 120px;
    }
    
    .stats-bar {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
}