/* CSS Variables */
:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-tertiary: #f3f4f6;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-tertiary: #9ca3af;
    --border-color: #e5e7eb;
    --accent-primary: #E6007A;
    --accent-hover: #C5006A;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

body.dark-mode {
    --bg-primary: #0f0f0f;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #242424;
    --text-primary: #f1f3f5;
    --text-secondary: #adb5bd;
    --text-tertiary: #868e96;
    --border-color: #2d2d2d;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: 0 16px;
    transition: background-color 0.3s ease;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    height: 56px;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 24px;
}

.menu-btn {
    display: flex;
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    color: var(--text-primary);
    border-radius: 50%;
    transition: background-color 0.2s;
    align-items: center;
    justify-content: center;
}

.menu-btn:hover {
    background-color: var(--bg-tertiary);
}

.menu-btn svg {
    width: 24px;
    height: 24px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-img {
    width: 28px;
    height: 28px;
}

.logo h1 {
    font-size: 20px;
    font-weight: 600;
    white-space: nowrap;
    letter-spacing: -0.5px;
}

.search-container {
    flex: 1;
    max-width: 600px;
    position: relative;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    width: 20px;
    height: 20px;
    color: var(--text-tertiary);
}

.search-input {
    width: 100%;
    padding: 10px 16px 10px 40px;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 14px;
    transition: all 0.2s;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    background-color: var(--bg-primary);
}

.theme-btn {
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    color: var(--text-primary);
    border-radius: 8px;
    transition: background-color 0.2s;
    position: relative;
}

.theme-btn:hover {
    background-color: var(--bg-tertiary);
}

.theme-btn svg {
    width: 24px;
    height: 24px;
}

.sun-icon {
    display: none;
}

body.dark-mode .sun-icon {
    display: block;
}

body.dark-mode .moon-icon {
    display: none;
}

/* Main Layout */
.main-layout {
    display: flex;
    min-height: calc(100vh - 61px);
}

/* Sidebar */
.sidebar {
    width: 240px;
    background-color: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    padding: 12px;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 56px;
    height: calc(100vh - 56px);
    overflow-y: auto;
    overflow-x: hidden;
    transition: width 0.3s ease, transform 0.3s ease;
}

.sidebar.collapsed {
    width: 72px;
}

.sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 10px 12px;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s;
    font-size: 14px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
}

.nav-link svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
}

.nav-link span {
    transition: opacity 0.3s ease;
}

.sidebar.collapsed .nav-link {
    justify-content: center;
    padding: 10px;
}

.sidebar.collapsed .nav-link span {
    opacity: 0;
    width: 0;
    overflow: hidden;
}

.nav-link:hover {
    background-color: var(--bg-tertiary);
}

.nav-link.active {
    background-color: var(--bg-tertiary);
    color: var(--accent-primary);
}

.sidebar-footer {
    margin-top: auto;
    padding-top: 24px;
    transition: opacity 0.3s ease;
}

.sidebar.collapsed .sidebar-footer {
    opacity: 0;
    height: 0;
    overflow: hidden;
}

.sidebar-info {
    font-size: 12px;
    color: var(--text-tertiary);
    line-height: 1.5;
}

/* Content */
.content {
    flex: 1;
    padding: 32px 0;
}

.content-header {
    margin-bottom: 32px;
}

.content-header-top {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 20px;
}

.content-header-left {
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}

.content-header h2 {
    font-size: 28px;
    font-weight: 700;
    margin: 0;
}

.content-header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.filter-sort-controls {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.filter-select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
}

.filter-select:hover {
    background-color: var(--bg-tertiary);
}

.filter-select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

.resource-counts {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.resource-count-card {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 14px;
    transition: all 0.2s;
}

.resource-count-card:hover {
    background-color: var(--bg-tertiary);
    transform: translateY(-1px);
}

.resource-count-icon {
    width: 18px;
    height: 18px;
    color: var(--accent-primary);
}

.resource-count-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.resource-count-number {
    color: var(--text-primary);
    font-weight: 700;
}

.selection-toolbar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    background-color: var(--accent-primary);
    border-radius: 8px;
    color: white;
    font-weight: 500;
}

.selection-toolbar .btn {
    background-color: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.selection-toolbar .btn:hover {
    background-color: rgba(255, 255, 255, 0.3);
}

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

.selection-toolbar .btn-primary:hover {
    background-color: #f0f0f0;
}

/* Media Grid */
.media-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.media-card {
    background-color: var(--bg-secondary);
    border-radius: 12px;
    overflow: hidden;
    transition: transform 0.2s, box-shadow 0.2s;
    cursor: pointer;
    position: relative;
}

.media-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.media-card.select-mode {
    cursor: default;
}

.media-card.selected {
    outline: 3px solid var(--accent-primary);
    outline-offset: -3px;
}

.select-checkbox {
    position: absolute;
    top: 12px;
    right: 12px;
    z-index: 10;
    width: 28px;
    height: 28px;
    background-color: rgba(0, 0, 0, 0.6);
    border: 2px solid white;
    border-radius: 6px;
    display: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s;
}

.select-mode .select-checkbox {
    display: flex;
}

.select-checkbox.checked {
    background-color: var(--accent-primary);
    border-color: var(--accent-primary);
}

.select-checkbox svg {
    width: 18px;
    height: 18px;
    stroke: white;
    stroke-width: 3;
    display: none;
}

.select-checkbox.checked svg {
    display: block;
}

.media-thumbnail {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: var(--bg-tertiary);
    overflow: hidden;
}

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

.media-card.image-card .media-thumbnail img {
    object-fit: contain;
    background-color: #000;
}

.media-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 50%);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.2s;
}

.media-card:hover .media-overlay {
    opacity: 1;
}

.play-icon {
    width: 64px;
    height: 64px;
    background-color: var(--accent-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.play-icon svg {
    width: 32px;
    height: 32px;
    fill: currentColor;
    margin-left: 4px;
}

.media-info {
    padding: 16px;
}

.media-title {
    font-size: 15px;
    font-weight: 600;
    margin-bottom: 8px;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.media-meta {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 13px;
}

.media-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 4px 8px;
    background-color: var(--bg-tertiary);
    border-radius: 4px;
    font-size: 12px;
    font-weight: 500;
}

.media-badge svg {
    width: 14px;
    height: 14px;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}

.empty-state svg {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 20px;
    margin-bottom: 8px;
    color: var(--text-primary);
}

/* Video Modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal.active {
    display: flex;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.9);
}

.modal-content {
    position: relative;
    background-color: var(--bg-secondary);
    border-radius: 16px;
    max-width: 1200px;
    width: 100%;
    max-height: 90vh;
    overflow: auto;
    box-shadow: var(--shadow-xl);
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background-color: rgba(0, 0, 0, 0.5);
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: background-color 0.2s;
}

.modal-close:hover {
    background-color: rgba(0, 0, 0, 0.7);
}

.modal-close svg {
    width: 24px;
    height: 24px;
}

.modal-body {
    padding: 20px;
}

.video-container {
    position: relative;
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: #000;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 20px;
}

.video-container video,
.video-container iframe {
    width: 100%;
    height: 100%;
}

.modal-info h3 {
    font-size: 24px;
    margin-bottom: 12px;
}

.modal-info p {
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.6;
}

.modal-metadata {
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 20px;
}

.metadata-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 12px;
    margin-bottom: 12px;
}

.metadata-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.metadata-label {
    font-size: 12px;
    color: var(--text-tertiary);
    font-weight: 500;
    text-transform: uppercase;
}

.metadata-value {
    font-size: 14px;
    color: var(--text-primary);
    font-weight: 500;
}

.metadata-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.metadata-tag {
    display: inline-block;
    padding: 4px 12px;
    background-color: var(--accent-primary);
    color: white;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 500;
}

.modal-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

/* Lightbox */
.lightbox {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.lightbox.active {
    display: flex;
}

.lightbox-backdrop {
    position: absolute;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.95);
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.lightbox-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background-color: rgba(0, 0, 0, 0.5);
    border: none;
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    transition: background-color 0.2s;
}

.lightbox-close:hover {
    background-color: rgba(0, 0, 0, 0.7);
}

.lightbox-close svg {
    width: 24px;
    height: 24px;
}

#lightboxImg {
    max-width: 100%;
    max-height: calc(90vh - 100px);
    border-radius: 8px;
    object-fit: contain;
}

.lightbox-info {
    background-color: var(--bg-secondary);
    padding: 16px 24px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 20px;
}

.lightbox-info h3 {
    font-size: 18px;
    flex: 1;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 500;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
}

.btn svg {
    width: 18px;
    height: 18px;
}

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

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

.btn-secondary {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--border-color);
}

/* Contribute Form */
.contribute-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.form-group label {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    font-size: 14px;
    font-family: inherit;
    transition: all 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    background-color: var(--bg-primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* Responsive */
@media (max-width: 1024px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 56px;
        z-index: 90;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
        width: 240px !important;
        box-shadow: var(--shadow-lg);
    }

    .sidebar.collapsed {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-layout {
        margin-left: 0;
    }

    .content-header-top {
        flex-direction: column;
        align-items: flex-start;
    }

    .content-header-left {
        width: 100%;
        flex-direction: column;
        align-items: flex-start;
    }

    .content-header-actions {
        width: 100%;
    }
}

@media (max-width: 768px) {
    .logo h1 {
        display: none;
    }

    .search-container {
        max-width: 100%;
    }

    .media-grid {
        grid-template-columns: 1fr;
    }

    .modal-content {
        max-height: 100vh;
        border-radius: 0;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .content {
        padding: 20px 0;
    }

    .content-header h2 {
        font-size: 24px;
    }

    .resource-counts {
        width: 100%;
    }

    .resource-count-card {
        flex: 1;
        justify-content: center;
    }

    .modal-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        justify-content: center;
    }

    .selection-toolbar {
        width: 100%;
        flex-direction: column;
        align-items: stretch;
    }

    .selection-toolbar .btn {
        width: 100%;
    }
}