:root {
    /* Color Palette */
    --bg-base: #0f172a;
    --bg-surface: rgba(30, 41, 59, 0.7);
    --bg-surface-hover: rgba(51, 65, 85, 0.9);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #3b82f6;
    --accent-hover: #2563eb;
    --danger: #ef4444;
    
    /* Glassmorphism */
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
    /* subtle background mesh/gradient */
    background-image: radial-gradient(at 0% 0%, rgba(59, 130, 246, 0.15) 0px, transparent 50%),
                      radial-gradient(at 100% 100%, rgba(139, 92, 246, 0.15) 0px, transparent 50%);
    background-attachment: fixed;
}

/* Typography Utilities */
.truncate {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

/* Layout */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

main {
    flex: 1;
    padding: 6rem 2rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* Header & Glassmorphism */
.glass-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--accent-color);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--text-primary);
}

/* Breadcrumbs */
.breadcrumbs {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    overflow-x: auto;
    white-space: nowrap;
    scrollbar-width: none; /* Firefox */
}
.breadcrumbs::-webkit-scrollbar {
    display: none; /* Safari and Chrome */
}

.breadcrumb-item {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.breadcrumb-item:hover {
    color: var(--text-primary);
}

.breadcrumb-item.active {
    color: var(--text-primary);
    font-weight: 500;
    pointer-events: none;
}

.breadcrumb-separator {
    color: var(--text-secondary);
    opacity: 0.5;
}

/* Grid Layout */
.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

/* Item Cards */
.item-card {
    background: var(--bg-surface);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    overflow: hidden;
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    position: relative;
    backdrop-filter: blur(8px);
}

.item-card:hover {
    transform: translateY(-4px);
    background: var(--bg-surface-hover);
    border-color: rgba(255, 255, 255, 0.2);
    box-shadow: 0 10px 40px -10px rgba(0,0,0,0.5);
}

.item-card:hover .play-overlay {
    opacity: 1;
}

.card-thumbnail {
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: rgba(0,0,0,0.3);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.item-card:hover .card-thumbnail img {
    transform: scale(1.05);
}

.folder-icon {
    color: var(--accent-color);
    width: 48px;
    height: 48px;
    opacity: 0.8;
}

.play-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.play-button {
    width: 56px;
    height: 56px;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(4px);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    border: 1px solid rgba(255,255,255,0.3);
}

.card-info {
    padding: 1.25rem;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.item-name {
    font-size: 1.05rem;
    font-weight: 500;
    line-height: 1.4;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.item-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: auto;
}

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.modal-backdrop {
    position: absolute;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 1000px;
    background: var(--bg-base);
    border: 1px solid var(--glass-border);
    border-radius: 1rem;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transform: scale(1);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal.hidden .modal-content {
    transform: scale(0.95);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(30, 41, 59, 0.5);
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 500;
    margin-right: 1rem;
}

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.icon-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.video-container {
    width: 100%;
    aspect-ratio: 16 / 9;
    background: #000;
}

iframe {
    width: 100%;
    height: 100%;
    border: none;
    outline: none;
}



/* Utility Classes */
.hidden {
    display: none !important;
}

/* Status Containers */
.loader-container, .error-container, .empty-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 2rem;
    text-align: center;
    gap: 1.5rem;
    color: var(--text-secondary);
    min-height: 400px;
}

.error-container {
    color: var(--danger);
}
.error-container svg {
    color: var(--danger);
}

/* Spinner */
.spinner {
    width: 48px;
    height: 48px;
    border: 3px solid rgba(255,255,255,0.1);
    border-radius: 50%;
    border-top-color: var(--accent-color);
    animation: spin 1s ease-in-out infinite;
}

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

/* Responsive */
@media (max-width: 768px) {
    main {
        padding-top: 5rem;
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .header-content {
        padding: 1rem;
    }

    .modal {
        padding: 0;
    }

    .modal-content {
        border-radius: 0;
        height: 100vh;
        max-width: 100%;
        border: none;
    }

    .video-container {
        flex: 1;
        display: flex;
        align-items: center;
    }
}