:root {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.7);
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --border-color: #e2e8f0;
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
    --hover-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --overlay-bg: rgba(0,0,0,0.85);

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font-heading: 'Inter', sans-serif;
    --font-body: 'Mukta Malar', 'Inter', sans-serif;
}

[data-theme="dark"] {
    --bg-primary: #0b0f19;
    --bg-secondary: #111827;
    --bg-glass: rgba(17, 24, 39, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #60a5fa;
    --border-color: #1e293b;
    --card-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    --hover-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.7);
}

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: var(--transition);
    overflow-x: hidden;
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}
::-webkit-scrollbar-track {
    background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* App Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 5%;
    background: var(--bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo i {
    font-size: 1.75rem;
    color: var(--accent);
    background: linear-gradient(135deg, var(--accent), #8b5cf6);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo h1 {
    font-size: 1.25rem;
    font-family: var(--font-heading);
    font-weight: 700;
    letter-spacing: -0.025em;
}

.header-actions button {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
}

.header-actions button:hover {
    background-color: var(--border-color);
    transform: rotate(15deg);
}

/* Main Content */
.main-content {
    padding: 2rem 5%;
    max-width: 1400px;
    margin: 0 auto;
    min-height: calc(100vh - 70px);
}

.section-title {
    font-size: 1.5rem;
    font-family: var(--font-heading);
    margin-bottom: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Views */
.view {
    display: none;
    animation: fadeIn 0.4s ease-out;
}
.view.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

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

.folder-card {
    background: var(--bg-secondary);
    border-radius: 16px;
    padding: 1.5rem;
    box-shadow: var(--card-shadow);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 1.25rem;
    position: relative;
    overflow: hidden;
}

.folder-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 4px; height: 100%;
    background: linear-gradient(to bottom, var(--accent), #8b5cf6);
    opacity: 0;
    transition: var(--transition);
}

.folder-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--hover-shadow);
    border-color: var(--accent);
}

.folder-card:hover::before {
    opacity: 1;
}

.folder-icon {
    width: 60px;
    height: 60px;
    border-radius: 12px;
    background-color: transparent;
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    transition: var(--transition);
    overflow: hidden;
    position: relative;
}

.folder-card:hover .folder-icon {
    background: var(--accent);
    color: white;
    transform: scale(1.05);
}

.folder-info {
    flex: 1;
}

.folder-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.folder-count {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

/* Videos List */
.view-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.back-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    transition: var(--transition);
}

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

.videos-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.video-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    display: flex;
    align-items: center;
    gap: 1.25rem;
    transition: var(--transition);
    cursor: pointer;
    box-shadow: 0 2px 4px rgba(0,0,0,0.02);
}

.video-item:hover {
    background: var(--border-color);
    transform: translateX(5px);
}

.video-thumb {
    width: 120px;
    height: 68px;
    border-radius: 8px;
    background: #000;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.7;
    transition: var(--transition);
}

.video-item:hover .video-thumb img {
    opacity: 1;
    transform: scale(1.05);
}

.play-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 1.5rem;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.video-details {
    flex: 1;
}

.video-title {
    font-weight: 600;
    margin-bottom: 0.35rem;
    font-size: 1.05rem;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    gap: 1rem;
}

.video-actions {
    display: flex;
    gap: 0.5rem;
}

.action-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.2rem;
}

.action-btn:hover {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

/* Spinner */
.loading-state {
    grid-column: 1 / -1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 0;
    color: var(--text-secondary);
}
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1rem;
}
@keyframes spin { 100% { transform: rotate(360deg); } }

/* Video Player Modal - MX Player Style */
.player-modal {
    position: fixed;
    top: 0; left: 0; width: 100vw; height: 100vh;
    background: #000;
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.player-modal.active {
    opacity: 1;
    pointer-events: all;
}

.player-container {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    background: #000;
    overflow: hidden;
}

#main-video {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: #000;
}

/* Player Overlays */
.player-top-bar {
    position: absolute;
    top: 0; left: 0; right: 0;
    padding: 1.5rem;
    background: linear-gradient(to bottom, rgba(0,0,0,0.8), transparent);
    display: flex;
    align-items: center;
    gap: 1rem;
    z-index: 10;
    opacity: 1;
    transition: opacity 0.3s;
}

.close-player-btn {
    background: none; border: none;
    color: white; font-size: 1.8rem;
    cursor: pointer;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.player-title {
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    text-shadow: 0 2px 4px rgba(0,0,0,0.5);
}

.center-play-pause {
    position: absolute;
    top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    width: 80px; height: 80px;
    background: rgba(0,0,0,0.6);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 3rem;
    pointer-events: none;
    z-index: 10;
    opacity: 1;
    transition: opacity 0.3s ease, transform 0.2s ease;
}

.center-play-pause.animating {
    transform: translate(-50%, -50%) scale(1.2);
    opacity: 0;
}

.center-play-pause.hidden {
    opacity: 0;
}

.double-tap-indicator {
    position: absolute;
    top: 50%; transform: translateY(-50%);
    background: rgba(255,255,255,0.1);
    color: white;
    padding: 2rem 1rem;
    border-radius: 50%;
    display: flex; flex-direction: column; align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
    z-index: 10;
}
.double-tap-indicator i { font-size: 2rem; margin-bottom: 0.5rem; }
.double-tap-indicator.left { left: 10%; border-radius: 0 50% 50% 0; }
.double-tap-indicator.right { right: 10%; border-radius: 50% 0 0 50%; }
.double-tap-indicator.active {
    opacity: 1;
    animation: ripple 0.5s ease-out;
}
@keyframes ripple {
    0% { transform: translateY(-50%) scale(0.8); background: rgba(255,255,255,0.2); }
    100% { transform: translateY(-50%) scale(1); background: rgba(255,255,255,0); }
}

/* Bottom Controls */
.player-controls {
    position: absolute;
    bottom: 0; left: 0; right: 0;
    padding: 1.5rem;
    background: linear-gradient(to top, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0) 100%);
    z-index: 10;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    opacity: 1;
    transition: opacity 0.3s, transform 0.3s;
}

/* Hide controls when inactive */
.player-container.inactive .player-controls {
    opacity: 0;
    transform: translateY(20px);
    pointer-events: none;
}
.player-container.inactive .player-top-bar {
    opacity: 0;
    pointer-events: none;
}

.progress-area {
    width: 100%;
    height: 8px;
    background: rgba(255,255,255,0.2);
    border-radius: 4px;
    cursor: pointer;
    position: relative;
    transition: height 0.2s;
}
.progress-area:hover { height: 10px; }

.progress-bar {
    height: 100%;
    background: var(--accent);
    width: 0%;
    border-radius: 4px;
    position: relative;
    pointer-events: none;
}

.progress-handle {
    position: absolute;
    right: -8px; top: 50%;
    transform: translateY(-50%) scale(0);
    width: 16px; height: 16px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 0 5px rgba(0,0,0,0.5);
    transition: transform 0.2s;
}
.progress-area:hover .progress-handle { transform: translateY(-50%) scale(1); }

.controls-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.controls-left, .controls-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.control-btn {
    background: none; border: none;
    color: white; font-size: 1.5rem;
    cursor: pointer;
    transition: color 0.2s;
}
.control-btn:hover { color: var(--accent); }

.time-display {
    color: white; font-size: 0.9rem;
    font-family: monospace;
    user-select: none;
}

.volume-slider {
    width: 80px;
    accent-color: var(--accent);
    cursor: pointer;
}

.video-loader {
    position: absolute; top: 50%; left: 50%;
    transform: translate(-50%, -50%);
    z-index: 5;
}
.video-loader .spinner { border-color: rgba(255,255,255,0.2); border-top-color: white; }

/* Speed Menu */
.speed-menu {
    position: absolute;
    bottom: 80px;
    left: 60px;
    background: rgba(17, 24, 39, 0.95);
    border-radius: 8px;
    padding: 0.5rem 0;
    min-width: 120px;
    border: 1px solid rgba(255,255,255,0.1);
}
.speed-menu.hidden { display: none; }
.speed-menu ul { list-style: none; }
.speed-menu li {
    padding: 0.5rem 1rem;
    color: white;
    cursor: pointer;
    font-size: 0.9rem;
    text-align: center;
}
.speed-menu li:hover { background: rgba(255,255,255,0.1); }
.speed-menu li.active { color: var(--accent); font-weight: bold; }

/* Responsive */
@media (max-width: 768px) {
    .video-item { flex-direction: column; align-items: stretch; text-align: left; }
    .video-thumb { width: 100%; height: 180px; }
    .video-actions { align-self: flex-end; }
    .volume-slider { display: none; } /* Hide volume slider on mobile */
    .controls-left, .controls-right { gap: 0.5rem; }
    .time-display { font-size: 0.8rem; }
}