:root {
    --primary-color: #ff0000;
    --secondary-color: #606060;
    --background-color: #ffffff;
    --text-color: #0f0f0f;
    --hover-color: #f2f2f2;
}

[data-theme="dark"] {
    --background-color: #0f0f0f;
    --text-color: #ffffff;
    --hover-color: #272727;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    transition: background-color 0.3s ease;
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background-color: var(--background-color);
    display: flex;
    align-items: center;
    padding: 0 16px;
    border-bottom: 1px solid #e5e5e5;
    z-index: 1000;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo img {
    height: 20px;
}

.menu-btn, .search-btn, .mic-btn, .theme-toggle, .create-btn, .notifications-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    color: var(--text-color);
}

.menu-btn:hover, .search-btn:hover, .mic-btn:hover, .theme-toggle:hover, .create-btn:hover, .notifications-btn:hover {
    background-color: var(--hover-color);
}

.search-bar {
    display: flex;
    align-items: center;
    max-width: 600px;
    width: 100%;
    margin: 0 auto;
}

.search-input {
    width: 100%;
    padding: 8px 16px;
    border: 1px solid #ccc;
    border-radius: 20px;
    font-size: 1rem;
    background-color: var(--background-color);
    color: var(--text-color);
}

.header-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-profile img {
    width: 32px;
    height: 32px;
    border-radius: 50%;
}

/* Sidebar Styles */
.sidebar {
    position: fixed;
    left: 0;
    top: 56px;
    bottom: 0;
    width: 240px;
    background-color: var(--background-color);
    overflow-y: auto;
    transition: transform 0.3s ease;
}

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

.sidebar-section {
    padding: 12px 0;
    border-bottom: 1px solid #e5e5e5;
}

.sidebar-item {
    display: flex;
    align-items: center;
    padding: 8px 24px;
    cursor: pointer;
    gap: 24px;
}

.sidebar-item:hover {
    background-color: var(--hover-color);
}

.sidebar-item.active {
    background-color: var(--hover-color);
}

.sidebar-item i {
    width: 24px;
    text-align: center;
}

/* Main Content Styles */
.main-content {
    margin-left: 240px;
    margin-top: 56px;
    padding: 24px;
    transition: margin-left 0.3s ease;
}

.main-content.expanded {
    margin-left: 0;
}

/* Categories */
.categories {
    display: flex;
    gap: 12px;
    padding: 12px 0;
    overflow-x: auto;
    scrollbar-width: none;
}

.categories::-webkit-scrollbar {
    display: none;
}

.category-btn {
    padding: 8px 16px;
    border: 1px solid #ccc;
    border-radius: 20px;
    background: none;
    cursor: pointer;
    white-space: nowrap;
    color: var(--text-color);
}

.category-btn.active {
    background-color: var(--text-color);
    color: var(--background-color);
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    padding: 20px 0;
}

/* Video Card */
.video-card {
    cursor: pointer;
    transition: transform 0.2s ease;
}

.video-card:hover {
    transform: scale(1.02);
}

.thumbnail-container {
    position: relative;
    width: 100%;
}

.thumbnail {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    border-radius: 12px;
}

.duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background-color: rgba(0, 0, 0, 0.8);
    color: white;
    padding: 2px 4px;
    border-radius: 4px;
    font-size: 0.8rem;
}

.video-info {
    padding: 12px 0;
}

.channel-info {
    display: flex;
    gap: 12px;
}

.channel-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
}

.video-details {
    flex: 1;
}

.video-title {
    font-size: 1rem;
    font-weight: 500;
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.channel-name, .video-stats {
    font-size: 0.9rem;
    color: var(--secondary-color);
}


@media (max-width: 1200px) {
    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }
    
    .search-bar {
        display: none;
    }
}


@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.fade-in {
    animation: fadeIn 0.3s ease;
}


@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.skeleton {
    background: linear-gradient(to right, #f0f0f0 8%, #e0e0e0 18%, #f0f0f0 33%);
    background-size: 2000px 100%;
    animation: shimmer 2s infinite linear;
}

.skeleton-loader {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    padding: 24px 0;
    max-width: 100%;
}

.skeleton-card {
    width: 100%;
    cursor: default;
}

.skeleton-thumbnail {
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: 12px;
    margin-bottom: 12px;
    min-height: 200px;
}

.skeleton-info {
    display: flex;
    gap: 12px;
    padding: 12px 0;
}

.skeleton-avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    flex-shrink: 0;
}

.skeleton-details {
    flex: 1;
}

.skeleton-text {
    height: 16px;
    margin-bottom: 8px;
    border-radius: 4px;
    width: 100%;
}

.skeleton-text:nth-child(1) {
    width: 90%;
    height: 20px;
}

.skeleton-text:nth-child(2) {
    width: 60%;
    height: 16px;
}

.skeleton-text:nth-child(3) {
    width: 40%;
    height: 14px;
}

@media (max-width: 1200px) {
    .skeleton-loader {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .skeleton-loader {
        grid-template-columns: 1fr;
    }
}