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

:root {
    --primary-color: #ff0000;
    --bg-primary: #0f0f0f;
    --bg-secondary: #212121;
    --bg-tertiary: #272727;
    --text-primary: #ffffff;
    --text-secondary: #aaaaaa;
    --border-color: #3f3f3f;
    --hover-bg: #3f3f3f;
    --header-height: 56px;
    --sidebar-width: 240px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 16px;
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
}

.header-left {
    display: flex;
    align-items: center;
    gap: 16px;
    min-width: 169px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 20px;
}

.header-center {
    flex: 1;
    max-width: 640px;
    display: flex;
    align-items: center;
    gap: 8px;
    margin: 0 40px;
}

.search-form {
    flex: 1;
    display: flex;
    align-items: center;
    border: 1px solid var(--border-color);
    border-radius: 40px;
    overflow: hidden;
}

.search-input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 10px 16px;
    color: var(--text-primary);
    font-size: 16px;
    outline: none;
}

.search-input::placeholder {
    color: var(--text-secondary);
}

.search-btn {
    background-color: var(--bg-tertiary);
    border: none;
    border-left: 1px solid var(--border-color);
    padding: 10px 20px;
    cursor: pointer;
    color: var(--text-primary);
    display: flex;
    align-items: center;
}

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

.icon-btn {
    background: transparent;
    border: none;
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
}

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

.voice-search-btn {
    background-color: var(--bg-secondary);
}

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

.anycoder-link {
    color: var(--text-primary);
    text-decoration: none;
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    transition: background-color 0.2s;
}

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

.notification-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 10px;
    font-size: 10px;
    padding: 2px 5px;
    font-weight: 600;
}

.user-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
}

/* Main Container */
.main-container {
    display: flex;
    margin-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: var(--header-height);
    width: var(--sidebar-width);
    height: calc(100vh - var(--header-height));
    background-color: var(--bg-primary);
    overflow-y: auto;
    padding: 12px 0;
    transition: transform 0.3s ease;
}

.sidebar::-webkit-scrollbar {
    width: 8px;
}

.sidebar::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 4px;
}

.sidebar::-webkit-scrollbar-track {
    background-color: transparent;
}

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

.nav-section {
    border-bottom: 1px solid var(--border-color);
    padding: 8px 0;
}

.nav-section-title {
    font-size: 14px;
    font-weight: 500;
    padding: 8px 24px;
    color: var(--text-secondary);
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 10px 24px;
    color: var(--text-primary);
    text-decoration: none;
    cursor: pointer;
    transition: background-color 0.2s;
}

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

.nav-item.active {
    background-color: var(--hover-bg);
    font-weight: 500;
}

.nav-item svg {
    width: 24px;
    height: 24px;
}

.channel-avatar {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
}

/* Content */
.content {
    margin-left: var(--sidebar-width);
    flex: 1;
    padding: 24px;
}

/* Category Pills */
.category-pills {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    margin-bottom: 24px;
    padding-bottom: 8px;
}

.category-pills::-webkit-scrollbar {
    height: 6px;
}

.category-pills::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 3px;
}

.pill {
    padding: 8px 16px;
    background-color: var(--bg-secondary);
    border: none;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    white-space: nowrap;
    transition: background-color 0.2s;
}

.pill:hover {
    background-color: var(--hover-bg);
}

.pill.active {
    background-color: var(--text-primary);
    color: var(--bg-primary);
}

/* Video Grid */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 16px;
}

.video-card {
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.video-thumbnail-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    background-color: var(--bg-secondary);
    border-radius: 12px;
    overflow: hidden;
}

.video-thumbnail {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.video-duration {
    position: absolute;
    bottom: 8px;
    right: 8px;
    background-color: rgba(0, 0, 0, 0.8);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: 600;
}

.video-details {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}

.channel-icon {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--primary-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 14px;
    flex-shrink: 0;
}

.video-info-grid {
    flex: 1;
}

.video-title-grid {
    font-size: 14px;
    font-weight: 500;
    line-height: 1.4;
    margin-bottom: 4px;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.video-metadata {
    font-size: 12px;
    color: var(--text-secondary);
}

.video-metadata span:not(:last-child)::after {
    content: " • ";
    margin: 0 4px;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    }
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

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

    .content {
        margin-left: 0;
    }

    .header-center {
        margin: 0 16px;
    }

    .voice-search-btn {
        display: none;
    }

    .video-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 12px;
    }

    .anycoder-link {
        display: none;
    }
}

@media (max-width: 480px) {
    .header-center {
        display: none;
    }

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

    .content {
        padding: 16px;
    }
}