:root {
    --primary-color: #7c4dff;
    --bg-dark: #0f0a1f;
    --sidebar-bg: #1a1433;
    --text-primary: #ffffff;
    --text-secondary: #b0aec5;
    --active-item: #2d2454;
    --border-color: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

body {
    background-color: var(--bg-dark);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    overflow: hidden;
}

/* Sidebar Styling */
.sidebar {
    width: 300px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    z-index: 10;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h1 {
    font-size: 1.2rem;
    font-weight: 700;
    background: linear-gradient(45deg, #fff, #b0aec5);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.video-list {
    flex: 1;
    overflow-y: auto;
    padding: 12px 0;
}

.video-list::-webkit-scrollbar {
    width: 6px;
}

.video-list::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

.video-item {
    padding: 16px 24px;
    cursor: pointer;
    transition: all 0.2s ease;
    border-left: 4px solid transparent;
    display: flex;
    align-items: center;
    gap: 12px;
}

.video-item:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.video-item.active {
    background-color: var(--active-item);
    border-left-color: var(--primary-color);
}

.video-item .index {
    color: var(--text-secondary);
    font-size: 0.9rem;
    min-width: 20px;
}

.video-item .title {
    font-size: 0.95rem;
    font-weight: 500;
    line-height: 1.4;
}

/* Main Content Styling */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 40px;
    background: radial-gradient(circle at top right, #1e1441, #0f0a1f);
    position: relative;
    overflow-y: auto;
}

.player-container {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    background: #000;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
    border: 1px solid var(--border-color);
    aspect-ratio: 16 / 9;
}

video {
    width: 100%;
    height: 100%;
    display: block;
}

.video-info {
    max-width: 1000px;
    margin: 24px auto 0;
    width: 100%;
}

.video-info h2 {
    font-size: 1.8rem;
    margin-bottom: 8px;
}

.video-info p {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Responsive */
@media (max-width: 768px) {
    body {
        flex-direction: column;
    }

    .sidebar {
        width: 100%;
        height: auto;
        max-height: 30vh;
    }

    .main-content {
        padding: 20px;
    }
}