body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.container {
    text-align: center;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    max-width: 800px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

.login-container {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 40px;
    max-width: 400px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

#video-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 30px;
}

.video-item {
    cursor: pointer;
}

#video-player {
    width: 100%;
    margin-top: 20px;
}

.progress-container {
    width: 100%;
    background-color: #ddd;
    border-radius: 5px;
    margin-top: 20px;
}

.progress-bar {
    width: 0%;
    height: 20px;
    background-color: #4CAF50;
    border-radius: 5px;
    text-align: center;
    line-height: 20px;
    color: white;
}