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

.container {
    position: relative;
    background: rgba(0, 0, 0, 0.2);
    padding: 40px;
    border-radius: 15px;
    text-align: center;
    backdrop-filter: blur(10px);
    max-width: 600px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}

h1 {
    font-size: 2em;
    margin-bottom: 20px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

footer {
    margin-top: 40px;
    font-size: 0.9em;
    opacity: 0.8;
}

.video-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); 
    gap: 20px; margin: 30px 0; 
    text-align: left; 
}

.video-item { 
    background: rgba(255, 255, 255, 0.1); 
    padding: 15px; 
    border-radius: 10px; 
    border: 1px solid rgba(255, 255, 255, 0.2); 
    box-shadow: 0 4px 15px rgba(0,0,0,0.2); 
}

.video-item h3 { 
    font-size: 1rem; 
    margin: 0 0 10px 0; 
    color: #e0e0e0; 
}

video { 
    width: 100%; 
    border-radius: 5px; 
    background: #000; 
}

.external-resources { 
    background: rgba(255, 255, 255, 0.15); 
    padding: 15px; 
    border-radius: 8px; 
    margin-top: 20px; 
    font-size: 0.85em; 
    border-left: 4px solid #ffcc00; 
}

.external-resources a { 
    color: #ffcc00; 
    text-decoration: none; 
    font-weight: bold; 
}

.external-resources a:hover { 
    text-decoration: underline; 
}