body { font-family: 'Segoe UI', sans-serif; background: #f5f7fa; margin: 0; padding: 0; color: #333; text-align: center; }
    header { background: #3498db; color: white; padding: 1em; text-align: center; }
    .header-row { display: flex; align-items: center; justify-content: center; gap: 10px; }
    .header-row img { height: 60px; }
    .header-row h1 { margin: 0; font-size: 1.8em; }
    h1, h2 { margin: 20px 0; }
    .container { padding: 20px; max-width: 800px; margin: auto; }
    .button-grid { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; }
    button { background: #3498db; color: white; border: none; padding: 10px 20px; border-radius: 5px; cursor: pointer; font-size: 1rem; transition: background 0.3s; }
    button:hover { background: #2980b9; }
    img { max-width: 90%; border-radius: 8px; box-shadow: 0 2px 8px rgba(0,0,0,0.1); cursor: pointer; transition: transform 0.2s; }
    img:hover { transform: scale(1.02); }
    audio { width: 90%; margin: 15px auto; }
    footer { margin: 30px 0; color: #888; font-size: 0.9em; }