.game-container {
    aspect-ratio: 16/9;
    max-width: 100%;
    margin: 0 auto;
    position: relative;
}

.game-container.fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 9999;
    background: #000;
}

.fullscreen-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    border: none;
    border-radius: 4px;
    padding: 8px 12px;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 100;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 500;
}

.fullscreen-btn:hover {
    background: rgba(0, 0, 0, 0.9);
    transform: scale(1.05);
}

.fullscreen-btn svg {
    width: 16px;
    height: 16px;
    fill: white;
}