/* ゲームコンテナを中央に配置 */
#game-container {
    width: 100vw;
    height: 100vh;
    display: block;
    position: relative;
    overflow: hidden;
    background-color: var(--theme-uiBg);
    border: var(--theme-uiContainerBorder);
    /* Decoration: Border waves/dots */
    background-image:
        radial-gradient(var(--color-accent-primary) 2px, transparent 2px),
        radial-gradient(var(--color-accent-secondary) 2px, transparent 2px);
    background-size: 20px 20px;
    background-position: 0 0, 10px 10px;
}

canvas {
    width: 100%;
    height: 100%;
    display: block;
    background-color: var(--theme-uiBodyBg);
}

/* Scrollbar Customization for modals/scrollable content */
::-webkit-scrollbar {
    width: 6px;
}
::-webkit-scrollbar-track {
    background: rgba(0,0,0,0.05);
    border-radius: 10px;
}
::-webkit-scrollbar-thumb {
    background: var(--color-accent-primary);
    border-radius: 10px;
}