body {
    font-family: 'Noto Sans SC', sans-serif;
    touch-action: manipulation;
}

.board-bg {
    background-color: #e3b778;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1), 0 6px 6px rgba(0,0,0,0.15);
}

canvas {
    cursor: pointer;
    display: block;
}

.controls-card {
    background-color: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn {
    transition: all 0.2s ease-in-out;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.radio-label input:checked + span .radio-dot {
    transform: scale(1);
    opacity: 1;
}