/* Base layout */
body {
    margin: 0;
    height: 100vh;
    background: radial-gradient(circle at center, #1a1a1a, #000);
    overflow: hidden;
    font-family: Arial, sans-serif;
}

/* Physics container */
#container {
    position: relative;
    width: 100%;
    height: 100%;
}

/* Boxes (physics objects) */
.box {
    width: 60px;
    height: 60px;
    position: absolute;
    border-radius: 10px;
    box-shadow: 0 0 20px rgba(255,255,255,0.3);
    transition: transform 0.1s;
    will-change: transform;
}

/* Controls UI */
#controls {
    position: fixed;
    top: 10px;
    left: 10px;
    z-index: 1000;
}

/* Buttons */
button {
    padding: 10px 14px;
    margin: 5px;
    border: none;
    background: #222;
    color: white;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s ease;
    font-size: 14px;
}

/* Hover effect */
button:hover {
    background: #444;
    transform: scale(1.05);
}

/* Click effect */
button:active {
    transform: scale(0.95);
}