body {
    margin: 0;
    padding: 0;
    overflow: hidden;
    font-family: Arial, sans-serif;
    background: #111;
}
#glCanvas {
    display: block;
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
    border-bottom-left-radius: 0px;
    border-bottom-right-radius: 0px;
}
#ui {
    /* position: absolute; */
    top: 20px;
    left: 20px;
    z-index: 10;
    background: rgba(0,0,0,0.8);
    padding: 20px;
    border-bottom-left-radius: 10px;
    border-bottom-right-radius: 10px;
    color: white;
    min-width: 280px;
}
button {
    background: #4CAF50;
    color: white;
    border: none;
    padding: 12px 24px;
    font-size: 14px;
    cursor: pointer;
    border-radius: 5px;
    width: 100%;
    margin-bottom: 15px;
    transition: background 0.3s;
}
button:hover {
    background: #45a049;
}
.control-group {
    margin-bottom: 15px;
}
label {
    display: block;
    margin-bottom: 5px;
    font-size: 13px;
    color: #aaa;
}
input[type="range"] {
    width: 100%;
    margin-bottom: 5px;
}
input[type="text"] {
    width: 100%;
    padding: 8px;
    border: 1px solid #555;
    background: #222;
    color: white;
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 13px;
}
.value-display {
    font-size: 12px;
    color: #4CAF50;
    text-align: right;
}
#info {
    margin-top: 10px;
    padding-top: 10px;
    border-top: 1px solid #333;
    font-size: 12px;
    color: #888;
}