body {
    margin: 0;
    overflow: hidden;
    background-color: #000;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

#canvas-container {
    width: 100vw;
    height: 100vh;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
}

#ui-container {
    position: absolute;
    top: 20px;
    right: 20px;
    z-index: 10;
    pointer-events: none; /* 让鼠标穿透到 canvas，除非点到 UI 元素 */
}

#ui-container > * {
    pointer-events: auto;
}

.control-group {
    margin-bottom: 10px;
    text-align: right;
}

#fullscreen-btn {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.4);
    color: white;
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.3s;
    font-size: 14px;
    backdrop-filter: blur(5px);
}

#fullscreen-btn:hover {
    background: rgba(255, 255, 255, 0.4);
}

#loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: white;
    font-size: 24px;
    z-index: 20;
    pointer-events: none;
    text-shadow: 0 0 10px rgba(0, 255, 255, 0.7);
}

/* 调整 lil-gui 的样式使其更现代 */
.lil-gui {
    --background-color: rgba(20, 20, 30, 0.8);
    --text-color: #eee;
    --title-background-color: #2a2a3a;
    --widget-color: #444;
    --hover-color: #555;
    --focus-color: #666;
    --number-color: #2cc9ff;
    --string-color: #a2ff00;
    backdrop-filter: blur(10px);
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.5);
}

.lil-gui .title {
    border-top-left-radius: 8px;
    border-top-right-radius: 8px;
}