/* 页面样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background: #000;
    overflow: hidden;
    font-family: Arial, sans-serif;
}

h1 {
    position: absolute;
    top: 20px;
    color: white;
    text-shadow: 0 0 10px rgba(255,255,255,0.8);
    z-index: 10;
}

/* 画布居中 */
canvas {
    display: block;
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border-radius: 10px;
    box-shadow: 0 0 30px rgba(255, 255, 255, 0.3);
}