* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    height: 100vh;
    background: #0a0e17;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
    color: white;
    font-family: 'Arial', sans-serif;
    position: relative;
}

/* 动态背景层 */
.background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 20% 30%, rgba(30 18 183 / 60%) 0%, transparent 40%), radial-gradient(circle at 80% 70%, rgba(25 112 203 / 60%) 0%, transparent 40%);
    z-index: 1;
}