body {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    background-image: url(./image/bg1.jpg);
    background-size: cover;
    overflow: hidden;
}
canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    display: block;
}

/* 弹窗遮罩 */
.modalOverlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 9999;
}

/* 弹窗内容 */
.modal-content {
    background-color: white;
    border-radius: 10px;
    padding: 50px 80px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.3);
    z-index: 10000;
    min-width: 400px;
}

/* 弹窗文字 */
.modal-text {
    font-size: 26px;
    color: #333;
    margin: 0 0 35px 0;
    font-weight: bold;
}

/* 弹窗按钮 */
.modal-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    padding: 12px 50px;
    font-size: 16px;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.modal-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
}

.modal-btn:active {
    transform: scale(0.98);
}