.watermark {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.55; /* 调整透明度为更合适的值 */
    overflow: hidden;

    /* 单层水印效果 */
    background-image:
        url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='150'><text x='50%' y='50%' text-anchor='middle' dominant-baseline='middle' font-size='2em' font-weight='bold' fill='%232c5282' fill-opacity='0.2' transform='rotate(-45 100 75)'>河南铭书教育</text></svg>");

    /* 设置水印大小 */
    background-size: 200px 150px;

    /* 水印位置 */
    background-position: 0 0;

    background-repeat: repeat;
}

/* 鼠标悬停时水印稍微明显一些 */
.watermark:hover {
    opacity: 0.55;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .watermark {
        background-size: 150px 100px;
        opacity: 0.55;
    }
}

/* 打印样式 */
@media print {
    .watermark {
        opacity: 0.55;
        background-image:
            url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='200' height='150'><text x='50%' y='50%' text-anchor='middle' dominant-baseline='middle' font-size='2em' font-weight='bold' fill='%232c5282' fill-opacity='0.15' transform='rotate(-45 100 75)'>河南铭书教育</text></svg>");
        background-size: 200px 150px;
    }
}