/* 重置基础样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    /* 确保背景和内容可以正确定位 */
    position: relative;
    overflow: hidden;
    height: 100vh;
    background: transparent;
}

/* 最底层背景 */
#bg {
    /* 固定背景 */
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    /* 背景图片路径 */
    background-image: url('../image/bg.png');
    background-position: center;
    background-size: cover;
    background-repeat: no-repeat;
    background-attachment: fixed;
}

/* 菜单窗口 */
#menu-window {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 50px;
    z-index: 1000;
}

/* 确保菜单项文字样式统一 */
#menu-window span {
    color: #fcfcfc;
    font-size: 14px;
    user-select: none;
}

/* 主体内容窗口 */
#zhu {
    position: fixed;
    top: 60px;
    left: 7.5%;
    right: 7.5%;
    width: calc(100% - 15%);
    height: calc(100vh - 40px - 50px);
    z-index: 1;
    overflow: auto;
}

/* 备案窗口 */
#beian-window {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 20px;
    z-index: 1000;
    backdrop-filter: blur(30px);
    background-color: rgba(100, 100, 100, 0.2);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 12px;
    line-height: 18px;
    text-align: center;
}

/* 备案窗口内所有元素垂直居中 */
#beian-window * {
    vertical-align: middle;
}