/* 根元素高度填充屏幕 */
html, body {
    width: 100%;
    height: 100%;
    margin: 0;
    padding: 0;
    font-family: verdana, arial, helvetica, sans-serif;
    font-size: 14px;
    color: #333;
    background-color: #fff;
}

/* 页面主容器布局，使用 body flex 替代原来的 #rootForm */
body {
    display: flex;
    flex-direction: column;
    align-items: stretch; /* 子元素宽度遵循自身 */
    min-height: 100vh;
}

/* header、content 宽度控制 */
#header,
#menu,
#content {
    width: 100%; /* 默认填满屏幕 */
    max-width: 1024px; /* 大屏最大宽度 */
    margin: 0 auto; /* 居中 */
}


/* header 布局 */
/* 设置min-height，解决Google AdSense广告占位高度跳动问题，在未加载广告时，高度不会变 */
#header {
    display: flex;
    padding: 5px 0 8px 0;
    min-height: 90px;
}


#logo {
    
}

#ad {
    flex: 2;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-end;
}

#nav {
    height: 50px;
    min-height: 50px; /* 最小高度，防止压缩 */
    display: flex;
    width: 100%;
    justify-content: center;
    align-items: center;
    background: #F0F6F0;
}

#menu {
    display: flex;   
    padding-left: 5px;
}

    #menu a {
        font-size: 20px;
        margin-right: 40px;
        display: flex;
        flex-direction: column;
        justify-content: center;
    }

.mainMenu {
    text-decoration: underline;
}

#menu .mainMenuSelected {
    color: #0078d7;
    text-decoration: none;
}


/* content 主区域 */
#content {
    flex: 1; /* 占满剩余高度 */
    display: flex;
    flex-direction: column;
}


/* copyright */
#copyright {
    height: 55px;
    min-height: 55px; /* 最小高度，防止压缩 */
    width: 100%;
    font-size: 12px;
    background: #F0F6F0;
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
}

/* 链接样式 */
a:link {
    color: #2955A0;
    text-decoration-line: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 4px;
}