body {
    display: flex;
    flex-direction: row;
    margin: 0;
    font-family: Arial, sans-serif;
    height: 100vh;
}

#menu {
    background-color: #18191A;
    color: #9891FF;
    padding: 16px;
    width: 260px;
    height: 100vh;
    box-sizing: border-box;
}

#menu .menu-column {
    width: 100%;
}

#menu ul {
    list-style-type: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 8px; /* 减小垂直间距，原为15px */
}

#menu li {
    margin: 0;
}

#menu a {
    font-weight: bold;
    color: #9891FF;
    text-decoration: none;
    display: block;
    padding: 4px 0; /* 减小上下内边距，原为8px 0 */
}

#menu a:hover {
    text-decoration: underline;
}

#menu a.active {
    font-weight: bold;
    color: #FF9891;
}

#content {
    flex: 1;
    padding: 0;
    overflow: auto;
}

.iframe-container {
    width: 100%;
    height: 100vh;
    overflow: hidden;
    position: relative;
}

.iframe-container iframe {
    width: calc(100% - 20px);
    height: calc(100% + 20px);
    border: none;
    position: absolute;
    top: 0;
    left: 0;
    overflow: auto;
}