:root {
    --primary: #2c5aa0;
    --light-bg: #f8f9fa;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Arial, Helvetica, sans-serif;
    line-height: 1.7;
    color: #333;
    display: flex;
    min-height: 100vh;
    background-color: #fff;
}

#sidebar {
    width: 190px;
    background-color: var(--light-bg);
    border-right: 1px solid #ddd;
    padding: 20px 15px;
    overflow-y: auto;
    flex-shrink: 0;
}

#separator {
    width: 1px;
    background-color: #eee;
    flex-shrink: 0;
}

#main {
    flex: 1;
    padding: 30px 40px;
    overflow-y: auto;
}

h1 {
    color: var(--primary);
    font-size: 2.1rem;
    margin-bottom: 20px;
}

h2 {
    color: #2c3e50;
    margin: 30px 0 15px;
}

a {
    color: var(--primary);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

ul.menu {
    list-style: none;
}

ul.menu li {
    margin: 10px 0;
}

.sub-menu {
    margin-left: 20px;
    font-size: 0.98rem;
}

/* Responsive design */
@media (max-width: 768px) {
    body {
        flex-direction: column;
    }
    #sidebar {
        width: 100%;
        border-right: none;
        border-bottom: 1px solid #ddd;
    }
    #separator {
        display: none;
    }
    #main {
        padding: 25px;
    }
/* Sub-menu styling */
.sub-menu {
    margin-left: 20px;
    font-size: 0.98rem;
}

.sub-menu .arrow {
    display: inline-block;
    width: 18px;
    color: var(--primary);
    font-weight: bold;
}

/* Optional: Make the whole sub-menu item slightly lighter */
.sub-menu a {
    color: #2c5aa0;
}
}