/* Base reset */
.koa-nav,
.koa-menu,
.koa-submenu {
    list-style: none;
    margin: 0;
    padding: 0;
}

.koa-nav {
    background: #222;
    font-family: sans-serif;
}

.koa-menu a {
    display: block;
    padding: 12px 16px;
    color: white;
    text-decoration: none;
}

.koa-menu a:hover {
    background: #444;
}

/* Mobile first layout */
.koa-menu {
    display: none;
    flex-direction: column;
}

.koa-menu.open {
    display: flex;
}

.has-submenu > a::after {
    content: " ▾";
    font-size: 0.8em;
}

/* Submenus */
.koa-submenu {
    display: none;
    background: #333;
}

.has-submenu.open > .koa-submenu {
    display: block;
}

/* Toggle button */
.koa-nav-toggle {
    background: #222;
    color: white;
    border: none;
    padding: 12px 16px;
    font-size: 16px;
    width: 100%;
    text-align: left;
    cursor: pointer;
}

.koa-submenu {
    transition: max-height 0.3s ease;
}

/* Desktop styles */
@media (min-width: 768px) {
    .koa-nav-toggle {
        display: none;
    }

    .koa-menu {
        display: flex;
        flex-direction: row;
    }

    .koa-menu > li {
        position: relative;
    }

    .koa-submenu {
        position: absolute;
        left: 0;
        top: 100%;
        min-width: 200px;
    }

    .koa-submenu .koa-submenu {
        left: 100%;
        top: 0;
    }
}