.main-nav {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: .25rem;
    padding: .6rem 1rem;
    background: #153a32;
    color: #fff;
    font: 1rem/1.5 system-ui, sans-serif;
    position: relative;
    z-index: 10;
}

.main-nav a,
.main-nav summary {
    display: block;
    padding: .5rem .75rem;
    color: inherit;
    text-decoration: none;
    border-radius: .25rem;
}

.main-nav a:hover,
.main-nav summary:hover,
.main-nav [aria-current="page"],
.main-nav .is-active>summary {
    background: #286251;
}

.main-nav a:focus-visible,
.main-nav summary:focus-visible {
    outline: 3px solid #ffda79;
    outline-offset: 2px;
}

.main-nav details {
    position: relative;
}

.main-nav summary {
    cursor: pointer;
}

.main-nav .main-nav__dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 14rem;
    max-height: 70vh;
    overflow: auto;
    background: #153a32;
    box-shadow: 0 8px 18px #0004;
}

.main-nav .main-nav__dropdown a {
    white-space: nowrap;
}

.main-nav .main-nav__empty {
    display: block;
    padding: .5rem .75rem;
}