.atnav-container {
    position: relative;
    width: 100%;
    max-width: 320px;
    font-family: inherit;
    box-sizing: border-box;
}

.atnav-container-preview-label {
    font-size: 11px;
    color: #888;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin: 0 0 4px 0;
}

.atnav-header {
    width: 100%;
    padding: 12px 18px;
    background: transparent;
    border: 2px solid currentColor;
    font-size: 15px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 4px;
    transition: all 0.3s ease;
}

.atnav-arrow {
    font-size: 10px;
    transition: transform 0.3s ease;
}

.atnav-header[aria-expanded="true"] .atnav-arrow {
    transform: rotate(180deg);
}

.atnav-list {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    margin: 6px 0 0 0;
    padding: 0;
    list-style: none;
    z-index: 999;
    border-radius: 4px;
    overflow: hidden;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.atnav-item {
    transition: background-color 0.2s ease;
}

.atnav-item:hover {
    background-color: rgba(174, 39, 33, 0.85) !important; /* Burgundy_2 slightly darker */
}

.atnav-link {
    display: block;
    padding: 12px 18px;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    width: 100%;
    box-sizing: border-box;
    transition: padding-left 0.2s ease;
}

.atnav-item:hover .atnav-link {
    padding-left: 22px;
}