.menu-links {
    max-width: 700px;
    margin: auto;
    font-family: Arial, sans-serif;
}

details {
    background: #fff;
    border: 1px solid #ddd;
    border-radius: 12px;
    margin-bottom: 12px;
    overflow: hidden;
    transition: 0.3s;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

details:hover {
    box-shadow: 0 4px 15px rgba(0,0,0,0.10);
}

summary {
    list-style: none;
    cursor: pointer;
    padding: 18px 22px;
    font-size: 1.1rem;
    font-weight: bold;
    background: #f8f9fb;
    transition: 0.2s;
}

summary:hover {
    background: #eef2f7;
}

summary::-webkit-details-marker {
    display: none;
}

summary::after {
    content: "▸";
    float: right;
    transition: transform 0.25s ease;
}

details[open] summary::after {
    transform: rotate(90deg);
}

.sub-menu {
    padding: 10px 20px 20px;
}

.sub-menu a {
    display: block;
    text-decoration: none;
    color: #333;
    padding: 12px 15px;
    border-radius: 8px;
    transition: 0.2s;
}

.sub-menu a:hover {
    background: #f2f5f9;
    transform: translateX(5px);
}