body {
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Arial, Helvetica, sans-serif;
}

ul {
    list-style-type: none;
    padding: 15px 0;
    margin: 0;
    
    background: rgba(173, 216, 230, 0.5); 
    
    width: 100%;
    
    border-bottom-left-radius: 0 20px 20px 0; 
    
}

li {
    position: relative;
}

li a {
    display: block;
    padding: 12px 15px;
    margin: 5px 15px; 
    
    background-color: rgba(255, 255, 255, 0.5); 
    color: #2c3e50;
    text-decoration: none;
    
    border-radius: 12px; 
    
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.05); 
    
    transition: all 0.3s ease; 
}

li a:hover {
    background-color: rgba(255, 255, 255, 0.9);
    box-shadow: 0 4px 10px rgba(0, 183, 244, 0.2);
    transform: translateY(-1px);
}

ul ul {
    display: none;
    position: relative; 
    top: 0;
    left: 0;
    background: transparent;
    box-shadow: none;
    
    padding: 0 0 10px 0; 
    
    border-radius: 0;
}

ul li.open > ul {
    display: block;
}

ul ul li a {
    background-color: rgba(255, 255, 255, 0.3); /* Più trasparenti rispetto ai principali */
    font-size: 14px; /* Testo leggermente più piccolo */
    padding: 10px 15px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.03);
}

ul ul li a:hover {
    background-color: rgba(255, 255, 255, 0.7);
}

ul > li:has(ul) > a::after {
    content: '▼';
    float: right;
    font-size: 11px;
    color: #555;
    margin-top: 2px;
    transition: transform 0.3s ease;
}

ul > li.open > a::after {
    content: '▲';
}

.demo {
    position: absolute;
    top: 0;
    left: 0;
    width: 80px;
    z-index: 10;
    pointer-events: none;
}

@media screen and (max-width: 768px) {
    .demo {
        width: 60px;
    }
    
    li a {
        padding: 12px 10px;
        margin: 5px 10px;
        font-size: 14px;
    }
}

@media screen and (max-width: 480px) {
    .demo {
        width: 50px;
    }
    
    li a {
        padding: 10px 8px;
        font-size: 13px;
    }
}