#main-menu {
    position: fixed;
    /* 40px Brick Height + 2px Border/Gap = 42px */
    bottom: 42px; 
    left: 4px;
    width: 220px;
    
    background: var(--ui-face);
    color: var(--ui-text);
    
    border-top: 2px solid var(--ui-light);
    border-left: 2px solid var(--ui-light);
    border-right: 2px solid var(--ui-dark);
    border-bottom: 2px solid var(--ui-dark);
    box-shadow: 4px 4px 0px rgba(0,0,0,0.5);
    
    display: none;
    flex-direction: row; /* Sidebar + List */
    z-index: 6000;
    padding: 4px;
}

.menu-sidebar {
    background: linear-gradient(#000080, #1084d0);
    color: white;
    padding: 4px;
    font-weight: bold;
    font-size: 18px;
    text-align: right;
    min-width: 24px;
    writing-mode: vertical-rl;
    transform: rotate(180deg);
}

.menu-list-container {
    flex-grow: 1;
    background: var(--ui-face);
}

.menu-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.menu-item {
    padding: 6px 12px;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 14px;
    position: relative;
    color: var(--ui-text);
}

.menu-item:hover {
    background: #000080;
    color: white;
}

.menu-separator {
    height: 1px;
    background: var(--ui-dark);
    border-bottom: 1px solid var(--ui-light);
    margin: 4px 2px;
}

.has-submenu::after {
    content: "►";
    position: absolute;
    right: 8px;
    font-size: 10px;
}

.submenu {
    display: none;
    position: absolute;
    left: 100%;
    bottom: -4px;
    width: 180px;
    background: var(--ui-face);
    border: 2px solid var(--ui-text); /* Fallback */
    box-shadow: 4px 4px 0px rgba(0,0,0,0.5);
}

.menu-item:hover > .submenu {
    display: flex;
    flex-direction: column;
}