.system-row { transition: background 0.1s; }
.system-row:hover td { background-color: #f0f7ff !important; cursor: pointer; }

.nav-dropdown { position: relative; }
.nav-dropdown-menu {
    display: none;
    position: absolute;
    right: 0;
    top: 100%;
    padding-top: 0.5rem;
    min-width: 180px;
    z-index: 300;
}
.nav-dropdown-menu-inner {
    background: white;
    border: 1px solid #e0e0e0;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    overflow: hidden;
}
.nav-dropdown:hover .nav-dropdown-menu { display: block; }
.nav-dropdown-menu a {
    display: block;
    padding: 0.6rem 1rem;
    text-decoration: none;
    color: #333;
    font-size: 0.9rem;
}
.nav-dropdown-menu a:hover { background-color: #f5f5f5; }
.nav-dropdown-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: #888;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: inherit;
    padding: 0;
}
.nav-dropdown-btn:hover { color: #333; }