@media (max-width: 900px) {
    .sidebar {
        width: 220px;
    }
    .main-content {
        margin-left: 220px;
    }
}

.sidebar-toggle {
    display: none;
    position: fixed;
    top: 10px;
    left: 10px;
    z-index: 200;
    background-color: #3498db;
    color: #ecf0f1;
    border: none;
    border-radius: 5px;
    width: 44px;
    height: 44px;
    font-size: 24px;
    cursor: pointer;
}

@media (max-width: 768px) {
    .sidebar-toggle {
        display: block;
    }
    .sidebar {
        width: 280px;
        height: 100vh;
        position: fixed;
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }
    .sidebar.open {
        transform: translateX(0);
    }
    .main-content {
        margin-left: 0;
        padding-top: 60px;
    }
}