body {
    font-family: var(--font-family-base);
    margin: 0;
    padding: 0;
    background-color: #f8f9fa;
}

/* Layout principal */
#mainContent {
    margin-left: var(--sidebar-width);
    margin-top: var(--header-height);
    padding: 1rem;
    transition: margin-left 0.3s ease;
}

.sidebar.collapsed ~ #mainContent {
    margin-left: var(--sidebar-collapsed-width);
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
}

.sidebar-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1045;
    display: none;
}

@media (max-width: 768px) {
    #mainContent {
        margin-left: 0;
    }
    
    .sidebar.show ~ .sidebar-overlay {
        display: block;
    }
}

.theme-transitions * {
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}