body {
    margin: 0;
    font-family: Arial, sans-serif;
}

/* Layout Desktop: Menü links, Inhalt rechts */
#main {
    display: flex;
    flex-direction: row;
}

#mainMenu {
    width: 220px;
    background: #f5f5f5;
    padding: 10px;
    height: 100vh;
    overflow-y: auto;
}

#content {
    flex: 1;
    padding: 10px;
}

/* Header + Hamburger */
.header-row {
    display: flex;
    justify-content: flex-end;
    padding: 10px;
}

.hamburger {
    width: 35px;
    cursor: pointer;
    display: none;
    z-index: 10000;
}

.hamburger span {
    display: block;
    height: 4px;
    background: #333;
    margin: 6px 0;
    border-radius: 2px;
}

/* Smartphone: Hamburger rechts, Menü Off-Canvas rechts */
@media (max-width: 1200px) {

    /* Hamburger sichtbar */
    .hamburger {
        display: block;
        position: fixed;
        right: 20px;
        top: 20px;
        z-index: 10000;
    }

    /* Menü rechts Off-Canvas */
    #mainMenu {
        position: fixed;
        right: -260px;
        top: 0;
        width: 260px;
        height: 100vh;
        background: #f5f5f5;
        padding: 10px;
        transition: right 0.3s ease;
        z-index: 9999;
    }

    #mainMenu.open {
        right: 0;
    }

    /* Inhalt soll volle Breite haben */
    #main {
        display: block; /* WICHTIG: kein column-flex */
    }
}