.app-shell {
    height: 100vh;
    display: flex;
    overflow: hidden;
}

.main-column {
    flex: 1;
    min-width: 0;
    min-height: 0;
    display: flex;
    flex-direction: column;
}

.main-region {
    flex: 1;
    min-width: 0;
    overflow-y: auto;
    padding: 24px var(--top-region-pad-x);
}