/* Sticky footer: #page-shell wraps <main> + site footer; overlays stay outside. */
#page-shell {
    display: flex;
    flex-direction: column;
    width: 100%;
    box-sizing: border-box;
    min-height: 100vh;
    min-height: 100svh;
    min-height: 100dvh;
}

#page-shell > main {
    flex: 1 1 auto;
    min-height: 0;
}