/* Shared only by hub and homework pages, never presentation decks. */
body {
    padding-bottom: 100px !important;
}

a.hub-return-link {
    position: fixed;
    left: max(16px, env(safe-area-inset-left));
    bottom: calc(20px + env(safe-area-inset-bottom));
    z-index: 999;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-height: 48px;
    padding: 12px 18px;
    border: 2px solid #ffffff;
    border-radius: 999px;
    background: #18243b;
    color: #ffffff;
    box-shadow: 0 4px 18px rgba(0, 0, 0, .25);
    font: 700 15px/1.2 system-ui, sans-serif;
    text-decoration: none;
}

a.hub-return-link:hover {
    background: #29436b;
    color: #ffffff;
    text-decoration: none;
}

a.hub-return-link:focus-visible {
    outline: 3px solid #ffcf57;
    outline-offset: 3px;
}

@media (max-width: 600px) {
    body { padding-bottom: 180px !important; }
    /* Keep clear of homework score badges at the bottom-right. */
    a.hub-return-link {
        left: 12px;
        bottom: calc(105px + env(safe-area-inset-bottom));
    }
}

@media print {
    a.hub-return-link { display: none !important; }
    body { padding-bottom: 0 !important; }
}