@media (max-width: 820px) {
    .hero,
    .action-grid,
    .controls,
    .practice-layout,
    .practice-layout > div:first-child,
    .difference-grid,
    .error-summary-grid,
    .practice-history-row,
    .comparison-grid,
    .live-summary,
    .score-grid,
    .metadata-grid {
        grid-template-columns: 1fr;
    }

    .page-heading,
    .topbar-inner {
        align-items: flex-start;
        flex-direction: column;
    }

    nav {
        width: 100%;
        justify-content: space-between;
    }

    .session-row {
        grid-template-columns: 1fr;
        gap: 5px;
    }

    .line-meta {
        grid-template-columns: 50px 58px 1fr;
    }

    .line-text {
        font-size: 25px;
    }
}