/* ETSA hybrid mobile browsing: vertical pages with selected sideways card rows. */
@media (max-width: 700px) {
    :root {
        --mobile-nav-height: 69px;
        --mobile-card-width: calc(100% - 48px);
    }

    html {
        scroll-padding-top: calc(var(--mobile-nav-height) + 16px);
    }

    body {
        padding-top: var(--mobile-nav-height) !important;
        overflow-x: hidden !important;
        overflow-y: auto !important;
    }

    /* Keep the main navigation fixed while the page reads top to bottom. */
    .navbar {
        width: 100% !important;
        height: var(--mobile-nav-height) !important;
        min-height: var(--mobile-nav-height) !important;
        position: fixed !important;
        inset: 0 0 auto !important;
        z-index: 1000 !important;
        display: flex !important;
        flex-direction: row !important;
        align-items: center !important;
        justify-content: flex-start !important;
        gap: 18px !important;
        overflow: hidden !important;
        padding: 12px 18px !important;
        background: rgba(255, 255, 255, 0.97) !important;
        backdrop-filter: blur(10px);
    }

    .navbar-title,
    .brand {
        flex: 0 0 auto;
    }

    .navbar .nav-links {
        min-width: 0;
        flex: 1 1 auto;
        display: flex !important;
        flex-direction: row !important;
        flex-wrap: nowrap !important;
        align-items: center !important;
        justify-content: flex-start !important;
        gap: 18px !important;
        overflow-x: auto !important;
        padding: 8px 2px !important;
        scrollbar-width: none;
        white-space: nowrap;
        -webkit-overflow-scrolling: touch;
    }

    .navbar .nav-links::-webkit-scrollbar,
    .challenge-points::-webkit-scrollbar,
    .cards::-webkit-scrollbar,
    .steps::-webkit-scrollbar,
    .events-preview::-webkit-scrollbar,
    .partner-strip::-webkit-scrollbar,
    .hierarchy::-webkit-scrollbar,
    .project-choice-grid::-webkit-scrollbar,
    .brief-grid::-webkit-scrollbar,
    .process::-webkit-scrollbar,
    .score-list::-webkit-scrollbar,
    .opportunity-grid::-webkit-scrollbar,
    .contact-grid::-webkit-scrollbar,
    .overview-grid::-webkit-scrollbar,
    .highlight-grid::-webkit-scrollbar,
    .schedule-grid::-webkit-scrollbar,
    .challenge-meta::-webkit-scrollbar,
    .future-classes::-webkit-scrollbar {
        display: none;
    }

    .navbar .nav-links a {
        flex: 0 0 auto;
        font-size: 13px !important;
    }

    .mobile-nav,
    .mobile-section-nav,
    .mobile-page-progress {
        display: none !important;
    }

    /* The outer page returns to normal vertical document flow. */
    .mobile-page-deck,
    .mobile-page-deck > main {
        width: 100%;
        height: auto;
        display: block;
        overflow: visible;
    }

    .mobile-page-deck > .mobile-page,
    .mobile-page-deck > main > .mobile-page {
        width: auto;
        min-width: 0;
        height: auto;
        min-height: 0;
        overflow: visible;
        padding-bottom: initial;
        scroll-snap-align: none;
    }

    .mobile-page-deck > .hero.mobile-page,
    .mobile-page-deck > main > .hero.mobile-page {
        padding-top: 44px !important;
        grid-template-rows: none !important;
        align-content: normal !important;
        align-items: center !important;
    }

    .mobile-page-deck > .mobile-page-footer,
    .mobile-page-deck > main > .mobile-page-footer {
        display: block;
        padding: 26px 5% !important;
    }

    .challenge-layout {
        width: 100% !important;
        min-width: 0 !important;
        max-width: 100% !important;
        grid-template-columns: minmax(0, 1fr) !important;
    }

    /* Only repeated, compact content groups swipe sideways. */
    .challenge-points,
    .cards,
    .steps,
    .events-preview,
    .partner-strip,
    .hierarchy,
    .project-choice-grid,
    .brief-grid,
    .process,
    .score-list,
    .opportunity-grid,
    .contact-grid,
    .overview-grid,
    .highlight-grid,
    .schedule-grid {
        display: grid !important;
        width: 100% !important;
        min-width: 0 !important;
        max-width: 100% !important;
        grid-template-columns: none !important;
        grid-auto-flow: column !important;
        grid-auto-columns: var(--mobile-card-width) !important;
        align-items: stretch;
        gap: 14px !important;
        overflow-x: auto !important;
        overflow-y: hidden;
        overscroll-behavior-inline: contain;
        padding: 4px 0 14px !important;
        scroll-padding-inline: 0;
        scroll-snap-type: x mandatory;
        scrollbar-width: none;
        touch-action: pan-x pan-y;
        -webkit-overflow-scrolling: touch;
    }

    .challenge-points > *,
    .cards > *,
    .steps > *,
    .events-preview > *,
    .partner-strip > *,
    .hierarchy > *,
    .project-choice-grid > *,
    .brief-grid > *,
    .process > *,
    .score-list > *,
    .opportunity-grid > *,
    .contact-grid > *,
    .overview-grid > *,
    .highlight-grid > *,
    .schedule-grid > * {
        min-width: 0;
        height: auto;
        scroll-snap-align: start;
        scroll-snap-stop: always;
    }

    .challenge-meta,
    .future-classes {
        flex-wrap: nowrap !important;
        overflow-x: auto;
        padding-bottom: 10px;
        scroll-snap-type: x proximity;
        scrollbar-width: none;
        -webkit-overflow-scrolling: touch;
    }

    .challenge-meta > *,
    .future-classes > * {
        flex: 0 0 auto;
        scroll-snap-align: start;
    }

    .founder-card {
        width: auto !important;
        max-width: none !important;
        grid-column: auto !important;
        margin: 0 !important;
    }

    /* Standings and forms remain vertical and familiar. */
    .leaderboard tbody {
        overflow: visible !important;
        scroll-snap-type: none !important;
    }
}

@media (prefers-reduced-motion: reduce) {
    .challenge-points,
    .cards,
    .steps,
    .events-preview,
    .partner-strip,
    .hierarchy,
    .project-choice-grid,
    .brief-grid,
    .process,
    .score-list,
    .opportunity-grid,
    .contact-grid,
    .overview-grid,
    .highlight-grid,
    .schedule-grid {
        scroll-behavior: auto;
    }
}