:root {
    --nav-w:    230px;
    --panel-w:  460px;
    --col-max: 1300px;
    --col-pad:   1rem;

    --pageHeader-h: 72px;

    --pageNav-h: 46px;

    --app-header-h:  64px;

    --rail-left:  0px;
    --rail-right: 0px;
}

/* ── Where a jumped-to heading lands ─────────────────────────────────────── */
html {
    scroll-padding-top: var(--scroll-offset, 150px);
}

.app-header {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 0 2rem;
    height: 64px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
}
.scrolledDown .app-header {
    box-shadow: var(--shadow-down);
}

.corePage { position: relative; }

.coreInnerPage {
    padding-left:  var(--rail-left);
    padding-right: var(--rail-right);
    transition: padding-left 0.2s ease, padding-right 0.16s ease;
}

/* The two rail states. Everything that has to dodge a rail reads the knobs,
   so a new rail (or a new breakpoint) is one line here, not a hunt. */
body.fap-menu-active { --rail-left:  var(--nav-w); }
body.prp-docked      { --rail-right: var(--panel-w); }

.middleColumn,
.headerMiddleColumn {
    max-width: var(--col-max);
    margin: 0 auto;
    padding-left:  var(--col-pad);
    padding-right: var(--col-pad);
    box-sizing: border-box;
}

.pageHeader {
    grid-column: 1 / -1;
    height: var(--pageHeader-h);
    box-sizing: border-box;
    margin-bottom: 1.25rem;
    overflow: hidden;

    container: pageHeader / inline-size;
}

.pageHeader > .headerMiddleColumn {
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.pageHeader-crumb {
    font-size: var(--fs-xs);
    line-height: 1.35;
    margin-bottom: 0.25rem;
    color: var(--text-muted);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.pageHeader-crumb a       { color: var(--text-muted); text-decoration: none; }
.pageHeader-crumb a:hover { color: var(--primary-color, #3b82f6); }
.pageHeader-crumb .sep    { color: var(--border-color); margin: 0 0.35rem; }

.pageHeader-row {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    gap: 0.5rem 0.85rem;
    min-width: 0;
}

.pageHeader-row > * { min-width: 0; }

.pageHeader-row > h1        { flex: 0 1 auto; overflow: hidden; }
.pageHeader-row > h1 > span,
.pageHeader-row > h1 > .headerTitleText {
    min-width: 200px;
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
    display: inline-block;
}
.pageHeader-row > h1 > button { flex: 0 0 auto; }

.pageHeader-row > .badges     { flex: 0 1 auto; flex-wrap: nowrap; overflow: hidden; }
.pageHeader-row > .sourceIcons { flex: 0 1 auto; overflow: hidden; }

.pageHeader-row h1 {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    margin: 0;
    font-size: var(--fs-2xl);
    line-height: 1;
    letter-spacing: -0.01em;
    min-width: 300px;
}

.pageHeader-row .badges { margin: 0; }

@media (max-width: 700px) {
    .pageHeader-row h1 { font-size: var(--fs-lg); }
}

.pageNav.pageNav {
    --pageNav-gutter: max(
        var(--col-pad),
        calc((100% - var(--rail-left) - var(--rail-right) - var(--col-max)) / 2 + var(--col-pad))
    );

    position: fixed;
    top: calc(var(--app-header-h, 64px) + var(--pageHeader-h, 72px));
    left:  var(--rail-left);
    right: var(--rail-right);
    z-index: 80;

    height: var(--pageNav-h);
    box-sizing: border-box;
    margin: 0;

    align-items: stretch;
    flex-wrap: nowrap;
    gap: 0;

    background: var(--bg-card, #fff);
    border-bottom: 1px solid var(--border-color, #e2e6f0);
    box-shadow: none;
    transition: box-shadow 0.18s ease;

    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;

    padding-top: 0;
    padding-bottom: 0;
    padding-left:  var(--pageNav-gutter);
    padding-right: var(--pageNav-gutter);
}
.pageNav.pageNav::-webkit-scrollbar { display: none; }

.pageNav.pageNav--sub {
    top: calc(var(--app-header-h, 64px) + var(--pageHeader-h, 72px) + var(--pageNav-h, 46px));
    z-index: 79;
}

.pageNav.pageNav > * {
    flex: 0 0 auto;
    align-self: stretch;
    display: inline-flex;
    align-items: center;
    margin-bottom: 0;
    white-space: nowrap;
}

.scrolledDown .pageNav.pageNav { box-shadow: var(--shadow-down); }

.pageHeader--nav {
    margin-bottom: calc(var(--pageNav-h) + 1.25rem);
}
main.navMode_tabs .pageHeader--navGated {
    margin-bottom: calc(var(--pageNav-h) + 1.25rem);
}
main.navMode_tabs .fap-nav-content:has(.fap-sub-tabs.active) .pageHeader--navGated {
    margin-bottom: calc(2 * var(--pageNav-h) + 1.25rem);
}

.bandColumn {
    padding-left:  max(var(--col-pad), calc((100% - var(--col-max)) / 2 + var(--col-pad)));
    padding-right: max(var(--col-pad), calc((100% - var(--col-max)) / 2 + var(--col-pad)));
    box-sizing: border-box;
}

main.main-content {
    padding: 0 0 2rem 0;
    min-height: calc(100vh - 300px);
}

aside.fap-side-menu {
    display: none;
    position: fixed;
    top: var(--app-header-h, 64px);
    left: 0;
    bottom: 0;
    width: var(--nav-w);
    background: var(--bg-card, #fff);
    border-right: 1px solid var(--border-color, #e2e6f0);
    overflow-y: auto;
    padding: 1rem 0.5rem;
    z-index: 25;
}

.app-footer {
    --ftr-bg:      var(--bg-surface-2);
    --ftr-text:    var(--text-main);
    --ftr-muted:   var(--text-muted);
    --ftr-heading: var(--text-main);
    --ftr-strong:  var(--accent-primary);
    --ftr-accent:  var(--primary-color);
    --ftr-rule:    var(--border-color);
    --ftr-chip:    var(--hover-bg);

    margin-top: 3rem;
    border-top: 3px solid var(--bg-tinted);
    background-color: var(--ftr-bg);
    color: var(--ftr-text);
    font-size: var(--fs-md);
}

.app-footer .footer-top {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 2.5rem;
    padding: 12px;
}

.app-footer .footer-brand { max-width: 360px; }

.app-footer .footer-logo {
    display: inline-block;
    font-size: var(--fs-xl);
    font-weight: 700;
    color: var(--ftr-heading);
    text-decoration: none;
    letter-spacing: 0.01em;
}
.app-footer .footer-logo span { color: var(--ftr-accent); }
.app-footer .footer-logo:hover { color: var(--ftr-strong); }

.app-footer .footer-tagline {
    margin: 0.75rem 0 0;
    line-height: 1.55;
    color: var(--ftr-muted);
    font-size: var(--fs-sm);
}

.app-footer .footer-social { margin-top: 1.1rem; }
.app-footer .footer-social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background: var(--ftr-chip);
    border: 1px solid var(--ftr-rule);
    color: var(--ftr-text);
    font-size: var(--fs-lg);
    text-decoration: none;
    transition: background-color 0.15s ease, color 0.15s ease,
                border-color 0.15s ease, transform 0.15s ease;
}
.app-footer .footer-social-link:hover {
    background: var(--ftr-accent);
    border-color: var(--ftr-accent);
    color: var(--on-accent);
    transform: translateY(-2px);
}

.app-footer .footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: 3rem;
}
.app-footer .footer-col-title {
    margin: 0 0 0.85rem;
    font-size: var(--fs-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--ftr-heading);
}
.app-footer .footer-col ul {
    list-style: none;
    margin: 0;
    padding: 0;
}
.app-footer .footer-col li { margin-bottom: 0.6rem; }
.app-footer .footer-col a {
    color: var(--ftr-text);
    text-decoration: none;
    transition: color 0.15s ease;
}
.app-footer .footer-col a:hover {
    color: var(--ftr-strong);
    text-decoration: underline;
    text-underline-offset: 3px;
}

.app-footer .footer-bottom {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 0.5rem 1.5rem;
    padding: 1.1rem 0 1.4rem;
    border-top: 1px solid var(--ftr-rule);
    font-size: var(--fs-xs);
    color: var(--ftr-muted);
}
.app-footer .footer-bottom a {
    color: var(--ftr-muted);
    text-decoration: none;
}
.app-footer .footer-bottom a:hover {
    color: var(--ftr-strong);
    text-decoration: underline;
    text-underline-offset: 3px;
}

@media (max-width: 640px) {
    .app-footer { margin-top: 2rem; }

    .app-footer .footer-top {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 2rem;
        padding: 2.25rem 0 1.5rem;
    }

    .app-footer .footer-brand { max-width: 30rem; }
    .app-footer .footer-social { text-align: center; }

    .app-footer .footer-links {
        width: 100%;
        justify-content: center;
        gap: 2.5rem 3.5rem;
        text-align: center;
    }
    .app-footer .footer-col { min-width: 8rem; }

    .app-footer .footer-bottom {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 0.4rem;
    }
}

@media (max-width: 480px) {
    .app-footer .footer-top,
    .app-footer .footer-bottom {
        padding-left:  1.35rem;
        padding-right: 1.35rem;
    }
    .app-footer .footer-top { padding-top: 2rem; }

    .app-footer .footer-links {
        flex-direction: column;
        gap: 1.75rem;
    }

    .app-footer .footer-bottom {
        padding-top: 1.1rem;
        padding-bottom: 1.5rem;
    }
}

@media (max-width: 900px) {
    :root { --nav-w: 200px; }
}
@media (max-width: 700px) {
    body.fap-menu-active { --rail-left: 0px; }
    body:not(.fapnav-undocked) main.navMode_menu aside.fap-side-menu,
    body:not(.fapnav-undocked) main.navMode_scroll aside.fap-side-menu {
        position: relative;
        top: auto;
        left: auto;
        bottom: auto;
        width: 100%;
        border-right: none;
        border-bottom: 1px solid var(--border-color, #e2e6f0);
        margin-bottom: 1rem;
    }
}
@media (max-width: 560px) {
    /* Panel goes full-width drawer down here - no rail to reserve.
       Mirrored in PubRefsPop.css, which loads later; keep the two in step. */
    body.prp-docked { --rail-right: 0px; }
}


/* ═══════════════════════════════════════════════════════════════════════════
   MOBILE — the page skeleton below 820px
   ═══════════════════════════════════════════════════════════════════════════ */

@media (max-width: 820px) {
    :root {
        --col-pad: 0.6rem;          /* page column gutter: 1rem → 0.6rem     */
        --pageHeader-h: 58px;       /* one line of title, no badge row       */
    }

    .app-header {
        padding: 0 0.6rem;
        gap: 0.35rem;
    }

    /* The title row: the desktop min-widths (300px on the h1, 200px on the
       title text) are there to stop the badges crowding the name out. With no
       badges left to crowd it (below), they only force an overflow. */
    .pageHeader-row h1 { min-width: 0; }
    .pageHeader-row > h1 > span,
    .pageHeader-row > h1 > .headerTitleText { min-width: 0; }

    .pageHeader-row > .badges,
    .pageHeader-row > .sourceIcons,
    .pageHeader-row > .sourceIconGroups { display: none; }

    .pageHeader { margin-bottom: 0.75rem; }

    main.navMode_tabs .pageHeader--navGated,
    main.navMode_tabs .fap-nav-content:has(.fap-sub-tabs.active) .pageHeader--navGated {
        margin-bottom: 0.75rem;
    }

    main.main-content { padding-bottom: 1.25rem; }
}