/* Mobile app navigation uses the shared Ink Vessel palette. */
.mobile-tabbar, .mobile-menu { display: none; }

@media (max-width: 767px) {
    :root { --mobile-nav-height: calc(72px + env(safe-area-inset-bottom, 0px)); }
    html { scroll-padding-bottom: calc(var(--mobile-nav-height) + 16px); }
    body { padding-bottom: var(--mobile-nav-height); }
    html.mobile-menu-open, .mobile-menu-open body { overflow: hidden; }
    .has-mobile-navigation .navbar-toggler, .has-mobile-navigation .header-menu.collapse { display: none; }
    .sticky-download { display: none; }
    .site-footer { padding-bottom: 32px; }
    .scroll-to-top-btn { bottom: calc(var(--mobile-nav-height) + 14px); }

    .mobile-tabbar {
        position: fixed;
        inset: auto 0 0;
        z-index: 1035;
        display: grid;
        grid-template-columns: repeat(5, minmax(0, 1fr));
        min-height: var(--mobile-nav-height);
        padding: 5px max(8px, env(safe-area-inset-right, 0px)) env(safe-area-inset-bottom, 0px) max(8px, env(safe-area-inset-left, 0px));
        border-top: 1px solid var(--line);
        border-radius: 22px 22px 0 0;
        background: var(--surface);
        box-shadow: 0 -6px 28px #1212120d;
    }
    .mobile-tab {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 5px;
        min-width: 0;
        min-height: 66px;
        border-radius: 14px;
        color: var(--muted);
        font: 800 10px/1.25 var(--font-body);
        text-decoration: none;
    }
    .mobile-tab > span:not(.mobile-tab-download-icon) { max-width: 100%; overflow-wrap: anywhere; text-align: center; }
    .mobile-tab > .ui-icon { width: 23px; height: 23px; }
    .mobile-tab[aria-current], .mobile-tab.is-current, .mobile-tab[aria-expanded="true"] { color: var(--accent); background: var(--accent-soft); }
    .mobile-tab:hover { color: var(--accent); }
    .mobile-tab:focus-visible { outline-offset: -3px; }
    .mobile-tab-download { justify-content: flex-end; padding-bottom: 9px; color: var(--ink); }
    .mobile-tab-download-icon { display: grid; place-items: center; width: 48px; height: 44px; margin-top: -16px; border: 3px solid var(--surface); border-radius: 16px; background: var(--accent); color: var(--on-accent); box-shadow: 0 3px 0 var(--accent-hover); }
    .mobile-tab-download-icon .ui-icon { width: 22px; height: 22px; stroke-width: 2; }

    .mobile-menu {
        position: fixed;
        inset: auto 0 max(8px, env(safe-area-inset-bottom, 0px));
        width: calc(100% - 16px);
        max-width: 600px;
        height: min(760px, 88dvh);
        max-height: calc(100dvh - 24px);
        margin: 0 auto;
        padding: 0;
        border: 1px solid var(--line);
        border-radius: 26px;
        background: var(--page);
        color: var(--ink);
        box-shadow: 0 16px 70px #0005;
        overflow: hidden;
    }
    .mobile-menu[open] { display: flex; flex-direction: column; animation: mobile-menu-enter .18s ease-out; }
    .mobile-menu::backdrop { background: #15100c85; backdrop-filter: blur(4px); }
    .mobile-menu-header { display: flex; flex: none; align-items: center; justify-content: space-between; gap: 16px; padding: 20px 20px 16px; border-bottom: 1px solid var(--line); }
    .mobile-menu-eyebrow { display: block; color: var(--accent); font: 800 11px/1.4 var(--font-body); letter-spacing: .12em; }
    .mobile-menu-header h2 { margin: 3px 0 0; font-size: 30px; }
    .mobile-menu-close { display: grid; flex: none; place-items: center; width: 44px; height: 44px; border: 1px solid var(--line); border-radius: 50%; background: var(--surface); color: var(--ink); }
    .mobile-menu-content { min-height: 0; padding: 20px; overflow-y: auto; overscroll-behavior: contain; scrollbar-width: thin; }
    .mobile-menu-shortcuts { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; }
    .mobile-menu-shortcuts a { display: flex; align-items: center; justify-content: center; flex-direction: column; gap: 8px; min-height: 76px; padding: 8px 2px; border: 1px solid var(--line); border-radius: 14px; background: var(--surface); color: var(--ink); font-size: 10px; font-weight: 800; text-align: center; }
    .mobile-menu-shortcuts .ui-icon { width: 22px; height: 22px; color: var(--accent); }
    .mobile-menu-section { margin-top: 26px; }
    .mobile-menu-section h3 { margin-bottom: 12px; font: 800 11px/1.5 var(--font-body); color: var(--muted); text-transform: uppercase; letter-spacing: .08em; }
    .mobile-menu-group { margin-top: 8px; border: 1px solid var(--line); border-radius: 12px; background: var(--surface); overflow: hidden; }
    .mobile-menu-group summary { display: flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 54px; padding: 12px 14px; cursor: pointer; list-style: none; color: var(--ink); font-size: 13px; font-weight: 800; }
    .mobile-menu-group summary::-webkit-details-marker { display: none; }
    .mobile-menu-group summary:focus-visible { outline: 2px solid var(--accent); outline-offset: -3px; }
    .mobile-menu-group summary .ui-icon { width: 18px; height: 18px; color: var(--accent); transition: transform .18s; }
    .mobile-menu-group[open] summary .ui-icon { transform: rotate(180deg); }
    .mobile-menu-group[open] summary { border-bottom: 1px solid var(--line); }
    .mobile-menu-group ul { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2px; margin: 0; padding: 8px; list-style: none; }
    .mobile-menu-group a { display: flex; align-items: center; min-height: 44px; padding: 8px; border-radius: 8px; color: var(--ink); font-size: 12px; font-weight: 600; line-height: 1.4; }
    .mobile-menu-group a[aria-current], .mobile-menu-links a[aria-current] { background: var(--accent-soft); color: var(--accent); }
    .mobile-menu-links { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
    .mobile-menu-links a { display: flex; align-items: center; min-height: 48px; padding: 10px 12px; border: 1px solid var(--line); border-radius: 10px; color: var(--ink); background: var(--surface); font-size: 12px; font-weight: 600; line-height: 1.5; }
    .mobile-menu-support { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
    .mobile-menu-support a { display: flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; border: 1px solid var(--line); border-radius: 10px; background: var(--surface); color: var(--ink); font-size: 12px; font-weight: 800; }
    .mobile-menu-support .ui-icon { width: 18px; height: 18px; color: var(--accent); }
    .mobile-menu-responsible { display: flex; flex-wrap: wrap; gap: 0 16px; margin-top: 8px; }
    .mobile-menu-responsible a { display: inline-flex; align-items: center; min-height: 44px; font-size: 11px; font-weight: 700; }
    .mobile-menu-actions { display: grid; grid-template-columns: 1fr 1.2fr; gap: 8px; margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--line); }
    .mobile-menu-actions > * { display: flex; align-items: center; justify-content: center; gap: 8px; min-height: 48px; border: 1px solid var(--line); border-radius: 12px; font: 800 11px/1.4 var(--font-body); }
    .mobile-menu-actions .ui-icon { width: 19px; height: 19px; }
    .mobile-menu-theme { background: var(--surface); color: var(--ink); }
    .mobile-menu-download { background: var(--accent); color: var(--on-accent); }
    .mobile-menu-download:hover { background: var(--accent-hover); color: var(--on-accent); }
    @keyframes mobile-menu-enter { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
}

@media (prefers-reduced-motion: reduce) {
    .mobile-menu[open] { animation: none; }
    .mobile-menu-group summary .ui-icon { transition: none; }
}