/**
 * Шапка лендинга: ссылки в строке, при нехватке места — список по кнопке «Разделы» (см. landing-nav.js).
 */

body.landing-page .landing-nav-burger {
    display: none;
    align-items: center;
    justify-content: center;
    gap: 6px;
    min-width: 44px;
    padding: 6px 12px;
}

body.landing-page .landing-nav-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 25;
    background: rgba(15, 23, 42, 0.45);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease;
}

body.landing-page .landing-nav-actions > .btn-primary-hero {
    display: none;
}

/* Режим «не влезло» — выпадающий список */
body.landing-page .landing-nav.landing-nav--menu-collapsed .landing-nav-burger {
    display: inline-flex;
}

body.landing-page .landing-nav.landing-nav--menu-collapsed {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-rows: auto;
}

body.landing-page .landing-nav.landing-nav--menu-collapsed .landing-nav-left {
    grid-column: 1;
    grid-row: 1;
    max-width: none;
}

body.landing-page .landing-nav.landing-nav--menu-collapsed .landing-nav-actions {
    grid-column: 2;
    grid-row: 1;
}

body.landing-page .landing-nav.landing-nav--menu-collapsed .landing-nav-menu {
    display: none;
    position: fixed;
    top: calc(env(safe-area-inset-top, 0px) + 56px);
    left: max(12px, env(safe-area-inset-left, 0px));
    right: max(12px, env(safe-area-inset-right, 0px));
    z-index: 30;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 12px;
    border-radius: 16px;
    background: rgba(255, 255, 255, 0.98);
    border: 1px solid rgba(148, 163, 184, 0.35);
    box-shadow: 0 24px 60px rgba(15, 23, 42, 0.18);
    backdrop-filter: blur(16px);
    max-height: min(70vh, 520px);
    overflow-y: auto;
    overflow-x: hidden;
    mask-image: none;
    width: auto;
    font-size: 0.92rem;
}

body.landing-page .landing-nav.landing-nav--menu-collapsed.is-menu-open .landing-nav-menu {
    display: flex;
}

body.landing-page .landing-nav.landing-nav--menu-collapsed.is-menu-open .landing-nav-overlay {
    display: block;
    opacity: 1;
    pointer-events: auto;
}

body.landing-page .landing-nav.landing-nav--menu-collapsed .landing-nav-menu a {
    padding: 12px 14px;
    border-radius: 10px;
    white-space: normal;
}

body.landing-page .landing-nav.landing-nav--menu-collapsed .landing-nav-menu a:hover {
    background: rgba(59, 130, 246, 0.08);
}

[data-theme="dark"] body.landing-page .landing-nav.landing-nav--menu-collapsed .landing-nav-menu {
    background: rgba(15, 23, 42, 0.97);
    border-color: rgba(148, 163, 184, 0.25);
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.5);
}

[data-theme="dark"] body.landing-page .landing-nav.landing-nav--menu-collapsed .landing-nav-menu a:hover {
    background: rgba(59, 130, 246, 0.15);
}

/* Обычный режим: одна строка */
body.landing-page .landing-nav:not(.landing-nav--menu-collapsed) {
    grid-template-columns: auto minmax(0, 1fr) auto;
    grid-template-rows: auto;
}

body.landing-page .landing-nav:not(.landing-nav--menu-collapsed) .landing-nav-left {
    grid-column: 1;
    grid-row: 1;
}

body.landing-page .landing-nav:not(.landing-nav--menu-collapsed) .landing-nav-menu {
    grid-column: 2;
    grid-row: 1;
    display: flex;
    position: static;
    flex-direction: row;
    align-items: center;
    justify-content: center;
    width: auto;
    padding: 2px 4px;
    background: transparent;
    border: none;
    box-shadow: none;
    max-height: none;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
    mask-image: none;
}

body.landing-page .landing-nav:not(.landing-nav--menu-collapsed) .landing-nav-actions {
    grid-column: 3;
    grid-row: 1;
}

@container landing-shell (min-width: 721px) {
    body.landing-page section[id],
    body.landing-page .landing-block {
        scroll-margin-top: calc(88px + env(safe-area-inset-top, 0px));
    }
}

@container landing-shell (min-width: 1000px) {
    body.landing-page .landing-nav:not(.landing-nav--menu-collapsed) {
        grid-template-columns: minmax(0, 240px) minmax(0, 1fr) auto;
    }

    body.landing-page .landing-nav:not(.landing-nav--menu-collapsed) .landing-nav-left {
        max-width: 240px;
    }

    body.landing-page .landing-nav-actions > .btn-primary-hero {
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }
}

@container landing-shell (max-width: 999px) {
    body.landing-page .landing-brand-sub {
        display: -webkit-box;
        -webkit-line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        font-size: 0.62rem;
        line-height: 1.25;
        max-width: 12.5em;
    }

    body.landing-page .landing-nav:not(.landing-nav--menu-collapsed) .landing-nav-left {
        max-width: 200px;
    }

    body.landing-page .landing-nav:not(.landing-nav--menu-collapsed) .landing-nav-menu {
        justify-content: flex-start;
        font-size: 0.78rem;
        gap: 6px;
    }
}

@container landing-shell (max-width: 720px) {
    body.landing-page section[id],
    body.landing-page .landing-block {
        scroll-margin-top: calc(80px + env(safe-area-inset-top, 0px));
    }
}

body.landing-page .landing-nav-actions .theme-toggle-btn {
    min-width: 0;
    width: 2.25rem;
    height: 2.25rem;
    padding: 0;
    font-size: 1.05rem;
    line-height: 1;
}

@container landing-shell (max-width: 720px) {
    body.landing-page .landing-nav-left {
        max-width: 180px;
    }

    body.landing-page .landing-brand-title {
        white-space: normal;
        text-overflow: clip;
        line-height: 1.25;
    }

    body.landing-page .landing-nav-actions .theme-toggle-btn {
        width: 2.75rem;
        height: 2.75rem;
        font-size: 1.1rem;
    }

    body.landing-page .landing-nav-actions .btn-outline:not(.theme-toggle-btn):not(.landing-nav-burger) {
        min-height: 2.75rem;
        padding: 0 12px;
        display: inline-flex;
        align-items: center;
    }

    body.landing-page .landing-nav-burger span {
        display: none;
    }
}

@container landing-shell (min-width: 721px) {
    body.landing-page .landing-nav-burger span {
        display: inline;
    }
}

/* Fallback без container queries */
@supports not (container-type: inline-size) {
    @media (max-width: 999px) {
        body.landing-page .landing-brand-sub {
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            font-size: 0.62rem;
            line-height: 1.25;
            max-width: 12.5em;
        }
    }

    @media (min-width: 1000px) {
        body.landing-page .landing-nav-actions > .btn-primary-hero {
            display: inline-flex;
        }
    }
}