.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    display: flex;
    flex-direction: column;
    background: rgba(13, 16, 17, 0.92);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

.header-inner {
    width: min(100% - 2 * var(--gutter), var(--container));
    margin-inline: auto;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 1.5rem;
    min-height: 4.5rem;
}

.logo {
    display: flex;
    align-items: center;
    min-width: 0;
}

.logo-mark {
    color: #B7F34A;
    font-weight: 700;
    letter-spacing: 0.14em;
    font-size: 1.02rem;
}

.nav-desktop {
    display: flex;
    justify-content: center;
    align-items: stretch;
    gap: 0.15rem;
    height: 100%;
}

.nav-item {
    position: relative;
    display: flex;
    align-items: stretch;
}

.nav-link {
    display: flex;
    align-items: center;
    font-size: 0.9rem;
    color: var(--muted);
    position: relative;
    padding: 0.9rem 0.85rem;
}

.nav-link:hover,
.nav-link[aria-current="page"] {
    color: var(--text);
}

.nav-link[aria-current="page"]::after,
.nav-item:hover > .nav-link::after,
.nav-link:hover::after {
    content: "";
    position: absolute;
    left: 0.85rem;
    right: 0.85rem;
    bottom: 0.7rem;
    height: 1px;
    background: var(--accent);
}

.nav-panel {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(0.4rem);
    width: min(40rem, 78vw);
    padding: 1rem 1rem 1.1rem;
    background: var(--color-graphite);
    border: 1px solid var(--border);
    box-shadow: 0 18px 40px rgba(0, 0, 0, 0.35);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    z-index: 46;
    transition: opacity 0.18s var(--ease), transform 0.18s var(--ease), visibility 0.18s;
}

.nav-item:hover .nav-panel,
.nav-item:focus-within .nav-panel,
.nav-item.is-open .nav-panel {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateX(-50%) translateY(0);
}

.nav-panel-all {
    display: inline-flex;
    margin-bottom: 0.75rem;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--accent);
}

.nav-panel-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.4rem;
}

.nav-panel-link {
    display: grid;
    gap: 0.2rem;
    padding: 0.7rem 0.75rem;
    border: 1px solid transparent;
    background: var(--bg);
}

.nav-panel-link:hover,
.nav-panel-link[aria-current="page"] {
    border-color: var(--border);
}

.nav-panel-link b {
    font-family: var(--font-mono);
    font-size: 0.62rem;
    letter-spacing: 0.12em;
    color: var(--accent);
    font-weight: 500;
}

.nav-panel-link strong {
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text);
}

.nav-panel-link span {
    color: var(--muted);
    font-size: 0.8rem;
    line-height: 1.35;
}

.header-cta {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-toggle {
    display: none;
    width: 2.6rem;
    height: 2.6rem;
    border: 1px solid var(--border);
    color: var(--text);
    align-items: center;
    justify-content: center;
}

.nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(13, 16, 17, 0.97);
    z-index: 50;
    display: none;
    padding: 1.25rem var(--gutter) 2rem;
    overflow-y: auto;
    overscroll-behavior: contain;
}

.nav-overlay.is-open {
    display: flex;
    flex-direction: column;
}

.nav-overlay-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-h);
}

.nav-overlay nav {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    margin-top: 2rem;
}

.nav-overlay nav > a {
    font-size: clamp(1.5rem, 5.5vw, 2.4rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    text-transform: uppercase;
    border-bottom: 1px solid var(--border);
    padding: 0.7rem 0;
}

.nav-overlay .sub {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem 1rem;
    padding: 0.55rem 0 1rem;
    color: var(--muted);
    font-family: var(--font-mono);
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.nav-overlay .sub a {
    font-size: 0.78rem;
    font-weight: 500;
    border-bottom: 0;
    padding: 0.15rem 0;
    color: var(--muted);
}

.site-footer {
    border-top: 1px solid var(--border);
    padding: 3.5rem 0 2rem;
    background: var(--bg);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.2fr 1fr 1fr 1.1fr;
    gap: 2rem 1.5rem;
}

.footer-brand .logo-mark {
    margin-bottom: 0.85rem;
    font-size: 1.15rem;
}

.footer-title {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0 0 1rem;
}

.footer-links,
.footer-contacts {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 0.55rem;
}

.footer-links a:hover,
.footer-contacts a:hover {
    color: var(--accent);
}

.footer-legal {
    margin-top: 2.5rem;
    padding-top: 1.25rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    flex-wrap: wrap;
    color: var(--muted);
    font-size: 0.82rem;
}

.footer-legal-copy {
    display: grid;
    gap: 0.35rem;
    max-width: 46rem;
}

.footer-requisites {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.04em;
}

.footer-legal a:hover {
    color: var(--text);
}

.to-top {
    position: fixed;
    right: 1.1rem;
    bottom: 1.1rem;
    z-index: 35;
    width: 2.75rem;
    height: 2.75rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border);
    background: rgba(13, 16, 17, 0.92);
    color: var(--text);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.to-top:hover {
    border-color: var(--color-signal);
    color: var(--color-signal);
}

.to-top[hidden] {
    display: none;
}

@media (max-width: 1100px) {
    .nav-panel {
        width: min(36rem, 86vw);
        left: auto;
        right: 0;
        transform: translateY(0.4rem);
    }

    .nav-item:hover .nav-panel,
    .nav-item:focus-within .nav-panel,
    .nav-item.is-open .nav-panel {
        transform: translateY(0);
    }
}

@media (max-width: 1024px) {
    :root {
        --header-h: 4.5rem;
    }

    .nav-desktop {
        display: none;
    }

    .nav-toggle {
        display: inline-flex;
    }

    .header-inner {
        grid-template-columns: auto 1fr auto;
        min-height: var(--header-h);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 640px) {
    .header-inner {
        gap: 0.6rem;
    }

    .header-cta {
        gap: 0.45rem;
    }

    .logo-mark {
        font-size: 0.92rem;
    }

    .header-cta .btn span {
        display: none;
    }

    .footer-grid {
        grid-template-columns: 1fr;
    }
}