html {
    scroll-padding-top: 112px;
}

.site-header {
    position: sticky;
    top: 12px;
    z-index: 50;
    flex-direction: row;
    align-items: center;
    gap: 20px;
    padding: 16px 20px;
    border: 1px solid var(--border-hover);
    border-radius: var(--radius-lg);
    background: rgba(17, 17, 24, 0.97);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(16px);
}

.site-header .brand {
    flex-shrink: 0;
}

.site-header .brand img {
    width: 110px;
    height: auto;
}

.site-header nav {
    justify-content: flex-end;
    gap: 4px;
    font-size: 13px;
}

.site-header nav a {
    padding: 10px 8px;
    color: #bcbcc8;
    font-weight: 600;
    white-space: nowrap;
}

.site-header nav a:hover,
.site-header nav a.active {
    color: #fff;
    background: rgba(124, 58, 237, 0.24);
}

.site-header nav .nav-portal {
    color: #fff;
    border: 1px solid rgba(139, 92, 246, 0.6);
    border-radius: 8px;
    background: rgba(124, 58, 237, 0.18);
}

.menu-toggle {
    display: none;
    align-items: center;
    gap: 10px;
    min-height: 44px;
    padding: 10px 14px;
    border: 1px solid var(--border-hover);
    border-radius: 8px;
    background: var(--card);
    color: var(--text);
    font: inherit;
    font-weight: 600;
    cursor: pointer;
}

.menu-toggle-icon {
    display: grid;
    gap: 4px;
    width: 20px;
}

.menu-toggle-icon span {
    height: 2px;
    background: currentColor;
}

.site-header a:focus-visible,
.menu-toggle:focus-visible {
    outline: 2px solid #a78bfa;
    outline-offset: 3px;
}

@media (max-width: 1000px) {
    .site-header {
        top: 8px;
        flex-wrap: wrap;
        justify-content: space-between;
        padding: 12px 16px;
        gap: 12px;
    }

    .site-header nav {
        width: 100%;
        flex-direction: column;
        gap: 4px;
        max-height: calc(100dvh - 140px);
        overflow-y: auto;
        border-top: 1px solid var(--border);
        padding-top: 12px;
    }

    .site-header nav a {
        padding: 12px;
        font-size: 15px;
    }

    .navigation-ready .menu-toggle {
        display: flex;
    }

    .navigation-ready .site-header:not(.menu-open) nav {
        display: none;
    }
}