.site-header {
    position: sticky;
    z-index: 1000;
    top: 0;
    width: 100%;
    transition: box-shadow 0.2s ease;
}

.menu-toggle {
    display: none;
}

.site-header.is-scrolled {
    box-shadow: 0 8px 24px rgba(11, 18, 37, 0.1);
    backdrop-filter: blur(5px);
    background: rgba(236, 236, 236, 0.81);
}

.admin-bar .site-header {
    top: 32px;
}

@media screen and (max-width: 782px) {
    .admin-bar .site-header {
        top: 46px;
    }
}

@media screen and (max-width: 900px) {
    .site-header {
        background: #fff;
    }

    .menu-toggle {
        display: inline-flex;
        flex: 0 0 44px;
        flex-direction: column;
        gap: 5px;
        align-items: center;
        justify-content: center;
        width: 44px;
        height: 44px;
        padding: 0;
        border: 1px solid var(--border);
        border-radius: 9px;
        background: #fff;
        color: var(--text);
        cursor: pointer;
    }

    .menu-toggle:hover,
    .menu-toggle:focus-visible {
        border-color: var(--primary);
        color: var(--primary);
        outline: 3px solid rgba(37, 99, 235, 0.18);
        outline-offset: 2px;
    }

    .menu-toggle span {
        display: block;
        width: 22px;
        height: 2px;
        border-radius: 2px;
        background: currentColor;
        transition: transform 0.2s ease, opacity 0.2s ease;
    }

    .site-header.menu-open .menu-toggle span:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }

    .site-header.menu-open .menu-toggle span:nth-child(2) {
        opacity: 0;
    }

    .site-header.menu-open .menu-toggle span:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }

    .main-navigation {
        position: absolute;
        z-index: 1001;
        top: calc(100% + 1px);
        right: 0;
        width: min(340px, calc(100vw - 40px));
        max-height: 0;
        overflow: hidden;
        visibility: hidden;
        border: 1px solid transparent;
        border-radius: 0 0 12px 12px;
        background: #fff;
        opacity: 0;
        transform: translateY(-8px);
        transition: max-height 0.3s ease, opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
    }

    .site-header.menu-open .main-navigation {
        max-height: calc(100vh - 120px);
        overflow-y: auto;
        visibility: visible;
        border-color: var(--border);
        box-shadow: 0 16px 30px rgba(11, 18, 37, 0.16);
        opacity: 1;
        transform: translateY(0);
    }

    .site-header.menu-open .main-navigation {
        display: block;
        width: 100%;
    }

    .main-navigation ul {
        flex-direction: column;
        gap: 0;
        margin: 0;
        padding: 8px;
    }

    .main-navigation li {
        width: 100%;
        margin: 0;
    }

    .main-navigation a {
        display: block;
        width: 100%;
        padding: 12px 14px;
        border-radius: 7px;
    }

    .main-navigation a:hover,
    .main-navigation a:focus-visible {
        background: var(--light);
        color: var(--primary);
        outline: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .menu-toggle span,
    .main-navigation {
        transition: none;
    }
}