.site-header {
    position: fixed;
    top: 0;
    right: 0;
    left: 0;
    z-index: 1000;
    padding: 20px 24px 0;
    pointer-events: none;
}

.nav-shell {
    width: min(100%, 1120px);
    min-height: 66px;
    margin-inline: auto;
    padding: 8px 10px 8px 26px;
    display: flex;
    align-items: center;
    gap: 1rem;
    border-radius: var(--radius-control);
    pointer-events: auto;
    transition: background-color 220ms ease, box-shadow 220ms ease;
}

.site-header.is-scrolled .nav-shell {
    background: var(--glass-fill-strong);
    box-shadow: 0 15px 46px rgba(28, 45, 74, 0.15), inset 0 1px 0 #ffffff;
}

.brand {
    flex: 0 0 auto;
    font-size: 1.45rem;
    font-weight: 760;
    letter-spacing: -0.055em;
}

.brand span {
    color: var(--color-accent);
}

.primary-nav {
    margin-left: auto;
    display: flex;
    align-items: center;
    gap: clamp(1.1rem, 2.2vw, 2rem);
}

.nav-link {
    position: relative;
    padding: 0.72rem 0;
    color: #34343a;
    font-size: 0.84rem;
    font-weight: 590;
    letter-spacing: -0.01em;
}

.nav-link::after {
    content: "";
    position: absolute;
    right: 0;
    bottom: 5px;
    left: 0;
    height: 2px;
    border-radius: 2px;
    background: var(--color-accent);
    transform: scaleX(0);
    transition: transform 200ms var(--ease);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
}

.nav-link.active::after {
    transform: scaleX(1);
}

.nav-action {
    min-height: 48px !important;
    margin-left: 0.8rem;
    padding-inline: 1.22rem !important;
    font-size: 0.84rem !important;
}

.menu-button {
    position: relative;
    width: 48px;
    height: 48px;
    padding: 0;
    display: none;
    flex: 0 0 auto;
    border-radius: 50%;
    cursor: pointer;
}

.menu-button span {
    position: absolute;
    left: 15px;
    width: 18px;
    height: 1.6px;
    border-radius: 2px;
    background: var(--color-text);
    transition: transform 220ms ease;
}

.menu-button span:first-child { transform: translateY(-3px); }
.menu-button span:last-child { transform: translateY(3px); }
.menu-button[aria-expanded="true"] span:first-child { transform: rotate(45deg); }
.menu-button[aria-expanded="true"] span:last-child { transform: rotate(-45deg); }