.site-header {
    position: fixed;
    z-index: 1000;
    top: 18px;
    right: 0;
    left: 0;
}

.navbar {
    min-height: 66px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: rgba(4, 9, 18, 0.76);
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
    backdrop-filter: blur(20px);
}

.navbar-brand {
    display: inline-flex;
    align-items: center;
    gap: 11px;
}

.brand-mark {
    width: 42px;
    height: 42px;
    display: grid;
    place-items: center;
    border: 1px solid var(--border-bright);
    border-radius: 12px;
    background: linear-gradient(145deg, #0f766e, #1d4ed8);
    box-shadow: 0 10px 28px rgba(37, 99, 235, 0.3);
}

.brand-shield {
    color: white;
    font-size: 1.15rem;
    font-weight: 900;
}

.brand-copy {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.brand-copy strong {
    font-family: var(--font-display);
    font-size: 0.94rem;
}

.brand-copy small {
    color: var(--text-soft);
    font-size: 0.67rem;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.navbar-menu > a:not(.button) {
    padding: 9px 11px;
    border-radius: 9px;
    color: var(--text-secondary);
    font-size: 0.84rem;
    transition:
        color 180ms ease,
        background 180ms ease;
}

.navbar-menu > a:not(.button):hover {
    background: rgba(255, 255, 255, 0.045);
    color: white;
}

.menu-toggle {
    display: none;
    width: 42px;
    height: 42px;
    padding: 10px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.04);
    cursor: pointer;
}

.menu-toggle span {
    display: block;
    height: 2px;
    margin: 4px 0;
    border-radius: 999px;
    background: white;
}

@media (max-width: 850px) {
    .menu-toggle {
        display: block;
    }

    .navbar-menu {
        display: none;
        position: absolute;
        top: calc(100% + 10px);
        right: var(--container-padding);
        left: var(--container-padding);
        align-items: stretch;
        flex-direction: column;
        padding: 18px;
        border: 1px solid var(--border);
        border-radius: 16px;
        background: rgba(4, 9, 18, 0.96);
        box-shadow: 0 25px 70px rgba(0, 0, 0, 0.35);
    }

    .navbar-menu.is-open {
        display: flex;
    }
}

/* =======================================================
   PREMIUM NAVBAR POLISH
======================================================= */

.navbar {
    transition:
        background 220ms ease,
        border-color 220ms ease,
        box-shadow 220ms ease,
        transform 220ms ease;
}

.site-header.is-scrolled .navbar {
    border-color: rgba(94, 234, 212, 0.2);
    background: rgba(4, 9, 18, 0.9);
    box-shadow:
        0 18px 55px rgba(0, 0, 0, 0.38),
        0 0 35px rgba(37, 99, 235, 0.06);
}

.navbar-menu > a:not(.button) {
    position: relative;
}

.navbar-menu > a:not(.button)::after {
    content: "";
    position: absolute;
    right: 11px;
    bottom: 5px;
    left: 11px;
    height: 1px;
    transform: scaleX(0);
    transform-origin: center;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    transition: transform 180ms ease;
}

.navbar-menu > a:not(.button):hover::after {
    transform: scaleX(1);
}

@media (max-width: 850px) {
    .navbar-menu {
        transform-origin: top;
        animation: navbarMenuIn 180ms ease both;
    }
}

@keyframes navbarMenuIn {
    from {
        opacity: 0;
        transform: translateY(-8px) scale(0.98);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}