.site-header {
    position: sticky;
    z-index: 50;
    top: 0;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-header-overlay);
    backdrop-filter: blur(16px);
}

.nav-shell {
    display: flex;
    align-items: center;
    gap: 12px;
    width: min(calc(100% - 40px), var(--content-width));
    min-height: 72px;
    margin-inline: auto;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 0;
    flex: 0 0 auto;
    color: var(--color-ink);
    font-size: 1.16rem;
    font-weight: 850;
    letter-spacing: -0.02em;
    text-decoration: none;
}

.brand-highlight {
    display: inline-block;
    margin-left: 3px;
    padding: 5px 8px;
    border-radius: 9px;
    background: var(--color-primary);
    color: var(--color-on-primary);
    box-shadow: var(--shadow-brand);
}

.nav-links {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 6px;
    margin-left: 0;
}

.nav-links a,
.user-info {
    padding: 9px 11px;
    border-radius: 9px;
    color: var(--color-nav-text);
    font-size: 0.92rem;
    font-weight: 700;
    text-decoration: none;
}

.nav-links a:hover {
    background: var(--color-surface-soft);
    color: var(--color-primary-dark);
}

.nav-links .nav-cta {
    padding-inline: 15px;
    background: var(--color-primary);
    color: var(--color-on-primary);
}

.nav-links .nav-cta:hover {
    background: var(--color-primary-dark);
    color: var(--color-on-primary);
}

.user-info {
    color: var(--color-muted);
    font-weight: 600;
}

.nav-logout {
    color: var(--color-danger) !important;
}

.nav-controls {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 0 0 auto;
    margin-left: auto;
}

.nav-icon-button {
    display: inline-grid;
    width: 44px;
    height: 44px;
    padding: 0;
    place-items: center;
    border: 1px solid var(--color-border);
    border-radius: 12px;
    background: var(--color-surface);
    color: var(--color-ink);
    cursor: pointer;
    transition: background var(--transition), border-color var(--transition), color var(--transition);
}

.nav-icon-button:hover {
    border-color: var(--color-border-accent);
    background: var(--color-primary-soft);
    color: var(--color-primary-dark);
}

.theme-toggle-icon {
    font-size: 1.25rem;
    line-height: 1;
}

.theme-toggle {
    display: none;
}

.theme-enabled .theme-toggle {
    display: inline-grid;
}

.nav-toggle {
    display: none;
}

.nav-toggle-icon,
.nav-toggle-icon::before,
.nav-toggle-icon::after {
    display: block;
    width: 20px;
    height: 2px;
    border-radius: 999px;
    background: currentColor;
    transition: transform var(--transition), opacity var(--transition);
}

.nav-toggle-icon {
    position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
    position: absolute;
    left: 0;
    content: '';
}

.nav-toggle-icon::before {
    top: -6px;
}

.nav-toggle-icon::after {
    top: 6px;
}

.nav-toggle[aria-expanded='true'] .nav-toggle-icon {
    background: transparent;
}

.nav-toggle[aria-expanded='true'] .nav-toggle-icon::before {
    transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded='true'] .nav-toggle-icon::after {
    transform: translateY(-6px) rotate(-45deg);
}

.brand-footer .brand-highlight {
    box-shadow: none;
}

@media (max-width: 1024px) {
    .nav-shell {
        display: grid;
        grid-template-columns: minmax(0, 1fr) auto;
        gap: 10px 12px;
        width: min(calc(100% - 28px), var(--content-width));
        min-height: 68px;
        padding-block: 10px;
    }

    .nav-controls {
        grid-column: 2;
        grid-row: 1;
        margin-left: 0;
    }

    .nav-enhanced .nav-toggle {
        display: inline-grid;
    }

    .nav-links {
        grid-column: 1 / -1;
        grid-row: 2;
        display: grid;
        justify-content: stretch;
        gap: 3px;
        width: 100%;
        max-height: calc(100vh - 96px);
        margin: 0;
        padding: 8px;
        overflow-y: auto;
        border: 1px solid var(--color-border);
        border-radius: 14px;
        background: var(--color-surface);
        box-shadow: var(--shadow-md);
    }

    .nav-enhanced .nav-links:not(.is-open) {
        display: none;
    }

    .nav-links a,
    .user-info {
        min-height: 44px;
        padding: 11px 13px;
    }

    .nav-links a {
        display: flex;
        align-items: center;
        text-align: left;
    }

    .nav-links .nav-cta {
        justify-content: center;
        margin-top: 3px;
    }

    .user-info {
        display: flex;
        align-items: center;
        border-bottom: 1px solid var(--color-border);
        border-radius: 0;
    }

    .nav-logout {
        margin-top: 3px;
        border-top: 1px solid var(--color-border);
    }
}