/* ── Site Header ───────────────────────────────────────── */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 17, 23, .92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 var(--gap);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

/* ── Brand / Logo ─────────────────────────────────────── */
.site-brand a,
.site-title {
    font-size: 22px;
    font-weight: 700;
    color: var(--color-white);
    letter-spacing: -.3px;
}
.site-brand img {
    height: 36px;
    width: auto;
}

/* ── Nav ──────────────────────────────────────────────── */
.nav-list {
    list-style: none;
    display: flex;
    gap: 32px;
}

.nav-list li a {
    color: var(--color-text-muted);
    font-size: 15px;
    font-weight: 500;
    transition: color .2s;
    position: relative;
}
.nav-list li a:hover,
.nav-list li.current-menu-item a {
    color: var(--color-white);
}
.nav-list li.current-menu-item a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--color-primary);
    border-radius: 1px;
}

/* ── Mobile Toggle ────────────────────────────────────── */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: .2s;
}

/* ── Responsive ───────────────────────────────────────── */
@media (max-width: 768px) {
    .menu-toggle { display: flex; }

    .main-nav {
        display: none;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
        padding: 16px var(--gap);
    }
    .main-nav.is-open { display: block; }

    .nav-list {
        flex-direction: column;
        gap: 12px;
    }
}