/* =========================
   Header (scoped)
   ========================= */

.site-header {
    position: sticky;
    top: 0;
    z-index: 1000;

    background: rgba(15, 17, 21, 0.72);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(10px);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--s-6);
    padding: var(--s-4) 0;
}

/* Brand */
.brand {
    display: inline-flex;
    flex-direction: column;
    line-height: 1.1;
}

.brand-name {
    font-weight: 800;
    letter-spacing: -0.02em;
    color: var(--text);
    font-size: 1.05rem;
}

.brand-sub {
    color: var(--muted-2);
    font-size: 0.85rem;
}

/* Desktop nav */
.site-nav {
    display: flex;
    align-items: center;
    gap: var(--s-6);
}

.site-nav a {
    color: var(--muted);
    font-weight: 600;
    padding: 0.4rem 0;
    border-bottom: 1px solid transparent;
    transition: color 140ms ease, border-color 140ms ease;
}

.site-nav a:hover {
    color: var(--text);
    border-color: rgba(93, 220, 255, 0.55);
}

/* Hamburger button (hidden on desktop) */
.nav-toggle {
    display: none;
    align-items: center;
    justify-content: center;

    width: 44px;
    height: 44px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.03);
    color: var(--text);

    cursor: pointer;
    user-select: none;
}

.nav-toggle:hover {
    border-color: rgba(255, 255, 255, 0.2);
}

/* Mobile layout */
@media (max-width: 900px) {
    .nav-toggle {
        display: inline-flex;
    }

    /* Hide menu by default on mobile */
    .site-nav {
        display: none;

        position: absolute;
        top: 100%;
        left: 0;
        right: 0;

        padding: var(--s-4);
        background: rgba(15, 17, 21, 0.95);
        border-bottom: 1px solid var(--border);
        backdrop-filter: blur(10px);
    }

    /* When open */
    .site-nav.is-open {
        display: flex;
        flex-direction: column;
        align-items: stretch;
        gap: var(--s-3);
    }

    .site-nav a {
        padding: 0.85rem 0.9rem;
        border: 1px solid var(--border);
        border-radius: 12px;
        background: rgba(255, 255, 255, 0.03);
    }

    .site-nav a:hover {
        border-color: rgba(93, 220, 255, 0.45);
    }
}