/* ============================================================
   SECTION NAV — Barra de Navegação Sticky com Branding
   ============================================================
   Navegação fixa no topo com marca, subtítulo e links.
   Fundo emerald-abyss, texto claro.
   ============================================================ */

/* ========== NAV CONTAINER ========== */

.section-nav {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background: var(--emerald-abyss);
    box-shadow: var(--shadow-md);
}

/* ========== INNER WRAPPER ========== */

.section-nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: var(--container-xl);
    margin: 0 auto;
    padding: var(--space-3) var(--space-6);
}

/* ========== BRAND ========== */

.section-nav-brand {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: var(--weight-bold);
    color: var(--mint-signal);
    text-decoration: none;
    line-height: var(--leading-tight);
}

.section-nav-brand-subtitle {
    display: block;
    font-family: var(--font-sans);
    font-size: var(--text-xs);
    font-weight: var(--weight-regular);
    color: rgba(255, 255, 255, 0.5);
    margin-top: var(--space-0.5);
}

/* ========== NAV LINKS ========== */

.section-nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.section-nav-link {
    font-family: var(--font-sans);
    font-size: var(--text-sm);
    font-weight: var(--weight-medium);
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: color 0.15s ease, background 0.15s ease;
}

.section-nav-link:hover {
    color: rgba(255, 255, 255, 1);
}

.section-nav-link.active {
    color: var(--mint-signal);
    background: rgba(255, 255, 255, 0.08);
}