/* ============================================================
   NAV — barra superior fija
   ============================================================ */
nav{position:sticky;top:0;z-index:50;background:rgba(10,10,10,.8);backdrop-filter:blur(16px);border-bottom:1px solid var(--color-line-2)}
.nav-in{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:14px var(--space-gutter)}
.nav-chip{font-family:var(--font-mono);font-size:12px;color:var(--color-muted);display:flex;align-items:center;gap:8px}
.nav-chip b{color:var(--color-cyan);font-weight:700}
.nav-cta{font-family:var(--font-heading);font-weight:700;font-size:14px;background:var(--color-cyan);color:var(--color-bg);padding:11px 18px;border-radius:var(--radius-sm);white-space:nowrap;transition:background .15s,transform .15s}
.nav-cta:hover{background:#46e6d4;transform:translateY(-1px)}
@media(max-width:760px){.nav-chip{display:none}}