/* ========== TOP NAV ========== */
.nav{
  position:fixed;top:0;left:0;right:0;
  z-index:900; /* must be above sections (z:5) and transition cover (z:300) */
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 36px;
  font-family:'JetBrains Mono',monospace;font-size:11px;
  letter-spacing:.18em;text-transform:uppercase;
  color:#fff;

  /* solid background so it never bleeds into section content */
  background:rgba(0,0,0,.75);
  backdrop-filter:blur(18px) saturate(140%);
  -webkit-backdrop-filter:blur(18px) saturate(140%);
  border-bottom:1px solid rgba(255,255,255,.07);
  transition:background .4s, border-color .4s;
}
/* darker on scroll (JS adds .scrolled if needed, but solid bg handles it) */
.nav.scrolled{
  background:rgba(0,0,0,.92);
  border-bottom-color:rgba(255,255,255,.12);
}

.nav .brand{display:flex;align-items:center;gap:10px}
.nav .brand .dot{
  width:8px;height:8px;background:var(--accent);border-radius:50%;
  box-shadow:0 0 16px var(--accent);
  animation:pulse 1.6s infinite;
}
.nav ul{display:flex;gap:28px;list-style:none}
.nav ul a{position:relative;padding:4px 0;color:#bbb;transition:color .3s}
.nav ul a:hover{color:#fff}
.nav ul a::after{
  content:"";position:absolute;left:0;right:0;bottom:-3px;
  height:1px;background:var(--accent);
  transform:scaleX(0);transform-origin:left;
  transition:transform .4s cubic-bezier(.7,0,.2,1);
}
.nav ul a:hover::after{transform:scaleX(1)}

.nav .meta{display:flex;gap:20px;align-items:center;color:#888}
.nav .meta .pulse{
  display:inline-block;width:6px;height:6px;
  background:var(--accent);border-radius:50%;
  margin-right:6px;animation:pulse 1.6s infinite;
}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.2}}

@media(max-width:1024px){ .nav ul{display:none} }
@media(max-width:768px){
  .nav{padding:14px 20px}
  .nav .meta{display:none}
}