/* ============================================================
   nav.css — Sticky navigation, hamburger, mobile overlay
   ============================================================ */

#nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  transition: background var(--transition), backdrop-filter var(--transition), box-shadow var(--transition);
}

#nav.scrolled {
  background: rgba(8, 8, 16, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--dark-border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-h);
}

/* ---- Logo ---- */
.nav-logo {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-light);
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-logo .logo-dot {
  display: inline-block;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px var(--accent);
  animation: pulse-dot 2.5s ease-in-out infinite;
  flex-shrink: 0;
}

/* ---- Desktop links ---- */
.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-faint);
  transition: color var(--transition);
  position: relative;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px; left: 0;
  width: 0; height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transition: width var(--transition);
}

.nav-links a:hover,
.nav-links a.active { color: var(--text-light); }

.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

/* ---- Hamburger button ---- */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
  z-index: 1100;
  background: none;
  border: none;
}

.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-light);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---- Mobile overlay menu ---- */
.mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(8, 8, 16, 0.97);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 40px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}

.mobile-menu a {
  font-size: 2rem;
  font-weight: 700;
  color: var(--text-light);
  letter-spacing: -0.03em;
  transition: color 0.2s;
}

.mobile-menu a:hover { color: var(--accent); }