/* ============================================================
   nav.css — Shared top navigation
   ============================================================ */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: 60px;
  display: flex;
  align-items: center;
  padding: 0 40px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-subtle);
  transition:
    background var(--transition-med),
    backdrop-filter var(--transition-med);
}

.site-nav.scrolled {
  background: rgba(8, 11, 16, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

/* Brand */
.nav__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
}

.nav__brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Center links */
.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
}

.nav__links a {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 2px solid transparent;
  transition:
    color var(--transition-fast),
    border-color var(--transition-fast);
}

.nav__links a:hover {
  color: var(--text-primary);
}

.nav__links a.active {
  color: var(--accent-cyan);
  border-bottom-color: var(--accent-cyan);
}

/* Right CTA */
.nav__cta {
  margin-left: auto;
}

/* Hamburger (mobile) */
.nav__hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  margin-left: auto;
  min-height: 44px;
  min-width: 44px;
  align-items: center;
  justify-content: center;
}

.nav__hamburger span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--text-primary);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav__hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav__hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav__hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* Mobile overlay */
.nav__mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--bg-primary);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 40px;
  opacity: 0;
  transition: opacity var(--transition-med);
}

.nav__mobile-overlay.open {
  opacity: 1;
}

.nav__mobile-overlay ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

.nav__mobile-overlay a {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.nav__mobile-overlay a:hover,
.nav__mobile-overlay a.active {
  color: var(--accent-cyan);
}

@media (max-width: 768px) {
  .site-nav {
    padding: 0 20px;
  }

  .nav__links,
  .nav__cta {
    display: none;
  }

  .nav__hamburger {
    display: flex;
  }

  .nav__mobile-overlay {
    display: flex;
  }
}