/* ============================================================
   NIGHTFALL EXPRESS — NAVIGATION
   ============================================================ */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background var(--transition-mid), box-shadow var(--transition-mid), border-color var(--transition-mid);
  border-bottom: 1px solid transparent;
}

.site-nav.scrolled {
  background: rgba(13, 15, 20, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom-color: var(--border);
  box-shadow: 0 4px 32px rgba(0,0,0,0.5);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}

/* ── Logo ───────────────────────────────────────────────────── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo-img {
  width: 44px;
  height: 44px;
  filter: drop-shadow(0 0 8px rgba(168, 192, 220, 0.2));
  transition: filter var(--transition-mid);
}

.nav-logo:hover .nav-logo-img {
  filter: drop-shadow(0 0 14px rgba(168, 192, 220, 0.4));
}

.nav-logo-text {
  display: flex;
  flex-direction: column;
  line-height: 1;
}

.nav-logo-name {
  font-family: var(--font-heading);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-primary);
}

.nav-logo-sub {
  font-family: var(--font-heading);
  font-size: 0.6rem;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--frost);
  margin-top: 2px;
}

/* ── Links ──────────────────────────────────────────────────── */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  list-style: none;
}

.nav-links a {
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-secondary);
  padding: 0.45rem 0.75rem;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  position: relative;
  text-decoration: none;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 1px;
  background: var(--frost);
  transition: width var(--transition-mid);
}

.nav-links a:hover {
  color: var(--text-primary);
  background: rgba(168, 192, 220, 0.06);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: calc(100% - 1.5rem);
}

.nav-links a.active {
  color: var(--pumpkin);
}

.nav-links a::after {
  background: var(--pumpkin-deep);
}

/* ── Apply CTA ──────────────────────────────────────────────── */
.nav-cta {
  margin-left: var(--space-md);
}

/* ── Hamburger ──────────────────────────────────────────────── */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 8px 10px;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.nav-toggle:hover { border-color: var(--border-hover); }

.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--silver);
  border-radius: 2px;
  transition: transform var(--transition-mid), opacity var(--transition-mid), width var(--transition-mid);
  transform-origin: center;
}

.nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; width: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ── Mobile menu ────────────────────────────────────────────── */
@media (max-width: 820px) {
  .nav-toggle { display: flex; }

  .nav-links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(13, 15, 20, 0.97);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: var(--space-md) var(--space-lg);
    transform: translateY(-110%);
    transition: transform var(--transition-mid);
    pointer-events: none;
  }

  .nav-links.open {
    transform: translateY(0);
    pointer-events: auto;
  }

  .nav-links li { width: 100%; }

  .nav-links a {
    display: block;
    padding: 0.85rem var(--space-md);
    border-bottom: 1px solid var(--border);
    font-size: 0.85rem;
    border-radius: 0;
  }

  .nav-links a::after { display: none; }

  .nav-links li:last-child a { border-bottom: none; }

  .nav-cta {
    margin: var(--space-md) 0 0;
    width: 100%;
    display: block;
  }

  .nav-cta .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 600px) {
  .nav-inner { padding: 0 var(--space-md); }
  .nav-logo-text { display: none; }
}