/* ============================================================================
   GARAGE GALS . NAVIGATION
   ----------------------------------------------------------------------------
   Fixed top bar: transparent over the hero, solidifies on scroll (JS toggles
   .is-scrolled), hides on scroll-down and reveals on scroll-up. Full-screen
   mobile menu. Signature red shimmer rail along the bottom edge.
   ============================================================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-nav);
  transition:
    transform var(--dur-4) var(--ease-out-expo),
    background-color var(--dur-3) var(--ease-standard),
    backdrop-filter var(--dur-3) var(--ease-standard),
    box-shadow var(--dur-3) var(--ease-standard);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
  max-width: var(--container);
  margin-inline: auto;
  padding: clamp(0.85rem, 0.5rem + 1vw, 1.35rem) var(--gutter);
}

/* Solidified state on scroll */
.nav.is-scrolled {
  background: color-mix(in srgb, var(--cream-150) 82%, transparent);
  -webkit-backdrop-filter: blur(var(--blur-md)) saturate(1.4);
  backdrop-filter: blur(var(--blur-md)) saturate(1.4);
  box-shadow: 0 1px 0 var(--rule), var(--shadow-2);
}
[data-theme="dark"] .nav.is-scrolled,
.nav.is-scrolled.on-dark {
  background: color-mix(in srgb, var(--ink-900) 78%, transparent);
}

/* Hide on scroll-down, reveal on scroll-up */
.nav.is-hidden { transform: translateY(-100%); }

/* Red shimmer rail along the bottom edge */
.nav::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: linear-gradient(90deg,
    transparent 0%, rgba(139,0,0,0.35) 8%, var(--red-600) 22%,
    var(--red-500) 38%, var(--red-300) 50%, var(--red-500) 62%,
    var(--red-600) 78%, rgba(139,0,0,0.35) 92%, transparent 100%);
  background-size: 200% 100%;
  opacity: 0;
  transition: opacity var(--dur-3) var(--ease-standard);
  animation: rail-shimmer 6s linear infinite;
}
.nav.is-scrolled::after { opacity: 1; }

/* ---- Brand lockup -------------------------------------------------------- */
.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  flex-shrink: 0;
}
.nav__wordmark {
  font-family: var(--font-display);
  font-weight: var(--weight-bold);
  font-size: 1.4rem;
  letter-spacing: var(--tracking-tight);
  color: var(--fg-strong);
  background: var(--grad-red-flare);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.nav__gg {
  width: 2rem;
  height: 2rem;
  object-fit: contain;
  filter: drop-shadow(0 2px 6px rgba(230,58,45,0.4));
}

/* ---- Primary links ------------------------------------------------------- */
.nav__links {
  display: flex;
  align-items: center;
  gap: clamp(1.25rem, 0.5rem + 1.5vw, 2.5rem);
}
.nav__link {
  position: relative;
  font-weight: var(--weight-medium);
  font-size: var(--fs-small);
  color: var(--fg);
  padding-block: 0.4rem;
  transition: color var(--dur-2) var(--ease-standard);
}
.nav__link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 100%; height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-3) var(--ease-out-expo);
}
.nav__link:hover { color: var(--accent); }
.nav__link:hover::after,
.nav__link[aria-current="page"]::after { transform: scaleX(1); }
.nav__link[aria-current="page"] { color: var(--accent); }

/* Over the dark hero (not yet scrolled): light links + light hamburger */
.nav.on-dark:not(.is-scrolled) .nav__link { color: rgba(245, 239, 228, 0.82); }
.nav.on-dark:not(.is-scrolled) .nav__link:hover { color: var(--cream-50); }
.nav.on-dark:not(.is-scrolled) .nav__toggle-bar { background: var(--cream-50); }

.nav__cta { flex-shrink: 0; }

/* ---- Mobile toggle (hamburger to X) -------------------------------------- */
.nav__toggle {
  display: none;
  width: 2.75rem; height: 2.75rem;
  align-items: center;
  justify-content: center;
  border-radius: var(--r-sm);
  z-index: calc(var(--z-overlay) + 1);
}
.nav__toggle-box { position: relative; width: 1.5rem; height: 1rem; }
.nav__toggle-bar {
  position: absolute;
  left: 0;
  width: 100%;
  height: 2.5px;
  border-radius: 2px;
  background: var(--fg-strong);
  transition: transform var(--dur-3) var(--ease-out-expo), opacity var(--dur-2) var(--ease-standard), background var(--dur-2);
}
.nav__toggle-bar:nth-child(1) { top: 0; }
.nav__toggle-bar:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav__toggle-bar:nth-child(3) { bottom: 0; }

body.menu-open .nav__toggle-bar:nth-child(1) { transform: translateY(0.43rem) rotate(45deg); }
body.menu-open .nav__toggle-bar:nth-child(2) { opacity: 0; transform: translateX(-40%); }
body.menu-open .nav__toggle-bar:nth-child(3) { transform: translateY(-0.43rem) rotate(-45deg); }

/* ---- Full-screen mobile menu --------------------------------------------- */
.nav__menu {
  position: fixed;
  inset: 0;
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-3xl) var(--gutter) var(--space-2xl);
  background: var(--ink-900);
  background-image: var(--grad-ink-depth);
  clip-path: circle(0% at calc(100% - 3rem) 3rem);
  transition: clip-path var(--dur-6) var(--ease-garage-door);
  pointer-events: none;
}
body.menu-open .nav__menu {
  clip-path: circle(150% at calc(100% - 3rem) 3rem);
  pointer-events: auto;
}
.nav__menu-list {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}
.nav__menu-link {
  font-family: var(--font-display);
  font-size: clamp(2rem, 1.3rem + 4vw, 3.5rem);
  font-weight: var(--weight-semi);
  letter-spacing: var(--tracking-tight);
  color: var(--cream-50);
  line-height: 1.18;
  opacity: 0;
  transform: translateY(1.5rem);
  transition: opacity var(--dur-4) var(--ease-out-expo), transform var(--dur-4) var(--ease-out-expo), color var(--dur-2);
}
.nav__menu-link:hover { color: var(--red-400); }
.nav__menu-link .idx {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--red-400);
  margin-right: 0.8rem;
  letter-spacing: var(--tracking-wide);
  vertical-align: middle;
}
body.menu-open .nav__menu-link {
  opacity: 1;
  transform: translateY(0);
  transition-delay: calc(0.18s + var(--i, 0) * 0.06s);
}
.nav__menu-foot {
  margin-top: var(--space-2xl);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  align-items: center;
  color: var(--cream-200);
}
.nav__menu-foot a { color: var(--cream-50); font-weight: var(--weight-semi); }

/* ---- Responsive switch --------------------------------------------------- */
@media (max-width: 860px) {
  .nav__links { display: none; }
  .nav__cta { display: none; }
  .nav__toggle { display: inline-flex; }
}
@media (min-width: 861px) {
  .nav__menu { display: none; }
}