/* ============================================
   NAVIGATION
   Default: transparent over hero.
   Scrolled / inner-page: solid .nav-solid variant.
   ============================================ */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition:
    background var(--duration-base) ease,
    border-color var(--duration-base) ease,
    backdrop-filter var(--duration-base) ease;
}

.site-nav.nav-solid {
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom-color: var(--color-champagne-soft);
}

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

/* ============================================
   Logo
   ============================================ */
.logo {
  display: inline-flex;
  align-items: baseline;
  gap: 4px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-num {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.04em;
  line-height: 1;
}

.logo-text {
  font-family: var(--font-sans);
  font-size: 10px;
  font-weight: 500;
  color: var(--color-champagne);
  letter-spacing: 0.4em;
  text-transform: uppercase;
  align-self: center;
  margin-top: 6px;
}

/* ============================================
   Desktop menu
   ============================================ */
.nav-menu {
  display: flex;
  gap: 28px;
  align-items: center;
}

.nav-menu a {
  position: relative;
  font-size: var(--fs-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: color var(--duration-fast) ease;
  padding: 4px 0;
}

.nav-menu a:hover,
.nav-menu a:focus-visible {
  color: var(--color-text-primary);
}

.nav-menu a::after {
  content: '';
  position: absolute;
  bottom: -6px;
  left: 50%;
  width: 0;
  height: 1px;
  background: var(--color-champagne);
  transition: width var(--duration-base) ease;
  transform: translateX(-50%);
}

.nav-menu a:hover::after,
.nav-menu a:focus-visible::after {
  width: 100%;
}

/* ============================================
   CTA button
   ============================================ */
.nav-cta {
  padding: 8px 18px;
  border: 1px solid var(--color-champagne);
  color: var(--color-champagne);
  font-size: var(--fs-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  font-weight: 500;
  transition:
    background var(--duration-base) ease,
    color var(--duration-base) ease;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.nav-cta:hover,
.nav-cta:focus-visible {
  background: var(--color-champagne);
  color: var(--color-bg-deep);
}

/* ============================================
   Hamburger
   ============================================ */
.nav-hamburger {
  display: none;
  position: relative;
  width: 32px;
  height: 24px;
  background: transparent;
  border: none;
  padding: 0;
  cursor: pointer;
}

.nav-hamburger span {
  display: block;
  position: absolute;
  left: 0;
  height: 2px;
  width: 100%;
  background: var(--color-text-primary);
  border-radius: 1px;
  transition:
    top var(--duration-base) ease,
    bottom var(--duration-base) ease,
    transform var(--duration-base) ease,
    opacity var(--duration-base) ease;
}

.nav-hamburger span:nth-child(1) { top: 0; }
.nav-hamburger span:nth-child(2) { top: 50%; transform: translateY(-50%); }
.nav-hamburger span:nth-child(3) { bottom: 0; }

.nav-hamburger.is-open span:nth-child(1) {
  top: 50%;
  transform: translateY(-50%) rotate(45deg);
}
.nav-hamburger.is-open span:nth-child(2) {
  opacity: 0;
}
.nav-hamburger.is-open span:nth-child(3) {
  bottom: 50%;
  transform: translateY(50%) rotate(-45deg);
}

/* ============================================
   Mobile menu overlay
   ============================================ */
.mobile-menu {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  padding: var(--space-2xl) var(--space-xl);
  z-index: 99;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--duration-base) ease;
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  overflow-y: auto;
}

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

.mobile-menu nav {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.mobile-menu a {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-primary);
  padding: var(--space-sm) 0;
  border-bottom: 1px solid var(--color-divider);
  transition: color var(--duration-fast) ease;
}

.mobile-menu a:hover,
.mobile-menu a:focus-visible {
  color: var(--color-champagne);
}

.mobile-menu .mobile-cta {
  margin-top: var(--space-lg);
  color: var(--color-champagne);
  border-bottom-color: var(--color-champagne);
}

/* ============================================
   Responsive — <768px
   ============================================ */
@media (max-width: 767px) {
  .nav-container {
    padding: 0 var(--space-lg);
  }

  .nav-menu,
  .nav-cta {
    display: none;
  }

  .nav-hamburger {
    display: block;
  }
}

/* ≥768px: mobile menu is never shown even if JS leaves hidden off */
@media (min-width: 768px) {
  .mobile-menu {
    display: none;
  }
}