/* ==========================================================================
   02-nav.css — Sticky top nav: transparent → charcoal-glass on scroll
   ========================================================================== */

.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-24) var(--space-32);
  transition: background-color 300ms ease, backdrop-filter 300ms ease;
}

/* Transparent default — overlays the hero */
.site-nav--transparent {
  background-color: transparent;
  backdrop-filter: none;
}

/* Solid charcoal-glass once scrolled past 80px */
.site-nav--solid {
  background-color: rgba(26, 22, 18, 0.92);
  backdrop-filter: blur(8px);
}

/* Logo / wordmark in nav */
.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  gap: var(--space-8);
  flex-shrink: 0;
}

.nav-logo img {
  height: 44px;
  width: auto;
}

.nav-logo__wordmark {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  font-variation-settings: 'opsz' 24, 'SOFT' 20, 'wght' 500;
  color: var(--color-paper);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.nav-logo__sub {
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-dust);
  display: block;
}

/* Desktop links */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-32);
}

.nav-links a {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-paper);
  text-decoration: none;
  opacity: 0.85;
  transition: opacity var(--transition-fast);
}

.nav-links a:hover {
  opacity: 1;
  color: var(--color-paper);
}

/* CTA in nav */
.nav-cta {
  display: inline-flex;
  align-items: center;
  height: 36px;
  padding: 0 var(--space-16);
  border-radius: var(--radius-pill);
  background-color: var(--color-rust);
  color: var(--color-paper) !important;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.03em;
  text-decoration: none;
  opacity: 1 !important;
  transition: background-color var(--transition-base);
  white-space: nowrap;
}

.nav-cta:hover {
  background-color: var(--color-rust-hover);
  color: var(--color-paper) !important;
}

/* Mobile hamburger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-4);
  width: 44px;
  height: 44px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 6px;
  z-index: 110;
}

.nav-toggle span {
  display: block;
  height: 1.5px;
  background-color: var(--color-paper);
  transition: transform var(--transition-base), opacity var(--transition-base);
  transform-origin: center;
}

/* Hamburger → X transform when open */
.nav-toggle.is-open span:nth-child(1) { transform: translateY(5.5px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-5.5px) rotate(-45deg); }

/* Mobile nav drawer */
.nav-drawer {
  display: none;
  position: fixed;
  inset: 0;
  background-color: var(--color-footer);
  z-index: 99;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-32);
  opacity: 0;
  transition: opacity 250ms ease;
}

.nav-drawer.is-open {
  display: flex;
  opacity: 1;
}

.nav-drawer a {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 400;
  font-variation-settings: 'opsz' 36, 'SOFT' 30, 'wght' 400;
  color: var(--color-paper);
  text-decoration: none;
  letter-spacing: -0.005em;
  line-height: 1.2;
  transition: color var(--transition-fast);
}

.nav-drawer a:hover {
  color: var(--color-rust);
}

.nav-drawer .nav-cta {
  font-family: var(--font-body);
  font-size: 14px;
  height: 48px;
  padding: 0 var(--space-32);
}

/* Responsive breakpoints */
@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
}

@media (max-width: 640px) {
  .site-nav {
    padding: var(--space-16) var(--space-24);
  }
}

/* Focus ring on nav links */
.nav-links a:focus-visible,
.nav-cta:focus-visible {
  outline: 3px solid var(--color-rust);
  outline-offset: 3px;
  border-radius: 2px;
}