/* ==========================================================================
   Nav Component
   Sticky header with logo, desktop links, and mobile hamburger overlay.
   ========================================================================== */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  height: var(--nav-height);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--nav-height);
}

/* --- Logo --- */
.nav__logo { display: flex; align-items: center; gap: 0.5rem; }
.nav__logo:hover { text-decoration: none; }
.nav__logo-img { height: 2rem; width: auto; }

.nav__logo-text {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--color-text);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  line-height: 1;
}

/* --- Desktop links --- */
.nav__links {
  display: none;
  gap: var(--space-lg);
}

.nav__link {
  font-family: var(--font-heading);
  font-size: var(--font-size-lg);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-text);
  position: relative;
  text-decoration: none;
  padding-block: 0.5rem;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 3px;
  background-color: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.nav__link:hover { text-decoration: none; }
.nav__link:hover::after,
.nav__link[aria-current="page"]::after { transform: scaleX(1); }

.nav__link[aria-current="page"] {
  color: var(--color-accent);
}

/* --- Hamburger --- */
.nav__burger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 2.75rem;
  height: 2.75rem;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.375rem;
}

.nav__burger-line {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text);
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

/* Burger to X animation */
.nav__burger[aria-expanded="true"] .nav__burger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.nav__burger[aria-expanded="true"] .nav__burger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* --- Mobile overlay --- */
.nav__overlay {
  position: fixed;
  inset: 0;
  z-index: 99;
  background-color: rgba(10, 10, 10, 0.98);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.nav__overlay.is-active {
  opacity: 1;
  visibility: visible;
}

.nav__overlay-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}

.nav__overlay-link {
  font-family: var(--font-heading);
  font-size: var(--font-size-3xl);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text);
  text-decoration: none;
  transition: color var(--transition-fast);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.nav__overlay-link:hover,
.nav__overlay-link[aria-current="page"] {
  color: var(--color-accent);
  text-decoration: none;
}

/* --- Desktop breakpoint --- */
@media (min-width: 1024px) {
  .nav__links { display: flex; }
  .nav__burger { display: none; }
}