/* ============================================================
   nav.css — Navigation & hamburger mobile
   ============================================================ */

/* ── Base nav ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: background var(--dur-base) var(--ease-out),
              box-shadow var(--dur-base) var(--ease-out);
}

.nav--scrolled {
  background: rgba(7, 7, 9, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--color-gold-30);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 var(--space-8);
  max-width: var(--container-wide);
  margin-inline: auto;
}

/* ── Logo ── */
.nav__logo {
  display: flex;
  flex-direction: column;
  gap: 1px;
  text-decoration: none;
  flex-shrink: 0;
}

.nav__logo-name {
  font-family: var(--font-serif);
  font-style: italic;
  font-weight: 300;
  font-size: 1.25rem;
  color: var(--color-smoke);
  letter-spacing: 0.04em;
  line-height: 1.1;
  transition: color var(--dur-fast) var(--ease-out);
}

.nav__logo:hover .nav__logo-name {
  color: var(--color-gold-pale);
}

.nav__logo-chinese {
  font-family: var(--font-chinese);
  font-size: 0.6rem;
  color: var(--color-gold);
  letter-spacing: 0.3em;
  line-height: 1;
}

/* ── Links ── */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav__link {
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(245, 240, 232, 0.7);
  text-decoration: none;
  position: relative;
  padding-bottom: 3px;
  transition: color var(--dur-fast) var(--ease-out);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-gold);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--dur-base) var(--ease-out);
}

.nav__link:hover {
  color: var(--color-smoke);
}

.nav__link:hover::after,
.nav__link--active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav__link--active {
  color: var(--color-gold-pale);
}

/* ── Actions ── */
.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav__cta {
  font-size: var(--text-xs);
  padding: var(--space-2) var(--space-6);
}

/* ── Language selector ── */
.nav__lang {
  position: relative;
}

.nav__lang-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.1em;
  color: rgba(245, 240, 232, 0.6);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
  transition: color var(--dur-fast) var(--ease-out);
}

.nav__lang-btn:hover {
  color: var(--color-gold-pale);
}

.nav__lang-arrow {
  transition: transform var(--dur-fast) var(--ease-out);
}

.nav__lang-btn[aria-expanded="true"] .nav__lang-arrow {
  transform: rotate(180deg);
}

.nav__lang-dropdown {
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  background: rgba(15, 15, 20, 0.95);
  backdrop-filter: blur(20px);
  border: var(--border-gold);
  border-radius: 4px;
  min-width: 120px;
  overflow: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
  list-style: none;
}

.nav__lang-dropdown--open {
  opacity: 1;
  pointer-events: all;
  transform: none;
}

.nav__lang-option {
  display: block;
  width: 100%;
  text-align: left;
  padding: var(--space-3) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: rgba(245, 240, 232, 0.7);
  background: none;
  border: none;
  cursor: pointer;
  transition: background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}

.nav__lang-option:hover {
  background: var(--color-gold-10);
  color: var(--color-gold-pale);
}

/* ── Hamburger ── */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav__hamburger-line {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-smoke);
  border-radius: 1px;
  transform-origin: center;
  transition: transform var(--dur-base) var(--ease-out),
              opacity var(--dur-base) var(--ease-out);
}

.nav__hamburger--open .nav__hamburger-line:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav__hamburger--open .nav__hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav__hamburger--open .nav__hamburger-line:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* ── Mobile menu ── */
.nav__mobile {
  position: fixed;
  inset: 0;
  z-index: 999;
  background: var(--color-void);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-8);
  opacity: 0;
  pointer-events: none;
  transform: translateX(100%);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}

/* Lattice overlay on mobile menu */
.nav__mobile::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url('../assets/svg/lattice.svg');
  background-size: 80px 80px;
  opacity: 0.03;
  pointer-events: none;
}

.nav__mobile--open {
  opacity: 1;
  pointer-events: all;
  transform: none;
}

.nav__mobile-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
  text-align: center;
}

.nav__mobile-link {
  font-family: var(--font-serif);
  font-style: italic;
  font-size: clamp(2rem, 8vw, 3.5rem);
  font-weight: 300;
  color: rgba(245, 240, 232, 0.6);
  text-decoration: none;
  transition: color var(--dur-base) var(--ease-out);
  line-height: 1.1;
}

.nav__mobile-link:hover {
  color: var(--color-gold-pale);
}

.nav__mobile-footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

.nav__mobile-lang {
  display: flex;
  gap: var(--space-3);
}

.nav__mobile-lang .nav__lang-option {
  font-size: 1.25rem;
  padding: var(--space-2);
  border-radius: 4px;
}

/* Body lock when mobile menu open */
.body--menu-open {
  overflow: hidden;
}

/* ── Footer language buttons ── */
.footer__bottom-lang {
  display: flex;
  gap: var(--space-2);
}

.footer__lang-btn {
  font-size: var(--text-xs);
  padding: var(--space-1) var(--space-2);
  color: rgba(245, 240, 232, 0.4);
  transition: color var(--dur-fast) var(--ease-out);
  border-radius: 2px;
}

.footer__lang-btn:hover,
.footer__lang-btn--active {
  color: var(--color-gold-pale);
}

/* ── Responsive ── */
@media (max-width: 1023px) {
  .nav__links { display: none; }
  .nav__cta   { display: none; }
  .nav__hamburger { display: flex; }
}

@media (max-width: 767px) {
  .nav__inner {
    padding: 0 var(--space-4);
  }
}