/* ============================================
   Navigation — Scroll-Aware HUD Bar
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(18, 19, 23, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: all 0.3s ease;
  animation: flicker 3s ease-in-out;
}

.nav.scrolled {
  background: rgba(12, 14, 17, 0.95);
  border-bottom-color: var(--color-outline-variant);
  box-shadow: 0 1px 20px rgba(0, 0, 0, 0.5);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-margin-desktop);
}

@media (max-width: 768px) {
  .nav__inner {
    padding: 0 var(--space-margin-mobile);
  }
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 12px;
  z-index: 1001;
}

.nav__logo-img {
  height: 48px;
  width: auto;
  transition: filter 0.3s ease;
}

.nav__logo:hover .nav__logo-img {
  filter: drop-shadow(0 0 8px rgba(0, 229, 255, 0.4));
}

.nav__logo-text {
  font-family: var(--font-headline);
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--color-on-surface);
  text-transform: uppercase;
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav__link {
  font-family: var(--font-headline);
  font-size: var(--text-label-size);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-on-surface-variant);
  transition: color 0.2s ease;
  position: relative;
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-primary);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-primary-container);
  box-shadow: 0 0 6px rgba(0, 229, 255, 0.4);
  transition: width 0.25s ease;
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__cta {
  font-size: 0.6875rem;
  padding: 8px 20px;
}

/* Mobile menu toggle */
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  z-index: 1001;
}

.nav__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-on-surface);
  transition: all 0.25s ease;
  transform-origin: center;
}

.nav__toggle.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle.open span:nth-child(2) {
  opacity: 0;
}

.nav__toggle.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

@media (max-width: 768px) {
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 28px;
    background: rgba(12, 14, 17, 0.98);
    backdrop-filter: blur(16px);
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
  }

  .nav__links.open {
    transform: translateX(0);
  }

  .nav__link {
    font-size: 1.125rem;
    font-weight: 700;
  }
}

/* Language Toggle */
.lang-toggle {
  position: relative;
  margin-left: 16px;
}

@media (max-width: 768px) {
  .lang-toggle {
    margin-left: 0;
  }
}

.lang-toggle__btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  background: transparent;
  border: 1px solid var(--color-outline-variant);
  color: var(--color-on-surface-variant);
  padding: 4px 10px;
  font-family: var(--font-body);
  font-size: 0.75rem;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.lang-toggle__btn:hover {
  border-color: var(--color-primary-container);
  color: var(--color-primary);
}

.lang-toggle__arrow {
  font-size: 0.6rem;
  transition: transform 0.2s ease;
}

.lang-toggle__btn:hover .lang-toggle__arrow {
  transform: rotate(180deg);
}

.lang-dropdown {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--color-surface-container);
  border: 1px solid var(--color-outline-variant);
  min-width: 140px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: all 0.2s ease;
  z-index: 1001;
}

.lang-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.lang-dropdown__item {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  color: var(--color-on-surface-variant);
  background: transparent;
  border: none;
  width: 100%;
  text-align: left;
  cursor: pointer;
  transition: all 0.15s ease;
}

.lang-dropdown__item:first-child {
  border-bottom: 1px solid var(--color-outline-variant);
}

.lang-dropdown__item:hover {
  background: var(--color-surface-container-high);
  color: var(--color-on-surface);
}

.lang-dropdown__item.active {
  color: var(--color-primary);
  background: rgba(0, 229, 255, 0.06);
}

.lang-dropdown__item.active::before {
  content: '✓';
  color: var(--color-primary-container);
  font-size: 0.7rem;
}