/* ============================================
   Header / Navigation
   ============================================ */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--space-lg) 0;
  transition: all 0.5s var(--ease-out-expo);
}

.site-header--scrolled {
  background: rgba(10, 22, 40, 0.92);
  backdrop-filter: blur(20px) saturate(1.4);
  -webkit-backdrop-filter: blur(20px) saturate(1.4);
  padding: var(--space-md) 0;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.15);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* Logo */
.site-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  z-index: 1001;
}


.site-logo__text {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}

.site-logo__name {
  font-family: var(--font-accent);
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-white);
  letter-spacing: -0.02em;
}


/* Navigation */
.nav-main {
  display: flex;
  align-items: center;
  gap: var(--space-2xl);
}

.nav-links {
  display: flex;
  gap: var(--space-xl);
}

.nav-link {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 500;
  color: rgba(255, 255, 255, 0.75);
  position: relative;
  padding: var(--space-xs) 0;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link--active {
  color: var(--color-white);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-orange);
  border-radius: 1px;
  transition: width var(--transition-base);
}

.nav-link:hover::after,
.nav-link--active::after {
  width: 100%;
}

/* Nav Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

/* Language Switcher */
.lang-switch {
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  padding: 3px;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.lang-switch__btn {
  padding: 0.35rem 0.75rem;
  font-family: var(--font-accent);
  font-size: 0.72rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  /* WCAG 2.5.8: Minimum target size 24px */
  min-height: 24px;
  display: inline-flex;
  align-items: center;
}

.lang-switch__btn--active {
  background: var(--color-white);
  color: var(--color-midnight);
}

.lang-switch__btn:not(.lang-switch__btn--active):hover {
  color: var(--color-white);
}

/* CTA Button in Nav */
.nav-cta {
  padding: 0.6rem 1.4rem;
  background: transparent;
  color: var(--color-white);
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 600;
  border: 1.5px solid rgba(255, 255, 255, 0.5);
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
  white-space: nowrap;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
}

.nav-cta:hover {
  border-color: var(--color-white);
  background: rgba(255, 255, 255, 0.1);
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 44px;
  min-height: 44px;
  padding: 4px 8px;
  z-index: 1001;
  justify-content: center;
  align-items: center;
}

.menu-toggle__bar {
  width: 100%;
  height: 2px;
  background: var(--color-white);
  border-radius: 1px;
  transition: all var(--transition-base);
  transform-origin: center;
}

.menu-toggle--open .menu-toggle__bar:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.menu-toggle--open .menu-toggle__bar:nth-child(2) {
  opacity: 0;
}

.menu-toggle--open .menu-toggle__bar:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Navigation Overlay */
.mobile-nav {
  display: flex;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--color-midnight);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-base), visibility var(--transition-base);
}

.mobile-nav--open {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.mobile-nav__link {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--color-white);
  opacity: 0;
  transform: translateY(20px);
  animation: mobile-link-in 0.5s var(--ease-out-expo) forwards;
}

.mobile-nav__link:nth-child(1) { animation-delay: 100ms; }
.mobile-nav__link:nth-child(2) { animation-delay: 150ms; }
.mobile-nav__link:nth-child(3) { animation-delay: 200ms; }
.mobile-nav__link:nth-child(4) { animation-delay: 250ms; }
.mobile-nav__link:nth-child(5) { animation-delay: 300ms; }

@keyframes mobile-link-in {
  to { opacity: 1; transform: translateY(0); }
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .nav-main {
    display: none;
  }

  .menu-toggle {
    display: flex;
  }

  .nav-actions .nav-cta {
    display: none;
  }
}