/* Navigation: fixed header, mobile hamburger, language toggle.
   Progressive: works without JS (links are visible), JS adds mobile overlay. */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.nav--scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-sm);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

/* --- Logo --- */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  text-decoration: none;
  flex-shrink: 0;
}

.nav__logo:hover {
  color: var(--color-primary-dark);
}

.nav__logo-icon {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
}

/* --- Desktop links --- */
.nav__links {
  display: none;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  padding: var(--space-2) 0;
  position: relative;
  transition: color var(--transition-fast);
}

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

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-primary);
  transform: scaleX(0);
  transition: transform var(--transition-fast);
}

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

/* --- Right section: language + CTA + hamburger --- */
.nav__actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* --- Language toggle --- */
.lang-toggle {
  display: flex;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.lang-toggle__btn {
  padding: var(--space-1) var(--space-3);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  background: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-fast);
  line-height: 1.5;
}

.lang-toggle__btn--active {
  background-color: var(--color-primary);
  color: var(--color-primary-on);
}

.lang-toggle__btn:hover:not(.lang-toggle__btn--active) {
  background-color: var(--color-surface-muted);
  color: var(--color-text-secondary);
}

/* Hide language toggle on legal pages (English only) */
.page-legal .lang-toggle {
  display: none;
}

/* --- Desktop CTA button in nav --- */
.nav__cta {
  display: none;
}

/* --- Hamburger button (mobile only) --- */
.nav__hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  cursor: pointer;
  background: none;
  border: none;
}

.nav__hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background-color: var(--color-text-primary);
  border-radius: 1px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

/* Hamburger -> X animation */
.nav--open .nav__hamburger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

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

/* Solid nav background when mobile menu is open - remove transparency
   and backdrop-filter that cause overlay to appear see-through on mobile */
.nav--open {
  background-color: #FFFFFF;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
}

/* --- Mobile overlay --- */
.nav__overlay {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  bottom: 0;
  background-color: var(--color-surface);
  padding: var(--space-8) var(--space-6);
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: transform var(--transition-base), opacity var(--transition-base), visibility var(--transition-base);
  z-index: 99;
}

.nav--open .nav__overlay {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
  background-color: #FFFFFF;
}

.nav__overlay-link {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border-light);
  display: block;
  text-decoration: none;
  min-height: 44px;
  display: flex;
  align-items: center;
}

.nav__overlay-link:hover {
  color: var(--color-primary);
}

.nav__overlay-cta {
  margin-top: auto;
}

/* Prevent body scroll when mobile nav is open */
body.nav-lock {
  overflow: hidden;
}

/* --- Desktop breakpoint --- */
@media (min-width: 1024px) {
  .nav__links {
    display: flex;
  }

  .nav__cta {
    display: inline-flex;
  }

  .nav__hamburger {
    display: none;
  }

  .nav__overlay {
    display: none;
  }
}

@media (min-width: 1280px) {
  .nav__inner {
    padding: 0 var(--space-8);
  }
}