/* ============================================================
   nav.css — Navigation bar
   ============================================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  transition: background var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  border-bottom: 1px solid transparent;
}

/* State: scrolled past hero */
.nav--scrolled {
  background: rgba(8, 12, 20, 0.85);
  border-bottom-color: var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
}

.nav__inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

/* ── Logo ── */
.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  flex-shrink: 0;
}

.nav__logo-img {
  height: 40px;
  width: auto;
  display: block;
}

/* ── Desktop nav links ── */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  list-style: none;
}

.nav__link {
  display: inline-flex;
  align-items: center;
  padding: 8px 14px;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text-primary);
  background: var(--glass-bg);
}

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

/* ── Right-side controls ── */
.nav__controls {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-shrink: 0;
}

/* ── Language toggle ── */
.lang-toggle {
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-full);
  padding: 3px;
}

.lang-toggle__btn {
  padding: 5px 12px;
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.05em;
  color: var(--color-text-secondary);
  border-radius: var(--radius-full);
  background: transparent;
  border: none;
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.lang-toggle__btn.active {
  background: var(--gradient-brand);
  color: #fff;
}

.lang-toggle__btn:not(.active):hover {
  color: var(--color-text-primary);
}

/* ── Hamburger button (mobile only) ── */
.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  border-radius: var(--radius-sm);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  cursor: pointer;
  transition: background var(--transition-fast);
}

.nav__hamburger:hover {
  background: var(--glass-bg-hover);
}

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

.nav__hamburger.open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.nav__hamburger.open span:nth-child(2) {
  opacity: 0;
}
.nav__hamburger.open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ── Mobile full-screen menu ── */
.nav__mobile-menu {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 999;
  background: rgba(8, 12, 20, 0.97);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.nav__mobile-menu.open {
  display: flex;
  opacity: 1;
  pointer-events: all;
}

.nav__mobile-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  list-style: none;
}

.nav__mobile-link {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  padding: var(--space-1) var(--space-3);
}

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

.nav__mobile-lang {
  margin-top: var(--space-4);
}