/* ── Site header ──────────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  transition: background-color var(--transition),
              box-shadow var(--transition),
              height var(--transition);
}

.site-header.scrolled {
  background-color: rgba(28, 26, 23, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 1px 0 rgba(214, 206, 188, 0.15);
  height: 60px;
}

/* ── Nav layout ───────────────────────────────────────── */
.nav {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  height: 100%;
}

/* ── Logo ─────────────────────────────────────────────── */
.nav__logo {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 400;
  color: var(--color-white);
  letter-spacing: 0.02em;
  white-space: nowrap;
  margin-right: auto;
}

/* ── Nav links ────────────────────────────────────────── */
.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav__links a {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.85);
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition);
}

.nav__links a:hover,
.nav__links a.active {
  color: var(--color-white);
  border-bottom-color: var(--color-accent-2);
}

/* ── Language switcher ────────────────────────────────── */
.nav__lang {
  display: flex;
  align-items: center;
  gap: 6px;
  color: rgba(255, 255, 255, 0.4);
  font-size: var(--text-xs);
}

.lang-btn {
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  color: rgba(255, 255, 255, 0.55);
  padding: 2px 4px;
  transition: color var(--transition);
}

.lang-btn:hover,
.lang-btn.active {
  color: var(--color-white);
}

.lang-btn.active {
  color: var(--color-accent-2);
}

/* ── Hamburger button ─────────────────────────────────── */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  padding: 2px;
}

.nav__toggle span {
  display: block;
  width: 100%;
  height: 1px;
  background-color: var(--color-white);
  transform-origin: center;
  transition: transform var(--transition), opacity var(--transition);
}

.nav__toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav__toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav__toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ── Mobile ───────────────────────────────────────────── */
@media (max-width: 900px) {
  .nav__toggle {
    display: flex;
  }

  .nav__links {
    display: none;
    position: fixed;
    inset: 0;
    background-color: rgba(28, 26, 23, 0.97);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: var(--space-md);
    z-index: 99;
  }

  .nav__links.is-open {
    display: flex;
  }

  .nav__links a {
    font-size: var(--text-xl);
    letter-spacing: 0.04em;
  }

  .nav__lang {
    display: none;
  }

  .nav__links.is-open + .nav__lang {
    display: flex;
    position: fixed;
    bottom: var(--space-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 100;
    gap: var(--space-sm);
  }

  .nav__links.is-open + .nav__lang .lang-btn {
    font-size: var(--text-base);
    padding: 4px 8px;
  }
}