.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: var(--header-h);
  padding-inline: clamp(18px, 3vw, 44px);
  border-bottom: 1px solid var(--surface-line);
  transition: background var(--dur-2) var(--ease), height var(--dur-2) var(--ease);
}

.header.is-scrolled {
  height: 70px;
  background: var(--bg-0);
}

.logo {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
}

.logo__wordmark {
  height: 26px;
  width: auto;
  transition: opacity var(--dur-2) var(--ease);
}

.logo:hover .logo__wordmark {
  opacity: 0.8;
}

.nav {
  display: flex;
  align-items: center;
  gap: clamp(6px, 1.4vw, 22px);
  margin-inline: auto;
}

.nav__link {
  position: relative;
  padding: 10px 12px;
  font-weight: 600;
  font-size: 15.5px;
  color: var(--text-0);
  transition: color var(--dur-2) var(--ease);
}

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

.header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.lang-switch {
  position: relative;
}

.lang-switch__btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 44px;
  padding: 0 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--surface-line-strong);
  font-weight: 600;
  font-size: 13.5px;
  color: var(--text-0);
  transition: border-color var(--dur-2) var(--ease);
}

.lang-switch__btn:hover {
  border-color: var(--accent);
}

.lang-switch__btn svg {
  width: 14px;
  height: 14px;
  transition: transform var(--dur-2) var(--ease);
}

.lang-switch.is-open .lang-switch__btn svg {
  transform: rotate(180deg);
}

.lang-switch__menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  min-width: 160px;
  padding: 8px;
  background: var(--surface-strong);
  border: 1px solid var(--surface-line-strong);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-8px);
  transition: opacity var(--dur-2) var(--ease), transform var(--dur-2) var(--ease), visibility var(--dur-2);
}

.lang-switch.is-open .lang-switch__menu {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.lang-switch__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 10px 14px;
  border-radius: var(--r-sm);
  font-size: 14.5px;
  font-weight: 500;
  color: var(--text-1);
  transition: color var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
}

.lang-switch__item:hover,
.lang-switch__item.is-active {
  color: var(--text-0);
  background: var(--bg-2);
}

.lang-switch__item.is-active::after {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.burger {
  display: none;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
}

.burger span {
  display: block;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
  transition: transform var(--dur-2) var(--ease), opacity var(--dur-2) var(--ease), width var(--dur-2) var(--ease);
}

.burger span:nth-child(1) { width: 30px; }
.burger span:nth-child(2) { width: 22px; }
.burger span:nth-child(3) { width: 14px; }

body.menu-open .burger span:nth-child(1) { width: 26px; transform: translateY(8px) rotate(45deg); }
body.menu-open .burger span:nth-child(2) { opacity: 0; }
body.menu-open .burger span:nth-child(3) { width: 26px; transform: translateY(-8px) rotate(-45deg); }

.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: 95;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  padding: calc(var(--header-h) + 20px) var(--gutter) 40px;
  background: var(--bg-0);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-2) var(--ease), visibility var(--dur-2);
}

body.menu-open {
  overflow: hidden;
}

body.menu-open .mobile-menu {
  opacity: 1;
  visibility: visible;
}

.mobile-menu__link {
  padding: 12px 0;
  border-bottom: 1px solid var(--surface-line);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 7vw, 2.2rem);
  text-transform: uppercase;
  color: var(--text-0);
}

.mobile-menu__link.is-active {
  color: var(--accent);
}

.mobile-menu__cta {
  margin-top: 28px;
}

.sticky-cta {
  position: fixed;
  left: 12px;
  right: 12px;
  bottom: 12px;
  z-index: 80;
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 12px 12px 20px;
  border-radius: var(--r-pill);
  background: var(--surface-strong);
  border: 1px solid var(--surface-line-strong);
  transform: translateY(140%);
  transition: transform var(--dur-3) var(--ease);
}

.sticky-cta.is-visible {
  transform: none;
}

.sticky-cta__text {
  display: grid;
  font-weight: 600;
  font-size: 14.5px;
  line-height: 1.25;
  color: var(--text-0);
}

.sticky-cta__text small {
  font-weight: 400;
  font-size: 12px;
  color: var(--text-2);
}

@media (max-width: 1080px) {
  .nav,
  .header__cta {
    display: none;
  }

  .burger {
    display: flex;
  }
}

@media (max-width: 640px) {
  .sticky-cta {
    display: flex;
  }
}