.marketing-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--um-color-bg-surface);
  border-bottom: 1px solid var(--um-color-border-light);
  height: 72px;
  display: flex;
  align-items: center;
}

.marketing-nav__inner {
  width: 100%;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  height: 100%;
}

/* Zone 1 */
.marketing-nav__logo {
  flex: 0 0 auto;
  margin-right: 24px;
}

.nav-logo-link {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.nav-logo-mark {
  display: inline-flex;
  align-items: center;
  flex-shrink: 0;
}

.nav-logo-mark--theme-dark {
  display: none;
}

:root[data-theme="dark"] .nav-logo-mark--theme-light {
  display: none;
}

:root[data-theme="dark"] .nav-logo-mark--theme-dark {
  display: inline-flex;
}

.nav-logo-img {
  display: block;
  height: 36px;
  width: 36px;
  flex-shrink: 0;
}

.nav-logo-wordmark {
  font-family: var(--um-font-heading);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--um-color-text);
  white-space: nowrap;
}

.nav-logo-up {
  color: var(--um-color-accent);
}

/* Zone 2 */
.marketing-nav__links {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--um-color-text-secondary);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.15s ease;
}

.nav-link:hover,
.nav-link--active {
  color: var(--um-color-primary);
  font-weight: 600;
}

/* Zone 3 */
.marketing-nav__controls {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: 24px;
}

.nav-lang__select {
  font-size: 12px;
  font-weight: 500;
  color: var(--um-color-text-tertiary);
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0 4px;
  appearance: auto;
}

.nav-lang__select:focus {
  outline: none;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  flex-shrink: 0;
}

.theme-toggle__checkbox {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
}

.theme-toggle__track {
  width: 44px;
  height: 24px;
  border-radius: 100px;
  background: var(--um-color-border);
  position: relative;
  transition: background 0.2s ease;
  flex-shrink: 0;
}

.theme-toggle__checkbox:checked + .theme-toggle__track {
  background: var(--um-color-primary);
}

.theme-toggle__thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--um-color-bg-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 0.2s ease;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.theme-toggle__checkbox:checked + .theme-toggle__track .theme-toggle__thumb {
  transform: translateX(20px);
}

.theme-toggle__icon {
  width: 10px;
  height: 10px;
  position: absolute;
  transition: opacity 0.15s ease;
  color: var(--um-color-text-secondary);
}

.theme-toggle__icon--sun {
  opacity: 1;
}

.theme-toggle__icon--moon {
  opacity: 0;
}

.theme-toggle__checkbox:checked + .theme-toggle__track .theme-toggle__icon--sun {
  opacity: 0;
}

.theme-toggle__checkbox:checked + .theme-toggle__track .theme-toggle__icon--moon {
  opacity: 1;
}

.btn-nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 8px;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
  flex-shrink: 0;
}

.btn-nav--ghost {
  border: 1px solid var(--um-color-border);
  color: var(--um-color-text);
  background: transparent;
}

.btn-nav--ghost:hover {
  border-color: var(--um-color-primary);
  color: var(--um-color-primary);
}

.btn-nav--filled {
  background: var(--um-color-accent);
  color: #fff;
  border: 1px solid transparent;
}

.btn-nav--filled:hover {
  background: var(--um-color-accent-light);
}

@media (max-width: 1023px) {
  .marketing-nav__links {
    display: none;
  }

  .nav-lang__select {
    display: none;
  }

  .marketing-nav__inner {
    padding: 0 20px;
  }

  .marketing-nav__logo {
    margin-right: 0;
  }

  .marketing-nav__controls {
    margin-left: auto;
    gap: 12px;
  }
}

@media (max-width: 767px) {
  .marketing-nav {
    height: auto;
    min-height: 72px;
  }

  .marketing-nav__inner {
    padding: 10px 16px;
  }

  .nav-logo-link {
    gap: 10px;
  }

  .nav-logo-wordmark {
    font-size: 15px;
  }

  .marketing-nav__controls {
    gap: 8px;
  }

  .btn-nav {
    padding: 8px 14px;
    font-size: 13px;
  }
}

@media (max-width: 560px) {
  .marketing-nav__inner {
    padding: 10px 12px;
  }

  .nav-logo-wordmark {
    display: none;
  }

  .marketing-nav__controls {
    gap: 6px;
  }

  .btn-nav {
    padding: 8px 12px;
  }
}