/**
 * Sticky header and navigation.
 */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background-color: var(--color-bg-header);
  border-bottom: var(--border-width) solid var(--border-color);
  box-shadow: var(--shadow-header);
}

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

.header__nav {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
}

.header__logo {
  display: flex;
  align-items: center;
}

.header__logo-img {
  display: block;
  max-height: 3.5rem;
  width: auto;
  height: auto;
  object-fit: contain;
}

.header__logo:hover .header__logo-img {
  opacity: 0.9;
}


.header__list {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin: 0;
  padding: 0;
  list-style: none;
}

.header__item {
  position: relative;
  flex-shrink: 0;
}

.header__link {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-title);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background-color var(--transition-fast);
  white-space: nowrap;
}

.header__link:hover {
  color: var(--color-link);
  background-color: var(--color-bg);
}

.header__link--active {
  color: var(--color-title);
}

.header__link--parent {
  position: relative;
  padding-inline-end: 1.5em;
}

.header__link--parent::after {
  content: "";
  position: absolute;
  inset-inline-end: var(--space-sm);
  top: 50%;
  margin-top: -2px;
  border: 5px solid transparent;
  border-top-color: currentColor;
  border-bottom: none;
  opacity: 0.7;
}

.header__dropdown {
  position: relative;
}

.header__dropdown:hover .header__sub,
.header__dropdown:focus-within .header__sub {
  opacity: 1;
  visibility: visible;
}

.header__sub {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 18rem;
  margin: 0;
  padding: var(--space-sm) 0;
  list-style: none;
  background-color: var(--color-bg-header);
  border: var(--border-width) solid #eaecef;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), visibility var(--transition-fast);
  z-index: 10;
}

.header__sublink {
  display: block;
  padding: var(--space-sm) var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.header__sublink:hover {
  background-color: var(--color-bg);
  color: var(--color-link);
}

.header__sublink--active {
  color: var(--color-text);
}

.header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-shrink: 0;
}

.header__lang {
  display: flex;
  gap: var(--space-sm);
}

.header__lang-btn {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 var(--space-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
  border: none;
  border-radius: var(--radius-xl);
  background: var(--color-bg-header);
  color: var(--color-text);
  text-decoration: none;
  box-shadow: none;
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.header__lang-btn:hover {
  background-color: var(--color-secondary);
  color: #fff;
}

.header__lang-btn--active {
  background-color: var(--color-secondary);
  color: #fff;
}

.header__cta {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 0 var(--space-lg);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-normal);
  border: none;
  border-radius: var(--radius-xl);
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  transition: background-color var(--transition-fast);
}

.header__cta:hover {
  background: var(--color-primary-light);
  color: #fff;
}

/* Mobile: hide nav by default, show menu button */
.header__menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: var(--border-width) solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--color-bg-header);
  color: var(--color-text);
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

.header__menu-btn:hover {
  background-color: var(--color-bg);
}

.header__menu-btn::before {
  content: "";
  width: 1.25rem;
  height: 2px;
  background: currentColor;
  box-shadow: 0 -6px 0 currentColor, 0 6px 0 currentColor;
}

@media (max-width: 80rem) {
  .header__inner {
    flex-wrap: nowrap;
  }

  .header__nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    pointer-events: none;
    padding: 0 var(--container-padding);
    background: var(--color-bg-header);
    border-top: var(--border-width) solid var(--border-color);
    box-shadow: var(--shadow-md);
    z-index: 50;
    transition: max-height var(--transition-normal), opacity var(--transition-normal);
  }

  .header__nav.is-open {
    max-height: 75vh;
    opacity: 1;
    pointer-events: auto;
    padding: var(--space-md) var(--container-padding) var(--space-lg);
  }

  .header__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .header__item {
    margin: 0;
  }

  .header__link {
    padding: var(--space-md) 0;
  }

  .header__dropdown {
    display: block;
  }

  .header__dropdown .header__sub {
    display: block;
    max-height: 0;
    overflow: hidden;
    position: static;
    min-width: 0;
    margin: 0;
    padding: 0 var(--space-md) 0 0;
    border: none;
    border-radius: 0;
    box-shadow: none;
    list-style: none;
    transition: max-height var(--transition-normal);
  }

  .header__dropdown.is-open .header__sub {
    max-height: 50rem;
    padding: var(--space-sm) var(--space-md) 0 var(--space-md);
  }

  .header__sublink {
    display: block;
    padding: var(--space-sm) 0;
  }

  .header__actions {
    order: 2;
    margin-left: auto;
  }

  .header__menu-btn {
    order: 2;
    display: flex;
  }
}