.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: var(--z-header);
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

.header--scrolled {
  background-color: var(--color-white);
  box-shadow: var(--shadow-header);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.header__logo img {
  height: 40px;
  width: auto;
}

.header__logo-text {
  font-family: var(--font-logo);
  font-size: 22px;
  font-weight: 800;
  color: var(--color-white);
  letter-spacing: 4px;
  transition: color var(--transition-base);
}

.header--scrolled .header__logo-text {
  color: var(--color-primary);
}

.header__nav {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.header__nav-list {
  display: flex;
  gap: var(--space-lg);
}

.header__nav-link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: rgba(255, 255, 255, 0.9);
  padding: var(--space-sm) 0;
  position: relative;
  transition: color var(--transition-fast);
}

.header--scrolled .header__nav-link {
  color: var(--color-text);
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-base);
}

.header__nav-link:hover::after,
.header__nav-link.active::after {
  width: 100%;
}

.header__nav-link:hover {
  color: var(--color-accent);
}

.header__menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-sm);
}

.header__menu-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-white);
  transition: all var(--transition-base);
}

.header--scrolled .header__menu-toggle span {
  background-color: var(--color-primary);
}

.header__menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.header__menu-toggle.active span:nth-child(2) {
  opacity: 0;
}

.header__menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

.header__lang {
  margin-left: var(--space-md);
}

.header__lang-select {
  appearance: none;
  -webkit-appearance: none;
  background: rgba(255, 255, 255, 0.15);
  color: var(--color-white);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--border-radius-sm);
  padding: 4px 24px 4px 10px;
  font-size: var(--font-size-sm);
  cursor: pointer;
  outline: none;
  transition: all var(--transition-fast);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' fill='none' stroke='white' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 6px center;
}

.header--scrolled .header__lang-select {
  background: rgba(0, 0, 0, 0.05);
  color: var(--color-text);
  border-color: var(--color-border);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' fill='none' stroke='%23333' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 6px center;
}

.header__lang-select:hover {
  background: rgba(255, 255, 255, 0.25);
}

.header--scrolled .header__lang-select:hover {
  background: rgba(0, 0, 0, 0.1);
}

.header__lang-select option {
  color: var(--color-text);
  background: var(--color-white);
}

@media (max-width: 768px) {
  .header__menu-toggle {
    display: flex;
  }

  .header__nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background-color: var(--color-white);
    box-shadow: var(--shadow-header);
    padding: var(--space-lg);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: all var(--transition-base);
  }

  .header__nav--open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .header__nav-list {
    flex-direction: column;
    gap: var(--space-md);
  }

  .header__nav-link {
    color: var(--color-text);
    font-size: var(--font-size-base);
  }

  .header__lang {
    margin-left: 0;
  }

  .header__lang-select {
    background: rgba(0, 0, 0, 0.05);
    color: var(--color-text);
    border-color: var(--color-border);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath d='M3 5l3 3 3-3' fill='none' stroke='%23333' stroke-width='1.5'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 6px center;
  }
}