.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-soft);
  transition: background var(--transition), box-shadow var(--transition);
}

.header.scrolled {
  background: rgba(255, 255, 255, 0.98);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.06);
}

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

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

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

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

.header__nav-link {
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition), background var(--transition);
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
}

.header__nav-link:hover,
.header__nav-link.active {
  color: var(--color-primary);
  background: rgba(var(--color-primary-rgb), 0.08);
}

.header__menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 6px;
  border-radius: var(--radius-sm);
}

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

.header__menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 1px;
  transition: var(--transition);
}

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

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

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

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

  .header__nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    justify-content: flex-start;
    padding: var(--spacing-xl) var(--spacing-lg);
    gap: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    transform: translateX(100%);
    transition: transform var(--transition);
    box-shadow: var(--shadow-card);
  }

  .header__nav.open {
    transform: translateX(0);
  }

  .header__nav-link {
    font-size: var(--font-size-base);
    width: 100%;
    padding: 0.75rem 1rem;
  }
}