.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 1000;
  background-color: oklch(1 0 0 / 0.95);
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 10px oklch(0 0 0 / 0.1);
  transition: background-color var(--transition-normal);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--spacing-md);
}

.header-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  font-weight: 700;
  font-size: var(--font-size-base);
  color: var(--color-primary);
}

.header-logo-image {
  width: 40px;
  height: 40px;
  object-fit: contain;
}

.header-nav {
  display: flex;
  align-items: center;
}

.header-nav-list {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.header-nav-link {
  position: relative;
  font-weight: 500;
  color: var(--color-gray-700);
  padding-block: var(--spacing-xs);
}

.header-nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-fast);
}

.header-nav-link:hover {
  color: var(--color-primary);
}

.header-nav-link:hover::after {
  width: 100%;
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  z-index: 1001;
}

.hamburger-line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--color-gray-900);
  transition: all var(--transition-fast);
}

.hamburger-line:nth-child(1) {
  transform: translateY(-6px);
}

.hamburger-line:nth-child(3) {
  transform: translateY(6px);
}

.hamburger.active .hamburger-line:nth-child(1) {
  transform: translateY(0) rotate(45deg);
}

.hamburger.active .hamburger-line:nth-child(2) {
  opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
  transform: translateY(-2px) rotate(-45deg);
}

.mobile-nav {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100dvh;
  background-color: oklch(1 0 0 / 0.98);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.mobile-nav.active {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-list {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  height: 100%;
  gap: var(--spacing-sm);
}

.mobile-nav-link {
  font-size: var(--font-size-base);
  font-weight: 500;
  color: var(--color-gray-700);
  padding: var(--spacing-sm);
  transition: color var(--transition-fast);
}

.mobile-nav-link:hover {
  color: var(--color-primary);
}

@media (width < 768px) {
  .header-nav {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-nav {
    display: block;
  }

  .header-logo-image {
    width: 32px;
    height: 32px;
  }
}