.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: var(--z-header);
  background: rgba(255, 255, 255, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.header.scrolled {
  border-bottom-color: var(--color-gray-200);
  box-shadow: var(--shadow-sm);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: relative;
  height: 80px;
  gap: var(--spacing-xl);
}

/* Logo */
.header__logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  flex-shrink: 0;
}

.header__logo-img {
  height: 42px;
  width: auto;
}

.header__logo-text {
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

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

/* Navigation */
.header__nav {
  display: flex;
  align-items: center;
  gap: 48px;
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  justify-content: center;
}

.nav__item {
  position: relative;
}

.nav__link {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: 16px;
  font-weight: var(--font-weight-semibold);
  color: #222222;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast), background var(--transition-fast);
  white-space: nowrap;
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-primary);
  background: rgba(107, 78, 255, 0.06);
}

.nav__link--has-dropdown .nav__arrow {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.nav__item:hover .nav__arrow {
  transform: rotate(180deg);
}

/* Dropdown */
.nav__dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 180px;
  background: var(--color-white);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  border: 1px solid var(--color-gray-200);
  padding: var(--spacing-sm) 0;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility var(--transition-fast);
  transform: translateX(-50%) translateY(-8px);
  z-index: var(--z-dropdown);
}

.nav__item:hover .nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

.nav__dropdown-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.nav__dropdown-link:hover {
  color: var(--color-primary);
  background: rgba(107, 78, 255, 0.06);
}

/* Header Actions */
.header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 8px 22px;
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 14px;
  font-weight: var(--font-weight-semibold);
  border-radius: 8px;
  transition: all var(--transition-fast);
  white-space: nowrap;
  cursor: pointer;
  height: 40px;
}

.btn--ghost {
  color: #444444;
  background: #FFFFFF;
  border: 1px solid #8C8C8C;
}

.btn--ghost:hover {
  color: #5528D1;
  border-color: #5528D1;
  background: rgba(85, 40, 209, 0.06);
}

.btn--primary {
  color: #FAFAFA;
  background: #5528D1;
  border: 1px solid #5528D1;
}

.btn--primary:hover {
  background: #4420B0;
  border-color: #4420B0;
  box-shadow: var(--shadow-purple);
  transform: translateY(-1px);
}

/* Mobile Menu Toggle */
.header__menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}

.header__menu-toggle:hover {
  background: var(--color-gray-100);
}

.header__menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.header__menu-toggle.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

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

.header__menu-toggle.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Nav */
.header__mobile-nav {
  display: none;
  flex-direction: column;
  background: var(--color-white);
  border-top: 1px solid var(--color-gray-200);
  padding: var(--spacing-md) 0 var(--spacing-lg);
}

.header__mobile-nav.open {
  display: flex;
}

.mobile-nav__link {
  padding: 0.75rem var(--container-padding);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-fast), background var(--transition-fast);
}

.mobile-nav__link:hover {
  color: var(--color-primary);
  background: rgba(107, 78, 255, 0.04);
}

.mobile-nav__divider {
  height: 1px;
  background: var(--color-gray-200);
  margin: var(--spacing-sm) var(--container-padding);
}

.mobile-nav__actions {
  display: flex;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--container-padding) 0;
}

.mobile-nav__actions .btn {
  flex: 1;
  justify-content: center;
}

/* Responsive */
@media (max-width: 768px) {
  .header__nav,
  .header__actions {
    display: none;
  }

  .header__menu-toggle {
    display: flex;
  }
}