header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background-color: var(--color-white);
  overflow: hidden;
  transition: height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

header .header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background-color 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  padding: 50px 60px;
  position: relative;
  z-index: 2;
}

header .header-container .logo {
  display: flex;
  align-items: center;
  gap: 10px;
}

header .header-container .logo a { 
  display: block;
  width: 200px;
  aspect-ratio: 400 / 145;
  background-image: url('/images/logo.png');
  background-size: contain;
  background-repeat: no-repeat;
  background-position: center;
  transition: background-image 0.3s ease;
}

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

header .header-container .header-nav-list {
  display: flex;
  align-items: center;
  gap: 100px;
}

header .header-container .header-nav-list li {
  font-size: 30px;
  color: var(--color-primary);
}

header .header-container .header-nav-list li a {
  color: var(--color-primary);
  transition: color 0.3s ease;
  position: relative;
  display: block;
}

header .header-container .header-nav-list li.has-megamenu {
  position: relative;
}

/* 햄버거 메뉴 버튼 */
.mobile-menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: space-around;
  width: 30px;
  height: 30px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: 0;
  z-index: 101;
  position: relative;
}

.mobile-menu-toggle span {
  width: 100%;
  height: 3px;
  background-color: var(--color-primary);
  border-radius: 3px;
  transition: all 0.3s ease;
  transform-origin: center;
}

header.blue .mobile-menu-toggle span {
  background-color: var(--color-white);
}

.mobile-menu-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(8px, 8px);
}

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

.mobile-menu-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(8px, -8px);
}

/* 모바일 메뉴 오버레이 */
.mobile-menu-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 98;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.mobile-menu-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

/* 모바일 메뉴 */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  right: -100%;
  width: 80%;
  max-width: 320px;
  height: 100%;
  background-color: var(--color-white);
  z-index: 99;
  transition: right 0.3s ease;
  overflow-y: auto;
  padding-top: 80px;
  box-shadow: -2px 0 10px rgba(0, 0, 0, 0.1);
}

.mobile-menu.active {
  right: 0;
}

.mobile-menu-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.mobile-menu-list li {
  border-bottom: 1px solid #e0e0e0;
}

.mobile-menu-list li a {
  display: block;
  padding: 20px 30px;
  font-size: 18px;
  color: var(--color-text-primary);
  text-decoration: none;
  transition: background-color 0.3s ease;
}

.mobile-menu-list li a:hover {
  background-color: #f5f5f5;
}

.mobile-submenu {
  display: none;
  list-style: none;
  padding: 0;
  margin: 0;
  background-color: #f9f9f9;
}

.mobile-submenu.active {
  display: block;
}

.mobile-submenu li {
  border-bottom: 1px solid #e8e8e8;
}

.mobile-submenu li a {
  padding-left: 50px;
  font-size: 16px;
  color: var(--color-text-secondary);
}

.mobile-menu-list li.has-megamenu > a::after {
  content: '+';
  float: right;
  font-size: 20px;
  transition: transform 0.3s ease;
}

.mobile-menu-list li.has-megamenu.active > a::after {
  transform: rotate(45deg);
}

/* 메가메뉴 패널 */
header .megamenu-panel {
  position: relative;
  width: 100%;
  height: 0;
  overflow: hidden;
  transition: height 0.4s ease-out;
  z-index: 1;
  pointer-events: none;
  padding: 0 60px;
  top: -50px;
  background-color: var(--color-white);
}

header .megamenu-panel.active {
  pointer-events: auto;
  padding: 40px 60px 60px;
  transition: height 0.4s ease-out, padding 0.4s ease-out;
}

header .megamenu-content {
  display: block;
  opacity: 0;
  transition: opacity 0.4s ease;
  position: absolute;
  top: 40px;
  left: 0;
  visibility: hidden;
}

header .megamenu-content.active {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.6s ease;
}

header .megamenu-list {
  display: flex;
  flex-direction: column;
  gap: 15px;
  list-style: none;
  padding: 0;
  margin: 0;
}

header .megamenu-list li {
  padding: 0;
  margin: 0;
}

header .megamenu-list li a {
  display: block;
  font-size: 23px;
  color: var(--color-primary);
  transition: color 0.2s ease;
  padding: 8px 0;
  white-space: nowrap;
}

header.blue {
  background-color: var(--color-primary);
}

header.blue .header-container {
  background-color: var(--color-primary);
}

header.blue .header-container .logo a {
  background-image: url('/images/logo-white.png');
}

header.blue .header-container .header-nav-list li a {
  color: var(--color-white);
}

header.blue .megamenu-panel {
  background-color: var(--color-primary);
}

header.blue .megamenu-list li a {
  color: var(--color-white);
}

header.blue .megamenu-list li a:hover {
  color: var(--color-white);
}

.footer-container {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 20px 60px;
  z-index: 100;
  transition: all 0.3s ease;
}

.footer-container .footer-logo img {
  width: 100%;
  max-width: 120px;
  object-fit: contain;
}

.footer-container .footer-content {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
}

.footer-container .footer-content .copyright {
  font-size: 23px;
  color: var(--color-text-secondary);
}

.footer-container .footer-content .footer-list {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
}

.footer-container .footer-content .footer-list li img {
  width: 100%;
  max-width: 40px;
  object-fit: contain;
}

/* 반응형 미디어 쿼리 */
@media (max-width: 1024px) {
  header .header-container {
    padding: 30px 40px;
  }
  
  header .header-container .logo a {
    width: 150px;
  }
  
  header .header-container .header-nav-list {
    gap: 60px;
  }
  
  header .header-container .header-nav-list li {
    font-size: 24px;
  }
  
  header .megamenu-panel {
    padding: 0 40px;
  }
  
  header .megamenu-panel.active {
    padding: 30px 40px 40px;
  }
  
  .footer-container {
    padding: 15px 40px;
  }
  
  .footer-container .footer-content .copyright {
    font-size: 18px;
  }
}

@media (max-width: 768px) {
  /* 햄버거 메뉴 표시 */
  .mobile-menu-toggle {
    display: flex;
  }
  
  /* 기존 네비게이션 숨김 */
  header .header-container .header-nav {
    display: none;
  }
  
  /* 모바일 메뉴 표시 */
  .mobile-menu-overlay,
  .mobile-menu {
    display: block;
  }
  
  header .header-container {
    padding: 15px 15px;
  }
  
  header .header-container .logo a {
    width: 120px;
  }
  
  header .megamenu-panel {
    display: none;
  }
  
  .footer-container {
    padding: 10px 20px;
  }
  
  .footer-container .footer-logo {
    display: none;
  }
  
  .footer-container .footer-content {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 0;
  }
  
  .footer-container .footer-content .copyright {
    font-size: 12px;
    margin: 0;
  }
  
  .footer-container .footer-content .footer-list {
    gap: 15px;
    margin: 0;
  }
  
  .footer-container .footer-content .footer-list li img {
    max-width: 24px;
  }
}

@media (max-width: 480px) {
  header .header-container {
    padding: 12px 12px;
  }
  
  header .header-container .logo a {
    width: 100px;
  }
  
  .mobile-menu {
    width: 85%;
    max-width: 280px;
  }
  
  .mobile-menu-list li a {
    padding: 18px 25px;
    font-size: 16px;
  }
  
  .mobile-submenu li a {
    padding-left: 45px;
    font-size: 14px;
  }
  
  .footer-container {
    padding: 8px 15px;
  }
  
  .footer-container .footer-logo {
    display: none;
  }
  
  .footer-container .footer-content {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 0;
  }
  
  .footer-container .footer-content .copyright {
    font-size: 11px;
    margin: 0;
  }
  
  .footer-container .footer-content .footer-list {
    gap: 12px;
    margin: 0;
  }
  
  .footer-container .footer-content .footer-list li img {
    max-width: 20px;
  }
}