.header .inner {
  max-width: 1920px;
  margin: 0 auto;
  padding: 0 20px 0;
  transition: background-color 0.3s;
}

.header .inner.scrolled {
  background-color: rgba(255, 255, 255, 0.75);
  backdrop-filter: blur(0px);
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
}

/* 햄버거 버튼 (국기 오른쪽 끝) */
.header .btn_menu {
  min-width: 17px;
  height: 15px;
  position: relative;
  order: 5;
}

.header .btn_menu a {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  height: 100%;
}

/* navbar sub menu */
.nav_sub_menu {
  max-width: 1920px;
  margin: 0 auto;
  width: 100%;
  height: 100vh;
  background-color: #fff;
  padding: 100px 80px 200px;
  flex-wrap: wrap;
  gap: 80px;
  display: none;
  position: absolute;
  inset: 0;
  overflow-y: auto;
}

/* aside 형태의 nav_sub_menu 스타일 */
.nav_sub_menu {
  max-width: 1920px;
  margin: 0 auto;
  width: 100%;
  height: 100vh;
  background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
  padding: 0;
  display: none;
  position: absolute;
  inset: 0;
  overflow-y: auto;
  z-index: 1000;
}

/* 1068 이하: 화면 밖으로 밀어 두고 visibility 를 늦게 감춰 닫을 때도 전환이 걸리게 한다 */
@media (max-width: 1068px) {
  .nav_sub_menu {
    left: auto;   /* inset:0 이 left 를 붙잡아 width 가 안 먹는다 */
    right: 0;
    width: 75%;
    display: block;
    transform: translateX(100%);
    visibility: hidden;
    transition: transform 0.3s ease-in-out, visibility 0s linear 0.3s;
  }
  .nav_sub_menu.active {
    transform: translateX(0);
    visibility: visible;
    animation: none;
    transition: transform 0.3s ease-in-out, visibility 0s;
  }
}

.hamburger-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.hamburger-overlay.active {
  opacity: 1;
  visibility: visible;
}

/* 서브메뉴 헤더 */
.nav_sub_menu .submenu-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 30px 80px 20px;
  background-color: rgba(255, 255, 255, 0.75);
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav_sub_menu .submenu-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
}

.nav_sub_menu .submenu-close:hover {
  background: rgba(0, 0, 0, 0.05);
  transform: scale(1.1);
}

.nav_sub_menu .submenu-close span {
  font-size: 24px;
  color: #666;
  transition: color 0.3s ease;
}

.nav_sub_menu .submenu-close:hover span {
  color: var(--point-color-hover);
}

.nav_sub_menu .submenu-container {
  display: flex;
  flex-wrap: wrap;
  gap: 80px;
  max-width: 1600px;
  margin: 0 auto;
  padding: 60px 80px 200px;
}

.nav_sub_menu .submenu-section {
  flex: 1;
  min-width: 250px;
  max-width: 300px;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 16px;
  padding: 30px 25px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  border: 1px solid rgba(0, 0, 0, 0.05);
  transition: all 0.3s ease;
  overflow: hidden;
}

.nav_sub_menu .submenu-section:hover {
  /* transform: translateY(-4px); */
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.12);
  background: rgba(255, 255, 255, 0.95);
}

.nav_sub_menu .submenu-section h3,
.nav_sub_menu .submenu-section .submenu-title {
  font-weight: 700;
  font-size: 18px;
  color: #1d1d1f;
  margin-bottom: 35px;
  position: relative;
  padding-bottom: 15px;
}

.nav_sub_menu .submenu-section h3::after,
.nav_sub_menu .submenu-section .submenu-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 40px;
  height: 3px;
  background: linear-gradient(90deg, var(--point-color-hover) 0%, rgba(255, 255, 255, 0) 100%);
  border-radius: 2px;
  transition: width 0.3s ease;
}

.nav_sub_menu .submenu-section:hover h3::after,
.nav_sub_menu .submenu-section:hover .submenu-title::after {
  width: 60px;
}

.nav_sub_menu .submenu-section ul li {
  margin: 0;
  padding: 0;
  margin-bottom: 15px;
  position: relative;
}

.nav_sub_menu .submenu-section ul li a {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #666;
  text-decoration: none;
  font-size: 18px;
  transition: all 0.3s ease;
  position: relative;
  padding: 12px 16px;
  border-radius: 8px;
  background: transparent;
  border-left: 3px solid transparent;
}

.nav_sub_menu .submenu-section ul li a::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--point-color-hover) 0%, rgba(255, 255, 255, 0) 100%);
  transition: width 0.3s ease;
  opacity: 0.1;
  border-radius: 8px 0 0 8px;
}

.nav_sub_menu .submenu-section ul li a:hover {
  color: var(--point-color-hover);
  background: rgba(248, 249, 250, 0.8);
  border-left: 3px solid var(--point-color-hover);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.nav_sub_menu .submenu-section ul li a:hover::before {
  width: 100%;
}

.nav_sub_menu .submenu-section ul li a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--point-color-hover) 0%, rgba(255, 255, 255, 0) 100%);
  transition: width 0.3s ease;
}

.nav_sub_menu .submenu-section ul li a:hover::after {
  width: 100%;
}

body:has(.nav_sub_menu.active) {
  overflow: hidden;
}

.nav_sub_menu ul {
  margin: 0 20px;
}

.nav_sub_menu ul li {
  color: #999999;
  margin-top: 15px;
}

.nav_sub_menu ul li a {
  position: relative;
  display: inline-block;
}

.nav_sub_menu ul li a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  width: 0;
  height: 2px;
  background-color: var(--point-color-hover);
  transition: all 0.3s ease;
  transform: translateX(-50%);
}

.nav_sub_menu ul li a:hover {
  color: var(--point-color-hover);
}

.nav_sub_menu ul li a:hover::after {
  width: 100%;
}

@media (max-width: 1240px) {
  .header .inner {
    padding: 20px 40px 0;
  }
  .nav_sub_menu .submenu-header {
    padding: 25px 40px 15px;
  }
  .nav_sub_menu .submenu-section h3,
.nav_sub_menu .submenu-section .submenu-title {
    font-size: 17px;
    margin-bottom: 30px;
  }
  .nav_sub_menu .submenu-section ul li a {
    font-size: 17px;
    padding: 10px 14px;
  }
}

@media (max-width: 768px) {
  html, body {
    overflow-x: hidden;
  }

  .header .inner {
    padding: 20px 16px 0;
    background-color: #fff;
  }

  /* 네비게이션 서브메뉴 모바일 스타일 */
  .nav_sub_menu {
    padding: 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
  }
  .nav_sub_menu .submenu-header {
    padding: 10px 16px 15px;
  }
  .nav_sub_menu .submenu-close {
    width: 36px;
    height: 36px;
  }
  .nav_sub_menu .submenu-close span {
    font-size: 20px;
  }
  .nav_sub_menu .submenu-container {
    flex-direction: column;
    gap: 30px;
    padding: 40px 16px 100px;
  }
  .nav_sub_menu .submenu-section {
    min-width: auto;
    max-width: none;
    padding: 20px 16px;
    border-radius: 12px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  }
  .nav_sub_menu .submenu-section:hover {
    /* transform: translateY(-2px); */
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  }
  .nav_sub_menu .submenu-section h3,
.nav_sub_menu .submenu-section .submenu-title {
    font-size: 16px;
    margin-bottom: 20px;
    padding-bottom: 12px;
  }
  .nav_sub_menu .submenu-section h3::after,
.nav_sub_menu .submenu-section .submenu-title::after {
    width: 30px;
    height: 2px;
  }
  .nav_sub_menu .submenu-section:hover h3::after,
.nav_sub_menu .submenu-section:hover .submenu-title::after {
    width: 40px;
  }
  .nav_sub_menu .submenu-section ul li {
    margin-bottom: 8px;
  }
  .nav_sub_menu .submenu-section ul li a {
    font-size: 17px;
    padding: 10px 12px;
    border-radius: 6px;
  }
  .nav_sub_menu .submenu-section ul li a:hover {
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  }
  .header .btn_menu a.active {
    top: 50px;
  }
}