/* ===================================
   Header Styles
   의존: common.css (디자인 시스템 변수, 리셋, 아이콘 유틸리티)
   =================================== */

/* ===================================
   Header
   =================================== */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.header-container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-10);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 80px;
}

/* ===================================
   Logo
   =================================== */
.header-logo {
  flex-shrink: 0;
}

.logo-link {
  display: block;
}

.logo-image {
  height: 28px;
  width: auto;
  max-width: 100%;
  object-fit: contain;
  display: block;
  transition: opacity 0.2s ease;
}

.logo-image--white {
  display: none;
}

/* 의생명연구원(bri 그룹: 국문+영문) 로고만 살짝 크게 — 2026-07-22. 기본 28px → 34px. 타 사이트 무영향 */
.logo-image--bri {
  height: 34px;
}

.logo-link:hover .logo-image {
  opacity: 0.8;
}

/* ===================================
   GNB (Global Navigation Bar)
   =================================== */
.gnb {
  flex: 1;
  margin: 0 var(--space-8);
}

.gnb-list {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
}

.gnb-item {
  position: relative;
}

/* GNB 1Depth Links - Tab menu style (18px/700) */
.gnb-link {
  display: block;
  font-size: var(--fs-block);
  font-weight: var(--fw-bold);
  color: var(--color-text-primary);
  padding: 28px 0;
  white-space: nowrap;
  position: relative;
  transition: color 0.2s ease;
}

.gnb-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 6px;
  background-color: var(--color-primary-900);
  transition: width 0.3s ease;
  z-index: 2;
}

.gnb-item:hover .gnb-link::after,
.gnb-item.is-active .gnb-link::after {
  width: 100%;
}

.gnb-item:hover .gnb-link,
.gnb-item.is-active .gnb-link {
  color: var(--color-primary-900);
}

/* ===================================
   GNB Mega Menu
   =================================== */
.gnb-megamenu {
  position: absolute;
  top: 100%;
  left: 0;
  width: 100%;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  pointer-events: none;
}

.gnb:hover .gnb-megamenu {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* 메가메뉴 배경 */
.megamenu-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.05);
  backdrop-filter: blur(2px);
}

/* 메가메뉴 콘텐츠 영역 */
.megamenu-content {
  position: relative;
  background-color: var(--color-white);
  border-top: 1px solid var(--color-border);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  padding: var(--space-10) 0;
  max-height: 80vh;
  overflow-y: auto;
}

.megamenu-inner {
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-10);
}

/* 메가메뉴 섹션 (각 1Depth별) */
.megamenu-section {
  display: none;
  flex-direction: column;
  gap: 0;
}

/* 섹션 제목 - 일반 모드에서는 숨김 */
.megamenu-section-title {
  display: none;
  font-size: var(--fs-block);
  font-weight: var(--fw-bold);
  line-height: 1.2;
  letter-spacing: var(--ls);
  color: var(--color-text-primary);
  padding: var(--space-5) 0;
  cursor: pointer;
  transition: color 0.2s ease;
}

.megamenu-section-title:hover {
  color: var(--color-primary-900);
}

/* Row 구조 (2Depth) */
.megamenu-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-10);
  padding: 18px 0;
  border-bottom: 1px solid var(--color-gray-100);
}

.megamenu-row:first-child {
  padding-top: 0;
}

.megamenu-row:last-child {
  border-bottom: none;
}

/* 2Depth 카테고리 버튼 - 18px/600/lh1.4/ls-0.05em */
.megamenu-category-btn {
  flex-shrink: 0;
  width: 200px;
  padding: var(--space-2) var(--space-3);
  font-size: var(--fs-body);
  font-weight: var(--fw-semibold);
  line-height: 1.2;
  letter-spacing: var(--ls);
  color: var(--color-text-primary);
  text-align: left;
  background-color: transparent;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.megamenu-category-btn::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 0;
  background-color: var(--color-primary-900);
  border-radius: var(--radius-sm);
  transition: height 0.2s ease;
}

.megamenu-category-btn:hover {
  color: var(--color-primary-900);
  background-color: var(--color-surface);
}

.megamenu-category-btn:hover::before {
  height: 60%;
}

/* 3Depth 링크 영역 */
.megamenu-links {
  flex: 1;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-5);
  align-items: flex-start;
  padding: 0;
}

/* 3Depth 링크 - 16px/400/lh1.45~1.55/ls-0.05em */
.megamenu-links a {
  display: inline-block;
  padding: var(--space-2) 10px;
  font-size: var(--fs-body);
  font-weight: var(--fw-regular);
  line-height: 1.5;
  letter-spacing: var(--ls);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all 0.2s ease;
  white-space: nowrap;
  position: relative;
}

.megamenu-links a::after {
  content: '';
  position: absolute;
  bottom: 6px;
  left: 10px;
  right: 10px;
  height: 1px;
  background-color: var(--color-primary-900);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.2s ease;
}

.megamenu-links a:hover {
  color: var(--color-primary-900);
}

.megamenu-links a:hover::after {
  transform: scaleX(1);
}

.megamenu-links a.active {
  color: var(--color-white);
  background-color: var(--color-primary-900);
  font-weight: var(--fw-medium);
}

/* 메가메뉴 스크롤바 */
.megamenu-content::-webkit-scrollbar {
  width: 8px;
}

.megamenu-content::-webkit-scrollbar-track {
  background: var(--color-gray-100);
}

.megamenu-content::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
  border-radius: var(--radius-sm);
}

.megamenu-content::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-500);
}

/* ===================================
   전체 메뉴 모드 (show-all)
   =================================== */
.gnb-megamenu.show-all {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.gnb-megamenu.show-all .megamenu-backdrop {
  position: fixed;
  top: 120px;
  left: 0;
  width: 100vw;
  height: calc(100vh - 120px);
  background-color: rgba(0, 0, 0, 0.5);
  z-index: 998;
}

.gnb-megamenu.show-all .megamenu-content {
  position: fixed;
  top: 120px;
  left: 0;
  width: 100%;
  height: calc(100vh - 120px);
  max-height: calc(100vh - 120px);
  z-index: 999;
}

.gnb-megamenu.show-all .megamenu-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  align-items: start;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 var(--space-10);
}

.gnb-megamenu.show-all .megamenu-section {
  display: flex !important;
  border-bottom: 1px solid rgba(229, 231, 235, 0.5);
}

.gnb-megamenu.show-all .megamenu-section:last-child {
  border-bottom: none;
}

/* 전체 메뉴 모드에서는 제목만 표시 */
.gnb-megamenu.show-all .megamenu-section-title {
  display: block;
  position: relative;
  padding-right: 28px;
}

.gnb-megamenu.show-all .megamenu-section-title::after {
  content: '';
  position: absolute;
  right: 8px;
  top: 50%;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--color-text-primary);
  border-bottom: 2px solid var(--color-text-primary);
  transform: translateY(-50%) rotate(45deg);
  transition: transform 0.3s ease;
}

.gnb-megamenu.show-all .megamenu-section.active .megamenu-section-title::after {
  transform: translateY(-50%) rotate(-135deg);
}

.gnb-megamenu.show-all .megamenu-row {
  display: none;
}

.gnb-megamenu.show-all .megamenu-section.active .megamenu-row {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0;
  background-color: var(--color-gray-100);
  margin: 0 -40px;
  padding: 0 var(--space-10);
  border-bottom: none;
}

.gnb-megamenu.show-all .megamenu-section.active .megamenu-row:last-child {
  padding-bottom: 0;
}

/* 2뎁스: 아코디언 버튼 */
.gnb-megamenu.show-all .megamenu-category-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px 18px var(--space-3);
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  position: relative;
  border-bottom: 1px solid rgba(229, 231, 235, 0.5);
}

.gnb-megamenu.show-all .megamenu-category-btn::before {
  display: none;
}

.gnb-megamenu.show-all .megamenu-category-btn::after {
  content: '';
  position: absolute;
  right: 8px;
  top: 50%;
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--color-gray-500);
  border-bottom: 2px solid var(--color-gray-500);
  transform: translateY(-50%) rotate(45deg);
  transition: transform 0.3s ease;
}

/* 3뎁스(하위)가 없는 링크형 2뎁스(<a>)는 chevron(V) 미노출 — 클릭 시 바로 페이지 이동 (2026-07-31) */
.gnb-megamenu.show-all a.megamenu-category-btn::after {
  display: none;
}

.gnb-megamenu.show-all .megamenu-row.active .megamenu-category-btn {
  color: var(--color-primary-900);
  font-weight: var(--fw-semibold);
}

.gnb-megamenu.show-all .megamenu-row.active .megamenu-category-btn::after {
  border-color: var(--color-primary-900);
  transform: translateY(-50%) rotate(-135deg);
}

/* 3뎁스: 기본 숨김, 2뎁스 active 시 노출 */
.gnb-megamenu.show-all .megamenu-links {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  flex-direction: column;
  flex-wrap: nowrap;
  gap: 0;
}

.gnb-megamenu.show-all .megamenu-row.active .megamenu-links {
  display: flex;
  flex-direction: column;
  flex: none;
  width: 100%;
  padding: var(--space-2) 0 var(--space-3) 0;
  gap: 0;
}

.gnb-megamenu.show-all .megamenu-row.active .megamenu-links a {
  display: block;
  padding: 10px var(--space-3);
  font-size: var(--fs-small);
  white-space: normal;
}

/* ===================================
   Header Utilities
   =================================== */
.header-utils {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

/* Language Selector */
.lang-selector {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.btn-lang {
  font-size: var(--fs-block);
  font-weight: var(--fw-medium);
  color: var(--color-gray-600);
  padding: var(--space-2) var(--space-1);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  transition: all 0.2s ease;
  letter-spacing: 0;
}

.btn-lang.active {
  color: var(--color-primary-900);
  font-weight: var(--fw-semibold);
}

.btn-lang:hover {
  color: var(--color-primary-700);
}

.lang-divider {
  color: var(--color-gray-300);
  font-size: var(--fs-small);
}

.btn-search {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  color: var(--color-text-primary);
  transition: all 0.2s ease;
  position: relative;
}

.btn-menu {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  transition: all 0.2s ease;
  position: relative;
}

.btn-menu:hover {
  background-color: var(--color-surface);
}

.btn-search:hover {
  background-color: var(--color-surface);
  color: var(--color-primary-900);
}

.btn-search:active {
  background-color: var(--color-primary-100);
}

/* 햄버거/닫기 아이콘 전환 */
.btn-menu .icon-hamburger {
  display: block;
}

.btn-menu .icon-close {
  display: none;
}

.btn-menu.menu-open .icon-hamburger {
  display: none;
}

.btn-menu.menu-open .icon-close {
  display: block;
}

/* ===================================
   Main Content (Sample)
   =================================== */
.main-content {
  padding: var(--space-20) var(--space-10);
}

.main-content h1 {
  font-size: var(--fs-hero);
  font-weight: var(--fw-bold);
  line-height: 1.2;
  color: var(--color-text-primary);
  margin-bottom: var(--space-5);
}

.main-content p {
  font-size: var(--fs-body);
  line-height: 1.6;
  color: var(--color-text-secondary);
}

/* ===================================
   Responsive Design
   Desktop Large: 1440px+
   Desktop: 1200px ~ 1439px
   Tablet: 768px ~ 1199px
   Mobile: 0 ~ 767px
   =================================== */

/* Desktop: 1200px ~ 1439px */
@media (max-width: 1439px) {
  .gnb-list {
    gap: var(--space-5);
  }

  .gnb-link {
    font-size: var(--fs-block);
  }

  .gnb {
    margin: 0 var(--space-12);
  }
}

/* Desktop Small / Tablet: ~ 1199px */
@media (max-width: 1023px) {
  .logo-image {
    height: 26px;
  }

  .logo-image--bri {
    height: 30px;
  }

  /* GNB: 가로 메뉴 → 햄버거로 전환 */
  .gnb {
    flex: 0 0 0;
    margin: 0;
  }

  .gnb-list {
    display: none;
  }

  .btn-menu {
    display: flex !important;
    align-items: center;
    justify-content: center;
  }

  /* 메가메뉴 hover 비활성 (show-all 모드에서는 제외) */
  .gnb:hover .gnb-megamenu:not(.show-all) {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
  }

  .megamenu-inner {
    padding: 0 var(--space-6);
  }

  .megamenu-category-btn {
    width: 180px;
    font-size: var(--fs-body);
  }

  .megamenu-links {
    gap: var(--space-2) 18px;
  }

  .megamenu-links a {
    font-size: var(--fs-small);
  }

  .megamenu-row {
    gap: 36px;
    padding: var(--space-4) 0;
  }

  /* 전체 메뉴 모드 반응형 */
  .gnb-megamenu.show-all .megamenu-inner {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 0 var(--space-8);
  }

  .gnb-megamenu.show-all .megamenu-section.active .megamenu-row {
    margin: 0 -32px;
    padding: 0 var(--space-8);
  }
}

/* Mobile: ~ 767px */
@media (max-width: 767px) {
  .header-container {
    padding: 0 var(--space-6);
    justify-content: space-between;
    height: 64px;
  }

  .header-logo {
    max-width: 160px;
  }

  .logo-image {
    height: 24px;
    max-width: 160px;
  }

  .logo-image--bri {
    height: 28px;
    max-width: 160px;
  }

  /* 모바일 헤더(64px) + 유틸리티바(36px) = 100px 기준 메가메뉴 위치 조정 */
  .gnb-megamenu.show-all .megamenu-backdrop {
    top: 100px;
    height: calc(100vh - 100px);
  }

  .gnb-megamenu.show-all .megamenu-content {
    top: 100px;
    height: calc(100vh - 100px);
    max-height: calc(100vh - 100px);
  }

  .gnb-megamenu.show-all .megamenu-inner {
    padding: 0 var(--space-6);
  }

  .header-utils {
    gap: var(--space-2);
  }

  .lang-selector {
    gap: var(--space-2);
  }

  .btn-lang {
    font-size: var(--fs-small);
    padding: 6px 2px;
  }

  .btn-search,
  .btn-menu {
    width: 40px;
    height: 40px;
  }

  /* 전체 메뉴 모바일 반응형 */
  .gnb-megamenu.show-all .megamenu-inner {
    padding: 0 var(--space-6);
  }

  .gnb-megamenu.show-all .megamenu-section.active .megamenu-row {
    margin: 0 -24px;
    padding: 0 var(--space-6);
  }
}

/* ===================================
   Full Menu Overlay
   =================================== */
.fullmenu-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.95);
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.4s ease;
  overflow-y: auto;
}

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

.fullmenu-container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 60px var(--space-10);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Full Menu Header */
.fullmenu-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--gap-layout-section-compact);
  padding-bottom: 30px;
  border-bottom: 2px solid rgba(255, 255, 255, 0.2);
}

.fullmenu-title {
  font-size: var(--fs-title-lg);
  font-weight: var(--fw-bold);
  color: var(--color-white);
  letter-spacing: var(--ls-tight);
}

.btn-close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  border-radius: var(--radius-full);
  color: var(--color-white);
  background-color: rgba(255, 255, 255, 0.1);
  transition: all 0.2s ease;
}

.btn-close:hover {
  background-color: rgba(255, 255, 255, 0.2);
  transform: rotate(90deg);
}

/* Full Menu Content Grid */
.fullmenu-content {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 60px;
  flex: 1;
}

.fullmenu-column {
  display: flex;
  flex-direction: column;
}

.fullmenu-column-title {
  font-size: var(--fs-block);
  font-weight: var(--fw-semibold);
  color: var(--color-primary-500);
  margin-bottom: var(--space-6);
  padding-bottom: var(--space-4);
  border-bottom: 1px solid rgba(255, 255, 255, 0.15);
  letter-spacing: var(--ls-tight);
}

.fullmenu-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.fullmenu-list a {
  font-size: var(--fs-small);
  font-weight: var(--fw-regular);
  color: rgba(255, 255, 255, 0.8);
  padding: var(--space-3) 0;
  transition: all 0.2s ease;
  letter-spacing: var(--ls-tight);
  line-height: 1.5;
}

.fullmenu-list a:hover {
  color: var(--color-white);
  padding-left: var(--space-2);
}

/* Full Menu Responsive */
@media (max-width: 1023px) {
  .fullmenu-content {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-10);
  }
}

@media (max-width: 767px) {
  .fullmenu-container {
    padding: var(--space-10) var(--space-6);
  }

  .fullmenu-header {
    margin-bottom: var(--gap-layout-page-header);
    padding-bottom: var(--space-5);
  }

  .fullmenu-title {
    font-size: var(--fs-title-sm);
  }

  .fullmenu-content {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
  }

  .fullmenu-column-title {
    font-size: var(--fs-body);
    margin-bottom: var(--space-4);
    padding-bottom: var(--space-3);
  }

  .fullmenu-list a {
    font-size: var(--fs-small);
    padding: var(--space-2) 0;
  }
}

@media (max-width: 479px) {
  .fullmenu-content {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .btn-close {
    width: 44px;
    height: 44px;
  }
}

/* ===================================
   External Link Icon
   GNB 메가메뉴·LNB에서 target="_blank" 항목에 자동 삽입되는 아이콘
   - mask-image 방식: currentColor 상속으로 hover/active 색상 자동 추종
   - 14px: GNB(18px) 기준 78%, LNB item(16px) 기준 87%
   =================================== */
.icon-external {
  display: inline-block;
  width: 16px;
  height: 16px;
  margin-left: var(--space-1);
  vertical-align: -2px;
  opacity: 0.75;
  flex-shrink: 0;
  pointer-events: none;
}