/* ============================================================
   EILAP - Header / Navigation
   ============================================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--nav-height);
  z-index: 1000;
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
}
.site-header.scrolled {
  border-color: var(--gray-200);
  box-shadow: 0 2px 20px rgba(24,57,136,.08);
}
.site-header.dark-nav {
  background: transparent;
  border-bottom-color: rgba(255,255,255,.1);
}
.site-header.dark-nav .nav-logo-text,
.site-header.dark-nav .nav-link { color: rgba(255,255,255,.9); }
.site-header.dark-nav .nav-link:hover { color: var(--white); }
.site-header.dark-nav.scrolled {
  background: rgba(24,57,136,.97);
  border-color: rgba(255,255,255,.1);
}

.nav-wrap {
  display: flex;
  align-items: center;
  height: var(--nav-height);
}

/* ── Logo ── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.nav-logo-icon {
  width: auto;
  height: 56px;
  max-width: 160px;
  flex-shrink: 0;
  object-fit: contain;
}
.nav-logo-text {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.02em;
}
.nav-logo-text span { color: var(--accent2); }

/* ── Desktop Nav Menu ──
   헤더 밖에 위치하지만 데스크톱에서는 헤더 우측에 보이도록
── */
.nav-menu {
  /* 데스크톱: 헤더 우측에 고정 배치 */
  position: fixed;
  top: 0;
  right: max(calc((100vw - 1200px) / 2), 20px);
  height: var(--nav-height);
  display: flex;
  align-items: center;
  gap: 4px;
  z-index: 1001;
  background: transparent;
  pointer-events: auto;
}
.nav-link {
  display: block;
  padding: 8px 16px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--gray-700);
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  white-space: nowrap;
  text-decoration: none;
}
.nav-link:hover { color: var(--primary); background: rgba(24,57,136,.05); }
.nav-link.active { color: var(--primary); font-weight: 700; }

/* ── Admin Link (desktop) ── */
.nav-admin-btn {
  padding: 8px 18px !important;
  background: var(--primary) !important;
  color: var(--white) !important;
  border-radius: var(--radius-sm) !important;
  font-size: 0.875rem !important;
  font-weight: 600 !important;
  margin-left: 8px;
}
.nav-admin-btn:hover { background: var(--accent2) !important; }

/* ── Hamburger Button ── */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 8px;
  margin-left: auto;
  border-radius: var(--radius-sm);
  background: transparent;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
  -webkit-tap-highlight-color: transparent;
  transition: background var(--transition);
}
.nav-toggle:hover { background: rgba(24,57,136,.06); }
.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--gray-700);
  border-radius: 2px;
  transition: transform 0.3s ease, opacity 0.3s ease;
  transform-origin: center;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ── Dim Overlay ──
   backdrop-filter 절대 사용 금지:
   backdrop-filter는 새 stacking context를 생성하여
   형제의 z-index를 무력화시킴
── */
.nav-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 1100;
}
.nav-overlay.open { display: block; }

/* ── Mobile ── */
@media (max-width: 900px) {
  /* 데스크톱 스타일 초기화 */
  .nav-menu {
    position: fixed;
    top: 0;
    left: auto;
    right: -320px;
    transform: none;
    width: 300px;
    height: 100%;
    background: #ffffff;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0;
    border-left: 1px solid #dee2e6;
    box-shadow: -6px 0 40px rgba(0, 0, 0, 0.25);
    transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1200;   /* overlay(1100) 보다 위 */
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  .nav-menu.open { right: 0; }

  /* 메뉴 패널 상단 타이틀 */
  .nav-menu::before {
    content: 'MENU';
    display: block;
    height: 56px;
    line-height: 56px;
    padding: 0 24px;
    font-size: 0.75rem;
    font-weight: 800;
    letter-spacing: 0.15em;
    color: #183988;
    background: #f8f9fa;
    border-bottom: 2px solid #183988;
    flex-shrink: 0;
  }

  /* 메뉴 링크 공통 */
  .nav-link {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 17px 24px;
    font-size: 1rem;
    font-weight: 500;
    color: #343a40;
    border-radius: 0;
    background: #ffffff;
    border-bottom: 1px solid #f1f3f5;
    white-space: normal;
    transition: background 0.2s, color 0.2s, padding-left 0.2s;
  }
  .nav-link:hover {
    background: #eef2ff;
    color: #183988;
    padding-left: 32px;
  }
  .nav-link.active {
    color: #183988;
    font-weight: 700;
    background: #eef2ff;
    border-left: 3px solid #183988;
    padding-left: 21px;
  }

  /* 관리자 버튼 (모바일) */
  .nav-admin-btn {
    display: flex !important;
    align-items: center !important;
    justify-content: center !important;
    margin: 16px !important;
    width: calc(100% - 32px) !important;
    padding: 14px 24px !important;
    background: #183988 !important;
    color: #ffffff !important;
    border-radius: 6px !important;
    font-size: 0.9375rem !important;
    font-weight: 700 !important;
    border-bottom: none !important;
    border-left: none !important;
  }
  .nav-admin-btn:hover {
    background: #02A593 !important;
    padding-left: 24px !important;
  }
  .nav-admin-btn.active {
    background: #02A593 !important;
    border-left: none !important;
    padding-left: 24px !important;
  }

  /* 햄버거 표시 */
  .nav-toggle { display: flex; }
  .site-header.dark-nav .nav-toggle span { background: #ffffff; }
  .site-header.dark-nav.scrolled .nav-toggle span { background: #ffffff; }
}

@media (max-width: 480px) {
  .nav-menu {
    width: 280px;
    right: -300px;
  }
}