/* 메인 네비게이션 컨테이너 */
.site-nav {
  margin-top: 12px;
  padding: 8px;
  background: linear-gradient(135deg, 
    rgba(255, 255, 255, 0.9) 0%, 
    rgba(248, 250, 252, 0.8) 100%);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-radius: 24px;
  border: 1px solid rgba(226, 232, 240, 0.6);
  box-shadow: 
    0 8px 32px rgba(0, 0, 0, 0.08),
    0 2px 8px rgba(0, 0, 0, 0.04),
    inset 0 1px 0 rgba(255, 255, 255, 0.8);
}

/* 네비게이션 루트 */
.nav-root {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  align-items: center;
}

/* 네비게이션 아이템 */
.nav-item {
  position: relative;
}

.nav-item > a {
  display: inline-flex;
  align-items: center;
  padding: 10px 18px;
  border: 1px solid transparent;
  border-radius: 999px;
  background: linear-gradient(135deg, 
    rgba(255, 255, 255, 0.8) 0%, 
    rgba(248, 250, 252, 0.6) 100%);
  color: #475569;
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  line-height: 1.2;
  letter-spacing: -0.01em;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* 호버 효과를 위한 배경 레이어 */
.nav-item > a::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, 
    rgba(59, 130, 246, 0.1) 0%, 
    rgba(37, 99, 235, 0.05) 100%);
  opacity: 0;
  transition: opacity 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  border-radius: 999px;
}

/* 호버 상태 */
.nav-item > a:hover {
  background: linear-gradient(135deg, 
    rgba(255, 255, 255, 0.95) 0%, 
    rgba(248, 250, 252, 0.9) 100%);
  border-color: rgba(59, 130, 246, 0.2);
  color: #1e40af;
  transform: translateY(-2px) scale(1.02);
  box-shadow: 
    0 12px 24px rgba(59, 130, 246, 0.15),
    0 4px 12px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 1);
}

.nav-item > a:hover::before {
  opacity: 1;
}

/* 활성 상태 */
.nav-item.is-active > a {
  background: linear-gradient(135deg, 
    rgba(59, 130, 246, 0.95) 0%, 
    rgba(37, 99, 235, 0.9) 100%);
  border-color: rgba(29, 78, 216, 0.3);
  color: white;
  font-weight: 600;
  box-shadow: 
    0 8px 20px rgba(59, 130, 246, 0.4),
    0 4px 12px rgba(0, 0, 0, 0.15),
    inset 0 1px 0 rgba(255, 255, 255, 0.2),
    0 0 0 1px rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
}

.nav-item.is-active > a::before {
  opacity: 1;
  background: linear-gradient(135deg, 
    rgba(255, 255, 255, 0.15) 0%, 
    rgba(255, 255, 255, 0.05) 100%);
}

.nav-item.is-active > a:hover {
  background: linear-gradient(135deg, 
    rgba(59, 130, 246, 1) 0%, 
    rgba(37, 99, 235, 0.95) 100%);
  transform: translateY(-2px) scale(1.02);
  box-shadow: 
    0 12px 28px rgba(59, 130, 246, 0.5),
    0 6px 16px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

/* 드롭다운 서브메뉴 */
.nav-sub {
  display: none;
  position: absolute;
  left: 0;
  top: calc(100% + 12px);
  min-width: 220px;
  background: linear-gradient(135deg, 
    rgba(255, 255, 255, 0.98) 0%, 
    rgba(248, 250, 252, 0.95) 100%);
  border: 1px solid rgba(226, 232, 240, 0.6);
  border-radius: 20px;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: 
    0 24px 48px rgba(0, 0, 0, 0.12),
    0 12px 24px rgba(0, 0, 0, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.9),
    0 0 0 1px rgba(255, 255, 255, 0.1);
  padding: 12px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-12px) scale(0.96);
  transition: all 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: 1000;
}

/* 드롭다운 화살표 */
.nav-sub::before {
  content: '';
  position: absolute;
  top: -6px;
  left: 24px;
  width: 12px;
  height: 12px;
  background: linear-gradient(135deg, 
    rgba(255, 255, 255, 0.98) 0%, 
    rgba(248, 250, 252, 0.95) 100%);
  border: 1px solid rgba(226, 232, 240, 0.6);
  border-bottom: none;
  border-right: none;
  transform: rotate(45deg);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
}

/* 드롭다운 호버 시 표시 */
.nav-item:hover > .nav-sub {
  display: block;
  opacity: 1;
  visibility: visible;
  transform: translateY(0) scale(1);
}

/* 서브메뉴 아이템 */
.nav-sub .nav-item {
  margin: 0;
}

.nav-sub .nav-item > a {
  display: flex;
  align-items: center;
  border-radius: 16px;
  padding: 12px 16px;
  background: transparent;
  border: 1px solid transparent;
  margin: 3px 0;
  font-weight: 500;
  font-size: 14px;
  color: #64748b;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  transform: none;
  backdrop-filter: none;
  position: relative;
  overflow: hidden;
}

.nav-sub .nav-item > a::before {
  opacity: 0;
  background: linear-gradient(135deg, 
    rgba(59, 130, 246, 0.08) 0%, 
    rgba(37, 99, 235, 0.04) 100%);
}

.nav-sub .nav-item > a:hover {
  background: linear-gradient(135deg, 
    rgba(59, 130, 246, 0.1) 0%, 
    rgba(37, 99, 235, 0.05) 100%);
  border-color: rgba(59, 130, 246, 0.2);
  color: #1e40af;
  transform: translateX(4px) scale(1.02);
  box-shadow: 
    0 6px 16px rgba(59, 130, 246, 0.12),
    0 2px 8px rgba(0, 0, 0, 0.08),
    inset 0 1px 0 rgba(255, 255, 255, 0.9);
}

.nav-sub .nav-item > a:hover::before {
  opacity: 1;
}

/* 서브메뉴 아이템에 아이콘 추가 */
.nav-sub .nav-item > a::after {
  content: '→';
  opacity: 0;
  margin-left: auto;
  font-size: 12px;
  color: #3b82f6;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  transform: translateX(-8px);
}

.nav-sub .nav-item > a:hover::after {
  opacity: 1;
  transform: translateX(0);
}

/* 접근성을 위한 포커스 스타일 */
.nav-item > a:focus {
  outline: none;
  box-shadow: 
    0 0 0 3px rgba(59, 130, 246, 0.4),
    0 8px 20px rgba(59, 130, 246, 0.15);
}

.nav-sub .nav-item > a:focus {
  outline: none;
  box-shadow: 
    0 0 0 2px rgba(59, 130, 246, 0.4),
    0 4px 12px rgba(59, 130, 246, 0.15);
}

/* 로딩/애니메이션 효과 */
@keyframes pillGlow {
  0%, 100% { box-shadow: 0 0 5px rgba(59, 130, 246, 0.3); }
  50% { box-shadow: 0 0 20px rgba(59, 130, 246, 0.6); }
}

.nav-item.is-loading > a {
  animation: pillGlow 2s ease-in-out infinite;
}

/* 스크롤 인디케이터 */
.nav-root::before,
.nav-root::after {
  content: '';
  position: sticky;
  z-index: 1;
  width: 20px;
  flex-shrink: 0;
}

/* 반응형 디자인 */
@media (max-width: 768px) {
  .site-nav {
    margin-top: 8px;
    padding: 6px;
    border-radius: 20px;
  }
  
  .nav-root {
    gap: 4px;
    overflow-x: auto;
    scrollbar-width: none;
    -ms-overflow-style: none;
    padding: 0 4px;
  }
  
  .nav-root::-webkit-scrollbar {
    display: none;
  }
  
  .nav-item > a {
    padding: 8px 14px;
    font-size: 13px;
    white-space: nowrap;
  }
  
  .nav-sub {
    min-width: 200px;
    left: 50%;
    transform: translateX(-50%) translateY(-12px) scale(0.96);
    border-radius: 16px;
  }
  
  .nav-item:hover > .nav-sub {
    transform: translateX(-50%) translateY(0) scale(1);
  }
  
  .nav-sub .nav-item > a {
    padding: 10px 14px;
    border-radius: 12px;
  }
}

/* 더 작은 화면 */
@media (max-width: 480px) {
  .nav-item > a {
    padding: 6px 12px;
    font-size: 12px;
  }
  
  .nav-sub {
    min-width: 180px;
  }
}

/* 다크모드 지원 */
@media (prefers-color-scheme: dark) {
  .site-nav {
    background: linear-gradient(135deg, 
      rgba(15, 23, 42, 0.9) 0%, 
      rgba(30, 41, 59, 0.8) 100%);
    border-color: rgba(51, 65, 85, 0.6);
  }
  
  .nav-item > a {
    background: linear-gradient(135deg, 
      rgba(51, 65, 85, 0.8) 0%, 
      rgba(71, 85, 105, 0.6) 100%);
    color: #cbd5e1;
  }
  
  .nav-item > a:hover {
    background: linear-gradient(135deg, 
      rgba(51, 65, 85, 0.95) 0%, 
      rgba(71, 85, 105, 0.9) 100%);
    border-color: rgba(59, 130, 246, 0.4);
    color: #93c5fd;
  }
  
  .nav-item.is-active > a {
    background: linear-gradient(135deg, 
      rgba(59, 130, 246, 0.9) 0%, 
      rgba(37, 99, 235, 0.8) 100%);
    color: white;
  }
  
  .nav-sub {
    background: linear-gradient(135deg, 
      rgba(15, 23, 42, 0.98) 0%, 
      rgba(30, 41, 59, 0.95) 100%);
    border-color: rgba(51, 65, 85, 0.6);
  }
  
  .nav-sub .nav-item > a {
    color: #94a3b8;
  }
  
  .nav-sub .nav-item > a:hover {
    background: linear-gradient(135deg, 
      rgba(59, 130, 246, 0.15) 0%, 
      rgba(37, 99, 235, 0.1) 100%);
    border-color: rgba(59, 130, 246, 0.3);
    color: #bfdbfe;
  }
}

/* 고성능 브라우저를 위한 추가 효과 */
@supports (backdrop-filter: blur(20px)) {
  .nav-item > a {
    background: rgba(255, 255, 255, 0.7);
  }
  
  .nav-item.is-active > a {
    background: rgba(59, 130, 246, 0.9);
  }
}

/* 축소 모션 선호 사용자를 위한 설정 */
@media (prefers-reduced-motion: reduce) {
  .nav-item > a,
  .nav-sub,
  .nav-sub .nav-item > a {
    transition: none;
    animation: none;
  }
  
  .nav-item > a:hover,
  .nav-item.is-active > a:hover,
  .nav-sub .nav-item > a:hover {
    transform: none;
  }
}