/* ============================================
   서울비디치과 UX Enhancements v1.0
   로딩 스켈레톤 UI + 애니메이션 최적화 + 폰트 체계 + 스크롤 스냅
   ============================================ */

/* ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
   1. 로딩 스켈레톤 UI (Loading Skeleton UI)
   ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ */

/* 스켈레톤 기본 스타일 */
.skeleton {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, rgba(30, 25, 20, 0.6) 0%, rgba(40, 35, 30, 0.8) 100%);
  border-radius: var(--radius-lg);
}

.skeleton::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    90deg,
    transparent 0%,
    rgba(201, 169, 98, 0.08) 20%,
    rgba(201, 169, 98, 0.15) 50%,
    rgba(201, 169, 98, 0.08) 80%,
    transparent 100%
  );
  animation: skeleton-shimmer 1.5s infinite ease-in-out;
  transform: translateX(-100%);
}

@keyframes skeleton-shimmer {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(100%);
  }
}

/* 스켈레톤 변형 */
.skeleton-text {
  height: 1rem;
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
}

.skeleton-text-lg {
  height: 1.5rem;
}

.skeleton-text-xl {
  height: 2rem;
}

.skeleton-text-title {
  height: 2.5rem;
  width: 60%;
  margin-bottom: 1rem;
}

.skeleton-text-short {
  width: 40%;
}

.skeleton-text-medium {
  width: 70%;
}

.skeleton-circle {
  border-radius: var(--radius-full);
}

.skeleton-card {
  padding: var(--space-6);
  background: rgba(20, 18, 16, 0.85);
  border: 1px solid rgba(201, 169, 98, 0.1);
  border-radius: var(--radius-2xl);
}

.skeleton-image {
  aspect-ratio: 16/10;
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-4);
}

.skeleton-avatar {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-full);
}

.skeleton-button {
  height: 44px;
  width: 120px;
  border-radius: var(--radius-xl);
}

/* 스켈레톤 그리드 레이아웃 */
.skeleton-grid {
  display: grid;
  gap: var(--space-4);
}

.skeleton-grid-2 {
  grid-template-columns: repeat(2, 1fr);
}

.skeleton-grid-3 {
  grid-template-columns: repeat(3, 1fr);
}

.skeleton-grid-4 {
  grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 768px) {
  .skeleton-grid-2,
  .skeleton-grid-3,
  .skeleton-grid-4 {
    grid-template-columns: 1fr;
  }
}

/* 히어로 섹션 스켈레톤 */
.skeleton-hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-8);
}

.skeleton-hero-content {
  max-width: 600px;
}

.skeleton-hero-badge {
  width: 180px;
  height: 32px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-6);
}

.skeleton-hero-title {
  height: 4rem;
  margin-bottom: var(--space-4);
  border-radius: var(--radius-lg);
}

.skeleton-hero-subtitle {
  height: 3rem;
  width: 80%;
  margin-bottom: var(--space-6);
  border-radius: var(--radius-lg);
}

.skeleton-hero-desc {
  height: 1.5rem;
  margin-bottom: var(--space-2);
  border-radius: var(--radius-sm);
}

.skeleton-hero-cta {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-8);
}

/* 카드 스켈레톤 */
.skeleton-treatment-card {
  height: 280px;
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
}

.skeleton-treatment-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-4);
}

.skeleton-doctor-card {
  text-align: center;
  padding: var(--space-8);
}

.skeleton-doctor-avatar {
  width: 120px;
  height: 120px;
  border-radius: var(--radius-full);
  margin: 0 auto var(--space-4);
}

/* FAQ 스켈레톤 */
.skeleton-faq-item {
  height: 60px;
  margin-bottom: var(--space-3);
  border-radius: var(--radius-xl);
}

/* 통계 스켈레톤 */
.skeleton-stat {
  text-align: center;
  padding: var(--space-6);
}

.skeleton-stat-number {
  height: 3rem;
  width: 80px;
  margin: 0 auto var(--space-3);
  border-radius: var(--radius-lg);
}

.skeleton-stat-label {
  height: 1rem;
  width: 100px;
  margin: 0 auto;
  border-radius: var(--radius-sm);
}

/* 로딩 오버레이 */
.page-loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: #000000;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 1;
  visibility: visible;
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.page-loading-overlay.loaded {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.loading-spinner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
}

.loading-spinner-ring {
  width: 50px;
  height: 50px;
  border: 3px solid rgba(201, 169, 98, 0.2);
  border-top-color: #C9A962;
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.loading-spinner-text {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
}

/* 콘텐츠 로딩 상태 */
.content-loading {
  position: relative;
  min-height: 200px;
}

.content-loading::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.8);
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* 이미지 로딩 플레이스홀더 */
.image-placeholder {
  background: linear-gradient(135deg, rgba(30, 25, 20, 0.8) 0%, rgba(40, 35, 30, 0.9) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(201, 169, 98, 0.3);
  font-size: 2rem;
}

.image-placeholder::after {
  content: '\f03e';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
}


/* ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
   2. 마이크로 애니메이션 최적화
   ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ */

/* 애니메이션 성능 최적화 */
.will-animate {
  will-change: transform, opacity;
}

.animate-optimized {
  transform: translateZ(0);
  backface-visibility: hidden;
}

/* 감속 모션 설정 (접근성) */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  
  .skeleton::after {
    animation: none;
  }
}

/* 최적화된 페이드 인 */
.fade-in-optimized {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1),
              transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in-optimized.visible {
  opacity: 1;
  transform: translateY(0);
}

/* 최적화된 스케일 인 */
.scale-in-optimized {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.3s ease,
              transform 0.3s ease;
}

.scale-in-optimized.visible {
  opacity: 1;
  transform: scale(1);
}

/* 최적화된 슬라이드 인 */
.slide-in-left {
  opacity: 0;
  transform: translateX(-30px);
  transition: opacity 0.4s ease,
              transform 0.4s ease;
}

.slide-in-right {
  opacity: 0;
  transform: translateX(30px);
  transition: opacity 0.4s ease,
              transform 0.4s ease;
}

.slide-in-left.visible,
.slide-in-right.visible {
  opacity: 1;
  transform: translateX(0);
}

/* 스태거 애니메이션 */
.stagger-item {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.3s ease,
              transform 0.3s ease;
}

.stagger-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.stagger-item:nth-child(1) { transition-delay: 0.05s; }
.stagger-item:nth-child(2) { transition-delay: 0.1s; }
.stagger-item:nth-child(3) { transition-delay: 0.15s; }
.stagger-item:nth-child(4) { transition-delay: 0.2s; }
.stagger-item:nth-child(5) { transition-delay: 0.25s; }
.stagger-item:nth-child(6) { transition-delay: 0.3s; }
.stagger-item:nth-child(7) { transition-delay: 0.35s; }
.stagger-item:nth-child(8) { transition-delay: 0.4s; }

/* 호버 애니메이션 최적화 */
.hover-lift {
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 0.25s ease;
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.3);
}

.hover-scale {
  transition: transform 0.2s ease;
}

.hover-scale:hover {
  transform: scale(1.02);
}

.hover-glow {
  transition: box-shadow 0.3s ease,
              border-color 0.3s ease;
}

.hover-glow:hover {
  box-shadow: 0 0 20px rgba(201, 169, 98, 0.3);
  border-color: rgba(201, 169, 98, 0.5);
}

/* 버튼 프레스 효과 */
.btn-press {
  transition: transform 0.1s ease,
              box-shadow 0.2s ease;
}

.btn-press:active {
  transform: scale(0.97);
}

/* 부드러운 페이드 토글 */
.fade-toggle {
  transition: opacity 0.2s ease,
              visibility 0.2s ease;
}

.fade-toggle.hidden {
  opacity: 0;
  visibility: hidden;
}

/* 카운터 애니메이션 */
.counter-animate {
  font-variant-numeric: tabular-nums;
  transition: transform 0.1s ease;
}

/* 펄스 애니메이션 (알림용) */
.pulse-gentle {
  animation: pulse-gentle 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes pulse-gentle {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.7;
  }
}

/* 반짝임 효과 */
.shimmer-effect {
  position: relative;
  overflow: hidden;
}

.shimmer-effect::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(201, 169, 98, 0.1),
    transparent
  );
  animation: shimmer-slide 3s infinite;
}

@keyframes shimmer-slide {
  0% {
    left: -100%;
  }
  50%, 100% {
    left: 200%;
  }
}


/* ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
   3. 폰트 사이즈 체계 (clamp() 반응형)
   NOTE: CSS 변수는 design-system.css에 통합됨 (v1.1)
   ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ */

/* 반응형 타이포그래피 클래스 */
.type-display {
  font-size: var(--font-size-display);
  font-weight: var(--font-bold);
  line-height: 1.1;
  letter-spacing: -0.02em;
}

.type-h1 {
  font-size: var(--font-size-h1);
  font-weight: var(--font-bold);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

.type-h2 {
  font-size: var(--font-size-h2);
  font-weight: var(--font-semibold);
  line-height: 1.25;
}

.type-h3 {
  font-size: var(--font-size-h3);
  font-weight: var(--font-semibold);
  line-height: 1.3;
}

.type-h4 {
  font-size: var(--font-size-h4);
  font-weight: var(--font-medium);
  line-height: 1.35;
}

.type-h5 {
  font-size: var(--font-size-h5);
  font-weight: var(--font-medium);
  line-height: 1.4;
}

.type-body-lg {
  font-size: var(--font-size-body-lg);
  line-height: 1.6;
}

.type-body {
  font-size: var(--font-size-body);
  line-height: 1.65;
}

.type-body-sm {
  font-size: var(--font-size-body-sm);
  line-height: 1.6;
}

.type-caption {
  font-size: var(--font-size-caption);
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.6);
}

.type-tiny {
  font-size: var(--font-size-tiny);
  line-height: 1.4;
  color: rgba(255, 255, 255, 0.5);
}

/* 섹션별 clamp() 타이포그래피 오버라이드 */
.section-title h2 {
  font-size: var(--font-size-h2);
}

.section-title p {
  font-size: var(--font-size-body-lg);
}

.hero-text h1 {
  font-size: var(--font-size-display);
}

.hero-desc {
  font-size: var(--font-size-body-lg);
}

.treatment-hero h1 {
  font-size: var(--font-size-h1);
}

.treatment-hero p {
  font-size: var(--font-size-body-lg);
}

.cta-content h2 {
  font-size: var(--font-size-h2);
}

.cta-content p {
  font-size: var(--font-size-body-lg);
}

/* 카드 타이포그래피 */
.card-title,
.treatment-title {
  font-size: var(--font-size-h4);
}

.card-desc,
.treatment-desc {
  font-size: var(--font-size-body);
}

/* FAQ 타이포그래피 */
.faq-question {
  font-size: var(--font-size-body-lg);
}

.faq-answer {
  font-size: var(--font-size-body);
}

/* 통계 타이포그래피 */
.stat-number {
  font-size: clamp(2rem, 4vw + 0.5rem, 3.5rem);
}

.stat-label {
  font-size: var(--font-size-body-sm);
}

/* 푸터 타이포그래피 */
.footer-col h4 {
  font-size: var(--font-size-body-sm);
}

.footer-col a {
  font-size: var(--font-size-body-sm);
}

/* 버튼 타이포그래피 */
.btn {
  font-size: var(--font-size-body);
}

.btn-lg {
  font-size: var(--font-size-body-lg);
}

.btn-sm {
  font-size: var(--font-size-body-sm);
}


/* ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
   4. 스크롤 스냅 (Scroll Snap)
   ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ */

/* 스크롤 스냅 컨테이너 */
.scroll-snap-container {
  scroll-snap-type: y proximity;
  scroll-behavior: smooth;
  overflow-y: scroll;
  height: 100vh;
}

/* 스크롤 스냅 섹션 */
.scroll-snap-section {
  scroll-snap-align: start;
  scroll-snap-stop: normal;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* 선택적 스크롤 스냅 (mandatory 대신 proximity 사용) */
.scroll-snap-soft {
  scroll-snap-type: y proximity;
}

/* 수평 스크롤 스냅 (갤러리, 캐러셀용) */
.scroll-snap-x {
  scroll-snap-type: x mandatory;
  scroll-behavior: smooth;
  overflow-x: auto;
  overflow-y: hidden;
  display: flex;
  gap: var(--space-4);
  padding: var(--space-4) 0;
  -webkit-overflow-scrolling: touch;
}

.scroll-snap-x::-webkit-scrollbar {
  height: 6px;
}

.scroll-snap-x::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 3px;
}

.scroll-snap-x::-webkit-scrollbar-thumb {
  background: rgba(201, 169, 98, 0.5);
  border-radius: 3px;
}

.scroll-snap-x::-webkit-scrollbar-thumb:hover {
  background: rgba(201, 169, 98, 0.7);
}

.scroll-snap-item {
  scroll-snap-align: center;
  flex-shrink: 0;
}

/* 섹션 인디케이터 */
.scroll-indicator-dots {
  position: fixed;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 12px;
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

.scroll-indicator-dots.active {
  opacity: 1;
  visibility: visible;
}

.scroll-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  border: 1px solid rgba(201, 169, 98, 0.3);
  cursor: pointer;
  transition: all 0.3s ease;
}

.scroll-dot:hover {
  background: rgba(201, 169, 98, 0.5);
  transform: scale(1.2);
}

.scroll-dot.active {
  background: #C9A962;
  border-color: #C9A962;
  transform: scale(1.3);
}

/* 스크롤 진행률 바 */
.scroll-progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, #8B5A2B, #C9A962);
  z-index: 1000;
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 0.1s ease-out;
}

/* 섹션 진입 표시 */
.section-indicator {
  position: fixed;
  left: 20px;
  bottom: 20px;
  padding: var(--space-2) var(--space-4);
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(201, 169, 98, 0.3);
  border-radius: var(--radius-full);
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--text-xs);
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s ease;
}

.section-indicator.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* 스크롤 투 탑 버튼 */
.scroll-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 44px;
  height: 44px;
  background: linear-gradient(135deg, #8B5A2B, #C9A962);
  border: none;
  border-radius: var(--radius-full);
  color: #ffffff;
  font-size: 1.25rem;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all 0.3s ease;
  z-index: 100;
  box-shadow: 0 4px 15px rgba(139, 90, 43, 0.4);
}

.scroll-to-top:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(139, 90, 43, 0.5);
}

.scroll-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.scroll-to-top:active {
  transform: scale(0.95);
}

/* 모바일에서 스크롤 스냅 비활성화 (옵션) */
@media (max-width: 768px) {
  .scroll-snap-container {
    scroll-snap-type: none;
    height: auto;
    overflow-y: visible;
  }
  
  .scroll-snap-section {
    min-height: auto;
    scroll-snap-align: none;
  }
  
  .scroll-indicator-dots {
    display: none;
  }
}

/* 스크롤 스냅 페이지 전용 (홈페이지 등) */
.enable-scroll-snap {
  scroll-snap-type: y proximity;
}

.enable-scroll-snap .section {
  scroll-snap-align: start;
}


/* ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■
   5. 유틸리티 클래스
   ■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■■ */

/* 숨김 스켈레톤 (로딩 완료 후) */
.skeleton-hide {
  opacity: 0;
  visibility: hidden;
  position: absolute;
  pointer-events: none;
}

/* 콘텐츠 표시 */
.content-show {
  opacity: 1;
  visibility: visible;
}

/* 로딩 중 콘텐츠 숨김 */
.loading .content-actual {
  opacity: 0;
  visibility: hidden;
}

.loading .skeleton-wrapper {
  opacity: 1;
  visibility: visible;
}

/* 로딩 완료 후 */
.loaded .content-actual {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.3s ease;
}

.loaded .skeleton-wrapper {
  opacity: 0;
  visibility: hidden;
  position: absolute;
  pointer-events: none;
}

/* GPU 가속 */
.gpu-accelerate {
  transform: translateZ(0);
  will-change: transform;
}

/* 스무스 트랜지션 */
.smooth-all {
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 인터랙션 피드백 */
.interactive {
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.interactive:active {
  transform: scale(0.98);
}