.view-chapters{
  min-height:100svh;
  background-image: url('../assets/bg/B_title.jpg');
  background-size: cover;
  background-position: center;
  position:relative;
  overflow:hidden;
}
.view-chapters::after{
  content:''; position:fixed; inset:0;
  background: linear-gradient(to bottom, rgba(255,255,255,0) 0%, rgba(255,255,255,0.8) 100%);
  pointer-events:none;
}

.back-btn{
  position: fixed;
  top: max(16px, env(safe-area-inset-top));
  right: max(16px, env(safe-area-inset-right));
  z-index: 2;
  background: transparent;
  border: none;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  -webkit-tap-highlight-color: transparent;
  cursor: pointer;
  padding: 0;
  transition: opacity .2s ease, transform .2s ease;
}
.back-btn:hover{
  opacity: .8;
  transform: scale(1.05);
}
.back-btn:active{
  transform: scale(0.95);
}
.back-btn img{
  display: block;
  width: clamp(36px, 5vw, 48px);
  height: auto;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,.2));
}
@media (max-width: 768px){
  .back-btn img{ width: clamp(32px, 6vw, 40px); }
}


/* 사운드 on/off 버튼 (chapter-select 페이지 전용 - 좌측 상단) */
#page-chapter-select .sound-toggle {
  position: fixed;
  top: max(16px, env(safe-area-inset-top));
  left: max(16px, env(safe-area-inset-left));
  z-index: 2;
  background: transparent;
  border: none;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  -webkit-tap-highlight-color: transparent;
  cursor: pointer;
  padding: 0;
  transition: opacity .2s ease, transform .2s ease;
}
#page-chapter-select .sound-toggle:hover {
  opacity: .8;
  transform: scale(1.05);
}
#page-chapter-select .sound-toggle:active {
  transform: scale(0.95);
}
#page-chapter-select .sound-toggle img {
  display: block;
  width: clamp(36px, 5vw, 48px);
  height: auto;
  filter: drop-shadow(0 4px 8px rgba(0,0,0,.2));
}
@media (max-width: 768px) {
  #page-chapter-select .sound-toggle img { 
    width: clamp(32px, 6vw, 40px); 
  }
}

/* PC: 그리드 레이아웃 */
.tickets{
  position: relative; z-index: 1;
  display: grid;
  grid-template-columns: repeat(4, auto);
  justify-content: center; align-content: center; justify-items: center;
  height: 100svh;
  padding: clamp(8px, 1.5vw, 20px);
  gap: clamp(4px, 1vw, 12px);
  overflow: hidden;
}

.ticket{
  background:transparent; 
  width: clamp(190px, 14vw, 280px);
  border: none;
  outline: none;
  -webkit-appearance: none;
  appearance: none;
  -webkit-tap-highlight-color: transparent;
  cursor: pointer;
  transition: all .25s ease;
}
.ticket:hover {
  transform: translateY(-4px) scale(1.05);
}
.ticket:hover picture,
.ticket:hover img {
  filter: drop-shadow(0 12px 24px rgba(0,0,0,.4));
}
.ticket:active {
  transform: translateY(-2px) scale(1.02);
}
.ticket picture, .ticket img{ 
  display:block; 
  width:100%; 
  height:auto;
  filter: drop-shadow(0 6px 12px rgba(0,0,0,.25));
  transition: filter .25s ease;
}
.ticket:focus,
.ticket:focus-visible {
  outline: none;
}

/* 태블릿/모바일: 스와이프 슬라이드 */
@media (max-width: 1024px){
  .tickets{ 
    display: flex;
    flex-direction: row;
    justify-content: flex-start;
    align-items: center;
    height: 100svh;
    padding: 0;
    gap: clamp(16px, 3vw, 24px);
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    /* 스크롤바 숨기기 */
    scrollbar-width: none;
    -ms-overflow-style: none;
    /* iOS 중앙정렬을 위한 padding */
    padding-left: calc(50vw - clamp(90px, 22.5vw, 130px));
    padding-right: calc(50vw - clamp(90px, 22.5vw, 130px));
  }
  .tickets::-webkit-scrollbar {
    display: none;
  }
  
  .ticket{ 
    flex-shrink: 0;
    width: clamp(180px, 45vw, 260px);
    scroll-snap-align: center;
    scroll-snap-stop: always;
    /* 비활성 티켓은 작고 투명하게 */
    opacity: 0.5;
    transform: scale(0.85);
    transition: all 0.4s ease;
    /* 비활성 티켓은 클릭 불가 */
    pointer-events: none;
  }
  
  /* 중앙(활성) 티켓 강조 */
  .ticket.active {
    opacity: 1;
    transform: scale(1);
    /* 활성 티켓만 클릭 가능 */
    pointer-events: auto;
  }
  
  /* 모바일/태블릿 티켓 클릭 애니메이션 */
  .ticket:active {
    transform: scale(0.75) !important;
    transition: transform 0.1s ease !important;
  }
  
  .ticket.active:active {
    transform: scale(0.92) !important;
    transition: transform 0.1s ease !important;
  }
  
  /* 클릭 애니메이션 클래스 */
  .ticket.clicked {
    animation: mobileTicketClick 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  }
  
  .ticket.active.clicked {
    animation: mobileTicketClickActive 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
  }
  
  @keyframes mobileTicketClick {
    0% { transform: scale(0.85); }
    50% { transform: scale(0.95); }
    100% { transform: scale(0.85); }
  }
  
  @keyframes mobileTicketClickActive {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
  }

  /* 화살표 버튼 */
  .carousel-arrow {
    position: fixed;
    top: 50%;
    transform: translateY(-50%);
    z-index: 10;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    outline: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: #333;
    box-shadow: 0 4px 12px rgba(0,0,0,.2);
    transition: all .2s ease;
    -webkit-tap-highlight-color: transparent;
  }
  
  .carousel-arrow:hover {
    background: rgba(255, 255, 255, 1);
    transform: translateY(-50%) scale(1.1);
    box-shadow: 0 6px 16px rgba(0,0,0,.3);
  }
  
  .carousel-arrow:active {
    transform: translateY(-50%) scale(0.95);
  }
  
  .carousel-arrow--prev {
    left: max(16px, env(safe-area-inset-left));
  }
  
  .carousel-arrow--next {
    right: max(16px, env(safe-area-inset-right));
  }
  
  .carousel-arrow svg {
    width: 20px;
    height: 20px;
  }
}

@media (max-width: 768px){
  .tickets {
    /* iOS 중앙정렬을 위한 padding */
    padding-left: calc(50vw - clamp(80px, 25vw, 110px));
    padding-right: calc(50vw - clamp(80px, 25vw, 110px));
  }
  
  .ticket{ 
    width: clamp(160px, 50vw, 220px);
  }

  .carousel-arrow {
    width: 36px;
    height: 36px;
  }
  
  .carousel-arrow svg {
    width: 18px;
    height: 18px;
  }
}

@media (orientation: landscape) and (max-height: 480px){
  .tickets{ 
    padding-top: clamp(20px, 4vh, 32px);
    padding-bottom: clamp(20px, 4vh, 32px);
  }
  .ticket{ 
    width: clamp(140px, 40vw, 180px);
  }
}

/* PC에서는 화살표 숨김 */
@media (min-width: 1025px){
  .carousel-arrow {
    display: none;
  }
}