:root{
  --cover-w: 457;
  --cover-h: 639;

  --book-width: min(457px, 88vw, calc(88vh * var(--cover-w) / var(--cover-h)));
  --book-height: calc(var(--book-width) * var(--cover-h) / var(--cover-w));

  --paper-color: #f4e4bc;
  --gold: #d4af37;
  --dark-leather: #2b1d0e;
  --anim-speed: 0.8s;
}

body{
  margin:0;
  height:100vh;
  display:flex;
  justify-content:center;
  align-items:center;
  background:#050505;
  background-image: url('./assets/images/my-bg.webp');
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  box-shadow: inset 0 0 150px rgba(0,0,0,0.8);
  font-family:"Cinzel", serif;
  overflow:hidden;
  user-select:none;
}

#particles{
  position:fixed;
  inset:0;
  width:100%;
  height:100%;
  pointer-events:none;
  opacity:0.9;
  mix-blend-mode:screen;
}

.scene{
  width:var(--book-width);
  height:var(--book-height);
  perspective:1500px;
  position:relative;
  z-index:2;
}

.book{
  width:100%;
  height:100%;
  transform-style:preserve-3d;
  position:relative;
  transition:transform 0.8s ease-in-out;
}

.book.opened{
  transform:translateX(50%);
}

.leaf{
  width:100%;
  height:100%;
  position:absolute;
  top:0;
  left:0;
  transform-origin:left center;
  transform-style:preserve-3d;
  transition:transform var(--anim-speed) cubic-bezier(0.645, 0.045, 0.355, 1);
  cursor:pointer;
}

.leaf.flipped{
  transform:rotateY(-180deg);
}

.page{
  position:absolute;
  width:100%;
  height:100%;
  backface-visibility:hidden;
  border-radius:0 10px 10px 0;
  overflow:hidden;
}

.front{
  background:var(--paper-color);
  background:linear-gradient(to right, #e3d2a6 0%, var(--paper-color) 10%, var(--paper-color) 95%, #cbb788 100%);
}

.back{
  background:var(--paper-color);
  background:linear-gradient(to left, #e3d2a6 0%, var(--paper-color) 10%, var(--paper-color) 95%, #cbb788 100%);
  transform:rotateY(180deg);
  border-radius:10px 0 0 10px;
}

.cover.front.cover-front{
  background-color:var(--dark-leather);
  background-image:url("./assets/images/book-cover.webp");
  background-size:100% 100%;
  background-position:center;
  box-shadow:inset 5px 0 10px rgba(0,0,0,0.6), 10px 10px 30px rgba(0,0,0,0.7);
  border:none;
}

.cover-back{
  background-color:var(--dark-leather);
  background-image:url("./assets/images/book-back-cover.webp");
  background-size:100% 100%;
  background-position:center;
  box-shadow:inset -5px 0 10px rgba(0,0,0,0.6), -10px 10px 30px rgba(0,0,0,0.7);
  border:none;
}

.page-content{
  padding:22px;
  height:100%;
  box-sizing:border-box;
  display:flex;
  flex-direction:column;
  gap:12px;
  color:#3d2e1e;
}

.page-content.left{
  align-items:center;
  text-align:center;
}

.page-content.right{
  align-items:stretch;
}

.page-head{
  width:100%;
  display:flex;
  justify-content:space-between;
  align-items:center;
  color:#6b5b45;
  font-size:0.78rem;
  letter-spacing:1px;
  text-transform:uppercase;
  opacity:0.9;
}

.track-meta{
  white-space:nowrap;
}

.page-num{
  position:static;
  font-size:0.78rem;
  color:#7b6b55;
}

.song-title{
  color:#1f1a12;
  font-size:1.25rem;
  border-bottom:2px solid rgba(212,175,55,0.28);
  padding-bottom:6px;
  margin:0;
  text-align:center;
  width:100%;
}

.art-frame{
  width:min(86%, 330px);
  aspect-ratio:1 / 1;
  border-radius:14px;
  overflow:hidden;
  box-shadow:0 16px 34px rgba(0,0,0,0.25);
  border:1px solid rgba(0,0,0,0.14);
  background:#111;
  position:relative;
}

.art-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:radial-gradient(circle at 30% 18%, rgba(255,255,255,0.16), rgba(255,255,255,0) 48%);
}

.art-img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}

.story-text{
  font-family:"Charm", cursive;
  font-size:1.02rem;
  line-height:1.5;
  text-align:justify;
  flex:1 1 auto;
  overflow:auto;
  scrollbar-width:thin;
  scrollbar-color:#8b0000 transparent;
  margin:0;
  padding:12px 12px;
  border-radius:14px;
  background:rgba(255,255,255,0.34);
  border:1px solid rgba(0,0,0,0.10);
}

.story-text:focus{
  outline:2px solid rgba(212,175,55,0.35);
  outline-offset:2px;
}

.music-player-ui {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center; 
  gap: 12px;
  padding: 10px 10px;
  background: transparent;
  border: none;
  box-shadow: none;
  position: relative;
}

.play-trigger {
  width: auto;
  height: auto;
  background: transparent;
  color: #5c442a;
  border: none;
  box-shadow: none;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2.2rem;
  cursor: pointer;
  transition: transform 0.1s ease, color 0.2s ease;
  padding: 0;
}

.play-trigger:hover {
  transform: scale(1.1);
  color: #8c6e46;
}

.play-trigger:active {
  transform: scale(0.95);
}

.player-bar {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.seek {
  width: 100%;
  appearance: none;
  -webkit-appearance: none;
  height: 6px;
  border-radius: 10px;
  outline: none;
  cursor: pointer;
  --val: 0%;
  background: linear-gradient(
    to right,
    #a27b2d 0%,
    #fbe196 var(--val),
    rgba(0, 0, 0, 0.1) var(--val),
    rgba(0, 0, 0, 0.1) 100%
  );
  
  box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.2), 0 1px 0 rgba(255, 255, 255, 0.4);
}

.seek::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fbe196, #dca843 60%, #a27b2d);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
  border: none;
  transition: transform 0.1s ease;
}

.seek::-webkit-slider-thumb:hover {
  transform: scale(1.25);
}

.seek::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: radial-gradient(circle at 35% 35%, #fbe196, #dca843 60%, #a27b2d);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.4);
  border: none;
  cursor: pointer;
  transition: transform 0.1s ease;
}

.seek::-moz-range-thumb:hover {
  transform: scale(1.25);
}

.seek::-moz-range-track {
  background: transparent;
  border: none;
}

.time {
  display: flex;
  justify-content: space-between;
  font-family: 'Cinzel', serif;
  font-size: 0.8rem;
  font-weight: 700;
  color: #7b6b55;
}

.hint{
  position:fixed;
  bottom:24px;
  color:rgba(255,255,255,0.55);
  font-size:0.85rem;
  letter-spacing:2px;
  pointer-events:none;
  text-transform:uppercase;
  z-index:3;
}

@media (max-width: 768px){
  :root{
    --book-width: min(92vw, 457px);
  }
  .book.opened{
    transform:translateX(0);
  }
  .hint{
    width:92vw;
    text-align:center;
    letter-spacing:1px;
  }
}

.scene, .book, .page, .page-content, .page-content *{
  -webkit-user-select: none;
  -ms-user-select: none;
  user-select: none;
}

.story-text{
  -webkit-user-select: text;
  -ms-user-select: text;
  user-select: text;
}

.scene, .scene *{
  -webkit-user-select: none !important;
  -ms-user-select: none !important;
  user-select: none !important;
  -webkit-touch-callout: none !important;
}