:root {
  --bg-dark: #05060a;
  --panel: #101320;
  --accent: #41e4ff; /* Cyan */
  --accent-2: #ff4fbf; /* Neon Pink */
  --text-main: #ffffff;
  --text-muted: #a0a6c0;
}

body {
  margin: 0;
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: system-ui, -apple-system, sans-serif;
  overflow-x: hidden;
  min-height: 100vh;
}

/* --- BACKGROUND EFFECTS: RANDOMIZED STAR FIELD --- */
.fixed-background {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: radial-gradient(circle at top, #191b32 0, #05060a 60%, #020208 100%);
  overflow: hidden;
  /* Hardware acceleration for smooth animation */
  transform: translateZ(0);
}

/* Star Layers */
.fixed-background::before,
.fixed-background::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-repeat: repeat;
  will-change: background-position;
}

/* Layer 1: Large Stars (Slower, Brighter, More Random) */
.fixed-background::before {
  /* A complex pattern of random coordinates to simulate chaos */
  background-image: 
    radial-gradient(2px 2px at 20px 30px, #eee, transparent),
    radial-gradient(2px 2px at 100px 70px, #fff, transparent),
    radial-gradient(2px 2px at 200px 40px, #ddd, transparent),
    radial-gradient(2px 2px at 350px 120px, #fff, transparent),
    radial-gradient(2px 2px at 450px 20px, #eee, transparent),
    radial-gradient(2px 2px at 60px 300px, #fff, transparent),
    radial-gradient(2px 2px at 250px 400px, #ccc, transparent),
    radial-gradient(2px 2px at 400px 320px, #fff, transparent),
    radial-gradient(1px 1px at 150px 220px, rgba(255,255,255,0.7), transparent),
    radial-gradient(1px 1px at 300px 180px, rgba(255,255,255,0.8), transparent),
    radial-gradient(2px 2px at 520px 480px, #fff, transparent);
  
  background-size: 550px 550px;
  opacity: 0.8;
  animation: scrollDownLarge 80s linear infinite;
}

/* Layer 2: Small/Distant Stars (Faster, Fainter, High Density) */
.fixed-background::after {
  background-image: 
    radial-gradient(1px 1px at 10px 10px, #fff, transparent),
    radial-gradient(1px 1px at 80px 50px, #aaa, transparent),
    radial-gradient(1px 1px at 150px 120px, #fff, transparent),
    radial-gradient(1px 1px at 230px 10px, #bbb, transparent),
    radial-gradient(1px 1px at 320px 90px, #fff, transparent),
    radial-gradient(1px 1px at 40px 220px, #ddd, transparent),
    radial-gradient(1px 1px at 180px 300px, #fff, transparent),
    radial-gradient(1px 1px at 300px 250px, #aaa, transparent),
    radial-gradient(1px 1px at 380px 350px, #fff, transparent),
    radial-gradient(1px 1px at 20px 400px, #ccc, transparent),
    radial-gradient(1px 1px at 120px 450px, #fff, transparent),
    radial-gradient(1px 1px at 260px 480px, #bbb, transparent);
  
  background-size: 400px 400px; /* Different size to offset patterns */
  opacity: 0.5;
  animation: scrollDownSmall 50s linear infinite;
}

/* Seamless Vertical Scroll Animations */
@keyframes scrollDownLarge {
  from { background-position: 0 0; }
  to { background-position: 0 550px; }
}

@keyframes scrollDownSmall {
  from { background-position: 0 0; }
  to { background-position: 0 400px; }
}

.book-shell {
  max-width: 1000px;
  margin: 0 auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* Navigation */
.top-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px; 
}
.back-link {
  color: var(--accent);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  transition: color 0.2s;
}
.back-link:hover {
  color: #fff;
}

/* Page Header Styles */
.page-header {
  text-align: center;
  margin-bottom: 30px;
}

h1 {
  font-size: 2.5rem;
  margin: 0;
  background: linear-gradient(to right, #fff, #a0a6c0);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: -1px;
  text-transform: uppercase;
}

/* --- 3D CAROUSEL CSS --- */
.carousel-scene {
  position: relative;
  width: 100%;
  height: 400px; 
  perspective: 1000px; 
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 10px;
}

.carousel {
  width: 240px; 
  height: 360px;
  position: absolute;
  transform-style: preserve-3d;
  transition: transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.carousel-cell {
  position: absolute;
  width: 240px;
  height: 360px;
  left: 0;
  top: 0;
  border-radius: 6px;
  cursor: pointer;
  transition: filter 0.5s;
  filter: brightness(0.4); 
}

.carousel-cell.is-selected {
  filter: brightness(1) drop-shadow(0 0 30px rgba(65, 228, 255, 0.3));
  cursor: default;
}

.carousel-cell img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid rgba(255,255,255,0.2);
  box-shadow: inset 2px 0 10px rgba(255,255,255,0.2);
}

/* Carousel Navigation Arrows */
.carousel-controls {
  display: flex;
  justify-content: center;
  gap: 40px;
  margin-bottom: 30px;
}

.nav-arrow {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.2);
  color: var(--accent);
  font-size: 1.2rem;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  cursor: pointer;
  transition: all 0.2s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.nav-arrow:hover {
  background: var(--accent);
  color: #000;
  box-shadow: 0 0 15px rgba(65, 228, 255, 0.4);
}

/* --- INFO PANEL CSS --- */
.book-details {
  background: var(--panel);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: 20px;
  padding: 30px;
  box-shadow: 0 20px 50px rgba(0,0,0,0.5);
  transform: translateY(0);
  transition: opacity 0.3s, transform 0.3s;
}

.book-details.fading-out {
  opacity: 0;
  transform: translateY(10px);
}

.details-content {
  text-align: center;
}

/* Book Title specific style */
.book-details h2 {
  margin: 0;
  font-size: 2rem;
  color: #fff;
  background: none; 
  -webkit-text-fill-color: initial;
  line-height: 1.1;
  text-transform: uppercase;
  letter-spacing: -1px;
}

h3 {
  margin: 5px 0 15px 0;
  font-size: 1.1rem;
  color: var(--accent);
  font-weight: 400;
}

.author-line {
  font-size: 0.9rem;
  color: var(--text-muted);
  border-bottom: 1px solid rgba(255,255,255,0.1);
  padding-bottom: 15px;
  margin-bottom: 15px;
}
.highlight { color: white; font-weight: 600; }

.blurb-container {
  font-size: 1rem;
  line-height: 1.7;
  color: #d1d5db;
  margin-bottom: 25px;
  text-align: center; 
}
.blurb-container p { margin-bottom: 12px; }
.blurb-container ul { 
    padding-left: 0; 
    margin-bottom: 15px; 
    list-style-position: inside; 
}
.blurb-container li { margin-bottom: 5px; color: var(--text-muted); }

.buy-btn {
  display: inline-block;
  background: var(--accent);
  color: #000;
  text-decoration: none;
  font-weight: 700;
  padding: 12px 24px;
  border-radius: 99px;
  transition: transform 0.2s, box-shadow 0.2s;
  text-transform: uppercase;
  font-size: 0.85rem;
  letter-spacing: 0.5px;
}
.buy-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 20px rgba(65, 228, 255, 0.4);
}

.footer {
  text-align: center;
  margin-top: 40px;
  font-size: 0.8rem;
  color: #ffffff; 
}
.footer a { 
  color: #ffffff; 
  text-decoration: none; 
  opacity: 1; /* Made fully white as requested */
  transition: opacity 0.2s;
}
.footer a:hover {
  text-decoration: underline;
  opacity: 0.8;
}

@media (max-width: 600px) {
  .carousel-scene { height: 320px; }
  .carousel, .carousel-cell { width: 160px; height: 240px; }
  h1 { font-size: 1.8rem; } 
  .book-details h2 { font-size: 1.6rem; }
}