/* Layout shell */
.reader-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(8px);
  background: rgba(10, 12, 22, 0.55);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.reader-header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 16px;
  display: grid;
  gap: 6px;
}

.reader-title {
  margin: 0;
  color: #fff;
  font-size: 1.5rem;
  line-height: 1.2;
  letter-spacing: .3px;
}

.reader-meta {
  color: rgba(255,255,255,.85);
  font-size: .95rem;
}

.reader-progress {
  color: #fff;
  font-weight: 700;
  font-size: .9rem;
  opacity: .9;
}

/* Back link w/ subtle holo vibe */
.holographic-link {
  display: inline-block;
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  padding: 6px 10px;
  border-radius: 999px;
  position: relative;
  transition: transform .2s ease, box-shadow .2s ease, color .2s ease;
}
.holographic-link:hover {
  color: #ff4d5a;
  transform: translateY(-1px);
  box-shadow: 0 0 12px rgba(255,255,255,0.25);
}

.reader-container {
  max-width: 1100px;
  padding: 18px 16px 64px;
  margin: 0 auto;
}

/* Page blocks */
.reader-page {
  margin: 0 0 28px;
  display: block;
  scroll-margin-top: 96px; /* nicer anchor jumps under sticky header */
}

.page-image {
  display: block;
  width: min(100%, 920px);
  margin: 0 auto;
  border-radius: 14px;
  box-shadow:
    0 10px 24px rgba(0,0,0,0.45),
    0 0 0 1px rgba(255,255,255,0.05) inset;
  transition: transform .2s ease;
  will-change: transform;
}
.page-image:hover {
  transform: translateY(-2px);
}

.page-number {
  text-align: center;
  color: rgba(255,255,255,.85);
  font-size: .9rem;
  margin-top: 10px;
}

/* Notes / messages */
.reader-note {
  color: #fff;
  background: rgba(0,0,0,.35);
  border: 1px solid rgba(255,255,255,.1);
  padding: 16px 20px;
  border-radius: 12px;
  margin: 24px auto;
  max-width: 720px;
}

/* Scroll to top */
.scroll-top-btn {
  position: fixed;
  right: 18px;
  bottom: 18px;
  opacity: 0;
  pointer-events: auto;
  border: 0;
  padding: 10px 12px;
  border-radius: 999px;
  font-weight: 800;
  background: #ff2f44;
  color: #fff;
  box-shadow: 0 8px 24px rgba(255, 47, 68, .45), 0 0 0 1px rgba(255,255,255,.08) inset;
  cursor: pointer;
  transition: opacity .2s ease, transform .15s ease;
}
.scroll-top-btn:hover {
  transform: translateY(-2px);
}

/* Responsive tweaks */
@media (max-width: 640px) {
  .reader-title {
    font-size: 1.25rem;
  }
  .page-image {
    width: 100%;
  }
}