* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: #1a1a2e;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  font-family: sans-serif;
  color: #fff;
  overflow: hidden;
}

#flipbook-container {
  display: flex;
  justify-content: center;
  align-items: center;
  flex: 1;
  width: 100%;
  padding: 24px 24px 0;
}

#controls {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 16px auto 20px;
  padding: 10px 24px;
  background: rgba(255,255,255,.1);
  border-radius: 50px;
  backdrop-filter: blur(10px);
  width: fit-content;
  position: relative;
  z-index: 20;
}

#controls button {
  background: none;
  border: none;
  color: #fff;
  font-size: 1.1rem;
  cursor: pointer;
  padding: 4px 8px;
  border-radius: 4px;
  transition: background .2s;
  line-height: 1;
}

#controls button:hover { background: rgba(255,255,255,.2); }
#controls button:disabled { opacity: 0.3; cursor: default; }
#controls button:disabled:hover { background: none; }

#controls button#btn-autoplay.playing { color: #a78bfa; }

.ctrl-sep {
  width: 1px;
  height: 20px;
  background: rgba(255,255,255,.25);
  margin: 0 2px;
}

#page-info {
  font-size: 0.85rem;
  min-width: 64px;
  text-align: center;
  background: rgba(255,255,255,.15);
  border-radius: 6px;
  padding: 3px 8px;
}

/* Panel de miniaturas */
#thumbnail-panel {
  display: none;
  position: fixed;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(10,10,30,.92);
  border: 1px solid rgba(255,255,255,.15);
  border-radius: 12px;
  padding: 10px;
  z-index: 30;
  max-width: 90vw;
  backdrop-filter: blur(12px);
}

#thumbnail-panel.open { display: block; }

#thumbnail-list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  max-width: 80vw;
  padding-bottom: 4px;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,.3) transparent;
}

.thumb-item {
  flex: 0 0 auto;
  cursor: pointer;
  border-radius: 6px;
  overflow: hidden;
  border: 2px solid transparent;
  transition: border-color .15s, transform .15s;
  position: relative;
}

.thumb-item:hover { transform: scale(1.05); }
.thumb-item.active { border-color: #6c63ff; }

.thumb-item img {
  display: block;
  width: 60px;
  height: 85px;
  object-fit: cover;
}

.thumb-item span {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(0,0,0,.6);
  color: #fff;
  font-size: 0.55rem;
  text-align: center;
  padding: 2px 0;
}

@media (max-width: 700px) {
  #flipbook-container { padding: 12px 12px 0; }
  #thumbnail-panel { bottom: 72px; }
}