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

html, body {
  height: 100%;
}

body {
  background: #1a1a2e;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;   /* centra el conjunto flipbook+controles verticalmente */
  height: 100dvh;            /* height (no min-height) para que flex:1 del container funcione */
  overflow: hidden;          /* sin scroll: el flipbook se dimensiona para caber en el viewport */
  font-family: sans-serif;
  color: #fff;
}

/* ── Pantalla de carga ───────────────────────────────────────────────────── */
#loading-screen {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #1a1a2e;
  z-index: 9999;
  gap: 18px;
  transition: opacity .4s ease;
}
#loading-screen.hidden {
  opacity: 0;
  pointer-events: none;
}
#loading-spinner {
  width: 44px;
  height: 44px;
  border: 4px solid rgba(255,255,255,.2);
  border-top-color: #7c6ef5;
  border-radius: 50%;
  animation: spin .8s linear infinite;
}
#loading-text {
  color: rgba(255,255,255,.6);
  font-size: .85rem;
  letter-spacing: .03em;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Contenedor del flipbook ─────────────────────────────────────────────── */
#flipbook-container {
  display: flex;
  justify-content: center;
  align-items: center;
  flex: 1;
  width: 100%;
  padding: 16px 12px 0;
  min-height: 0;             /* necesario para que flex:1 no desborde en columna */
}

/* ── Controles ───────────────────────────────────────────────────────────── */
#controls {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 14px auto 16px;
  padding: 9px 18px;
  background: rgba(255,255,255,.1);
  border-radius: 50px;
  backdrop-filter: blur(10px);
  width: fit-content;
  max-width: 96vw;
  position: relative;
  z-index: 20;
  flex-wrap: nowrap;
  overflow-x: auto;
}

#controls button {
  background: none;
  border: none;
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
  padding: 4px 7px;
  border-radius: 4px;
  transition: background .2s;
  line-height: 1;
  white-space: nowrap;
  flex-shrink: 0;
}

#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: 18px;
  background: rgba(255,255,255,.25);
  margin: 0 2px;
  flex-shrink: 0;
}

#page-info {
  font-size: 0.82rem;
  min-width: 56px;
  text-align: center;
  background: rgba(255,255,255,.15);
  border-radius: 6px;
  padding: 3px 7px;
  flex-shrink: 0;
}

/* ── Panel de miniaturas ─────────────────────────────────────────────────── */
#thumbnail-panel {
  display: none;
  position: fixed;
  bottom: 76px;
  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: 92vw;
  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;
}

/* ── Banner cintillo lateral ─────────────────────────────────────────────── */
#flipbook-banner {
  position: fixed;
  top: 50%;
  transform: translateY(-50%);
  z-index: 1500;
  display: flex;
  align-items: stretch;
  filter: drop-shadow(0 4px 18px rgba(0,0,0,.45));
}

#flipbook-banner.side-left  { left: 0; flex-direction: row; }
#flipbook-banner.side-right { right: 0; flex-direction: row-reverse; }

#flipbook-banner .fb-card {
  display: flex;
  flex-direction: row;
  border-radius: 0 12px 12px 0;
  overflow: hidden;
  max-width: 340px;
  width: 34vw;
  min-width: 260px;
  transition: transform .3s ease, opacity .3s ease;
}
#flipbook-banner.side-right .fb-card {
  border-radius: 12px 0 0 12px;
  flex-direction: row-reverse;
}

#flipbook-banner .fb-img {
  width: 25%;
  flex-shrink: 0;
  object-fit: cover;
  object-position: center;
  align-self: stretch;
  display: block;
}

#flipbook-banner .fb-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 8px;
  padding: 16px 14px;
}

#flipbook-banner .fb-title {
  font-family: Inter, sans-serif;
  font-weight: 800;
  font-size: 15px;
  line-height: 1.25;
}

#flipbook-banner .fb-text {
  font-family: Inter, sans-serif;
  font-size: 12px;
  line-height: 1.5;
  opacity: .88;
}

#flipbook-banner .fb-btn {
  align-self: flex-start;
  font-family: Inter, sans-serif;
  font-size: 12px;
  font-weight: 700;
  border: none;
  border-radius: 6px;
  padding: 8px 14px;
  cursor: pointer;
  white-space: nowrap;
}

#flipbook-banner .fb-tab {
  width: 28px;
  min-height: 80px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 0 8px 8px 0;
  writing-mode: vertical-rl;
  font-family: Inter, sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .05em;
  user-select: none;
  transition: opacity .2s;
  flex-shrink: 0;
}
#flipbook-banner.side-left  .fb-tab { border-radius: 0 8px 8px 0; }
#flipbook-banner.side-right .fb-tab { border-radius: 8px 0 0 8px; order: -1; }

#flipbook-banner .fb-tab:hover { opacity: .8; }

#flipbook-banner.collapsed.side-left  .fb-card { transform: translateX(-100%); opacity: 0; pointer-events: none; position: absolute; }
#flipbook-banner.collapsed.side-right .fb-card { transform: translateX(100%); opacity: 0; pointer-events: none; position: absolute; }

/* ── Responsive móvil ────────────────────────────────────────────────────── */
@media (max-width: 700px) {
  #flipbook-container { padding: 8px 4px 0; }
  #thumbnail-panel { bottom: 68px; }

  #controls {
    gap: 6px;
    padding: 7px 12px;
    font-size: 0.9rem;
    margin: 10px auto 12px;
  }
  #controls button { font-size: 0.9rem; padding: 3px 5px; }

  #flipbook-watermark { font-size: 0.62rem !important; }

  #flipbook-banner { top: auto; transform: none; bottom: 88px; }
  #flipbook-banner.side-left  { left: 0; }
  #flipbook-banner.side-right { right: 0; }

  #flipbook-banner .fb-card {
    width: 72vw;
    min-width: 200px;
    max-width: 280px;
  }
  #flipbook-banner .fb-title { font-size: 13px; }
  #flipbook-banner .fb-text  { font-size: 11px; }
  #flipbook-banner .fb-btn   { font-size: 11px; padding: 6px 11px; }
}