.offline-flipbook {
  max-width: 1180px;
  margin: 48px auto 0;
}

.offline-flipbook-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.offline-flipbook-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  font-variant-numeric: tabular-nums;
}

.offline-flipbook-controls button {
  width: 44px;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--paper);
  color: var(--ink);
  font-size: 21px;
  cursor: pointer;
}

.offline-flipbook-controls button:hover:not(:disabled) {
  background: var(--ink);
  color: var(--light);
}

.offline-flipbook-controls button:disabled {
  opacity: 0.38;
  cursor: not-allowed;
}

.offline-flipbook-progress {
  width: min(100%, 920px);
  height: 4px;
  margin: 15px auto 22px;
  background: var(--line);
  border-radius: 4px;
  overflow: hidden;
}

.offline-flipbook-progress span {
  display: block;
  width: 0;
  height: 100%;
  background: var(--orange);
  transition: width 0.25s ease;
}

.offline-flipbook-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: min(72svh, 700px);
  min-height: 400px;
  padding: clamp(12px, 3vw, 34px);
  border: 1px solid #aa9b83;
  border-radius: 12px;
  background: radial-gradient(ellipse at 50% 45%, #e6dccb 0, #cfc1aa 68%, #b5a58b 100%);
  box-shadow: 0 24px 60px #23211f20, inset 0 1px #fff9;
  overflow: hidden;
}

/* CRITICAL FIX: Never set both width: 100% and height: 100% on .offline-flipbook-book!
   Instead, lock its aspect-ratio to 2 pages (640 / 300) and fit it inside the stage */
.offline-flipbook-book,
.offline-flipbook-stage .stf__parent {
  width: auto !important;
  height: 100% !important;
  max-width: 100% !important;
  aspect-ratio: 640 / 300 !important;
  margin: 0 auto !important;
}

.offline-flipbook-book .stf__wrapper {
  position: relative;
  width: 100%;
  height: 100%;
  box-sizing: border-box;
}

/* Remove solid background on .stf__block so it doesn't mask container size mismatches */
.offline-flipbook-book .stf__block {
  background: transparent;
}

.offline-flipbook-page {
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
  background: #fffefa;
  margin: 0;
  border: none;
  box-sizing: border-box;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.offline-flipbook-page img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  user-select: none;
  -webkit-user-drag: none;
}

.offline-page-number {
  position: absolute;
  right: 5%;
  bottom: 3%;
  z-index: 2;
  color: #625b50;
  font: 11px/1 Georgia, serif;
  font-variant-numeric: tabular-nums;
  text-shadow: 0 1px #fff;
}

.offline-flipbook-hint {
  margin-top: 14px;
  text-align: center;
  color: var(--muted);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

@media (max-width: 600px) {
  .offline-flipbook {
    margin-top: 32px;
  }
  .offline-flipbook-toolbar {
    padding: 10px 12px;
  }
  .offline-flipbook-controls {
    gap: 8px;
    font-size: 11px;
  }
  .offline-flipbook-controls button {
    width: 38px;
    height: 38px;
  }
  .offline-flipbook-stage {
    height: 64svh;
    min-height: 340px;
    padding: 10px;
    border-radius: 8px;
  }
  .offline-page-number {
    font-size: 9px;
  }
  .offline-flipbook-hint {
    font-size: 9px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .offline-flipbook-progress span {
    transition: none;
  }
}