body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #111;
  color: white;
  text-align: center;
}

h1 {
  margin: 20px 0 12px;
  font-size: 1.5rem;
  padding: 0 12px;
}

.controls {
  margin-bottom: 15px;
}

button {
  padding: 10px 15px;
  margin: 5px;
  border: none;
  background: #00a86b;
  color: white;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
}

#book {
  width: min(92vw, 1100px);
  height: min(92vw, 1100px);
  max-height: 560px;
  margin: 0 auto 24px;
}

/* Flipbook pages */
.page {
  background: #111;
  overflow: hidden;
}

.page img {
  width: calc(100% + 2px);
  height: calc(100% + 2px);
  margin-left: -1px;
  margin-top: -1px;
  display: block;
  object-fit: cover;
}

.dummy-page {
  background: #000;
}

/* Clean up library visuals */
.stf__parent {
  margin: 0 auto !important;
}

.stf__wrapper {
  background: transparent !important;
}

.stf__block {
  margin: 0 !important;
}

.stf__item {
  background: #111 !important;
}

.stf__outerShadow,
.stf__innerShadow,
.stf__hardShadow,
.stf__hardInnerShadow {
  display: none !important;
}

/* Mobile fallback booklet */
#mobilePages {
  display: none;
  width: min(96vw, 700px);
  margin: 0 auto 24px;
  padding: 0 8px 16px;
}

#mobilePages img {
  width: 100%;
  display: block;
  margin-bottom: 12px;
  border-radius: 6px;
}

/* Phone view */
@media (max-width: 700px) {
  .controls,
  #book {
    display: none;
  }

  #mobilePages {
    display: block;
  }

  h1 {
    font-size: 1.2rem;
    margin: 16px 0 12px;
  }
}