:root {
  --controls-reserve: 92px;
}

#controls {
  position: fixed;
  left: 50%;
  bottom: max(14px, env(safe-area-inset-bottom));
  z-index: 50;
  width: min(980px, calc(100vw - 24px));
  max-width: calc(100vw - 16px);
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 16px;
  box-shadow: 0 18px 54px rgba(0,0,0,0.34);
  transform: translateX(-50%);
  box-sizing: border-box;
}

#attribution {
  display: none;
}

#flipbook-container {
  padding-bottom: calc(var(--controls-reserve, 92px) + env(safe-area-inset-bottom, 0px));
}

#controls button,
#controls .control-link {
  background: none;
  border: 1px solid rgba(255,255,255,0.2);
  color: #fff;
  width: 36px;
  height: 36px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s;
  flex-shrink: 0;
  text-decoration: none;
}

#controls .control-link:hover {
  background: rgba(255,255,255,0.1);
  border-color: rgba(255,255,255,0.4);
}

#flipbook-container.is-zoomed { cursor: grab; }
#flipbook-container.is-zoomed.is-panning { cursor: grabbing; }

.nav-overlay {
  touch-action: manipulation;
}
#flipbook-sizer.zoomed {
  transition: transform 120ms ease;
}

#flipbook-container.is-panning #flipbook-sizer.zoomed {
  transition: none;
  will-change: transform;
}

#flipbook-container.is-zoomed .stf__outerShadow,
#flipbook-container.is-zoomed .stf__innerShadow,
#flipbook-container.is-zoomed .stf__hardShadow,
#flipbook-container.is-zoomed .stf__hardInnerShadow,
#flipbook-container.is-zoomed .stf__item:not(.--simple) {
  display: none !important;
}

.flip-page {
  width: 100%;
  height: 100%;
  overflow: hidden;
  background: #fff;
}

.flip-page-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
  image-rendering: auto;
  user-select: none;
  -webkit-user-drag: none;
}

@media (max-width: 768px) {
  #controls {
    width: calc(100vw - 12px);
    max-width: 100%;
    display: grid;
    grid-template-columns: repeat(9, minmax(0, 1fr));
    align-items: center;
    justify-items: center;
    gap: clamp(1px, 0.5vw, 4px);
    padding: 6px clamp(4px, 1.2vw, 8px);
  }

  #controls button,
  #controls .control-link {
    width: min(100%, clamp(28px, 9vw, 38px));
    height: min(100%, clamp(28px, 9vw, 38px));
    aspect-ratio: 1;
    justify-self: center;
  }

  #controls button svg,
  #controls .control-link svg {
    width: 58%;
    height: 58%;
  }

  #page-indicator {
    min-width: 0;
    width: 100%;
    font-size: clamp(9px, 2.6vw, 12px);
    text-align: center;
    white-space: nowrap;
  }

  #page-slider-container,
  .controls-spacer {
    display: none;
  }

  #flipbook-container {
    align-items: flex-start;
    padding-left: 4px;
    padding-right: 4px;
    padding-top: 12px;
  }

  #flipbook-sizer {
    margin: 0 auto !important;
  }

  .nav-overlay {
    width: clamp(34px, 9vw, 40px);
    height: clamp(34px, 9vw, 40px);
  }
}