* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: #2b2b2b;
  font-family: -apple-system, "Segoe UI", Arial, sans-serif;
  overflow: hidden;
}

#toolbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 46px;
  background: #11185a;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  z-index: 10;
  color: white;
}

#toolbar button {
  background: rgba(255,255,255,0.12);
  border: none;
  color: white;
  padding: 6px 12px;
  border-radius: 4px;
  cursor: pointer;
  font-size: 16px;
}

#toolbar button:hover {
  background: rgba(255,255,255,0.25);
}

#page-input {
  width: 46px;
  text-align: center;
  font-size: 14px;
  border: none;
  border-radius: 4px;
  padding: 4px 2px;
  background: rgba(255,255,255,0.12);
  color: white;
}

#page-input::-webkit-inner-spin-button,
#page-input::-webkit-outer-spin-button {
  opacity: 0.6;
}

#total-pages {
  min-width: 40px;
  font-size: 14px;
}

#book {
  position: absolute;
  top: 46px;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* StPageFlip container-т өөрөө хэмжээгээ тохируулна,
   бид зөвхөн эргэн тойрны зайг өгч байна */
.stf__parent {
  margin: auto;
}

.stf__wrapper {
  box-shadow: 0 10px 40px rgba(0,0,0,0.5);
}

@media (max-width: 700px) {
  #toolbar button { padding: 5px 8px; font-size: 14px; }
}