body {
  background: #181824;
  color: #eee;
  font-family: sans-serif;
  margin: 0;
  min-height: 100vh;
}
.container {
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 1em;
  background: #232338;
  position: sticky;
  top: 0;
  z-index: 10;
  gap: 0.5em; /* Abstand zwischen Elementen */
}
button {
  background: #343454;
  color: #eee;
  border: none;
  padding: 0.7em 1.2em;
  margin: 0 1em;
  border-radius: 5px;
  cursor: pointer;
  font-size: 1em;
  transition: background 0.2s;
}
button:disabled {
  background: #55556c;
  color: #888;
  cursor: not-allowed;
}
#imageWrapper {
  overflow-x: hidden;
  padding: 2em 0;
  /* margin wird per JS gesetzt */
}
#chapterImage {
  width: 100%;
  max-width: 100%; /* max-width auf 100% der nativen Bildbreite */
  height: auto;
  display: block;
  margin: 0 auto;
  box-shadow: 0 0 20px #000b;
  border-radius: 12px;
  background: #222;
}