body {
  background: #000;
  color: #fff;
}
.use-page {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.to-series-button {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 10px 20px;
    background-color: #007bff;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s;
}
.use-page h1 {
  margin: 0 0 16px;
  text-align: center;
}
.use-slider {
  position: relative;
  width: min(960px, 90vw);
  margin: 24px auto;
  overflow: hidden;
  border-radius: 12px;
  background: #111;
  box-shadow: 0 12px 30px rgba(0,0,0,0.25);
}

.use-slider .slides {
  display: flex;
  transition: transform 0.5s ease;
  touch-action: pan-y;
  position: relative;
  z-index: 1;
}

.use-slider .slide {
  min-width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background: #000;
}

.use-slider img {
  max-width: 100%;
  max-height: 70vh;
  object-fit: contain;
  display: block;
}

.use-slider .nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: rgba(0,0,0,0.55);
  color: #fff;
  font-size: 26px;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: background 0.2s ease;
  z-index: 2;
}
.use-slider .nav:hover { background: rgba(0,0,0,0.75); }
.use-slider .nav.prev { left: 10px; }
.use-slider .nav.next { right: 10px; }

.use-slider .dots {
  position: absolute;
  left: 50%;
  bottom: 12px;
  transform: translateX(-50%);
  display: flex;
  gap: 8px;
}
.use-slider .dots button {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  border: none;
  background: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}
.use-slider .dots button.active {
  background: #fff;
  transform: scale(1.1);
}