#ending-section {
  position: relative;
  height: 100vh;
  width: 100vw;
  overflow: hidden;
}

.rotating-bg {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 200vw;
  height: 200vw;
  transform: translate(-50%, -50%);
  background-image: url('images/ending_bg-15.png'); /* 放你的PNG路径 */
  background-size: cover;
  animation: rotate 60s linear infinite;
  opacity: 0.15;
  z-index: 0;
}

@keyframes rotate {
  0% {
    transform: translate(-50%, -50%) rotate(0deg);
  }
  100% {
    transform: translate(-50%, -50%) rotate(360deg);
  }
}

.ending-text-container {
  position: relative;
  z-index: 10;
  height: 100%;
  width: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  pointer-events: none;
}

.end-line {
  overflow: visible;
  display: block;
  line-height: 1.2;
  font-size: clamp(2rem, 7vw, 6rem);
  text-align: center;
  white-space: nowrap;
  color: #5A48E5;
  transform-origin: center;
}

.end .char {
  display: inline-block;
  transform-origin: center bottom;
}


/* Back to Top Button */
#back-to-top {
  position: absolute;
  bottom: 15vh;
  left: 50%;
  transform: translateX(-50%);
  font-family: 'Edu SA Beginner', cursive;
  padding: 1rem 2rem;
  font-size: 1rem;
  border: none;
  background-color: #9AC1F0;
  color: #FFFAF2;
  border-radius: 2rem;
  cursor: pointer;
  box-shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.1);
  transition: background-color 0.3s ease, transform 0.3s ease;
  z-index: 10;
}

#back-to-top:hover {
  background-color: #e0b933;
  transform: translateX(-50%) scale(1.05);
}