body {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  min-height: 100vh;
}

.background-container {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.dark .background-light {
  opacity: 0;
}

.dark .background-dark {
  opacity: 1;
}

.background-light,
.background-dark {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transition: opacity 0.8s ease;
}

.background-light {
  background: linear-gradient(135deg, #d9f0ff, #aee2ff);
  opacity: 1;
}

.background-dark {
  background: linear-gradient(135deg, #2b2b2b, #6b48ff);
  opacity: 0;
}

.toggle-container {
  position: relative;
  width: 80px;
  height: 40px;
  background: linear-gradient(90deg, #b5dbf8, #8cccf5);
  box-shadow: inset 0 4px 12px rgba(0, 0, 0, 0.15);
  border-radius: 20px;
  cursor: pointer;
}

.toggle-container.dark {
  background: linear-gradient(90deg, #1d2332, #222);
  box-shadow: inner 0 0 20px rgba(0, 0, 0, 0.1);
}

.toggle {
  position: absolute;
  width: 36px;
  height: 36px;
  background: linear-gradient(145deg, #ffffff, #f0f0f0);
  border-radius: 50%;
  top: 2px;
  left: 2px;
  box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
  transition: left 0.4s cubic-bezier(0.68, -0.55, 0.27, 1.55),
    background 0.8s ease, box-shadow 0.8s ease;
}

.toggle-container.dark .toggle {
  left: 42px;
  background: linear-gradient(45deg, #ffd700, #ffaa00);
  box-shadow: 0 0 15px rgba(255, 215, 0 0.9), 0 0 25px rgba(107, 72, 255, 0.7);
}

.emoji {
  position: absolute;
  top: -50px;
  left: 50%;
  font-size: 30px;
  filter: drop-shadow(0 0 10px rgba(255, 255, 255, 0.8));
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.toggle-container.dark .emoji.sun {
  opacity: 0;
  transform: translateX(-50%) translateY(-10px);
}

.toggle-container:not(.dark) .emoji.moon {
  opacity: 0;
  transform: translateX(-50%) translateY(-10px);
}

.toggle-container.dark .emoji.moon {
  opacity: 1;
  transform: translateX(-50%) translateY(0) rotate(360deg);
}

.toggle-container:not(.dark) .emoji.sun {
  opacity: 1;
  transform: translateX(-50%) translateY(0) rotate(360deg);
}