frontend/src/ThemeToggle.css

/* Theme Toggle Styles */
.theme-toggle {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  outline: none;
}

.toggle-track {
  width: 70px;
  height: 36px;
  border-radius: 18px;
  position: relative;
  overflow: hidden;
  transition: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  box-shadow:
    0 4px 20px rgba(0, 0, 0, 0.2),
    inset 0 -2px 10px rgba(0, 0, 0, 0.1),
    inset 0 2px 10px rgba(255, 255, 255, 0.2);
}

/* Light mode track (sky blue gradient) */
.theme-toggle.light .toggle-track {
  background: linear-gradient(180deg, #87CEEB 0%, #4FC3F7 50%, #81D4FA 100%);
  border: 2px solid rgba(255, 255, 255, 0.4);
}

/* Dark mode track (night sky gradient) */
.theme-toggle.dark .toggle-track {
  background: linear-gradient(180deg, #1a237e 0%, #0a0e35 50%, #121858 100%);
  border: 2px solid rgba(255, 193, 7, 0.3);
}

.toggle-thumb {
  position: absolute;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  top: 4px;
  z-index: 10;
  /* Thumb always on top */
  transition: all 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow:
    0 2px 10px rgba(0, 0, 0, 0.3),
    0 0 20px rgba(255, 193, 7, 0.2);
}

/* Light mode thumb (sun) */
.theme-toggle.light .toggle-thumb {
  left: 4px;
  background: linear-gradient(135deg, #FFF9C4 0%, #FFD54F 50%, #FFC107 100%);
  box-shadow:
    0 0 20px rgba(255, 193, 7, 0.6),
    0 0 40px rgba(255, 193, 7, 0.3),
    inset 0 -2px 5px rgba(255, 152, 0, 0.3);
}

/* Dark mode thumb (moon) */
.theme-toggle.dark .toggle-thumb {
  left: 38px;
  background: linear-gradient(135deg, #E8EAF6 0%, #C5CAE9 50%, #9FA8DA 100%);
  box-shadow:
    0 0 15px rgba(197, 202, 233, 0.5),
    0 0 30px rgba(159, 168, 218, 0.3);
}

.toggle-icon {
  font-size: 14px;
  transition: all 0.4s ease;
}

.theme-toggle.light .toggle-icon {
  color: #FF8F00;
}

.theme-toggle.dark .toggle-icon {
  color: #5C6BC0;
}

/* Stars animation for dark mode */
.toggle-stars {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 5;
  /* Stars behind thumb */
}

.star {
  position: absolute;
  color: #FFF9C4;
  font-size: 8px;
  opacity: 0;
  animation: twinkle 1.5s infinite;
}

.theme-toggle.dark .star {
  opacity: 1;
}

.star-1 {
  top: 8px;
  left: 10px;
  /* Moved to left side */
  animation-delay: 0s;
}

.star-2 {
  top: 20px;
  left: 18px;
  /* Moved to left side */
  animation-delay: 0.5s;
  font-size: 6px;
}

.star-3 {
  top: 12px;
  left: 28px;
  /* Moved to left side */
  animation-delay: 1s;
  font-size: 10px;
}

@keyframes twinkle {

  0%,
  100% {
    opacity: 0.3;
    transform: scale(1);
  }

  50% {
    opacity: 1;
    transform: scale(1.2);
  }
}

/* Clouds animation for light mode */
.toggle-clouds {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.cloud {
  position: absolute;
  color: rgba(255, 255, 255, 0.8);
  font-size: 12px;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.theme-toggle.light .cloud {
  opacity: 1;
  animation: float-cloud 3s infinite ease-in-out;
}

.cloud-1 {
  top: 4px;
  right: 8px;
  animation-delay: 0s;
}

.cloud-2 {
  top: 16px;
  right: 16px;
  font-size: 10px;
  animation-delay: 1.5s;
}

@keyframes float-cloud {

  0%,
  100% {
    transform: translateX(0);
  }

  50% {
    transform: translateX(3px);
  }
}

/* Hover effect */
.theme-toggle:hover .toggle-track {
  transform: scale(1.05);
  box-shadow:
    0 6px 25px rgba(0, 0, 0, 0.3),
    inset 0 -2px 10px rgba(0, 0, 0, 0.1),
    inset 0 2px 10px rgba(255, 255, 255, 0.2);
}

.theme-toggle:hover .toggle-thumb {
  transform: scale(1.1);
}

/* Focus state for accessibility */
.theme-toggle:focus-visible .toggle-track {
  outline: 3px solid var(--turkcell-yellow);
  outline-offset: 3px;
}