/* Container styling */
.container {
  display: inline-block;
  position: relative;
  cursor: pointer;
  user-select: none;
}

/* Hide default checkbox */
.container input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

/* Wrapper for checkbox elements */
.checkbox-wrapper {
  position: relative;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Checkmark (square transforming to star) */
.checkmark {
  position: absolute;
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #0a0a23, #1c2526);
  border: 2px solid #4b5eaa;
  border-radius: 12px;
  transition:
    transform 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55),
    background 0.3s ease-in-out,
    border-color 0.3s ease,
    border-radius 0.3s ease;
  box-shadow: 0 0 8px rgba(75, 94, 170, 0.3);
}

/* Hover effect */
.container:hover .checkmark {
  transform: scale(1.1);
  box-shadow: 0 0 12px rgba(75, 94, 170, 0.5);
}

/* Checked state: Transform to star shape */
.container input:checked ~ .checkbox-wrapper .checkmark {
  background: linear-gradient(135deg, #ff5e62, #ffd452);
  border-color: #ffd452;
  border-radius: 50%;
  transform: rotate(45deg) scale(1.2);
  box-shadow: 0 0 20px rgba(255, 212, 82, 0.8);
}

/* Star checkmark symbol (pseudo-element) */
.checkmark::after {
  content: "";
  position: absolute;
  display: none;
  left: 50%;
  top: 50%;
  width: 10px;
  height: 10px;
  background: transparent;
  border: 2px solid #fff;
  border-radius: 50%;
  transform: translate(-50%, -50%) scale(0);
  transition:
    transform 0.3s cubic-bezier(0.4, 0, 0.2, 1.6),
    opacity 0.3s ease-in-out;
}

/* Show star when checked */
.container input:checked ~ .checkbox-wrapper .checkmark::after {
  display: block;
  transform: translate(-50%, -50%) scale(1);
  opacity: 1;
}

/* Nebula glow effect */
.nebula-glow {
  position: absolute;
  width: 40px;
  height: 40px;
  background: radial-gradient(
    circle,
    rgba(75, 94, 170, 0.3) 10%,
    transparent 70%
  );
  border-radius: 50%;
  opacity: 0.5;
  transition:
    opacity 0.3s ease,
    transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Nebula swirl when checked */
.container input:checked ~ .checkbox-wrapper .nebula-glow {
  opacity: 1;
  transform: rotate(180deg);
  background: radial-gradient(
    circle,
    rgba(255, 94, 170, 0.5) 10%,
    rgba(255, 212, 82, 0.3) 70%
  );
  animation: swirl 1.5s infinite cubic-bezier(0.4, 0, 0.2, 1);
}

/* Swirl animation keyframes */
@keyframes swirl {
  0% {
    transform: rotate(0deg);
  }
  100% {
    transform: rotate(360deg);
  }
}

/* Sparkle effect */
.sparkle-container {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* Sparkle particles */
.sparkle-container::before,
.sparkle-container::after {
  content: "";
  position: absolute;
  width: 4px;
  height: 4px;
  background: #ffd452;
  border-radius: 50%;
  opacity: 0;
  transition: all 0.6s ease;
}

/* Sparkle animation when checked */
.container input:checked ~ .checkbox-wrapper .sparkle-container::before {
  transform: translate(12px, -12px);
  opacity: 1;
  animation: twinkle 0.8s cubic-bezier(0.5, 0, 0.5, 1) forwards;
}

.container input:checked ~ .checkbox-wrapper .sparkle-container::after {
  transform: translate(-12px, 12px);
  background: #ff5e62;
  opacity: 1;
  animation: twinkle 0.8s cubic-bezier(0.5, 0, 0.5, 1) 0.2s forwards;
}

/* Twinkle animation keyframes */
@keyframes twinkle {
  0% {
    transform: scale(1);
    opacity: 1;
  }
  100% {
    transform: scale(1.5) translate(10px, -10px);
    opacity: 0;
  }
}

/* Pulse effect on hover */
.checkbox-wrapper::before {
  content: "";
  position: absolute;
  width: 48px;
  height: 48px;
  background: rgba(75, 94, 170, 0.2);
  border-radius: 50%;
  transform: scale(0);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1.4);
  z-index: -1;
}

.container:hover .checkbox-wrapper::before {
  transform: scale(1);
}

/* Bounce animation when checked */
.container input:checked ~ .checkbox-wrapper .checkmark {
  animation: bounce 0.4s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* Bounce keyframes */
@keyframes bounce {
  0%,
  100% {
    transform: rotate(45deg) scale(1.2);
  }
  50% {
    transform: rotate(45deg) scale(1.4);
  }
}