.checkbox-container {
  position: relative;
  width: 50px;
  height: 50px;
  display: flex;
  justify-content: center;
  align-items: center;
}

.checkbox-input {
  display: none;
}

.checkbox-label {
  position: relative;
  width: 100%;
  height: 100%;
  background: #1a1a1a;
  border: 2px solid #00ff00;
  border-radius: 50%;
  box-shadow: 0 0 12px #00ff00;
  cursor: pointer;
  transition: all 0.3s ease;
  overflow: hidden;
  display: flex;
  justify-content: center;
  align-items: center;
}

/* Grid background */
.grid-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    45deg,
    rgba(0, 255, 0, 0.1),
    rgba(0, 255, 0, 0.1) 2px,
    transparent 2px,
    transparent 6px
  );
  opacity: 0.3;
  transition: opacity 0.3s ease;
  z-index: 0;
  animation: grid-shift 1.5s linear infinite paused;
}

/* Checkmark */
.checkmark {
  position: absolute;
  width: 30px;
  height: 30px;
  border: 3px solid #00ff00;
  border-radius: 50%;
  opacity: 0;
  transition:
    opacity 0.3s ease,
    transform 0.3s ease;
  z-index: 2;
}

.checkmark::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 12px;
  height: 6px;
  border-left: 3px solid #00ff00;
  border-bottom: 3px solid #00ff00;
  transform: translate(-50%, -70%) rotate(-45deg);
  opacity: 0;
  transition: opacity 0.3s ease;
}

/* Glitch effects */
.glitch-overlay-h {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    90deg,
    transparent,
    rgba(0, 255, 0, 0.2),
    transparent
  );
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 1;
}

.glitch-overlay-v {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(
    0deg,
    transparent,
    rgba(0, 255, 0, 0.15),
    transparent
  );
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: 1;
}

/* Binary particles */
.binary-particles {
  position: absolute;
  top: -20px;
  left: 0;
  width: 100%;
  height: 80px;
  pointer-events: none;
  z-index: 3;
}

.particle {
  position: absolute;
  color: #00ff00;
  font-size: 10px;
  opacity: 0;
  animation: particle-rise 1.2s linear infinite;
}

/* Hover state */
.checkbox-label:hover {
  box-shadow: 0 0 20px #00ff00;
  transform: scale(1.05);
}

.checkbox-label:hover .glitch-overlay-h {
  opacity: 1;
  animation: glitch-h 1s infinite;
}

.checkbox-label:hover .glitch-overlay-v {
  opacity: 1;
  animation: glitch-v 0.8s infinite;
}

/* Checked state */
.checkbox-input:checked + .checkbox-label {
  background: rgba(0, 255, 0, 0.2);
  border-color: #00ff00;
  box-shadow: 0 0 25px #00ff00;
}

.checkbox-input:checked + .checkbox-label .grid-bg {
  opacity: 0.6;
  animation-play-state: running;
}

.checkbox-input:checked + .checkbox-label .checkmark {
  opacity: 1;
  transform: rotate(360deg);
  animation: check-rotate 0.5s ease-in-out;
}

.checkbox-input:checked + .checkbox-label .checkmark::before {
  opacity: 1;
  animation: check-bounce 0.4s ease-in-out 0.1s;
}

.checkbox-input:checked + .checkbox-label .glitch-overlay-h {
  opacity: 0.8;
  animation: glitch-h 0.6s infinite;
}

.checkbox-input:checked + .checkbox-label .glitch-overlay-v {
  opacity: 0.8;
  animation: glitch-v 0.5s infinite;
}

/* Animations */
@keyframes grid-shift {
  0% {
    background-position: 0 0;
  }
  100% {
    background-position: 6px 6px;
  }
}

@keyframes glitch-h {
  0% {
    transform: translateX(-100%);
  }
  20% {
    transform: translateX(100%) skewX(5deg);
  }
  100% {
    transform: translateX(100%);
  }
}

@keyframes glitch-v {
  0% {
    transform: translateY(-100%);
  }
  30% {
    transform: translateY(100%) skewY(3deg);
  }
  100% {
    transform: translateY(100%);
  }
}

@keyframes check-rotate {
  0% {
    transform: scale(0) rotate(0deg);
  }
  50% {
    transform: scale(1.1) rotate(180deg);
  }
  100% {
    transform: scale(1) rotate(360deg);
  }
}

@keyframes check-bounce {
  0% {
    opacity: 0;
    transform: translate(-50%, -70%) rotate(-45deg) scale(0);
  }
  50% {
    opacity: 1;
    transform: translate(-50%, -70%) rotate(-45deg) scale(1.2);
  }
  100% {
    opacity: 1;
    transform: translate(-50%, -70%) rotate(-45deg) scale(1);
  }
}

@keyframes particle-rise {
  0% {
    opacity: 0;
    transform: translateY(40px);
  }
  20% {
    opacity: 0.7;
  }
  100% {
    opacity: 0;
    transform: translateY(-20px);
  }
}