/* Checkbox Container */
.container {
  position: relative;
  display: inline-flex;
  align-items: center;
  cursor: pointer;
  font-size: 20px;
  user-select: none;
  padding: 1em;
  gap: 0.5em;
}

/* Hidden Input */
.container input {
  position: absolute;
  opacity: 0;
  cursor: pointer;
  height: 0;
  width: 0;
}

/* Checkmark Base */
.checkmark {
  position: relative;
  height: 1.5em;
  width: 1.5em;
  background: linear-gradient(135deg, #ffffff, #f0f0f5);
  border: 0.15em solid #b0b0c0;
  border-radius: 0.3em;
  box-shadow:
    inset 0 2px 4px rgba(255, 255, 255, 0.8),
    0 2px 6px rgba(0, 0, 0, 0.1);
  transition:
    all 0.3s ease,
    transform 0.2s ease;
}

/* Checkmark Decorative Elements */
.checkmark::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0.8em;
  height: 0.2em;
  background: transparent;
  border-radius: 2em;
  transform: translate(-50%, -50%) scale(0);
  transition:
    transform 0.3s cubic-bezier(0.68, -0.55, 0.27, 1.55),
    background 0.2s ease;
}

/* Checked State */
.container input:checked ~ .checkmark {
  background: linear-gradient(135deg, #f44336, #ef5350);
  border-color: #d32f2f;
  box-shadow:
    0 0 8px rgba(244, 67, 54, 0.5),
    inset 0 2px 4px rgba(255, 255, 255, 0.3);
}

.container input:checked ~ .checkmark::before {
  background: #ffffff;
  transform: translate(-50%, -50%) scale(1) rotate(-45deg);
  box-shadow: 0 0 6px rgba(255, 255, 255, 0.8);
}

/* Checkmark Secondary Element */
.checkmark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0.2em;
  height: 0.8em;
  background: transparent;
  border-radius: 2em;
  transform: translate(-50%, -50%) scale(0);
  transition:
    transform 0.3s cubic-bezier(0.68, -0.55, 0.27, 1.55),
    background 0.2s ease;
}

.container input:checked ~ .checkmark::after {
  background: #ffffff;
  transform: translate(-50%, -50%) scale(1) rotate(-45deg);
  transition-delay: 0.1s;
}

/* Hover State */
.container:hover .checkmark {
  border-color: #8888a0;
  box-shadow:
    inset 0 2px 4px rgba(255, 255, 255, 0.8),
    0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Focus State */
.container input:focus + .checkmark {
  border-color: #ef5350;
  box-shadow:
    0 0 12px rgba(244, 67, 54, 0.6),
    inset 0 2px 4px rgba(255, 255, 255, 0.8);
}

/* Click Animation */
.container input:checked ~ .checkmark {
  animation: bounceIn 0.4s ease-out;
}

/* Active Press Effect */
.container:active .checkmark {
  transform: scale(0.9);
  box-shadow:
    inset 0 1px 2px rgba(255, 255, 255, 0.8),
    0 1px 4px rgba(0, 0, 0, 0.1);
}

/* Bounce Animation */
@keyframes bounceIn {
  0% {
    transform: scale(0.7);
  }
  50% {
    transform: scale(1.1);
  }
  100% {
    transform: scale(1);
  }
}