/* ---------- wrapper ---------- */
.cosmic-checkbox {
  --size: 28px;
  --clr-idle: #8b8fa3;
  --clr-active: #a855f7;
  --clr-glow: #c084fc;
  --clr-core: #e9d5ff;
  --clr-spark: #f0abfc;
  --duration: 0.6s;
  display: inline-flex;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

.cosmic-checkbox input {
  display: none;
}

.checkbox-container {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ---------- the box ---------- */
.checkbox-box {
  position: relative;
  width: var(--size);
  height: var(--size);
  border: 2px solid var(--clr-idle);
  border-radius: 8px;
  transition:
    border-color 0.3s,
    background 0.3s,
    box-shadow 0.3s,
    transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

/* idle hover */
.cosmic-checkbox:hover .checkbox-box {
  border-color: var(--clr-glow);
  box-shadow: 0 0 8px rgba(168, 85, 247, 0.25);
}

/* Background Element */
.checkbox-bg {
  position: absolute;
  inset: 0;
  border-radius: 6px;
  background: linear-gradient(135deg, #7c3aed, #a855f7);
  opacity: 0;
  transform: scale(0.5);
  transition:
    opacity 0.4s ease,
    transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: 1;
}

.cosmic-checkbox input:checked ~ .checkbox-container .checkbox-bg {
  opacity: 1;
  transform: scale(1);
  box-shadow:
    0 0 12px rgba(168, 85, 247, 0.5),
    0 0 30px rgba(168, 85, 247, 0.2),
    inset 0 0 8px rgba(233, 213, 255, 0.15);
}

/* ---------- checkmark ---------- */
.checkmark {
  width: 16px;
  height: 16px;
  color: #fff;
  opacity: 0;
  transform: scale(0) rotate(-20deg);
  transition:
    opacity 0.25s ease,
    transform 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  position: relative;
  z-index: 2;
  pointer-events: none;
}

.checkmark path {
  stroke-dasharray: 28;
  stroke-dashoffset: 28;
  transition: stroke-dashoffset 0.5s cubic-bezier(0.65, 0, 0.35, 1) 0.15s;
}

/* ---------- label text ---------- */
.label-text {
  font-family:
    "Segoe UI",
    system-ui,
    -apple-system,
    sans-serif;
  font-size: 15px;
  font-weight: 500;
  color: var(--clr-idle);
  letter-spacing: 0.3px;
  transition: color 0.35s;
  user-select: none;
}

/* ======================
   PARTICLES
   ====================== */
.particle {
  position: absolute;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--clr-spark);
  opacity: 0;
  pointer-events: none;
  top: 50%;
  left: 50%;
  z-index: 3;
}

/* ======================
   SHOCKWAVE RINGS
   ====================== */
.ring {
  position: absolute;
  inset: -8px;
  border-radius: 50%;
  border: 2px solid var(--clr-glow);
  opacity: 0;
  pointer-events: none;
  z-index: 1;
}

/* ======================
   SPARK LINES
   ====================== */
.spark {
  position: absolute;
  width: 2px;
  height: 10px;
  background: linear-gradient(to top, var(--clr-spark), transparent);
  opacity: 0;
  top: 50%;
  left: 50%;
  transform-origin: center center;
  pointer-events: none;
  border-radius: 2px;
  z-index: 3;
}

/* Position sparks in a radial pattern */
.s1 {
  transform: rotate(0deg) translateY(-2px);
}

.s2 {
  transform: rotate(45deg) translateY(-2px);
}

.s3 {
  transform: rotate(90deg) translateY(-2px);
}

.s4 {
  transform: rotate(135deg) translateY(-2px);
}

.s5 {
  transform: rotate(180deg) translateY(-2px);
}

.s6 {
  transform: rotate(225deg) translateY(-2px);
}

.s7 {
  transform: rotate(270deg) translateY(-2px);
}

.s8 {
  transform: rotate(315deg) translateY(-2px);
}

/* ==========================================
   ✅ CHECKED STATE — the supernova ignites
   ========================================== */
.cosmic-checkbox input:checked ~ .checkbox-container .checkbox-box {
  border-color: var(--clr-active);
  /* Background moves to .checkbox-bg */
  transform: scale(1);
  animation: box-pulse 0.5s ease;
}

@keyframes box-pulse {
  0% {
    transform: scale(1);
  }

  30% {
    transform: scale(0.85);
  }

  60% {
    transform: scale(1.15);
  }

  100% {
    transform: scale(1);
  }
}

/* checkmark draws in */
.cosmic-checkbox input:checked ~ .checkbox-container .checkmark {
  opacity: 1;
  transform: scale(1) rotate(0deg);
}

.cosmic-checkbox input:checked ~ .checkbox-container .checkmark path {
  stroke-dashoffset: 0;
}

/* label lights up */
.cosmic-checkbox input:checked ~ .checkbox-container .label-text {
  color: var(--clr-core);
}

/* ---- Particle explosion ---- */
.cosmic-checkbox input:checked ~ .checkbox-container .p1 {
  animation: particle-fly 0.65s ease-out forwards;
  --angle: -45deg;
  --dist: 22px;
  --clr: #f0abfc;
}

.cosmic-checkbox input:checked ~ .checkbox-container .p2 {
  animation: particle-fly 0.6s 0.05s ease-out forwards;
  --angle: -90deg;
  --dist: 26px;
  --clr: #c084fc;
}

.cosmic-checkbox input:checked ~ .checkbox-container .p3 {
  animation: particle-fly 0.55s 0.08s ease-out forwards;
  --angle: 0deg;
  --dist: 20px;
  --clr: #e879f9;
}

.cosmic-checkbox input:checked ~ .checkbox-container .p4 {
  animation: particle-fly 0.7s 0.03s ease-out forwards;
  --angle: 45deg;
  --dist: 24px;
  --clr: #d946ef;
}

.cosmic-checkbox input:checked ~ .checkbox-container .p5 {
  animation: particle-fly 0.5s 0.1s ease-out forwards;
  --angle: 135deg;
  --dist: 18px;
  --clr: #a78bfa;
}

.cosmic-checkbox input:checked ~ .checkbox-container .p6 {
  animation: particle-fly 0.65s 0.06s ease-out forwards;
  --angle: -135deg;
  --dist: 23px;
  --clr: #818cf8;
}

@keyframes particle-fly {
  0% {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(var(--angle)) translateY(0) scale(1);
    background: var(--clr);
  }

  60% {
    opacity: 1;
    transform: translate(-50%, -50%) rotate(var(--angle))
      translateY(calc(var(--dist) * -1)) scale(1.1);
  }

  100% {
    opacity: 0;
    transform: translate(-50%, -50%) rotate(var(--angle))
      translateY(calc(var(--dist) * -1.4)) scale(0);
  }
}

/* ---- Shockwave rings ---- */
.cosmic-checkbox input:checked ~ .checkbox-container .ring-1 {
  animation: shockwave 0.7s ease-out forwards;
}

.cosmic-checkbox input:checked ~ .checkbox-container .ring-2 {
  animation: shockwave 0.7s 0.12s ease-out forwards;
}

.cosmic-checkbox input:checked ~ .checkbox-container .ring-3 {
  animation: shockwave 0.7s 0.24s ease-out forwards;
}

@keyframes shockwave {
  0% {
    opacity: 0.7;
    transform: scale(0.5);
    border-color: var(--clr-glow);
  }

  50% {
    opacity: 0.4;
    border-color: var(--clr-spark);
  }

  100% {
    opacity: 0;
    transform: scale(2.2);
    border-color: transparent;
  }
}

/* ---- Spark lines burst ---- */
.cosmic-checkbox input:checked ~ .checkbox-container .s1 {
  animation: spark-burst 0.5s 0.05s ease-out forwards;
  --rot: 0deg;
}

.cosmic-checkbox input:checked ~ .checkbox-container .s2 {
  animation: spark-burst 0.45s 0.08s ease-out forwards;
  --rot: 45deg;
}

.cosmic-checkbox input:checked ~ .checkbox-container .s3 {
  animation: spark-burst 0.5s 0.03s ease-out forwards;
  --rot: 90deg;
}

.cosmic-checkbox input:checked ~ .checkbox-container .s4 {
  animation: spark-burst 0.55s 0.1s ease-out forwards;
  --rot: 135deg;
}

.cosmic-checkbox input:checked ~ .checkbox-container .s5 {
  animation: spark-burst 0.5s 0.06s ease-out forwards;
  --rot: 180deg;
}

.cosmic-checkbox input:checked ~ .checkbox-container .s6 {
  animation: spark-burst 0.45s 0.09s ease-out forwards;
  --rot: 225deg;
}

.cosmic-checkbox input:checked ~ .checkbox-container .s7 {
  animation: spark-burst 0.5s 0.04s ease-out forwards;
  --rot: 270deg;
}

.cosmic-checkbox input:checked ~ .checkbox-container .s8 {
  animation: spark-burst 0.55s 0.07s ease-out forwards;
  --rot: 315deg;
}

@keyframes spark-burst {
  0% {
    opacity: 1;
    transform: rotate(var(--rot)) translateY(-4px) scaleY(0.5);
  }

  50% {
    opacity: 0.9;
    transform: rotate(var(--rot)) translateY(-20px) scaleY(1.2);
    background: linear-gradient(to top, var(--clr-active), transparent);
  }

  100% {
    opacity: 0;
    transform: rotate(var(--rot)) translateY(-30px) scaleY(0.3);
  }
}

/* ======================
   IDLE BREATHING GLOW
   A subtle ambient pulse
   when unchecked
   ====================== */
.checkbox-box::before {
  content: "";
  position: absolute;
  inset: -3px;
  border-radius: 10px;
  background: radial-gradient(
    circle,
    rgba(168, 85, 247, 0.12),
    transparent 70%
  );
  opacity: 0;
  animation: idle-breathe 3s ease-in-out infinite;
  pointer-events: none;
}

@keyframes idle-breathe {
  0%,
  100% {
    opacity: 0;
    transform: scale(0.95);
  }

  50% {
    opacity: 1;
    transform: scale(1.15);
  }
}

/* after check, the glow becomes steady */
.cosmic-checkbox input:checked ~ .checkbox-container .checkbox-box::before {
  animation: none;
  opacity: 0.6;
  transform: scale(1.2);
  background: radial-gradient(
    circle,
    rgba(168, 85, 247, 0.25),
    transparent 70%
  );
  transition:
    opacity 0.5s,
    transform 0.5s;
}

/* ======================
   AFTER-GLOW — persistent
   shimmer on checked state
   ====================== */
.checkbox-box::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 8px;
  opacity: 0;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.25) 0%,
    transparent 50%,
    rgba(255, 255, 255, 0.1) 100%
  );
  pointer-events: none;
  transition: opacity 0.4s 0.2s;
}

.cosmic-checkbox input:checked ~ .checkbox-container .checkbox-box::after {
  opacity: 1;
}

/* ======================
   UNCHECKED TRANSITION
   smooth return
   ====================== */
.cosmic-checkbox input:not(:checked) ~ .checkbox-container .checkbox-box {
  background: transparent;
  box-shadow: none;
}

.cosmic-checkbox input:not(:checked) ~ .checkbox-container .checkmark {
  opacity: 0;
  transform: scale(0) rotate(-20deg);
}

.cosmic-checkbox input:not(:checked) ~ .checkbox-container .checkmark path {
  stroke-dashoffset: 28;
}

/* ======================
   FOCUS-VISIBLE (a11y)
   ====================== */
.cosmic-checkbox input:focus-visible ~ .checkbox-container .checkbox-box {
  outline: 2px solid var(--clr-glow);
  outline-offset: 3px;
}