/* ============================================
   Hidden Checkbox Toggle
   ============================================ */
.diaphragm-toggle {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

/* ============================================
   Main Container
   ============================================ */
.container {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ============================================
   Explore Button - Circular
   ============================================ */
.explore-btn {
  position: absolute;
  z-index: 200;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  cursor: pointer;
  user-select: none;
  pointer-events: auto;

  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.25rem;

  width: 140px;
  height: 140px;
  background: linear-gradient(135deg, var(--color-glow-primary) 0%, var(--color-glow-tertiary) 100%);
  border: 3px solid var(--color-accent);
  border-radius: 50%;

  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-bg-primary);
  text-transform: uppercase;
  letter-spacing: 0.2em;

  transition: all var(--transition-fast);
  animation: pulse 2.5s ease-in-out infinite;
}

.explore-btn .btn-hint {
  font-size: 0.5rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0.1em;
  opacity: 0.85;
}

.explore-btn:hover {
  transform: translate(-50%, -50%) scale(1.1);
  box-shadow: 0 0 60px rgba(0, 212, 255, 0.8),
              0 0 100px rgba(168, 85, 247, 0.6),
              inset 0 2px 12px rgba(255, 255, 255, 0.4),
              inset 0 -2px 12px rgba(0, 0, 0, 0.4);
  border-color: var(--color-accent-hover);
}

@keyframes pulse {
  0%, 100% {
    box-shadow: 0 0 40px rgba(0, 212, 255, 0.6),
                0 0 80px rgba(168, 85, 247, 0.4),
                inset 0 2px 8px rgba(255, 255, 255, 0.3),
                inset 0 -2px 8px rgba(0, 0, 0, 0.3);
  }
  50% {
    box-shadow: 0 0 60px rgba(0, 212, 255, 0.8),
                0 0 100px rgba(168, 85, 247, 0.6),
                inset 0 2px 12px rgba(255, 255, 255, 0.4),
                inset 0 -2px 12px rgba(0, 0, 0, 0.4);
  }
}

/* Hide button when checked */
.diaphragm-toggle:checked ~ .container .explore-btn {
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, -50%) scale(0.8);
  transition: opacity 0.2s ease-out, transform 0.2s ease-out;
}

/* ============================================
   Canvas Iris Diaphragm
   ============================================ */
.iris-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 100;
  pointer-events: none;
  transition: opacity var(--transition-medium), visibility var(--transition-medium);
}

/* Hide canvas when button is clicked */
.diaphragm-toggle:checked ~ .container .iris-canvas {
  opacity: 0;
  visibility: hidden;
}