*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  margin: 0;
  background: #f8fafc;
  color: #0f172a;
}

.stage {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-content: center;
  align-items: center;
  gap: 40px 64px;
  min-height: 100vh;
  padding: 40px 20px;
  font-size: clamp(1rem, 0.5rem + 1.6vw, 1.75rem);
}

.demo {
  display: grid;
  justify-items: center;
  gap: 16px;
}

.demo-label {
  margin: 0;
  font-size: 0.875rem;
  color: #475569;
}

.demo-label code {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.8125rem;
  color: #0f172a;
}

@property --angle {
  syntax: "<angle>";
  inherits: true;
  initial-value: 0deg;
}

.ai-button {
  --angle: 0deg;
  --ai-blue: #3d7bfa;
  --ai-violet: #9a5cf6;
  --ai-pink: #ef4f98;
  --ai-amber: #f7a531;
  position: relative;
  isolation: isolate;
  display: inline-flex;
  padding: 0.1em;
  border: 0;
  border-radius: 0.8em;
  background: none;
  color: #ffffff;
  font: inherit;
  cursor: pointer;
  animation: ai-spin 4s linear infinite paused;
  transition: transform 0.2s ease;
}

.ai-button::before,
.ai-button::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  background: conic-gradient(from var(--angle), var(--ai-blue), var(--ai-violet), var(--ai-pink), var(--ai-amber), var(--ai-blue));
}

.ai-button::after {
  z-index: -2;
  filter: blur(0.75em);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.ai-button-inner {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  padding: 0.75em 1.35em 0.75em 1.1em;
  border-radius: 0.7em;
  background: #0f172a;
  font-weight: 600;
  line-height: 1.2;
}

.ai-button-icon {
  width: 1.6em;
  height: 1.6em;
  fill: currentColor;
  overflow: visible;
}

.spark {
  transform-box: fill-box;
  transform-origin: center;
  animation: ai-twinkle 1.8s ease-in-out infinite paused;
}

.spark-sm {
  animation-delay: -0.6s;
}

.spark-xs {
  animation-delay: -1.2s;
}

.ai-button:hover,
.ai-button:focus-visible,
.ai-button:hover .spark,
.ai-button:focus-visible .spark {
  animation-play-state: running;
}

.ai-button:hover::after,
.ai-button:focus-visible::after {
  opacity: 0.6;
}

.ai-button:hover:not([aria-busy="true"]) {
  transform: translateY(-1px);
}

.ai-button:active:not([aria-busy="true"]) {
  transform: scale(0.98);
}

.ai-button:focus-visible {
  outline: 2px solid #1d4ed8;
  outline-offset: 4px;
}

.ai-button[aria-busy="true"] {
  animation-duration: 1.6s;
  animation-play-state: running;
  cursor: progress;
}

.ai-button[aria-busy="true"] .spark {
  animation-play-state: running;
}

.ai-button[aria-busy="true"]::after {
  opacity: 0.6;
}

@keyframes ai-spin {
  to {
    --angle: 360deg;
  }
}

@keyframes ai-twinkle {
  0%, 100% {
    transform: scale(1) rotate(0deg);
    opacity: 1;
  }
  50% {
    transform: scale(0.55) rotate(45deg);
    opacity: 0.7;
  }
}

@media (prefers-reduced-motion: reduce) {
  .ai-button,
  .spark {
    animation: none;
  }

  .ai-button:hover:not([aria-busy="true"]) {
    transform: none;
  }
}

@media (forced-colors: active) {
  .ai-button {
    border: 2px solid ButtonText;
  }
}