/* Ai.Sunria animated button — standalone stylesheet */
.btn-ai-sunria {
  --ai-yellow-1: #efad21;
  --ai-yellow-2: #ffd60f;
  --ai-ink: #1a1a1a;

  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.3rem 1.25rem 0.3rem 0.3rem;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(45deg, var(--ai-yellow-1), var(--ai-yellow-2));
  color: var(--ai-ink);
  font-weight: 700;
  font-size: 1rem;
  line-height: 1;
  text-decoration: none;
  overflow: hidden;
  cursor: pointer;
  box-shadow: 0 1px 2px #3c40434d, 0 2px 6px 2px #3c404326,
              inset 0 -2px 6px #34343459;
  transition: transform 0.2s ease, box-shadow 0.3s ease;
}
.btn-ai-sunria:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(239, 173, 33, 0.55), 0 2px 6px 2px #3c404326,
              inset 0 -2px 6px #34343459;
  color: var(--ai-ink);
}
.btn-ai-sunria:active { transform: scale(0.96); }
.btn-ai-sunria:focus-visible { outline: 3px solid #fff; outline-offset: 3px; }

.btn-ai-sunria__icon {
  position: relative;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.14);
  flex-shrink: 0;
  transition: background 0.3s ease, transform 0.4s ease;
}
.btn-ai-sunria:hover .btn-ai-sunria__icon {
  background: var(--ai-ink);
  transform: rotate(-12deg) scale(1.08);
}
.btn-ai-sunria__spark {
  width: 20px;
  height: 20px;
  fill: var(--ai-ink);
  overflow: visible;
  animation: aiTwinkle 2.4s ease-in-out infinite;
  transition: fill 0.3s ease;
}
.btn-ai-sunria:hover .btn-ai-sunria__spark { fill: var(--ai-yellow-2); }
@keyframes aiTwinkle {
  0%, 100% { transform: scale(1) rotate(0); opacity: 1; }
  50%      { transform: scale(1.18) rotate(12deg); opacity: 0.75; }
}

.btn-ai-sunria__label {
  position: relative;
  display: block;
  height: 1.2em;
  overflow: hidden;
}
.btn-ai-sunria__label span {
  display: block;
  height: 1.2em;
  line-height: 1.2em;
  transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.btn-ai-sunria:hover .btn-ai-sunria__label span { transform: translateY(-100%); }

.btn-ai-sunria__arrow { transition: transform 0.3s ease; }
.btn-ai-sunria:hover .btn-ai-sunria__arrow { transform: translateX(4px); }

.btn-ai-sunria::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 35%, rgba(255,255,255,0.65) 50%, transparent 65%);
  transform: translateX(-120%);
  animation: aiShine 3.5s ease-in-out infinite;
  pointer-events: none;
}
@keyframes aiShine {
  0%, 60%   { transform: translateX(-120%); }
  85%, 100% { transform: translateX(120%); }
}

@media (prefers-reduced-motion: reduce) {
  .btn-ai-sunria::after,
  .btn-ai-sunria__spark { animation: none; }
  .btn-ai-sunria, .btn-ai-sunria * { transition: none; }
}