.specular-button {
  --sb-radius: 10px;
  --sb-tint: #ffffff;
  --sb-tint-opacity: 0;
  --sb-blur: 0px;
  --sb-text-color: #ffffff;

  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(0, 240, 255, 0.4);
  margin: 0;
  font-family: inherit;
  font-weight: 700;
  letter-spacing: 0.01em;
  line-height: 1;
  color: var(--sb-text-color);
  background: var(--gradient-accent, linear-gradient(135deg, #0066FF 0%, #00F0FF 100%));
  border-radius: var(--sb-radius);
  backdrop-filter: blur(var(--sb-blur));
  -webkit-backdrop-filter: blur(var(--sb-blur));
  box-shadow: 0 4px 20px rgba(0, 102, 255, 0.35), inset 0 0 12px rgba(0, 240, 255, 0.3);
  cursor: pointer;
  outline: none;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.2s ease, border-color 0.2s ease;
  overflow: visible;
}

.specular-button:hover {
  transform: translateY(-2px);
  border-color: #00F0FF;
  box-shadow: 0 8px 30px rgba(0, 240, 255, 0.6), inset 0 0 18px rgba(0, 240, 255, 0.5);
  color: #FFFFFF;
}

.specular-button:active {
  transform: scale(0.97);
}

.specular-button:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--sb-text-color) 60%, transparent);
  outline-offset: 3px;
}

.specular-button:disabled {
  opacity: 0.55;
  cursor: default;
}

.specular-button:disabled:active {
  transform: none;
}

.specular-button--sm {
  font-size: 0.85rem;
  padding: 10px 22px;
}

.specular-button--md {
  font-size: 0.95rem;
  padding: 12px 26px;
}

.specular-button--lg {
  font-size: 0.95rem;
  padding: 14px 28px;
}

/* Canvas extends past the button so the rim glow can bleed outside the edge */
.specular-button__fx {
  position: absolute;
  inset: -20px;
  pointer-events: none;
  z-index: 1;
}

.specular-button__fx canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.specular-button__label {
  position: relative;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}