.ivt-btn{
  --border: #1d2b53;
  --text: #1d2b53;
  --bg: #ffffff;
  --radius: 14px;
  --padY: 14px;
  --padX: 34px;

  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;

  padding: var(--padY) var(--padX);
  padding-left: calc(var(--padX) + 30px);

  border-radius: var(--radius);
  background: var(--bg);
  color: var(--text);
  border: 2px solid var(--border);

  text-decoration: none;
  font-weight: 700;
  font-size: 18px;
  line-height: 1;

  cursor: pointer;
  user-select: none;

  overflow: hidden;
  transform: translateZ(0);
  box-shadow: 0 10px 20px rgba(0,0,0,.06);

  transition: transform .38s cubic-bezier(.22,1,.36,1), filter .2s ease;
}

/* Hover zoom */
.ivt-btn:hover{
  transform: scale(1.07);
  filter: brightness(1.02);
}

/* Mantener mismo tamaño al hacer click */
.ivt-btn.is-running{
  transform: scale(1.07);
  filter: brightness(1.02);
}

/* Icon */
.ivt-icon-wrap{
  position: absolute;
  left: var(--padX);
  top: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transform: translateY(-50%);
  transition: left .55s cubic-bezier(.22,1,.36,1),
              transform .55s cubic-bezier(.22,1,.36,1);
}

.ivt-icon{
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.ivt-label{
  transition: opacity .42s cubic-bezier(.22,1,.36,1),
              transform .42s cubic-bezier(.22,1,.36,1);
}

/* Hover behavior */
.ivt-btn:hover .ivt-label{
  opacity: 0;
  transform: translateX(6px);
}

.ivt-btn:hover .ivt-icon-wrap{
  left: 50%;
  transform: translate(-50%, -50%);
}

/* Click state maintains centered cart + hidden text */
.ivt-btn.is-running .ivt-label{
  opacity: 0;
}

.ivt-btn.is-running .ivt-icon-wrap{
  left: 50%;
  transform: translate(-50%, -50%);
}

@media (prefers-reduced-motion: reduce){
  .ivt-btn,
  .ivt-label,
  .ivt-icon-wrap{
    transition: none !important;
  }
}