.ui-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8rpx;
  border: none;
  padding: 0 32rpx;
  font-weight: 600;
  border-radius: 48rpx;
  line-height: 1;
  box-sizing: border-box;
  position: relative;
  overflow: hidden;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.ui-btn::after { border: none; }

.ui-btn:active:not(.is-disabled) {
  transform: scale(0.96);
}

.ui-btn--block {
  width: 100%;
  display: flex;
}

/* Sizes */
.ui-btn--sm { height: 64rpx; font-size: 26rpx; padding: 0 24rpx; }
.ui-btn--md { height: 80rpx; font-size: 30rpx; }
.ui-btn--lg { height: 96rpx; font-size: 34rpx; padding: 0 40rpx; }
.ui-btn--xl { height: 108rpx; font-size: 36rpx; padding: 0 48rpx; }

/* Variants */
.ui-btn--primary {
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #FFFFFF;
  box-shadow: 0 8rpx 24rpx rgba(var(--primary-rgb), 0.3);
}

.ui-btn--primary:active:not(.is-disabled) {
  box-shadow: 0 4rpx 12rpx rgba(var(--primary-rgb), 0.2);
}

.ui-btn--outline {
  background: transparent;
  color: var(--text-secondary);
  border: 2rpx solid rgba(var(--primary-rgb), 0.3);
}

.ui-btn--outline:active:not(.is-disabled) {
  background: var(--primary-bg);
  border-color: var(--primary);
  color: var(--primary);
}

.ui-btn--danger {
  background: rgba(var(--danger-rgb), 0.06);
  color: var(--danger);
  border: 2rpx solid rgba(var(--danger-rgb), 0.3);
}

.ui-btn--danger:active:not(.is-disabled) {
  background: rgba(var(--danger-rgb), 0.05);
  border-color: var(--danger);
}

.ui-btn--ghost {
  /* Use rgba on the theme's RGB triplet instead of --primary-bg (~5% alpha)
     so the soft secondary reads as colored rather than near-white. */
  background: rgba(var(--primary-rgb), 0.14);
  color: var(--primary);
  border: 2rpx solid rgba(var(--primary-rgb), 0.22);
}

.ui-btn--ghost:active:not(.is-disabled) {
  background: rgba(var(--primary-rgb), 0.22);
  border-color: rgba(var(--primary-rgb), 0.35);
}

.ui-btn.is-disabled {
  opacity: 0.5;
  pointer-events: none;
}

.ui-btn__icon {
  width: 1em;
  height: 1em;
  flex-shrink: 0;
}

.ui-btn__text {
  white-space: nowrap;
}

/* ---- ripple effect ---- */
.ui-btn::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
  transform: translate(-50%, -50%);
  transition: width 0.5s ease, height 0.5s ease, opacity 0.5s ease;
  opacity: 0;
  pointer-events: none;
}

.ui-btn--primary::before,
.ui-btn--ghost::before {
  background: rgba(255, 255, 255, 0.4);
}

.ui-btn--outline::before,
.ui-btn--danger::before {
  background: rgba(var(--primary-rgb, 255, 107, 53), 0.15);
}

.ui-btn:active::before {
  width: 400rpx;
  height: 400rpx;
  opacity: 1;
  transition: 0s;
}