.btn {
  
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  vertical-align: middle;

  
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--fw-emph);
  line-height: 1;
  letter-spacing: var(--tracking-tight);
  white-space: nowrap;
  text-decoration: none;
  text-align: center;

  
  padding: 10px 20px;
  min-height: 40px;

  
  background: transparent;
  color: var(--ink-900);
  border: var(--border-base);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);

  
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition:
    transform var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-in-out),
    color var(--duration-fast) var(--ease-in-out),
    border-color var(--duration-fast) var(--ease-in-out);
}


button.btn {
  appearance: none;
  -webkit-appearance: none;
  margin: 0;
  font: inherit;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  font-weight: var(--fw-emph);
  line-height: 1;
}






@media (hover: hover) and (pointer: fine) {
  .btn:hover:not(:disabled):not(.is-disabled):not(.is-loading) {
    transform: translate(-1px, -1px);
    box-shadow: var(--shadow-lg);
  }
}

.btn:active:not(:disabled):not(.is-disabled):not(.is-loading) {
  transform: translate(2px, 2px);
  box-shadow: none;
}

.btn:focus-visible {
  outline: 3px solid var(--pink-300);
  outline-offset: 3px;
}

.btn:disabled,
.btn.is-disabled,
.btn[aria-disabled="true"] {
  opacity: 0.45;
  cursor: not-allowed;
}






.btn-primary {
  background: var(--pink-500);
  color: var(--paper);
}
@media (hover: hover) and (pointer: fine) {
  .btn-primary:hover:not(:disabled):not(.is-disabled) {
    background: var(--pink-600);
  }
}

.btn-secondary {
  background: var(--paper);
  color: var(--ink-900);
}
@media (hover: hover) and (pointer: fine) {
  .btn-secondary:hover:not(:disabled):not(.is-disabled) {
    background: var(--ink-50);
  }
}

.btn-dark {
  background: var(--ink-900);
  color: var(--paper);
}
@media (hover: hover) and (pointer: fine) {
  .btn-dark:hover:not(:disabled):not(.is-disabled) {
    background: var(--ink-700);
  }
}

.btn-success {
  background: var(--green-500);
  color: var(--paper);
}
@media (hover: hover) and (pointer: fine) {
  .btn-success:hover:not(:disabled):not(.is-disabled) {
    background: var(--green-600);
  }
}

.btn-danger {
  background: var(--red-500);
  color: var(--paper);
}
@media (hover: hover) and (pointer: fine) {
  .btn-danger:hover:not(:disabled):not(.is-disabled) {
    background: var(--red-600);
  }
}

.btn-warning {
  background: var(--yellow-500);
  color: var(--ink-900);
}
@media (hover: hover) and (pointer: fine) {
  .btn-warning:hover:not(:disabled):not(.is-disabled) {
    background: var(--yellow-300);
  }
}


.btn-ghost {
  background: transparent;
  color: var(--ink-700);
  border-color: transparent;
  box-shadow: none;
}
@media (hover: hover) and (pointer: fine) {
  .btn-ghost:hover:not(:disabled):not(.is-disabled) {
    background: var(--ink-50);
    transform: none;
    box-shadow: none;
  }
}
.btn-ghost:active:not(:disabled):not(.is-disabled) {
  background: var(--ink-100);
  transform: none;
  box-shadow: none;
}






.btn-xs {
  padding: 4px 10px;
  min-height: 26px;
  font-size: var(--text-sm);          
  font-weight: var(--fw-emph);
  border-width: var(--border-width-thin);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  gap: var(--space-1);
}
@media (hover: hover) and (pointer: fine) {
  .btn-xs:hover:not(:disabled):not(.is-disabled):not(.is-loading) {
    box-shadow: var(--shadow-md);
  }
}

.btn-sm {
  padding: 6px 14px;
  min-height: 32px;
  font-size: var(--text-base);        
  gap: var(--space-2);
}

.btn-lg {
  padding: 14px 28px;
  min-height: 52px;
  font-size: var(--text-lg);          
  font-weight: var(--fw-emph);   
  gap: var(--space-3);
}
@media (hover: hover) and (pointer: fine) {
  .btn-lg:hover:not(:disabled):not(.is-disabled):not(.is-loading) {
    box-shadow: var(--shadow-xl);
  }
}

.btn-xl {
  padding: 18px 36px;
  min-height: 62px;
  font-size: var(--text-xl);          
  font-weight: var(--fw-emph);
  border-width: var(--border-width-thick);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  gap: var(--space-3);
}
@media (hover: hover) and (pointer: fine) {
  .btn-xl:hover:not(:disabled):not(.is-disabled):not(.is-loading) {
    box-shadow: var(--shadow-2xl);
  }
}







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


.btn-icon {
  padding: 0;
  width: 40px;
  min-width: 40px;
  gap: 0;
}
.btn-icon.btn-xs { width: 26px; min-width: 26px; padding: 0; }
.btn-icon.btn-sm { width: 32px; min-width: 32px; padding: 0; }
.btn-icon.btn-lg { width: 52px; min-width: 52px; padding: 0; }
.btn-icon.btn-xl { width: 62px; min-width: 62px; padding: 0; }


.btn-pill {
  border-radius: var(--radius-full);
}


.btn.is-loading {
  pointer-events: none;
  color: transparent !important;
  position: relative;
}
.btn.is-loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 16px;
  margin: -8px 0 0 -8px;
  border-radius: 50%;
  border: 2px solid currentColor;
  border-top-color: transparent;
  color: var(--ink-900);
  animation: btn-spin 0.7s linear infinite;
}
.btn-primary.is-loading::after,
.btn-dark.is-loading::after,
.btn-success.is-loading::after,
.btn-danger.is-loading::after {
  color: var(--paper);
}
.btn-xs.is-loading::after  { width: 12px; height: 12px; margin: -6px 0 0 -6px; border-width: 1.5px; }
.btn-lg.is-loading::after  { width: 20px; height: 20px; margin: -10px 0 0 -10px; }
.btn-xl.is-loading::after  { width: 24px; height: 24px; margin: -12px 0 0 -12px; border-width: 3px; }

@keyframes btn-spin {
  to { transform: rotate(360deg); }
}






.btn > svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
}
.btn-xs > svg { width: 12px; height: 12px; }
.btn-sm > svg { width: 14px; height: 14px; }
.btn-lg > svg { width: 18px; height: 18px; }
.btn-xl > svg { width: 22px; height: 22px; }






.btn-group {
  display: inline-flex;
  align-items: stretch;
  gap: 0;
}
.btn-group .btn {
  border-radius: 0;
}
.btn-group .btn:first-child {
  border-top-left-radius: var(--radius-md);
  border-bottom-left-radius: var(--radius-md);
}
.btn-group .btn:last-child {
  border-top-right-radius: var(--radius-md);
  border-bottom-right-radius: var(--radius-md);
}
.btn-group .btn + .btn {
  margin-left: calc(-1 * var(--border-width-base));
}
.btn-group .btn.is-active {
  z-index: 1;
}
@media (hover: hover) and (pointer: fine) {
  .btn-group .btn:hover {
    z-index: 1;
  }
}






@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .btn {
    -webkit-font-smoothing: antialiased;
  }
}






@media (max-width: 480px) {
  .btn { box-shadow: var(--shadow-sm); }
  @media (hover: hover) and (pointer: fine) {
    .btn:hover:not(:disabled):not(.is-disabled):not(.is-loading) {
      box-shadow: var(--shadow-md);
    }
  }
  .btn-lg { box-shadow: var(--shadow-md); }
  @media (hover: hover) and (pointer: fine) {
    .btn-lg:hover:not(:disabled):not(.is-disabled):not(.is-loading) {
      box-shadow: var(--shadow-lg);
    }
  }
  .btn-xl { box-shadow: var(--shadow-lg); }
  @media (hover: hover) and (pointer: fine) {
    .btn-xl:hover:not(:disabled):not(.is-disabled):not(.is-loading) {
      box-shadow: var(--shadow-xl);
    }
  }
}