/* ChamberAI Design System - Button Components */
/* Version 1.0.0 */

/* Base Button Styles */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 12px 16px;
  font-size: var(--font-size-base);
  font-weight: var(--font-semibold);
  line-height: 1.4;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.18s ease;
  font-family: var(--font-body);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
  vertical-align: middle;
  position: relative;
  overflow: hidden;
}

button, [role="button"] {
  font-family: inherit;
}

.button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.button:disabled,
.button.is-disabled {
  opacity: 0.6;
  cursor: not-allowed;
  pointer-events: none;
}

/* Button Size Variants */

.button--small {
  padding: 8px 12px;
  font-size: var(--font-size-xs);
  height: 32px;
  gap: 4px;
}

.button--small .button__icon {
  width: 16px;
  height: 16px;
}

.button--medium {
  padding: 12px 16px;
  font-size: var(--font-size-base);
  height: 40px;
  gap: 8px;
}

.button--medium .button__icon {
  width: 20px;
  height: 20px;
}

.button--large {
  padding: 16px 24px;
  font-size: var(--font-size-md);
  height: 48px;
  gap: 8px;
}

.button--large .button__icon {
  width: 24px;
  height: 24px;
}

/* Button Type Variants */

/* Primary Button - Blue, solid, main actions */
.button--primary {
  background-color: var(--color-primary);
  color: var(--color-text-inverse);
  border: none;
}

.button--primary:hover:not(:disabled):not(.is-disabled) {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}

.button--primary:active:not(:disabled):not(.is-disabled) {
  background-color: var(--color-primary-dark);
  transform: scale(0.98);
}

.button--primary:disabled,
.button--primary.is-disabled {
  background-color: var(--color-text-disabled);
  color: var(--color-text-secondary);
}

/* Secondary Button - Gray, outline, alternative actions */
.button--secondary {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.button--secondary:hover:not(:disabled):not(.is-disabled) {
  background-color: var(--color-bg-tertiary);
  border-color: var(--color-border-dark);
  box-shadow: var(--shadow-1);
}

.button--secondary:active:not(:disabled):not(.is-disabled) {
  background-color: var(--color-border-light);
  border-color: var(--color-border-dark);
}

.button--secondary:disabled,
.button--secondary.is-disabled {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-disabled);
  border-color: var(--color-border-light);
}

/* Danger Button - Red, solid, destructive actions */
.button--danger {
  background-color: var(--color-error);
  color: var(--color-text-inverse);
  border: none;
}

.button--danger:hover:not(:disabled):not(.is-disabled) {
  background-color: var(--color-error-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}

.button--danger:active:not(:disabled):not(.is-disabled) {
  background-color: var(--color-error-dark);
  transform: scale(0.98);
}

.button--danger:disabled,
.button--danger.is-disabled {
  background-color: var(--color-text-disabled);
  color: var(--color-text-secondary);
}

/* Success Button - Green, solid, positive actions */
.button--success {
  background-color: var(--color-success);
  color: var(--color-text-inverse);
  border: none;
}

.button--success:hover:not(:disabled):not(.is-disabled) {
  background-color: var(--color-success-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}

.button--success:active:not(:disabled):not(.is-disabled) {
  background-color: var(--color-success-dark);
  transform: scale(0.98);
}

.button--success:disabled,
.button--success.is-disabled {
  background-color: var(--color-text-disabled);
  color: var(--color-text-secondary);
}

/* Ghost Button - Transparent, colored text, minimal actions */
.button--ghost {
  background-color: transparent;
  color: var(--color-primary);
  border: none;
}

.button--ghost:hover:not(:disabled):not(.is-disabled) {
  background-color: var(--color-primary-50);
  box-shadow: none;
}

.button--ghost:active:not(:disabled):not(.is-disabled) {
  background-color: rgba(0, 102, 204, 0.15);
}

.button--ghost:disabled,
.button--ghost.is-disabled {
  color: var(--color-text-disabled);
}

/* Outline Button - Transparent, border, alternative style */
.button--outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 1px solid var(--color-primary);
}

.button--outline:hover:not(:disabled):not(.is-disabled) {
  background-color: var(--color-primary-50);
  border-color: var(--color-primary-dark);
}

.button--outline:active:not(:disabled):not(.is-disabled) {
  background-color: rgba(0, 102, 204, 0.15);
  border-color: var(--color-primary-dark);
}

.button--outline:disabled,
.button--outline.is-disabled {
  color: var(--color-text-disabled);
  border-color: var(--color-border-light);
}

/* Icon Button - Square, icon-only */
.button--icon {
  padding: 8px;
  width: 40px;
  height: 40px;
  gap: 0;
  border-radius: var(--radius-md);
}

.button--icon.button--small {
  padding: 6px;
  width: 32px;
  height: 32px;
}

.button--icon.button--large {
  padding: 12px;
  width: 48px;
  height: 48px;
}

.button--icon .button__icon {
  margin: 0;
}

/* Text Button - Minimal, text-only */
.button--text {
  background-color: transparent;
  color: var(--color-primary);
  border: none;
  padding: 4px 8px;
  height: auto;
}

.button--text:hover:not(:disabled):not(.is-disabled) {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

.button--text:active:not(:disabled):not(.is-disabled) {
  color: var(--color-primary-dark);
}

/* Button Content */

.button__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.button__text {
  display: inline;
}

/* Icon-only display */
.button--icon-only .button__text {
  display: none;
}

.button--icon-only .button__icon {
  margin: 0;
}

/* Button Loading State */

.button.is-loading {
  opacity: 0.7;
  pointer-events: none;
}

.button.is-loading .button__text {
  visibility: hidden;
  width: 0;
}

.button.is-loading::after {
  content: "";
  display: inline-block;
  width: 1em;
  height: 1em;
  margin: 0 4px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* Button Groups */

.button-group {
  display: inline-flex;
  gap: var(--space-2);
}

.button-group--vertical {
  flex-direction: column;
  gap: var(--space-2);
}

.button-group--block {
  display: flex;
  gap: var(--space-2);
}

.button-group--block .button {
  flex: 1;
}

/* Stacked Button Group (no gap) */
.button-group--stacked {
  gap: 0;
}

.button-group--stacked .button:not(:last-child) {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
  border-right: 1px solid rgba(0, 0, 0, 0.1);
}

.button-group--stacked .button:not(:first-child) {
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}

/* Responsive Button */
@media (max-width: 640px) {
  .button--large {
    padding: 12px 16px;
    font-size: var(--font-size-base);
    height: 40px;
  }

  .button-group--block {
    gap: var(--space-2);
  }

  .button-group--vertical {
    gap: var(--space-2);
  }
}

/* Button with Badge */
.button--with-badge {
  position: relative;
}

.button--with-badge::after {
  content: attr(data-badge);
  position: absolute;
  top: -8px;
  right: -8px;
  background-color: var(--color-error);
  color: white;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 10px;
  font-weight: bold;
}

/* Utility Classes */

.btn { @extend .button; }
.btn-primary { @extend .button, .button--primary; }
.btn-secondary { @extend .button, .button--secondary; }
.btn-danger { @extend .button, .button--danger; }
.btn-success { @extend .button, .button--success; }
.btn-ghost { @extend .button, .button--ghost; }
.btn-outline { @extend .button, .button--outline; }
.btn-icon { @extend .button, .button--icon; }
.btn-sm { @extend .button--small; }
.btn-md { @extend .button--medium; }
.btn-lg { @extend .button--large; }