/* Button Styles for Canvass Global App - No box-shadow */

/* Base button styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  text-align: center;
  text-decoration: none;
  white-space: nowrap;
  vertical-align: middle;
  cursor: pointer;
  user-select: none;
  border: var(--border-width) solid transparent;
  border-radius: var(--border-radius);
  transition: all var(--transition-base);
  position: relative;
  background-color: transparent;
}

/* Button sizes */
.btn-sm {
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: var(--font-size-lg);
}

/* Button variants */
.btn-primary {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: var(--text-white);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--bg-primary);
  border-color: var(--border-color);
  color: var(--text-primary);
}

.btn-secondary:hover {
  background-color: var(--bg-secondary);
  border-color: var(--border-color-dark);
}

.btn-success {
  background-color: var(--success-color);
  border-color: var(--success-color);
  color: var(--text-white);
}

.btn-success:hover {
  background-color: var(--success-hover);
  border-color: var(--success-hover);
  transform: translateY(-1px);
}

.btn-danger {
  background-color: var(--danger-color);
  border-color: var(--danger-color);
  color: var(--text-white);
}

.btn-danger:hover {
  background-color: var(--danger-hover);
  border-color: var(--danger-hover);
  transform: translateY(-1px);
}

.btn-warning {
  background-color: var(--warning-color);
  border-color: var(--warning-color);
  color: var(--text-white);
}

.btn-warning:hover {
  background-color: var(--warning-hover);
  border-color: var(--warning-hover);
  transform: translateY(-1px);
}

/* Outline variants */
.btn-outline-primary {
  background-color: transparent;
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.btn-outline-primary:hover {
  background-color: var(--primary-color);
  border-color: var(--primary-color);
  color: var(--text-white);
}

.btn-outline-secondary {
  background-color: transparent;
  border-color: var(--gray-400);
  color: var(--text-secondary);
}

.btn-outline-secondary:hover {
  background-color: var(--gray-400);
  border-color: var(--gray-400);
  color: var(--text-white);
}

.btn-outline-danger {
  background-color: transparent;
  border-color: var(--danger-color);
  color: var(--danger-color);
}

.btn-outline-danger:hover {
  background-color: var(--danger-color);
  border-color: var(--danger-color);
  color: var(--text-white);
}

/* Ghost button (no border) */
.btn-ghost {
  background-color: transparent;
  border-color: transparent;
  color: var(--text-primary);
}

.btn-ghost:hover {
  background-color: var(--bg-secondary);
  border-color: transparent;
}

/* Link button */
.btn-link {
  background-color: transparent;
  border-color: transparent;
  color: var(--primary-color);
  padding: 0;
}

.btn-link:hover {
  color: var(--primary-hover);
  text-decoration: underline;
}

/* Raised button effect (using border instead of shadow) */
.btn-raised {
  border-bottom-width: var(--border-width-thicker);
}

.btn-raised:active {
  border-bottom-width: var(--border-width);
  transform: translateY(2px);
}

/* Full width button */
.btn-block {
  display: flex;
  width: 100%;
}

/* Button states */
.btn:disabled,
.btn.disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none !important;
}

/* Loading state */
.btn-loading {
  color: transparent;
  position: relative;
  pointer-events: none;
}

.btn-loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin-left: -8px;
  margin-top: -8px;
  border: 2px solid currentColor;
  border-radius: 50%;
  border-right-color: transparent;
  animation: btn-spinner 0.75s linear infinite;
}

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

/* Button with icon */
.btn-icon {
  padding: var(--spacing-sm);
}

.btn-icon.btn-sm {
  padding: var(--spacing-xs);
}

.btn-icon.btn-lg {
  padding: var(--spacing-md);
}

/* Icon inside button */
.btn svg,
.btn i {
  width: 1em;
  height: 1em;
  vertical-align: -0.125em;
}

.btn svg + span,
.btn i + span {
  margin-left: var(--spacing-xs);
}

.btn span + svg,
.btn span + i {
  margin-left: var(--spacing-xs);
}

/* Button group */
.btn-group {
  display: inline-flex;
  vertical-align: middle;
}

.btn-group > .btn {
  position: relative;
  flex: 0 1 auto;
}

.btn-group > .btn:not(:first-child) {
  margin-left: calc(var(--border-width) * -1);
  border-top-left-radius: 0;
  border-bottom-left-radius: 0;
}

.btn-group > .btn:not(:last-child) {
  border-top-right-radius: 0;
  border-bottom-right-radius: 0;
}

.btn-group > .btn:hover,
.btn-group > .btn:focus,
.btn-group > .btn:active {
  z-index: 1;
}

/* Vertical button group */
.btn-group-vertical {
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
}

.btn-group-vertical > .btn {
  width: 100%;
}

.btn-group-vertical > .btn:not(:first-child) {
  margin-top: calc(var(--border-width) * -1);
  margin-left: 0;
  border-top-left-radius: 0;
  border-top-right-radius: 0;
}

.btn-group-vertical > .btn:not(:last-child) {
  border-bottom-left-radius: 0;
  border-bottom-right-radius: 0;
}

/* Floating Action Button (FAB) */
.btn-fab {
  width: 56px;
  height: 56px;
  padding: 0;
  border-radius: var(--border-radius-round);
  font-size: var(--font-size-xl);
}

.btn-fab.btn-sm {
  width: 40px;
  height: 40px;
  font-size: var(--font-size-lg);
}

/* Focus styles for accessibility */
.btn:focus-visible {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}