/**
 * Button component styles
 */

/* Base Button */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  transition: var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
}

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

.btn-secondary:hover:not(:disabled) {
  background-color: var(--bg-hover);
}

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

.btn-success:hover:not(:disabled) {
  background-color: #059669;
}

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

.btn-danger:hover:not(:disabled) {
  background-color: #dc2626;
}

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

.btn-warning:hover:not(:disabled) {
  background-color: #d97706;
}

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

.btn-outline:hover:not(:disabled) {
  background-color: var(--color-primary);
  color: var(--text-inverse);
}

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

.btn-ghost:hover:not(:disabled) {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

/* Button Sizes */
.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--font-size-lg);
}

/* Icon Button */
.btn-icon {
  padding: var(--space-2);
  min-width: 40px;
  min-height: 40px;
}

.btn-icon .icon {
  font-size: var(--font-size-xl);
}

/* Button Group */
.btn-group {
  display: inline-flex;
  gap: var(--space-2);
}

.btn-group-vertical {
  flex-direction: column;
  align-items: stretch;
}

/* Filter Buttons */
.filter-btn {
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-full);
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  transition: var(--transition-fast);
}

.filter-btn:hover:not(:disabled) {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

.filter-btn.active {
  background-color: var(--color-primary);
  color: var(--text-inverse);
  border-color: var(--color-primary);
}

.filter-btn:active:not(:disabled) {
  transform: scale(0.96);
  transition: transform var(--anim-micro);
}

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

.btn.loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  color: var(--text-inverse);
}

/* Icon Alignment */
.btn .icon {
  display: inline-flex;
  align-items: center;
  font-size: 1.2em;
}

/* Theme Toggle Specific */
#theme-toggle .icon-light,
[data-theme="dark"] #theme-toggle .icon-dark {
  display: inline-flex;
}

[data-theme="dark"] #theme-toggle .icon-light,
#theme-toggle .icon-dark {
  display: none;
}

/* Responsive */
@media (max-width: 768px) {
  .btn {
    padding: var(--space-3) var(--space-4);
    min-height: 44px; /* Touch-friendly */
  }
  
  .btn-sm {
    min-height: 36px;
  }
  
  .btn-lg {
    min-height: 52px;
  }
  
  .btn-icon {
    min-width: 44px;
    min-height: 44px;
  }
}