@import url('../core/design-tokens.css');
/**
 * Standardized Button Component
 * Replaces all button implementations across the application
 * Uses design tokens for consistency
 */

/* ========================================
   BASE BUTTON STYLES
   ======================================== */

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

  /* Typography */
  font-family: 'Inter', sans-serif;
  font-weight: var(--font-weight-semibold);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1;

  /* Interaction */
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  user-select: none;

  /* Accessibility */
  outline-offset: var(--focus-ring-offset);
}

.btn:focus {
  outline: none;
}

.btn:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
  box-shadow: 0 0 0 6px rgba(0, 136, 122, 0.15);
}

/* High contrast mode support */
@media (prefers-contrast: high) {
  .btn:focus-visible {
    outline-width: 4px;
    outline-offset: 3px;
  }
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ========================================
   SIZE VARIANTS
   ======================================== */

.btn-sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
  border-radius: var(--radius-md);
  min-height: var(--touch-target-min);
}

.btn-md {
  padding: var(--space-3) var(--space-4);
  font-size: var(--font-size-base);
  border-radius: var(--radius-md);
  min-height: var(--touch-target-comfortable);
}

.btn-lg {
  padding: var(--space-4) var(--space-6);
  font-size: var(--font-size-md);
  border-radius: var(--radius-lg);
  min-height: 56px;
}

/* ========================================
   COLOR VARIANTS
   ======================================== */

/* Primary Button - Style Guide Compliant */
.btn-primary {
  background: linear-gradient(135deg, #00887A 0%, #006B5E 100%);
  color: #ffffff;
  border: none;
  box-shadow: 0 2px 8px rgba(0, 136, 122, 0.3);
}

.btn-primary:hover:not(:disabled) {
  background: linear-gradient(135deg, #006B5E 0%, #005549 100%);
  box-shadow: 0 4px 12px rgba(0, 136, 122, 0.4);
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(0, 136, 122, 0.3);
}

.btn-primary:disabled {
  background: #94a3b8;
  cursor: not-allowed;
  opacity: 0.6;
}

.btn-primary:focus-visible {
  outline: 3px solid #00887A;
  outline-offset: 2px;
}

/* Secondary Button - Style Guide Compliant */
.btn-secondary {
  background: transparent;
  color: #6E6864;  /* ADA compliant grey - 4.5:1 contrast ratio */
  border: 2px solid #6E6864;
}

.btn-secondary:hover:not(:disabled) {
  background: #f3f4f6;
  border-color: #423E3B;  /* Darker grey border on hover - 11.57:1 contrast */
  color: #423E3B;
}

.btn-secondary:active:not(:disabled) {
  transform: translateY(0);
}

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

.btn-secondary:focus-visible {
  outline: 3px solid #00887A;
  outline-offset: 2px;
}

/* Icon Sizing - Style Guide Compliant */
.btn-primary .material-icons,
.btn-secondary .material-icons,
.btn .material-icons {
  font-size: 18px;
}

/* Ghost Button */
.btn-ghost {
  background: transparent;
  color: var(--color-text-on-dark);
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.btn-ghost:hover:not(:disabled) {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.5);
}

/* Success Button */
.btn-success {
  background: var(--color-success);
  color: var(--color-text-on-primary);
}

.btn-success:hover:not(:disabled) {
  background: var(--color-success-hover);
  transform: translateY(-1px);
}

/* Danger Button */
.btn-danger {
  background: var(--color-danger);
  color: var(--color-text-on-primary);
}

.btn-danger:hover:not(:disabled) {
  background: var(--color-danger-hover);
  transform: translateY(-1px);
}

/* Icon Button */
.btn-icon {
  padding: var(--space-3);
  min-width: var(--touch-target-min);
  min-height: var(--touch-target-min);
  border-radius: var(--radius-full);
}

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

.btn.loading::after {
  content: '';
  position: absolute;
  width: 16px;
  height: 16px;
  top: 50%;
  left: 50%;
  margin: -8px 0 0 -8px;
  border: 2px solid currentColor;
  border-radius: 50%;
  border-top-color: transparent;
  animation: spinner 0.6s linear infinite;
}

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

/* Legacy Support */
.submit-exercise-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  background: var(--color-success);
  color: var(--color-text-on-primary);
  border: none;
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-semibold);
  min-height: var(--touch-target-comfortable);
  cursor: pointer;
  transition: all var(--transition-base);
}

.submit-exercise-btn:hover {
  background: var(--color-success-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.submit-exercise-btn:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}