/**
 * Button Component
 * Unified button styles for Clevertech theme
 * 
 * Structure:
 * - Base styles (.btn)
 * - Variants (--primary, --secondary, --ghost)
 * - Sizes (--sm, --md, --lg, --full)
 * - States (:hover, :active, :disabled)
 * - WordPress compatibility layer
 */

/* ========================================
   Design Tokens (will move to core/tokens.css)
   ======================================== */
:root {
  /* Button Colors */
  --btn-primary-bg: #0066cc;
  --btn-primary-bg-hover: #0052a3;
  --btn-primary-text: #ffffff;
  
  --btn-secondary-bg: transparent;
  --btn-secondary-bg-hover: #0066cc;
  --btn-secondary-border: #0066cc;
  --btn-secondary-text: #0066cc;
  --btn-secondary-text-hover: #ffffff;
  
  --btn-ghost-bg: transparent;
  --btn-ghost-bg-hover: rgba(0, 102, 204, 0.1);
  --btn-ghost-text: #0066cc;
  
  /* Button Sizing */
  --btn-padding-sm: 8px 16px;
  --btn-padding-md: 12px 24px;
  --btn-padding-lg: 16px 32px;
  --btn-padding-xl: 20px 40px;
  
  --btn-font-size-sm: 14px;
  --btn-font-size-md: 16px;
  --btn-font-size-lg: 18px;
  
  /* Button Styling */
  --btn-border-radius: 4px;
  --btn-border-width: 2px;
  --btn-transition: all 0.3s ease;
  --btn-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  --btn-shadow-hover: 0 4px 8px rgba(0, 0, 0, 0.15);
}

/* ========================================
   Base Button Styles
   ======================================== */
.btn {
  /* Reset */
  appearance: none;
  border: none;
  background: none;
  margin: 0;
  padding: 0;
  
  /* Display */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  
  /* Typography */
  font-family: inherit;
  font-size: var(--btn-font-size-md);
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  
  /* Styling */
  padding: var(--btn-padding-md);
  border-radius: var(--btn-border-radius);
  transition: var(--btn-transition);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  
  /* Prevent text selection */
  user-select: none;
  -webkit-user-select: none;
}

/* Focus styles for accessibility */
.btn:focus-visible {
  outline: 3px solid var(--btn-primary-bg);
  outline-offset: 2px;
}

/* Disabled state */
.btn:disabled,
.btn[disabled],
.btn.is-disabled {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

/* ========================================
   Button Variants
   ======================================== */

/* Primary Button */
.btn--primary {
  background-color: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  box-shadow: var(--btn-shadow);
}

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

.btn--primary:active:not(:disabled) {
  transform: translateY(0);
  box-shadow: var(--btn-shadow);
}

/* Secondary Button */
.btn--secondary {
  background-color: var(--btn-secondary-bg);
  color: var(--btn-secondary-text);
  border: var(--btn-border-width) solid var(--btn-secondary-border);
}

.btn--secondary:hover:not(:disabled) {
  background-color: var(--btn-secondary-bg-hover);
  color: var(--btn-secondary-text-hover);
  border-color: var(--btn-secondary-bg-hover);
  transform: translateY(-2px);
}

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

/* Ghost Button */
.btn--ghost {
  background-color: var(--btn-ghost-bg);
  color: var(--btn-ghost-text);
  padding: var(--btn-padding-sm);
}

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

/* ========================================
   Button Sizes
   ======================================== */

.btn--sm {
  padding: var(--btn-padding-sm);
  font-size: var(--btn-font-size-sm);
}

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

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

.btn--xl {
  padding: var(--btn-padding-xl);
  font-size: var(--btn-font-size-lg);
  min-width: 200px;
}

/* Full width button */
.btn--full {
  width: 100%;
}

/* ========================================
   Button Icons
   ======================================== */

.btn__icon {
  display: inline-flex;
  width: 1em;
  height: 1em;
}

.btn__icon--start {
  margin-right: 0.5em;
}

.btn__icon--end {
  margin-left: 0.5em;
}

/* ========================================
   Button Groups
   ======================================== */

.btn-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
}

.btn-group--center {
  justify-content: center;
}

.btn-group--end {
  justify-content: flex-end;
}

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

/* ========================================
   WordPress Compatibility Layer
   ======================================== */

/* Map WordPress button to our system */
.wp-block-button__link {
  /* Inherit base button styles */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--btn-padding-md);
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--btn-border-radius);
  transition: var(--btn-transition);
  cursor: pointer;
}

/* WordPress button variants */
.wp-block-button.is-style-fill .wp-block-button__link,
.btn-primary .wp-block-button__link {
  background-color: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  box-shadow: var(--btn-shadow);
}

.wp-block-button.is-style-fill .wp-block-button__link:hover,
.btn-primary .wp-block-button__link:hover {
  background-color: var(--btn-primary-bg-hover);
  box-shadow: var(--btn-shadow-hover);
  transform: translateY(-2px);
}

.wp-block-button.is-style-outline .wp-block-button__link,
.btn-secondary .wp-block-button__link {
  background-color: transparent;
  color: var(--btn-secondary-text);
  border: var(--btn-border-width) solid var(--btn-secondary-border);
}

.wp-block-button.is-style-outline .wp-block-button__link:hover,
.btn-secondary .wp-block-button__link:hover {
  background-color: var(--btn-secondary-bg-hover);
  color: var(--btn-secondary-text-hover);
  border-color: var(--btn-secondary-bg-hover);
}

/* WordPress button group compatibility */
.wp-block-buttons {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.wp-block-buttons.is-content-justification-center {
  justify-content: center;
}

.wp-block-buttons.is-vertical {
  flex-direction: column;
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 768px) {
  .btn {
    font-size: var(--btn-font-size-sm);
    padding: var(--btn-padding-sm);
  }
  
  .btn--lg {
    font-size: var(--btn-font-size-md);
    padding: var(--btn-padding-md);
  }
  
  .btn-group {
    flex-direction: column;
    width: 100%;
  }
  
  .btn-group .btn {
    width: 100%;
  }
}

/* ========================================
   Migration Helpers
   ======================================== */

/* Temporary mappings for old classes during migration */
.cta-button,
.btn-pricing,
.btn-package,
.btn-select {
  /* Will inherit from .btn with JavaScript class addition */
}

/* Map old primary/secondary patterns */
.cta-btn-primary,
.btn-cta-primary {
  /* Will map to .btn--primary */
}

.cta-btn-secondary,
.btn-cta-secondary {
  /* Will map to .btn--secondary */
}