/**
 * Touch Optimization Styles
 * 
 * Provides CSS patterns for touch-friendly interfaces with proper
 * touch target sizes, spacing, and mobile-optimized interactions.
 * 
 * Requirements: 1.3, 8.2
 */

/* ============================================
   Touch Target Base Classes
   ============================================ */

/**
 * Base touch target class - ensures minimum 44px touch area
 */
.touch-target {
  min-height: 44px;
  min-width: 44px;
  position: relative;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

/**
 * Recommended touch target size (48px)
 */
.touch-target-recommended {
  min-height: 48px;
  min-width: 48px;
}

/**
 * Large touch target for primary actions (56px)
 */
.touch-target-lg {
  min-height: 56px;
  min-width: 56px;
}

/* ============================================
   Touch-Friendly Button Patterns
   ============================================ */

/**
 * Small touch-friendly button (44px minimum)
 */
.touch-button-sm {
  min-height: 44px;
  min-width: 44px;
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  line-height: 1.25rem;
  border-radius: 0.375rem;
  transition: all 0.2s ease-in-out;
}

/**
 * Medium touch-friendly button (48px recommended)
 */
.touch-button-md {
  min-height: 48px;
  min-width: 48px;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  line-height: 1.5rem;
  border-radius: 0.5rem;
  transition: all 0.2s ease-in-out;
}

/**
 * Large touch-friendly button (56px)
 */
.touch-button-lg {
  min-height: 56px;
  min-width: 56px;
  padding: 1rem 2rem;
  font-size: 1.125rem;
  line-height: 1.75rem;
  border-radius: 0.5rem;
  transition: all 0.2s ease-in-out;
}

/**
 * Touch-friendly button hover states
 */
.touch-button-sm:hover,
.touch-button-md:hover,
.touch-button-lg:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

/**
 * Touch-friendly button active states
 */
.touch-button-sm:active,
.touch-button-md:active,
.touch-button-lg:active {
  transform: translateY(0);
  box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}

/**
 * Touch-friendly button focus states (accessibility)
 */
.touch-button-sm:focus-visible,
.touch-button-md:focus-visible,
.touch-button-lg:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ============================================
   Touch-Friendly Form Input Patterns
   ============================================ */

/**
 * Small touch-friendly input (44px minimum)
 */
.touch-input-sm {
  min-height: 44px;
  width: 100%;
  padding: 0.5rem 0.75rem;
  font-size: 0.875rem;
  line-height: 1.25rem;
  border-radius: 0.375rem;
  border: 1px solid var(--color-border);
  background-color: var(--color-background);
  color: var(--color-foreground);
  transition: all 0.2s ease-in-out;
}

/**
 * Medium touch-friendly input (48px recommended)
 */
.touch-input-md {
  min-height: 48px;
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  line-height: 1.5rem;
  border-radius: 0.5rem;
  border: 1px solid var(--color-border);
  background-color: var(--color-background);
  color: var(--color-foreground);
  transition: all 0.2s ease-in-out;
}

/**
 * Large touch-friendly input (56px)
 */
.touch-input-lg {
  min-height: 56px;
  width: 100%;
  padding: 1rem 1.25rem;
  font-size: 1.125rem;
  line-height: 1.75rem;
  border-radius: 0.5rem;
  border: 1px solid var(--color-border);
  background-color: var(--color-background);
  color: var(--color-foreground);
  transition: all 0.2s ease-in-out;
}

/**
 * Touch-friendly input focus states
 */
.touch-input-sm:focus,
.touch-input-md:focus,
.touch-input-lg:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.1);
}

/**
 * Touch-friendly input hover states
 */
.touch-input-sm:hover,
.touch-input-md:hover,
.touch-input-lg:hover {
  border-color: var(--color-primary);
}

/**
 * Touch-friendly input disabled states
 */
.touch-input-sm:disabled,
.touch-input-md:disabled,
.touch-input-lg:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ============================================
   Touch-Friendly Spacing Patterns
   ============================================ */

/**
 * Minimum spacing between touch targets (8px)
 */
.touch-spacing {
  gap: 0.5rem;
}

/**
 * Recommended spacing between touch targets (12px)
 */
.touch-spacing-md {
  gap: 0.75rem;
}

/**
 * Comfortable spacing between touch targets (16px)
 */
.touch-spacing-lg {
  gap: 1rem;
}

/**
 * Vertical touch spacing
 */
.touch-spacing-y {
  row-gap: 0.5rem;
}

.touch-spacing-y-md {
  row-gap: 0.75rem;
}

.touch-spacing-y-lg {
  row-gap: 1rem;
}

/**
 * Horizontal touch spacing
 */
.touch-spacing-x {
  column-gap: 0.5rem;
}

.touch-spacing-x-md {
  column-gap: 0.75rem;
}

.touch-spacing-x-lg {
  column-gap: 1rem;
}

/* ============================================
   Touch-Friendly Interactive Elements
   ============================================ */

/**
 * Touch-friendly link
 */
.touch-link {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 0.75rem;
  color: var(--color-primary);
  text-decoration: none;
  transition: all 0.2s ease-in-out;
  border-radius: 0.375rem;
}

.touch-link:hover {
  background-color: rgba(124, 58, 237, 0.1);
  text-decoration: underline;
}

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

/**
 * Touch-friendly icon button
 */
.touch-icon-button {
  min-height: 44px;
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  border-radius: 0.5rem;
  transition: all 0.2s ease-in-out;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.touch-icon-button:hover {
  background-color: var(--color-muted);
  transform: scale(1.05);
}

.touch-icon-button:active {
  transform: scale(0.95);
}

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

/**
 * Touch-friendly checkbox/radio
 */
.touch-checkbox,
.touch-radio {
  min-height: 24px;
  min-width: 24px;
  cursor: pointer;
}

.touch-checkbox-label,
.touch-radio-label {
  min-height: 44px;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.5rem;
  cursor: pointer;
  user-select: none;
  border-radius: 0.375rem;
  transition: background-color 0.2s ease-in-out;
}

.touch-checkbox-label:hover,
.touch-radio-label:hover {
  background-color: var(--color-muted);
}

/* ============================================
   Touch-Friendly Card Patterns
   ============================================ */

/**
 * Touch-friendly card (clickable)
 */
.touch-card {
  min-height: 80px;
  padding: 1rem;
  border-radius: 0.5rem;
  background-color: var(--color-card);
  border: 1px solid var(--color-border);
  cursor: pointer;
  transition: all 0.2s ease-in-out;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
}

.touch-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.touch-card:active {
  transform: translateY(0);
}

/* ============================================
   Mobile-Specific Touch Optimizations
   ============================================ */

/**
 * Mobile touch optimizations (applies on small screens)
 */
@media (max-width: 767px) {
  /* Increase touch targets on mobile */
  .touch-target-mobile {
    min-height: 48px;
    min-width: 48px;
  }
  
  /* Increase spacing on mobile */
  .touch-spacing-mobile {
    gap: 0.75rem;
  }
  
  /* Larger buttons on mobile */
  .touch-button-sm {
    min-height: 48px;
    padding: 0.75rem 1.25rem;
  }
  
  /* Larger inputs on mobile */
  .touch-input-sm {
    min-height: 48px;
    padding: 0.75rem 1rem;
    font-size: 1rem; /* Prevent zoom on iOS */
  }
  
  /* Prevent iOS zoom on input focus */
  .touch-input-sm,
  .touch-input-md,
  .touch-input-lg {
    font-size: 16px;
  }
}

/* ============================================
   Touch Feedback Animations
   ============================================ */

/**
 * Ripple effect for touch feedback
 */
.touch-ripple {
  position: relative;
  overflow: hidden;
}

.touch-ripple::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background-color: rgba(255, 255, 255, 0.3);
  transform: translate(-50%, -50%);
  transition: width 0.6s, height 0.6s;
}

.touch-ripple:active::after {
  width: 200%;
  height: 200%;
}

/* ============================================
   Accessibility Enhancements
   ============================================ */

/**
 * Focus visible for keyboard navigation
 */
.touch-target:focus-visible,
.touch-button-sm:focus-visible,
.touch-button-md:focus-visible,
.touch-button-lg:focus-visible,
.touch-input-sm:focus-visible,
.touch-input-md:focus-visible,
.touch-input-lg:focus-visible,
.touch-link:focus-visible,
.touch-icon-button:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/**
 * Remove tap highlight on touch devices
 */
.touch-target,
.touch-button-sm,
.touch-button-md,
.touch-button-lg,
.touch-link,
.touch-icon-button,
.touch-card {
  -webkit-tap-highlight-color: transparent;
  -webkit-touch-callout: none;
}

/**
 * Smooth scrolling for touch devices
 */
@media (hover: none) and (pointer: coarse) {
  * {
    -webkit-overflow-scrolling: touch;
  }
}