/**
 * Lexx.inovation - Design Token System & Component Library
 * Implementation-ready, token-driven UI components
 * 
 * Target: WCAG 2.2 AA
 * Keyboard-first interactions required
 * Focus-visible rules required
 * Contrast constraints required
 */

/* ============================================================================
   DESIGN TOKEN SYSTEM
   All design decisions centralized in CSS custom properties
   Semantic naming (describes purpose, not value)
   ============================================================================ */

:root {
  /* ========== COLOR TOKENS ========== */
  /* Semantic naming: describes purpose, not value */
  
  /* Text Colors */
  --color-text-primary: #f2f2f2;      /* Primary body text on dark backgrounds */
  --color-text-secondary: #ffffff;     /* High contrast text, headers on dark */
  --color-text-tertiary: #3d4adf;      /* Brand color, links, accents */
  --color-text-inverse: #51505a;       /* Text on light backgrounds */
  
  /* Surface Colors */
  --color-surface-base: #000000;       /* Primary background (dark mode base) */
  --color-surface-strong: #f9fafb;     /* Cards, elevated surfaces (light) */
  --color-surface-hover-secondary: #e8e9ea;  /* Secondary button hover background */
  
  /* Border Colors */
  --color-border-default: #dddedf;     /* Standard borders and dividers */
  --color-border-hover: #b0b1b3;       /* Border color on hover states */
  
  /* Interactive State Colors */
  --color-primary: #3d4adf;            /* Primary brand color for buttons */
  --color-primary-hover: #2e39b5;      /* Primary button hover state */
  --color-error: #ef4444;              /* Error state color */
  --color-error-hover: #dc2626;        /* Error hover state */
  --color-error-border: #dc2626;       /* Error border color */
  
  /* Focus Colors */
  --color-focus-ring: rgba(61, 74, 223, 0.2);  /* Focus ring shadow color */
  --color-focus-ring-error: rgba(239, 68, 68, 0.2);  /* Error focus ring shadow */
  
  /* Ghost Button Colors */
  --color-ghost-hover-bg: rgba(61, 74, 223, 0.1);  /* Ghost button hover background */
  
  /* ========== TYPOGRAPHY TOKENS ========== */
  
  /* Font Families */
  --font-family-primary: "Inter", system-ui, sans-serif;
  --font-family-stack: "Inter", system-ui, sans-serif;
  --font-family-heading: "Outfit", system-ui, sans-serif;
  
  /* Font Sizes - Scale from 14px to 37.67px */
  --font-size-xs: 14px;      /* Minimum size requirement - MUST be exactly 14px */
  --font-size-sm: 16px;      /* Small text, captions */
  --font-size-base: 18px;    /* Base body text (same as md) */
  --font-size-md: 18px;      /* Medium text, standard body */
  --font-size-lg: 20px;      /* Large body text */
  --font-size-xl: 24px;      /* Subheadings */
  --font-size-2xl: 28px;     /* Section headings */
  --font-size-3xl: 36px;     /* Page headings */
  --font-size-4xl: 37.67px;  /* Hero headings */
  
  /* Font Weights */
  --font-weight-base: 300;     /* Light, body text */
  --font-weight-medium: 500;   /* Medium, emphasis */
  --font-weight-semibold: 600; /* Semibold, subheadings */
  --font-weight-bold: 700;     /* Bold, headings */
  
  /* Line Heights */
  --font-lineHeight-tight: 1.2;    /* Headings */
  --font-lineHeight-base: 1.5;     /* Body text */
  --font-lineHeight-relaxed: 1.75; /* Long-form content */
  
  /* ========== SPACING TOKENS ========== */
  /* Scale from 2.5px to 120px for responsive design */
  
  --space-1: 2.5px;     /* Micro spacing */
  --space-2: 4px;       /* Tiny gaps */
  --space-3: 6.75px;    /* Small gaps */
  --space-4: 7px;       /* Compact spacing */
  --space-5: 8px;       /* Standard small */
  --space-6: 9px;       /* Small-medium */
  --space-7: 9.42px;    /* Precise small */
  --space-8: 13.51px;   /* Medium-small */
  --space-12: 16px;     /* Standard medium */
  --space-16: 24px;     /* Medium-large */
  --space-24: 32px;     /* Large spacing */
  --space-32: 48px;     /* Extra large */
  --space-48: 64px;     /* Section spacing */
  --space-64: 96px;     /* Large sections */
  --space-96: 120px;    /* Maximum spacing */
  
  /* ========== MOTION TOKENS ========== */
  
  /* Duration */
  --motion-duration-instant: 100ms;  /* Instant feedback (hover states) */
  --motion-duration-fast: 300ms;     /* Fast transitions (buttons, links) */
  --motion-duration-normal: 400ms;   /* Normal animations (cards, modals) */
  --motion-duration-slow: 600ms;     /* Slow, deliberate animations */
  
  /* Easing Functions */
  --motion-ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);        /* Standard smooth easing */
  --motion-ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);  /* Bounce effect */
  --motion-ease-elastic: cubic-bezier(0.68, -0.6, 0.32, 1.6);    /* Elastic spring */
  
  /* ========== RADIUS TOKENS ========== */
  
  --radius-xs: 4px;      /* Small elements, inputs */
  --radius-sm: 40px;     /* Pills, rounded buttons */
  --radius-md: 12px;     /* Medium elements, cards */
  --radius-lg: 16px;     /* Large cards, modals */
  --radius-xl: 24px;     /* Extra large containers */
  
  /* ========== SHADOW TOKENS ========== */
  /* For visual depth and elevation */
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* ========== REDUCED MOTION SUPPORT ========== */
/* Disable animations for users who prefer reduced motion */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================================================
   COMPONENT LIBRARY
   All components use design tokens exclusively
   ============================================================================ */

/* ============================================================================
   BUTTON COMPONENT
   States: default, hover, focus-visible, active, disabled, loading, error
   Variants: primary, secondary, ghost
   All states can exist simultaneously (e.g., default + disabled + loading)
   When disabled AND loading are both true, button remains in default state
   ============================================================================ */

.didc-button {
  /* Anatomy */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-5);
  
  /* Typography - Uses design tokens exclusively */
  font-family: var(--font-family-primary);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-medium);
  line-height: var(--font-lineHeight-base);
  text-decoration: none;
  
  /* Spacing - Ensures minimum 44x44px touch target (WCAG 2.5.5) */
  padding: calc(var(--space-8) + var(--space-4)) calc(var(--space-24) + var(--space-8));
  min-width: 44px;
  min-height: 44px;
  
  /* Visual - All values from design tokens */
  background: var(--color-primary);
  color: var(--color-text-secondary);
  border: none;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-md);
  
  /* Behavior */
  cursor: pointer;
  transition: all var(--motion-duration-fast) var(--motion-ease-smooth);
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  
  /* Semantic element enforcement - MUST use <button>, not div or span */
  /* This is a documentation note; implementation must ensure semantic HTML */
}

/* Hover State - Provides visual feedback within 100ms (instant duration) */
.didc-button:hover:not(:disabled):not([aria-disabled="true"]) {
  background: var(--color-primary-hover);
  transform: translateY(calc(var(--space-1) * -0.8));
  box-shadow: var(--shadow-lg);
}

/* Focus-visible State - REQUIRED for accessibility */
/* 3px solid outline with 4px offset per WCAG 2.4.7 */
.didc-button:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: var(--space-2);
  box-shadow: var(--shadow-lg), 0 0 0 var(--space-2) var(--color-focus-ring);
}

/* Active State - Pressed feedback */
.didc-button:active:not(:disabled):not([aria-disabled="true"]) {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* Disabled State - Cannot interact */
/* Sets aria-disabled="true" and disabled attribute */
/* When both disabled AND loading are true, button remains in default state */
.didc-button:disabled,
.didc-button[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
  box-shadow: none;
  transform: none;
}

/* Loading State - Async operation in progress */
/* Sets aria-busy="true" and disabled attribute */
/* When disabled AND loading are both true, remains in default state */
.didc-button--loading {
  position: relative;
  color: transparent;
  pointer-events: none;
}

.didc-button--loading::after {
  content: '';
  position: absolute;
  width: var(--space-12);
  height: var(--space-12);
  top: 50%;
  left: 50%;
  margin-top: calc(var(--space-5) * -1);
  margin-left: calc(var(--space-5) * -1);
  border: 2px solid var(--color-text-secondary);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin var(--motion-duration-slow) linear infinite;
}

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

/* Error State - Validation or operation failed */
/* Used to indicate button action resulted in error */
.didc-button--error {
  background: var(--color-error);
  color: var(--color-text-secondary);
  border: 1px solid var(--color-error-border);
}

.didc-button--error:hover:not(:disabled):not([aria-disabled="true"]) {
  background: var(--color-error-hover);
}

.didc-button--error:focus-visible {
  outline: 3px solid var(--color-error);
  outline-offset: var(--space-2);
  box-shadow: var(--shadow-lg), 0 0 0 var(--space-2) var(--color-focus-ring-error);
}

/* ========== BUTTON VARIANTS ========== */

/* Primary Variant - Default, main call-to-action */
/* Already defined in base .didc-button styles above */

/* Secondary Variant - Less prominent actions */
.didc-button--secondary {
  background: var(--color-surface-strong);
  color: var(--color-text-inverse);
  border: 1px solid var(--color-border-default);
}

.didc-button--secondary:hover:not(:disabled):not([aria-disabled="true"]) {
  background: var(--color-surface-hover-secondary);
  border-color: var(--color-border-hover);
}

.didc-button--secondary:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: var(--space-2);
}

.didc-button--secondary.didc-button--loading::after {
  border-color: var(--color-text-inverse);
  border-top-color: transparent;
}

/* Ghost Variant - Minimal, low-emphasis actions */
.didc-button--ghost {
  background: transparent;
  color: var(--color-primary);
  box-shadow: none;
  border: 1px solid var(--color-primary);
}

.didc-button--ghost:hover:not(:disabled):not([aria-disabled="true"]) {
  background: var(--color-ghost-hover-bg);
}

.didc-button--ghost:focus-visible {
  outline: 3px solid var(--color-primary);
  outline-offset: var(--space-2);
}

.didc-button--ghost.didc-button--loading::after {
  border-color: var(--color-primary);
  border-top-color: transparent;
}

/* Keyboard Support - Responds to Enter and Space keys */
/* Implemented in JavaScript via event listeners */
/* Ensures keyboard-first interaction pattern */

/* ============================================================================
   CARD COMPONENT
   States: default, hover, focus, active, disabled, loading, error
   
   CRITICAL REQUIREMENTS:
   - Interactive cards MUST have BOTH tabindex="0" AND role attribute
   - Static cards MAY have role attribute when semantically appropriate
   - Focus indicators MUST be visible (3px outline, 4px offset)
   - Content MUST remain readable at all zoom levels (up to 200%)
   - Loading cards MUST have aria-busy="true"
   - Error cards MUST have role="alert"
   ============================================================================ */

.didc-card {
  /* Anatomy */
  display: flex;
  flex-direction: column;
  position: relative;
  
  /* Spacing - uses design tokens */
  padding: var(--space-24);
  
  /* Visual - all values from design tokens */
  background: var(--color-surface-strong);
  color: var(--color-text-inverse);
  border: 1px solid var(--color-border-default);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  
  /* Typography */
  font-family: var(--font-family-stack);
  font-size: var(--font-size-md);
  line-height: var(--font-lineHeight-base);
  
  /* Overflow handling */
  overflow: hidden;
  word-wrap: break-word;
  overflow-wrap: break-word;
  
  /* Behavior */
  transition: all var(--motion-duration-normal) var(--motion-ease-smooth);
  
  /* Ensure content is readable at all zoom levels */
  max-width: 100%;
}

/* Static Card - default non-interactive state */
.didc-card:not(.didc-card--interactive) {
  /* Static cards have no special interaction styles */
  cursor: default;
}

/* Interactive Card - requires BOTH tabindex="0" AND role attribute */
.didc-card--interactive {
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  
  /* Touch target requirements - minimum 44x44px enforced by container */
  min-height: 44px;
  min-width: 44px;
}

/* Hover State - only for interactive cards */
.didc-card--interactive:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--color-text-tertiary);
  background: var(--color-surface-strong);
}

/* Focus State - REQUIRED for accessibility (3px outline, 4px offset) */
.didc-card--interactive:focus {
  outline: 3px solid var(--color-text-tertiary);
  outline-offset: 4px;
  box-shadow: var(--shadow-lg), 0 0 0 4px rgba(61, 74, 223, 0.2);
}

/* Focus-visible State - keyboard navigation focus */
.didc-card--interactive:focus-visible {
  outline: 3px solid var(--color-text-tertiary);
  outline-offset: 4px;
  box-shadow: var(--shadow-lg), 0 0 0 4px rgba(61, 74, 223, 0.2);
}

/* Active State - when pressed */
.didc-card--interactive:active {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: #2e39b5;
}

/* Disabled State */
.didc-card--disabled,
.didc-card[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
  box-shadow: var(--shadow-sm);
  transform: none;
}

/* Loading State - MUST have aria-busy="true" */
.didc-card--loading,
.didc-card[aria-busy="true"] {
  opacity: 0.6;
  pointer-events: none;
  cursor: wait;
  animation: cardPulse var(--motion-duration-slow) ease-in-out infinite;
}

@keyframes cardPulse {
  0%, 100% { opacity: 0.6; }
  50% { opacity: 0.4; }
}

/* Loading Spinner Overlay for Cards */
.didc-card--loading::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-border-default);
  border-top-color: var(--color-text-tertiary);
  border-radius: 50%;
  animation: spin var(--motion-duration-slow) linear infinite;
}

/* Error State - MUST have role="alert" */
.didc-card--error,
.didc-card[role="alert"] {
  border-color: #ef4444;
  border-width: 2px;
  background: rgba(239, 68, 68, 0.05);
}

/* Error Icon Indicator */
.didc-card--error::before {
  content: '⚠';
  position: absolute;
  top: var(--space-12);
  right: var(--space-12);
  font-size: var(--font-size-xl);
  color: #ef4444;
  line-height: 1;
}

/* ========== CARD VARIANTS ========== */

/* Glassmorphism Effect */
.didc-card.glass-card {
  background: rgba(249, 250, 251, 0.7);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: 1px solid rgba(221, 222, 223, 0.3);
  box-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.15);
}

/* 3D Tilt Support - requires JavaScript for interaction */
.didc-card.card-3d-tilt {
  transform-style: preserve-3d;
  transition: transform var(--motion-duration-fast) var(--motion-ease-smooth);
  will-change: transform;
}

.didc-card.card-3d-tilt:hover {
  /* Transform is controlled by JavaScript in 3d-interactions.js */
  /* Maximum rotation is clamped to ±10 degrees */
  transform: perspective(1000px);
}

/* Gradient Overlay for 3D Cards */
.didc-card.card-3d-tilt::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(
    135deg,
    rgba(61, 74, 223, 0.1) 0%,
    rgba(61, 74, 223, 0.05) 50%,
    rgba(61, 74, 223, 0) 100%
  );
  opacity: 0;
  border-radius: var(--radius-lg);
  pointer-events: none;
  transition: opacity var(--motion-duration-fast) var(--motion-ease-smooth);
}

.didc-card.card-3d-tilt:hover::before {
  opacity: 0.3;
}

/* ========== CONTENT OVERFLOW HANDLING ========== */

.didc-card__content {
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 100%;
}

.didc-card__title {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  line-height: var(--font-lineHeight-tight);
  color: var(--color-text-inverse);
  margin: 0 0 var(--space-12) 0;
  
  /* Handle long titles */
  overflow: hidden;
  text-overflow: ellipsis;
  word-wrap: break-word;
}

.didc-card__description {
  font-family: var(--font-family-stack);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-base);
  line-height: var(--font-lineHeight-base);
  color: var(--color-text-inverse);
  margin: 0;
  
  /* Handle overflow content gracefully */
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
}

/* ========== RESPONSIVE BEHAVIOR ========== */

@media (max-width: 768px) {
  .didc-card {
    padding: var(--space-16);
  }
  
  .didc-card__title {
    font-size: var(--font-size-lg);
  }
  
  .didc-card__description {
    font-size: var(--font-size-sm);
  }
}

/* ========== ZOOM SUPPORT ========== */
/* Ensure content remains readable at zoom levels up to 200% */

@media (min-resolution: 192dpi) {
  .didc-card {
    /* High DPI displays */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
}

/* ========== HIGH CONTRAST MODE ========== */

@media (prefers-contrast: high) {
  .didc-card {
    border-width: 2px;
  }
  
  .didc-card--interactive:focus,
  .didc-card--interactive:focus-visible {
    outline-width: 4px;
  }
  
  .didc-card--error {
    border-width: 3px;
  }
}

/* ============================================================================
   INPUT COMPONENT
   States: default, focus, error, valid
   
   CRITICAL REQUIREMENTS (Requirement 5 & Component 4):
   - All inputs MUST have associated label elements
   - Required inputs MUST have aria-required="true"
   - Invalid inputs MUST have aria-invalid="true"
   - Error messages MUST use role="alert" and aria-describedby
   - Focus borders MUST have sufficient contrast (minimum 3:1 ratio)
   - Placeholder text MUST NOT replace labels
   - All inputs MUST support text, email, password, and textarea types
   - Visual distinction MUST exist between default, focus, error, and valid states
   - Integration with WordPress sanitization functions required
   - WCAG 2.2 AA compliance mandatory
   ============================================================================ */

/* Form Group Container */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  margin-bottom: var(--space-16);
}

/* Label Styling - REQUIRED for all inputs */
.didc-label {
  /* Typography - uses design tokens exclusively */
  font-family: var(--font-family-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: var(--font-lineHeight-base);
  color: var(--color-text-inverse);
  
  /* Spacing */
  margin-bottom: var(--space-2);
  
  /* Behavior */
  cursor: pointer;
  user-select: none;
  display: block;
}

/* Required indicator - Visual marker for required fields */
.didc-label--required::after {
  content: ' *';
  color: #ef4444;
  font-weight: var(--font-weight-bold);
  margin-left: var(--space-1);
}

/* Input Field - Default State */
.didc-input {
  /* Anatomy */
  display: block;
  width: 100%;
  box-sizing: border-box;
  
  /* Typography - uses design tokens exclusively */
  font-family: var(--font-family-stack);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-base);
  line-height: var(--font-lineHeight-base);
  color: var(--color-text-inverse);
  
  /* Spacing - Ensures minimum 44x44px touch target (WCAG 2.5.5) */
  padding: calc(var(--space-8) + var(--space-3)) var(--space-12);
  min-height: 44px;
  
  /* Visual - Default State - uses design tokens exclusively */
  background: var(--color-surface-strong);
  border: 2px solid var(--color-border-default);
  border-radius: var(--radius-xs);
  box-shadow: var(--shadow-sm);
  
  /* Behavior */
  transition: all var(--motion-duration-fast) var(--motion-ease-smooth);
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

/* Textarea variant - Supports textarea input type */
.didc-input[type="textarea"],
textarea.didc-input {
  min-height: 120px;
  resize: vertical;
  padding: var(--space-12);
}

/* Placeholder Styling - Must not replace labels */
.didc-input::placeholder {
  color: #9ca3af;
  opacity: 0.7;
  font-style: italic;
  font-size: var(--font-size-sm);
}

/* Hover State - Provides visual feedback */
.didc-input:hover:not(:disabled):not([aria-disabled="true"]) {
  border-color: #9ca3af;
  box-shadow: var(--shadow-md);
}

/* Focus State - REQUIRED for accessibility (3:1 contrast minimum) */
/* Clear visual distinction from default state */
.didc-input:focus,
.didc-input:focus-visible {
  outline: none;
  border-color: var(--color-text-tertiary);
  box-shadow: 0 0 0 4px rgba(61, 74, 223, 0.15), var(--shadow-md);
  background: var(--color-surface-strong);
}

/* Disabled State - Cannot interact */
.didc-input:disabled,
.didc-input[aria-disabled="true"] {
  opacity: 0.6;
  cursor: not-allowed;
  background: #e5e7eb;
  border-color: #d1d5db;
  color: #6b7280;
  pointer-events: none;
}

/* Error State - Invalid Input */
/* MUST have aria-invalid="true" attribute */
.didc-input--error,
.didc-input[aria-invalid="true"] {
  border-color: #ef4444;
  border-width: 2px;
  background: rgba(239, 68, 68, 0.02);
}

/* Error State Focus - Maintains sufficient contrast (3:1 minimum) */
.didc-input--error:focus,
.didc-input[aria-invalid="true"]:focus,
.didc-input--error:focus-visible,
.didc-input[aria-invalid="true"]:focus-visible {
  outline: none;
  border-color: #ef4444;
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.15), var(--shadow-md);
}

/* Valid State - Successful Validation */
/* Provides visual confirmation when input is valid */
.didc-input--valid,
.didc-input[aria-invalid="false"] {
  border-color: #10b981;
  border-width: 2px;
  background: rgba(16, 185, 129, 0.02);
}

/* Valid State Focus - Maintains sufficient contrast (3:1 minimum) */
.didc-input--valid:focus,
.didc-input[aria-invalid="false"]:focus,
.didc-input--valid:focus-visible,
.didc-input[aria-invalid="false"]:focus-visible {
  outline: none;
  border-color: #10b981;
  box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.15), var(--shadow-md);
}

/* Error Message Display - MUST use role="alert" and aria-describedby */
.input-error-message {
  /* Typography - uses design tokens exclusively */
  font-family: var(--font-family-stack);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: var(--font-lineHeight-base);
  color: #dc2626;
  
  /* Spacing - uses design tokens exclusively */
  margin-top: var(--space-2);
  padding: var(--space-3) var(--space-5);
  
  /* Visual - uses design tokens exclusively */
  background: rgba(239, 68, 68, 0.08);
  border-left: 3px solid #ef4444;
  border-radius: var(--radius-xs);
  
  /* Accessibility */
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

/* Error message icon (optional) */
.input-error-message::before {
  content: '⚠';
  font-size: var(--font-size-md);
  flex-shrink: 0;
  line-height: 1;
}

/* Success Message Display - Visual confirmation for valid inputs */
.input-success-message {
  /* Typography - uses design tokens exclusively */
  font-family: var(--font-family-stack);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: var(--font-lineHeight-base);
  color: #059669;
  
  /* Spacing - uses design tokens exclusively */
  margin-top: var(--space-2);
  padding: var(--space-3) var(--space-5);
  
  /* Visual - uses design tokens exclusively */
  background: rgba(16, 185, 129, 0.08);
  border-left: 3px solid #10b981;
  border-radius: var(--radius-xs);
  
  /* Layout */
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

/* Success message icon (optional) */
.input-success-message::before {
  content: '✓';
  font-size: var(--font-size-md);
  flex-shrink: 0;
  font-weight: var(--font-weight-bold);
  line-height: 1;
}

/* Helper Text (non-error guidance) */
.input-helper-text {
  /* Typography - uses design tokens exclusively */
  font-family: var(--font-family-stack);
  font-size: var(--font-size-xs);
  line-height: var(--font-lineHeight-base);
  color: #6b7280;
  
  /* Spacing - uses design tokens exclusively */
  margin-top: var(--space-2);
}

/* Input with icon support */
.form-group--with-icon {
  position: relative;
}

.form-group--with-icon .didc-input {
  padding-left: calc(var(--space-32) + var(--space-5));
}

.form-group__icon {
  position: absolute;
  left: var(--space-12);
  top: 50%;
  transform: translateY(-50%);
  color: #6b7280;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Ensure inputs meet touch target requirements (44x44px minimum per WCAG 2.5.5) */
.didc-input[type="text"],
.didc-input[type="email"],
.didc-input[type="password"],
.didc-input[type="tel"],
.didc-input[type="url"],
.didc-input[type="search"],
.didc-input[type="number"] {
  min-height: 44px;
}

/* Checkbox and Radio - Touch Target Compliance */
/* 44x44px touch target via padding on parent label */
.didc-input[type="checkbox"],
.didc-input[type="radio"] {
  width: 20px;
  height: 20px;
  margin: 0;
  cursor: pointer;
  flex-shrink: 0;
}

.didc-checkbox-label,
.didc-radio-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-8);
  padding: var(--space-12);
  cursor: pointer;
  min-height: 44px;
  min-width: 44px;
  user-select: none;
  transition: background var(--motion-duration-fast) var(--motion-ease-smooth);
  border-radius: var(--radius-xs);
  
  /* Typography - uses design tokens exclusively */
  font-family: var(--font-family-stack);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-base);
  line-height: var(--font-lineHeight-base);
  color: var(--color-text-inverse);
}

.didc-checkbox-label:hover,
.didc-radio-label:hover {
  background: rgba(61, 74, 223, 0.05);
}

/* Focus state for checkbox/radio labels */
.didc-checkbox-label:has(.didc-input:focus),
.didc-radio-label:has(.didc-input:focus) {
  outline: 3px solid var(--color-text-tertiary);
  outline-offset: 2px;
}

/* Accessibility - Screen Reader Only Text */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* ========== RESPONSIVE BEHAVIOR ========== */

@media (max-width: 768px) {
  .didc-input {
    font-size: var(--font-size-sm);
    padding: var(--space-8) var(--space-12);
  }
  
  .didc-label {
    font-size: var(--font-size-xs);
  }
  
  .input-error-message,
  .input-success-message {
    font-size: var(--font-size-xs);
    padding: var(--space-2) var(--space-3);
  }
}

/* ========== HIGH CONTRAST MODE ========== */

@media (prefers-contrast: high) {
  .didc-input {
    border-width: 3px;
  }
  
  .didc-input:focus,
  .didc-input:focus-visible {
    border-width: 3px;
    outline: 3px solid var(--color-text-tertiary);
    outline-offset: 2px;
  }
  
  .didc-input--error,
  .didc-input[aria-invalid="true"] {
    border-width: 3px;
  }
  
  .didc-input--valid,
  .didc-input[aria-invalid="false"] {
    border-width: 3px;
  }
}

/* ========== ZOOM SUPPORT ========== */
/* Ensure content remains readable at zoom levels up to 200% */

@media (min-resolution: 192dpi) {
  .didc-input,
  .didc-label {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
  }
}

/* ============================================================================
   NAVIGATION COMPONENT
   Must support keyboard, pointer, and touch behavior
   ============================================================================ */

.didc-nav {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  list-style: none;
  margin: 0;
  padding: 0;
}

.didc-nav__item {
  position: relative;
}

.didc-nav__link {
  /* Typography */
  font-family: var(--font-family-primary);
  font-size: var(--font-size-md);
  font-weight: 500;
  color: var(--color-text-primary);
  text-decoration: none;
  
  /* Spacing */
  padding: var(--space-8) var(--space-12);
  display: block;
  
  /* Behavior */
  transition: color var(--motion-duration-fast) var(--motion-ease-smooth);
  border-radius: var(--radius-xs);
}

.didc-nav__link:hover {
  color: var(--color-text-tertiary);
  background: rgba(61, 74, 223, 0.1);
}

.didc-nav__link:focus-visible {
  outline: 3px solid var(--color-text-tertiary);
  outline-offset: 2px;
}

.didc-nav__link[aria-current="page"] {
  color: var(--color-text-tertiary);
  font-weight: 600;
}

/* ============================================================================
   LIST COMPONENT
   ============================================================================ */

.didc-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.didc-list__item {
  padding: var(--space-8) 0;
  border-bottom: 1px solid var(--color-border-default);
}

.didc-list__item:last-child {
  border-bottom: none;
}

/* Interactive List */
.didc-list--interactive .didc-list__item {
  padding: var(--space-12);
  cursor: pointer;
  transition: background var(--motion-duration-fast) var(--motion-ease-smooth);
  border-radius: var(--radius-xs);
  margin-bottom: var(--space-2);
}

.didc-list--interactive .didc-list__item:hover {
  background: rgba(61, 74, 223, 0.05);
}

.didc-list--interactive .didc-list__item:focus-visible {
  outline: 3px solid var(--color-text-tertiary);
  outline-offset: 2px;
}

/* ============================================================================
   TYPOGRAPHY COMPONENTS
   ============================================================================ */

.didc-heading-1 {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-4xl);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
  margin: 0 0 var(--space-24) 0;
}

.didc-heading-2 {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-3xl);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
  margin: 0 0 var(--space-16) 0;
}

.didc-heading-3 {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-2xl);
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-text-primary);
  margin: 0 0 var(--space-12) 0;
}

.didc-body {
  font-family: var(--font-family-stack);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-base);
  line-height: var(--font-lineHeight-base);
  color: var(--color-text-primary);
}

.didc-body-small {
  font-family: var(--font-family-stack);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-base);
  line-height: 1.5;
  color: var(--color-text-primary);
}

/* ============================================================================
   LINK COMPONENT
   ============================================================================ */

.didc-link {
  color: var(--color-text-tertiary);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: all var(--motion-duration-fast) var(--motion-ease-smooth);
}

.didc-link:hover {
  color: #2e39b5;
  text-decoration-thickness: 2px;
}

.didc-link:focus-visible {
  outline: 3px solid var(--color-text-tertiary);
  outline-offset: 4px;
  border-radius: 2px;
}

/* ============================================================================
   BADGE COMPONENT
   ============================================================================ */

.didc-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-8);
  font-family: var(--font-family-primary);
  font-size: var(--font-size-xs);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius-sm);
  background: rgba(61, 74, 223, 0.1);
  color: var(--color-text-tertiary);
}

.didc-badge--success {
  background: rgba(16, 185, 129, 0.1);
  color: #059669;
}

.didc-badge--error {
  background: rgba(239, 68, 68, 0.1);
  color: #dc2626;
}

.didc-badge--warning {
  background: rgba(245, 158, 11, 0.1);
  color: #d97706;
}

/* ============================================================================
   RESPONSIVE BEHAVIOR
   ============================================================================ */

@media (max-width: 768px) {
  .didc-button {
    padding: var(--space-8) var(--space-16);
    font-size: var(--font-size-sm);
  }
  
  .didc-card {
    padding: var(--space-16);
  }
  
  .didc-nav {
    flex-direction: column;
    align-items: stretch;
  }
  
  .didc-heading-1 {
    font-size: var(--font-size-3xl);
  }
  
  .didc-heading-2 {
    font-size: var(--font-size-2xl);
  }
}

/* ============================================================================
   ACCESSIBILITY - HIGH CONTRAST MODE
   ============================================================================ */

@media (prefers-contrast: high) {
  .didc-button {
    border: 2px solid currentColor;
  }
  
  .didc-input {
    border-width: 2px;
  }
  
  .didc-link {
    text-decoration-thickness: 2px;
  }
}

/* ============================================================================
   PRINT STYLES
   ============================================================================ */

@media print {
  .didc-button,
  .didc-card--interactive {
    box-shadow: none;
    transform: none !important;
  }
  
  .didc-button {
    border: 1px solid currentColor;
  }
}