/*
  AI in Legal Practice Dashboard
  ADA Compliant Styles - WCAG 2.1 AA

  Color Contrast Ratios (all meet 4.5:1 minimum):
  - Primary text (#1a1a2e) on white: 16.1:1
  - Secondary text (#4a5568) on white: 7.2:1
  - Link blue (#1e40af) on white: 8.6:1
  - White text on primary (#1e3a5f): 11.2:1
*/

/* CSS Reset and Base */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  /* Primary Colors - ADA Compliant */
  --color-primary: #1e3a5f;
  --color-primary-dark: #0f2744;
  --color-primary-light: #2d5a8a;

  /* Accent Colors */
  --color-accent: #2563eb;
  --color-accent-dark: #1e40af;

  /* Status Colors */
  --color-success: #166534;
  --color-success-bg: #dcfce7;
  --color-warning: #92400e;
  --color-warning-bg: #fef3c7;
  --color-locked: #6b7280;
  --color-locked-bg: #f3f4f6;

  /* Text Colors */
  --color-text-primary: #1a1a2e;
  --color-text-secondary: #4a5568;
  --color-text-light: #ffffff;

  /* Background Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f8fafc;
  --color-bg-tertiary: #e2e8f0;

  /* Border Colors */
  --color-border: #d1d5db;
  --color-border-focus: #2563eb;

  /* Typography Scale - Minimum 16px base for accessibility */
  --font-size-xs: 0.875rem;    /* 14px */
  --font-size-sm: 1rem;        /* 16px */
  --font-size-base: 1.125rem;  /* 18px */
  --font-size-lg: 1.25rem;     /* 20px */
  --font-size-xl: 1.5rem;      /* 24px */
  --font-size-2xl: 1.875rem;   /* 30px */
  --font-size-3xl: 2.25rem;    /* 36px */

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
}

/* Base Typography */
html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg-secondary);
  min-height: 100vh;
}

/* Focus States - Critical for Accessibility */
:focus {
  outline: 3px solid var(--color-border-focus);
  outline-offset: 2px;
}

:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 3px solid var(--color-border-focus);
  outline-offset: 2px;
}

/* Skip Link for Screen Readers */
.skip-link {
  position: absolute;
  top: -100px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: var(--color-text-light);
  padding: var(--space-md) var(--space-lg);
  text-decoration: none;
  font-weight: 600;
  border-radius: var(--radius-md);
  z-index: 1000;
  transition: top var(--transition-fast);
}

.skip-link:focus {
  top: var(--space-md);
}

/* Header */
.header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-text-light);
  padding: var(--space-lg) var(--space-xl);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.header-content {
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.header h1 {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin: 0;
}

.header-subtitle {
  font-size: var(--font-size-sm);
  opacity: 0.9;
  margin-top: var(--space-xs);
}

.header-nav {
  display: flex;
  gap: var(--space-md);
  align-items: center;
}

.header-nav a {
  color: var(--color-text-light);
  text-decoration: none;
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  font-weight: 500;
  transition: background-color var(--transition-fast);
}

.header-nav a:hover,
.header-nav a:focus {
  background-color: rgba(255, 255, 255, 0.15);
}

/* Main Layout */
.main-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--space-xl);
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: var(--space-xl);
  min-height: calc(100vh - 120px);
}

@media (max-width: 1024px) {
  .main-container {
    grid-template-columns: 1fr;
    padding: var(--space-lg);
  }
}

/* Sidebar */
.sidebar {
  position: sticky;
  top: 100px;
  height: fit-content;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
}

.sidebar-section {
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.sidebar-section h2 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-md);
  color: var(--color-primary);
}

/* Progress Tracker */
.progress-tracker {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.progress-item {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  border-radius: var(--radius-md);
  background: var(--color-bg-secondary);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.progress-item:hover {
  background: var(--color-bg-tertiary);
}

.progress-item.active {
  border-color: var(--color-accent);
  background: rgba(37, 99, 235, 0.05);
}

.progress-item.locked {
  opacity: 0.7;
  cursor: not-allowed;
}

.progress-item.locked:hover {
  background: var(--color-bg-secondary);
}

.progress-icon {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-sm);
  flex-shrink: 0;
}

.progress-icon.unlocked {
  background: var(--color-success-bg);
  color: var(--color-success);
}

.progress-icon.locked {
  background: var(--color-locked-bg);
  color: var(--color-locked);
}

.progress-icon.current {
  background: var(--color-accent);
  color: var(--color-text-light);
}

.progress-label {
  font-weight: 500;
  font-size: var(--font-size-sm);
}

.progress-status {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
}

/* Unlock Controls */
.unlock-controls {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.unlock-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  width: 100%;
}

.unlock-btn.primary {
  background: var(--color-accent);
  color: var(--color-text-light);
}

.unlock-btn.primary:hover {
  background: var(--color-accent-dark);
}

.unlock-btn.primary:disabled {
  background: var(--color-locked-bg);
  color: var(--color-locked);
  cursor: not-allowed;
}

.unlock-btn.secondary {
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.unlock-btn.secondary:hover {
  background: var(--color-bg-secondary);
}

/* Main Content Area */
.content-area {
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  overflow: hidden;
}

.content-header {
  background: var(--color-bg-secondary);
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--color-border);
}

.content-header h2 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.content-header p {
  color: var(--color-text-secondary);
  font-size: var(--font-size-base);
}

.content-body {
  padding: var(--space-xl);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-lg);
  flex-wrap: wrap;
}

.breadcrumb a {
  color: var(--color-accent);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb-separator {
  color: var(--color-border);
}

/* Document Cards */
.document-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-lg);
}

.document-card {
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition-fast);
  display: flex;
  flex-direction: column;
}

.document-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

.document-card.locked {
  opacity: 0.6;
  pointer-events: none;
}

.document-card.locked:hover {
  box-shadow: none;
  transform: none;
  border-color: var(--color-border);
}

.document-icon {
  width: 48px;
  height: 48px;
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  font-size: var(--font-size-xl);
}

.document-card h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  color: var(--color-primary);
}

.document-card p {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  flex-grow: 1;
  margin-bottom: var(--space-md);
}

.document-card a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  color: var(--color-accent);
  text-decoration: none;
  font-weight: 500;
  font-size: var(--font-size-sm);
}

.document-card a:hover {
  text-decoration: underline;
}

/* AI Integration Callout */
.ai-callout {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.08) 0%, rgba(37, 99, 235, 0.03) 100%);
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-top: var(--space-lg);
}

.ai-callout h4 {
  font-size: var(--font-size-base);
  font-weight: 600;
  color: var(--color-accent-dark);
  margin-bottom: var(--space-sm);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.ai-callout ul {
  margin: var(--space-md) 0 0 var(--space-lg);
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
}

.ai-callout li {
  margin-bottom: var(--space-sm);
}

/* Document Content Page */
.document-content {
  max-width: 900px;
  margin: 0 auto;
}

.document-content h1 {
  font-size: var(--font-size-2xl);
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 2px solid var(--color-border);
}

.document-content h2 {
  font-size: var(--font-size-xl);
  font-weight: 600;
  color: var(--color-primary);
  margin: var(--space-xl) 0 var(--space-md) 0;
}

.document-content h3 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin: var(--space-lg) 0 var(--space-md) 0;
}

.document-content p {
  margin-bottom: var(--space-md);
}

.document-content ul,
.document-content ol {
  margin: var(--space-md) 0 var(--space-md) var(--space-xl);
}

.document-content li {
  margin-bottom: var(--space-sm);
}

.document-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-lg) 0;
  font-size: var(--font-size-sm);
}

.document-content th,
.document-content td {
  padding: var(--space-md);
  text-align: left;
  border: 1px solid var(--color-border);
}

.document-content th {
  background: var(--color-bg-secondary);
  font-weight: 600;
}

.document-content blockquote {
  border-left: 4px solid var(--color-accent);
  padding-left: var(--space-lg);
  margin: var(--space-lg) 0;
  font-style: italic;
  color: var(--color-text-secondary);
}

.document-content hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-xl) 0;
}

.document-content .signature-line {
  border-bottom: 1px solid var(--color-text-primary);
  width: 250px;
  margin: var(--space-md) 0;
}

/* Legal Document Specific Styles */
.legal-header {
  text-align: center;
  margin-bottom: var(--space-xl);
}

.legal-header h1 {
  border-bottom: none;
  margin-bottom: var(--space-sm);
}

.legal-parties {
  margin: var(--space-lg) 0;
  padding: var(--space-lg);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
}

.email-message {
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
  border-left: 4px solid var(--color-primary);
}

.email-header {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--color-border);
}

.email-header strong {
  color: var(--color-text-primary);
}

/* Learning Objectives Box */
.learning-box {
  background: var(--color-success-bg);
  border: 1px solid var(--color-success);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-xl);
}

.learning-box h3 {
  color: var(--color-success);
  font-size: var(--font-size-base);
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.learning-box ul {
  margin: 0 0 0 var(--space-lg);
  color: var(--color-text-primary);
}

/* Phase Navigation */
.phase-nav {
  display: flex;
  justify-content: space-between;
  margin-top: var(--space-xl);
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.phase-nav a {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-md) var(--space-lg);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  text-decoration: none;
  font-weight: 500;
  transition: all var(--transition-fast);
}

.phase-nav a:hover {
  background: var(--color-bg-tertiary);
}

.phase-nav a.disabled {
  opacity: 0.5;
  pointer-events: none;
}

/* Footer */
.footer {
  background: var(--color-primary-dark);
  color: var(--color-text-light);
  padding: var(--space-xl);
  margin-top: var(--space-2xl);
}

.footer-content {
  max-width: 1400px;
  margin: 0 auto;
  text-align: center;
  font-size: var(--font-size-sm);
}

.footer a {
  color: var(--color-text-light);
}

/* Utility Classes */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center {
  text-align: center;
}

.mt-lg {
  margin-top: var(--space-lg);
}

.mb-lg {
  margin-bottom: var(--space-lg);
}

/* Print Styles */
@media print {
  .header,
  .sidebar,
  .phase-nav,
  .footer,
  .unlock-controls {
    display: none;
  }

  .main-container {
    display: block;
    max-width: 100%;
    padding: 0;
  }

  .content-area {
    box-shadow: none;
    border: none;
  }

  .document-content {
    max-width: 100%;
  }
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    text-align: center;
  }

  .header h1 {
    font-size: var(--font-size-lg);
  }

  .main-container {
    padding: var(--space-md);
    gap: var(--space-md);
  }

  .sidebar {
    position: static;
    max-height: none;
  }

  .content-body {
    padding: var(--space-lg);
  }

  .document-grid {
    grid-template-columns: 1fr;
  }

  .phase-nav {
    flex-direction: column;
    gap: var(--space-md);
  }

  .phase-nav a {
    justify-content: center;
  }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --color-border: #000000;
    --color-text-secondary: #1a1a2e;
  }

  .document-card,
  .sidebar-section,
  .content-area {
    border-width: 2px;
  }
}

/* Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html {
    scroll-behavior: auto;
  }
}