/* Basic reset and foundation styles */
* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #333;
  background-color: #fff;
}

h1, h2, h3, h4, h5, h6 {
  margin-top: 1.5em;
  margin-bottom: 0.5em;
  font-weight: 600;
  line-height: 1.25;
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }
h5 { font-size: 0.875rem; }
h6 { font-size: 0.85rem; }

p {
  margin-top: 0;
  margin-bottom: 1rem;
}

a {
  color: #0066cc;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.875em;
  background-color: #f3f4f6;
  padding: 0.2em 0.4em;
  border-radius: 3px;
}

pre {
  background-color: #f6f8fa;
  border-radius: 6px;
  padding: 1rem;
  overflow-x: auto;
  margin: 1rem 0;
}

pre code {
  background-color: transparent;
  padding: 0;
}

blockquote {
  margin: 1rem 0;
  padding: 0 1rem;
  border-left: 3px solid #0066cc;
  color: #666;
}

/* Tables */
table {
  border-collapse: collapse;
  width: 100%;
  margin: 1rem 0;
}

table th,
table td {
  padding: 0.5rem;
  border: 1px solid #e1e4e8;
  text-align: left;
}

table th {
  background-color: #f6f8fa;
  font-weight: 600;
}

/* Lists */
ul, ol {
  margin-top: 0;
  margin-bottom: 1rem;
  padding-left: 2rem;
}

li {
  margin-bottom: 0.25rem;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
}

/* Utility classes */
.hidden {
  display: none;
}

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

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

/* Override any conflicting styles from custom-head.html */

/* Reference page styles */
.reference-intro {
  background-color: #f0f7ff;
  border: 1px solid #b3d9ff;
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  font-size: 1.1em;
}

.reference-card {
  background-color: #f9fafb;
  border: 1px solid #e5e7eb;
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.5rem 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.reference-card h4 {
  margin-top: 0;
  margin-bottom: 1rem;
  color: #1f2937;
  border-bottom: 2px solid #e5e7eb;
  padding-bottom: 0.5rem;
}

.reference-card pre {
  background-color: #1f2937;
  color: #f9fafb;
  padding: 1rem;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 0.875em;
  line-height: 1.5;
}

.reference-card pre code {
  color: #f9fafb;
  background-color: transparent;
}

.reference-card table {
  font-size: 0.9em;
  margin-top: 0.5rem;
}

.reference-card table th {
  background-color: #e5e7eb;
  font-weight: 600;
  white-space: nowrap;
}

.reference-card table td {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.85em;
}

.reference-card ul {
  margin: 0.5rem 0;
  padding-left: 1.5rem;
}

.reference-card li {
  margin-bottom: 0.5rem;
}

.reference-card input[type="checkbox"] {
  margin-right: 0.5rem;
}

.reference-footer {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid #e5e7eb;
  text-align: center;
  color: #6b7280;
  font-style: italic;
}

/* Command syntax highlighting */
.reference-card .language-bash {
  background-color: #1f2937;
}

.reference-card .language-python {
  background-color: #282c34;
}

.reference-card .language-json {
  background-color: #2d2d2d;
}

/* Quick links section */
.reference-card h3 + ul {
  list-style: none;
  padding-left: 0;
}

.reference-card h3 + ul li {
  display: inline-block;
  margin-right: 1rem;
  margin-bottom: 0.5rem;
}

/* Responsive design for reference cards */
@media (max-width: 768px) {
  .reference-card {
    padding: 1rem;
    margin: 1rem -0.5rem;
  }

  .reference-card pre {
    font-size: 0.8em;
  }

  .reference-card table {
    font-size: 0.8em;
  }
}

/* ============================================
   Key Insights Cards - Used across all pages
   ============================================ */

.key-insights {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-top: 1.5rem;
}

.insight-card {
  flex: 1;
  min-width: 200px;
  max-width: 300px;
  background: #f8f9fa;
  padding: 1rem;
  border-radius: 8px;
  text-align: center;
  border: 1px solid #e9ecef;
}

.insight-card i {
  font-size: 1.5rem;
  color: #4facfe;
  display: block;
  margin-bottom: 0.5rem;
}

.insight-card h4 {
  margin: 0.5rem 0 0.25rem 0;
  font-size: 1rem;
  color: #333;
}

.insight-card p {
  margin: 0;
  font-size: 0.9rem;
  color: #666;
}

/* ============================================
   Intro Card Styling
   ============================================ */

.intro-card {
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 8px;
  padding: 1.5rem;
  margin-bottom: 2rem;
}

.intro-card .lead-text {
  font-size: 1.1rem;
  line-height: 1.6;
  color: #333;
  margin-bottom: 1rem;
}

/* ============================================
   AI Type Cards
   ============================================ */

.ai-types-section {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.ai-type-card {
  flex: 1;
  min-width: 280px;
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 8px;
  padding: 1.5rem;
}

.ai-type-card h3 {
  margin-top: 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.ai-type-card.narrow-ai {
  border-left: 4px solid #28a745;
}

.ai-type-card.general-ai {
  border-left: 4px solid #ffc107;
}

/* ============================================
   ML Type Cards
   ============================================ */

.ml-types-section {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.ml-type-card {
  flex: 1;
  min-width: 280px;
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 8px;
  padding: 1.5rem;
}

.ml-type-card h4 {
  margin-top: 0;
}

.ml-type-card.supervised {
  border-left: 4px solid #007bff;
}

.ml-type-card.unsupervised {
  border-left: 4px solid #17a2b8;
}

.ml-type-card.reinforcement {
  border-left: 4px solid #6f42c1;
}

/* ============================================
   Algorithm Cards
   ============================================ */

.algorithm-card {
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1rem 0;
}

.algorithm-card h4 {
  margin-top: 0;
  color: #333;
}

/* ============================================
   Architecture Cards
   ============================================ */

.architecture-cards {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.arch-card {
  flex: 1;
  min-width: 280px;
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 8px;
  padding: 1.5rem;
}

.arch-card h4 {
  margin-top: 0;
}

.arch-card.cnn {
  border-left: 4px solid #e74c3c;
}

.arch-card.rnn {
  border-left: 4px solid #3498db;
}

.arch-card.lstm {
  border-left: 4px solid #9b59b6;
}

.arch-card.transformer {
  border-left: 4px solid #1abc9c;
}

/* ============================================
   Challenge Cards
   ============================================ */

.challenge-cards {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 1rem 0;
}

.challenge-card {
  flex: 1;
  min-width: 200px;
  background: #fff3cd;
  border: 1px solid #ffc107;
  border-radius: 8px;
  padding: 1rem;
}

.challenge-card h4 {
  margin-top: 0;
  font-size: 0.95rem;
}

.challenge-card p {
  margin-bottom: 0;
  font-size: 0.9rem;
}

/* ============================================
   Step Cards (for processes/pipelines)
   ============================================ */

.step-card {
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 8px;
  padding: 1rem;
  margin: 0.5rem 0;
}

.step-card h4 {
  margin-top: 0;
  font-size: 0.95rem;
}

/* ============================================
   Mathematical Foundations Section
   ============================================ */

.mathematical-foundations {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 1.5rem;
  border-radius: 8px;
  margin: 1rem 0;
}

.mathematical-foundations h3 {
  color: white;
  margin-top: 0;
}

.mathematical-foundations p {
  margin-bottom: 0;
  opacity: 0.95;
}

/* ============================================
   Responsive adjustments for cards
   ============================================ */

@media (max-width: 768px) {
  .key-insights {
    flex-direction: column;
  }

  .insight-card {
    max-width: none;
  }

  .ai-types-section,
  .ml-types-section,
  .architecture-cards,
  .challenge-cards {
    flex-direction: column;
  }

  .ai-type-card,
  .ml-type-card,
  .arch-card,
  .challenge-card {
    min-width: auto;
  }
}

/* ============================================
   Hero Section (for pages without inline styles)
   ============================================ */

.hero-section {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  color: white;
  padding: 3rem 2rem;
  margin: -2rem -3rem 2rem -3rem;
  text-align: center;
}

.hero-section h1 {
  color: white;
  margin: 0;
  font-size: 2.5rem;
}

.hero-section p {
  font-size: 1.25rem;
  margin-top: 1rem;
  opacity: 0.9;
}

/* ============================================
   Generic Card Styles
   ============================================ */

.feature-card,
.driver-card,
.tip-card,
.takeaway-card,
.principle-card,
.phenomenon-card,
.pattern-card,
.example-card,
.postulate-card,
.exponent-card,
.nav-card,
.theory-card,
.transition-card,
.string-card,
.stat-card {
  background: #f8f9fa;
  border: 1px solid #e9ecef;
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1rem 0;
}

.feature-card h4,
.driver-card h4,
.tip-card h4,
.takeaway-card h4,
.principle-card h4,
.phenomenon-card h4,
.pattern-card h4,
.example-card h4,
.postulate-card h4,
.exponent-card h4,
.nav-card h4,
.theory-card h4,
.transition-card h4,
.string-card h4,
.stat-card h4 {
  margin-top: 0;
  color: #333;
}

/* Colored accent borders for variety */
.tip-card {
  border-left: 4px solid #17a2b8;
  background: #e7f5ff;
}

.takeaway-card {
  border-left: 4px solid #28a745;
  background: #d4edda;
}

.principle-card {
  border-left: 4px solid #6f42c1;
}

.pattern-card {
  border-left: 4px solid #fd7e14;
}

.postulate-card {
  border-left: 4px solid #007bff;
  background: #e7f1ff;
}

/* ============================================
   See Also Card
   ============================================ */

.see-also-card {
  background: #f0f7ff;
  border: 1px solid #b3d9ff;
  border-radius: 8px;
  padding: 1.5rem;
  margin: 2rem 0;
}

.see-also-card h4 {
  margin-top: 0;
  color: #0066cc;
}

/* ============================================
   Quick Start Cards
   ============================================ */

.quick-start-card {
  background: #f8f9fa;
  border-radius: 8px;
  padding: 1.5rem;
  border: 1px solid #e9ecef;
}

.quick-start-card h3 {
  margin-top: 0;
  color: #495057;
}

/* ============================================
   Grid Layouts
   ============================================ */

.command-grid,
.theories-grid,
.takeaway-grid,
.pros-cons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 1.5rem 0;
}

.tip-cards {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 1rem 0;
}

/* ============================================
   Pros/Cons Sections
   ============================================ */

.pros-section,
.cons-section {
  padding: 1.5rem;
  border-radius: 8px;
  margin: 1rem 0;
}

.pros-section {
  background: #d4edda;
  border: 1px solid #c3e6cb;
}

.cons-section {
  background: #f8d7da;
  border: 1px solid #f5c6cb;
}

.pros-section h4,
.cons-section h4 {
  margin-top: 0;
}

/* ============================================
   Example Section
   ============================================ */

.example-section {
  background: #fff3cd;
  border: 1px solid #ffc107;
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.example-section h4 {
  margin-top: 0;
  color: #856404;
}

/* ============================================
   CTA Section
   ============================================ */

.cta-section {
  text-align: center;
  margin: 3rem 0;
  padding: 2rem;
  background: #f8f9fa;
  border-radius: 8px;
}

.cta-section h2 {
  margin-top: 0;
}

/* ============================================
   Troubleshooting Section
   ============================================ */

.troubleshooting-section {
  background: #fff3cd;
  border: 1px solid #ffc107;
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.5rem 0;
}

/* ============================================
   Storage Section
   ============================================ */

.storage-section {
  background: #e7f5ff;
  border: 1px solid #b3d9ff;
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.5rem 0;
}

/* ============================================
   Responsive adjustments for new elements
   ============================================ */

@media (max-width: 768px) {
  .command-grid,
  .theories-grid,
  .takeaway-grid,
  .pros-cons-grid {
    grid-template-columns: 1fr;
  }

  .hero-section {
    margin: -1rem -1rem 1.5rem -1rem;
    padding: 2rem 1rem;
  }

  .hero-section h1 {
    font-size: 1.75rem;
  }

  .hero-section p {
    font-size: 1rem;
  }
}