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

:root {
  /* Color Palette - Neutral with subtle accents */
  --color-bg: #f5f5f7;
  --color-surface: #ffffff;
  --color-text-primary: #1d1d1f;
  --color-text-secondary: #515154;
  --color-accent: #0066cc;
  --color-accent-hover: #0052a3;
  --color-border: #d2d2d7;
  --color-highlight: #f9f9fb;

  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.1);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-primary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Bento Grid Container */
.bento-container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-lg);
  display: grid;
  gap: var(--spacing-lg);
  grid-template-columns: repeat(12, 1fr);
}

/* Hero Section - Full Width */
.bento-hero {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl) var(--spacing-xl);
  color: white;
  box-shadow: var(--shadow-lg);
  min-height: 300px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-content {
  max-width: 900px;
  text-align: center;
}

.bento-hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: var(--font-weight-bold);
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.25rem);
  font-weight: var(--font-weight-normal);
  line-height: 1.5;
  opacity: 0.95;
  max-width: 800px;
  margin: 0 auto;
}

/* Article Grid Container */
.bento-article {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--spacing-lg);
}

/* Intro Section - Spans 8 columns */
.bento-intro {
  grid-column: span 12;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.bento-intro p {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

/* Standard Section - Spans 6 columns */
.bento-section {
  grid-column: span 12;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  padding: var(--spacing-xl);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

/* Wide Section - Spans 12 columns */
.bento-section.bento-wide {
  grid-column: span 12;
}

/* Highlight Section - Special styling */
.bento-section.bento-highlight {
  grid-column: span 12;
  background: var(--color-highlight);
  border: 2px solid var(--color-accent);
}

/* Typography within sections */
.bento-section h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: var(--font-weight-bold);
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

.bento-section h3 {
  font-size: 1.25rem;
  font-weight: var(--font-weight-semibold);
  line-height: 1.4;
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

.bento-section p {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.bento-section p:last-child {
  margin-bottom: 0;
}

/* Capability Cards - Nested Grid */
.capability-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
}

.capability-card:last-of-type {
  margin-bottom: var(--spacing-md);
}

.capability-card h3 {
  font-size: 1.125rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
  margin-bottom: var(--spacing-xs);
}

.capability-card p {
  margin-bottom: 0;
  font-size: 0.95rem;
}

/* Insight Text */
.insight {
  font-style: italic;
  color: var(--color-text-primary);
  background: var(--color-surface);
  padding: var(--spacing-md);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--radius-sm);
  margin-top: var(--spacing-md);
}

/* Lessons Grid */
.lessons-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-md);
  margin: var(--spacing-lg) 0;
}

.lesson-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.lesson-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.lesson-card h3 {
  font-size: 1.125rem;
  font-weight: var(--font-weight-semibold);
  color: var(--color-accent);
  margin-bottom: var(--spacing-sm);
}

.lesson-card p {
  font-size: 0.95rem;
  margin-bottom: 0;
}

/* Call-to-Action Section */
.bento-cta {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  border-radius: var(--radius-lg);
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-lg);
  color: white;
  margin-top: var(--spacing-lg);
}

.cta-content {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  max-width: 1100px;
  margin: 0 auto;
}

.cta-image img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid rgba(255, 255, 255, 0.2);
  box-shadow: var(--shadow-lg);
}

.cta-text h2 {
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-xs);
}

.cta-subtitle {
  font-size: 1.125rem;
  font-weight: var(--font-weight-medium);
  color: rgba(255, 255, 255, 0.8);
  margin-bottom: var(--spacing-md);
}

.cta-text p {
  font-size: 1rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-md);
}

.cta-highlight {
  font-size: 1.0625rem;
  font-weight: var(--font-weight-medium);
  color: #ffd700;
  background: rgba(255, 215, 0, 0.1);
  padding: var(--spacing-md);
  border-radius: var(--radius-sm);
  border-left: 4px solid #ffd700;
}

.cta-button {
  display: inline-block;
  background: white;
  color: var(--color-accent);
  font-size: 1.0625rem;
  font-weight: var(--font-weight-semibold);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: var(--shadow-md);
  margin-top: var(--spacing-sm);
}

.cta-button:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
  background: var(--color-highlight);
}

.cta-button:active {
  transform: translateY(0);
}

/* Footer */
.site-footer {
  grid-column: 1 / -1;
  text-align: center;
  padding: var(--spacing-lg);
  color: var(--color-text-secondary);
  font-size: 0.875rem;
}

/* Responsive Design - Tablet */
@media (max-width: 1024px) {
  .bento-container {
    padding: var(--spacing-md);
    gap: var(--spacing-md);
  }

  .bento-hero {
    padding: var(--spacing-xl) var(--spacing-lg);
    min-height: 250px;
  }

  .bento-section {
    grid-column: span 12;
    padding: var(--spacing-lg);
  }

  .bento-section.bento-wide {
    grid-column: span 12;
  }

  .cta-content {
    grid-template-columns: 150px 1fr;
    gap: var(--spacing-lg);
  }

  .cta-image img {
    width: 150px;
    height: 150px;
  }

  .lessons-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  }
}

/* Responsive Design - Mobile */
@media (max-width: 768px) {
  .bento-container {
    padding: var(--spacing-sm);
    gap: var(--spacing-sm);
  }

  .bento-hero {
    padding: var(--spacing-lg) var(--spacing-md);
    min-height: 200px;
  }

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

  .hero-subtitle {
    font-size: 1rem;
  }

  .bento-intro {
    padding: var(--spacing-lg);
  }

  .bento-intro p {
    font-size: 1rem;
  }

  .bento-section {
    grid-column: span 12;
    padding: var(--spacing-md);
  }

  .bento-section h2 {
    font-size: 1.5rem;
  }

  .cta-content {
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
    text-align: center;
  }

  .cta-image {
    display: flex;
    justify-content: center;
  }

  .cta-image img {
    width: 120px;
    height: 120px;
  }

  .cta-text h2 {
    font-size: 1.75rem;
  }

  .cta-button {
    display: block;
    text-align: center;
    width: 100%;
  }

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

/* Print Styles */
@media print {
  body {
    background: white;
    color: black;
  }

  .bento-container {
    max-width: 100%;
    padding: 0;
  }

  .bento-hero,
  .bento-section,
  .bento-cta {
    box-shadow: none;
    border: 1px solid #ccc;
    page-break-inside: avoid;
  }

  .bento-hero {
    background: #667eea;
    color: white;
  }

  .bento-cta {
    background: #1a1a2e;
    color: white;
  }

  .cta-button {
    display: none;
  }

  .site-footer {
    margin-top: 2rem;
    border-top: 1px solid #ccc;
    padding-top: 1rem;
  }

  a {
    text-decoration: underline;
  }

  a[href]:after {
    content: " (" attr(href) ")";
    font-size: 0.8em;
  }
}