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

/* CSS Custom Properties */
:root {
  /* Colors - Neutral with white cells for Bento Grid */
  --color-background: #f5f5f7;
  --color-card-bg: #ffffff;
  --color-text-primary: #1d1d1f;
  --color-text-secondary: #6e6e73;
  --color-accent: #0071e3;
  --color-accent-hover: #0077ed;
  --color-border: #d2d2d7;
  --color-highlight: #f5f5f7;
  --color-danger: #ff3b30;
  --color-danger-bg: #fff5f4;

  /* Typography */
  --font-family-base: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-base: 16px;
  --font-size-large: 18px;
  --font-size-small: 14px;
  --line-height-base: 1.6;
  --line-height-heading: 1.3;

  /* Spacing */
  --spacing-xs: 8px;
  --spacing-sm: 16px;
  --spacing-md: 24px;
  --spacing-lg: 32px;
  --spacing-xl: 48px;
  --spacing-xxl: 64px;

  /* Grid */
  --grid-gap: 20px;
  --grid-columns: 12;

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

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
}

html {
  scroll-behavior: smooth;
  font-size: var(--font-size-base);
}

body {
  font-family: var(--font-family-base);
  line-height: var(--line-height-base);
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: var(--spacing-md);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--line-height-heading);
  margin-bottom: var(--spacing-md);
  color: var(--color-text-primary);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  letter-spacing: -0.02em;
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-primary);
}

p:last-child {
  margin-bottom: 0;
}

strong {
  font-weight: 600;
  color: var(--color-text-primary);
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-accent-hover);
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--color-card-bg) 0%, #fafafa 100%);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xxl) var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--color-border);
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.hero h1 {
  margin-bottom: var(--spacing-sm);
}

.hero-subtitle {
  font-size: var(--font-size-large);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
  font-weight: 500;
}

.hero-hook {
  font-size: var(--font-size-large);
  color: var(--color-text-primary);
  max-width: 700px;
  margin: 0 auto;
  line-height: 1.7;
}

/* Bento Grid Layout */
.bento-grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: var(--grid-gap);
  margin-bottom: var(--spacing-xl);
}

/* Grid Item Base Styles */
.grid-item {
  background-color: var(--color-card-bg);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.card-content h2 {
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-highlight);
}

/* Bento Grid Size Variations - Asymmetric Layout */

/* Large cards - 8 columns */
.large-card {
  grid-column: span 8;
}

/* Medium cards - 6 columns */
.medium-card {
  grid-column: span 6;
}

/* Wide cards - 12 columns (full width) */
.wide-card {
  grid-column: span 12;
}

/* Tall cards - 4 columns with more padding */
.tall-card {
  grid-column: span 4;
  padding: var(--spacing-xl);
}

/* Highlight Card - Special styling for important content */
.highlight-card {
  background: linear-gradient(135deg, #f0f9ff 0%, var(--color-card-bg) 100%);
  border: 2px solid var(--color-accent);
}

.highlight-card h2 {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* Danger Card - Warning styling for critical limitation */
.danger-card {
  background: linear-gradient(135deg, var(--color-danger-bg) 0%, var(--color-card-bg) 100%);
  border: 2px solid var(--color-danger);
}

.danger-card h2 {
  color: var(--color-danger);
  border-bottom-color: var(--color-danger);
}

.danger-label {
  font-weight: 600;
  color: var(--color-danger);
  font-style: italic;
  margin-bottom: var(--spacing-md);
}

/* Call to Action Section */
.cta-section {
  background-color: var(--color-card-bg);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-xxl) var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.cta-container {
  max-width: 1000px;
  margin: 0 auto;
}

.cta-content {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--spacing-xl);
  align-items: start;
}

.cta-image-wrapper {
  position: relative;
}

.cta-image {
  width: 100%;
  height: auto;
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
  border: 3px solid var(--color-border);
}

.cta-text h2 {
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-primary);
}

.cta-subtitle {
  font-size: var(--font-size-large);
  color: var(--color-accent);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.cta-highlights {
  margin: var(--spacing-md) 0;
  padding: var(--spacing-md);
  background-color: var(--color-highlight);
  border-radius: var(--border-radius-sm);
  border-left: 4px solid var(--color-accent);
}

.cta-highlights ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.cta-highlights li {
  padding: var(--spacing-xs) 0;
  padding-left: var(--spacing-md);
  position: relative;
  color: var(--color-text-primary);
}

.cta-highlights li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-accent);
  font-weight: bold;
  font-size: 1.2em;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-accent);
  color: white;
  border-radius: var(--border-radius-sm);
  font-weight: 600;
  font-size: var(--font-size-large);
  transition: background-color 0.2s ease, transform 0.2s ease;
  margin-top: var(--spacing-md);
  box-shadow: var(--shadow-sm);
}

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

.cta-button svg {
  transition: transform 0.2s ease;
}

.cta-button:hover svg {
  transform: translateX(4px);
}

/* Footer */
.footer {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  color: var(--color-text-secondary);
  font-size: var(--font-size-small);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-card-bg);
  border-radius: var(--border-radius-md);
}

.footer p {
  margin-bottom: var(--spacing-xs);
}

/* Responsive Design - Tablet */
@media (max-width: 1024px) {
  .bento-grid {
    grid-template-columns: repeat(8, 1fr);
  }

  .large-card {
    grid-column: span 8;
  }

  .medium-card {
    grid-column: span 8;
  }

  .wide-card {
    grid-column: span 8;
  }

  .tall-card {
    grid-column: span 8;
  }

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

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

  .hero {
    padding: var(--spacing-lg) var(--spacing-md);
    margin-bottom: var(--spacing-lg);
  }

  .bento-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
  }

  .grid-item,
  .large-card,
  .medium-card,
  .wide-card,
  .tall-card {
    grid-column: span 1;
    padding: var(--spacing-md);
  }

  .cta-section {
    padding: var(--spacing-lg) var(--spacing-md);
  }

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

  .cta-image-wrapper {
    max-width: 200px;
    margin: 0 auto;
  }

  .cta-button {
    width: 100%;
    justify-content: center;
  }
}

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

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

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

  .cta-button {
    display: none;
  }

  a {
    color: black;
    text-decoration: underline;
  }

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

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

/* Focus Styles for Keyboard Navigation */
a:focus,
button:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
  :root {
    --color-border: #000;
    --color-text-secondary: #000;
  }

  .grid-item,
  .hero,
  .cta-section {
    border-width: 2px;
  }
}