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

/* CSS Custom Properties */
:root {
  --color-background: #FFFFFF;
  --color-background-alt: #FAFAFA;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-border: #E5E5E5;
  --color-accent: #2C3E50;
  --color-accent-hover: #1A252F;
  --color-code-bg: #F5F5F5;

  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-serif: Georgia, 'Times New Roman', Times, serif;

  --max-width: 700px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
}

/* Smooth Scrolling */
html {
  scroll-behavior: smooth;
}

/* Body Typography */
body {
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* Hero Section */
.hero {
  background-color: var(--color-background);
  padding: var(--spacing-xxl) 0 var(--spacing-xl) 0;
  border-bottom: 1px solid var(--color-border);
  text-align: center;
}

.hero h1 {
  font-family: var(--font-sans);
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-accent);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  color: var(--color-text-light);
  line-height: 1.6;
  max-width: 600px;
  margin: 0 auto;
}

/* Main Content */
main {
  padding: var(--spacing-xl) 0;
}

.content {
  background-color: var(--color-background);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-accent);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.01em;
}

h2 {
  font-size: 1.875rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--spacing-sm);
}

h3 {
  font-size: 1.5rem;
  margin-top: var(--spacing-lg);
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--spacing-md);
  font-size: 1.0625rem;
}

/* Links */
a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

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

/* Lists */
ul, ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

ul li, ol li {
  margin-bottom: var(--spacing-xs);
  line-height: 1.7;
}

ol {
  list-style-type: decimal;
}

ul {
  list-style-type: disc;
}

/* Code */
code {
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.9em;
  background-color: var(--color-code-bg);
  padding: 0.125rem 0.375rem;
  border-radius: 3px;
  color: var(--color-text);
}

pre {
  background-color: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: var(--spacing-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
  line-height: 1.5;
}

pre code {
  background-color: transparent;
  padding: 0;
  font-size: 0.875rem;
}

/* Blockquotes */
blockquote {
  border-left: 3px solid var(--color-accent);
  padding-left: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  color: var(--color-text-light);
  font-style: italic;
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: var(--spacing-lg) 0;
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-lg) 0;
}

table th,
table td {
  padding: var(--spacing-sm);
  border: 1px solid var(--color-border);
  text-align: left;
}

table th {
  background-color: var(--color-background-alt);
  font-weight: 700;
  font-family: var(--font-sans);
}

/* Call-to-Action Section */
.cta {
  background-color: var(--color-background-alt);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-xxl) 0;
  margin-top: var(--spacing-xxl);
}

.cta-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
}

.cta-image {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  flex-shrink: 0;
  border: 2px solid var(--color-border);
  margin: 0;
}

.cta-text h2 {
  font-size: 1.75rem;
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
  border: none;
  padding: 0;
}

.cta-text p {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

.cta-button {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-background);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: 4px;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border: none;
  transition: background-color 0.2s ease, transform 0.1s ease;
}

.cta-button:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-1px);
  border-bottom: none;
}

/* Footer */
.footer {
  background-color: var(--color-background);
  border-top: 1px solid var(--color-border);
  padding: var(--spacing-lg) 0;
  margin-top: var(--spacing-xxl);
  text-align: center;
}

.footer p {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
  :root {
    --max-width: 100%;
    --spacing-xl: 2rem;
    --spacing-xxl: 2.5rem;
  }

  body {
    font-size: 17px;
  }

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

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

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

  .cta-content {
    flex-direction: column;
    text-align: center;
  }

  .cta-image {
    width: 100px;
    height: 100px;
  }

  pre {
    font-size: 0.8rem;
    padding: var(--spacing-sm);
  }

  table {
    font-size: 0.875rem;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 16px;
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .hero-subtitle {
    font-size: 0.9375rem;
  }

  h2 {
    font-size: 1.375rem;
  }

  h3 {
    font-size: 1.125rem;
  }
}

/* Print Styles */
@media print {
  body {
    background-color: white;
    color: black;
    font-size: 12pt;
  }

  .hero,
  .cta,
  .footer {
    background-color: white;
    border: none;
  }

  .cta-button {
    background-color: transparent;
    color: black;
    border: 1px solid black;
  }

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

  pre {
    border: 1px solid black;
    background-color: white;
  }
}