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

:root {
  /* Color Variables */
  --color-background: #FAFAFA;
  --color-surface: #FFFFFF;
  --color-text-primary: #333333;
  --color-text-secondary: #666666;
  --color-border: #E5E5E5;
  --color-accent: #2563EB;
  --color-accent-hover: #1D4ED8;

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

  /* Spacing Variables */
  --container-max-width: 720px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;
}

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

body {
  font-family: var(--font-serif);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-primary);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: var(--spacing-lg);
  background-color: var(--color-surface);
  min-height: 100vh;
}

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

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

.hero-subtitle {
  font-family: var(--font-sans);
  font-size: 1.125rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* Article Content */
.article-content {
  padding: var(--spacing-lg) 0;
}

.article-content h2 {
  font-family: var(--font-sans);
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text-primary);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.01em;
}

.article-content h3 {
  font-family: var(--font-sans);
  font-size: 1.375rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text-primary);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

.article-content p {
  margin-bottom: var(--spacing-md);
  text-align: left;
}

.article-content p:first-child {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

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

.article-content ul,
.article-content ol {
  margin: var(--spacing-md) 0;
  padding-left: var(--spacing-lg);
}

.article-content li {
  margin-bottom: var(--spacing-sm);
}

.article-content code {
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Fira Code', monospace;
  font-size: 0.9em;
  background-color: #F5F5F5;
  padding: 0.2em 0.4em;
  border-radius: 3px;
  color: #C7254E;
}

.article-content pre {
  background-color: #F5F5F5;
  padding: var(--spacing-md);
  border-radius: 6px;
  overflow-x: auto;
  margin: var(--spacing-md) 0;
  border: 1px solid var(--color-border);
}

.article-content pre code {
  background-color: transparent;
  padding: 0;
  color: var(--color-text-primary);
}

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

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-md) 0;
}

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

.article-content th {
  font-family: var(--font-sans);
  font-weight: 600;
  background-color: #F5F5F5;
}

.article-content img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: var(--spacing-lg) auto;
  border-radius: 6px;
}

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

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

/* Call-to-Action Section */
.cta-section {
  margin-top: var(--spacing-xxl);
  padding: var(--spacing-xl);
  background-color: #F9FAFB;
  border-radius: 8px;
  border: 1px solid var(--color-border);
}

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

.cta-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 3px solid var(--color-surface);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.cta-text h2 {
  font-family: var(--font-sans);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.cta-text p {
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
}

.cta-button {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--color-accent);
  color: var(--color-surface);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  border-radius: 6px;
  transition: background-color 0.2s ease, transform 0.1s ease;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.cta-button:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

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

/* Footer */
.footer {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: var(--spacing-lg);
  text-align: center;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface);
}

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

  .container {
    padding: var(--spacing-md);
  }

  .hero {
    padding: var(--spacing-lg) 0;
  }

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

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

  .article-content h2 {
    font-size: 1.5rem;
  }

  .article-content h3 {
    font-size: 1.25rem;
  }

  body {
    font-size: 1rem;
  }

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

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

@media (min-width: 769px) {
  .cta-content {
    flex-direction: row;
    text-align: left;
  }

  .cta-text {
    flex: 1;
  }
}

@media (min-width: 1024px) {
  .hero h1 {
    font-size: 2.5rem;
  }

  .article-content h2 {
    font-size: 2rem;
  }
}

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

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

  .cta-button {
    background-color: transparent;
    color: black;
    border: 2px solid black;
  }

  .cta-section {
    page-break-inside: avoid;
  }

  a {
    text-decoration: underline;
  }

  .hero {
    border-bottom: 2px solid black;
  }
}