/* CSS Reset & Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* CSS Custom Properties */
:root {
  --color-primary: #0066CC;
  --color-primary-dark: #003366;
  --color-primary-light: #4D94D9;
  --color-text: #1a1a1a;
  --color-text-light: #4a4a4a;
  --color-background: #ffffff;
  --color-background-alt: #f8f9fa;
  --color-border: #e1e4e8;
  --color-shadow: rgba(0, 0, 0, 0.1);
  --color-shadow-hover: rgba(0, 0, 0, 0.15);

  --font-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Helvetica Neue", Arial, sans-serif;
  --font-secondary: "SF Pro Display", -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", sans-serif;

  --container-width: 1000px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;

  --shadow-sm: 0 1px 3px var(--color-shadow);
  --shadow-md: 0 4px 6px var(--color-shadow);
  --shadow-lg: 0 10px 25px var(--color-shadow);
}

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

/* Body */
body {
  font-family: var(--font-primary);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-background);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
  color: var(--color-background);
  padding: var(--spacing-xxl) 0;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.hero-title {
  font-family: var(--font-secondary);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: 1.25rem;
  line-height: 1.5;
  opacity: 0.95;
  max-width: 800px;
  margin: 0 auto;
  font-weight: 400;
}

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

article {
  max-width: 800px;
  margin: 0 auto;
}

/* Typography */
.lead {
  font-size: 1.25rem;
  line-height: 1.7;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-lg);
  font-weight: 400;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-secondary);
  font-weight: 700;
  line-height: 1.3;
  color: var(--color-text);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
  color: var(--color-primary-dark);
  padding-bottom: var(--spacing-xs);
  border-bottom: 3px solid var(--color-primary);
}

h3 {
  font-size: 1.5rem;
  color: var(--color-primary);
}

h4 {
  font-size: 1.25rem;
}

h5 {
  font-size: 1.125rem;
}

h6 {
  font-size: 1rem;
}

p {
  margin-bottom: var(--spacing-md);
  line-height: 1.7;
  color: var(--color-text);
}

/* 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;
  color: var(--color-text);
}

ul {
  list-style-type: disc;
}

ol {
  list-style-type: decimal;
}

/* Blockquotes */
blockquote {
  margin: var(--spacing-lg) 0;
  padding: var(--spacing-md) var(--spacing-lg);
  border-left: 4px solid var(--color-primary);
  background-color: var(--color-background-alt);
  font-style: italic;
  color: var(--color-text-light);
  box-shadow: var(--shadow-sm);
}

blockquote p {
  margin-bottom: 0;
  font-size: 1.125rem;
  line-height: 1.6;
}

/* Code Blocks */
code {
  font-family: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;
  font-size: 0.9em;
  background-color: var(--color-background-alt);
  padding: 0.2em 0.4em;
  border-radius: 3px;
  color: var(--color-primary-dark);
}

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

pre code {
  background-color: transparent;
  padding: 0;
  font-size: 0.875rem;
  line-height: 1.5;
  color: var(--color-text);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-md);
  background-color: var(--color-background);
  box-shadow: var(--shadow-sm);
}

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

th {
  background-color: var(--color-primary-dark);
  color: var(--color-background);
  font-weight: 600;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

tr:nth-child(even) {
  background-color: var(--color-background-alt);
}

tr:hover {
  background-color: rgba(0, 102, 204, 0.05);
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: var(--spacing-lg) auto;
  border-radius: 4px;
  box-shadow: var(--shadow-md);
}

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

.cta-content {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: var(--spacing-xl);
  align-items: center;
  background-color: var(--color-background);
  padding: var(--spacing-xl);
  border-radius: 8px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--color-border);
}

.cta-image img {
  width: 180px;
  height: 180px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-primary);
  box-shadow: var(--shadow-md);
}

.cta-text h2 {
  font-size: 2rem;
  color: var(--color-primary-dark);
  margin-top: 0;
  margin-bottom: var(--spacing-xs);
  border: none;
  padding: 0;
}

.cta-subtitle {
  font-size: 1.125rem;
  color: var(--color-primary);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.cta-text p {
  margin-bottom: var(--spacing-md);
  line-height: 1.6;
  color: var(--color-text-light);
}

.cta-button {
  display: inline-block;
  background-color: var(--color-primary);
  color: var(--color-background);
  padding: var(--spacing-sm) var(--spacing-xl);
  text-decoration: none;
  border-radius: 4px;
  font-weight: 600;
  font-size: 1.125rem;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-md);
  margin-top: var(--spacing-md);
  text-align: center;
  border: 2px solid var(--color-primary);
}

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

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

/* Footer */
.footer {
  background-color: var(--color-primary-dark);
  color: var(--color-background);
  padding: var(--spacing-lg) 0;
  text-align: center;
  font-size: 0.9rem;
}

.footer p {
  margin: 0;
  color: var(--color-background);
  opacity: 0.9;
}

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

  .hero-title {
    font-size: 1.875rem;
  }

  .hero-subtitle {
    font-size: 1.125rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  h3 {
    font-size: 1.375rem;
  }

  .lead {
    font-size: 1.125rem;
  }

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

  .cta-image img {
    margin: 0 auto;
  }

  table {
    font-size: 0.875rem;
  }

  th, td {
    padding: var(--spacing-xs);
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

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

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

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

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

  .cta-button {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 1rem;
    width: 100%;
  }
}

/* Print Styles */
@media print {
  .hero {
    background: var(--color-background);
    color: var(--color-text);
    box-shadow: none;
  }

  .cta, .footer {
    display: none;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
  }

  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
    color: var(--color-text);
  }

  blockquote, pre, table {
    page-break-inside: avoid;
  }

  a {
    color: var(--color-text);
    text-decoration: underline;
  }

  img {
    max-width: 100%;
    page-break-inside: avoid;
  }
}