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

/* CSS Custom Properties */
:root {
  /* Dark Mode Colors */
  --color-bg-primary: #121212;
  --color-bg-elevated: #1E1E1E;
  --color-bg-elevated-hover: #252525;
  --color-text-primary: #E0E0E0;
  --color-text-secondary: #B0B0B0;
  --color-text-muted: #808080;
  --color-accent: #6366F1;
  --color-accent-hover: #4F46E5;
  --color-accent-light: #818CF8;

  /* Typography */
  --font-family-primary: -apple-system, BlinkMacSystemFont, "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
  --font-family-heading: var(--font-family-primary);

  /* Spacing */
  --container-max-width: 900px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.7);

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

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

body {
  font-family: var(--font-family-primary);
  font-size: 18px;
  line-height: 1.7;
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #1E1E1E 0%, #121212 100%);
  padding: var(--spacing-2xl) 0;
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-md);
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--color-accent-light);
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

.hero-tagline {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  font-style: italic;
}

/* Article Content */
.article-content {
  background-color: var(--color-bg-primary);
  padding: var(--spacing-2xl) 0;
}

article {
  background-color: var(--color-bg-elevated);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* Typography */
.lead {
  font-size: 1.25rem;
  line-height: 1.8;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  font-weight: 400;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  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;
}

h1 {
  font-size: 2.5rem;
}

h2 {
  font-size: 2rem;
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: var(--spacing-xs);
  margin-top: var(--spacing-2xl);
}

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

h4 {
  font-size: 1.25rem;
}

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

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

em {
  font-style: italic;
  color: var(--color-text-secondary);
}

/* Links */
a {
  color: var(--color-accent-light);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

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

li {
  margin-bottom: var(--spacing-xs);
  color: var(--color-text-primary);
}

/* Code */
code {
  background-color: var(--color-bg-primary);
  color: var(--color-accent-light);
  padding: 0.2em 0.4em;
  border-radius: var(--radius-sm);
  font-family: "Menlo", "Monaco", "Courier New", monospace;
  font-size: 0.9em;
}

pre {
  background-color: var(--color-bg-primary);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

pre code {
  background-color: transparent;
  padding: 0;
  color: var(--color-text-primary);
  font-size: 0.95em;
  line-height: 1.6;
}

/* Blockquotes */
blockquote {
  border-left: 4px solid var(--color-accent);
  padding-left: var(--spacing-md);
  margin: var(--spacing-lg) 0;
  font-style: italic;
  color: var(--color-text-secondary);
  background-color: var(--color-bg-primary);
  padding: var(--spacing-md);
  border-radius: var(--radius-sm);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-lg);
  background-color: var(--color-bg-elevated);
  border-radius: var(--radius-md);
  overflow: hidden;
}

th, td {
  padding: var(--spacing-sm);
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

th {
  background-color: var(--color-bg-primary);
  font-weight: 600;
  color: var(--color-text-primary);
}

tr:last-child td {
  border-bottom: none;
}

tr:hover {
  background-color: var(--color-bg-elevated-hover);
}

/* Images */
img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: var(--spacing-md) 0;
}

/* Call-to-Action Section */
.cta {
  background: linear-gradient(135deg, #1E1E1E 0%, #252525 100%);
  padding: var(--spacing-2xl) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-lg);
}

.cta-content {
  display: flex;
  align-items: center;
  gap: var(--spacing-xl);
  background-color: var(--color-bg-elevated);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.cta-image {
  width: 150px;
  height: 150px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-accent);
  box-shadow: var(--shadow-md);
  flex-shrink: 0;
}

.cta-text {
  flex: 1;
}

.cta-title {
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-text-primary);
  margin-top: 0;
  margin-bottom: var(--spacing-sm);
}

.cta-description {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--spacing-lg);
}

.cta-button {
  display: inline-block;
  background-color: var(--color-accent);
  color: #FFFFFF;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 1.1rem;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
}

.cta-button:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  text-decoration: none;
}

/* Footer */
.footer {
  background-color: var(--color-bg-primary);
  padding: var(--spacing-lg) 0;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer p {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: 0;
}

/* Responsive Design */
@media screen and (max-width: 768px) {
  body {
    font-size: 16px;
  }

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

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

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.25rem;
  }

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

  article {
    padding: var(--spacing-lg);
  }

  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  h3 {
    font-size: 1.25rem;
  }

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

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

  .cta-title {
    font-size: 1.75rem;
  }

  .cta-description {
    font-size: 1rem;
  }

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

@media screen and (max-width: 480px) {
  .hero-title {
    font-size: 1.75rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  article {
    padding: var(--spacing-md);
  }

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

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

  .hero {
    background: white;
    border-bottom: 2px solid black;
    box-shadow: none;
  }

  .hero-title,
  .hero-subtitle,
  .hero-tagline {
    color: black;
  }

  article {
    background-color: white;
    box-shadow: none;
  }

  .cta {
    background: white;
    border-top: 2px solid black;
  }

  .cta-content {
    background-color: white;
    box-shadow: none;
  }

  .cta-button {
    background-color: black;
    color: white;
  }

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

  h2 {
    border-bottom-color: black;
  }
}