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

:root {
  /* Dark Mode Color Palette */
  --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-dark: #3730A3;
  --color-border: #2A2A2A;
  --color-shadow: rgba(0, 0, 0, 0.5);

  /* Typography */
  --font-primary: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', 'Roboto', 'Inter', system-ui, sans-serif;
  --font-mono: 'SF Mono', 'Monaco', 'Cascadia Code', 'Roboto Mono', monospace;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 4rem;
  --spacing-3xl: 6rem;

  /* Layout */
  --container-max-width: 900px;
  --content-max-width: 720px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
}

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

body {
  font-family: var(--font-primary);
  font-size: 1.0625rem;
  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-md);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-xl);
  }
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  padding: var(--spacing-3xl) 0 var(--spacing-2xl);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 0%, rgba(99, 102, 241, 0.15) 0%, transparent 70%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero-title {
  font-size: 2.25rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--spacing-md);
  color: #FFFFFF;
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: 3rem;
  }
}

@media (min-width: 1024px) {
  .hero-title {
    font-size: 3.5rem;
  }
}

.hero-subtitle {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  max-width: 700px;
  margin: 0 auto;
  font-weight: 400;
}

@media (min-width: 768px) {
  .hero-subtitle {
    font-size: 1.25rem;
  }
}

/* Article Content */
.article-content {
  padding: var(--spacing-3xl) 0;
}

.article-content .container {
  max-width: var(--content-max-width);
}

article {
  background-color: var(--color-bg-elevated);
  padding: var(--spacing-xl);
  border-radius: 12px;
  box-shadow: 0 4px 20px var(--color-shadow);
}

@media (min-width: 768px) {
  article {
    padding: var(--spacing-2xl) var(--spacing-3xl);
  }
}

/* Typography */
.lead {
  font-size: 1.25rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xl);
  font-weight: 400;
}

h2 {
  font-size: 1.875rem;
  font-weight: 700;
  line-height: 1.3;
  color: #FFFFFF;
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-md);
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.4;
  color: #FFFFFF;
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-sm);
}

h4 {
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1.4;
  color: var(--color-text-primary);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

h5, h6 {
  font-size: 1.0625rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--color-text-primary);
  margin-top: var(--spacing-md);
  margin-bottom: var(--spacing-xs);
}

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

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

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

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

ul li::marker {
  color: var(--color-accent);
}

ol li::marker {
  color: var(--color-accent);
  font-weight: 600;
}

/* Code */
code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background-color: var(--color-bg-primary);
  color: var(--color-accent);
  padding: 0.125rem 0.375rem;
  border-radius: 4px;
  border: 1px solid var(--color-border);
}

pre {
  background-color: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: var(--spacing-md);
  overflow-x: auto;
  margin-bottom: var(--spacing-md);
}

pre code {
  background-color: transparent;
  border: none;
  padding: 0;
  color: var(--color-text-primary);
}

/* 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);
}

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-md);
  overflow-x: auto;
  display: block;
}

@media (min-width: 768px) {
  table {
    display: table;
  }
}

thead {
  background-color: var(--color-bg-primary);
}

th {
  padding: var(--spacing-sm);
  text-align: left;
  font-weight: 600;
  color: #FFFFFF;
  border-bottom: 2px solid var(--color-border);
}

td {
  padding: var(--spacing-sm);
  border-bottom: 1px solid var(--color-border);
  color: var(--color-text-primary);
}

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

/* Images */
img {
  max-width: 100%;
  height: auto;
  display: block;
  margin: var(--spacing-lg) 0;
  border-radius: 8px;
}

/* Links */
a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Call to Action Section */
.cta {
  background: linear-gradient(135deg, #16213e 0%, #0f172a 100%);
  padding: var(--spacing-3xl) 0;
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 70%);
  pointer-events: none;
}

.cta .container {
  position: relative;
  z-index: 1;
}

.cta-content {
  background-color: var(--color-bg-elevated);
  border-radius: 16px;
  padding: var(--spacing-xl);
  box-shadow: 0 8px 32px var(--color-shadow);
  text-align: center;
}

@media (min-width: 768px) {
  .cta-content {
    padding: var(--spacing-2xl) var(--spacing-3xl);
  }
}

.cta-profile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-xl);
}

@media (min-width: 768px) {
  .cta-profile {
    flex-direction: row;
    text-align: left;
    gap: var(--spacing-xl);
  }
}

.cta-photo {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-accent);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.3);
  flex-shrink: 0;
}

@media (min-width: 768px) {
  .cta-photo {
    width: 140px;
    height: 140px;
  }
}

.cta-text {
  flex: 1;
}

.cta-title {
  font-size: 2rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: var(--spacing-sm);
  letter-spacing: -0.01em;
}

@media (min-width: 768px) {
  .cta-title {
    font-size: 2.25rem;
  }
}

.cta-description {
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin: 0;
}

.cta-button {
  display: inline-block;
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-dark) 100%);
  color: #FFFFFF;
  font-size: 1.125rem;
  font-weight: 600;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: 8px;
  text-decoration: none;
  transition: all var(--transition-base);
  box-shadow: 0 4px 16px rgba(99, 102, 241, 0.4);
  border: none;
  cursor: pointer;
}

.cta-button:hover {
  background: linear-gradient(135deg, var(--color-accent-hover) 0%, var(--color-accent) 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(99, 102, 241, 0.5);
  text-decoration: none;
}

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

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

.footer p {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin: 0;
}

/* Print Styles */
@media print {
  body {
    background-color: #FFFFFF;
    color: #000000;
  }

  .hero {
    background: #FFFFFF;
    color: #000000;
  }

  article {
    background-color: #FFFFFF;
    box-shadow: none;
  }

  .cta, .footer {
    display: none;
  }

  a {
    color: #000000;
    text-decoration: underline;
  }

  h2, h3, h4, h5, h6 {
    color: #000000;
  }
}