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

/* CSS Custom Properties - Corporate Tech Theme */
:root {
  --primary-blue: #0066CC;
  --dark-blue: #003366;
  --light-blue: #E6F2FF;
  --text-dark: #1a1a1a;
  --text-medium: #4a4a4a;
  --text-light: #6a6a6a;
  --background-white: #ffffff;
  --background-gray: #f8f9fa;
  --border-gray: #e0e0e0;
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --max-width: 1000px;
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 2rem;
  --spacing-lg: 3rem;
  --spacing-xl: 4rem;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'SF Pro Display', 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--background-white);
  -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: linear-gradient(135deg, var(--dark-blue) 0%, var(--primary-blue) 100%);
  color: var(--background-white);
  padding: var(--spacing-xl) 0;
  text-align: center;
  box-shadow: var(--shadow-md);
}

.hero h1 {
  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;
  font-weight: 400;
  line-height: 1.5;
  max-width: 800px;
  margin: 0 auto;
  opacity: 0.95;
}

/* Main Content */
main {
  background-color: var(--background-white);
}

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

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

/* Typography Hierarchy */
h2 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--dark-blue);
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  line-height: 1.3;
  letter-spacing: -0.01em;
}

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

p {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-medium);
  margin-bottom: var(--spacing-md);
}

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

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

li {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-medium);
  margin-bottom: var(--spacing-sm);
}

ol li {
  padding-left: var(--spacing-xs);
}

/* Comparison Cards */
.comparison-card {
  background-color: var(--background-white);
  border: 2px solid var(--border-gray);
  border-radius: 8px;
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
}

.comparison-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.comparison-card.highlight {
  border-color: var(--primary-blue);
  background-color: var(--light-blue);
}

.comparison-card h3 {
  margin-top: 0;
  font-size: 1.375rem;
  color: var(--dark-blue);
}

.comparison-card p {
  margin-bottom: var(--spacing-sm);
  font-size: 1rem;
}

.comparison-card p:last-child {
  margin-bottom: 0;
}

/* Call-to-Action Section */
.cta-section {
  background: linear-gradient(to bottom, var(--background-white) 0%, var(--background-gray) 100%);
  padding: var(--spacing-xl) 0;
  border-top: 1px solid var(--border-gray);
}

.cta-content {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  align-items: center;
  background-color: var(--background-white);
  padding: var(--spacing-lg);
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-gray);
}

.cta-image {
  text-align: center;
}

.cta-image img {
  width: 200px;
  height: 200px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: var(--shadow-md);
  border: 4px solid var(--primary-blue);
}

.cta-text h2 {
  margin-top: 0;
  font-size: 2rem;
  color: var(--dark-blue);
  margin-bottom: var(--spacing-xs);
}

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

.cta-text p {
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--text-medium);
  margin-bottom: var(--spacing-md);
}

.cta-button {
  display: inline-block;
  background-color: var(--primary-blue);
  color: var(--background-white);
  font-size: 1.125rem;
  font-weight: 600;
  padding: 1rem 2.5rem;
  border-radius: 6px;
  text-decoration: none;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-sm);
  border: 2px solid var(--primary-blue);
  margin-top: var(--spacing-sm);
}

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

.cta-button:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

/* Footer */
.footer {
  background-color: var(--dark-blue);
  color: var(--background-white);
  padding: var(--spacing-lg) 0;
  text-align: center;
  border-top: 4px solid var(--primary-blue);
}

.footer p {
  margin-bottom: var(--spacing-sm);
  color: var(--background-white);
  opacity: 0.9;
  font-size: 0.9375rem;
}

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

.footer-links {
  margin-top: var(--spacing-sm);
}

.footer-links a {
  color: var(--background-white);
  text-decoration: none;
  font-weight: 500;
  transition: opacity 0.2s ease;
}

.footer-links a:hover {
  opacity: 0.8;
  text-decoration: underline;
}

/* Responsive Design - Tablet */
@media (min-width: 768px) {
  .hero h1 {
    font-size: 3rem;
  }

  .hero-subtitle {
    font-size: 1.375rem;
  }

  h2 {
    font-size: 2.25rem;
  }

  h3 {
    font-size: 1.625rem;
  }

  .cta-content {
    grid-template-columns: 200px 1fr;
    gap: var(--spacing-xl);
  }

  .cta-image {
    text-align: left;
  }
}

/* Responsive Design - Desktop */
@media (min-width: 1024px) {
  .hero {
    padding: 5rem 0;
  }

  .hero h1 {
    font-size: 3.5rem;
  }

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

  article {
    padding: 5rem 0;
  }

  .cta-section {
    padding: 5rem 0;
  }

  .comparison-card {
    padding: var(--spacing-lg);
  }
}

/* Print Styles */
@media print {
  .hero {
    background: var(--dark-blue);
    color: var(--text-dark);
    padding: var(--spacing-md) 0;
  }

  .hero h1 {
    color: var(--dark-blue);
  }

  .hero-subtitle {
    color: var(--text-medium);
  }

  .cta-section,
  .footer {
    display: none;
  }

  .comparison-card {
    page-break-inside: avoid;
    border: 1px solid var(--border-gray);
    box-shadow: none;
  }

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

  body {
    background-color: var(--background-white);
  }
}

/* Accessibility */
a:focus,
button:focus,
.cta-button:focus {
  outline: 3px solid var(--primary-blue);
  outline-offset: 2px;
}

/* Selection */
::selection {
  background-color: var(--primary-blue);
  color: var(--background-white);
}

::-moz-selection {
  background-color: var(--primary-blue);
  color: var(--background-white);
}