:root {
  --primary-color: #2563eb;
  --text-color: #1f2937;
  --light-bg: #f9fafb;
  --border-color: #e5e7eb;
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --radius: 8px;
  --transition: all 0.3s ease;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background: white;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
.site-header {
  background: white;
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
}

.site-header h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--primary-color);
  margin: 0;
}

.site-header nav {
  display: flex;
  gap: 24px;
}

.site-header nav a {
  text-decoration: none;
  color: var(--text-color);
  font-weight: 500;
  transition: var(--transition);
}

.site-header nav a:hover {
  color: var(--primary-color);
}

/* Main Content */
main {
  padding: 40px 20px;
  min-height: calc(100vh - 200px);
}

article {
  background: var(--light-bg);
  padding: 40px;
  border-radius: var(--radius);
  margin-bottom: 40px;
}

article h2 {
  font-size: 32px;
  margin-bottom: 8px;
  color: var(--text-color);
}

article p:first-of-type {
  color: #6b7280;
  font-size: 14px;
  margin-bottom: 32px;
}

article h3 {
  font-size: 20px;
  margin-top: 28px;
  margin-bottom: 12px;
  color: var(--text-color);
}

article p {
  margin-bottom: 16px;
  line-height: 1.8;
}

article ul {
  margin-left: 24px;
  margin-bottom: 16px;
}

article li {
  margin-bottom: 8px;
  line-height: 1.8;
}

article a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition);
}

article a:hover {
  text-decoration: underline;
}

article hr {
  border: none;
  border-top: 1px solid var(--border-color);
  margin: 32px 0;
}

/* Hero Section */
.hero {
  text-align: center;
  padding: 60px 20px;
  margin-bottom: 40px;
}

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 16px;
  background: linear-gradient(135deg, var(--primary-color), #1e40af);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 18px;
  color: #6b7280;
  max-width: 600px;
  margin: 0 auto 24px;
}

.cta-button {
  display: inline-block;
  padding: 12px 32px;
  background: var(--primary-color);
  color: white;
  text-decoration: none;
  border-radius: var(--radius);
  font-weight: 600;
  transition: var(--transition);
  border: 2px solid var(--primary-color);
}

.cta-button:hover {
  background: #1d4ed8;
  border-color: #1d4ed8;
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.cta-button.secondary {
  background: white;
  color: var(--primary-color);
}

.cta-button.secondary:hover {
  background: var(--light-bg);
}

/* Features Grid */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin: 40px 0;
}

.feature-card {
  background: white;
  padding: 24px;
  border-radius: var(--radius);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}

.feature-card:hover {
  border-color: var(--primary-color);
  box-shadow: 0 4px 12px rgba(37, 99, 235, 0.1);
}

.feature-card h3 {
  margin-top: 0;
  margin-bottom: 12px;
  color: var(--primary-color);
}

.feature-card p {
  margin: 0;
  font-size: 14px;
  color: #6b7280;
}

/* Highlight Box */
.highlight {
  background: #eff6ff;
  border-left: 4px solid var(--primary-color);
  padding: 16px 20px;
  border-radius: 4px;
  margin: 24px 0;
}

.highlight strong {
  color: var(--primary-color);
}

/* Footer */
.site-footer {
  background: var(--light-bg);
  border-top: 1px solid var(--border-color);
  padding: 24px 20px;
  text-align: center;
  margin-top: 60px;
}

.site-footer p {
  margin: 0;
  color: #6b7280;
  font-size: 14px;
}

.site-footer a {
  color: var(--primary-color);
  text-decoration: none;
  transition: var(--transition);
}

.site-footer a:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
  .site-header .container {
    flex-direction: column;
    gap: 16px;
  }

  .site-header nav {
    gap: 16px;
    font-size: 14px;
  }

  .hero h1 {
    font-size: 36px;
  }

  .hero p {
    font-size: 16px;
  }

  article {
    padding: 24px;
  }

  article h2 {
    font-size: 24px;
  }

  .features {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .site-header h1 {
    font-size: 22px;
  }

  .site-header nav {
    flex-direction: column;
    gap: 8px;
  }

  .hero h1 {
    font-size: 28px;
  }

  article {
    padding: 16px;
  }

  article h3 {
    font-size: 18px;
  }
}