/* CSS Variables for consistent styling */
:root {
  --paper: #ffffff;
  --ink: #333333;
  --link-color: #0066cc;
  --border-color: #dddddd;
  --bg-light: #f5f5f5;
  --font: 100%/1.5 system-ui, sans-serif;
  --space: 20px;
  --space-large: 40px;
  --line: 1px solid var(--border-color);
  --container: 1100px;
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

body {
  background-color: var(--paper);
  color: var(--ink);
  font: var(--font);
  margin: 0;
  padding: var(--space);
}

/* Header and Navigation */
header {
  border-bottom: var(--line);
  padding-bottom: var(--space);
  margin-bottom: var(--space-large);
  text-align: center;
}

header h1 {
  margin: 0 0 var(--space) 0;
}

nav ul {
  display: flex;
  justify-content: center;
  list-style: none;
  gap: 30px;
  padding: 0;
  margin: 0;
}

nav li {
  cursor: pointer;
  transition: color 0.3s ease;
}

nav li:hover {
  color: var(--link-color);
}

/* Main grid layout with 3 repeating components */
main {
  max-width: var(--container);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space);
}

/* Article components */
article {
  border: var(--line);
  padding: var(--space);
  border-radius: var(--radius);
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.3s ease;
}

article:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

article img {
  width: 100%;
  height: 150px;
  background-color: var(--bg-light);
  margin-bottom: 15px;
  border-radius: var(--radius);
  object-fit: cover;
}

article h2 {
  margin: 0 0 10px 0;
  font-size: 1.25rem;
}

article p {
  margin: 0 0 15px 0;
  flex-grow: 1;
}

article a {
  color: var(--link-color);
  text-decoration: none;
  font-weight: 500;
  align-self: flex-start;
}

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

/* Footer */
footer {
  margin-top: 50px;
  border-top: var(--line);
  padding-top: var(--space);
  text-align: center;
  font-size: 0.9rem;
}

/* Responsive design for smaller screens */
@media (max-width: 768px) {
  main {
    grid-template-columns: 1fr;
  }
  
  body {
    padding: 15px;
  }
  
  nav ul {
    gap: 15px;
  }
}