:root {
  --primary-color: #0066cc;
  --text-color: #333;
  --bg-color: #f5f5f5;
  --card-bg: #ffffff;
  --border-color: #ddd;
  --header-bg: #ffffff;
  --footer-bg: #333;
  --footer-text: #ffffff;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--bg-color);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header {
  background: var(--header-bg);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  margin-bottom: 40px;
}

header nav {
  padding: 20px 0;
}

header nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  font-size: 24px;
}

header h1 a {
  color: var(--primary-color);
  text-decoration: none;
}

header ul {
  display: flex;
  list-style: none;
  gap: 30px;
}

header a {
  color: var(--text-color);
  text-decoration: none;
}

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

/* Main Content */
main {
  min-height: calc(100vh - 250px);
  padding-bottom: 40px;
}

.hero {
  background: linear-gradient(135deg, var(--primary-color) 0%, #0052a3 100%);
  color: white;
  padding: 60px 20px;
  border-radius: 8px;
  margin-bottom: 40px;
  text-align: center;
}

.hero h1 {
  font-size: 48px;
  margin-bottom: 20px;
}

.hero p {
  font-size: 20px;
  max-width: 800px;
  margin: 0 auto;
}

.content-section {
  margin-bottom: 60px;
}

.content-section h2 {
  font-size: 32px;
  margin-bottom: 30px;
  color: var(--text-color);
}

/* Cards */
.card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 30px;
  margin-bottom: 20px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  transition: box-shadow 0.3s ease;
}

.card:hover {
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

.card h2, .card h3 {
  color: var(--primary-color);
  margin-bottom: 15px;
}

.meta {
  color: #666;
  font-size: 14px;
  margin-bottom: 15px;
}

.summary {
  font-style: italic;
  color: #555;
  margin-bottom: 15px;
}

.content {
  margin-top: 15px;
  line-height: 1.8;
}

/* Grids */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
  margin-bottom: 30px;
}

.page-grid {
  display: grid;
  gap: 30px;
}

.page-list {
  list-style: none;
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 30px;
}

.page-list li {
  padding: 15px 0;
  border-bottom: 1px solid var(--border-color);
}

.page-list li:last-child {
  border-bottom: none;
}

/* Buttons and Links */
.btn, .read-more {
  display: inline-block;
  padding: 12px 24px;
  background: var(--primary-color);
  color: white;
  text-decoration: none;
  border-radius: 4px;
  transition: background 0.3s ease;
}

.btn:hover, .read-more:hover {
  background: #0052a3;
}

.read-more {
  padding: 8px 16px;
  font-size: 14px;
}

/* Footer */
footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 30px 0;
  margin-top: 60px;
  text-align: center;
}

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

footer a:hover {
  color: #ccc;
}

/* Responsive */
@media (max-width: 768px) {
  header nav .container {
    flex-direction: column;
    gap: 20px;
  }

  header ul {
    gap: 15px;
  }

  .hero h1 {
    font-size: 32px;
  }

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

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