* {
  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: #333;
  background-color: #fff;
}

header {
  background: #0066cc;
  color: white;
  padding: 20px 0;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

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

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

.logo {
  font-size: 24px;
  font-weight: bold;
  text-decoration: none;
  color: white;
}

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

nav a {
  color: white;
  text-decoration: none;
  font-size: 16px;
  transition: opacity 0.3s;
}

nav a:hover {
  opacity: 0.8;
}

main {
  padding: 40px 0;
}

h1 {
  font-size: 36px;
  margin-bottom: 20px;
  color: #0066cc;
}

h2 {
  font-size: 28px;
  margin-top: 30px;
  margin-bottom: 15px;
  color: #0066cc;
}

h3 {
  font-size: 22px;
  margin-top: 20px;
  margin-bottom: 10px;
  color: #0066cc;
}

p {
  margin-bottom: 15px;
  line-height: 1.8;
}

.intro-section {
  background: #f8f9fa;
  padding: 40px 0;
  margin-bottom: 40px;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin: 30px 0;
}

.feature-item {
  padding: 20px;
  background: #f8f9fa;
  border-radius: 8px;
  border-left: 4px solid #0066cc;
}

.feature-item h3 {
  margin-top: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

table th,
table td {
  padding: 12px;
  text-align: left;
  border-bottom: 1px solid #ddd;
}

table th {
  background: #f8f9fa;
  font-weight: 600;
  color: #0066cc;
}

table tr:hover {
  background: #f8f9fa;
}

footer {
  background: #333;
  color: white;
  padding: 30px 0;
  margin-top: 60px;
  text-align: center;
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  margin-bottom: 20px;
  text-align: left;
}

.footer-section h4 {
  margin-bottom: 15px;
  color: #0066cc;
}

.footer-section ul {
  list-style: none;
}

.footer-section a {
  color: #ccc;
  text-decoration: none;
  display: block;
  margin-bottom: 8px;
  transition: color 0.3s;
}

.footer-section a:hover {
  color: white;
}

.breadcrumb {
  margin-bottom: 20px;
  color: #666;
  font-size: 14px;
}

.breadcrumb a {
  color: #0066cc;
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

ul, ol {
  margin-left: 20px;
  margin-bottom: 15px;
}

li {
  margin-bottom: 8px;
}

a {
  color: #0066cc;
  text-decoration: none;
  transition: color 0.3s;
}

a:hover {
  color: #0052a3;
}

strong {
  font-weight: 600;
}

.related-articles {
  margin-top: 40px;
  padding: 30px;
  background: #f8f9fa;
  border-radius: 8px;
}

.related-articles h3 {
  margin-top: 0;
}

.related-list {
  list-style: none;
  margin: 0;
}

.related-list li {
  margin-bottom: 12px;
}

.related-list a {
  display: block;
  padding: 10px;
  background: white;
  border-radius: 4px;
  border-left: 3px solid #0066cc;
}

.related-list a:hover {
  background: #f0f5ff;
}