body {
  font-family: Arial, sans-serif;
  background-color: #f8f9fa;
  color: #333333;
  max-width: 800px;
  margin: 40px auto;
  padding: 0 20px;
  line-height: 1.6;
}

header h1 {
  color: #111827;
  text-align: center;
  margin-top: 0;
}

nav {
  text-align: center;
  margin-bottom: 40px;
  margin-top: 20px;
}

nav ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
}

nav li {
  display: inline-block;
}

nav a {
  background-color: #e2e8f0;
  color: #1e293b;
  text-decoration: none;
  padding: 8px 18px;
  border-radius: 8px;
  margin: 5px;
  display: inline-block;
  font-weight: bold;
  transition: 0.2s;
}

nav a:hover, nav a.active {
  background-color: #3b82f6;
  color: #ffffff;
}

a {
  color: #3b82f6;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

h2 {
  color: #1e293b;
  border-bottom: 2px solid #e2e8f0;
  padding-bottom: 8px;
  margin-top: 40px;
}

h3 {
  color: #334155;
  margin-top: 30px;
}

img {
  max-width: 100%;
  border-radius: 8px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  margin-bottom: 15px;
}

table {
  width: 100%;
  border-collapse: collapse;
  background-color: #ffffff;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 2px 4px rgba(0,0,0,0.05);
  margin-top: 20px;
}

th, td {
  padding: 12px 16px;
  border-bottom: 1px solid #f1f5f9;
  text-align: left;
}

th {
  background-color: #f8fafc;
  color: #475569;
}

.stred {
  text-align: center;
}

section p, section ul {
  margin-bottom: 20px;
}

section ul {
  padding-left: 25px;
}

footer {
  text-align: center;
  color: #94a3b8;
  font-size: 14px;
  margin-top: 60px;
  border-top: 1px solid #e2e8f0;
  padding-top: 20px;
}