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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  line-height: 1.4;
  color: #333;
  background-color: #f5f5f5;
  padding: 20px;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  background-color: #fff;
  padding: 40px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
}

h1 {
  font-size: 2.5em;
  color: #2c3e50;
  margin-bottom: 10px;
  border-bottom: 3px solid #3498db;
  padding-bottom: 15px;
}

.h5 {  /* subtitle */
  color: #7f8c8d;
  font-size: 0.9em;
  margin-bottom: 30px;
  font-style: italic;
}

h2 {
  font-size: 1.8em;
  color: #34495e;
  margin-top: 35px;
  margin-bottom: 15px;
  padding-bottom: 8px;
  border-bottom: 2px solid #ecf0f1;
}

h3 {
  font-size: 1.4em;
  color: #33577a;
  margin-top: 35px;
  margin-bottom: 2px;
  padding-bottom: 2px;
}

p {
  margin-bottom: 15px;
  text-align: justify;
}

ul {
  margin-left: 30px;
  margin-bottom: 15px;
}

li {
  margin-bottom: 8px;
}

strong {
  color: #2c3e50;
}

a {
  color: #3498db;
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

@media (max-width: 768px) {
  .container {
      padding: 20px;
  }
  h1 {
      font-size: 2em;
  }
  h2 {
      font-size: 1.5em;
  }
}