/* General Styles */
body {
  font-family: Georgia, serif;
  margin: 0;
  padding: 0;
  line-height: 1.6;
  background-color: #f8f8f8;
  color: #333;
}

header {
  background-color: #2c3e50;
  color: #fff;
  padding: 2rem;
  text-align: center;
}

header h1 {
  margin: 0;
  font-size: 2rem;
}

main {
  max-width: 800px;
  margin: 2rem auto;
  padding: 0 1rem;
}

h2 {
  color: #2c3e50;
  margin-top: 2rem;
  border-bottom: 2px solid #ddd;
  padding-bottom: 0.5rem;
}

h3 {
  margin-top: 1rem;
  color: #34495e;
}

p {
  margin: 1rem 0;
}

/* Card Styles */
.card {
  background: #fff;
  border-radius: 8px;
  padding: 1rem;
  margin: 1rem 0;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

/* Timeline Styles */
.timeline {
  list-style: none;
  padding: 0;
  margin: 1rem 0;
  border-left: 3px solid #ccc;
}

.timeline li {
  margin: 1rem 0;
  padding-left: 1rem;
  position: relative;
}

.timeline li::before {
  content: "";
  position: absolute;
  left: -9px;
  top: 0.4rem;
  width: 12px;
  height: 12px;
  background: #2c3e50;
  border-radius: 50%;
}

.year {
  font-weight: bold;
  color: #2c3e50;
}

/* Tag Styles */
.tag {
  display: inline-block;
  padding: 0.3rem 0.6rem;
  margin: 0.2rem;
  border-radius: 12px;
  font-size: 0.9rem;
  color: #fff;
}

.tag-history { background-color: #8e44ad; }
.tag-science { background-color: #27ae60; }
.tag-invention { background-color: #e67e22; }

/* Footer */
footer {
  background-color: #2c3e50;
  color: #fff;
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
}