* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background-color: #050c23;
  color: #cfd8dc;
  font-size: 18px;
  font-family: "Courier New", monospace;
  line-height: 1.6;
}
header {
  padding: 2rem;
  text-align: center;
  background: #0a122f;
  border-bottom: 2px solid cyan;
}
header h1 {
  font-size: 3rem;
  color: cyan;
  margin-bottom: 1rem;
  text-shadow: 0 0 10px cyan, 0 0 20px #00e5ff;
}
header p {
  max-width: 800px;
  margin: 0.5rem auto;
  text-indent: 1em;
  color: #b0bec5;
}
h2 {
  color: cyan;
  margin-bottom: 1rem;
  border-bottom: 1px solid cyan;
  padding-bottom: 0.5rem;
}

h3 {
  color: #00e5ff;
  margin-bottom: 0.5rem;

}
main {
  max-width: 1100px;
  margin: 2rem auto;
  padding: 0 1rem;
}
.card-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2rem;
}
.card {
  background: #0d183a;
  border: 1px solid #00bcd4;
  border-radius: 8px;
  padding: 1rem;
  box-shadow: 0 0 10px rgba(0, 191, 255, 0.2);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 0 20px rgba(0, 191, 255, 0.4);
}
a {
  color: cyan;
  text-decoration: none;
  font-style: italic;
  transition: 0.3s;
}
a:hover {
  color: #d3d7cf;
  text-decoration: underline;
}
footer {
  text-align: center;
  padding: 1rem;
  background: #0a122f;
  border-top: 2px solid cyan;
  color: #90a4ae;
  font-size: 0.9rem;
  clear:both;
}
p {
  text-indent: 1em;
}
.img-right {
  float: right;
  margin: 0 0 1rem 1rem;
  max-width: 40%;
  border: 1px solid cyan;
  border-radius: 6px;
}
.img-left {
  float: left;
  margin: 0 1rem 1rem 0;
  max-width: 40%;
  border: 1px solid cyan;
  border-radius: 6px;
}
.img-center {
  display: block;
  margin: 1rem auto;
  max-width: 60%;
  border: 1px solid cyan;
  border-radius: 6px;
  clear: both;
}
.content-block {
  margin: 2rem 0;
  padding: 1rem;
  clear: both;
}
code{
  background-color: black;
  border: solid;
  border-color:black;
  border-radius: 5px;
  padding: 4px 6px;
}
pre{
  background-color: black;
  border: solid;
  border-color:black;
  border-radius: 5px;
  padding: 4px 6px;
  display:inline-block;
}
@media (max-width: 768px) {
  .img-right, 
  .img-left {
    float: none;
    display: block;
    margin: 1rem auto;
    max-width: 100%;
  }

  .content-block {
    text-align: center;
  }
}