* {
  box-sizing: border-box;
}
body {
  font-family: 'Segoe UI', sans-serif;
  margin: 0;
  background-color: #121212;
  color: #ffffff;
}
nav {
  background-color: #1f1f1f;
  padding: 15px;
  display: flex;
  gap: 15px;
  justify-content: center;
  border-bottom: 1px solid #333;
}
nav a {
  color: #aaa;
  text-decoration: none;
  padding: 8px 14px;
  border-radius: 6px;
}
nav a.active, nav a:hover {
  background-color: #0077ff;
  color: white;
}
main {
  padding: 40px;
  text-align: center;
}
h1 {
  font-size: 2rem;
}
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px;
  margin-top: 30px;
}
.card {
  background-color: #1e1e1e;
  padding: 20px;
  border-radius: 10px;
  text-decoration: none;
  color: white;
  border: 1px solid #2e2e2e;
  transition: 0.2s;
  cursor: pointer;
}
.card:hover {
  border-color: #0077ff;
  background-color: #2a2a2a;
}
input[type="text"] {
  padding: 10px;
  width: 300px;
  border-radius: 6px;
  border: none;
  margin: 20px 10px;
}
button {
  padding: 10px 16px;
  background-color: #0077ff;
  color: white;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}
button:hover {
  background-color: #005fcc;
}