body {
  background-color: #000;
  color: #fff;
  font-family: serif;
  margin: 0;
  padding: 0;
}
section {
  padding: 40px 20px;
  text-align: center;
}
.hero {
  background: linear-gradient(to bottom, #111, #000);
}
.hero h1 {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}
.hero p {
  font-size: 1.2rem;
  margin-bottom: 1rem;
}
.buttons a {
  margin: 0 10px;
  padding: 10px 20px;
  color: #000;
  background: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: bold;
}
.mission, .books, .coin, .signup {
  background-color: #111;
}
.book-list {
  display: flex;
  justify-content: center;
  gap: 20px;
}
.book {
  background: #222;
  padding: 20px;
  border-radius: 10px;
}
.signup input {
  padding: 10px;
  margin-right: 10px;
}
.signup button {
  padding: 10px 20px;
  background: #fff;
  color: #000;
  font-weight: bold;
  border-radius: 8px;
}
footer {
  font-size: 0.9rem;
  background: #000;
  padding: 20px;
}