body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #23272a;
  color: #fff;
  margin: 0;
  padding: 0;
}
header {
  background: #5865f2;
  padding: 2rem 1rem 1.5rem 1rem;
  text-align: center;
}
header h1 {
  margin: 0 0 0.5rem 0;
  font-size: 2.5rem;
  letter-spacing: 1px;
}
header p {
  margin: 0 0 1.5rem 0;
  font-size: 1.2rem;
}
.add-btn {
  display: inline-block;
  background: #43b581;
  color: #fff;
  padding: 0.8rem 2rem;
  border-radius: 30px;
  font-size: 1.1rem;
  text-decoration: none;
  font-weight: bold;
  transition: background 0.2s;
}
.add-btn:hover {
  background: #2ecc71;
}
main {
  max-width: 700px;
  margin: 2rem auto;
  background: #2c2f33;
  border-radius: 12px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.2);
  padding: 2rem 1.5rem;
}
section {
  margin-bottom: 2rem;
}
h2 {
  color: #7289da;
  margin-top: 0;
}
ul, ol {
  margin: 0 0 0 1.5rem;
}
footer {
  text-align: center;
  color: #aaa;
  font-size: 0.95rem;
  margin: 2rem 0 1rem 0;
}
a {
  color: #43b581;
}
a:hover {
  color: #2ecc71;
}