body {
  font-family: Arial, sans-serif;
  margin: 0;
  padding: 0;
  max-width: 800px;
  margin: auto;
}

header {
  background: #24292f;
  color: white;
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

main {
  padding: 1rem;
}

.hidden {
  display: none;
}

label {
  display: block;
  margin-top: 0.5rem;
  font-weight: bold;
}

input, textarea, select, button {
  width: 100%;
  margin-top: 0.3rem;
  padding: 0.5rem;
}

button {
  background: #2da44e;
  color: white;
  border: none;
  border-radius: 4px;
  margin-top: 1rem;
  cursor: pointer;
}

button:hover {
  background: #238636;
}

ul {
  list-style: none;
  padding: 0;
}

ul li {
  padding: 0.5rem;
  border-bottom: 1px solid #ddd;
  cursor: pointer;
}