body {
  background: #181a1b;
  color: #f1f1f1;
  font-family: "Segoe UI", Arial, sans-serif;
  margin: 0;
  min-height: 100vh;
}
nav {
  background: #23272a;
  padding: 1em 0;
  text-align: center;
}
nav a {
  color: #b9bbbe;
  text-decoration: none;
  margin: 0 1.5em;
  font-weight: bold;
  padding: 0.5em 1em;
  border-radius: 5px;
  transition: background 0.2s, color 0.2s;
}
nav a.active,
nav a:hover {
  background: #7289da;
  color: #fff;
}
main {
  max-width: 500px;
  margin: 2em auto;
  background: #222426;
  padding: 2em;
  border-radius: 10px;
  box-shadow: 0 2px 8px #000a;
}
h1,
h2 {
  color: #fff;
}
textarea {
  width: 100%;
  min-height: 80px;
  background: #181a1b;
  color: #f1f1f1;
  border: 1px solid #444;
  border-radius: 5px;
  margin-bottom: 1em;
  padding: 0.8em;
  font-size: 1em;
  resize: vertical;
}
button {
  background: #7289da;
  color: #fff;
  border: none;
  padding: 0.7em 2em;
  border-radius: 5px;
  font-size: 1em;
  cursor: pointer;
  margin-bottom: 1em;
  transition: background 0.2s;
}
button:hover {
  background: #5b6eae;
}