body {
  margin: 0;
  background-color: #0a0a0a;
  font-family: 'Press Start 2P', monospace;
  color: #f44;
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 240px;
  background-color: #111;
  padding: 20px;
  border-right: 2px solid #900;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  overflow-y: auto;
}

.sidebar h2 {
  color: #f00;
  text-align: center;
  margin-bottom: 20px;
  font-size: 14px;
}

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

.sidebar li {
  margin: 10px 0;
}

.sidebar a {
  color: #f88;
  text-decoration: none;
  display: block;
  transition: background 0.3s;
}

.sidebar a:hover {
  background: #300;
  color: #fff;
}

.main-content {
  margin-left: 260px;
  padding: 20px;
  flex-grow: 1;
}

.banner {
  width: 100%;
  max-width: 1000px;
  display: block;
  margin-bottom: 20px;
}