body {
  background: linear-gradient(to right, #000000, #800000, #FFD700); /* black ➝ maroon ➝ gold */
  color: #eee;
  font-family: monospace;
  padding: 20px;
  margin: 0;
  overflow: hidden;
}

.container {
  width: 90%;
  max-width: 1000px;
  height: 90vh;
  margin: 5vh auto;
  background-color: #111;
  padding: 20px;
  border-radius: 12px;
  box-shadow: 0 0 30px rgba(255, 255, 255, 0.1);
  overflow-y: auto;
  border-left: 6px solid limegreen;
}

h1 {
  text-align: center;
  color: #FFD700;
  margin-bottom: 10px;
}

p {
  text-align: center;
  color: #ccc;
  margin-bottom: 20px;
}

.config label {
  display: block;
  margin: 15px 0 5px;
}

input, select {
  width: 100%;
  padding: 7px;
  margin-bottom: 10px;
  background-color: #222;
  color: #fff;
  border: 1px solid #444;
  border-radius: 4px;
}

button {
  background: crimson;
  color: white;
  padding: 10px 20px;
  border: none;
  cursor: pointer;
  border-radius: 6px;
  font-weight: bold;
  display: block;
  margin-top: 10px;
}

button:hover {
  box-shadow: 0 0 10px #ff0000;
}

.payload-block {
  background: #1a1a1a;
  border-left: 4px solid limegreen;
  padding: 10px;
  margin: 15px 0;
  border-radius: 6px;
  position: relative;
}

.payload-block h3 {
  margin-top: 0;
  color: #FFD700;
}

pre {
  white-space: pre-wrap;
  word-break: break-word;
  background-color: #000;
  color: #0f0;
  padding: 10px;
  border-radius: 6px;
  overflow-x: auto;
  font-size: 14px;
}

#listenerHelper h2 {
  color: #00ffff;
  border-bottom: 1px solid #555;
  padding-bottom: 5px;
}