body {
  font-family: sans-serif;
  padding: 2rem;
  background: #f9fafb;
}

.container {
  max-width: 720px;
  margin: auto;
  background: white;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: 0 0 20px #ccc;
}

.title-box {
  text-align: center;
}

.login-info {
  background: #e0f2fe;
  border: 1px solid #90cdf4;
  padding: 1rem;
  border-radius: 12px;
  margin-bottom: 1rem;
  font-size: 1rem;
  text-align: center;
}

.login-btn,
.logout-btn,
button {
  background: #2563eb;
  color: white;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  margin-top: 1rem;
}

.logout-btn {
  background: #ef4444;
}

.user-info {
  display: none;
  justify-content: space-between;
  align-items: center;
  margin: 1rem 0;
  padding: 1rem;
  border: 1px solid #ccc;
  border-radius: 12px;
  background: #f0fdf4;
}

textarea {
  width: 100%;
  padding: 1rem;
  margin-top: 1rem;
  border-radius: 12px;
  border: 1px solid #ddd;
  resize: vertical;
}

.output {
  margin-top: 2rem;
  background: #f3f4f6;
  padding: 1rem;
  border-radius: 12px;
}

.highlight {
  background: #fde68a;
  padding: 0 4px;
  border-radius: 4px;
  border-bottom: 2px dotted #f59e0b;
}