* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: Arial, sans-serif;
  background: #f9fafb;
  color: #333;
  line-height: 1.6;
}

header {
  text-align: center;
  padding: 2rem 1rem;
  background: #0f172a;
  color: #fff;
}

.container {
  max-width: 800px;
  margin: 2rem auto;
  padding: 1rem;
}

form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

textarea {
  padding: 0.7rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  resize: vertical;
}

.btn {
  background: #0f172a;
  color: #fff;
  border: none;
  padding: 0.8rem;
  border-radius: 6px;
  cursor: pointer;
  transition: background 0.3s;
}

.btn:hover {
  background: #1e293b;
}

#output-section {
  margin-top: 2rem;
  padding: 1rem;
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 6px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

#output-box {
  margin-top: 0.5rem;
  padding: 1rem;
  background: #f1f5f9;
  border-radius: 6px;
  min-height: 80px;
}

footer {
  text-align: center;
  padding: 1rem;
  margin-top: 2rem;
  background: #0f172a;
  color: #fff;
}