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

/* Body & container */
body {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  background: #f4f5f7;
  color: #1f2937;
}

.site-header, .site-footer {
  background-color: #1f2937;
  color: white;
  text-align: center;
  padding: 30px 20px;
}

.site-header h1 {
  font-size: 2.5rem;
  margin-bottom: 10px;
}

.site-main {
  max-width: 700px;
  margin: 40px auto;
  padding: 30px;
  background: white;
  border-radius: 12px;
  box-shadow: 0 8px 16px rgba(0,0,0,0.1);
}

/* Textarea */
textarea {
  width: 100%;
  height: 150px;
  padding: 15px;
  font-size: 1rem;
  border-radius: 8px;
  border: 1px solid #d1d5db;
  margin-bottom: 15px;
  resize: vertical;
}

/* Button */
button {
  padding: 12px 24px;
  background: #2563eb;
  color: white;
  font-size: 1rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
}

button:hover {
  background: #1e40af;
}

/* Output section */
#result {
  margin-top: 25px;
  padding: 15px;
  background: #eef2ff;
  border-radius: 8px;
  min-height: 60px;
}

/* Footer */
.site-footer p {
  font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 600px) {
  .site-main {
    padding: 20px;
  }
  textarea {
    height: 120px;
  }
}