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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  background: #f5f5f5;
  color: #333;
  padding: 16px;
}

.container {
  max-width: 680px;
  margin: 0 auto;
  background: white;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.1);
}

h2 {
  font-size: 1.4rem;
  margin-bottom: 20px;
  color: #1a1a2e;
}

.field-row {
  display: flex;
  gap: 12px;
  margin-bottom: 14px;
}

.field-row .field {
  flex: 1;
}

.field {
  margin-bottom: 14px;
}

label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 5px;
  color: #555;
}

input[type="text"],
textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid #ddd;
  border-radius: 8px;
  font-size: 0.95rem;
  font-family: inherit;
  transition: border-color 0.2s;
  background: #fafafa;
}

input[type="text"]:focus,
textarea:focus {
  outline: none;
  border-color: #4a90d9;
  background: white;
}

textarea {
  height: 130px;
  resize: vertical;
}

textarea#output {
  height: 200px;
  background: #f8fdf8;
  border-color: #c3e6cb;
  color: #1a3a1a;
}

button {
  width: 100%;
  padding: 13px;
  margin: 6px 0 16px;
  background: #3a7bd5;
  color: white;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s;
}

button:hover {
  background: #2f66b8;
}

button:active {
  background: #2558a0;
}

@media (max-width: 480px) {
  .container {
    padding: 16px;
    border-radius: 8px;
  }

  .field-row {
    flex-direction: column;
    gap: 0;
  }

  h2 {
    font-size: 1.2rem;
  }
}