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

body {
  font-family: system-ui, sans-serif;
  background: #0f0f0f;
  color: #e8e8e8;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  padding: 2rem 1rem;
}

.app {
  width: 100%;
  max-width: 700px;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: #fff;
}

h2 {
  font-size: 1rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #888;
  margin-bottom: 0.75rem;
}

.intro {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding: 1.25rem 1.5rem;
  background: #1a1a1a;
  border: 1px solid #2a2a2a;
  border-radius: 8px;
}

.intro-block h3 {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #7c6af7;
  margin-bottom: 0.4rem;
}

.intro-block p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: #aaa;
}

.intro-block em {
  font-style: italic;
  color: #c8c8c8;
}

.intro-block strong {
  font-weight: 600;
  color: #c8c8c8;
}

.input-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

textarea {
  width: 100%;
  background: #1a1a1a;
  color: #e8e8e8;
  border: 1px solid #333;
  border-radius: 8px;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  font-family: inherit;
  resize: vertical;
  outline: none;
  transition: border-color 0.15s;
}

textarea:focus {
  border-color: #555;
}

.options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.options-label {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: #888;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  cursor: pointer;
  font-size: 0.95rem;
}

.radio-label input[type="radio"] {
  accent-color: #7c6af7;
  width: 16px;
  height: 16px;
}

.hint {
  color: #666;
  font-size: 0.85rem;
}

button {
  align-self: flex-start;
  background: #7c6af7;
  color: #fff;
  border: none;
  border-radius: 8px;
  padding: 0.6rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s;
}

button:hover {
  background: #6a58e0;
}

.result-lines {
  background: #1a1a1a;
  border: 1px solid #333;
  border-radius: 8px;
  padding: 1rem;
  display: flex;
  flex-direction: column;
}

.line {
  font-family: 'Courier New', monospace;
  font-size: 1rem;
  line-height: 1.6;
  white-space: pre;
  display: inline-block;
}