.opf-wrap {
  max-width: 860px;
  margin: 24px auto;
  padding: 0 16px;
}

.opf-card {
  border: 1px solid #e5e7eb;
  border-radius: 14px;
  padding: 20px;
  background: #ffffff;
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.05);
}

.opf-card h3 {
  margin-top: 0;
  margin-bottom: 10px;
}

.opf-card label {
  display: block;
  margin: 14px 0 8px;
  font-weight: 600;
}

#opf-input {
  width: 100%;
  min-height: 170px;
  border: 1px solid #d1d5db;
  border-radius: 10px;
  padding: 12px;
  font-size: 15px;
  resize: vertical;
  box-sizing: border-box;
}

.opf-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 14px;
  flex-wrap: wrap;
}

#opf-format-btn,
.opf-secondary-btn {
  border: none;
  padding: 10px 16px;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
}

#opf-format-btn {
  background: #111827;
  color: #ffffff;
}

.opf-secondary-btn {
  background: #e5e7eb;
  color: #111827;
}

#opf-format-btn:disabled,
.opf-secondary-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

#opf-status {
  font-size: 14px;
  color: #6b7280;
}

.opf-output {
  margin-top: 8px;
  min-height: 180px;
  border: 1px solid #d1d5db;
  border-radius: 10px;
  padding: 12px;
  background: #f9fafb;
  white-space: pre-wrap;
  line-height: 1.7;
}