.blockchain-demo2-wrap {
  max-width: 860px;
  margin: 40px auto;
  padding: 0 16px;
}

.blockchain-demo2-card {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
}

.blockchain-demo2-title {
  margin: 0 0 8px;
  font-size: 28px;
  font-weight: 700;
  color:#111827;
}

.blockchain-demo2-desc {
  margin: 0 0 24px;
  color: #6b7280;
  line-height: 1.6;
}

.blockchain-demo2-section {
  margin-top: 22px;
  padding: 20px;
  border: 1px solid #e5e7eb;
  border-radius: 18px;
  background: #f9fafb;
}

.blockchain-demo2-section-title {
  margin: 0 0 16px;
  font-size: 18px;
  font-weight: 700;
}

.blockchain-demo2-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.blockchain-demo2-field {
  margin-bottom: 16px;
}

.blockchain-demo2-field label {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
}

.blockchain-demo2-field input,
.blockchain-demo2-field textarea,
.blockchain-demo2-field select {
  width: 100%;
  box-sizing: border-box;
  padding: 14px 16px;
  border: 1px solid #d1d5db;
  border-radius: 14px;
  font-size: 15px;
  background: #fff;
}

.blockchain-demo2-field textarea {
  min-height: 120px;
  resize: vertical;
}

.blockchain-demo2-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  border-radius: 14px;
  padding: 12px 18px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  background: #111827;
  color: #fff;
  margin-top: 20px;
}

.blockchain-demo2-btn:disabled {
  opacity: 0.7;
  cursor: wait;
}

.blockchain-demo2-result {
  margin-top: 18px;
  padding: 16px;
  border-radius: 16px;
  background: #f9fafb;
  min-height: 60px;
  line-height: 1.65;
  word-break: break-word;
}

.bd2-success {
  color: #047857;
  font-weight: 700;
  margin-bottom: 8px;
}

.bd2-error {
  color: #b91c1c;
  font-weight: 700;
  margin-bottom: 8px;
}

.bd2-warn {
  color: #b45309;
  font-weight: 700;
  margin-bottom: 8px;
}

.bd2-meta {
  margin-bottom: 6px;
}

.bd2-link-wrap {
  margin: 14px 0 10px;
}

.bd2-link {
  display: inline-block;
  text-decoration: none;
  font-weight: 700;
}

.bd2-details {
  margin-top: 10px;
}

.bd2-pre {
  margin-top: 10px;
  white-space: pre-wrap;
  word-break: break-word;
  background: #111827;
  color: #f9fafb;
  padding: 12px;
  border-radius: 12px;
  font-size: 13px;
}

@media (max-width: 640px) {
  .blockchain-demo2-grid {
    grid-template-columns: 1fr;
  }
}