header {
  background: linear-gradient(135deg, #6f5c77 0%, #8b7a93 100%);
  border-bottom: none;
}

header .logo,
header .badge {
  color: white;
}

header .badge {
  background: rgba(255, 255, 255, 0.2);
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow);
}

.subtitle {
  color: var(--text-muted);
  margin-top: 0.5rem;
  margin-bottom: 1rem;
}

.hint-box {
  background: #f3f0f5;
  border: 1px solid #d6cedb;
  color: #57475f;
  border-radius: 10px;
  padding: 0.9rem 1rem;
  margin-bottom: 1rem;
}

.mdl-preview {
  background: #f7f5f8;
  border: 1px solid #e3dde7;
  border-radius: 12px;
  padding: 1rem;
  margin-bottom: 1rem;
}

.mdl-preview h3 {
  margin-bottom: 0.75rem;
  color: #57475f;
}

.preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0.5rem;
}

.preview-item {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.45rem 0.55rem;
  border-radius: 8px;
  background: white;
  border: 1px solid #ebe6ee;
  font-size: 0.9rem;
}

.preview-item span {
  color: #6f5c77;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.tx-code-section {
  background: #f5f3f7;
  border: 1px solid #ddd3e3;
  border-radius: 10px;
  padding: 0.9rem;
  margin-bottom: 1rem;
}

.tx-code-display {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.tx-code-value {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: white;
  border: 1px dashed #8b7a93;
  border-radius: 6px;
  padding: 0.35rem 0.6rem;
  letter-spacing: 0.08rem;
}

.hidden {
  display: none;
}

#successSection {
  text-align: center;
}