body {
  font-family: "Segoe UI", sans-serif;
  margin: 0;
  padding: 16px;
  background: #f5f7fa;
}
    h1 { text-align: center; color: #2980b9; font-size: 1.8em; margin-bottom: 0.2em; }
    .description { text-align: center; color: #7f8c8d; margin-bottom: 1.5em; line-height: 1.5; font-size: 0.95em; }
    .restrictions { text-align: left; 
        color: #c0392b; font-size: 0.85em; margin-top: 1em; padding: 0.8em; background: #fbe6e6; border-radius: 8px; border: 1px dashed #e74c3c; line-height: 1.6;
    }

.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center; /* 中央揃え */
  gap: 12px;
  margin: 20px auto;
  max-width: 800px;
}

.controls label {
  display: block;
  font-size: 14px;
  margin-bottom: 4px;
  color: #333;
}

.controls select,
.controls input,
.controls button {
  font-size: 16px;
  padding: 6px 10px;
  border: 1px solid #ccc;
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.controls button {
  background: #1976d2;
  color: #fff;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
}

.controls button:hover {
  background: #1565c0;
}

#svgHost {
  border: 1px solid #ccc;
  padding: 12px;
  background: #fff;
  overflow-x: auto;
}

textarea {
  font-family: inherit;
}
.control-group {
  display: flex;
  flex-direction: column;
  align-items: center;
}
button {
  padding: 8px 16px;
  font-size: 14px;
  cursor: pointer;
}