:root {
  --primary-color: #ED225D; /* p5.jsのブランドカラー */
  --secondary-color: #2D7BB6;
  --light-color: #f5f5f5;
  --dark-color: #333333;
  --border-color: #dddddd;
  --success-color: #4CAF50;
}

body {
  font-family: 'Helvetica Neue', Arial, sans-serif;
  margin: 0;
  padding: 0;
  background-color: var(--light-color);
  color: var(--dark-color);
  line-height: 1.6;
}

.container {
  max-width: 100%;
  margin: 0 auto;
  padding: 20px;
}

header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--primary-color);
}

h1 {
  margin: 0;
  color: var(--primary-color);
  font-weight: 600;
}

.status-bar {
  background-color: white;
  padding: 10px 15px;
  border-radius: 4px;
  margin-bottom: 15px;
  border-left: 4px solid var(--secondary-color);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  min-height: 2em;
}

.editor-section {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

textarea {
  width: 100%;
  height: 200px;
  font-family: 'Menlo', 'Monaco', 'Courier New', monospace;
  font-size: 14px;
  padding: 15px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  resize: vertical;
  background-color: white;
  tab-size: 2;
}

.action-bar {
  display: flex;
  gap: 10px;
  align-items: center;
}

button {
  background-color: var(--primary-color);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: 4px;
  font-size: 16px;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
}

button:hover {
  background-color: #D41C54;
}

button:active {
  transform: scale(0.98);
}

.preview-section {
  display: flex;
  gap: 20px;
  margin-bottom: 20px;
}

.preview-panel {
  flex: 1;
  background-color: white;
  border-radius: 6px;
  overflow: hidden;
  box-shadow: 0 3px 6px rgba(0,0,0,0.1);
}

.preview-header {
  background-color: var(--dark-color);
  color: white;
  padding: 10px 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.preview-title {
  margin: 0;
  font-size: 16px;
  font-weight: 500;
}

.version-tag {
  background-color: var(--primary-color);
  color: white;
  padding: 3px 8px;
  border-radius: 12px;
  font-size: 12px;
  font-weight: bold;
}

iframe {
  border: none;
  background-color: white;
}

.sample-section {
  margin-top: 20px;
}

.sample-header {
  margin-bottom: 10px;
  font-weight: 500;
  color: var(--dark-color);
}

.sample-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.sample-button {
  background-color: var(--secondary-color);
  color: white;
  border: none;
  padding: 6px 12px;
  border-radius: 4px;
  font-size: 14px;
  cursor: pointer;
}

.sample-button:hover {
  background-color: #1B699E;
}

footer {
  margin-top: 40px;
  padding-top: 15px;
  border-top: 1px solid var(--border-color);
  text-align: center;
  font-size: 14px;
  color: #666;
}

.running-indicator {
  display: inline-block;
  margin-left: 10px;
  color: var(--success-color);
  font-size: 14px;
  opacity: 0;
  transition: opacity 0.3s;
}

.running-indicator.visible {
  opacity: 1;
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
  .preview-section {
    flex-direction: column;
  }
  
  .preview-panel {
    width: 100%;
  }
}