body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: var(--bg-color, #f5f5f5);
    transition: background-color 0.3s;
}
.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}
h1 {
    color: var(--text-color, #333);
    margin: 0;
    transition: color 0.3s;
}
.theme-selector {
    display: flex;
    align-items: center;
    gap: 8px;
}
.theme-selector label {
    font-size: 14px;
    color: var(--label-color, #666);
    transition: color 0.3s;
}
.theme-selector select {
    padding: 6px 12px;
    border-radius: 6px;
    border: 1px solid var(--border-color, #ccc);
    background: var(--select-bg, white);
    color: var(--text-color, #333);
    font-size: 14px;
    cursor: pointer;
    transition: all 0.3s;
}
.theme-selector select:hover {
    border-color: var(--border-hover, #999);
}
.mermaid-container {
    background-color: var(--container-bg, white);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s;
}
.mermaid {
    display: flex;
    justify-content: center;
}


