<div class="theme-toggle instance-theme-toggle" role="group" aria-label="界面主题">
    <button type="button" class="theme-toggle-btn is-active" data-theme-value="dark" aria-pressed="true" title="暗色主题">
        <svg class="theme-icon" viewBox="0 0 24 24" width="18" height="18" aria-hidden="true">
            <path fill="currentColor" d="M12.1 3a9 9 0 1 0 8.9 11 6.5 6.5 0 1 1-8.9-11z"/>
        </svg>
    </button>
    <button type="button" class="theme-toggle-btn" data-theme-value="light" aria-pressed="false" title="亮色主题">
        <svg class="theme-icon" viewBox="0 0 24 24" width="18" height="18" aria-hidden="true" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round">
            <circle cx="12" cy="12" r="4"/><path d="M12 2v2M12 20v2M4.93 4.93l1.41 1.41M17.66 17.66l1.41 1.41M2 12h2M20 12h2M4.93 19.07l1.41-1.41M17.66 6.34l1.41-1.41"/>
        </svg>
    </button>
</div>
