```html
<!-- Universal 4px ink horizontal rule. The system's structural rhythm.
     Used as section separator, list-row border, tile divider. Never 1px,
     never 2px (2px reserved for chart grid lines only). -->
<hr class="ee-divider-loud" />

<style>
  .ee-divider-loud {
    width: 100%;
    height: var(--ee-rule-weight);
    background: var(--ink);
    border: 0;
    margin: 0;
    padding: 0;
  }
</style>
```
