diff --git a/e2e/tests/__m.spec.ts b/e2e/tests/__m.spec.ts
new file mode 100644
index 0000000..83240c0
--- /dev/null
+++ b/e2e/tests/__m.spec.ts
@@ -0,0 +1,36 @@
+import { test } from '@playwright/test';
+test('mobile hero geometry', async ({ page }) => {
+  await page.setViewportSize({ width: 390, height: 844 });
+  await page.goto('/');
+  const out = await page.evaluate(() => {
+    const pick = (sel: string) => {
+      const el = document.querySelector(sel) as HTMLElement | null;
+      if (!el) return null;
+      const r = el.getBoundingClientRect();
+      const cs = getComputedStyle(el);
+      return { left: Math.round(r.left), right: Math.round(r.right),
+               width: Math.round(r.width), height: Math.round(r.height),
+               pad: cs.padding, cls: el.className.toString().slice(0, 40) };
+    };
+    const input = document.querySelector('input[type="search"]') as HTMLElement;
+    const box = input?.closest('div');
+    const form = input?.closest('form');
+    return {
+      h1: pick('h1'),
+      lede: pick('h1 + p') ?? pick('p'),
+      omniBox: box ? { left: Math.round(box.getBoundingClientRect().left),
+                       width: Math.round(box.getBoundingClientRect().width),
+                       pad: getComputedStyle(box).padding,
+                       dir: getComputedStyle(box).flexDirection,
+                       cls: box.className.toString().slice(0,40) } : null,
+      input: pick('input[type="search"]'),
+      form: form ? { left: Math.round(form.getBoundingClientRect().left),
+                     width: Math.round(form.getBoundingClientRect().width),
+                     pad: getComputedStyle(form).padding,
+                     cls: form.className.toString().slice(0,40) } : null,
+      filterBar: pick('form').  // placeholder
+        constructor === Object ? null : null,
+    };
+  });
+  console.log(JSON.stringify(out, null, 2));
+});
diff --git a/nextjs-app/__tests__/components/filterBarScoping.test.ts b/nextjs-app/__tests__/components/filterBarScoping.test.ts
new file mode 100644
index 0000000..38ddf3b
--- /dev/null
+++ b/nextjs-app/__tests__/components/filterBarScoping.test.ts
@@ -0,0 +1,82 @@
+import fs from 'fs';
+import path from 'path';
+
+/**
+ * The hero search and the results filter bar are the same component in two
+ * costumes. `.filterBar` is the card — background, border, shadow, padding —
+ * and `.heroMode` strips all of it so the search sits directly on the hero
+ * panel.
+ *
+ * Both selectors have specificity (0,1,0), so **source order decides**, and
+ * `.heroMode` only wins because it is declared immediately after. Any later
+ * bare `.filterBar` rule — which in practice means one inside a media query —
+ * silently wins instead, and the hero grows a card's padding back.
+ *
+ * That is exactly what happened: `@media (max-width: 768px) { .filterBar {
+ * padding: 0.875rem } }` re-added 14px in hero mode, indenting the search box,
+ * the hint and the location link 14px past the headline above them and costing
+ * the search field 28px of width on a 390px screen. The two rules directly
+ * below it in the same block were correctly written as
+ * `.filterBar:not(.heroMode)`; this one was missed, and nothing caught it
+ * because the result is a plausible-looking layout rather than a broken one.
+ */
+
+const CSS = path.join(__dirname, '..', '..', 'components', 'FilterBar.module.css');
+
+/** Properties `.heroMode` resets. A later bare `.filterBar` rule setting any
+ *  of these puts the card back on the hero. */
+const RESET_BY_HERO_MODE = [
+  'background', 'border', 'border-radius', 'box-shadow', 'padding',
+];
+
+function mediaQueryBodies(css: string): string[] {
+  const bodies: string[] = [];
+  const re = /@media[^{]*\{/g;
+  let m: RegExpExecArray | null;
+  while ((m = re.exec(css)) !== null) {
+    // Walk braces from the opening one to find this at-rule's whole body.
+    let depth = 1;
+    let i = m.index + m[0].length;
+    const start = i;
+    while (i < css.length && depth > 0) {
+      if (css[i] === '{') depth++;
+      else if (css[i] === '}') depth--;
+      i++;
+    }
+    bodies.push(css.slice(start, i - 1));
+  }
+  return bodies;
+}
+
+describe('FilterBar hero-mode scoping', () => {
+  const css = fs.readFileSync(CSS, 'utf8');
+
+  it('confirms heroMode still resets the card, which is what makes this matter', () => {
+    const hero = css.match(/\.heroMode\s*\{([^}]*)\}/);
+    expect(hero).not.toBeNull();
+    expect(hero![1]).toMatch(/padding:\s*0/);
+  });
+
+  it('never re-applies card styling to the hero from inside a media query', () => {
+    const offenders: string[] = [];
+
+    for (const body of mediaQueryBodies(css)) {
+      for (const rule of body.matchAll(/([^{}]+)\{([^{}]*)\}/g)) {
+        const selector = rule[1].trim().split('\n').pop()!.trim();
+        // Only a *bare* .filterBar is dangerous. Scoped variants
+        // (`.filterBar:not(.heroMode)`) and descendants are fine.
+        if (selector !== '.filterBar') continue;
+
+        for (const prop of RESET_BY_HERO_MODE) {
+          if (new RegExp(`(^|[;\\s])${prop}\\s*:`).test(rule[2])) {
+            offenders.push(`${selector} sets ${prop}`);
+          }
+        }
+      }
+    }
+
+    // Fix by scoping the rule as `.filterBar:not(.heroMode)`, the way the
+    // neighbouring rules in the same block already are.
+    expect(offenders).toEqual([]);
+  });
+});
diff --git a/nextjs-app/components/FilterBar.module.css b/nextjs-app/components/FilterBar.module.css
index 7384f60..287c6d3 100644
--- a/nextjs-app/components/FilterBar.module.css
+++ b/nextjs-app/components/FilterBar.module.css
@@ -413,7 +413,17 @@
 /* ── Narrow ───────────────────────────────────────────────────────── */
 
 @media (max-width: 768px) {
-  .filterBar {
+  /*
+   * Scoped, like the two rules below it.
+   *
+   * The results filter bar is a card — background, border, shadow — and needs
+   * inner padding. The hero's search is not a card: .heroMode zeroes the
+   * padding, border and background so the search sits directly on the panel.
+   * Unscoped, this rule put 14px back, which indented the search box, the hint
+   * and the location link 14px past the headline they sit under, and cost the
+   * search field 28px of width on a 390px screen.
+   */
+  .filterBar:not(.heroMode) {
     padding: 0.875rem;
   }
 
@@ -457,6 +467,14 @@
     align-items: flex-start;
   }
 
+  /* Optical alignment: the button's own 6px of padding is what makes its
+     label start further right than the hint above it, even once both boxes
+     share a left edge. Pulling the padding back off lines the text up while
+     keeping the tap target. */
+  .heroMode .nearMeBtn {
+    margin-left: -0.375rem;
+  }
+
   .geoError {
     text-align: left;
   }