diff --git a/public/cbox/tokens/components.css b/public/cbox/tokens/components.css
index 62348d5..57c3289 100644
--- a/public/cbox/tokens/components.css
+++ b/public/cbox/tokens/components.css
@@ -94,6 +94,12 @@
 .cbx-kv { display: grid; grid-template-columns: 140px 1fr; align-items: baseline; column-gap: 24px; padding: 12px 0; border-bottom: 1px solid var(--border); }
 .cbx-kv:last-child { border-bottom: 0; }
 .cbx-kv dt { text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.6875rem; font-weight: 600; color: var(--muted-foreground); }
+
+/* A small section label above a grouped control (the invoice action panels use it). It was
+   referenced in Blade with no rule behind it, so those headings rendered as plain body text —
+   indistinguishable from the content beneath them. Matches the `.cbx-kv dt` treatment so the
+   two read as one system. */
+.cbx-label { text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.6875rem; font-weight: 600; color: var(--muted-foreground); }
 .cbx-kv dd { margin: 0; font-family: var(--font-mono); font-size: 13px; word-break: break-all; color: var(--foreground); }
 .cbx-kv dd.prose { font-family: var(--font-sans); font-size: 14px; }
 
diff --git a/resources/views/billing/import/index.blade.php b/resources/views/billing/import/index.blade.php
index 73d771a..4cc08fd 100644
--- a/resources/views/billing/import/index.blade.php
+++ b/resources/views/billing/import/index.blade.php
@@ -96,7 +96,7 @@
                             @elseif ($run->status === 'running')
                                 <span class="cbx-pill cbx-pill--warning">running</span>
                             @elseif ($run->status === 'failed')
-                                <span class="cbx-pill cbx-pill--danger">failed</span>
+                                <span class="cbx-pill cbx-pill--destructive">failed</span>
                             @else
                                 <span class="cbx-pill cbx-pill--muted">planned (dry-run)</span>
                             @endif
diff --git a/resources/views/billing/import/plan.blade.php b/resources/views/billing/import/plan.blade.php
index e5f5836..af02460 100644
--- a/resources/views/billing/import/plan.blade.php
+++ b/resources/views/billing/import/plan.blade.php
@@ -7,7 +7,7 @@
         'updated' => 'cbx-pill--info',
         'skipped' => 'cbx-pill--muted',
         'conflict' => 'cbx-pill--warning',
-        'failed' => 'cbx-pill--danger',
+        'failed' => 'cbx-pill--destructive',
         default => 'cbx-pill--muted',
     };
 @endphp
diff --git a/resources/views/billing/import/run.blade.php b/resources/views/billing/import/run.blade.php
index d229f37..6ea0132 100644
--- a/resources/views/billing/import/run.blade.php
+++ b/resources/views/billing/import/run.blade.php
@@ -6,7 +6,7 @@
         'updated' => 'cbx-pill--info',
         'skipped' => 'cbx-pill--muted',
         'conflict' => 'cbx-pill--warning',
-        'failed' => 'cbx-pill--danger',
+        'failed' => 'cbx-pill--destructive',
         default => 'cbx-pill--muted',
     };
 @endphp
diff --git a/resources/views/billing/nexus.blade.php b/resources/views/billing/nexus.blade.php
index 0f9d0de..4bed17a 100644
--- a/resources/views/billing/nexus.blade.php
+++ b/resources/views/billing/nexus.blade.php
@@ -33,7 +33,7 @@
             <p class="cbx-page-desc" style="font-size:13px">Where your default selling entity has — or is approaching — a US sales-tax registration obligation. Thresholds come from the us-tax-data dataset; sales from your invoices (every currency, valued in USD) plus any external-channel sales you record below. <strong>Triggered</strong> = register now; <strong>Approaching</strong> = watch.</p>
         </div>
         <div style="display:flex;gap:8px;align-items:center">
-            <span class="cbx-pill cbx-pill--danger">{{ $triggeredCount }} triggered</span>
+            <span class="cbx-pill cbx-pill--destructive">{{ $triggeredCount }} triggered</span>
             <span class="cbx-pill cbx-pill--warning">{{ $approachingCount }} approaching</span>
             <span class="cbx-pill cbx-pill--success">{{ $registeredCount }} registered</span>
             @if ($unknownCount > 0)<span class="cbx-pill cbx-pill--warning">{{ $unknownCount }} unknown</span>@endif
@@ -76,7 +76,7 @@
                         <td class="mut" style="font-size:12.5px">{{ $e->threshold?->describe() ?? '—' }}</td>
                         <td class="num">{{ $e->progress !== null ? number_format($e->progress * 100, 1).'%' : '—' }}</td>
                         <td style="font-size:11.5px">
-                            @if ($e->physicalPresence)<span class="cbx-pill cbx-pill--neutral">presence</span>@endif
+                            @if ($e->physicalPresence)<span class="cbx-pill cbx-pill--muted">presence</span>@endif
                             @if (in_array($e->state->value, $registeredStates, true))<span class="cbx-pill cbx-pill--success">registered</span>@endif
                         </td>
                     </tr>
diff --git a/resources/views/layouts/app.blade.php b/resources/views/layouts/app.blade.php
index 9b789dd..69f6aac 100644
--- a/resources/views/layouts/app.blade.php
+++ b/resources/views/layouts/app.blade.php
@@ -164,7 +164,7 @@ class="cbx-btn cbx-btn--sm cbx-btn--ghost @if(! empty($testMode)) cbx-pill--warn
                 @if (! empty($environments))
                     <details class="cbx-env-clone" style="position:relative">
                         <summary class="cbx-btn cbx-btn--sm cbx-btn--ghost" style="height:28px;list-style:none;cursor:pointer;display:inline-flex;align-items:center;gap:5px" title="Clone an environment's config into a new sandbox">@include('partials.icon', ['name' => 'copy', 'size' => 13, 'sw' => 1.7])<span>Clone</span></summary>
-                        <form method="POST" action="{{ route('billing.environment.clone') }}" class="cbx-card"
+                        <form method="POST" action="{{ route('billing.environment.clone') }}" class="cbx-panel"
                               style="position:absolute;top:calc(100% + 6px);right:0;z-index:40;width:280px;padding:12px;display:flex;flex-direction:column;gap:8px">
                             @csrf
                             <div style="font-size:11px;font-weight:600;color:var(--muted-foreground)">Clone environment config</div>
diff --git a/tests/Feature/DesignSystemClassesTest.php b/tests/Feature/DesignSystemClassesTest.php
new file mode 100644
index 0000000..a69db41
--- /dev/null
+++ b/tests/Feature/DesignSystemClassesTest.php
@@ -0,0 +1,143 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Tests\Feature;
+
+use Tests\TestCase;
+
+/**
+ * Every `cbx-*` class used in a Blade template must have a rule behind it.
+ *
+ * A class name with no rule fails SILENTLY — the element just renders unstyled, and in a
+ * console that mostly looks fine, so nothing draws attention to it. The review found four:
+ *
+ *   - `.cbx-pill--danger` (the design system's variant is `--destructive`). On /console/nexus
+ *     that made "3 triggered" — meaning US economic-nexus thresholds are crossed and the seller
+ *     has an unregistered tax liability — render as the same neutral chip as any inert label.
+ *     The severity signal was dropped entirely, on the page whose only job is severity.
+ *   - `.cbx-pill--neutral`, which happened to coincide with the default and so was harmless.
+ *   - `.cbx-card` on the console topbar's clone popover: no background, no border, no shadow,
+ *     so the form rendered transparent over the table beneath it — on every console page.
+ *   - `.cbx-label`, which left section headings looking like body text.
+ *
+ * A rendering test would not have caught any of these: the markup was valid and the page
+ * returned 200. Only comparing the two sources does.
+ */
+class DesignSystemClassesTest extends TestCase
+{
+    /**
+     * Class names that carry NO rule and are not meant to.
+     *
+     * These elements are styled by inline `style=` attributes, so nothing renders wrong — the
+     * class is a leftover semantic hook. That is cosmetic debt, not the defect this test exists
+     * to catch, which is an element that DEPENDS on a class for its appearance and silently
+     * loses it (`.cbx-pill--danger` dropping the severity colour on the nexus page).
+     *
+     * Each entry is a deliberate acceptance, not a blanket allowance: a NEW undefined class
+     * still fails. Tracked for cleanup alongside the inline-style dialect they belong to.
+     */
+    private const array EXEMPT = [
+        'cbx-testmode-strip',
+        'cbx-strip-expand',
+        'cbx-env-clone',
+        'cbx-input--sm',
+        'cbx-confirm-plane',
+        'cbx-pricing',
+        'cbx-pricing-card',
+        'cbx-paywall',
+        'cbx-upgrade',
+    ];
+
+    public function test_every_cbx_class_used_in_blade_is_defined_in_the_stylesheets(): void
+    {
+        $defined = $this->definedClasses();
+        $this->assertNotSame([], $defined, 'No cbx-* rules found — the stylesheet paths are wrong.');
+
+        $undefined = [];
+
+        foreach ($this->bladeFiles() as $file) {
+            $contents = (string) file_get_contents($file);
+
+            // Only `class="..."` attributes, so prose and comments mentioning a class name
+            // cannot trip the check.
+            preg_match_all('/class\s*=\s*"([^"]*)"/', $contents, $attributes);
+
+            foreach ($attributes[1] as $attribute) {
+                foreach (preg_split('/\s+/', $attribute) ?: [] as $class) {
+                    if (! str_starts_with($class, 'cbx-') || str_contains($class, '{')) {
+                        continue; // interpolated (`{{ }}`) classes are resolved at runtime
+                    }
+
+                    if (! in_array($class, $defined, true) && ! in_array($class, self::EXEMPT, true)) {
+                        $undefined[$class][] = basename((string) $file);
+                    }
+                }
+            }
+        }
+
+        $this->assertSame([], $undefined, $this->describe($undefined));
+    }
+
+    /** @return list<string> */
+    private function definedClasses(): array
+    {
+        $classes = [];
+
+        foreach (glob(public_path('cbox/**/*.css')) ?: [] as $sheet) {
+            preg_match_all('/\.(cbx-[A-Za-z0-9_-]+)/', (string) file_get_contents($sheet), $matches);
+            $classes = [...$classes, ...$matches[1]];
+        }
+
+        foreach (glob(public_path('cbox/*.css')) ?: [] as $sheet) {
+            preg_match_all('/\.(cbx-[A-Za-z0-9_-]+)/', (string) file_get_contents($sheet), $matches);
+            $classes = [...$classes, ...$matches[1]];
+        }
+
+        // Blade `<style>` blocks count as definitions: the public storefront, paywall and quote
+        // pages are deliberately self-contained (CSP-safe, no external stylesheet), so their
+        // rules legitimately live inline. Ignoring them would push working CSS out of the pages
+        // that are designed to carry it.
+        foreach ($this->bladeFiles() as $file) {
+            preg_match_all('/<style[^>]*>(.*?)<\\/style>/s', (string) file_get_contents($file), $blocks);
+
+            foreach ($blocks[1] as $block) {
+                preg_match_all('/\\.(cbx-[A-Za-z0-9_-]+)/', $block, $matches);
+                $classes = [...$classes, ...$matches[1]];
+            }
+        }
+
+        return array_values(array_unique($classes));
+    }
+
+    /** @return list<string> */
+    private function bladeFiles(): array
+    {
+        $files = [];
+        $directory = new \RecursiveIteratorIterator(new \RecursiveDirectoryIterator(resource_path('views')));
+
+        foreach ($directory as $file) {
+            if ($file instanceof \SplFileInfo && str_ends_with($file->getFilename(), '.blade.php')) {
+                $files[] = $file->getPathname();
+            }
+        }
+
+        return $files;
+    }
+
+    /** @param  array<string, list<string>>  $undefined */
+    private function describe(array $undefined): string
+    {
+        if ($undefined === []) {
+            return '';
+        }
+
+        $lines = ['These cbx-* classes are used in Blade but defined in no stylesheet, so they render as nothing:'];
+
+        foreach ($undefined as $class => $files) {
+            $lines[] = sprintf('  .%s — %s', $class, implode(', ', array_unique($files)));
+        }
+
+        return implode("\n", $lines);
+    }
+}