diff --git a/src/iceberg/static/css/iceberg.css b/src/iceberg/static/css/iceberg.css
index af74a93..769b13f 100644
--- a/src/iceberg/static/css/iceberg.css
+++ b/src/iceberg/static/css/iceberg.css
@@ -109,7 +109,7 @@ a:hover { color: var(--accent-deep); }
   display: flex; align-items: center; gap: 18px 28px;
 }
 .brand { display: inline-flex; align-items: center; gap: 10px; }
-.brand-mark { width: 22px; height: 22px; display: block; flex: none; }
+.brand-mark { width: 30px; height: 30px; display: block; flex: none; }
 .brand-name {
   font-weight: 800; font-size: 18px; letter-spacing: 0.04em;
   color: var(--ink);
@@ -172,7 +172,7 @@ a:hover { color: var(--accent-deep); }
   display: flex; align-items: center; gap: 10px;
   padding: 18px 18px 16px;
 }
-.rail-brand .brand-mark { width: 22px; height: 22px; }
+.rail-brand .brand-mark { width: 30px; height: 30px; }
 .rail-wordmark { font-weight: 800; font-size: 18px; letter-spacing: 0.02em; color: #fff; }
 .rail-nav { flex: 1; overflow-y: auto; padding: 6px 12px 12px; }
 .rail-group { margin-top: 14px; }
diff --git a/src/iceberg/static/img/icebergai-mark.svg b/src/iceberg/static/img/icebergai-mark.svg
new file mode 100644
index 0000000..41a7de7
--- /dev/null
+++ b/src/iceberg/static/img/icebergai-mark.svg
@@ -0,0 +1,19 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="400" height="400" viewBox="0 0 400 400"><defs>
+    <linearGradient id="iceAM" x1="0" y1="0" x2="0.4" y2="1">
+      <stop offset="0" stop-color="#f2fbff"/><stop offset="1" stop-color="#bfe6fa"/>
+    </linearGradient>
+    <linearGradient id="iceBM" x1="0" y1="0" x2="0.5" y2="1">
+      <stop offset="0" stop-color="#bfe6fa"/><stop offset="1" stop-color="#93cbe9"/>
+    </linearGradient>
+    <linearGradient id="subM" x1="0" y1="0" x2="0.2" y2="1">
+      <stop offset="0" stop-color="#3f9bd1"/>
+      <stop offset="0.55" stop-color="#256f9f"/>
+      <stop offset="1" stop-color="#143f5f"/>
+    </linearGradient>
+    <radialGradient id="tileM" cx="0.5" cy="0.36" r="0.8">
+      <stop offset="0" stop-color="#102b42"/><stop offset="1" stop-color="#0a1826"/>
+    </radialGradient>
+    <radialGradient id="glowM" cx="0.5" cy="0.5" r="0.5">
+      <stop offset="0" stop-color="#3fd2e6" stop-opacity="0.5"/>
+      <stop offset="1" stop-color="#3fd2e6" stop-opacity="0"/>
+    </radialGradient></defs><rect width="400" height="400" rx="92" fill="url(#tileM)"/><rect x="6" y="6" width="388" height="388" rx="86" fill="none" stroke="#3fd2e6" stroke-width="3" opacity="0.18"/><g transform="translate(100 58) scale(1.0)"><polygon points="50.0,112.0 30.0,150.0 42.0,193.0 78.0,221.0 112.0,227.0 150.0,205.0 172.0,150.0 150.0,112.0" fill="url(#subM)"/><polygon points="90.0,112.0 50.0,112.0 30.0,150.0 42.0,193.0 78.0,221.0 112.0,227.0" fill="#143f5f" opacity="0.35"/><line x1="90.0" y1="112.0" x2="112.0" y2="227.0" stroke="#f2fbff" stroke-width="1" opacity="0.15"/><line x1="50.0" y1="112.0" x2="42.0" y2="193.0" stroke="#f2fbff" stroke-width="1" opacity="0.15"/><line x1="150.0" y1="112.0" x2="150.0" y2="205.0" stroke="#f2fbff" stroke-width="1" opacity="0.15"/><line x1="70.0" y1="150.0" x2="104.0" y2="174.0" stroke="#3fd2e6" stroke-width="1.1" opacity="0.45"/><line x1="104.0" y1="174.0" x2="136.0" y2="156.0" stroke="#3fd2e6" stroke-width="1.1" opacity="0.45"/><line x1="104.0" y1="174.0" x2="92.0" y2="202.0" stroke="#3fd2e6" stroke-width="1.1" opacity="0.45"/><line x1="92.0" y1="202.0" x2="124.0" y2="196.0" stroke="#3fd2e6" stroke-width="1.1" opacity="0.45"/><line x1="136.0" y1="156.0" x2="124.0" y2="196.0" stroke="#3fd2e6" stroke-width="1.1" opacity="0.45"/><line x1="70.0" y1="150.0" x2="92.0" y2="202.0" stroke="#3fd2e6" stroke-width="1.1" opacity="0.45"/><circle cx="70.0" cy="150.0" r="4.4" fill="url(#glowM)"/><circle cx="70.0" cy="150.0" r="2.2" fill="#9defff"/><circle cx="104.0" cy="174.0" r="4.4" fill="url(#glowM)"/><circle cx="104.0" cy="174.0" r="2.2" fill="#9defff"/><circle cx="136.0" cy="156.0" r="4.4" fill="url(#glowM)"/><circle cx="136.0" cy="156.0" r="2.2" fill="#9defff"/><circle cx="92.0" cy="202.0" r="4.4" fill="url(#glowM)"/><circle cx="92.0" cy="202.0" r="2.2" fill="#9defff"/><circle cx="124.0" cy="196.0" r="4.4" fill="url(#glowM)"/><circle cx="124.0" cy="196.0" r="2.2" fill="#9defff"/><line x1="27" y1="112" x2="173" y2="112" stroke="#67d8e6" stroke-width="2.4" stroke-linecap="round" opacity="0.9"/><line x1="34" y1="112" x2="166" y2="112" stroke="#f2fbff" stroke-width="0.8" stroke-linecap="round" opacity="0.5"/><polygon points="98.0,26.0 90.0,112.0 150.0,112.0 124.0,60.0" fill="url(#iceBM)"/><polygon points="98.0,26.0 68.0,76.0 50.0,112.0 90.0,112.0" fill="url(#iceAM)"/><polygon points="98.0,26.0 86.0,58.0 80.0,92.0 68.0,76.0" fill="#f2fbff" opacity="0.55"/><line x1="98.0" y1="26.0" x2="90.0" y2="112.0" stroke="#6aa8cf" stroke-width="1" opacity="0.5"/><polyline points="50.0,112.0 68.0,76.0 98.0,26.0 124.0,60.0 150.0,112.0" fill="none" stroke="#f2fbff" stroke-width="1.2" opacity="0.6" stroke-linejoin="round"/></g></svg>
\ No newline at end of file
diff --git a/src/iceberg/templates/_glyph.html b/src/iceberg/templates/_glyph.html
index 4fda0f4..a367f62 100644
--- a/src/iceberg/templates/_glyph.html
+++ b/src/iceberg/templates/_glyph.html
@@ -1,7 +1,6 @@
-{# Iceberg mark: a peak above a waterline, larger submerged mass below.
-   "The tip of the iceberg." Pure geometry. #}
-<svg class="brand-mark" viewBox="0 0 24 24" fill="none" xmlns="http://www.w3.org/2000/svg" aria-hidden="true">
-  <path d="M12 2.4 L19.2 11 H4.8 Z" fill="var(--accent-ink)"/>
-  <path d="M5 12.6 H19 L12 21.6 Z" fill="var(--accent)" opacity="0.32"/>
-  <path d="M5 12.6 H19" stroke="var(--accent)" stroke-width="1.4" stroke-linecap="round"/>
-</svg>
+{# The IcebergAI brand mark — the shared dark rounded chip used across the
+   family (same asset as IcebergTTX/EBS; canonical source
+   ~/Projects/.github/profile/assets/icebergai-mark.svg). The chip carries its
+   own background + rounding, so it sits on the dark rail and the light auth
+   card alike. #}
+<img src="/static/img/icebergai-mark.svg" class="brand-mark" width="30" height="30" alt="">