diff --git a/ZeroSpace/ZeroSpace.Web/Pages/PlanetaryMasteryItemIndex.razor.css b/ZeroSpace/ZeroSpace.Web/Pages/PlanetaryMasteryItemIndex.razor.css
new file mode 100644
index 0000000..6ea9e95
--- /dev/null
+++ b/ZeroSpace/ZeroSpace.Web/Pages/PlanetaryMasteryItemIndex.razor.css
@@ -0,0 +1,68 @@
+.pmi-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
+    gap: 1rem;
+}
+
+.pmi-card {
+    display: flex;
+    gap: 1rem;
+    align-items: flex-start;
+    padding: 1rem 1.25rem;
+}
+
+.pmi-icon {
+    width: 76px;
+    height: 76px;
+    border-radius: 10px;
+    border: 1px solid var(--zs-border-subtle);
+    background: rgba(0, 0, 0, 0.45);
+    flex-shrink: 0;
+    object-fit: cover;
+}
+
+.pmi-icon-placeholder {
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    color: #38bdf8;
+    font-size: 2rem;
+    text-shadow: 0 0 10px rgba(56, 189, 248, 0.8);
+}
+
+.pmi-body {
+    flex: 1;
+    min-width: 0;
+}
+
+.pmi-name {
+    font-size: 1.15rem;
+    font-weight: 700;
+    color: #fff;
+    margin: 0 0 0.5rem;
+}
+
+.pmi-levels {
+    list-style: none;
+    margin: 0;
+    padding: 0;
+    display: flex;
+    flex-direction: column;
+    gap: 0.25rem;
+}
+
+.pmi-level {
+    display: flex;
+    gap: 0.6rem;
+    align-items: baseline;
+    font-size: 0.9rem;
+    color: #cbd5e1;
+}
+
+.pmi-tier {
+    font-variant-numeric: tabular-nums;
+    color: #38bdf8;
+    font-weight: 700;
+    font-size: 0.8rem;
+    min-width: 1.75rem;
+}