diff --git a/ZeroSpace/ZeroSpace.Web/Pages/Galaxy.razor.css b/ZeroSpace/ZeroSpace.Web/Pages/Galaxy.razor.css
index 00090d5..f4a1e13 100644
--- a/ZeroSpace/ZeroSpace.Web/Pages/Galaxy.razor.css
+++ b/ZeroSpace/ZeroSpace.Web/Pages/Galaxy.razor.css
@@ -373,3 +373,209 @@
     font-size: 0.72rem;
     letter-spacing: 0.2px;
 }
+
+/* Galaxy layout with right-side faction drawer */
+.galaxy-layout {
+    display: flex;
+    align-items: flex-start;
+    gap: 1rem;
+}
+
+.galaxy-layout .galaxy-map-container {
+    margin: 0;
+    max-width: none;
+    min-width: 0;
+    flex: 1 1 auto;
+}
+
+.faction-drawer {
+    width: 330px;
+    flex: 0 0 auto;
+    border-radius: 12px;
+    padding: 1rem;
+    position: sticky;
+    top: 1rem;
+    max-height: calc(100vh - 2rem);
+    display: flex;
+    flex-direction: column;
+}
+
+.faction-drawer.is-collapsed {
+    width: auto;
+}
+
+.drawer-title {
+    font-size: 1rem;
+}
+
+.drawer-subtitle {
+    font-size: 0.72rem;
+}
+
+.drawer-body {
+    overflow-y: auto;
+    margin-top: 0.75rem;
+    display: flex;
+    flex-direction: column;
+    gap: 1rem;
+    min-height: 0;
+}
+
+/* Faction picker: always exactly one selected */
+.faction-picker {
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+}
+
+.faction-pick {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    width: 100%;
+    background: rgba(255, 255, 255, 0.03);
+    border: 1px solid rgba(139, 148, 158, 0.25);
+    border-radius: 8px;
+    color: #c9d1d9;
+    padding: 8px 10px;
+    font-size: 0.85rem;
+    cursor: pointer;
+    text-align: left;
+    transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
+}
+
+.faction-pick:hover {
+    background: rgba(255, 255, 255, 0.06);
+}
+
+.faction-pick-name {
+    flex: 1 1 auto;
+    font-weight: 600;
+}
+
+.faction-pick-count {
+    font-size: 0.72rem;
+    color: #8b949e;
+    background: rgba(0, 0, 0, 0.35);
+    border-radius: 10px;
+    padding: 1px 8px;
+}
+
+.faction-pick.is-active {
+    background: rgba(255, 255, 255, 0.06);
+}
+
+.faction-pick.is-active.owner-eden {
+    border-color: rgba(16, 185, 129, 0.7);
+    box-shadow: 0 0 12px rgba(16, 185, 129, 0.15);
+}
+
+.faction-pick.is-active.owner-keeper {
+    border-color: rgba(56, 189, 248, 0.7);
+    box-shadow: 0 0 12px rgba(56, 189, 248, 0.15);
+}
+
+.faction-pick.is-active.owner-obsidian {
+    border-color: rgba(239, 68, 68, 0.7);
+    box-shadow: 0 0 12px rgba(239, 68, 68, 0.15);
+}
+
+/* Drawer sections */
+.drawer-section-title {
+    font-size: 0.72rem;
+    text-transform: uppercase;
+    letter-spacing: 0.6px;
+    color: #8b949e;
+    font-weight: 700;
+    margin-bottom: 0.5rem;
+}
+
+.drawer-summary {
+    font-size: 0.85rem;
+}
+
+/* Aggregated bonus rows */
+.bonus-list {
+    display: flex;
+    flex-direction: column;
+    gap: 6px;
+}
+
+.bonus-row {
+    display: grid;
+    grid-template-columns: auto 1fr auto;
+    gap: 8px;
+    align-items: baseline;
+    background: rgba(255, 255, 255, 0.03);
+    border: 1px solid rgba(139, 148, 158, 0.18);
+    border-radius: 8px;
+    padding: 6px 10px;
+}
+
+.bonus-total {
+    color: #34d399;
+    font-weight: 700;
+    font-size: 0.9rem;
+    white-space: nowrap;
+}
+
+.bonus-label {
+    color: #c9d1d9;
+    font-size: 0.8rem;
+}
+
+.bonus-count {
+    color: #8b949e;
+    font-size: 0.72rem;
+    white-space: nowrap;
+}
+
+/* Planet list */
+.planet-list {
+    display: flex;
+    flex-direction: column;
+    gap: 4px;
+}
+
+.planet-row {
+    display: flex;
+    justify-content: space-between;
+    gap: 8px;
+    align-items: baseline;
+    width: 100%;
+    text-align: left;
+    background: transparent;
+    border: 1px solid transparent;
+    border-radius: 6px;
+    color: #c9d1d9;
+    padding: 5px 8px;
+    cursor: pointer;
+    font-size: 0.8rem;
+}
+
+.planet-row:hover {
+    background: rgba(56, 189, 248, 0.08);
+    border-color: rgba(56, 189, 248, 0.25);
+}
+
+.planet-name {
+    font-weight: 600;
+}
+
+.planet-buff {
+    color: #34d399;
+    font-size: 0.75rem;
+    text-align: right;
+}
+
+@media (max-width: 992px) {
+    .galaxy-layout {
+        flex-direction: column;
+    }
+
+    .faction-drawer {
+        width: 100%;
+        max-height: none;
+        position: static;
+    }
+}