diff --git a/frontend/index.html b/frontend/index.html
index 5576587..529d6dd 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -134,6 +134,53 @@
             box-shadow: 0 -1px 4px rgba(0, 0, 0, 0.1);
         }
 
+        /* ── Windows Chrome / Edge — rounded top only, more angular ── */
+        .os-windows.browser-chrome .tab,
+        .os-windows.browser-edge .tab {
+            border-radius: 0;
+            margin: 3px 2px;
+            padding: 3px 12px;
+            height: 30px;
+            position: relative;
+        }
+
+        .os-windows.browser-chrome .tab::before,
+        .os-windows.browser-edge .tab::before {
+            content: "";
+            position: absolute;
+            left: -2px;
+            top: 25%;
+            height: 50%;
+            width: 1px;
+            background: var(--tab-border);
+        }
+
+        .os-windows.browser-chrome .tab:hover::before,
+        .os-windows.browser-chrome .tab-active::before,
+        .os-windows.browser-chrome .tab:hover + .tab::before,
+        .os-windows.browser-chrome .tab-active + .tab::before,
+        .os-windows.browser-edge .tab:hover::before,
+        .os-windows.browser-edge .tab-active::before,
+        .os-windows.browser-edge .tab:hover + .tab::before,
+        .os-windows.browser-edge .tab-active + .tab::before {
+            background: transparent;
+        }
+
+        .os-windows.browser-chrome .tab:hover,
+        .os-windows.browser-edge .tab:hover {
+            background: var(--tab-hover);
+            border-radius: 8px 8px 0 0;
+        }
+
+        .os-windows.browser-chrome .tab-active,
+        .os-windows.browser-chrome .tab-active:hover,
+        .os-windows.browser-edge .tab-active,
+        .os-windows.browser-edge .tab-active:hover {
+            background: var(--tab-bg);
+            border-radius: 8px 8px 0 0;
+            box-shadow: 0 -1px 4px rgba(0, 0, 0, 0.1);
+        }
+
         /* ── Safari (Mac only) ── */
         /* Compact, flat, evenly spaced, no icons on inactive tabs */
         .browser-safari .tab {