panels

frontend/src/styles/sidebar/sidebar.css

@@ -128,10 +128,53 @@
   color: var(--sidebar-fg);
   display: flex;
   flex-direction: column;
-  width: 20em;
-  max-width: 20em;
-  flex: 0 0 20em;
+  width: min(100vw, var(--sidebar-width));
+  max-width: min(100vw, var(--sidebar-width));
+  flex: 0 0 var(--sidebar-width);
   background: var(--bg);
+  position: relative;
+}
+
+.sidebar--resizing {
+  cursor: col-resize;
+  user-select: none;
+}
+
+.sidebar__resize-handle {
+  position: absolute;
+  top: 0;
+  right: -0.4rem;
+  width: 0.8rem;
+  height: 100%;
+  border: none;
+  background: transparent;
+  padding: 0;
+  margin: 0;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  cursor: col-resize;
+  z-index: 1;
+}
+
+.sidebar__resize-handle span {
+  width: 2px;
+  height: 32px;
+  border-radius: 999px;
+  background: transparent;
+  transition: background 120ms ease;
+}
+
+.sidebar__resize-handle:hover span,
+.sidebar__resize-handle:focus-visible span,
+.sidebar__resize-handle.is-active span {
+  background: var(--accent);
+}
+
+.sidebar__resize-handle:focus-visible {
+  outline: 2px solid color-mix(in oklch, var(--accent) 60%, transparent);
+  outline-offset: 2px;
+  border-radius: 999px;
 }
 
 .sidebar__body {