v3: the invite tree spaces every row the same — a child sat 0.2rem under its parent but siblings 0.4rem apart, since each row's spacing was split into top and bottom padding and a last child dropped its bottom half. Every row now has one gap above it (--invite-tree-gap), the connectors run through it from the same variable, and the user link is a block, so a theme's line height can't push the avatar off the connector's center.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/App.css

@@ -5729,7 +5729,13 @@ body.has-player .chat-fab {
 }
 
 /* ── Invite tree ── */
+/* Every row but the very first has the same gap above it, a child's as a
+   sibling's: the gap is the node's top padding, so the connectors can run
+   through it. --invite-tree-avatar-center is where a row's avatar is centered,
+   from the top of its node. */
 .invite-tree {
+  --invite-tree-gap: 0.5rem;
+  --invite-tree-avatar-center: calc(var(--invite-tree-gap) + 12px);
   list-style: none;
   padding: 0;
   margin: 0;
@@ -5737,60 +5743,54 @@ body.has-player .chat-fab {
 
 .invite-tree-node {
   position: relative;
-  padding: 0.2rem 0;
+  padding-top: var(--invite-tree-gap);
 }
 
-.invite-tree-node:last-child {
+.invite-tree-node:first-child:not(.invite-tree-node .invite-tree-node) {
-  padding-bottom: 0;
+  padding-top: 0;
 }
 
-/* Child list: indented so connector lines have room on the left.
+/* A child list is indented so that the vertical connector, at its left edge,
-   The vertical line sits at the list's left:0, centered under the parent
+   is centered under the parent's 24px avatar (12px center - 1px half-line). */
-   avatar (avatar center 12px - 1px half-line = 11px). */
 .invite-tree-node > .invite-tree {
   margin-left: 11px;
   padding-left: calc(12px + 0.5rem);
 }
 
-/* Connectors are owned per child node (not by the list) so they always anchor
+/* Each child draws its own connectors, so they anchor to its avatar however
-   to that child's own avatar center, regardless of how deep its subtree is.
+   deep its subtree is. The vertical one drops from the row above to its
-   --avatar-center = node top padding (0.2rem) + half the 24px avatar (12px). */
+   avatar center, and on through its subtree when a sibling follows. */
-.invite-tree-node > .invite-tree > .invite-tree-node {
+.invite-tree-node .invite-tree-node::before {
-  --avatar-center: calc(0.2rem + 12px);
-}
-
-/* Vertical segment: drops from the top of the child node to its avatar center,
-   joining the line coming down from the parent / previous sibling. */
-.invite-tree-node > .invite-tree > .invite-tree-node::before {
   content: "";
   position: absolute;
   left: calc(-12px - 0.5rem);
   top: 0;
-  height: var(--avatar-center);
+  height: var(--invite-tree-avatar-center);
   width: 2px;
   background: var(--color-border-subtle);
 }
 
-/* Non-last children extend the vertical segment through their full height
+.invite-tree-node .invite-tree-node:not(:last-child)::before {
-   (including any subtree) so it reaches the next sibling. */
-.invite-tree-node > .invite-tree > .invite-tree-node:not(:last-child)::before {
   height: auto;
   bottom: 0;
 }
 
-/* Horizontal connector: from the vertical line to the child's avatar. */
+/* The horizontal one runs from the vertical line to the avatar. */
-.invite-tree-node > .invite-tree > .invite-tree-node::after {
+.invite-tree-node .invite-tree-node::after {
   content: "";
   position: absolute;
   left: calc(-12px - 0.5rem);
-  top: calc(var(--avatar-center) - 1px); /* straddle center with the 2px bar */
+  top: calc(var(--invite-tree-avatar-center) - 1px);
   width: calc(12px + 0.5rem);
   height: 2px;
   background: var(--color-border-subtle);
 }
 
+/* A block, not inline: in a line box, the theme's line height would add space
+   under the avatar and move it off --invite-tree-avatar-center. */
 .invite-tree-user {
-  display: inline-flex;
+  display: flex;
+  width: fit-content;
   align-items: center;
   gap: 0.5rem;
   color: var(--color-text);