--- a/hg-web/src/index.css	Sun Aug 02 08:52:13 2026 -0700
+++ b/hg-web/src/index.css	Sun Aug 02 14:42:01 2026 -0700
@@ -270,13 +270,15 @@
   align-items: flex-start;
   max-height: 600px;
   overflow-y: auto;
+  position: relative;
 }
 
 .graph-canvas-column {
   flex-shrink: 0;
-  background: var(--bg);
   position: sticky;
   left: 0;
+  z-index: 1;
+  border-right: 1px solid var(--border);
 }
 
 .graph-details-column {
@@ -285,11 +287,16 @@
 }
 
 .graph-row {
+  width: 100%;
   height: 40px;
   display: flex;
   flex-direction: column;
   justify-content: center;
   padding: 0 12px;
+  background: transparent;
+  color: inherit;
+  text-align: left;
+  border: 0;
   border-bottom: 1px solid var(--border);
   font-size: 12px;
   cursor: pointer;
@@ -300,6 +307,12 @@
   background: var(--hover);
 }
 
+.graph-row:focus-visible {
+  outline: 2px solid var(--accent);
+  outline-offset: -2px;
+  background: var(--hover);
+}
+
 .graph-row-meta {
   display: flex;
   gap: 10px;
@@ -365,6 +378,204 @@
 }
 
 /* ===========================================
+   Changeset Detail
+   =========================================== */
+.changeset-paper {
+  background: var(--bg);
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  padding: 24px;
+}
+
+.changeset-heading,
+.changeset-meta,
+.changeset-parents,
+.changeset-files,
+.changeset-labels {
+  display: flex;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 10px;
+}
+
+.changeset-heading {
+  justify-content: space-between;
+  margin-bottom: 12px;
+}
+
+.changeset-heading code {
+  overflow-wrap: anywhere;
+}
+
+.changeset-paper h2 {
+  margin-bottom: 8px;
+}
+
+.changeset-meta {
+  color: var(--text-secondary);
+  justify-content: space-between;
+  margin-bottom: 16px;
+}
+
+.changeset-branch,
+.changeset-labels span {
+  background: var(--bg-subtle);
+  border: 1px solid var(--border);
+  border-radius: 999px;
+  padding: 2px 8px;
+  font-size: 12px;
+}
+
+.changeset-labels,
+.changeset-parents,
+.changeset-files {
+  margin: 12px 0;
+}
+
+.changeset-parents button {
+  border: 0;
+  background: transparent;
+  color: var(--accent);
+  cursor: pointer;
+  font-family: monospace;
+}
+
+.changeset-parents button:hover {
+  text-decoration: underline;
+}
+
+.changeset-parents button:focus-visible {
+  outline: 2px solid var(--accent);
+  outline-offset: 2px;
+}
+
+.changeset-files code {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  overflow-wrap: anywhere;
+}
+
+.changeset-file-status {
+  color: var(--text-secondary);
+  font-size: 10px;
+  text-transform: uppercase;
+}
+
+.changeset-file-status.status-added {
+  color: var(--success);
+}
+
+.changeset-file-status.status-removed {
+  color: var(--danger);
+}
+
+.changeset-diff {
+  margin-top: 24px;
+}
+
+.changeset-diff h3 {
+  margin-bottom: 10px;
+}
+
+.side-by-side-diff {
+  margin-bottom: 18px;
+  overflow-x: auto;
+  border: 1px solid var(--border);
+  border-radius: 6px;
+  background: var(--bg-code);
+}
+
+.diff-file-header {
+  padding: 9px 12px;
+  border-bottom: 1px solid var(--border);
+  background: var(--bg-subtle);
+  font-family: monospace;
+  font-weight: 600;
+}
+
+.diff-column-headings {
+  display: grid;
+  grid-template-columns: minmax(380px, 1fr) minmax(380px, 1fr);
+  min-width: 760px;
+  border-bottom: 1px solid var(--border);
+  color: var(--text-secondary);
+  font-size: 12px;
+  font-weight: 600;
+  text-transform: uppercase;
+}
+
+.diff-column-headings span {
+  padding: 6px 12px;
+}
+
+.diff-column-headings span + span {
+  border-left: 1px solid var(--border);
+}
+
+.diff-grid {
+  display: grid;
+  grid-template-columns: 52px minmax(328px, 1fr) 52px minmax(328px, 1fr);
+  min-width: 760px;
+  font-family: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo, monospace;
+  font-size: 12px;
+  line-height: 1.5;
+}
+
+.diff-side-number,
+.diff-side-code {
+  min-height: 22px;
+  border-bottom: 1px solid color-mix(in srgb, var(--border) 55%, transparent);
+}
+
+.diff-side-number {
+  padding: 2px 8px;
+  color: var(--text-secondary);
+  text-align: right;
+  user-select: none;
+  border-right: 1px solid var(--border);
+}
+
+.diff-side-code {
+  display: block;
+  margin: 0;
+  padding: 2px 10px;
+  border-radius: 0;
+  background: transparent;
+  white-space: pre;
+}
+
+.diff-column-divider {
+  border-left: 1px solid var(--border);
+}
+
+.diff-add {
+  background: color-mix(in srgb, var(--success) 18%, transparent);
+}
+
+.diff-remove {
+  background: color-mix(in srgb, var(--danger) 18%, transparent);
+}
+
+.diff-empty {
+  background: color-mix(in srgb, var(--bg-subtle) 70%, transparent);
+}
+
+.diff-meta {
+  color: var(--text-secondary);
+  background: var(--bg-subtle);
+}
+
+.diff-range-row {
+  grid-column: 1 / -1;
+  padding: 4px 10px;
+  color: var(--accent);
+  background: var(--bg-subtle);
+  border-bottom: 1px solid var(--border);
+  white-space: pre;
+}
+
+/* ===========================================
    Common States
    =========================================== */
 .empty-state {
@@ -603,11 +814,53 @@
   opacity: 0.7;
 }
 
+.file-viewer-actions {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.file-viewer-actions a {
+  font-size: 13px;
+}
+
 .file-viewer-content {
   overflow: auto;
   flex: 1;
 }
 
+.static-file-viewer {
+  max-width: 1100px;
+}
+
+.static-file-preview {
+  min-height: 240px;
+  padding: 20px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: var(--bg-subtle);
+}
+
+.static-file-image,
+.static-file-video {
+  display: block;
+  max-width: 100%;
+  max-height: 75vh;
+  object-fit: contain;
+}
+
+.static-file-audio {
+  width: min(100%, 640px);
+}
+
+.static-file-pdf {
+  width: 100%;
+  height: 75vh;
+  border: 0;
+  background: #fff;
+}
+
 .file-viewer-content pre {
   margin: 0;
   padding: 16px;