diff --git a/sidepanel/sidepanel.css b/sidepanel/sidepanel.css
index b627d9d..5a0c33a 100644
--- a/sidepanel/sidepanel.css
+++ b/sidepanel/sidepanel.css
@@ -102,21 +102,77 @@ header {
display: flex;
align-items: center;
gap: 8px;
+ min-width: 0;
+ flex: 1;
}
.header-left svg { color: var(--blue); }
-.header-left h1 {
- font-size: 16px;
+.header-version-block {
+ min-width: 0;
+ display: flex;
+ flex-direction: column;
+ gap: 2px;
+}
+
+.header-version-main {
+ min-width: 0;
+ display: flex;
+ align-items: baseline;
+ gap: 8px;
+}
+
+.header-version-title {
+ font-size: 15px;
font-weight: 700;
letter-spacing: -0.02em;
color: var(--text-primary);
+ min-width: 0;
+ flex: 0 1 auto;
+ white-space: nowrap;
+ overflow: hidden;
+ text-overflow: ellipsis;
+}
+
+.header-version-title.is-version-label { color: var(--blue); }
+.header-version-title.is-update-available { color: var(--orange); }
+.header-version-title.is-check-failed { color: var(--text-primary); }
+
+.header-version-meta {
+ min-width: 0;
+ font-size: 12px;
+ color: var(--text-secondary);
+ white-space: nowrap;
+ overflow: hidden;
+ text-overflow: ellipsis;
+}
+
+.header-version-meta[hidden] {
+ display: none !important;
+}
+
+.header-link-btn {
+ padding: 0;
+ border: none;
+ background: transparent;
+ color: var(--blue);
+ font: inherit;
+ font-size: 12px;
+ font-weight: 600;
+ cursor: pointer;
+ flex-shrink: 0;
+}
+
+.header-link-btn:hover {
+ color: var(--text-primary);
+ text-decoration: underline;
}
.header-btns {
display: flex;
align-items: center;
gap: 4px;
+ flex-shrink: 0;
}
/* ============================================================
@@ -282,6 +338,118 @@ header {
.btn-sm { padding: 5px 12px; font-size: 12px; }
.btn-xs { padding: 4px 10px; font-size: 11px; }
+/* ============================================================
+ Extension Updates
+ ============================================================ */
+
+#update-section { margin-bottom: 14px; }
+
+.update-card {
+ background: var(--bg-surface);
+ border: 1px solid var(--border);
+ border-radius: var(--radius-md);
+ padding: 12px 14px;
+ display: flex;
+ flex-direction: column;
+ gap: 12px;
+ box-shadow: var(--shadow-sm);
+}
+
+.update-card-header {
+ display: flex;
+ flex-wrap: wrap;
+ align-items: flex-start;
+ justify-content: space-between;
+ gap: 12px;
+}
+
+.update-card-copy {
+ min-width: 0;
+ display: flex;
+ flex-direction: column;
+ gap: 4px;
+}
+
+.update-card-version {
+ font-size: 14px;
+ font-weight: 700;
+ color: var(--orange);
+}
+
+.update-card-summary {
+ font-size: 12px;
+ color: var(--text-secondary);
+ line-height: 1.6;
+}
+
+.update-release-list {
+ display: flex;
+ flex-direction: column;
+ gap: 10px;
+}
+
+.update-release-item {
+ padding-top: 10px;
+ border-top: 1px solid var(--border-subtle);
+}
+
+.update-release-item:first-child {
+ padding-top: 0;
+ border-top: none;
+}
+
+.update-release-head {
+ display: flex;
+ justify-content: space-between;
+ align-items: baseline;
+ gap: 8px;
+ margin-bottom: 6px;
+}
+
+.update-release-title-row {
+ display: flex;
+ align-items: baseline;
+ gap: 8px;
+ min-width: 0;
+}
+
+.update-release-version {
+ font-size: 13px;
+ font-weight: 700;
+ color: var(--text-primary);
+}
+
+.update-release-name {
+ min-width: 0;
+ font-size: 12px;
+ color: var(--text-secondary);
+ white-space: nowrap;
+ overflow: hidden;
+ text-overflow: ellipsis;
+}
+
+.update-release-date {
+ flex-shrink: 0;
+ font-family: 'JetBrains Mono', 'Consolas', monospace;
+ font-size: 11px;
+ color: var(--text-muted);
+}
+
+.update-release-notes {
+ margin: 0;
+ padding-left: 18px;
+ color: var(--text-secondary);
+ font-size: 12px;
+ line-height: 1.55;
+}
+
+.update-release-notes li + li { margin-top: 4px; }
+
+.update-release-empty {
+ font-size: 12px;
+ color: var(--text-muted);
+}
+
/* ============================================================
Data Card
============================================================ */
diff --git a/sidepanel/sidepanel.html b/sidepanel/sidepanel.html
index e698e2d..a5d9db6 100644
--- a/sidepanel/sidepanel.html
+++ b/sidepanel/sidepanel.html
@@ -20,7 +20,13 @@
stroke-linecap="round" stroke-linejoin="round">