New logo, starting account handling

assets/common.css

@@ -71,4 +71,33 @@
 {
     margin-left: 1.2em;
     margin-right: 1.2em;
+}
+
+html.dark-mode .dark-hidden {
+    display: none;
+}
+
+html.dark-mode .dark-block {
+    display: block;
+}
+
+html.light-mode .light-hidden {
+    display: none;
+}
+
+html.light-mode .light-block {
+    display: block;
+}
+
+.flex {
+    display: flex;
+}
+.align-baseline {
+    align-items: baseline;
+}
+.align-center {
+    align-items: center;
+}
+.align-stretch {
+    align-items: stretch;
 }

assets/global.css

@@ -4079,15 +4079,6 @@ body {
     color: var(--text-muted);
 }
 
-.not-found-image {
-    display: block;
-    background-image: url(/public/images/10a4c7dfa70cedab4d48.png);
-    width: 103px;
-    height: 132px;
-    background-size: 103px 132px;
-    margin-bottom: 12px;
-}
-
 /* Outline view */
 .outline-view-outer {
     width: 100%;
@@ -4293,6 +4284,9 @@ body {
     font-weight: var(--site-name-weight);
     flex: 1 0 0;
     text-decoration: none;
+    position: relative;
+    display: flex;
+    align-items: center;
 }
 
 .site-nav-bar-text:hover {
@@ -4984,7 +4978,20 @@ body {
     justify-content: end;
 }
 
-.site-nav-bar-text.mod-active {
-    padding-bottom: .5em;
-    border-bottom: 3px solid var(--nav-item-border-color-active);
+.site-nav-bar-text.mod-active:after {
+    content: "";
+    background-color: var(--nav-item-border-color-active);
+    height: 3px;
+    position: absolute;
+    left: 0;
+    right: 0;
+    bottom: calc(-0.5em + 2px);
+}
+
+.site-login {
+    cursor: pointer;
+}
+
+.site-login:hover {
+    opacity: 0.7;
 }