Add profile photo uploads and custom difficulty support

app/globals.css

@@ -801,7 +801,7 @@ nav a:hover,
 }
 .difficulty-options {
   display: grid;
-  grid-template-columns: repeat(3, 1fr);
+  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
   gap: 10px;
   margin: 25px 0;
 }
@@ -829,6 +829,51 @@ nav a:hover,
   font-size: 10px;
   margin-top: 5px;
 }
+.difficulty-library {
+  margin: -12px 0 24px;
+}
+.difficulty-builder {
+  display: grid;
+  gap: 10px;
+  max-width: 430px;
+  margin-top: 12px;
+  padding: 18px;
+  border: 1px solid var(--line);
+  background: #0d160f;
+}
+.difficulty-builder label {
+  color: var(--muted);
+  font-size: 12px;
+}
+.difficulty-builder > input,
+.difficulty-builder-time input {
+  min-height: 42px;
+  padding: 9px 11px;
+  border: 1px solid #34452e;
+  background: var(--panel);
+  color: var(--text);
+  font: inherit;
+}
+.difficulty-builder-time {
+  display: flex;
+  align-items: center;
+  gap: 9px;
+}
+.difficulty-builder-time input {
+  width: 120px;
+}
+.difficulty-builder-time span {
+  color: var(--muted);
+  font-size: 12px;
+}
+.difficulty-builder .difficulty-builder-zoom {
+  display: flex;
+  align-items: center;
+  gap: 9px;
+}
+.difficulty-builder-zoom input {
+  accent-color: var(--green);
+}
 .prose {
   max-width: 850px;
 }