Refine shared header language selector

app/static/css/language.css

@@ -1,32 +1,80 @@
-/* Persistent language choice, also available before login. */
-.language-switch {
+/* Shared language/account controls, including pages shown before login. */
+.header-controls {
+    position: relative;
+    z-index: 2000;
+    display: flex;
+    flex-wrap: nowrap;
+    align-items: center;
+    justify-content: flex-end;
+    gap: 6px;
+    min-width: 0;
+    max-width: 100%;
+    margin-left: auto;
+}
+.language-switch { position: relative; flex: 0 0 auto; margin: 0; padding: 0; }
+.language-switch > summary {
     display: flex;
     align-items: center;
     justify-content: center;
-    flex: 0 0 auto;
-    margin: 0;
-    padding: 0;
+    gap: 5px;
+    min-height: 44px;
+    padding: 6px 8px;
+    border: 1px solid transparent;
+    border-radius: 9px;
+    color: var(--muted, #57534e);
+    background: transparent;
+    font: 500 .85rem/1.2 system-ui, sans-serif;
+    white-space: nowrap;
+    cursor: pointer;
+    list-style: none;
 }
-.language-switch a {
-    display: inline-flex;
-    align-items: center;
-    justify-content: center;
-    width: 38px;
-    height: 36px;
-    border: 1px solid var(--border, #30363d);
-    border-radius: 8px;
-    color: var(--text, #222);
-    font-family: system-ui, sans-serif;
-    font-size: 1.2rem;
-    line-height: 1;
-    text-decoration: none;
+.language-switch > summary::-webkit-details-marker { display: none; }
+.language-caret { font-size: .7rem; }
+.language-switch[open] > summary,
+.language-switch > summary:active { color: var(--text, #f5f5f4); background: var(--surface-hover, #1a1111); border-color: var(--border, #3a3030); }
+.language-panel {
+    position: absolute;
+    top: calc(100% + 6px);
+    right: 0;
+    z-index: 10000;
+    width: 200px;
+    max-width: calc(100vw - 24px);
+    padding: 6px;
+    border: 1px solid var(--border, #3a3030);
+    border-radius: 10px;
+    color: var(--text, #f5f5f4);
+    background: var(--surface, #101010);
+    box-shadow: 0 14px 35px rgba(0,0,0,.65);
 }
-.language-switch a.active { background: #922525; color: #fff; border-color: #c74747; }
-.language-switch a:focus-visible { outline: 2px solid #fff; outline-offset: 3px; }
-.language-switch a:hover { background: #7f1d1d; }
-.header-controls { display: flex; align-items: center; justify-content: flex-end; gap: 6px; margin-left: auto; }
-.header-controls .user-menu { margin-left: 0; }
+.language-heading { margin: 0; padding: 8px 10px; font-size: .8rem; color: var(--muted, #a8a29e); }
+.language-panel a { display: flex; align-items: center; gap: 10px; min-height: 44px; padding: 8px 10px; border-radius: 6px; color: inherit; font: 400 .9rem/1.3 system-ui, sans-serif; text-decoration: none; }
+.language-panel a[aria-current] { background: var(--surface-hover, #1a1111); font-weight: 700; }
+.language-selected { margin-left: auto; }
+.language-switch summary:focus-visible { outline: 2px solid var(--text, #57534e); outline-offset: 2px; }
+.language-panel a:focus-visible,
+.header-controls .user-menu summary:focus-visible { outline: 2px solid var(--text, #f5f5f4); outline-offset: 2px; }
+@media (hover: hover) {
+    .language-switch > summary:hover { color: var(--text, #f5f5f4); background: var(--surface-hover, #1a1111); border-color: var(--border, #3a3030); }
+    .language-panel a:hover { background: var(--surface-hover, #1a1111); }
+}
+/* Both menus anchor to the same right edge, independent of the page header. */
+.header-controls .language-switch,
+.header-controls .user-menu { position: static; margin-left: 0; }
+.header-controls .user-menu { min-width: 0; }
+.header-controls .user-menu summary { display: flex; align-items: center; gap: 5px; min-height: 44px; max-width: 220px; }
+.user-menu-name { min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.header-controls .metal-notification { flex-shrink: 0; margin-right: 7px; }
+.header-controls .user-menu-panel { position: absolute; top: calc(100% + 6px); right: 0; max-width: calc(100vw - 24px); max-height: calc(100dvh - 90px); overflow-y: auto; }
+.header-inner { gap: 8px; }
+.header-inner > .logo { min-width: 0; flex-shrink: 1; }
+.header-inner > .logo .brand-logo { max-width: 100% !important; }
 .header-inner > .language-switch { margin-left: auto; }
-.header-actions > .header-controls { flex: 0 0 auto; }
-.detail-topbar > .header-controls { flex: 0 0 auto; }
+.detail-topbar { align-items: center; padding-inline: 12px; }
+.detail-topbar > .back-link { min-width: 0; overflow-wrap: anywhere; }
+.detail-topbar > .header-controls { flex-shrink: 0; }
 .registration-header { display: flex; justify-content: flex-end; margin: -36px 0 12px; }
+@media (max-width: 600px) {
+    .header-controls .user-menu summary { max-width: 30vw; padding: 8px; }
+    .language-switch > summary { padding: 6px; }
+    .detail-topbar { gap: 8px; }
+}