feat: Add web localization

web/src/styles.css

@@ -60,6 +60,49 @@ textarea {
   overflow: hidden;
 }
 
+.language-switcher {
+  position: absolute;
+  top: 20px;
+  right: 20px;
+  z-index: 3;
+  display: inline-flex;
+  gap: 6px;
+  padding: 6px;
+  border: 1px solid rgba(115, 88, 58, 0.18);
+  border-radius: 999px;
+  background: rgba(255, 251, 244, 0.92);
+  box-shadow: 0 12px 24px rgba(99, 73, 45, 0.08);
+}
+
+.language-button {
+  min-width: 52px;
+  padding: 10px 12px;
+  border: 0;
+  border-radius: 999px;
+  background: transparent;
+  color: var(--muted);
+  font-family: "IBM Plex Mono", monospace;
+  font-size: 0.82rem;
+  font-weight: 600;
+  letter-spacing: 0.08em;
+  cursor: pointer;
+  transition:
+    background 160ms ease,
+    color 160ms ease,
+    transform 160ms ease;
+}
+
+.language-button:hover {
+  transform: translateY(-1px);
+  color: var(--ink);
+}
+
+.language-button.is-active {
+  background: linear-gradient(180deg, var(--accent), var(--accent-strong));
+  color: #fff8f2;
+  box-shadow: 0 10px 20px rgba(202, 67, 27, 0.22);
+}
+
 .page-noise {
   position: absolute;
   inset: 0;
@@ -645,6 +688,10 @@ textarea {
 }
 
 @media (max-width: 1080px) {
+  .app-shell {
+    padding-top: 88px;
+  }
+
   .hero,
   .layout {
     grid-template-columns: 1fr;
@@ -661,10 +708,20 @@ textarea {
   .app-shell {
     width: calc(100% - 16px);
     margin: 8px auto;
-    padding: 16px;
+    padding: 84px 16px 16px;
     border-radius: 24px;
   }
 
+  .language-switcher {
+    top: 14px;
+    right: 14px;
+  }
+
+  .language-button {
+    min-width: 48px;
+    padding: 9px 10px;
+  }
+
   .hero-mark {
     align-items: flex-start;
   }