feat(udt-001): frontend auth UI (Zustand store, TanStack Query, LoginPage, router)

src/web/src/index.css

@@ -0,0 +1,81 @@
+@import "tailwindcss";
+
+@media (prefers-color-scheme: dark) {
+  :root {
+    --text: #9ca3af;
+    --text-h: #f3f4f6;
+    --bg: #16171d;
+    --border: #2e303a;
+    --code-bg: #1f2028;
+    --accent: #c084fc;
+    --accent-bg: rgba(192, 132, 252, 0.15);
+    --accent-border: rgba(192, 132, 252, 0.5);
+    --social-bg: rgba(47, 48, 58, 0.5);
+    --shadow:
+      rgba(0, 0, 0, 0.4) 0 10px 15px -3px, rgba(0, 0, 0, 0.25) 0 4px 6px -2px;
+  }
+
+  #social .button-icon {
+    filter: invert(1) brightness(2);
+  }
+}
+
+#root {
+  width: 1126px;
+  max-width: 100%;
+  margin: 0 auto;
+  text-align: center;
+  border-inline: 1px solid var(--border);
+  min-height: 100svh;
+  display: flex;
+  flex-direction: column;
+  box-sizing: border-box;
+}
+
+body {
+  margin: 0;
+}
+
+h1,
+h2 {
+  font-family: var(--heading);
+  font-weight: 500;
+  color: var(--text-h);
+}
+
+h1 {
+  font-size: 56px;
+  letter-spacing: -1.68px;
+  margin: 32px 0;
+  @media (max-width: 1024px) {
+    font-size: 36px;
+    margin: 20px 0;
+  }
+}
+h2 {
+  font-size: 24px;
+  line-height: 118%;
+  letter-spacing: -0.24px;
+  margin: 0 0 8px;
+  @media (max-width: 1024px) {
+    font-size: 20px;
+  }
+}
+p {
+  margin: 0;
+}
+
+code,
+.counter {
+  font-family: var(--mono);
+  display: inline-flex;
+  border-radius: 4px;
+  color: var(--text-h);
+}
+
+code {
+  font-size: 15px;
+  line-height: 135%;
+  padding: 4px 8px;
+  background: var(--code-bg);
+}