feat(web): add global styles

web/app/globals.css

@@ -0,0 +1,67 @@
+:root {
+  --foreground: #171717;
+  --background: #ffffff;
+  --primary: #0070f3;
+  --error: #e00;
+  --success: #0a0;
+  --warning: #f80;
+}
+
+@media (prefers-color-scheme: dark) {
+  :root {
+    --foreground: #ededed;
+    --background: #0a0a0a;
+  }
+}
+
+* {
+  box-sizing: border-box;
+  padding: 0;
+  margin: 0;
+}
+
+html,
+body {
+  max-width: 100vw;
+  overflow-x: hidden;
+  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
+  background: var(--background);
+  color: var(--foreground);
+}
+
+a {
+  color: var(--primary);
+  text-decoration: none;
+}
+
+a:hover {
+  text-decoration: underline;
+}
+
+button {
+  cursor: pointer;
+  padding: 0.5rem 1rem;
+  border: none;
+  border-radius: 4px;
+  background: var(--primary);
+  color: white;
+  font-size: 1rem;
+}
+
+button:disabled {
+  opacity: 0.6;
+  cursor: not-allowed;
+}
+
+input {
+  padding: 0.5rem;
+  border: 1px solid #ccc;
+  border-radius: 4px;
+  font-size: 1rem;
+}
+
+.container {
+  max-width: 1200px;
+  margin: 0 auto;
+  padding: 1rem;
+}