diff --git a/src/index.html b/src/index.html
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+++ b/src/index.html
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+<!DOCTYPE html>
+<html lang="en" class="dark">
+  <head>
+    <meta charset="UTF-8" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Nostr Tip Jar</title>
+
+    <!-- TailwindCSS (Play CDN for demo) -->
+    <script src="https://cdn.tailwindcss.com"></script>
+
+    <!-- QRCode generator -->
+    <script src="https://cdnjs.cloudflare.com/ajax/libs/qrcodejs/1.0.0/qrcode.min.js"></script>
+
+    <style>
+      :root { --accent-purple: #a855f7; --accent-orange: #f97316; }
+      body {
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        min-height: 100vh;
+        margin: 0;
+      }
+      .accent-gradient {
+        background: linear-gradient(90deg, var(--accent-purple), var(--accent-orange));
+        -webkit-background-clip: text;
+        -webkit-text-fill-color: transparent;
+      }
+    </style>
+  </head>
+
+  <body class="bg-gray-900 text-gray-200">
+    <main id="app" class="w-full max-w-sm p-6 space-y-6 text-center"></main>
+
+    <script type="module">
+      import { nip19, SimplePool } from "https://esm.sh/nostr-tools@1.7.5?bundle";
+
+      const RELAYS = [
+        "wss://relay.damus.io",
+        "wss://nos.lol",
+        "wss://relay.snort.social",
+        "wss://relay.primal.net",
+        "wss://relay.nostr.band",
+      ];
+      const TIMEOUT_MS = 8000;
+
+      const log = (...a) => console.log("[tipjar]", ...a);
+      const warn = (...a) => console.warn("[tipjar]", ...a);
+      const error = (...a) => console.error("[tipjar]", ...a);
+      window.addEventListener("error", e => error("Uncaught:", e.message));
+      window.addEventListener("unhandledrejection", e => error("Promise rejection:", e.reason));
+
+      init();
+
+      function init() {
+        const { npub, base } = parseUrl();
+        if (!npub) return renderLanding(base);
+        if (!npub.startsWith("npub")) return renderLanding(base, "Invalid npub provided.");
+        renderTipJar(npub);
+      }
+
+      function parseUrl() {
+        const parts = location.pathname.split("/").filter(Boolean);
+        let npub = null;
+        if (parts[0] === "n" && parts[1]) npub = parts[1];
+        else npub = new URLSearchParams(location.search).get("n");
+        const idx = location.pathname.indexOf("/n/");
+        const base = idx > 0 ? location.pathname.slice(0, idx) : location.pathname;
+        return { npub, base };
+      }
+
+      function renderLanding(base, msg = '') {
+        document.getElementById('app').innerHTML = `
+          <div class="space-y-6">
+            <h1 class="text-3xl font-extrabold accent-gradient">Lightning Tip Jar</h1>
+            <p class="text-gray-400">Enter a Nostr <span class="font-mono">npub…</span> to create a tipping page.</p>
+            ${msg ? `<p class='text-red-500'>${msg}</p>` : ''}
+            <form id="form" class="space-y-4">
+              <input id="input" type="text" placeholder="npub1…" required class="w-full px-4 py-2 rounded-lg bg-gray-800 text-gray-200 placeholder-gray-500 focus:outline-none focus:ring-2 focus:ring-purple-600" />
+              <button class="w-full py-2 rounded-lg bg-gradient-to-r from-purple-600 to-orange-500 text-white font-semibold transition active:scale-95" type="submit">Generate</button>
+            </form>
+            <footer class="text-xs text-gray-500">Client-side • No servers • Lightning ⚡</footer>
+          </div>`;
+        document.getElementById('form').onsubmit = e => {
+          e.preventDefault();
+          const v = document.getElementById('input').value.trim();
+          if (!v.startsWith('npub')) return renderLanding(base, 'npub must start with "npub".');
+          const isFile = /\.html?$/.test(base);
+          location.href = isFile ? `${base}?n=${v}` : `${base.replace(/\/$/, '')}/n/${v}`;
+        };
+      }
+
+      async function renderTipJar(npub) {
+        const app = document.getElementById('app');
+        app.innerHTML = `
+          <img id="avatar" class="w-24 h-24 rounded-full mx-auto hidden" alt="Avatar" />
+          <h1 id="name" class="text-2xl font-extrabold accent-gradient mb-2">Loading…</h1>
+          <p id="about" class="text-sm text-gray-400"></p>
+          <div id="qrcode" class="mx-auto bg-white p-4 rounded-xl inline-block"></div>
+          <p id="addr" class="break-all font-mono text-lg"></p>
+          <button id="copy" class="w-full py-2 rounded-lg bg-gradient-to-r from-purple-600 to-orange-500 text-white font-semibold transition active:scale-95">Copy Address</button>`;
+
+        let hex;
+        try {
+          const dec = nip19.decode(npub);
+          hex = dec.data;
+          log('Decoded hex pubkey', hex);
+        } catch {
+          return fatal(app, 'Bad npub format');
+        }
+
+        const fallback = `${npub}@npub.cash`;
+        let meta = null, ln = fallback;
+
+        const pool = new SimplePool();
+        const sub = pool.sub(RELAYS, [{ kinds: [0], authors: [hex], limit: 1 }]);
+        const timer = setTimeout(() => { warn('Relay timeout'); finalize(); }, TIMEOUT_MS);
+
+        sub.on('event', ev => {
+          clearTimeout(timer);
+          try {
+            meta = JSON.parse(ev.content || '{}');
+            ln = meta.lud16 || meta.lud06 || fallback;
+            log('Profile metadata', meta);
+          } catch (e) {
+            error('Failed to parse metadata JSON', e);
+          }
+          finalize();
+        });
+        sub.on('eose', () => warn('EOSE reached, no event'));
+
+        function finalize() {
+          try { sub.unsub(); pool.close(); } catch {};
+          buildUI(app, meta, ln);
+        }
+
+        function fatal(container, msg) {
+          container.innerHTML = `<p class='text-red-500'>${msg}</p>`;
+        }
+      }
+
+      function buildUI(app, meta, ln) {
+        document.getElementById('name').textContent = meta?.name || 'Lightning Tip Jar';
+        if (meta?.about) document.getElementById('about').textContent = meta.about;
+        if (meta?.picture) {
+          const img = document.getElementById('avatar');
+          img.src = meta.picture;
+          img.classList.remove('hidden');
+        }
+        if (!meta?.lud16 && !meta?.lud06) {
+          const about = document.getElementById('about');
+          about.textContent += ' (using fallback address)';
+        }
+        document.getElementById('addr').textContent = ln;
+        const qrEl = document.getElementById('qrcode');
+        qrEl.innerHTML = '';
+        new QRCode(qrEl, { text: ln, width: 200, height: 200, colorDark: '#111', colorLight: '#fff' });
+        document.getElementById('copy').onclick = () => {
+          navigator.clipboard.writeText(ln).then(() => {
+            const btn = document.getElementById('copy');
+            const old = btn.textContent;
+            btn.textContent = 'Copied!';
+            setTimeout(() => btn.textContent = old, 1200);
+          });
+        };
+      }
+    </script>
+  </body>
+</html>
