add terms acceptance step before invoice, enter key submit, fix link display

index.html

@@ -136,6 +136,7 @@ tbody tr:hover{background:color-mix(in srgb,var(--accent-soft) 50%,transparent)}
   background:var(--accent);color:#fff;
 }
 .btn:hover{filter:brightness(1.06)}
+.btn:disabled{opacity:.45;cursor:not-allowed;filter:none}
 .note{font-size:13px;color:var(--muted);margin-top:16px;line-height:1.55}
 .note strong{color:var(--ink)}
 
@@ -149,8 +150,12 @@ tbody tr:hover{background:color-mix(in srgb,var(--accent-soft) 50%,transparent)}
 #qrcode img{width:160px;height:160px}
 .ok-line{color:var(--ok);font-weight:600;font-size:14px;margin-bottom:14px}
 .err-line{color:#d32f2f;font-weight:600;font-size:14px;margin-bottom:14px}
-.flag-ok{color:var(--ok);font-weight:600;font-size:13px}
+.terms-box{display:none;margin:16px 0;padding:20px;background:var(--panel);border:1px solid var(--line);border-radius:var(--radius)}
-.flag-err{color:#d32f2f;font-weight:600;font-size:13px}
+.terms-box.show{display:block}
+.terms-box .lead{margin:0 0 12px;color:var(--ink);font-weight:600}
+.terms-box a.mono{font-size:14px;word-break:break-all}
+.terms-box label{font-size:14px;cursor:pointer}
+.terms-box .btn{margin-top:14px}
 
 .intro-card{
   background:var(--panel);border:1px solid var(--line);
@@ -275,6 +280,19 @@ footer a{color:var(--accent);text-decoration:none}
 
         <div class="ok-line" id="iv-status"></div>
 
+        <div class="terms-box" id="terms-box">
+          <p class="lead">You are about to add this server:</p>
+          <p><a id="terms-url" href="#" target="_blank" rel="noopener" class="mono"></a></p>
+          <p style="font-size:13px;margin-top:4px"><strong>Make sure the link above works correctly before paying. No refunds or URL changes after payment.</strong></p>
+          <p style="font-size:14px">
+            <label>
+              <input type="checkbox" id="terms-check">
+              I accept the <a href="/terms.html" target="_blank">terms and conditions</a>
+            </label>
+          </p>
+          <button class="btn" id="terms-accept" disabled>Accept & Show Invoice</button>
+        </div>
+
         <div class="invoice" id="invoice">
           <div class="row"><span>Minimum amount</span><span id="iv-min">—</span></div>
           <div class="row"><span>Chain</span><span id="iv-chain">—</span></div>
@@ -287,8 +305,6 @@ footer a{color:var(--accent);text-decoration:none}
 
         <p class="note">
           <strong>Please make sure your server is online before you attempt to add it.</strong>
-          Servers that are offline will not appear in this list. They will be checked regularly
-          until they come back online.
         </p>
       </div>
 
@@ -461,6 +477,9 @@ document.getElementById('submit').addEventListener('click', async () => {
   document.getElementById('iv-status2').textContent = '—';
   document.getElementById('iv-url').textContent = '—';
   document.getElementById('qrcode').innerHTML = '';
+  document.getElementById('terms-box').classList.remove('show');
+  document.getElementById('terms-check').checked = false;
+  document.getElementById('terms-accept').disabled = true;
   const chain = getChain();
   try {
     const response = await fetch('/data', {
@@ -485,15 +504,34 @@ document.getElementById('submit').addEventListener('click', async () => {
     const qrEl = document.getElementById('qrcode');
     qrEl.innerHTML = '';
     new QRCode(qrEl, invoiceuri);
-    inv.classList.add('show');
+    const serverUrl = result.url || url;
-    inv.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
+    const infoUrl = serverUrl + '/' + (result.chain || chain) + '/info';
-    document.getElementById('iv-url').textContent = result.url || url;
+    document.getElementById('iv-url').textContent = serverUrl;
+    document.getElementById('terms-url').href = infoUrl;
+    document.getElementById('terms-url').textContent = serverUrl;
+    document.getElementById('terms-box').classList.add('show');
+    document.getElementById('terms-box').scrollIntoView({ behavior: 'smooth', block: 'nearest' });
   } catch (err) {
     document.getElementById('iv-status').className = 'err-line';
     document.getElementById('iv-status').textContent = 'Network error. Please try again.';
   }
 });
 
+document.getElementById('terms-check').addEventListener('change', function () {
+  document.getElementById('terms-accept').disabled = !this.checked;
+});
+
+document.getElementById('terms-accept').addEventListener('click', function () {
+  document.getElementById('terms-box').classList.remove('show');
+  const inv = document.getElementById('invoice');
+  inv.classList.add('show');
+  inv.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
+});
+
+document.getElementById('url').addEventListener('keydown', e => {
+  if (e.key === 'Enter') document.getElementById('submit').click();
+});
+
 (function init() {
   const blob = new Blob([JSON.stringify(allServers, null, 2)], { type: 'application/json' });
   document.getElementById('download').href = URL.createObjectURL(blob);