diff --git a/renderer/app.css b/renderer/app.css
index ca61885..b9170a6 100644
--- a/renderer/app.css
+++ b/renderer/app.css
@@ -1,28 +1,29 @@
-/* Neon / terminal "hackertyper" theme.
+/* Neon / terminal "hackertyper" theme — electric-blue variant.
    Dense, operator-oriented UI — no framework, hand-tuned CSS.
    Class names are load-bearing (HTML + renderer/app.js reference them);
    this file only restyles, it doesn't rename anything. */
 
 :root {
-  /* Near-black base, faintly green-shifted like a phosphor display. */
-  --bg: #03070a;
-  --bg-elev: #070d12;
-  --bg-elev-2: #0c151c;
+  /* Blue-black base, like a cold CRT. */
+  --bg: #02050c;
+  --bg-elev: #060c16;
+  --bg-elev-2: #0b1422;
 
-  /* Phosphor-tinted text. */
-  --fg: #d7f7ea;
-  --fg-dim: #6f9b8e;
-  --border: #123026;
+  /* Blue-white text. */
+  --fg: #d6ecff;
+  --fg-dim: #6f90b5;
+  --border: #163457;
 
-  /* Neon accents. */
-  --neon: #00ffa3;          /* primary — terminal green/cyan */
-  --neon-soft: #19f9d8;
-  --cyan: #38e1ff;
+  /* Neon accents — blue-forward. */
+  --neon: #21c8ff;          /* primary — electric blue/cyan */
+  --neon-soft: #7ce0ff;
+  --cyan: #46e6ff;
+  --blue: #2a7bff;
   --magenta: #ff3df0;
 
   --accent: var(--neon);
   --accent-hover: var(--neon-soft);
-  --ok: #2bff88;
+  --ok: #2bff9e;            /* health "ok" stays green — it's semantic */
   --warn: #ffc44d;
   --danger: #ff3b6b;
   --danger-hover: #ff5d85;
@@ -30,11 +31,11 @@
 
   --mono: "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
 
-  /* Reusable glow shadows. */
-  --glow-neon: 0 0 6px rgba(0, 255, 163, 0.55);
-  --glow-neon-strong: 0 0 10px rgba(0, 255, 163, 0.7), 0 0 22px rgba(0, 255, 163, 0.35);
-  --glow-danger: 0 0 8px rgba(255, 59, 107, 0.6);
-  --glow-cyan: 0 0 8px rgba(56, 225, 255, 0.55);
+  /* Reusable glow shadows — turned up. */
+  --glow-neon: 0 0 8px rgba(33, 200, 255, 0.65);
+  --glow-neon-strong: 0 0 12px rgba(33, 200, 255, 0.85), 0 0 30px rgba(33, 200, 255, 0.5), 0 0 56px rgba(33, 200, 255, 0.22);
+  --glow-danger: 0 0 10px rgba(255, 59, 107, 0.7), 0 0 24px rgba(255, 59, 107, 0.35);
+  --glow-cyan: 0 0 10px rgba(70, 230, 255, 0.6);
 }
 
 * { box-sizing: border-box; }
@@ -51,11 +52,12 @@ html, body {
   line-height: 1.45;
 }
 
-/* Ambient phosphor vignette behind everything. */
+/* Ambient neon vignette behind everything. */
 body {
   background:
-    radial-gradient(1200px 600px at 50% -10%, rgba(0, 255, 163, 0.08), transparent 60%),
-    radial-gradient(900px 500px at 100% 110%, rgba(56, 225, 255, 0.06), transparent 60%),
+    radial-gradient(1200px 600px at 50% -10%, rgba(33, 200, 255, 0.12), transparent 60%),
+    radial-gradient(900px 520px at 100% 110%, rgba(42, 123, 255, 0.1), transparent 60%),
+    radial-gradient(700px 400px at 0% 100%, rgba(70, 230, 255, 0.07), transparent 60%),
     var(--bg);
 }
 
@@ -70,7 +72,7 @@ body::after {
     to bottom,
     rgba(0, 0, 0, 0) 0px,
     rgba(0, 0, 0, 0) 2px,
-    rgba(0, 0, 0, 0.18) 3px,
+    rgba(0, 0, 0, 0.16) 3px,
     rgba(0, 0, 0, 0) 4px
   );
   mix-blend-mode: multiply;
@@ -83,17 +85,17 @@ body::after {
   99% { opacity: 0.42; }
 }
 
-::selection { background: rgba(0, 255, 163, 0.28); color: #fff; text-shadow: none; }
+::selection { background: rgba(33, 200, 255, 0.32); color: #fff; text-shadow: none; }
 
 /* Neon scrollbars (WebKit / Chromium — Electron). */
 ::-webkit-scrollbar { width: 10px; height: 10px; }
 ::-webkit-scrollbar-track { background: var(--bg-elev); }
 ::-webkit-scrollbar-thumb {
-  background: #0f3a2c;
+  background: #14385c;
   border-radius: 6px;
   border: 1px solid var(--border);
 }
-::-webkit-scrollbar-thumb:hover { background: #135a44; box-shadow: var(--glow-neon); }
+::-webkit-scrollbar-thumb:hover { background: #1c5d92; box-shadow: var(--glow-neon); }
 
 code {
   font-family: var(--mono);
@@ -116,9 +118,9 @@ code {
   align-items: center;
   gap: 16px;
   padding: 10px 16px;
-  background: linear-gradient(180deg, rgba(0, 255, 163, 0.05), transparent), var(--bg-elev);
-  border-bottom: 1px solid var(--border);
-  box-shadow: 0 1px 0 rgba(0, 255, 163, 0.15), 0 6px 18px -10px rgba(0, 255, 163, 0.3);
+  background: linear-gradient(180deg, rgba(33, 200, 255, 0.08), transparent), var(--bg-elev);
+  border-bottom: 1px solid var(--neon);
+  box-shadow: 0 1px 0 rgba(33, 200, 255, 0.3), 0 8px 24px -10px rgba(33, 200, 255, 0.5);
 }
 .topbar .brand {
   font-weight: 700;
@@ -128,7 +130,7 @@ code {
   text-shadow: var(--glow-neon-strong);
   animation: brandflicker 4.5s infinite;
 }
-.topbar .brand::before { content: "▌ "; color: var(--neon); opacity: 0.8; }
+.topbar .brand::before { content: "▌ "; color: var(--neon); opacity: 0.85; }
 @keyframes brandflicker {
   0%, 19%, 21%, 55%, 57%, 100% { opacity: 1; text-shadow: var(--glow-neon-strong); }
   20% { opacity: 0.7; }
@@ -148,9 +150,9 @@ code {
   display: flex;
   flex-direction: column;
   gap: 12px;
-  box-shadow: var(--glow-neon-strong), inset 0 0 30px rgba(0, 255, 163, 0.05);
+  box-shadow: var(--glow-neon-strong), inset 0 0 40px rgba(33, 200, 255, 0.07);
 }
-.card h1 { margin: 0 0 4px; font-size: 18px; color: var(--neon); text-shadow: var(--glow-neon); letter-spacing: 1px; }
+.card h1 { margin: 0 0 4px; font-size: 18px; color: var(--neon); text-shadow: var(--glow-neon-strong); letter-spacing: 1px; }
 .card p { margin: 0 0 8px; }
 
 label {
@@ -177,10 +179,10 @@ select {
   outline: none;
   transition: border-color 0.12s ease, box-shadow 0.12s ease;
 }
-input::placeholder { color: #3f5e54; }
+input::placeholder { color: #43607f; }
 input:focus, select:focus {
   border-color: var(--neon);
-  box-shadow: var(--glow-neon), inset 0 0 8px rgba(0, 255, 163, 0.12);
+  box-shadow: var(--glow-neon), inset 0 0 10px rgba(33, 200, 255, 0.15);
   caret-color: var(--neon);
 }
 /* Glowing checkbox accent. */
@@ -202,18 +204,17 @@ button:hover:not(:disabled) { border-color: var(--neon); color: var(--neon); box
 button:disabled { opacity: 0.4; cursor: not-allowed; }
 
 button.primary {
-  background: rgba(0, 255, 163, 0.1);
+  background: rgba(33, 200, 255, 0.12);
   color: var(--neon);
   border-color: var(--neon);
   font-weight: 700;
   text-transform: uppercase;
   text-shadow: var(--glow-neon);
-  box-shadow: var(--glow-neon), inset 0 0 10px rgba(0, 255, 163, 0.12);
+  box-shadow: var(--glow-neon), inset 0 0 12px rgba(33, 200, 255, 0.15);
 }
 button.primary:hover:not(:disabled) {
-  background: rgba(0, 255, 163, 0.18);
-  color: #002a1c;
-  background-color: var(--neon);
+  background: var(--neon);
+  color: #00121f;
   box-shadow: var(--glow-neon-strong);
   text-shadow: none;
 }
@@ -221,19 +222,19 @@ button.ghost { background: transparent; }
 button.ghost:hover:not(:disabled) { border-color: var(--cyan); color: var(--cyan); box-shadow: var(--glow-cyan); }
 
 button.danger {
-  background: rgba(255, 59, 107, 0.12);
+  background: rgba(255, 59, 107, 0.14);
   color: var(--danger);
   border-color: var(--danger);
   font-weight: 700;
   text-transform: uppercase;
   text-shadow: var(--glow-danger);
-  box-shadow: var(--glow-danger), inset 0 0 10px rgba(255, 59, 107, 0.12);
+  box-shadow: var(--glow-danger), inset 0 0 12px rgba(255, 59, 107, 0.14);
 }
 button.danger:hover:not(:disabled) {
   background: var(--danger);
   color: #1a0008;
   border-color: var(--danger-hover);
-  box-shadow: 0 0 12px rgba(255, 59, 107, 0.8), 0 0 26px rgba(255, 59, 107, 0.4);
+  box-shadow: 0 0 14px rgba(255, 59, 107, 0.85), 0 0 30px rgba(255, 59, 107, 0.45);
   text-shadow: none;
 }
 
@@ -241,7 +242,7 @@ button.danger:hover:not(:disabled) {
   width: 320px;
   padding: 16px;
   border-right: 1px solid var(--border);
-  background: linear-gradient(180deg, rgba(0, 255, 163, 0.03), transparent 240px), var(--bg-elev);
+  background: linear-gradient(180deg, rgba(33, 200, 255, 0.05), transparent 260px), var(--bg-elev);
   overflow-y: auto;
   display: flex;
   flex-direction: column;
@@ -287,7 +288,7 @@ button.danger:hover:not(:disabled) {
   overflow: auto;
   border: 1px solid var(--border);
   border-radius: 4px;
-  box-shadow: inset 0 0 24px rgba(0, 255, 163, 0.04);
+  box-shadow: inset 0 0 30px rgba(33, 200, 255, 0.05);
 }
 .fleet-table {
   width: 100%;
@@ -318,14 +319,14 @@ button.danger:hover:not(:disabled) {
   text-overflow: ellipsis;
   max-width: 320px;
 }
-.fleet-table tbody tr:hover { background: rgba(0, 255, 163, 0.06); }
+.fleet-table tbody tr:hover { background: rgba(33, 200, 255, 0.08); }
 .fleet-table tbody tr.selected {
-  background: rgba(0, 255, 163, 0.12);
-  box-shadow: inset 3px 0 0 var(--neon), inset 0 0 18px rgba(0, 255, 163, 0.12);
+  background: rgba(33, 200, 255, 0.14);
+  box-shadow: inset 3px 0 0 var(--neon), inset 0 0 22px rgba(33, 200, 255, 0.16);
 }
 
-.status-ok    { color: var(--ok); text-shadow: 0 0 6px rgba(43, 255, 136, 0.55); }
-.status-warn  { color: var(--warn); text-shadow: 0 0 6px rgba(255, 196, 77, 0.5); }
+.status-ok    { color: var(--ok); text-shadow: 0 0 7px rgba(43, 255, 158, 0.6); }
+.status-warn  { color: var(--warn); text-shadow: 0 0 7px rgba(255, 196, 77, 0.55); }
 .status-err   { color: var(--danger); text-shadow: var(--glow-danger); }
 .status-info  { color: var(--info); text-shadow: var(--glow-cyan); }
 .status-pending { color: var(--fg-dim); }
@@ -363,3 +364,54 @@ button.danger:hover:not(:disabled) {
   color: var(--neon);
   text-shadow: var(--glow-neon);
 }
+
+/* -------- Themed confirmation modal (confirmTyped) -------- */
+.modal-overlay {
+  position: fixed;
+  inset: 0;
+  z-index: 10000;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  background: rgba(2, 5, 12, 0.74);
+  backdrop-filter: blur(2px);
+  animation: modalfade 0.12s ease;
+}
+@keyframes modalfade { from { opacity: 0; } to { opacity: 1; } }
+
+.modal {
+  width: 480px;
+  max-width: calc(100vw - 40px);
+  background: var(--bg-elev);
+  border: 1px solid var(--neon);
+  border-radius: 8px;
+  padding: 22px;
+  display: flex;
+  flex-direction: column;
+  gap: 14px;
+  box-shadow: var(--glow-neon-strong), inset 0 0 40px rgba(33, 200, 255, 0.06);
+}
+.modal.modal-danger {
+  border-color: var(--danger);
+  box-shadow: 0 0 14px rgba(255, 59, 107, 0.8), 0 0 34px rgba(255, 59, 107, 0.45), inset 0 0 40px rgba(255, 59, 107, 0.06);
+}
+.modal h3 {
+  margin: 0;
+  font-size: 15px;
+  letter-spacing: 1.5px;
+  text-transform: uppercase;
+  color: var(--neon);
+  text-shadow: var(--glow-neon-strong);
+}
+.modal.modal-danger h3 { color: var(--danger); text-shadow: var(--glow-danger); }
+.modal-body { color: var(--fg); font-size: 13px; line-height: 1.55; }
+.modal-type {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  text-transform: none;
+  letter-spacing: 0;
+  color: var(--fg-dim);
+}
+.modal-type-label { display: block; }
+.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 2px; }
diff --git a/renderer/app.js b/renderer/app.js
index e400e06..a9bcf98 100644
--- a/renderer/app.js
+++ b/renderer/app.js
@@ -459,11 +459,15 @@ $('#btn-delete-selected').addEventListener('click', async () => {
     `You're about to DELETE ${ids.length} ONU(s) from MCMS ` +
     `(${downCount} currently down).\n\n` +
     `This removes the ONU-CFG document and service configuration. ` +
-    `Physical ONUs that come back online will re-register from scratch.\n\n` +
-    `Click OK to continue to the final confirmation.`;
-  if (!confirm(summary)) return;
-  const typed = prompt(`Type DELETE to confirm removal of ${ids.length} ONU(s):`);
-  if (typed !== 'DELETE') {
+    `Physical ONUs that come back online will re-register from scratch.`;
+  const confirmed = await confirmTyped({
+    title: 'Delete ONUs from MCMS',
+    body: summary,
+    requireWord: 'DELETE',
+    confirmLabel: 'Delete',
+    danger: true,
+  });
+  if (!confirmed) {
     $('#delete-status').textContent = 'Cancelled.';
     return;
   }
@@ -696,12 +700,13 @@ $('#btn-execute').addEventListener('click', async () => {
     );
   }
   const fecWarning = warnings.length ? `\n\nWARNING:\n  • ${warnings.join('\n  • ')}` : '';
-  if (!confirm(
-    `About to stage ${targetVersion} to the inactive bank on ${onuIds.length} ONU(s). ` +
-    `Proceed?${fecWarning}`,
-  )) {
-    return;
-  }
+  const proceed = await confirmTyped({
+    title: 'Stage firmware upgrade',
+    body: `About to stage ${targetVersion} to the inactive bank on ${onuIds.length} ONU(s).${fecWarning}`,
+    confirmLabel: 'Execute upgrade',
+    danger: true,
+  });
+  if (!proceed) return;
   $('#btn-execute').disabled = true;
 
   // Save the plan to CSV BEFORE writing anything to MCMS, so even if
@@ -1284,6 +1289,56 @@ function escapeHtml(s) {
     .replace(/'/g, ''');
 }
 
+// Themed confirmation modal. Replaces window.confirm + window.prompt —
+// the latter is NOT supported in Electron (it returns null and shows
+// nothing, which silently aborted the delete/flood-change flows). When
+// `requireWord` is set, the operator must type it exactly to enable the
+// confirm button (the "are you really sure" gate for destructive ops).
+// Resolves true only on an explicit confirm; false on cancel/Escape.
+function confirmTyped({ title, body, requireWord, confirmLabel = 'Confirm', danger = false } = {}) {
+  return new Promise((resolve) => {
+    const needWord = !!requireWord;
+    const overlay = document.createElement('div');
+    overlay.className = 'modal-overlay';
+    overlay.innerHTML = `
+      <div class="modal ${danger ? 'modal-danger' : ''}" role="dialog" aria-modal="true">
+        <h3>${escapeHtml(title || 'Confirm')}</h3>
+        <div class="modal-body">${escapeHtml(body || '').replace(/\n/g, '<br>')}</div>
+        ${needWord ? `<label class="modal-type">
+          <span class="modal-type-label">Type <code>${escapeHtml(requireWord)}</code> to confirm</span>
+          <input type="text" class="modal-input" autocomplete="off" autocapitalize="off" spellcheck="false" />
+        </label>` : ''}
+        <div class="modal-actions">
+          <button class="ghost modal-cancel" type="button">Cancel</button>
+          <button class="${danger ? 'danger' : 'primary'} modal-ok" type="button" ${needWord ? 'disabled' : ''}>${escapeHtml(confirmLabel)}</button>
+        </div>
+      </div>`;
+    document.body.appendChild(overlay);
+
+    const input = overlay.querySelector('.modal-input');
+    const okBtn = overlay.querySelector('.modal-ok');
+    const cancelBtn = overlay.querySelector('.modal-cancel');
+    const matches = () => !needWord || (input && input.value === requireWord);
+
+    const cleanup = (result) => {
+      document.removeEventListener('keydown', onKey, true);
+      overlay.remove();
+      resolve(result);
+    };
+    const onKey = (e) => {
+      if (e.key === 'Escape') { e.preventDefault(); cleanup(false); }
+      else if (e.key === 'Enter' && matches()) { e.preventDefault(); cleanup(true); }
+    };
+
+    if (input) input.addEventListener('input', () => { okBtn.disabled = !matches(); });
+    okBtn.addEventListener('click', () => { if (matches()) cleanup(true); });
+    cancelBtn.addEventListener('click', () => cleanup(false));
+    overlay.addEventListener('mousedown', (e) => { if (e.target === overlay) cleanup(false); });
+    document.addEventListener('keydown', onKey, true);
+    (input || okBtn).focus();
+  });
+}
+
 // -------- OLT inspector: bulk PON flooding mode change --------
 
 $('#btn-to-olts').addEventListener('click', () => {
@@ -1392,10 +1447,15 @@ $('#btn-olt-execute').addEventListener('click', async () => {
     `Apply "${fromMode} → ${targetMode}" to NNI services matching "${tagPattern}" ` +
     `on ${ids.length} OLT(s).\n\nThis GETs each OLT-CFG, mutates the matching ` +
     `NNI Networks entries, and PUTs the full document back. The operation is ` +
-    `irreversible from this app (no undo).\n\nClick OK to continue to the final confirmation.`;
-  if (!confirm(summary)) return;
-  const typed = prompt(`Type APPLY to confirm bulk mode change on ${ids.length} OLT(s):`);
-  if (typed !== 'APPLY') {
+    `irreversible from this app (no undo).`;
+  const confirmed = await confirmTyped({
+    title: 'Apply PON flooding-mode change',
+    body: summary,
+    requireWord: 'APPLY',
+    confirmLabel: 'Execute change',
+    danger: true,
+  });
+  if (!confirmed) {
     $('#olt-exec-status').textContent = 'Cancelled.';
     return;
   }