diff --git a/padelnomics/src/padelnomics/public/templates/landing.html b/padelnomics/src/padelnomics/public/templates/landing.html
index 0e43f08..cbae2a7 100644
--- a/padelnomics/src/padelnomics/public/templates/landing.html
+++ b/padelnomics/src/padelnomics/public/templates/landing.html
@@ -9,26 +9,187 @@
 <meta property="og:type" content="website">
 <meta property="og:url" content="{{ config.BASE_URL }}">
 <link rel="canonical" href="{{ config.BASE_URL }}">
+<style>
+  .teaser-calc {
+    background: #1E293B;
+    border: 1px solid rgba(255,255,255,0.08);
+    border-radius: 12px;
+    padding: 2rem;
+    max-width: 900px;
+    margin: 0 auto;
+  }
+  .teaser-calc .slider-row {
+    display: flex;
+    align-items: center;
+    gap: 1rem;
+    margin-bottom: 1.25rem;
+  }
+  .teaser-calc .slider-row label {
+    width: 140px;
+    flex-shrink: 0;
+    font-size: 13px;
+    color: #94A3B8;
+  }
+  .teaser-calc .slider-row input[type=range] {
+    flex: 1;
+    -webkit-appearance: none;
+    appearance: none;
+    height: 5px;
+    border-radius: 3px;
+    background: rgba(255,255,255,0.08);
+    outline: none;
+    cursor: pointer;
+  }
+  .teaser-calc .slider-row input[type=range]::-webkit-slider-thumb {
+    -webkit-appearance: none;
+    width: 16px; height: 16px;
+    border-radius: 50%;
+    background: #3B82F6;
+    border: 2px solid #0F172A;
+    cursor: pointer;
+  }
+  .teaser-calc .slider-row input[type=range]::-moz-range-thumb {
+    width: 16px; height: 16px;
+    border-radius: 50%;
+    background: #3B82F6;
+    border: 2px solid #0F172A;
+    cursor: pointer;
+  }
+  .teaser-calc .slider-row .val {
+    width: 70px;
+    text-align: right;
+    font-family: 'JetBrains Mono', monospace;
+    font-size: 14px;
+    font-weight: 600;
+    color: #F8FAFC;
+    flex-shrink: 0;
+  }
+  .teaser-results {
+    display: grid;
+    grid-template-columns: repeat(4, 1fr);
+    gap: 1rem;
+    margin-top: 1.5rem;
+    padding-top: 1.5rem;
+    border-top: 1px solid rgba(255,255,255,0.08);
+  }
+  .teaser-metric {
+    text-align: center;
+  }
+  .teaser-metric .tm-label {
+    font-size: 10px;
+    text-transform: uppercase;
+    letter-spacing: 0.05em;
+    color: #64748B;
+    margin-bottom: 4px;
+  }
+  .teaser-metric .tm-value {
+    font-family: 'JetBrains Mono', monospace;
+    font-size: 1.5rem;
+    font-weight: 700;
+    line-height: 1.2;
+  }
+  .teaser-metric .tm-sub {
+    font-size: 11px;
+    color: #64748B;
+    margin-top: 2px;
+  }
+  .tm-green { color: #10B981; }
+  .tm-blue { color: #3B82F6; }
+  .tm-white { color: #F8FAFC; }
+  .tm-red { color: #EF4444; }
+  .teaser-cta {
+    text-align: center;
+    margin-top: 1.5rem;
+    padding-top: 1rem;
+  }
+  .teaser-cta p {
+    font-size: 13px;
+    color: #64748B;
+    margin-bottom: 0.75rem;
+  }
+  @media (max-width: 768px) {
+    .teaser-results { grid-template-columns: repeat(2, 1fr); }
+    .teaser-calc .slider-row { flex-wrap: wrap; }
+    .teaser-calc .slider-row label { width: 100%; margin-bottom: -0.5rem; }
+  }
+</style>
 {% endblock %}
 
 {% block content %}
 <main class="container">
   <!-- Hero -->
-  <header style="text-align: center; padding: 4rem 0 3rem;">
+  <header style="text-align: center; padding: 4rem 0 2rem;">
     <h1 style="font-size: 2.5rem; line-height: 1.15;">Plan Your Padel Business<br>in Minutes, Not Months</h1>
-    <p style="font-size: 1.2rem; max-width: 640px; margin: 1rem auto 0;">
-      The most sophisticated padel court financial planner available. Model your investment with 60+ variables, sensitivity analysis, and professional-grade projections. 100% free.
+    <p style="font-size: 1.2rem; max-width: 640px; margin: 1rem auto 0; color: #94A3B8;">
+      Model your padel court investment with 60+ variables, sensitivity analysis, and professional-grade projections. 100% free.
     </p>
-    <div style="margin-top: 2rem;">
-      {% if user %}
-      <a href="{{ url_for('planner.index') }}" role="button" style="margin-right: 1rem;">Open Planner</a>
-      {% else %}
-      <a href="{{ url_for('auth.signup') }}" role="button" style="margin-right: 1rem;">Create Free Account</a>
-      {% endif %}
-      <a href="{{ url_for('billing.pricing') }}" role="button" class="secondary outline">Learn More</a>
-    </div>
   </header>
 
+  <!-- Teaser Calculator -->
+  <section style="padding: 2rem 0 3rem;">
+    <div class="teaser-calc">
+      <h2 style="text-align: center; margin-bottom: 1.5rem; font-size: 1.25rem;">Quick ROI Estimate</h2>
+
+      <div class="slider-row">
+        <label>Courts</label>
+        <input type="range" id="tc-courts" min="2" max="12" step="1" value="6" oninput="tCalc()">
+        <span class="val" id="tv-courts">6</span>
+      </div>
+      <div class="slider-row">
+        <label>Peak Rate</label>
+        <input type="range" id="tc-rate" min="20" max="100" step="5" value="50" oninput="tCalc()">
+        <span class="val" id="tv-rate">&euro;50/hr</span>
+      </div>
+      <div class="slider-row">
+        <label>Utilization</label>
+        <input type="range" id="tc-util" min="15" max="75" step="5" value="40" oninput="tCalc()">
+        <span class="val" id="tv-util">40%</span>
+      </div>
+      <div class="slider-row">
+        <label>Rent / m&sup2;</label>
+        <input type="range" id="tc-rent" min="2" max="15" step="1" value="4" oninput="tCalc()">
+        <span class="val" id="tv-rent">&euro;4/m&sup2;</span>
+      </div>
+      <div class="slider-row">
+        <label>Exit Multiple</label>
+        <input type="range" id="tc-exit" min="3" max="10" step="0.5" value="6" oninput="tCalc()">
+        <span class="val" id="tv-exit">6.0x</span>
+      </div>
+
+      <div class="teaser-results">
+        <div class="teaser-metric">
+          <div class="tm-label">Total Investment</div>
+          <div class="tm-value tm-white" id="tr-invest">&mdash;</div>
+          <div class="tm-sub">CAPEX (rent model)</div>
+        </div>
+        <div class="teaser-metric">
+          <div class="tm-label">Monthly Cash Flow</div>
+          <div class="tm-value" id="tr-cf">&mdash;</div>
+          <div class="tm-sub">After debt service</div>
+        </div>
+        <div class="teaser-metric">
+          <div class="tm-label">Annual Revenue</div>
+          <div class="tm-value tm-blue" id="tr-rev">&mdash;</div>
+          <div class="tm-sub">Net of booking fees</div>
+        </div>
+        <div class="teaser-metric">
+          <div class="tm-label">Equity IRR</div>
+          <div class="tm-value" id="tr-irr">&mdash;</div>
+          <div class="tm-sub" id="tr-irr-sub">5-year hold</div>
+        </div>
+      </div>
+
+      <div class="teaser-cta">
+        <p>This is a simplified estimate. The full planner models 60+ variables with monthly cash flows, sensitivity analysis, and more.</p>
+        {% if user %}
+        <a href="{{ url_for('planner.index') }}" role="button">Open Full Planner</a>
+        {% else %}
+        <a href="{{ url_for('auth.signup') }}" role="button">Unlock the Full Planner &mdash; Free</a>
+        {% endif %}
+      </div>
+    </div>
+  </section>
+
   <!-- The Journey -->
   <section style="padding: 3rem 0;">
     <h2 style="text-align: center;">From Idea to Operating Hall</h2>
@@ -108,3 +269,121 @@
   </section>
 </main>
 {% endblock %}
+
+{% block scripts %}
+<script>
+function tCalc() {
+  var courts = +document.getElementById('tc-courts').value;
+  var rate = +document.getElementById('tc-rate').value;
+  var util = +document.getElementById('tc-util').value;
+  var rentSqm = +document.getElementById('tc-rent').value;
+  var exitMult = +document.getElementById('tc-exit').value;
+
+  // Display slider values
+  document.getElementById('tv-courts').textContent = courts;
+  document.getElementById('tv-rate').innerHTML = '&euro;' + rate + '/hr';
+  document.getElementById('tv-util').textContent = util + '%';
+  document.getElementById('tv-rent').innerHTML = '&euro;' + rentSqm + '/m\u00B2';
+  document.getElementById('tv-exit').textContent = exitMult.toFixed(1) + 'x';
+
+  // Simplified model (rent model, indoor, all double courts)
+  var sqmPerCourt = 300; // court + shared space
+  var totalSqm = courts * sqmPerCourt;
+  var courtCost = courts * 25000;
+  var capex = courtCost + 60000 + 80000 + 40000 + 100000 + 50000; // elec + sanitary + fitout + planning + parking
+
+  // Revenue
+  var hoursDay = 16, daysMonth = 29;
+  var availHours = courts * hoursDay * daysMonth;
+  var bookedHours = availHours * (util / 100);
+  var offPeakRate = rate * 0.65;
+  var wRate = rate * 0.4 + offPeakRate * 0.6;
+  var courtRev = bookedHours * wRate;
+  var netRev = courtRev * 0.9; // 10% booking fee
+
+  // Operating costs
+  var rent = totalSqm * rentSqm;
+  var opex = rent + courts * 400 + 350; // utilities/maint per court + marketing
+
+  // EBITDA
+  var ebitda = netRev - opex;
+
+  // Financing (85% LTV, 5%, 10yr)
+  var loanPct = 0.85, iRate = 0.05, term = 10;
+  var debt = capex * loanPct;
+  var equity = capex - debt;
+  var mRate = iRate / 12;
+  var nPay = term * 12;
+  var pmt = debt * mRate / (1 - Math.pow(1 + mRate, -nPay));
+  var netCF = ebitda - pmt;
+
+  // Annual figures
+  var annualRev = netRev * 12;
+  var annualCF = netCF * 12;
+
+  // IRR approximation (Newton's method, 5yr hold)
+  var hold = 5;
+  var y3ebitda = ebitda * 12;
+  var exitVal = y3ebitda * exitMult;
+  var cfs = [-equity];
+  for (var y = 1; y <= hold; y++) {
+    var cf = annualCF;
+    if (y === hold) cf += exitVal - debt * Math.pow((1 + mRate), 12 * hold - 12 * hold); // simplified: remaining debt ~ original for short holds
+    // Simplified: remaining debt after Y years
+    var remDebt = 0;
+    if (y === hold) {
+      // Outstanding balance after hold*12 payments
+      var paid = hold * 12;
+      remDebt = debt * Math.pow(1 + mRate, paid) - pmt * (Math.pow(1 + mRate, paid) - 1) / mRate;
+      if (remDebt < 0) remDebt = 0;
+      cf = annualCF + exitVal - remDebt;
+    }
+    cfs.push(cf);
+  }
+
+  var irr = calcIRR(cfs);
+
+  // Format outputs
+  var fmt = function(n) { return (n >= 0 ? '' : '-') + '\u20AC' + Math.abs(Math.round(n)).toLocaleString('de-DE'); };
+
+  document.getElementById('tr-invest').innerHTML = fmt(capex);
+
+  var cfEl = document.getElementById('tr-cf');
+  cfEl.innerHTML = fmt(netCF);
+  cfEl.className = 'tm-value ' + (netCF >= 0 ? 'tm-green' : 'tm-red');
+
+  document.getElementById('tr-rev').innerHTML = fmt(annualRev);
+
+  var irrEl = document.getElementById('tr-irr');
+  if (irr !== null && isFinite(irr)) {
+    irrEl.textContent = (irr * 100).toFixed(1) + '%';
+    irrEl.className = 'tm-value ' + (irr >= 0 ? 'tm-green' : 'tm-red');
+  } else {
+    irrEl.innerHTML = '&mdash;';
+    irrEl.className = 'tm-value tm-white';
+  }
+}
+
+function calcIRR(cfs) {
+  // Newton-Raphson IRR solver
+  var guess = 0.15;
+  for (var i = 0; i < 100; i++) {
+    var npv = 0, dnpv = 0;
+    for (var t = 0; t < cfs.length; t++) {
+      var f = Math.pow(1 + guess, t);
+      npv += cfs[t] / f;
+      if (t > 0) dnpv -= t * cfs[t] / (f * (1 + guess));
+    }
+    if (Math.abs(dnpv) < 1e-10) break;
+    var next = guess - npv / dnpv;
+    if (Math.abs(next - guess) < 1e-7) return next;
+    guess = next;
+    if (guess < -0.99 || guess > 10) return null;
+  }
+  return guess;
+}
+
+// Run on load
+tCalc();
+</script>
+{% endblock %}