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+<!DOCTYPE html>
+<html lang="da">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Checkout POC</title>
+  <style>
+    /* Design tokens fra calendar-base.css */
+    :root {
+      /* Colors - UI */
+      --color-border: #e0e0e0;
+      --color-surface: #fff;
+      --color-background: #f5f5f5;
+      --color-background-hover: #f0f0f0;
+      --color-background-alt: #fafafa;
+      --color-text: #333333;
+      --color-text-secondary: #666;
+      --color-primary: #1976d2;
+
+      /* Named color palette */
+      --b-color-blue: #1e88e5;
+      --b-color-green: #43a047;
+      --b-color-red: #e53935;
+      --b-color-amber: #ffb300;
+      --b-color-purple: #8e24aa;
+      --b-color-teal: #00897b;
+      --b-mix: #fff;
+
+      /* Shadows */
+      --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
+      --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
+
+      /* Transitions */
+      --transition-fast: 150ms ease;
+    }
+
+    * { box-sizing: border-box; margin: 0; padding: 0; }
+
+    body {
+      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
+      background: var(--color-background);
+    }
+
+    /* Demo layout */
+    .demo-container {
+      padding: 16px;
+    }
+
+    .demo-btn {
+      padding: 8px 16px;
+      border: 1px solid var(--color-border);
+      border-radius: 4px;
+      cursor: pointer;
+      background: var(--color-primary);
+      color: white;
+      font-size: 14px;
+      font-weight: 500;
+      transition: background var(--transition-fast);
+    }
+
+    .demo-btn:hover {
+      background: #1565c0;
+    }
+
+    /* ==========================================
+       CHECKOUT OVERLAY
+       ========================================== */
+
+    swp-checkout-overlay {
+      position: fixed;
+      inset: 0;
+      background: rgba(0, 0, 0, 0.3);
+      opacity: 0;
+      visibility: hidden;
+      transition: opacity 200ms ease, visibility 200ms ease;
+      z-index: 1000;
+    }
+
+    swp-checkout-overlay.open {
+      opacity: 1;
+      visibility: visible;
+    }
+
+    swp-checkout-panel {
+      position: fixed;
+      top: 0;
+      right: 0;
+      bottom: 0;
+      width: 800px;
+      max-width: 100%;
+      background: var(--color-surface);
+      border-left: 1px solid var(--color-border);
+      box-shadow: -4px 0 16px rgba(0, 0, 0, 0.1);
+      transform: translateX(100%);
+      transition: transform 200ms ease;
+      display: flex;
+      flex-direction: column;
+      z-index: 1001;
+    }
+
+    swp-checkout-panel.open {
+      transform: translateX(0);
+    }
+
+    /* Header */
+    swp-checkout-header {
+      display: flex;
+      align-items: center;
+      gap: 16px;
+      padding: 16px 20px;
+      border-bottom: 1px solid var(--color-border);
+      background: var(--color-background-alt);
+    }
+
+    swp-customer-name {
+      font-size: 18px;
+      font-weight: 600;
+      color: var(--color-text);
+    }
+
+    swp-header-separator {
+      width: 1px;
+      height: 20px;
+      background: var(--color-border);
+    }
+
+    swp-checkout-date {
+      font-size: 14px;
+      color: var(--color-text-secondary);
+    }
+
+    swp-checkout-resource {
+      font-size: 14px;
+      color: var(--color-text-secondary);
+    }
+
+    swp-close-btn {
+      margin-left: auto;
+      width: 32px;
+      height: 32px;
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      border: none;
+      background: none;
+      cursor: pointer;
+      border-radius: 4px;
+      font-size: 18px;
+      color: var(--color-text-secondary);
+      transition: background var(--transition-fast);
+    }
+
+    swp-close-btn:hover {
+      background: var(--color-background-hover);
+    }
+
+    /* Main content - two columns */
+    swp-checkout-content {
+      flex: 1;
+      display: grid;
+      grid-template-columns: 280px 1fr;
+      overflow: hidden;
+    }
+
+    /* Left: Product catalog */
+    swp-product-catalog {
+      display: flex;
+      flex-direction: column;
+      border-right: 1px solid var(--color-border);
+      background: var(--color-background-alt);
+    }
+
+    swp-catalog-header {
+      padding: 12px;
+      border-bottom: 1px solid var(--color-border);
+    }
+
+    swp-search-input {
+      display: flex;
+      align-items: center;
+      gap: 8px;
+      padding: 8px 12px;
+      background: var(--color-surface);
+      border: 1px solid var(--color-border);
+      border-radius: 4px;
+    }
+
+    swp-search-input input {
+      flex: 1;
+      border: none;
+      outline: none;
+      font-size: 14px;
+      background: transparent;
+    }
+
+    swp-search-input input::placeholder {
+      color: var(--color-text-secondary);
+    }
+
+    swp-catalog-list {
+      flex: 1;
+      overflow-y: auto;
+      padding: 12px;
+      display: flex;
+      flex-direction: column;
+      gap: 8px;
+    }
+
+    swp-product-card {
+      display: block;
+      padding: 12px;
+      background: var(--color-surface);
+      border: 1px solid var(--color-border);
+      border-radius: 4px;
+      cursor: pointer;
+      transition: all var(--transition-fast);
+    }
+
+    swp-product-card:hover {
+      border-color: var(--color-primary);
+      box-shadow: var(--shadow-sm);
+    }
+
+    swp-product-name {
+      display: block;
+      font-size: 14px;
+      font-weight: 500;
+      color: var(--color-text);
+      margin-bottom: 4px;
+    }
+
+    swp-product-meta {
+      display: flex;
+      align-items: center;
+      gap: 8px;
+      font-size: 13px;
+      color: var(--color-text-secondary);
+    }
+
+    swp-product-price {
+      font-weight: 500;
+      color: var(--color-text);
+    }
+
+    swp-product-duration {
+      opacity: 0.8;
+    }
+
+    /* Right: Cart */
+    swp-cart-section {
+      display: flex;
+      flex-direction: column;
+      background: var(--color-surface);
+    }
+
+    swp-cart-header {
+      padding: 12px 16px;
+      border-bottom: 1px solid var(--color-border);
+      font-size: 13px;
+      font-weight: 500;
+      text-transform: uppercase;
+      letter-spacing: 0.5px;
+      color: var(--color-text-secondary);
+    }
+
+    swp-cart-list {
+      flex: 1;
+      overflow-y: auto;
+      padding: 16px;
+      display: flex;
+      flex-direction: column;
+      gap: 12px;
+    }
+
+    swp-cart-item {
+      --b-primary: var(--b-color-blue);
+      display: flex;
+      align-items: flex-start;
+      gap: 12px;
+      padding: 12px;
+      background: color-mix(in srgb, var(--b-primary) 5%, var(--b-mix));
+      border-left: 3px solid var(--b-primary);
+      border-radius: 4px;
+    }
+
+    swp-cart-item-content {
+      flex: 1;
+    }
+
+    swp-cart-item-name {
+      display: block;
+      font-size: 15px;
+      font-weight: 500;
+      color: var(--color-text);
+      margin-bottom: 4px;
+    }
+
+    swp-cart-item-meta {
+      display: flex;
+      align-items: center;
+      gap: 6px;
+      font-size: 13px;
+      color: var(--color-text-secondary);
+    }
+
+    swp-cart-item-resource {
+      font-weight: 500;
+    }
+
+    swp-cart-item-price {
+      font-size: 15px;
+      font-weight: 600;
+      color: var(--color-text);
+      white-space: nowrap;
+    }
+
+    swp-cart-item-remove {
+      width: 24px;
+      height: 24px;
+      display: flex;
+      align-items: center;
+      justify-content: center;
+      border: none;
+      background: none;
+      cursor: pointer;
+      border-radius: 4px;
+      font-size: 14px;
+      color: var(--color-text-secondary);
+      opacity: 0.6;
+      transition: all var(--transition-fast);
+    }
+
+    swp-cart-item-remove:hover {
+      opacity: 1;
+      background: color-mix(in srgb, var(--b-color-red) 15%, var(--b-mix));
+      color: var(--b-color-red);
+    }
+
+    /* Cart total */
+    swp-cart-total {
+      display: flex;
+      justify-content: space-between;
+      align-items: center;
+      padding: 16px;
+      margin: 0 16px 16px;
+      background: var(--color-text);
+      color: var(--color-surface);
+      border-radius: 4px;
+    }
+
+    swp-total-label {
+      font-size: 14px;
+      opacity: 0.7;
+    }
+
+    swp-total-amount {
+      font-size: 22px;
+      font-weight: 600;
+    }
+
+    /* Footer */
+    swp-checkout-footer {
+      display: flex;
+      gap: 12px;
+      padding: 16px 20px;
+      border-top: 1px solid var(--color-border);
+      background: var(--color-surface);
+    }
+
+    swp-footer-btn {
+      flex: 1;
+      padding: 14px 20px;
+      border: 1px solid var(--color-border);
+      border-radius: 4px;
+      font-size: 15px;
+      font-weight: 500;
+      font-family: inherit;
+      cursor: pointer;
+      transition: all var(--transition-fast);
+    }
+
+    swp-footer-btn.btn-secondary {
+      background: var(--color-surface);
+      color: var(--color-text);
+    }
+
+    swp-footer-btn.btn-secondary:hover {
+      background: var(--color-background-hover);
+    }
+
+    swp-footer-btn.btn-primary {
+      background: var(--b-color-green);
+      color: white;
+      border-color: var(--b-color-green);
+    }
+
+    swp-footer-btn.btn-primary:hover {
+      background: #388e3c;
+    }
+
+    /* Empty cart state */
+    swp-cart-empty {
+      display: flex;
+      flex-direction: column;
+      align-items: center;
+      justify-content: center;
+      flex: 1;
+      padding: 40px;
+      color: var(--color-text-secondary);
+      text-align: center;
+    }
+
+    swp-cart-empty-icon {
+      font-size: 48px;
+      margin-bottom: 12px;
+      opacity: 0.5;
+    }
+
+    swp-cart-empty-text {
+      font-size: 14px;
+    }
+  </style>
+</head>
+<body>
+  <div class="demo-container">
+    <p style="font-size: 14px; color: var(--color-text-secondary); margin-bottom: 12px;">
+      Klik for at åbne checkout overlay
+    </p>
+    <button class="demo-btn" onclick="openCheckout()">Gå til betaling</button>
+  </div>
+
+  <!-- Overlay -->
+  <swp-checkout-overlay id="checkoutOverlay" onclick="closeCheckout()"></swp-checkout-overlay>
+
+  <!-- Checkout Panel -->
+  <swp-checkout-panel id="checkoutPanel" onclick="event.stopPropagation()">
+    <swp-checkout-header>
+      <swp-customer-name>Sofie Nielsen</swp-customer-name>
+      <swp-header-separator></swp-header-separator>
+      <swp-checkout-date>9. dec 2025</swp-checkout-date>
+      <swp-header-separator></swp-header-separator>
+      <swp-checkout-resource>Emma</swp-checkout-resource>
+      <swp-close-btn onclick="closeCheckout()">✕</swp-close-btn>
+    </swp-checkout-header>
+
+    <swp-checkout-content>
+      <!-- Product Catalog -->
+      <swp-product-catalog>
+        <swp-catalog-header>
+          <swp-search-input>
+            <span>🔍</span>
+            <input type="text" placeholder="Søg produkt eller service..." id="searchInput" oninput="filterProducts()">
+          </swp-search-input>
+        </swp-catalog-header>
+        <swp-catalog-list id="catalogList">
+          <swp-product-card onclick="addToCart('klipning', 'Klipning og styling', 500, '60 min')">
+            <swp-product-name>Klipning og styling</swp-product-name>
+            <swp-product-meta>
+              <swp-product-price>500 DKK</swp-product-price>
+              <swp-product-duration>60 min</swp-product-duration>
+            </swp-product-meta>
+          </swp-product-card>
+          <swp-product-card onclick="addToCart('bundfarve', 'Bundfarve', 800, '90 min')">
+            <swp-product-name>Bundfarve</swp-product-name>
+            <swp-product-meta>
+              <swp-product-price>800 DKK</swp-product-price>
+              <swp-product-duration>90 min</swp-product-duration>
+            </swp-product-meta>
+          </swp-product-card>
+          <swp-product-card onclick="addToCart('olaplex', 'Olaplex behandling', 350, '30 min')">
+            <swp-product-name>Olaplex behandling</swp-product-name>
+            <swp-product-meta>
+              <swp-product-price>350 DKK</swp-product-price>
+              <swp-product-duration>30 min</swp-product-duration>
+            </swp-product-meta>
+          </swp-product-card>
+          <swp-product-card onclick="addToCart('highlights', 'Highlights', 1200, '120 min')">
+            <swp-product-name>Highlights</swp-product-name>
+            <swp-product-meta>
+              <swp-product-price>1.200 DKK</swp-product-price>
+              <swp-product-duration>120 min</swp-product-duration>
+            </swp-product-meta>
+          </swp-product-card>
+          <swp-product-card onclick="addToCart('vask', 'Vask og føn', 150, '20 min')">
+            <swp-product-name>Vask og føn</swp-product-name>
+            <swp-product-meta>
+              <swp-product-price>150 DKK</swp-product-price>
+              <swp-product-duration>20 min</swp-product-duration>
+            </swp-product-meta>
+          </swp-product-card>
+          <swp-product-card onclick="addToCart('shampoo', 'Olaplex Shampoo', 299)">
+            <swp-product-name>Olaplex Shampoo</swp-product-name>
+            <swp-product-meta>
+              <swp-product-price>299 DKK</swp-product-price>
+            </swp-product-meta>
+          </swp-product-card>
+          <swp-product-card onclick="addToCart('conditioner', 'Olaplex Conditioner', 319)">
+            <swp-product-name>Olaplex Conditioner</swp-product-name>
+            <swp-product-meta>
+              <swp-product-price>319 DKK</swp-product-price>
+            </swp-product-meta>
+          </swp-product-card>
+          <swp-product-card onclick="addToCart('hairoil', 'Hair Oil Treatment', 199)">
+            <swp-product-name>Hair Oil Treatment</swp-product-name>
+            <swp-product-meta>
+              <swp-product-price>199 DKK</swp-product-price>
+            </swp-product-meta>
+          </swp-product-card>
+        </swp-catalog-list>
+      </swp-product-catalog>
+
+      <!-- Cart -->
+      <swp-cart-section>
+        <swp-cart-header>Kurv</swp-cart-header>
+        <swp-cart-list id="cartList">
+          <!-- Pre-filled from booking -->
+          <swp-cart-item data-id="klipning">
+            <swp-cart-item-content>
+              <swp-cart-item-name>Klipning og styling</swp-cart-item-name>
+              <swp-cart-item-meta>
+                <swp-cart-item-resource>Emma</swp-cart-item-resource>
+                <span>·</span>
+                <span>60 min</span>
+              </swp-cart-item-meta>
+            </swp-cart-item-content>
+            <swp-cart-item-price>500 DKK</swp-cart-item-price>
+            <swp-cart-item-remove onclick="removeFromCart('klipning')">✕</swp-cart-item-remove>
+          </swp-cart-item>
+          <swp-cart-item data-id="bundfarve">
+            <swp-cart-item-content>
+              <swp-cart-item-name>Bundfarve</swp-cart-item-name>
+              <swp-cart-item-meta>
+                <swp-cart-item-resource>Emma</swp-cart-item-resource>
+                <span>·</span>
+                <span>90 min</span>
+              </swp-cart-item-meta>
+            </swp-cart-item-content>
+            <swp-cart-item-price>800 DKK</swp-cart-item-price>
+            <swp-cart-item-remove onclick="removeFromCart('bundfarve')">✕</swp-cart-item-remove>
+          </swp-cart-item>
+        </swp-cart-list>
+        <swp-cart-total>
+          <swp-total-label>Total</swp-total-label>
+          <swp-total-amount id="totalAmount">1.300 DKK</swp-total-amount>
+        </swp-cart-total>
+      </swp-cart-section>
+    </swp-checkout-content>
+
+    <swp-checkout-footer>
+      <swp-footer-btn class="btn-secondary" onclick="closeCheckout()">Annuller</swp-footer-btn>
+      <swp-footer-btn class="btn-primary" onclick="registerPayment()">Registrer betaling</swp-footer-btn>
+    </swp-checkout-footer>
+  </swp-checkout-panel>
+
+  <script>
+    // Cart state
+    let cart = [
+      { id: 'klipning', name: 'Klipning og styling', price: 500, duration: '60 min', resource: 'Emma' },
+      { id: 'bundfarve', name: 'Bundfarve', price: 800, duration: '90 min', resource: 'Emma' }
+    ];
+
+    function openCheckout() {
+      document.getElementById('checkoutOverlay').classList.add('open');
+      document.getElementById('checkoutPanel').classList.add('open');
+    }
+
+    function closeCheckout() {
+      document.getElementById('checkoutOverlay').classList.remove('open');
+      document.getElementById('checkoutPanel').classList.remove('open');
+    }
+
+    function addToCart(id, name, price, duration) {
+      if (cart.find(item => item.id === id)) return; // Already in cart
+
+      cart.push({ id, name, price, duration, resource: 'Emma' });
+      renderCart();
+    }
+
+    function removeFromCart(id) {
+      cart = cart.filter(item => item.id !== id);
+      renderCart();
+    }
+
+    function renderCart() {
+      const cartList = document.getElementById('cartList');
+
+      if (cart.length === 0) {
+        cartList.innerHTML = `
+          <swp-cart-empty>
+            <swp-cart-empty-icon>🛒</swp-cart-empty-icon>
+            <swp-cart-empty-text>Kurven er tom</swp-cart-empty-text>
+          </swp-cart-empty>
+        `;
+      } else {
+        cartList.innerHTML = cart.map(item => `
+          <swp-cart-item data-id="${item.id}">
+            <swp-cart-item-content>
+              <swp-cart-item-name>${item.name}</swp-cart-item-name>
+              <swp-cart-item-meta>
+                <swp-cart-item-resource>${item.resource}</swp-cart-item-resource>
+                ${item.duration ? `<span>·</span><span>${item.duration}</span>` : ''}
+              </swp-cart-item-meta>
+            </swp-cart-item-content>
+            <swp-cart-item-price>${item.price.toLocaleString('da-DK')} DKK</swp-cart-item-price>
+            <swp-cart-item-remove onclick="removeFromCart('${item.id}')">✕</swp-cart-item-remove>
+          </swp-cart-item>
+        `).join('');
+      }
+
+      // Update total
+      const total = cart.reduce((sum, item) => sum + item.price, 0);
+      document.getElementById('totalAmount').textContent = total.toLocaleString('da-DK') + ' DKK';
+    }
+
+    function filterProducts() {
+      const query = document.getElementById('searchInput').value.toLowerCase();
+      const cards = document.querySelectorAll('swp-product-card');
+
+      cards.forEach(card => {
+        const name = card.querySelector('swp-product-name').textContent.toLowerCase();
+        card.style.display = name.includes(query) ? 'block' : 'none';
+      });
+    }
+
+    function registerPayment() {
+      alert('Betaling registreret!');
+      closeCheckout();
+    }
+
+    document.addEventListener('keydown', (e) => {
+      if (e.key === 'Escape') closeCheckout();
+    });
+  </script>
+</body>
+</html>
