diff --git a/src/index.html b/src/index.html
index 2ea8e4d..5127ffc 100644
--- a/src/index.html
+++ b/src/index.html
@@ -1795,21 +1795,21 @@ function openPrintPreview(data, mode) {
 
   const previewStyle = `
     <style>
-      body { width: 80mm; margin: 0 auto; font-family: 'Courier New', monospace; font-size: 13px; background: #fff; padding: 10px; }
+      body { width: 80mm; margin: 0 auto; font-family: 'Courier New', monospace; font-size: 18px; background: #fff; padding: 10px; font-weight: bold; }
       .header { text-align: center; margin-bottom: 8px; }
-      .header h1 { font-size: 18px; }
-      .header h2 { font-size: 14px; font-weight: normal; }
+      .header h1 { font-size: 24px; font-weight: bold; }
+      .header h2 { font-size: 18px; font-weight: bold; }
       hr { border: none; border-top: 1px dashed #000; margin: 6px 0; }
-      .section-title { font-weight: bold; font-size: 14px; border-top: 1px dashed #000; padding-top: 4px; margin-top: 6px; }
-      .row { display: flex; justify-content: space-between; padding: 2px 0; }
-      table { width: 100%; border-collapse: collapse; font-size: 12px; }
-      td { padding: 2px 4px; vertical-align: top; }
+      .section-title { font-weight: bold; font-size: 17px; border-top: 1px dashed #000; padding-top: 4px; margin-top: 6px; }
+      .row { display: flex; justify-content: space-between; padding: 2px 0; font-size: 16px; font-weight: bold; }
+      table { width: 100%; border-collapse: collapse; font-size: 16px; font-weight: bold; }
+      td { padding: 2px 4px; vertical-align: top; font-weight: bold; }
       td:nth-child(2) { text-align: right; }
-      td:nth-child(3) { text-align: right; color: #555; font-size: 11px; }
-      .grand-total { font-size: 16px; font-weight: bold; text-align: center; padding: 6px; border: 2px solid #000; margin: 8px 0; }
-      .obs { font-size: 11px; color: #555; margin-top: 6px; white-space: pre-wrap; }
-      .footer { text-align: center; font-size: 11px; color: #555; margin-top: 8px; }
-      @media print { body { background: #fff; } }
+      td:nth-child(3) { text-align: right; color: #555; font-size: 13px; }
+      .grand-total { font-size: 20px; font-weight: bold; text-align: center; padding: 6px; border: 2px solid #000; margin: 8px 0; }
+      .obs { font-size: 13px; color: #555; margin-top: 6px; white-space: pre-wrap; font-weight: normal; }
+      .footer { text-align: center; font-size: 13px; color: #555; margin-top: 8px; font-weight: normal; }
+      @media print { body { background: #fff; font-size: 18px !important; font-weight: bold !important; } }
     </style>
   `;