From e1de5a89712dd6a0d1a6470814dc0426b87089f3 Mon Sep 17 00:00:00 2001
From: Oliver Kieselbach <oliver.kieselbach@outlook.com>
Date: Sun, 23 Aug 2026 00:22:26 +0200
Subject: [PATCH] =?UTF-8?q?feat(email):=20image-free=20header=20=E2=80=94?=
 =?UTF-8?q?=20CSS=20stripes,=20slanted=20edge=20and=20border-drawn=20brand?=
 =?UTF-8?q?=20mark?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Progressive enhancement: solid bgcolor band + text wordmark everywhere; the
brand mark is a CSS border trapezoid; diagonal stripes (linear-gradient) and the
slanted bottom edge (clip-path) render where supported and degrade to a flat
band elsewhere. No remote images left in either mail.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
---
 .../Services/EmailTemplates.cs                |  26 ++++++++++--------
 .../public/email/mark.png                     | Bin 493 -> 0 bytes
 2 files changed, 14 insertions(+), 12 deletions(-)
 delete mode 100644 src/Web/autopilot-monitor-web/public/email/mark.png

diff --git a/src/Backend/AutopilotMonitor.Functions/Services/EmailTemplates.cs b/src/Backend/AutopilotMonitor.Functions/Services/EmailTemplates.cs
index 487d8793..8791afec 100644
--- a/src/Backend/AutopilotMonitor.Functions/Services/EmailTemplates.cs
+++ b/src/Backend/AutopilotMonitor.Functions/Services/EmailTemplates.cs
@@ -37,15 +37,16 @@ public static class EmailTemplates
     <tr><td align=""center"">
       <table width=""600"" cellpadding=""0"" cellspacing=""0"" style=""background-color:#ffffff; border-radius:12px; overflow:hidden; box-shadow:0 4px 6px rgba(0,0,0,0.07);"">
 
-        <!-- Header: native HTML (solid bgcolor + text wordmark) so it survives blocked images and
-             clients that drop CSS gradients; only the small brand mark is an image (alt empty). -->
+        <!-- Header: image-free, progressively enhanced. Base (every client): solid bgcolor band +
+             text wordmark + brand mark drawn with a CSS border trapezoid. Enhancements where
+             supported (Apple/iOS Mail, most of Gmail): diagonal stripes via linear-gradient and the
+             slanted bottom edge via clip-path; clients that drop them simply show a flat band. -->
         <tr>
-          <td bgcolor=""#33b161"" style=""background-color:#33b161; padding:28px 40px;"">
+          <td bgcolor=""#33b161"" style=""background-color:#33b161; background-image:linear-gradient(112deg, #33b161 0%, #33b161 44%, #3cbb6a 44%, #3cbb6a 60%, #2ea85a 60%, #2ea85a 78%, #33b161 78%, #33b161 100%); clip-path:polygon(0 0, 100% 0, 100% 100%, 0 80%); padding:28px 40px 52px;"">
             <table cellpadding=""0"" cellspacing=""0"" border=""0"">
               <tr>
-                <td valign=""middle"" style=""padding:0 12px 0 0; line-height:0;"">
-                  <img src=""{Constants.WebsiteBaseUrl}/email/mark.png"" width=""36"" height=""33"" alt=""""
-                       style=""display:block; width:36px; height:33px; border:0;"">
+                <td valign=""middle"" style=""padding:0 14px 0 0; line-height:0; font-size:0;"">
+                  <div style=""width:0; height:20px; border-left:36px solid #ffffff; border-top:13px solid transparent; border-bottom:2px solid transparent; border-right:0; display:block;""></div>
                 </td>
                 <td valign=""middle"" style=""color:#ffffff; font-size:22px; font-weight:600; letter-spacing:-0.2px; line-height:1; white-space:nowrap;"">
                   Autopilot Monitor
@@ -125,15 +126,16 @@ public static class EmailTemplates
     <tr><td align=""center"">
       <table width=""600"" cellpadding=""0"" cellspacing=""0"" style=""background-color:#ffffff; border-radius:12px; overflow:hidden; box-shadow:0 4px 6px rgba(0,0,0,0.07);"">
 
-        <!-- Header: native HTML (solid bgcolor + text wordmark) so it survives blocked images and
-             clients that drop CSS gradients; only the small brand mark is an image (alt empty). -->
+        <!-- Header: image-free, progressively enhanced. Base (every client): solid bgcolor band +
+             text wordmark + brand mark drawn with a CSS border trapezoid. Enhancements where
+             supported (Apple/iOS Mail, most of Gmail): diagonal stripes via linear-gradient and the
+             slanted bottom edge via clip-path; clients that drop them simply show a flat band. -->
         <tr>
-          <td bgcolor=""#33b161"" style=""background-color:#33b161; padding:28px 40px;"">
+          <td bgcolor=""#33b161"" style=""background-color:#33b161; background-image:linear-gradient(112deg, #33b161 0%, #33b161 44%, #3cbb6a 44%, #3cbb6a 60%, #2ea85a 60%, #2ea85a 78%, #33b161 78%, #33b161 100%); clip-path:polygon(0 0, 100% 0, 100% 100%, 0 80%); padding:28px 40px 52px;"">
             <table cellpadding=""0"" cellspacing=""0"" border=""0"">
               <tr>
-                <td valign=""middle"" style=""padding:0 12px 0 0; line-height:0;"">
-                  <img src=""{Constants.WebsiteBaseUrl}/email/mark.png"" width=""36"" height=""33"" alt=""""
-                       style=""display:block; width:36px; height:33px; border:0;"">
+                <td valign=""middle"" style=""padding:0 14px 0 0; line-height:0; font-size:0;"">
+                  <div style=""width:0; height:20px; border-left:36px solid #ffffff; border-top:13px solid transparent; border-bottom:2px solid transparent; border-right:0; display:block;""></div>
                 </td>
                 <td valign=""middle"" style=""color:#ffffff; font-size:22px; font-weight:600; letter-spacing:-0.2px; line-height:1; white-space:nowrap;"">
                   Autopilot Monitor
diff --git a/src/Web/autopilot-monitor-web/public/email/mark.png b/src/Web/autopilot-monitor-web/public/email/mark.png
deleted file mode 100644
index 658081d41f32b27297032effbccd864be09e4416..0000000000000000000000000000000000000000
GIT binary patch
literal 0
HcmV?d00001

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