Add auto-discovery SMTP testing, unencrypted support, and BCT branding

public/styles.css

@@ -88,6 +88,7 @@ body {
   gap: 1rem;
   background: linear-gradient(135deg, #fff 0%, #cbd5e1 100%);
   -webkit-background-clip: text;
+  background-clip: text;
   -webkit-text-fill-color: transparent;
 }
 
@@ -104,9 +105,38 @@ body {
   font-weight: 400;
 }
 
+.youtube-link {
+  display: inline-flex;
+  align-items: center;
+  gap: 0.5rem;
+  margin-top: 1rem;
+  padding: 0.6rem 1.2rem;
+  background: rgba(255, 0, 0, 0.1);
+  border: 1px solid rgba(255, 0, 0, 0.3);
+  border-radius: var(--radius-md);
+  color: #ff6b6b;
+  text-decoration: none;
+  font-size: 0.9rem;
+  font-weight: 500;
+  transition: all 0.3s ease;
+}
+
+.youtube-link:hover {
+  background: rgba(255, 0, 0, 0.2);
+  border-color: rgba(255, 0, 0, 0.5);
+  transform: translateY(-2px);
+  box-shadow: 0 4px 12px rgba(255, 0, 0, 0.3);
+}
+
+.youtube-icon {
+  width: 20px;
+  height: 20px;
+}
+
 /* Panel */
 .panel {
   background: var(--bg-glass);
+  -webkit-backdrop-filter: blur(12px);
   backdrop-filter: blur(12px);
   border: 1px solid rgba(255, 255, 255, 0.1);
   border-radius: var(--radius-lg);
@@ -238,6 +268,28 @@ select:focus {
   transform: translateY(0);
 }
 
+.btn-secondary {
+  background: linear-gradient(135deg, #10b981, #059669);
+  color: white;
+  box-shadow: 0 4px 12px rgba(16, 185, 129, 0.4);
+}
+
+.btn-secondary:hover {
+  transform: translateY(-2px);
+  box-shadow: 0 6px 16px rgba(16, 185, 129, 0.5);
+}
+
+.btn-secondary:active {
+  transform: translateY(0);
+}
+
+.form-actions {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
+  gap: 1rem;
+  margin-bottom: var(--spacing-md);
+}
+
 .btn:disabled {
   opacity: 0.7;
   cursor: not-allowed;