feat(stripe): add /mo recurring subscription for developer growth support (v17)

css/styles.css

@@ -3269,7 +3269,158 @@ body {
   font-size: 0.92rem;
   line-height: 1.6;
   color: var(--text-muted);
-  margin-bottom: 24px;
+  margin-bottom: 20px;
+}
+
+/* Monthly Subscription Banner */
+.monthly-sub-banner {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 20px;
+  background: linear-gradient(135deg, rgba(16, 185, 129, 0.12), rgba(6, 182, 212, 0.15), rgba(15, 23, 42, 0.9));
+  border: 1.5px solid rgba(16, 185, 129, 0.45);
+  border-radius: 18px;
+  padding: 22px 24px;
+  text-decoration: none;
+  color: inherit;
+  margin-bottom: 22px;
+  box-shadow: 0 8px 30px rgba(16, 185, 129, 0.15), 0 0 20px rgba(6, 182, 212, 0.1);
+  transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
+  position: relative;
+  overflow: hidden;
+}
+
+.monthly-sub-banner:hover {
+  transform: translateY(-3px);
+  border-color: #10b981;
+  box-shadow: 0 14px 36px rgba(16, 185, 129, 0.25), 0 0 25px rgba(6, 182, 212, 0.2);
+}
+
+.monthly-badge {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  background: rgba(16, 185, 129, 0.2);
+  border: 1px solid #10b981;
+  color: #34d399;
+  font-size: 0.7rem;
+  font-weight: 800;
+  text-transform: uppercase;
+  letter-spacing: 0.06em;
+  padding: 3px 10px;
+  border-radius: 9999px;
+  margin-bottom: 8px;
+}
+
+.pulse-sub-dot {
+  width: 7px;
+  height: 7px;
+  border-radius: 50%;
+  background: #10b981;
+  box-shadow: 0 0 8px #10b981;
+  animation: pulseGps 1.8s infinite;
+}
+
+.monthly-title {
+  font-family: var(--font-heading);
+  font-size: 1.35rem;
+  font-weight: 800;
+  color: #ffffff;
+  margin-bottom: 6px;
+}
+
+.monthly-desc {
+  font-size: 0.82rem;
+  color: #94a3b8;
+  line-height: 1.5;
+  max-width: 460px;
+}
+
+.monthly-sub-right {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-end;
+  gap: 10px;
+  flex-shrink: 0;
+}
+
+.monthly-price-wrap {
+  display: flex;
+  align-items: baseline;
+  gap: 4px;
+}
+
+.monthly-price {
+  font-family: var(--font-heading);
+  font-size: 2.3rem;
+  font-weight: 800;
+  color: #ffffff;
+  line-height: 1;
+}
+
+.monthly-cadence {
+  font-size: 0.85rem;
+  color: #6ee7b7;
+  font-weight: 700;
+}
+
+.btn-subscribe-monthly {
+  display: inline-flex;
+  align-items: center;
+  gap: 8px;
+  background: linear-gradient(135deg, #10b981, #059669);
+  color: #ffffff;
+  font-weight: 700;
+  font-size: 0.9rem;
+  padding: 11px 20px;
+  border-radius: 12px;
+  box-shadow: 0 4px 16px rgba(16, 185, 129, 0.4);
+  transition: all 0.2s ease;
+  white-space: nowrap;
+}
+
+.monthly-sub-banner:hover .btn-subscribe-monthly {
+  background: linear-gradient(135deg, #34d399, #10b981);
+  box-shadow: 0 6px 22px rgba(16, 185, 129, 0.6);
+  transform: scale(1.02);
+}
+
+.support-divider {
+  display: flex;
+  align-items: center;
+  text-align: center;
+  margin: 18px 0 20px;
+  color: #64748b;
+  font-size: 0.72rem;
+  font-weight: 700;
+  letter-spacing: 0.08em;
+  text-transform: uppercase;
+}
+
+.support-divider::before,
+.support-divider::after {
+  content: '';
+  flex: 1;
+  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
+}
+
+.support-divider span {
+  padding: 0 14px;
+}
+
+@media (max-width: 680px) {
+  .monthly-sub-banner {
+    flex-direction: column;
+    align-items: stretch;
+    gap: 16px;
+  }
+  .monthly-sub-right {
+    align-items: stretch;
+    flex-direction: row;
+    justify-content: space-between;
+    align-items: center;
+  }
 }
 
 .support-tiers-grid {