#messenger-overlay {
  position: fixed; top:0; left:0; width:100vw; height:100vh;
  background: rgba(0,0,0,0.4); z-index:9998;
}
#messenger-window {
  position: fixed; top:50px; left:50%; transform:translateX(-50%);
  width:400px; border-radius:12px; box-shadow:0 2px 12px #0003;
  z-index:9999; background:#fff; display:flex; flex-direction:column;
}
.messenger-header {
  background:#333; color:#fff; padding:10px 16px; display:flex; justify-content:space-between; align-items:center; border-radius:12px 12px 0 0;
}
.section1 { background:#f2f2f2; flex:3; padding:12px; overflow-y:auto; }
.section2 { background:#ccc; flex:1; padding:12px; }
.section3 { background:#222; color:#fff; flex:0; padding:12px; display:flex; justify-content:flex-end; gap:10px; border-radius:0 0 12px 12px; }
.btn-red { background:#d32f2f; color:#fff; border:none; border-radius:6px; padding:6px 14px; font-weight:bold; cursor:pointer; }