/* Mobile-first full-screen chat navigation */
@media(max-width:760px){
  .app{height:100dvh;min-height:0;display:flex;flex-direction:column;overflow:hidden}
  .sidebar{height:100%;min-height:0;flex:1;border:0;display:flex}
  .chat-area{display:none;height:100dvh;min-height:0;flex:1}
  body.chat-open .sidebar{display:none}
  body.chat-open .chat-area{display:flex}
  .chat-panel{height:100dvh}
  .messages{padding:14px 12px;overscroll-behavior:contain}
  .bubble{max-width:88%;font-size:15px}
  .composer{padding:8px;gap:6px;padding-bottom:max(8px,env(safe-area-inset-bottom))}
  .composer input{min-width:0;font-size:16px;padding:12px 14px}
  .composer button[type=submit]{min-width:48px}
  .chat-head{height:64px;flex-shrink:0}
  .chat-heading{max-width:42vw}
  .call-actions .small-btn{font-size:11px;padding:7px 8px}
  .tabs{position:sticky;top:0;z-index:2;background:#fff}
  .tab{min-height:42px}
  .pane{padding:14px}
  .list-item{min-height:62px;padding:10px;border-radius:14px}
  .side-head{height:64px;flex-shrink:0}
}
@media(min-width:761px){#backToList{display:none!important}}