:root{
  --bg:#0e1116;--panel:#151a22;--panel2:#1c232d;--line:#262e3a;--text:#e6e8ec;--muted:#8b95a5;
  --blue:#3b82f6;--green:#22c55e;--red:#ef4444;--amber:#f59e0b;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0;background:var(--bg);color:var(--text);
  font:15px/1.4 system-ui,-apple-system,"Segoe UI",Roboto,Arial,sans-serif}
button,input,select{font:inherit;color:inherit}
[hidden]{display:none!important}
.muted{color:var(--muted)}.sm{font-size:13px}
code{font:600 22px ui-monospace,Consolas,monospace;letter-spacing:1px}

#app{display:flex;height:100%;height:100dvh}
#side{width:320px;flex:none;background:var(--panel);border-right:1px solid var(--line);
  overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:14px}
#main{flex:1;min-width:0;display:flex;flex-direction:column}
.empty{margin:auto;color:var(--muted);padding:20px;text-align:center}

.me{background:var(--panel2);border-radius:12px;padding:12px}
.me-top{display:flex;align-items:center;gap:8px}
.me-top .label{flex:1;color:var(--muted);font-size:13px}
.idrow{display:flex;align-items:center;gap:8px;margin:6px 0 2px;flex-wrap:wrap}
.idrow code{flex:1;min-width:120px;user-select:all}
.dot{width:10px;height:10px;border-radius:50%;background:#555;display:inline-block;flex:none}
.dot.on{background:var(--green)}.dot.busy{background:var(--amber)}

h3{margin:0 0 6px;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:4px}
.list li{display:flex;align-items:center;gap:10px;padding:10px;border-radius:10px;cursor:pointer;background:transparent}
.list li:hover,.list li.sel{background:var(--panel2)}
.list li .name{flex:1;font-weight:600;font-family:ui-monospace,Consolas,monospace}
.badgeN{background:var(--blue);color:#fff;border-radius:999px;font-size:12px;padding:1px 8px}
#pendingList li{cursor:default;flex-wrap:wrap}
#pendingList li .name{flex:1 1 100%}

.add{display:flex;gap:8px}
.add input,#msgForm input{flex:1;min-width:0;padding:10px 12px;border-radius:10px;border:1px solid var(--line);
  background:var(--bg);outline:none}
.add input:focus,#msgForm input:focus{border-color:var(--blue)}
.add input{text-transform:uppercase}

button{cursor:pointer;border:1px solid var(--line);background:var(--panel2);border-radius:10px;padding:8px 12px}
button:disabled{opacity:.45;cursor:not-allowed}
button.primary{background:var(--blue);border-color:var(--blue);color:#fff}
button.ghost{background:transparent}
button.sm{padding:4px 10px;font-size:13px}
button.call{background:var(--green);border-color:var(--green);color:#04210f;font-weight:700}
button.danger{background:var(--red);border-color:var(--red);color:#fff}

.chat-head{display:flex;align-items:center;gap:10px;padding:12px 14px;border-bottom:1px solid var(--line);background:var(--panel)}
.chat-head .who{flex:1;display:flex;flex-direction:column;min-width:0}
.chat-head b{font-family:ui-monospace,Consolas,monospace;font-size:17px}
#backBtn{display:none}
#chat{display:flex;flex-direction:column;height:100%;min-height:0}
#msgs{flex:1;overflow-y:auto;padding:14px;display:flex;flex-direction:column;gap:6px}
.msg{max-width:78%;padding:8px 12px;border-radius:14px;background:var(--panel2);word-wrap:break-word;overflow-wrap:anywhere;white-space:pre-wrap}
.msg.me{align-self:flex-end;background:var(--blue);color:#fff}
.msg .ts{display:block;font-size:11px;opacity:.65;margin-top:2px}
.msg.sys{align-self:center;background:transparent;color:var(--muted);font-size:13px}
#msgForm{display:flex;gap:8px;padding:12px;border-top:1px solid var(--line);background:var(--panel);padding-bottom:max(12px,env(safe-area-inset-bottom))}

/* call overlay */
.overlay{position:fixed;inset:0;background:rgba(5,8,12,.94);z-index:50;display:flex;align-items:center;justify-content:center;padding:16px;overflow-y:auto}
.callbox{width:100%;max-width:520px;display:flex;flex-direction:column;gap:14px;align-items:center}
.stage{position:relative;width:100%;aspect-ratio:16/10;background:#0a0d12;border-radius:16px;overflow:hidden;display:flex;align-items:center;justify-content:center;border:1px solid var(--line)}
.stage video#remoteVideo{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}
.stage video#localVideo{position:absolute;right:10px;bottom:10px;width:28%;max-width:140px;border-radius:10px;border:2px solid #000;transform:scaleX(-1);background:#000}
.avatar{width:96px;height:96px;border-radius:50%;background:var(--panel2);display:flex;align-items:center;justify-content:center;font:700 40px ui-monospace,Consolas,monospace}
.overlay[data-state=out] .avatar,.overlay[data-state=in] .avatar{animation:pulse 1.4s ease-in-out infinite}
@keyframes pulse{50%{box-shadow:0 0 0 18px rgba(59,130,246,.15)}}
.info{text-align:center}
.peer{font:700 22px ui-monospace,Consolas,monospace}
.timer{font:600 28px ui-monospace,Consolas,monospace;margin-top:4px}
.badges{display:flex;gap:6px;justify-content:center;margin-top:6px}
.badge{font-size:12px;padding:2px 8px;border-radius:999px;background:var(--panel2)}
.badge.good{background:rgba(34,197,94,.2);color:#7ee2a0}.badge.poor{background:rgba(245,158,11,.2);color:#fbbf24}.badge.lost{background:rgba(239,68,68,.2);color:#fca5a5}.badge.warn{background:rgba(245,158,11,.2);color:#fbbf24}
.devices{width:100%;display:grid;gap:8px}
.devices label{display:flex;flex-direction:column;gap:3px;font-size:12px;color:var(--muted)}
.devices select{padding:9px 10px;border-radius:10px;border:1px solid var(--line);background:var(--panel);color:var(--text);width:100%}
.controls{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
button.round{min-width:64px;height:64px;border-radius:32px;padding:0 18px;font-size:15px;font-weight:600}
button.round.green{background:var(--green);border-color:var(--green);color:#04210f}
button.round.red{background:var(--red);border-color:var(--red);color:#fff}
button.round.off{background:#3a2020;border-color:#5c2b2b}

/* state-dependent visibility */
.overlay .devices,#muteBtn,#camBtn,#acceptBtn,#declineBtn,#hangupBtn,#callTimer{display:none}
.overlay[data-state=out] #hangupBtn{display:inline-block}
.overlay[data-state=in] #acceptBtn,.overlay[data-state=in] #declineBtn{display:inline-block}
.overlay[data-state=conn] .devices,.overlay[data-state=active] .devices{display:grid}
.overlay[data-state=conn] #muteBtn,.overlay[data-state=active] #muteBtn,
.overlay[data-state=conn] #camBtn,.overlay[data-state=active] #camBtn,
.overlay[data-state=conn] #hangupBtn,.overlay[data-state=active] #hangupBtn{display:inline-block}
.overlay[data-state=active] #callTimer{display:block}
#remoteAudio{position:absolute;width:0;height:0;overflow:hidden}

#toasts{position:fixed;left:0;right:0;bottom:18px;display:flex;flex-direction:column;align-items:center;gap:8px;z-index:100;pointer-events:none;padding:0 12px}
.toast{background:#222a36;border:1px solid var(--line);padding:10px 16px;border-radius:12px;box-shadow:0 6px 24px rgba(0,0,0,.4);max-width:420px;text-align:center}

@media (max-width:760px){
  #side{width:100%;border-right:0}
  #main{display:none}
  #app.chat-open #side{display:none}
  #app.chat-open #main{display:flex;width:100%}
  #backBtn{display:inline-block}
}