:root{
  --accent:#3390ec; --accent-d:#2b7fd1; --bg:#fff; --side-hover:#f1f3f4;
  --out:#e3f4cf; --in:#fff; --wall:#cfe3d4; --text:#17212b; --muted:#7a8791;
  --line:#e6e9ec;
}
@media (prefers-color-scheme:dark){
  :root{--bg:#17212b;--side-hover:#202b36;--out:#2b5278;--in:#182533;--wall:#0e1621;--text:#f1f5f8;--muted:#7f91a4;--line:#0e1621}
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{font:15px/1.4 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--text);background:var(--bg)}
button,input,textarea{font:inherit;color:inherit}
a{color:inherit;text-decoration:none}

.app{display:grid;grid-template-columns:340px 1fr;height:100dvh}
.side{display:flex;flex-direction:column;border-right:1px solid var(--line);min-height:0}
.side-top{display:flex;gap:6px;padding:10px;align-items:center}
.side-top input{flex:1;min-width:0;border:0;background:var(--side-hover);border-radius:20px;padding:9px 14px;outline:none}
.icon{border:0;background:none;font-size:18px;width:36px;height:36px;border-radius:50%;cursor:pointer}
.icon:hover{background:var(--side-hover)}
.chats{flex:1;overflow-y:auto}
.chat{display:flex;gap:10px;align-items:center;padding:9px 12px;margin:0 6px;border-radius:10px}
.chat:hover{background:var(--side-hover)}
.chat.active{background:var(--accent);color:#fff}
.chat.active small,.chat.active time{color:#e6f1fc}
.meta{flex:1;min-width:0;display:flex;flex-direction:column}
.meta b{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.meta small,.chat time{color:var(--muted);font-size:13px}
.meta small{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat time{align-self:flex-start;margin-top:4px}
.ava{flex:none;width:48px;height:48px;border-radius:50%;display:grid;place-items:center;color:#fff;font-weight:600;font-size:19px;
  background:hsl(calc(var(--h)*67),50%,52%)}
.ava.sm{width:34px;height:34px;font-size:15px}
.empty{color:var(--muted);padding:20px;text-align:center}
.side-bottom{display:flex;justify-content:space-between;align-items:center;padding:10px 14px;border-top:1px solid var(--line);color:var(--muted)}
.side-bottom button{border:0;background:none;color:var(--accent);cursor:pointer}

.main{display:flex;flex-direction:column;min-width:0;min-height:0;background:var(--wall)}
.placeholder{margin:auto;background:rgba(0,0,0,.25);color:#fff;padding:5px 14px;border-radius:14px;font-size:14px}
.head{display:flex;gap:12px;align-items:center;padding:8px 16px;background:var(--bg);border-bottom:1px solid var(--line)}
.head .ava{width:42px;height:42px;font-size:17px}
.head small{display:block;color:var(--muted);font-size:13px}
.back{display:none;font-size:22px;padding:0 4px}
.msgs{flex:1;overflow-y:auto;padding:14px max(12px,calc((100% - 720px)/2));display:flex;flex-direction:column;gap:4px}
.msg{max-width:min(520px,82%);padding:6px 10px 4px;border-radius:14px;box-shadow:0 1px 1px rgba(0,0,0,.12);background:var(--in);overflow-wrap:anywhere}
.msg.out{align-self:flex-end;background:var(--out);border-bottom-right-radius:4px}
.msg.in{align-self:flex-start;border-bottom-left-radius:4px}
.msg p{margin:0;white-space:pre-wrap}
.msg time{display:block;text-align:right;font-size:11px;color:var(--muted);margin-top:1px}
.who{display:block;font-size:13px;font-weight:600;color:var(--accent)}
.composer{display:flex;gap:8px;align-items:flex-end;padding:10px max(12px,calc((100% - 720px)/2))}
.composer textarea{flex:1;resize:none;border:0;outline:none;background:var(--bg);border-radius:18px;padding:11px 16px;max-height:140px}
.send{border:0;width:44px;height:44px;border-radius:50%;background:var(--accent);color:#fff;font-size:18px;cursor:pointer}
.send:hover{background:var(--accent-d)}

dialog{border:0;border-radius:14px;padding:20px;width:min(360px,92vw);background:var(--bg);color:var(--text)}
dialog::backdrop{background:rgba(0,0,0,.45)}
dialog h2{margin:0 0 12px;font-size:18px}
dialog input[name=name]{width:100%;border:1px solid var(--line);border-radius:10px;padding:9px 12px;margin-bottom:10px;background:transparent}
.list{max-height:280px;overflow-y:auto;display:flex;flex-direction:column;margin-bottom:12px}
.list a,.list label{display:flex;align-items:center;gap:10px;padding:8px;border-radius:8px;cursor:pointer}
.list a:hover,.list label:hover{background:var(--side-hover)}
.primary{width:100%;border:0;background:var(--accent);color:#fff;padding:10px;border-radius:10px;cursor:pointer}
.close{display:block;margin:10px auto 0;border:0;background:none;color:var(--muted);cursor:pointer}

.auth{display:grid;place-items:center;height:100dvh;background:var(--wall)}
.card{background:var(--bg);padding:28px;border-radius:16px;width:min(380px,92vw)}
.card h1{margin:0 0 14px;font-size:22px}
.card p{margin:0 0 12px}
.card input{width:100%;border:1px solid var(--line);border-radius:10px;padding:9px 12px;background:transparent}
.card .helptext,.card ul{font-size:12px;color:var(--muted);padding-left:16px;margin:4px 0}
.card label{display:block;margin-bottom:4px;font-size:14px}
.alt{text-align:center;margin:14px 0 0!important}.alt a{color:var(--accent)}

@media (max-width:760px){
  .app{grid-template-columns:1fr}
  .app.in-room .side{display:none}
  .app:not(.in-room) .main{display:none}
  .back{display:block}
}

/* ---- online, o'qilmagan, fayl, o'qildi belgisi ---- */
.ava{position:relative}
.ava.online::after{content:"";position:absolute;right:0;bottom:0;width:12px;height:12px;border-radius:50%;
  background:#4cd964;border:2px solid var(--bg)}
.ava.sm.online::after{width:10px;height:10px}
.chat.active .ava.online::after{border-color:var(--accent)}
.side-r{display:flex;flex-direction:column;align-items:flex-end;gap:4px;align-self:flex-start;margin-top:2px}
.chat time{align-self:auto;margin:0}
.badge{min-width:20px;height:20px;padding:0 6px;border-radius:10px;background:var(--accent);color:#fff;
  font-size:12px;line-height:20px;text-align:center}
.badge[hidden]{display:none}
.chat.active .badge{background:#fff;color:var(--accent)}
.att{display:block;max-width:100%;max-height:320px;border-radius:10px;margin:2px 0 4px}
.doc{display:block;padding:4px 0;color:var(--accent);overflow-wrap:anywhere}
.tick{color:var(--muted);letter-spacing:-2px}
.tick.read{color:var(--accent)}
.attach{width:40px;height:44px;display:grid;place-items:center;font-size:20px;cursor:pointer;border-radius:50%}
.attach:hover{background:rgba(0,0,0,.08)}
.composer.busy{opacity:.6;pointer-events:none}