:root{
  --bg:#f4f6f9; --panel:#fff; --line:#e2e6ec; --text:#1c2430; --muted:#6b7686;
  --accent:#2b6cb0; --accent-text:#fff; --mine:#d6e8fb; --other:#fff; --err:#c0392b;
}
@media (prefers-color-scheme: dark){
  :root{
    --bg:#10151c; --panel:#171e28; --line:#27313f; --text:#e6ebf2; --muted:#8c99ab;
    --accent:#4a90d9; --accent-text:#08121f; --mine:#1f3a57; --other:#1d2633; --err:#ff7b6b;
  }
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{background:var(--bg);color:var(--text);font:15px/1.5 system-ui,"Noto Sans TC","Microsoft JhengHei",sans-serif}
[hidden]{display:none!important}
button{font:inherit;border:0;border-radius:8px;padding:8px 14px;background:var(--accent);color:var(--accent-text);cursor:pointer}
button.ghost{background:transparent;color:var(--text);border:1px solid var(--line)}
button.link{background:none;color:var(--accent);padding:4px}
input,textarea{font:inherit;color:var(--text);background:var(--panel);border:1px solid var(--line);border-radius:8px;padding:9px 12px;width:100%}
.spacer{flex:1}
.hint{color:var(--muted);margin:0 0 4px}
.err{color:var(--err);min-height:1.4em;margin:0}

#auth{min-height:100%;display:grid;place-items:center;padding:16px}
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:24px;width:min(380px,100%);display:grid;gap:10px}
.card h1{margin:0 0 4px;font-size:22px}

#app{display:grid;grid-template-columns:300px 1fr;height:100dvh}
#side{background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;min-height:0}
#side header,#chat header{display:flex;align-items:center;gap:8px;padding:12px 14px;border-bottom:1px solid var(--line)}
.actions{display:flex;gap:8px;padding:10px 14px}
.actions button{flex:1}
#roomList{list-style:none;margin:0;padding:0;overflow:auto;flex:1}
#roomList li{padding:11px 14px;border-bottom:1px solid var(--line);cursor:pointer;display:flex;align-items:center;gap:8px}
#roomList li.active{background:color-mix(in srgb,var(--accent) 14%,transparent)}
#roomList .name{flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.badge{background:var(--err);color:#fff;border-radius:999px;font-size:12px;padding:0 7px;min-width:20px;text-align:center}
#chat{display:flex;flex-direction:column;min-height:0;min-width:0}
.back{display:none}
.conn{font-size:12px;color:var(--muted)}
#msgs{flex:1;overflow:auto;padding:14px;display:flex;flex-direction:column;gap:8px}
.more{align-self:center}
.msg{max-width:min(620px,86%);display:flex;flex-direction:column;gap:2px}
.msg.mine{align-self:flex-end;align-items:flex-end}
.msg .meta{font-size:12px;color:var(--muted)}
.msg .bubble{background:var(--other);border:1px solid var(--line);border-radius:12px;padding:8px 12px;white-space:pre-wrap;overflow-wrap:anywhere}
.msg.mine .bubble{background:var(--mine)}
.msg img{max-width:min(320px,100%);border-radius:8px;display:block;margin-top:6px}
.msg a.file{display:inline-block;margin-top:6px;color:var(--accent)}
#composer{display:flex;gap:8px;padding:10px 12px calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--line);background:var(--panel);align-items:flex-end}
#composer textarea{resize:none;max-height:140px;flex:1;min-width:0;width:auto}
#composer button{white-space:nowrap;flex:none}
@media (max-width:420px){
  #composer{gap:6px;padding-left:8px;padding-right:8px}
  #composer button{padding:8px 10px}
  .mic{padding:6px 9px}
  .attach{padding:0 2px}
}
.attach{font-size:22px;cursor:pointer;padding:0 4px;line-height:38px}
.mic{background:transparent;border:1px solid var(--line);color:var(--text);font-size:18px;padding:6px 12px;
  touch-action:none;user-select:none;-webkit-user-select:none;-webkit-touch-callout:none}
.mic.rec{background:var(--err);border-color:var(--err);color:#fff}
#recBar{display:flex;align-items:center;gap:10px;padding:8px 14px;border-top:1px solid var(--line);
  background:color-mix(in srgb,var(--err) 12%,var(--panel))}
#recBar .dot{width:10px;height:10px;border-radius:50%;background:var(--err);animation:blink 1s infinite}
#recBar.cancelling{background:color-mix(in srgb,var(--muted) 25%,var(--panel))}
#recBar.cancelling .dot{animation:none;background:var(--muted)}
#recTime{font-variant-numeric:tabular-nums;font-weight:600}
#recHint{color:var(--muted);font-size:13px}
@keyframes blink{50%{opacity:.25}}
button.danger{background:var(--err);color:#fff}
.sr{position:fixed;width:1px;height:1px;overflow:hidden;opacity:.01;pointer-events:none}
#gBanner,#gBar{display:flex;align-items:center;gap:10px;padding:8px 14px;border-bottom:1px solid var(--line);flex-wrap:wrap}
#gBanner{background:color-mix(in srgb,var(--accent) 14%,var(--panel))}
#gBar{background:color-mix(in srgb,var(--accent) 22%,var(--panel))}
#gBannerText{flex:1;min-width:0;overflow-wrap:anywhere}
#gTime{font-variant-numeric:tabular-nums;font-weight:600}
#gChips{display:flex;gap:6px;flex-wrap:wrap;flex:1;min-width:0}
.chip{padding:3px 10px;border:2px solid var(--line);border-radius:999px;font-size:13px;background:var(--panel)}
.chip.speaking{border-color:var(--accent)}
.chip.bad{opacity:.55;text-decoration:line-through}
.row.center{justify-content:center}
#callBox{position:fixed;inset:0;z-index:60;display:grid;place-items:center;background:rgba(0,0,0,.55);padding:16px}
.callCard{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:26px 28px;width:min(340px,100%);text-align:center;display:grid;gap:10px}
.callWho{font-size:20px;font-weight:600;overflow-wrap:anywhere}
.callState{color:var(--muted);font-variant-numeric:tabular-nums;min-height:1.5em}
.callCard .row{margin-top:10px}
.callCard button{min-width:92px;padding:11px 16px}
#toast{position:fixed;left:50%;bottom:calc(90px + env(safe-area-inset-bottom));transform:translateX(-50%);z-index:70;
  background:var(--text);color:var(--bg);padding:9px 16px;border-radius:999px;font-size:14px;max-width:90vw}
.voice{display:flex;align-items:center;gap:8px;margin-top:2px}
.voice audio{height:38px;width:min(260px,64vw)}
.voice .dur{color:var(--muted);font-size:13px;font-variant-numeric:tabular-nums}

dialog{border:1px solid var(--line);border-radius:14px;background:var(--panel);color:var(--text);padding:20px;width:min(380px,92vw)}
dialog::backdrop{background:rgba(0,0,0,.45)}
dialog h2{margin:0 0 12px;font-size:18px}
.pick{max-height:50vh;overflow:auto;display:grid;gap:4px;margin:10px 0}
.pick label,.pick button{display:flex;gap:8px;align-items:center;padding:8px;border-radius:8px;border:1px solid var(--line);background:transparent;color:var(--text);text-align:left}
.pick input{width:auto}
.row{display:flex;gap:8px;justify-content:flex-end;margin-top:8px}
.code{font:600 28px/1.2 ui-monospace,Consolas,monospace;letter-spacing:.12em;text-align:center;margin:12px 0;user-select:all}

@media (max-width:760px){
  #app{grid-template-columns:1fr}
  #chat{display:none}
  #app.in-room #side{display:none}
  #app.in-room #chat{display:flex}
  .back{display:inline-block}
}