:root{
  --bg:#0e1621; --panel:#17212b; --panel2:#202b36; --text:#f5f5f5; --muted:#7f91a4;
  --in:#182533; --out:#2b5278; --accent:#5288c1; --accent2:#64b5ef; --red:#e5484d; --green:#2fb35c;
  --st:env(safe-area-inset-top); --sb:env(safe-area-inset-bottom);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%;background:var(--bg);color:var(--text);
  font:16px/1.35 -apple-system,BlinkMacSystemFont,"SF Pro Text","Segoe UI",Roboto,sans-serif;overscroll-behavior:none}
body{position:fixed;inset:0;overflow:hidden}
.hidden{display:none!important}
button{font:inherit;color:inherit;border:0;background:none;cursor:pointer}
input,textarea{font:inherit;color:var(--text)}
svg{display:block}

/* login */
#login{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;padding:24px}
.loginBox{max-width:360px;width:100%;text-align:center}
.loginBox .logo{width:84px;height:84px;margin:0 auto 12px;border-radius:50%;background:url(/icon-192.png) center/cover}
.loginBox p{color:var(--muted)}
.loginBox input{width:100%;padding:12px 14px;border-radius:12px;border:1px solid #2a3846;background:var(--panel);margin:8px 0 12px}

/* app layout */
#app{position:fixed;inset:0;display:flex;flex-direction:column}
#top{display:flex;align-items:center;gap:6px;padding:calc(var(--st) + 6px) 6px 6px 10px;background:var(--panel);border-bottom:1px solid #0b1219;z-index:2}
.who{flex:1;min-width:0;cursor:pointer}
#peerName{font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
#peerStatus{font-size:13px;color:var(--muted)}
#peerStatus.on{color:var(--accent2)}
.avatar{width:40px;height:40px;border-radius:50%;flex:none;display:flex;align-items:center;justify-content:center;
  font-weight:600;font-size:17px;background:linear-gradient(135deg,#6fb1fc,#4364f7);color:#fff}
.avatar.big{width:110px;height:110px;font-size:44px}
.icon{width:42px;height:42px;border-radius:50%;display:flex;align-items:center;justify-content:center;color:var(--muted);flex:none}
.icon:active{background:rgba(255,255,255,.08)}
.icon svg{width:24px;height:24px}
.icon.accent{color:var(--accent2)}
#banner{background:#1e3247;color:#cfe3f7;font-size:14px;padding:10px 14px;display:flex;gap:10px;align-items:center}
#banner span{flex:1}
#banner button{color:var(--accent2);font-weight:600}

#list{flex:1;overflow-y:auto;-webkit-overflow-scrolling:touch;padding:8px 8px 6px;
  background:var(--bg) radial-gradient(circle at 20% 10%,#13202d 0,transparent 50%)}
#more{display:block;margin:6px auto 10px;padding:6px 14px;border-radius:14px;background:var(--panel2);color:var(--muted);font-size:14px}
.day{text-align:center;margin:10px 0}
.day span{display:inline-block;padding:3px 10px;border-radius:12px;background:rgba(0,0,0,.35);font-size:13px;color:#cdd8e3}

.msg{display:flex;margin:2px 0}
.msg.out{justify-content:flex-end}
.bubble{position:relative;max-width:min(80%,520px);padding:6px 10px 6px;border-radius:16px;background:var(--in);word-wrap:break-word;overflow-wrap:anywhere}
.msg.out .bubble{background:var(--out)}
.msg.in .bubble{border-bottom-left-radius:5px}
.msg.out .bubble{border-bottom-right-radius:5px}
.text{white-space:pre-wrap;display:inline}
.text a{color:#8cc8ff}
.meta{float:right;margin:6px 0 -4px 10px;font-size:12px;color:rgba(255,255,255,.55);white-space:nowrap;display:inline-flex;align-items:center;gap:3px}
.tick{color:rgba(255,255,255,.6);font-size:12px;letter-spacing:-3px;padding-right:3px}
.tick.read{color:#7fd0ff}
.msg.pending .meta{opacity:.7}
.msg.failed .meta{color:#ff8a8a}
.k-image .bubble{padding:3px}
.k-image .meta{position:absolute;right:8px;bottom:8px;margin:0;background:rgba(0,0,0,.45);padding:1px 6px;border-radius:9px;color:#fff;float:none}
.photo{display:block;max-width:100%;width:280px;max-height:380px;object-fit:cover;border-radius:13px;background:#0b1219;cursor:zoom-in}
.voice{display:flex;align-items:center;gap:10px;min-width:220px;padding:2px 0 0}
.vplay{width:42px;height:42px;border-radius:50%;background:var(--accent);display:flex;align-items:center;justify-content:center;flex:none;color:#fff}
.msg.out .vplay{background:#fff;color:var(--out)}
.vplay svg{width:20px;height:20px}
.wave{flex:1;display:flex;align-items:center;gap:2px;height:30px}
.wave i{flex:1;min-width:2px;max-width:4px;border-radius:2px;background:rgba(255,255,255,.3)}
.wave i.on{background:#fff}
.msg.in .wave i.on{background:var(--accent2)}
.vdur{font-size:12px;color:rgba(255,255,255,.65);position:absolute;left:62px;bottom:6px}
.k-voice .bubble{padding-bottom:22px}
.callMsg{display:flex;align-items:center;gap:10px;padding:2px 4px 0 0;cursor:pointer}
.callMsg .ci{width:38px;height:38px;border-radius:50%;background:rgba(255,255,255,.12);display:flex;align-items:center;justify-content:center}
.callMsg .ci svg{width:20px;height:20px}
.callMsg .ct{font-weight:500}
.callMsg .cs{font-size:13px;color:rgba(255,255,255,.6)}
.callMsg.missed .ct{color:#ff8a8a}

#composer{display:flex;align-items:flex-end;gap:4px;padding:6px 6px calc(var(--sb) + 6px);background:var(--panel);border-top:1px solid #0b1219}
#txt{flex:1;resize:none;border:0;outline:0;background:var(--panel2);border-radius:20px;padding:10px 14px;max-height:140px;line-height:1.3;font-size:16px}
#recBar{position:fixed;left:0;right:0;bottom:0;display:flex;align-items:center;gap:10px;padding:10px 12px calc(var(--sb) + 10px);background:var(--panel);border-top:1px solid #0b1219;z-index:3}
.recDot{width:12px;height:12px;border-radius:50%;background:var(--red);animation:blink 1s infinite}
#recTime{font-variant-numeric:tabular-nums;min-width:44px}
.recHint{flex:1;color:var(--muted);font-size:14px}
#recCancel{color:var(--muted);padding:8px 10px}
@keyframes blink{50%{opacity:.25}}
.primary{background:var(--accent);color:#fff;border-radius:12px;padding:9px 16px;font-weight:600}
.wide{display:block;width:100%;padding:12px;border-radius:12px;background:var(--panel2);margin-top:10px}
.wide.primary{background:var(--accent)}

/* call */
#call{position:fixed;inset:0;z-index:20;background:linear-gradient(180deg,#1b2a3a,#0b1219);display:flex;flex-direction:column;align-items:center;justify-content:flex-end}
#remoteVideo{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;background:#000;display:none}
#call.hasVideo #remoteVideo{display:block}
#localVideo{position:absolute;right:14px;top:calc(var(--st) + 14px);width:110px;height:160px;object-fit:cover;border-radius:14px;background:#000;display:none;z-index:2;box-shadow:0 4px 18px rgba(0,0,0,.5)}
#localVideo.mirror{transform:scaleX(-1)}
#call.video #localVideo{display:block}
#call.video.camoff #localVideo{visibility:hidden}
.callInfo{position:absolute;top:calc(var(--st) + 14%);left:0;right:0;text-align:center;z-index:1}
#call.hasVideo .callInfo{top:calc(var(--st) + 18px);text-align:left;left:18px;right:140px}
#call.hasVideo .callInfo .avatar{display:none}
.callInfo .avatar{margin:0 auto 18px}
#callName{font-size:26px;font-weight:600;text-shadow:0 1px 6px rgba(0,0,0,.6)}
#callStatus{color:#c5d3e0;margin-top:6px;font-variant-numeric:tabular-nums;text-shadow:0 1px 6px rgba(0,0,0,.6)}
.callBtns{position:relative;z-index:3;display:flex;justify-content:space-evenly;width:100%;max-width:460px;padding:0 10px calc(var(--sb) + 34px)}
.callBtns>div{display:flex;flex-direction:column;align-items:center;gap:6px;font-size:12px;color:#d8e2ec}
.round{width:64px;height:64px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,.18);color:#fff;backdrop-filter:blur(8px);-webkit-backdrop-filter:blur(8px)}
.round svg{width:28px;height:28px}
.round.off{background:#fff;color:#111}
.round.red{background:var(--red)}
.round.green{background:var(--green)}
#call:not(.video) .vOnly{display:none}
#incomingBtns,#activeBtns{display:none}
#call.incoming #incomingBtns{display:flex}
#call:not(.incoming) #activeBtns{display:flex}
#call.incoming #btnAccept{animation:pulse 1.4s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(47,179,92,.6)}70%{box-shadow:0 0 0 18px rgba(47,179,92,0)}100%{box-shadow:0 0 0 0 rgba(47,179,92,0)}}

/* sheet, viewer, toast */
#sheet{position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:10;display:flex;align-items:flex-end;justify-content:center}
.sheetBox{width:100%;max-width:520px;background:var(--panel);border-radius:18px 18px 0 0;padding:18px 16px calc(var(--sb) + 16px)}
.sheetBox h2{margin:0 0 14px;font-size:20px}
.sheetBox label{font-size:13px;color:var(--muted)}
.row{display:flex;gap:8px;margin-top:6px}
.row input{flex:1;padding:10px 12px;border-radius:12px;border:1px solid #2a3846;background:var(--panel2)}
.note{font-size:13px;color:var(--muted);line-height:1.45}
#viewer{position:fixed;inset:0;z-index:30;background:rgba(0,0,0,.94);display:flex;align-items:center;justify-content:center}
#viewer img{max-width:100%;max-height:100%}
#toast{position:fixed;left:50%;bottom:calc(var(--sb) + 80px);transform:translateX(-50%);background:rgba(20,28,38,.96);padding:10px 16px;border-radius:12px;z-index:40;font-size:14px;max-width:90%;text-align:center;box-shadow:0 4px 18px rgba(0,0,0,.4)}