:root{
  --navy:#16233f; --navy-2:#24365e; --ink:#1c2333; --muted:#6b7487; --line:#e3e7ef;
  --bg:#f4f6fa; --white:#fff; --mine:#dfe8f8; --theirs:#fff; --accent:#1f8a5b; --red:#d93f3f;
  --blue:#2f7ae5; --chat-bg:#eef1f6; --shadow:0 6px 24px rgba(22,35,63,.14);
  --safe-b:env(safe-area-inset-bottom,0px); --safe-t:env(safe-area-inset-top,0px);
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0;height:100%;background:var(--bg);color:var(--ink);
  font:15px/1.4 system-ui,-apple-system,"Segoe UI",Roboto,"Noto Sans","Noto Color Emoji",sans-serif;overflow:hidden}
button{font:inherit;color:inherit;cursor:pointer;border:0;background:none}
input,textarea{font:inherit;color:inherit}
.hidden{display:none!important}
.muted{color:var(--muted)}
.err{color:var(--red);min-height:1.2em;margin:10px 0 0;font-size:14px}
.screen{position:fixed;inset:0}
svg{display:block}

/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:11px 18px;border-radius:10px;
  font-weight:600;background:var(--line);transition:filter .15s}
.btn:hover{filter:brightness(.96)}
.btn.primary{background:var(--navy);color:#fff}
.btn.danger{background:#fbe9e9;color:var(--red)}
.btn.small{padding:6px 12px;font-size:13px}
.btn.link{background:none;color:var(--navy-2);font-weight:500;padding:8px}
.btn:disabled{opacity:.6;cursor:default}
.icon-btn{width:40px;height:40px;border-radius:50%;display:grid;place-items:center;color:var(--navy);flex:none}
.icon-btn:hover{background:rgba(22,35,63,.07)}
.icon-btn.tiny{width:26px;height:26px;font-size:12px}
.icon-btn.light{color:#fff}
.icon-btn svg{width:22px;height:22px}

/* avatars */
.av{width:42px;height:42px;border-radius:50%;flex:none;display:grid;place-items:center;font-weight:700;color:#fff;
  background:var(--navy-2) center/cover no-repeat;font-size:16px;position:relative;text-transform:uppercase}
.av.big{width:110px;height:110px;font-size:40px}
.av.mid{width:72px;height:72px;font-size:26px}
.av.sm{width:34px;height:34px;font-size:13px}
.av .dot{position:absolute;right:0;bottom:0;width:12px;height:12px;border-radius:50%;background:var(--accent);border:2px solid #fff}
.avatar-btn{border-radius:50%;padding:0}

/* ---------- login ---------- */
#login{display:grid;place-items:center;padding:20px;background:linear-gradient(160deg,var(--navy) 0 38%,var(--bg) 38%)}
.login-card{width:100%;max-width:380px;background:#fff;border-radius:18px;padding:30px 26px;box-shadow:var(--shadow);text-align:center}
.login-logo{width:72px;height:72px;border-radius:18px}
.login-card h1{margin:12px 0 4px;font-size:24px;color:var(--navy)}
.login-card form{display:flex;flex-direction:column;gap:10px;text-align:left;margin-top:18px}
.login-card label{font-size:13px;font-weight:600;color:var(--muted)}
.login-card input{padding:12px 14px;border:1.5px solid var(--line);border-radius:10px;outline:none;font-size:16px}
.login-card input:focus{border-color:var(--navy-2)}
.login-card input.otp{font-size:26px;letter-spacing:10px;text-align:center;font-weight:700}

/* ---------- layout ---------- */
#app{display:flex;padding-top:var(--safe-t)}
#sidebar{width:370px;max-width:100%;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;flex:none}
#chat{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--chat-bg)}
.side-head{display:flex;align-items:center;gap:10px;padding:10px 12px;background:var(--navy);color:#fff}
.side-head h2{flex:1;margin:0;font-size:18px}
.side-head .icon-btn{color:#fff}
.side-head .icon-btn:hover{background:rgba(255,255,255,.12)}
.search{padding:10px 12px;border-bottom:1px solid var(--line)}
.search input,.modal-card .search-in{width:100%;padding:9px 14px;border-radius:20px;border:0;background:var(--bg);outline:none}
.banner{display:flex;align-items:center;gap:8px;padding:8px 12px;background:#fff8e6;font-size:13px;border-bottom:1px solid var(--line)}
.banner span{flex:1}
#convList{list-style:none;margin:0;padding:0;overflow-y:auto;flex:1}
.conv{display:flex;gap:12px;align-items:center;padding:10px 14px;cursor:pointer;border-bottom:1px solid #f1f3f7}
.conv:hover{background:#f7f9fc}
.conv.active{background:#eaf0fa}
.conv .mid{flex:1;min-width:0}
.conv .row{display:flex;align-items:center;gap:8px}
.conv .name{flex:1;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.conv .time{font-size:12px;color:var(--muted)}
.conv .last{flex:1;font-size:13.5px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.conv .last.typing{color:var(--accent);font-style:italic}
.conv.unread .time{color:var(--accent);font-weight:600}
.badge{background:var(--accent);color:#fff;font-size:11.5px;font-weight:700;min-width:20px;height:20px;border-radius:10px;display:grid;place-items:center;padding:0 6px}
.empty{padding:30px;text-align:center}
.chat-empty{margin:auto;text-align:center;padding:20px}
.chat-empty img{width:90px;height:90px;border-radius:22px;opacity:.9}
.chat-empty h3{margin:12px 0 4px;color:var(--navy)}

/* ---------- chat pane ---------- */
#chatPane{display:flex;flex-direction:column;height:100%;position:relative}
.chat-head{display:flex;align-items:center;gap:4px;padding:8px 8px;background:#fff;border-bottom:1px solid var(--line);flex:none}
#backBtn{display:none}
.peer{flex:1;display:flex;align-items:center;gap:10px;text-align:left;min-width:0;padding:2px 6px;border-radius:10px}
.peer-text{display:flex;flex-direction:column;min-width:0}
.peer-text b{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.peer-text small{color:var(--muted);font-size:12.5px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.peer-text small.on{color:var(--accent)}

#messages{flex:1;overflow-y:auto;padding:12px 4% 8px;display:flex;flex-direction:column;gap:2px;
  background-color:var(--chat-bg);
  background-image:radial-gradient(rgba(22,35,63,.05) 1px,transparent 1px);background-size:18px 18px}
.day{align-self:center;background:#fff;color:var(--muted);font-size:12px;padding:4px 12px;border-radius:8px;margin:10px 0 6px;box-shadow:0 1px 1px rgba(0,0,0,.05)}
.loader{align-self:center;color:var(--muted);font-size:13px;padding:8px}
.msg{max-width:min(78%,560px);padding:6px 9px 4px;border-radius:12px;position:relative;box-shadow:0 1px 1px rgba(0,0,0,.06);
  word-wrap:break-word;overflow-wrap:anywhere;margin-top:4px;user-select:text;-webkit-user-select:text}
.msg.mine{align-self:flex-end;background:var(--mine);border-top-right-radius:4px}
.msg.theirs{align-self:flex-start;background:var(--theirs);border-top-left-radius:4px}
.msg.cont{margin-top:1px;border-radius:12px}
.msg .text{white-space:pre-wrap}
.msg .text a{color:var(--blue)}
.msg .text.jumbo{font-size:38px;line-height:1.15}
.msg .meta{float:right;margin:6px 0 -2px 10px;font-size:11px;color:var(--muted);display:flex;align-items:center;gap:3px;white-space:nowrap}
.msg .ticks svg{width:16px;height:12px}
.msg .ticks.read{color:var(--blue)}
.msg.pending{opacity:.7}
.msg.failed .meta{color:var(--red)}
.msg.deleted .text{font-style:italic;color:var(--muted)}
.msg.image{padding:4px}
.msg.image img{display:block;max-width:100%;width:300px;max-height:360px;object-fit:cover;border-radius:9px;cursor:zoom-in;background:#dde3ec}
.msg.image .caption{padding:4px 5px 0}
.msg.image .meta.over{position:absolute;right:10px;bottom:8px;color:#fff;text-shadow:0 1px 2px rgba(0,0,0,.6);margin:0;float:none}
.msg.image.has-cap .meta{padding:0 4px}
.loc{display:block;width:260px;max-width:100%;text-decoration:none;color:inherit}
.loc .map{height:140px;border-radius:9px;background:#dde3ec center/cover;position:relative;overflow:hidden}
.loc .map img{position:absolute;width:256px;height:256px;max-width:none}
.loc .pin{position:absolute;left:50%;top:50%;transform:translate(-50%,-100%);width:30px;height:30px;color:var(--red);filter:drop-shadow(0 2px 2px rgba(0,0,0,.35))}
.loc .attr{position:absolute;right:4px;bottom:2px;font-size:9px;background:rgba(255,255,255,.75);padding:0 3px;border-radius:3px;color:#333}
.loc .lbl{display:flex;align-items:center;gap:6px;padding:6px 4px 0;font-weight:600;color:var(--navy-2)}
.msg.location{padding:4px}
.msg.location .meta{padding:0 4px}
.callpill{align-self:center;display:flex;align-items:center;gap:8px;background:#fff;border-radius:10px;padding:7px 14px;margin:8px 0;font-size:13.5px;box-shadow:0 1px 1px rgba(0,0,0,.05);cursor:default}
.callpill svg{width:18px;height:18px}
.callpill.missed{color:var(--red)}
.callpill small{color:var(--muted)}
#typingRow{align-self:flex-start;background:#fff;border-radius:12px;padding:9px 14px;margin-top:4px;display:flex;gap:4px}
#typingRow i{width:7px;height:7px;border-radius:50%;background:#9aa3b5;animation:bounce 1.2s infinite}
#typingRow i:nth-child(2){animation-delay:.15s}#typingRow i:nth-child(3){animation-delay:.3s}
@keyframes bounce{0%,60%,100%{transform:translateY(0)}30%{transform:translateY(-5px)}}
#scrollDown{position:absolute;right:16px;bottom:78px;width:40px;height:40px;border-radius:50%;background:#fff;box-shadow:var(--shadow);display:grid;place-items:center;color:var(--navy)}

/* composer */
#composer{display:flex;align-items:flex-end;gap:4px;padding:8px 8px calc(8px + var(--safe-b));background:var(--bg);flex:none}
#msgInput{flex:1;resize:none;border:0;outline:none;background:#fff;border-radius:22px;padding:10px 16px;max-height:140px;line-height:1.35;min-height:42px}
.send-btn{width:44px;height:44px;border-radius:50%;background:var(--navy);color:#fff;display:grid;place-items:center;flex:none}
.send-btn svg{width:22px;height:22px}
#composer .icon-btn{width:42px;height:42px;color:var(--muted)}
#composer .icon-btn.on{color:var(--navy)}

#emojiPanel{height:260px;background:#fff;border-top:1px solid var(--line);display:flex;flex-direction:column;flex:none}
#emojiPanel .tabs{display:flex;border-bottom:1px solid var(--line);overflow-x:auto}
#emojiPanel .tabs button{flex:1;padding:8px 6px;font-size:19px;opacity:.55;border-bottom:2px solid transparent;min-width:40px}
#emojiPanel .tabs button.on{opacity:1;border-color:var(--navy)}
#emojiPanel .grid{flex:1;overflow-y:auto;display:grid;grid-template-columns:repeat(auto-fill,minmax(42px,1fr));padding:6px}
#emojiPanel .grid button{font-size:26px;height:44px;border-radius:8px}
#emojiPanel .grid button:hover{background:var(--bg)}

#attachMenu{position:absolute;left:52px;bottom:66px;background:#fff;border-radius:14px;box-shadow:var(--shadow);padding:6px;display:flex;flex-direction:column;z-index:5}
#attachMenu button{display:flex;align-items:center;gap:12px;padding:10px 16px 10px 10px;border-radius:10px;font-weight:500}
#attachMenu button:hover{background:var(--bg)}
#attachMenu .ic{width:36px;height:36px;border-radius:50%;display:grid;place-items:center;color:#fff}
#attachMenu .ic svg{width:19px;height:19px}

/* context menu */
#ctxMenu{position:fixed;z-index:60;background:#fff;border-radius:12px;box-shadow:var(--shadow);padding:6px;min-width:200px}
#ctxMenu button{display:block;width:100%;text-align:left;padding:10px 14px;border-radius:8px}
#ctxMenu button:hover{background:var(--bg)}
#ctxMenu button.danger{color:var(--red)}

/* modal */
#modal{position:fixed;inset:0;background:rgba(15,22,40,.45);z-index:50;display:grid;place-items:center;padding:16px}
.modal-card{background:#fff;border-radius:18px;width:100%;max-width:420px;max-height:88vh;overflow:auto;box-shadow:var(--shadow);padding:20px}
.modal-card h3{margin:0 0 14px;color:var(--navy);display:flex;align-items:center;gap:8px}
.modal-card h3 .sp{flex:1}
.modal-card .actions{display:flex;gap:8px;justify-content:flex-end;margin-top:18px;flex-wrap:wrap}
.people{list-style:none;margin:10px 0 0;padding:0;max-height:55vh;overflow:auto}
.people li{display:flex;align-items:center;gap:12px;padding:9px 6px;border-radius:10px;cursor:pointer}
.people li:hover{background:var(--bg)}
.people li .t{display:flex;flex-direction:column;min-width:0}
.people li small{color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.profile{text-align:center}
.profile .av{margin:0 auto}
.profile .av-wrap{position:relative;width:110px;margin:0 auto}
.profile .cam{position:absolute;right:0;bottom:0;width:36px;height:36px;border-radius:50%;background:var(--navy);color:#fff;display:grid;place-items:center;border:3px solid #fff}
.profile .cam svg{width:16px;height:16px}
.profile h2{margin:12px 0 2px}
.kv{text-align:left;margin-top:16px;border-top:1px solid var(--line)}
.kv div{padding:10px 2px;border-bottom:1px solid var(--line)}
.kv small{display:block;color:var(--muted);font-size:12px}
.kv textarea{width:100%;border:1.5px solid var(--line);border-radius:10px;padding:8px 10px;resize:none;outline:none;margin-top:4px}
.pic-preview{width:100%;max-height:50vh;object-fit:contain;border-radius:12px;background:#111}
.cap-in{width:100%;margin-top:10px;padding:10px 14px;border:1.5px solid var(--line);border-radius:22px;outline:none}
.progress{height:4px;background:var(--line);border-radius:2px;margin-top:10px;overflow:hidden}
.progress i{display:block;height:100%;width:0;background:var(--navy);transition:width .2s}

/* viewer */
#viewer{position:fixed;inset:0;z-index:70;background:rgba(0,0,0,.92);display:grid;place-items:center}
#viewer img{max-width:100%;max-height:100%;object-fit:contain}
#viewerClose{position:absolute;top:calc(10px + var(--safe-t));right:10px;font-size:20px}

/* toast */
#toast{position:fixed;left:50%;bottom:calc(90px + var(--safe-b));transform:translate(-50%,20px);background:#222a3a;color:#fff;padding:10px 18px;border-radius:10px;
  font-size:14px;opacity:0;pointer-events:none;transition:.25s;z-index:90;max-width:90vw;text-align:center}
#toast.show{opacity:1;transform:translate(-50%,0)}

/* ---------- call ---------- */
#callScreen{position:fixed;inset:0;z-index:80;background:radial-gradient(circle at 50% 30%,#2a3d68,#0f1830);color:#fff;
  display:flex;flex-direction:column;align-items:center;justify-content:space-between;padding:calc(50px + var(--safe-t)) 20px calc(40px + var(--safe-b))}
#remoteVideo{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;background:#000;display:none}
#callScreen.video-on #remoteVideo{display:block}
#callScreen.video-on .call-info{text-shadow:0 1px 4px rgba(0,0,0,.6)}
#callScreen.video-on.connected .call-info .av{display:none}
#localVideo{position:absolute;right:14px;top:calc(14px + var(--safe-t));width:min(28vw,150px);aspect-ratio:3/4;object-fit:cover;border-radius:12px;background:#000;
  display:none;transform:scaleX(-1);box-shadow:0 4px 14px rgba(0,0,0,.4);z-index:2}
#localVideo.back{transform:none}
#callScreen.cam-on #localVideo{display:block}
.call-info{position:relative;text-align:center;z-index:1}
.call-info .av{margin:0 auto 16px;box-shadow:0 0 0 8px rgba(255,255,255,.08)}
#callScreen.ringing .call-info .av{animation:pulse 1.6s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(255,255,255,.35)}100%{box-shadow:0 0 0 26px rgba(255,255,255,0)}}
.call-info h2{margin:0;font-size:26px}
.call-info p{margin:6px 0 0;opacity:.8}
.call-actions{position:relative;z-index:2;display:flex;gap:26px}
.round{width:62px;height:62px;border-radius:50%;display:grid;place-items:center;color:#fff}
.round svg{width:26px;height:26px}
.round.red{background:var(--red)}
.round.green{background:#22a35a}
.round.dark{background:rgba(255,255,255,.16)}
.round.dark.off{background:#fff;color:var(--navy)}

/* ---------- mobile ---------- */
@media (max-width:760px){
  #sidebar{width:100%;border:0}
  #chat{position:fixed;inset:0;transform:translateX(100%);transition:transform .22s ease;z-index:10;padding-top:var(--safe-t)}
  #app.show-chat #chat{transform:none}
  #backBtn{display:grid}
  .chat-empty{display:none}
  .msg{max-width:84%}
  #messages{padding:10px 10px 6px}
  .call-actions{gap:18px}
}
.err:not(:empty){background:#fdecec;border:1px solid #f5c2c2;padding:10px 12px;border-radius:10px;font-weight:600}

.guest-form{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.guest-form input,.guest-form select{padding:10px 12px;border:1.5px solid var(--line);border-radius:10px;outline:none;font:inherit;background:#fff;min-width:0}
.guest-form input:focus,.guest-form select:focus{border-color:var(--navy-2)}
.guest-form #gName{grid-column:1/-1}
.guest-form button{grid-column:1/-1}