:root{
  --bg0:#0b1013; --bg1:#10171c; --bg2:#161f26; --bg3:#1d2933;
  --line:#24313c;
  --ink:#e7eef2; --ink-dim:#93a7b3; --ink-faint:#5d7280;
  --aqua:#58c7b3; --aqua-deep:#2c8c7c;
  --amber:#e3a455; --rose:#e07a6a; --green:#67d08a;
  --bubble:#1c2830;
  --own-a:#14555e; --own-b:#0f3f49;
  --f-body:'IBM Plex Sans',system-ui,sans-serif;
  --f-disp:'Unbounded',var(--f-body);
  --f-mono:'JetBrains Mono',ui-monospace,monospace;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;font-family:var(--f-body);background:var(--bg0);color:var(--ink);overflow:hidden}
.hidden{display:none!important}
.mono{font-family:var(--f-mono)}
::selection{background:rgba(88,199,179,.3)}
:focus-visible{outline:2px solid var(--aqua);outline-offset:2px}
::-webkit-scrollbar{width:9px}
::-webkit-scrollbar-thumb{background:var(--bg3);border-radius:9px;border:2px solid var(--bg0)}

/* ================= ЭКРАН ВХОДА ================= */
.auth{position:fixed;inset:0;display:grid;grid-template-columns:1.15fr 1fr}

.auth-brand{position:relative;overflow:hidden;display:flex;align-items:center;
  padding:6vh 6vw;border-right:1px solid var(--line);
  background:
    radial-gradient(rgba(231,238,242,.04) 1px,transparent 1.4px) 0 0/26px 26px,
    linear-gradient(160deg,var(--bg1),var(--bg0))}
.fog{position:absolute;inset:0;pointer-events:none}
.fog i{position:absolute;border-radius:50%;filter:blur(70px)}
.fog i:nth-child(1){width:55%;height:38%;left:-12%;top:16%;opacity:.55;
  background:radial-gradient(closest-side,rgba(88,199,179,.22),transparent);
  animation:drift 26s ease-in-out infinite alternate}
.fog i:nth-child(2){width:65%;height:42%;right:-18%;top:48%;opacity:.5;
  background:radial-gradient(closest-side,rgba(227,164,85,.14),transparent);
  animation:drift 34s ease-in-out infinite alternate-reverse}
@keyframes drift{to{transform:translate(12%,-6%)}}

.brand-copy{position:relative;z-index:1;max-width:560px;animation:rise .6s cubic-bezier(.2,.8,.3,1)}
.wordmark{font:800 clamp(3rem,7vw,5.2rem)/1 var(--f-disp);letter-spacing:.06em;
  background:linear-gradient(120deg,var(--ink) 30%,var(--aqua));
  -webkit-background-clip:text;background-clip:text;color:transparent}
.tagline{margin:18px 0 0;font-size:17px;line-height:1.55;color:var(--ink-dim)}
.features{margin:5vh 0 0;padding:0;list-style:none;display:grid;gap:14px}
.features li{font-size:14px;line-height:1.5;color:var(--ink-dim);
  border-left:2px solid var(--aqua-deep);padding-left:14px;transition:border-color .2s,transform .2s}
.features li:hover{border-color:var(--aqua);transform:translateX(3px)}
.features b{color:var(--ink);font-weight:600}

.auth-side{display:flex;align-items:center;justify-content:center;background:var(--bg0)}
.auth-card{width:min(420px,92%);padding:28px;border:1px solid var(--line);border-radius:18px;
  background:linear-gradient(180deg,var(--bg2),var(--bg1));
  box-shadow:0 30px 60px rgba(0,0,0,.45);animation:rise .5s .1s cubic-bezier(.2,.8,.3,1) backwards}
@keyframes rise{from{opacity:0;transform:translateY(16px)}}
.tabs{display:flex;gap:4px;background:var(--bg0);padding:4px;border-radius:10px;margin-bottom:18px}
.tabs button{flex:1;border:0;background:transparent;color:var(--ink-dim);padding:9px;
  border-radius:8px;cursor:pointer;font:600 14px var(--f-body);transition:.2s}
.tabs button.on{background:var(--bg3);color:var(--ink)}
.field{margin-bottom:14px}
.field label{display:block;font-size:11.5px;letter-spacing:.07em;text-transform:uppercase;color:var(--ink-faint)}
.field input{width:100%;margin-top:6px;padding:11px 12px;border:1px solid var(--line);border-radius:10px;
  background:var(--bg0);color:var(--ink);font:15px var(--f-body);transition:border-color .2s,box-shadow .2s}
.field input:focus{outline:none;border-color:var(--aqua);box-shadow:0 0 0 3px rgba(88,199,179,.15)}
.btn-primary{border:0;border-radius:10px;padding:12px 18px;cursor:pointer;width:100%;
  background:linear-gradient(135deg,var(--aqua),var(--aqua-deep));color:#062420;
  font:700 15px var(--f-body);transition:transform .15s,filter .2s}
.btn-primary:hover{filter:brightness(1.1);transform:translateY(-1px)}
.btn-primary:active{transform:scale(.99)}
.form-error{color:var(--rose);font-size:13px;min-height:18px;margin-top:10px}
.shake{animation:shake .35s}
@keyframes shake{25%{transform:translateX(-6px)}75%{transform:translateX(6px)}}
.auth-hint{margin:12px 0 0;font-size:12.5px;color:var(--ink-faint);text-align:center}

/* ================= КАРКАС ================= */
.app{position:fixed;inset:0;display:grid;grid-template-columns:320px 1fr}
.side{display:flex;flex-direction:column;background:var(--bg1);border-right:1px solid var(--line);min-height:0}
.side-head{display:flex;align-items:center;justify-content:space-between;padding:16px 16px 10px}
.brand-sm{font:800 17px var(--f-disp);letter-spacing:.08em;color:var(--aqua)}
.conn{width:9px;height:9px;border-radius:50%;background:var(--amber);transition:background .3s}
.conn.on{background:var(--green);animation:pulse 2.4s infinite}
@keyframes pulse{0%{box-shadow:0 0 0 0 rgba(103,208,138,.45)}70%{box-shadow:0 0 0 9px rgba(103,208,138,0)}100%{box-shadow:0 0 0 0 rgba(103,208,138,0)}}

.new-room{margin:0 12px 10px;padding:9px;border:1px dashed var(--line);border-radius:10px;
  background:transparent;color:var(--ink-dim);font:600 13px var(--f-body);cursor:pointer;transition:.2s}
.new-room:hover{border-color:var(--aqua);color:var(--aqua);background:rgba(88,199,179,.06)}

.rooms{flex:1;overflow-y:auto;padding:4px 8px;display:flex;flex-direction:column;gap:2px}
.room{position:relative;display:flex;flex-direction:column;gap:3px;text-align:left;width:100%;
  padding:10px 12px 10px 16px;border:0;border-radius:10px;background:transparent;cursor:pointer;
  color:var(--ink);transition:background .18s}
.room::before{content:"";position:absolute;left:5px;top:22%;bottom:22%;width:3px;border-radius:3px;
  background:var(--aqua);transform:scaleY(0);transition:transform .2s}
.room:hover{background:var(--bg2)}
.room.active{background:var(--bg3)}
.room.active::before{transform:scaleY(1)}
.room-name{font-weight:600;font-size:14.5px}
.room-preview{font-size:12.5px;color:var(--ink-faint);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.badge{position:absolute;right:10px;top:10px;padding:2px 7px;border-radius:99px;
  background:var(--amber);color:#241505;font:700 11px var(--f-mono)}

.me{display:flex;align-items:center;gap:10px;padding:12px;border-top:1px solid var(--line)}
.me-ava{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;
  font:700 16px var(--f-disp);color:var(--ink);flex:none}
.me-info{flex:1;min-width:0}
.me-name{font-weight:600;font-size:13.5px}
.me-fp{font-size:10.5px;color:var(--amber);opacity:.85;cursor:help}
.icon-btn{border:0;background:transparent;color:var(--ink-faint);font-size:16px;cursor:pointer;
  padding:6px;border-radius:8px;transition:.2s}
.icon-btn:hover{color:var(--ink);background:var(--bg3)}

/* ================= ЧАТ ================= */
.chat{display:flex;flex-direction:column;min-width:0;min-height:0}
.chat-empty{flex:1;display:flex;flex-direction:column;gap:8px;align-items:center;justify-content:center;
  background:var(--bg0)}
.empty-word{font:500 22px var(--f-disp);color:var(--bg3);letter-spacing:.1em;animation:breathe 4s ease-in-out infinite}
.empty-sub{font:12px var(--f-mono);color:var(--ink-faint);opacity:.6}
@keyframes breathe{50%{opacity:.55;transform:translateY(-4px)}}

.chat-view{flex:1;display:flex;flex-direction:column;min-height:0}
.chat-head{display:flex;align-items:center;padding:13px 22px;border-bottom:1px solid var(--line);
  background:rgba(16,23,28,.85)}
.chat-head h2{margin:0;font:600 16px var(--f-disp);letter-spacing:.03em}
.room-sub{margin-top:3px;font:11.5px var(--f-mono);color:var(--ink-faint)}

.messages{flex:1;overflow-y:auto;padding:20px 22px 8px;display:flex;flex-direction:column;gap:6px;
  background:
    radial-gradient(rgba(231,238,242,.028) 1px,transparent 1.4px) 0 0/26px 26px,
    radial-gradient(1100px 480px at 85% -8%,rgba(88,199,179,.07),transparent 60%),
    radial-gradient(900px 420px at 8% 108%,rgba(227,164,85,.05),transparent 60%),
    var(--bg0)}
.day{align-self:center;margin:10px 0 4px;padding:3px 12px;border-radius:99px;
  border:1px solid var(--line);background:var(--bg2);font:11.5px var(--f-mono);color:var(--ink-dim)}
.msg{display:flex;animation:pop .25s cubic-bezier(.2,.9,.3,1.15)}
.msg.own{justify-content:flex-end}
@keyframes pop{from{opacity:0;transform:translateY(8px) scale(.98)}}
.bubble{max-width:min(72ch,78%);padding:8px 12px 7px;border-radius:14px;background:var(--bubble);
  border:1px solid rgba(255,255,255,.045);box-shadow:0 2px 10px rgba(0,0,0,.25)}
.msg:not(.own) .bubble{border-bottom-left-radius:4px}
.msg.own .bubble{background:linear-gradient(160deg,var(--own-a),var(--own-b));
  border-color:rgba(88,199,179,.25);border-bottom-right-radius:4px}
.msg-author{font-size:12px;font-weight:600;color:var(--aqua);margin-bottom:2px}
.msg-body{font-size:15px;line-height:1.45;white-space:pre-wrap;word-break:break-word}
.msg-time{float:right;margin:8px -2px -2px 10px;font:10.5px var(--f-mono);color:var(--ink-faint)}

.typing{display:flex;align-items:center;gap:5px;padding:2px 24px 6px;font-size:12.5px;color:var(--ink-dim)}
.typing span{width:5px;height:5px;border-radius:50%;background:var(--aqua);animation:blink 1.2s infinite}
.typing span:nth-child(2){animation-delay:.2s}
.typing span:nth-child(3){animation-delay:.4s}
.typing b{font-weight:500;margin-left:3px}
@keyframes blink{0%,70%,100%{opacity:.25;transform:translateY(0)}35%{opacity:1;transform:translateY(-3px)}}

.composer{display:flex;gap:10px;align-items:flex-end;padding:12px 18px 16px;
  border-top:1px solid var(--line);background:var(--bg1)}
.composer textarea{flex:1;resize:none;padding:11px 14px;border:1px solid var(--line);border-radius:12px;
  background:var(--bg0);color:var(--ink);font:15px/1.4 var(--f-body);max-height:160px;
  transition:border-color .2s,box-shadow .2s}
.composer textarea:focus{outline:none;border-color:var(--aqua);box-shadow:0 0 0 3px rgba(88,199,179,.13)}
#send-btn{width:44px;height:44px;flex:none;border:0;border-radius:50%;cursor:pointer;
  display:grid;place-items:center;font-size:18px;color:#04201c;
  background:linear-gradient(135deg,var(--aqua),var(--aqua-deep));
  transition:transform .15s,filter .2s}
#send-btn:hover{transform:scale(1.08) rotate(-8deg);filter:brightness(1.1)}
#send-btn:active{transform:scale(.94)}

/* ================= ДИАЛОГИ ================= */
dialog{border:1px solid var(--line);border-radius:14px;padding:22px;width:min(420px,92vw);
  background:var(--bg2);color:var(--ink)}
dialog::backdrop{background:rgba(5,10,13,.65);backdrop-filter:blur(3px)}
dialog h3{margin:0 0 16px;font:600 16px var(--f-disp)}
dialog menu{display:flex;gap:10px;justify-content:flex-end;margin:16px 0 0;padding:0;list-style:none}
dialog menu button{border:0;border-radius:9px;padding:9px 16px;cursor:pointer;
  background:var(--bg3);color:var(--ink);font:600 13.5px var(--f-body)}
dialog menu .btn-primary{width:auto}
.invite-list{display:flex;flex-direction:column;gap:8px;max-height:300px;overflow-y:auto}
.invite-row{display:flex;justify-content:space-between;align-items:center;gap:10px;
  padding:9px 12px;border:1px solid var(--line);border-radius:9px;background:var(--bg1)}
.invite-row code{font:600 14px var(--f-mono);color:var(--amber);letter-spacing:.06em}
.inv-status{font-size:12px;color:var(--green)}
.inv-status.used{color:var(--ink-faint)}

@media (max-width:900px){
  .auth{grid-template-columns:1fr}
  .auth-brand{display:none}
  .app{grid-template-columns:240px 1fr}
}