*{box-sizing:border-box}
:root{
  --bg:#0b1220;
  --panel:#111827;
  --panel-2:#172033;
  --line:#263247;
  --text:#f8fafc;
  --muted:#94a3b8;
  --accent:#22c55e;
  --accent-2:#16a34a;
  --bubble-me:#1d4ed8;
  --bubble-other:#1f2937;
}
html,body{height:100%;margin:0;font-family:Inter,Segoe UI,Arial,sans-serif;background:var(--bg);color:var(--text)}
body{overflow:hidden}
button,input,textarea{font:inherit}
button{cursor:pointer}
button:disabled{opacity:.45;cursor:not-allowed}
.hidden{display:none!important}
.auth-screen{
  min-height:100%;display:grid;place-items:center;padding:24px;
  background:
    radial-gradient(circle at 20% 20%,rgba(37,99,235,.16),transparent 28%),
    radial-gradient(circle at 80% 75%,rgba(34,197,94,.12),transparent 25%),
    var(--bg)
}
.auth-card{
  width:min(100%,420px);border:1px solid var(--line);border-radius:20px;
  background:#0f172a;box-shadow:0 24px 70px rgba(0,0,0,.35);overflow:hidden
}
.auth-brand{border-bottom:0;padding-bottom:10px}
.auth-tabs{display:grid;grid-template-columns:1fr 1fr;padding:0 18px;gap:8px}
.auth-tab{
  border:1px solid var(--line);background:#111827;color:var(--muted);
  min-height:42px;border-radius:10px
}
.auth-tab.active{color:white;border-color:#3b82f6;background:#172554}
.auth-form{display:flex;flex-direction:column;gap:14px;padding:18px}
.auth-form label{display:flex;flex-direction:column;gap:7px;color:#cbd5e1;font-size:13px}
.auth-form input{
  width:100%;border:1px solid var(--line);outline:none;
  padding:11px 12px;border-radius:10px;background:#111827;color:var(--text)
}
.auth-form input:focus{border-color:#3b82f6}
.auth-submit{width:100%;margin-top:4px}
.auth-message{min-height:20px;margin:0;padding:0 18px 20px;color:#86efac;font-size:13px;line-height:1.45}
.auth-message.error{color:#fca5a5}
.app-shell{
  width:100%;height:100%;display:grid;grid-template-columns:320px 1fr;background:var(--panel)
}
.sidebar{
  min-width:0;border-right:1px solid var(--line);display:flex;flex-direction:column;background:#0f172a
}
.brand{
  display:flex;gap:12px;align-items:center;padding:18px;border-bottom:1px solid var(--line)
}
.brand h1{font-size:20px;margin:0}
.brand p{margin:4px 0 0;color:var(--muted);font-size:12px}
.brand-mark{
  width:42px;height:42px;border-radius:12px;display:grid;place-items:center;font-weight:800;
  background:linear-gradient(145deg,#2563eb,#22c55e)
}
.profile-card{
  display:flex;align-items:center;gap:8px;margin:14px;padding:12px;border:1px solid var(--line);
  border-radius:14px;background:var(--panel-2)
}
.profile-copy{display:flex;flex-direction:column;min-width:0;flex:1}
.profile-copy strong,.profile-copy span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.profile-copy span{font-size:12px;color:var(--muted);margin-top:3px}
.avatar{
  width:42px;height:42px;border-radius:50%;display:grid;place-items:center;flex:0 0 42px;font-weight:700;background:#334155
}
.avatar.self{background:#14532d}
.icon-btn,.call-btn{
  border:1px solid var(--line);background:#111827;color:var(--text);border-radius:10px;min-width:38px;height:38px
}
.search-wrap{padding:0 14px 12px}
.search-wrap input{
  width:100%;border:1px solid var(--line);outline:none;padding:10px 12px;border-radius:10px;background:#111827;color:var(--text)
}
.contact-list{overflow:auto;padding:0 8px 12px}
.contact{
  width:100%;border:0;background:transparent;color:inherit;display:flex;align-items:center;gap:10px;text-align:left;
  padding:10px;border-radius:12px
}
.contact:hover{background:#172033}
.contact.active{background:#1e293b}
.contact-copy{min-width:0;display:flex;flex-direction:column;flex:1}
.contact-copy strong,.contact-copy span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.contact-copy span{font-size:12px;color:var(--muted);margin-top:3px}
.status-dot{width:9px;height:9px;border-radius:50%;background:#64748b}
.status-dot.online{background:var(--accent)}
.contacts-empty{padding:18px 12px;text-align:center;color:var(--muted);font-size:13px;line-height:1.4}
.chat{
  min-width:0;display:grid;grid-template-rows:auto 1fr auto;
  background:
    radial-gradient(circle at 20% 20%,rgba(37,99,235,.10),transparent 25%),
    radial-gradient(circle at 80% 80%,rgba(34,197,94,.08),transparent 25%),
    #0b1220
}
.chat-header{
  display:flex;justify-content:space-between;align-items:center;min-height:70px;padding:12px 18px;border-bottom:1px solid var(--line);
  background:rgba(15,23,42,.92);backdrop-filter:blur(8px)
}
.chat-person{display:flex;align-items:center;gap:10px;min-width:0}
.chat-person>div:last-child{display:flex;flex-direction:column;min-width:0}
.chat-person strong,.chat-person span{white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat-person span{color:var(--muted);font-size:12px;margin-top:3px}
.call-actions{display:flex;gap:8px}
.call-btn:hover:not(:disabled){border-color:#475569;background:#1e293b}
.messages{overflow:auto;padding:24px max(18px,5vw);display:flex;flex-direction:column;gap:10px}
.message{
  max-width:min(74%,640px);padding:10px 12px;border-radius:16px;line-height:1.4;word-break:break-word;
  box-shadow:0 4px 18px rgba(0,0,0,.10)
}
.message.other{align-self:flex-start;background:var(--bubble-other);border-bottom-left-radius:4px}
.message.me{align-self:flex-end;background:var(--bubble-me);border-bottom-right-radius:4px}
.message-time{display:block;margin-top:6px;font-size:10px;opacity:.68;text-align:right}
.empty-state{
  margin:auto;max-width:520px;text-align:center;color:var(--muted);border:1px dashed #334155;border-radius:16px;padding:24px;line-height:1.5
}
.composer{
  display:flex;gap:10px;align-items:flex-end;padding:14px 18px;border-top:1px solid var(--line);background:rgba(15,23,42,.96)
}
.composer textarea{
  flex:1;resize:none;max-height:140px;min-height:44px;border:1px solid var(--line);outline:none;
  background:#111827;color:var(--text);padding:11px 12px;border-radius:12px
}
.composer textarea:focus{border-color:#3b82f6}
.send-btn{
  min-height:44px;border:0;border-radius:12px;padding:0 18px;background:var(--accent);color:#052e16;font-weight:700
}
.send-btn:hover:not(:disabled){background:var(--accent-2);color:white}
.toast{
  position:fixed;z-index:20;left:50%;bottom:22px;transform:translate(-50%,20px);background:#020617;color:white;
  border:1px solid #334155;padding:10px 14px;border-radius:10px;opacity:0;pointer-events:none;transition:.2s ease;
  box-shadow:0 10px 30px rgba(0,0,0,.35)
}
.toast.show{opacity:1;transform:translate(-50%,0)}
@media (max-width:760px){
  .app-shell{grid-template-columns:92px 1fr}
  .brand{justify-content:center;padding:14px 8px}
  .brand>div:last-child,.profile-copy,.search-wrap,.contact-copy,.status-dot{display:none}
  .profile-card{justify-content:center;margin:10px 8px;padding:10px 6px;flex-wrap:wrap}
  .profile-card .icon-btn{min-width:34px;width:34px;height:34px}
  .contact{justify-content:center;padding:10px 4px}
  .contacts-empty{font-size:0}
  .contacts-empty:after{content:"Нет";font-size:12px}
  .sidebar{overflow:hidden}
  .message{max-width:88%}
  .composer{padding:10px}
  .send-btn{padding:0 12px}
}