:root{
  --bg:#0b141a;--panel:#111b21;--panel2:#202c33;--line:#2a3942;--text:#e9edef;
  --muted:#8696a0;--green:#00a884;--green2:#005c4b;--incoming:#202c33;--blue:#53bdeb;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:var(--bg);color:var(--text);overflow:hidden}
button,input{font:inherit}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
.hidden{display:none!important}
.app-shell{height:100dvh;display:grid;grid-template-columns:minmax(300px,390px) minmax(0,1fr);overflow:hidden}
.sidebar,.conversation{min-height:0;min-width:0}
.sidebar{background:var(--panel);border-right:1px solid var(--line);display:grid;grid-template-rows:auto auto auto auto minmax(0,1fr)}
.conversation{position:relative;background:radial-gradient(circle at 25% 15%,rgba(32,44,51,.5),transparent 30%),#0b141a;display:grid;grid-template-rows:auto minmax(0,1fr);min-height:0}
.topbar{height:64px;background:var(--panel2);display:flex;align-items:center;padding:0 16px;gap:12px;border-bottom:1px solid rgba(255,255,255,.03)}
.sidebar-topbar{justify-content:space-between}
.brand{font-weight:750;letter-spacing:-.02em}
.subtle{font-size:12px;color:var(--muted);margin-top:2px}
.icon-btn,.small-btn,.primary-btn,.secondary-btn{border:0;border-radius:10px;color:var(--text)}
.icon-btn{width:40px;height:40px;background:transparent;font-size:23px}
.icon-btn:hover,.small-btn:hover{background:#2a3942}
.connection-strip{padding:8px 12px;font-size:12px;color:var(--muted);border-bottom:1px solid var(--line);min-height:34px}
.connection-strip.ok{color:#7ed6bd}
.connection-strip.error{color:#ff8a80}
.search-wrap{padding:8px 12px}
.search-wrap input{width:100%;height:38px;border:0;outline:0;border-radius:9px;background:var(--panel2);color:var(--text);padding:0 13px}
.sync-panel{padding:9px 12px 11px;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sync-line{display:flex;justify-content:space-between;font-size:12px}
.progress{height:4px;background:#26353d;border-radius:99px;overflow:hidden;margin:7px 0}
.progress div{height:100%;width:0;background:var(--green);transition:width .2s}
.chat-list{min-height:0;overflow-y:auto;overscroll-behavior:contain}
.chat-row{height:72px;display:grid;grid-template-columns:48px minmax(0,1fr) auto;gap:11px;align-items:center;padding:8px 12px;cursor:pointer}
.chat-row:hover,.chat-row.active{background:#202c33}
.chat-avatar,.avatar{display:grid;place-items:center;border-radius:50%;background:#33434c;color:#d7e3e8;font-weight:700}
.chat-avatar{width:48px;height:48px}
.avatar{width:40px;height:40px}
.chat-main{min-width:0;border-bottom:1px solid rgba(134,150,160,.12);padding-bottom:9px}
.chat-head{display:flex;gap:8px;align-items:center}
.chat-name{font-size:16px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;flex:1}
.chat-time{font-size:11px;color:var(--muted)}
.chat-preview{font-size:13px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-top:4px}
.chat-badge{font-size:10px;color:var(--muted)}
.empty-state{padding:30px 18px;color:var(--muted);text-align:center}
.conversation-title{min-width:0;display:flex;flex-direction:column;flex:1}
.conversation-title strong,.conversation-title span{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.conversation-title span{font-size:12px;color:var(--muted);margin-top:3px}
.top-actions{display:flex;gap:8px}
.small-btn{padding:8px 11px;background:transparent;font-size:12px}
.messages{min-height:0;overflow-y:auto;overscroll-behavior:contain;scroll-behavior:auto;padding:18px 5.5vw 26px}
.message-stack{display:flex;flex-direction:column;gap:3px;max-width:1180px;margin:0 auto}
.welcome-card{max-width:700px;margin:10vh auto 0;background:rgba(17,27,33,.94);border:1px solid var(--line);border-radius:18px;padding:30px;box-shadow:0 30px 80px rgba(0,0,0,.24)}
.welcome-card h1{margin:0 0 9px;font-size:29px;letter-spacing:-.03em}
.welcome-card p{color:var(--muted);line-height:1.6}
.welcome-actions{display:flex;gap:10px;margin-top:20px;flex-wrap:wrap}
.primary-btn,.secondary-btn{padding:11px 16px;font-weight:650}
.primary-btn{background:var(--green);color:#061f19}
.secondary-btn{background:var(--panel2)}
.callback-box{margin-top:22px;padding:12px;background:#0b141a;border:1px solid var(--line);border-radius:10px;display:grid;gap:7px}
.callback-box span{font-size:12px;color:var(--muted)}
.callback-box code{overflow-wrap:anywhere;color:#c6d4da;font-size:12px}
.error-box{margin-top:14px;padding:12px;border-radius:9px;background:#3b1d1d;color:#ffb4ab}
.date-sep{align-self:center;background:#182229;color:#aebac1;padding:6px 10px;border-radius:8px;font-size:11px;margin:10px 0 7px;box-shadow:0 1px 2px rgba(0,0,0,.3)}
.bubble{max-width:min(72%,720px);border-radius:8px;padding:6px 8px 5px;box-shadow:0 1px 1px rgba(0,0,0,.2);position:relative;overflow:hidden}
.bubble.in{align-self:flex-start;background:var(--incoming)}
.bubble.out{align-self:flex-end;background:var(--green2)}
.sender{font-size:12px;color:#d7aefb;font-weight:650;margin:1px 2px 4px}
.msg-text{white-space:pre-wrap;overflow-wrap:anywhere;font-size:14px;line-height:1.42;padding:1px 2px 2px}
.msg-meta{display:flex;justify-content:flex-end;align-items:center;gap:5px;color:#b5c0c5;font-size:10px;margin:2px 2px 0 16px}
.media{margin-bottom:6px;border-radius:7px;overflow:hidden;background:#0a1014;min-width:220px}
.media img{display:block;max-width:100%;max-height:560px;object-fit:contain;margin:auto}
.media video{display:block;width:min(100%,640px);max-height:560px;background:#000}
.media audio{display:block;width:min(100%,360px);margin:8px}
.document{display:flex;align-items:center;gap:12px;padding:14px;background:#16242b}
.document-icon{font-size:28px}
.document-info{min-width:0}
.document-name{font-size:13px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.document-open{font-size:11px;color:var(--blue);margin-top:3px}
.unavailable{padding:12px;color:var(--muted);font-size:12px}
.latest-btn{position:absolute;right:22px;bottom:22px;border:0;border-radius:999px;background:#202c33;color:var(--text);box-shadow:0 5px 18px rgba(0,0,0,.35);padding:10px 14px}
@media(max-width:760px){
  body{overflow:hidden}
  .app-shell{grid-template-columns:1fr}
  .sidebar{position:absolute;inset:0;z-index:5}
  .conversation{position:absolute;inset:0;z-index:4}
  body.chat-open .conversation{z-index:6}
  .messages{padding:14px 10px 24px}
  .bubble{max-width:88%}
  .conversation-topbar:before{content:"‹";font-size:32px;line-height:1;cursor:pointer}
  .welcome-card{margin:8vh 12px 0;padding:22px}
}