:root{
  --bg:#111b21;
  --panel:#202c33;
  --panel2:#111b21;
  --line:#2a3942;
  --text:#e9edef;
  --muted:#8696a0;
  --green:#00a884;
  --bubble-out:#005c4b;
  --bubble-in:#202c33;
  --search:#202c33;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%;font-family:"Segoe UI",Arial,sans-serif;background:#0b141a;color:var(--text)}
body{overflow:hidden}
.app-shell{
  height:100vh;
  display:grid;
  grid-template-columns:390px 1fr;
  max-width:1600px;
  margin:0 auto;
  background:#0b141a;
}
.sidebar{border-right:1px solid var(--line);background:#111b21;display:flex;flex-direction:column;min-width:0}
.sidebar-header,.chat-header{
  height:60px;background:#202c33;display:flex;align-items:center;justify-content:space-between;padding:0 14px;
}
.avatar-me{
  width:40px;height:40px;border-radius:50%;background:#6b7c85;display:flex;align-items:center;justify-content:center;
  font-size:11px;font-weight:700;color:white;
}
.header-actions{display:flex;gap:10px}
.icon-btn,.send-btn{
  border:0;background:transparent;color:#aebac1;font-size:23px;cursor:pointer;width:38px;height:38px;border-radius:50%;
}
.icon-btn:hover,.send-btn:hover{background:#2a3942}
.search-wrap{padding:8px 12px}
.search-box{height:36px;background:var(--search);border-radius:8px;display:flex;align-items:center;gap:10px;padding:0 12px;color:var(--muted)}
.search-box input{border:0;outline:0;background:transparent;color:var(--text);width:100%;font-size:14px}
.filters{display:flex;gap:8px;padding:0 12px 8px}
.filter{
  border:0;border-radius:18px;padding:7px 13px;background:#202c33;color:#aebac1;cursor:pointer
}
.filter.active{background:#0a332c;color:#00a884}
.chat-list{overflow:auto;flex:1}
.chat-item{
  height:72px;display:grid;grid-template-columns:54px 1fr;gap:10px;padding:8px 12px;cursor:pointer;
}
.chat-item:hover,.chat-item.active{background:#202c33}
.avatar-img{width:42px;height:42px;border-radius:50%;object-fit:cover;background:#33444d}
.chat-item .avatar-img{width:49px;height:49px}
.chat-summary{min-width:0;border-bottom:1px solid rgba(134,150,160,.12);padding-bottom:7px}
.chat-topline,.chat-previewline{display:flex;align-items:center;justify-content:space-between;gap:8px}
.chat-name{font-size:16px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.chat-time,.message-time{font-size:11px;color:var(--muted)}
.preview{font-size:13px;color:var(--muted);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.unread{min-width:20px;height:20px;border-radius:20px;background:#00a884;color:#0b141a;font-size:11px;font-weight:700;display:flex;align-items:center;justify-content:center}
.chat-panel{display:grid;grid-template-rows:60px 1fr 62px;min-width:0;background:#0b141a}
.contact-block{display:flex;align-items:center;gap:12px}
.active-name{font-size:16px}.active-status{font-size:12px;color:var(--muted);margin-top:2px}
.messages{
  overflow:auto;padding:28px clamp(24px,8vw,110px);
  background-color:#0b141a;
  background-image:
   linear-gradient(rgba(11,20,26,.88),rgba(11,20,26,.88)),
   radial-gradient(circle at 20% 20%,#2a3942 1.4px,transparent 1.6px);
  background-size:auto,28px 28px;
}
.day-label{
  width:max-content;margin:0 auto 22px;padding:6px 12px;border-radius:7px;background:#182229;color:#aebac1;font-size:12px;
}
.message-row{display:flex;margin:5px 0}
.message-row.out{justify-content:flex-end}
.bubble{
  position:relative;max-width:min(68%,720px);padding:7px 9px 5px;border-radius:8px;background:var(--bubble-in);
  box-shadow:0 1px 1px rgba(0,0,0,.15);font-size:14.4px;line-height:1.35;
}
.out .bubble{background:var(--bubble-out)}
.bubble-text{padding-right:55px;white-space:pre-wrap}
.meta{display:flex;justify-content:flex-end;align-items:center;gap:4px;margin-top:-5px;min-height:18px}
.check{color:#53bdeb;font-size:13px}
.alert-bubble{border-left:3px solid #f0b429}
.system-message{
  width:max-content;max-width:80%;margin:12px auto;padding:7px 10px;border-radius:7px;background:#182229;
  color:#aebac1;font-size:12px;text-align:center;
}
.composer{background:#202c33;display:grid;grid-template-columns:42px 42px 1fr 44px;align-items:center;padding:8px 12px;gap:4px}
.composer input{height:42px;border:0;outline:0;border-radius:8px;background:#2a3942;color:var(--text);font-size:15px;padding:0 14px}
.send-btn{color:#aebac1}
.demo-badge{
  position:fixed;right:14px;top:9px;z-index:10;background:#b91c1c;color:white;font-size:10px;font-weight:700;
  padding:5px 8px;border-radius:4px;letter-spacing:.5px;pointer-events:none;
}
@media(max-width:800px){
  .app-shell{grid-template-columns:1fr}
  .sidebar{display:none}
  .messages{padding:20px 14px}
  .bubble{max-width:86%}
  .demo-badge{top:auto;bottom:70px}
}


.session-timer{
  position:fixed;top:10px;left:50%;transform:translateX(-50%);z-index:30;
  background:#202c33;color:#d1d7db;border:1px solid #2a3942;border-radius:18px;
  padding:6px 12px;font-size:12px;font-weight:600;box-shadow:0 2px 10px rgba(0,0,0,.18);
}
.session-timer.expired{color:#00a884}
.validation-overlay{
  position:fixed;inset:0;z-index:1000;background:rgba(11,20,26,.86);
  display:flex;align-items:center;justify-content:center;padding:24px;
}
.validation-overlay[hidden]{display:none}
.validation-card{
  width:min(410px,100%);background:#202c33;border:1px solid #2a3942;border-radius:12px;
  padding:28px;box-shadow:0 18px 50px rgba(0,0,0,.45);text-align:center;
}
.validation-icon{font-size:36px;margin-bottom:8px}
.validation-card h2{margin:6px 0 10px;font-size:21px;color:#e9edef}
.validation-card p{margin:0 0 14px;color:#aebac1;line-height:1.45;font-size:14px}
.validation-card .training-note{
  background:#182229;border-left:3px solid #00a884;border-radius:6px;padding:9px 10px;
  text-align:left;color:#d1d7db;font-size:12px;
}
.validation-card form{text-align:left;margin-top:18px}
.validation-card label{display:block;margin-bottom:7px;color:#d1d7db;font-size:13px}
.validation-card input{
  width:100%;height:44px;border:1px solid #3b4a54;border-radius:8px;background:#111b21;
  color:#e9edef;padding:0 12px;font-size:18px;letter-spacing:4px;outline:none;
}
.validation-card input:focus{border-color:#00a884;box-shadow:0 0 0 2px rgba(0,168,132,.15)}
.validation-error{min-height:19px;color:#ff8a80;font-size:12px;margin-top:6px}
.validation-button{
  width:100%;height:43px;border:0;border-radius:8px;background:#00a884;color:#071b16;
  font-weight:700;font-size:14px;cursor:pointer;margin-top:8px;
}
.validation-button:hover{filter:brightness(1.05)}
@media(max-width:800px){
  .session-timer{top:8px;font-size:11px}
  .validation-card{padding:22px}
}