*{box-sizing:border-box}
body{margin:0;min-height:100vh;font-family:Inter,Segoe UI,Arial,sans-serif;color:#172033;background:#f4f6f8}
button,input,textarea,select{font:inherit}
button{cursor:pointer}
.brand{display:flex;align-items:center;gap:10px;font-weight:900}
.brand img{width:34px;height:34px}
.login-shell{min-height:100vh;display:grid;place-items:center;background:#eef2f7}
.login-panel{width:min(420px,calc(100% - 32px));display:grid;gap:18px}
.login-card,.panel,.modal-card{background:#fff;border:1px solid #d9e1ea;border-radius:8px;box-shadow:0 18px 44px #16243a12}
.login-card{padding:22px;display:grid;gap:12px}
.login-card h1{margin:0;font-size:28px}
label{display:grid;gap:7px;color:#3b495c;font-size:13px}
input,textarea,select{width:100%;border:1px solid #c8d3df;border-radius:7px;padding:10px 11px;background:#fff;color:#172033}
textarea{resize:vertical}
button{border:1px solid #c7d2df;background:#fff;color:#172033;border-radius:7px;padding:9px 12px;font-weight:700}
.login-card button,.compose,.message-form button,.panel button,.modal-card>button{background:#1463ff;color:#fff;border-color:#1463ff}
.secondary,.logout{background:#fff!important;color:#172033!important;border-color:#c7d2df!important}
.error{min-height:20px;color:#b42318;margin:0}
.workspace{height:100vh;display:grid;grid-template-columns:286px minmax(0,1fr) 330px;background:#f4f6f8}
.rail{background:#111827;color:#e7edf5;display:grid;grid-template-rows:auto auto 1fr auto;gap:14px;padding:16px;min-width:0}
.rail nav{overflow:auto;display:grid;align-content:start;gap:6px}
.rail h2{margin:14px 0 4px;color:#9fb0c4;font-size:12px;text-transform:uppercase}
.compose,.logout{width:100%}
.chat-btn{width:100%;display:grid;grid-template-columns:34px minmax(0,1fr) auto;gap:10px;align-items:center;background:transparent;color:#e7edf5;border:0;text-align:left;padding:9px;border-radius:7px}
.chat-btn:hover,.chat-btn.active{background:#243244}
.chat-btn strong,.chat-btn small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.chat-btn small,.muted{color:#9fb0c4;font-size:12px}
.chat-btn b{background:#1463ff;color:#fff;border-radius:999px;font-size:11px;padding:3px 7px}
.avatar{width:34px;height:34px;border-radius:7px;background:#1463ff;color:#fff;display:grid;place-items:center;font-weight:900;flex:0 0 auto}
.avatar.large{width:50px;height:50px;font-size:18px}
.chat{display:grid;grid-template-rows:auto 1fr auto;min-width:0;border-right:1px solid #d9e1ea}
.chat-head{display:flex;justify-content:space-between;gap:14px;align-items:center;padding:16px 18px;background:#fff;border-bottom:1px solid #d9e1ea}
.chat-head h1{margin:0;font-size:24px}
.chat-head p{margin:4px 0 0;color:#627086}
.head-actions{display:flex;gap:8px;align-items:center}
.head-actions input{width:220px}
.messages{overflow:auto;padding:18px;display:grid;align-content:start;gap:12px}
.message{display:flex}
.message.mine{justify-content:flex-end}
.bubble{width:min(660px,82%);background:#fff;border:1px solid #d9e1ea;border-radius:8px;padding:11px 12px;box-shadow:0 10px 24px #16243a0d}
.mine .bubble{background:#eaf2ff;border-color:#c8dbff}
.bubble header{display:flex;justify-content:space-between;gap:12px;font-size:12px;color:#627086}
.bubble p{margin:8px 0;line-height:1.45;white-space:pre-wrap}
.bubble footer{display:flex;gap:7px;align-items:center;flex-wrap:wrap}
.bubble footer button{font-size:12px;padding:4px 7px}
.bubble small,.file{font-size:12px;color:#627086}
.file{display:inline-flex;border:1px solid #c8d3df;border-radius:999px;padding:4px 8px}
.message-form{display:grid;grid-template-columns:minmax(0,1fr) 210px auto;gap:8px;padding:12px;background:#fff;border-top:1px solid #d9e1ea}
.context{overflow:auto;padding:16px;display:grid;align-content:start;gap:14px}
.me{display:flex;align-items:center;gap:11px;background:#fff;border:1px solid #d9e1ea;border-radius:8px;padding:12px}
.me strong,.me small,.person strong,.person small{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.me small,.person small,.activity span{color:#627086;font-size:12px}
.metrics{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
.metrics div{background:#fff;border:1px solid #d9e1ea;border-radius:8px;padding:10px;display:grid;gap:4px}
.metrics strong{font-size:22px}
.metrics small{color:#627086;font-size:12px}
.panel{padding:13px;display:grid;gap:10px}
.panel h2{margin:0;font-size:15px}
.person{display:flex;align-items:center;gap:9px;min-width:0}
.activity{border-top:1px solid #edf1f5;margin:0;padding-top:10px;line-height:1.35}
.empty-pane{display:grid;place-items:center;height:100%;color:#627086}
.empty-row{color:#627086;text-align:center;padding:28px}
.status{position:fixed;left:286px;right:330px;bottom:0;background:#ffffffee;border-top:1px solid #d9e1ea;color:#627086;font-size:12px;padding:5px 10px}
.modal{position:fixed;inset:0;background:#11182799;display:grid;place-items:center;padding:18px}
.modal-card{width:min(580px,100%);padding:16px;display:grid;gap:12px}
.modal-card header{display:flex;justify-content:space-between;align-items:center}
.modal-card h2{margin:0}
.people{max-height:190px;overflow:auto;border:1px solid #d9e1ea;border-radius:8px;padding:8px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.people label{display:flex;align-items:center;gap:8px}
.people input{width:auto}
@media(max-width:1050px){.workspace{grid-template-columns:250px minmax(0,1fr)}.context{display:none}.status{right:0;left:250px}}
@media(max-width:760px){.workspace{height:auto;min-height:100vh;grid-template-columns:1fr}.rail{grid-template-rows:auto auto auto auto}.rail nav{max-height:260px}.chat{min-height:70vh}.chat-head,.head-actions{display:grid}.head-actions input{width:100%}.message-form{grid-template-columns:1fr}.status{left:0}.bubble{width:100%}}