*{box-sizing:border-box}body{margin:0;font:15px "Microsoft YaHei",sans-serif;color:#1d293b;background:#f2f5f9}button{cursor:pointer;border:0;border-radius:6px;padding:9px 14px;background:#2563eb;color:white}button:hover{background:#1d4ed8}input,textarea{font:inherit;border:1px solid #ccd5e2;border-radius:6px;padding:10px}#login{height:100vh;display:grid;place-items:center}#login[hidden],#app[hidden]{display:none}#login form{width:340px;background:white;padding:32px;border-radius:12px;box-shadow:0 8px 30px #1d293b15}label{display:block;margin:18px 0}label input{display:block;width:100%;margin-top:6px}#login button{width:100%}#loginError{color:#bd3030}main{height:100vh;display:flex}aside{width:280px;background:#fff;border-right:1px solid #e0e6ef;display:flex;flex-direction:column}header{height:74px;padding:16px 22px;border-bottom:1px solid #e0e6ef;display:flex;align-items:center;justify-content:space-between}aside header strong{font-size:22px;color:#2563eb}.sidehead{padding:20px;display:flex;align-items:center;justify-content:space-between}h2{font-size:16px;margin:0}nav{overflow:auto;padding:0 12px}nav button{display:block;width:100%;text-align:left;background:transparent;color:#344054;margin-bottom:4px;overflow:hidden;text-overflow:ellipsis}nav button.active{background:#eaf1ff;color:#1d4ed8}.chat{flex:1;min-width:0;display:flex;flex-direction:column}.chat header{background:white}#status{font-size:12px;color:#27805c}#status.offline{color:#bc422e}#messages{flex:1;overflow:auto;padding:24px}.message{background:white;border:1px solid #e5ebf2;border-radius:8px;padding:14px;margin:0 auto 12px;max-width:900px}.meta{display:flex;gap:12px;align-items:center;color:#65758a;font-size:12px}.meta strong{color:#27364b}.meta button{margin-left:auto;background:#eef3fb;color:#31598d;padding:5px 9px}pre{white-space:pre-wrap;overflow-wrap:anywhere;font:14px/1.6 Consolas,monospace;margin:12px 0 0}#sendForm{padding:16px 24px;background:white;border-top:1px solid #e0e6ef}textarea{width:100%;height:95px;resize:vertical}#sendForm div{display:flex;justify-content:space-between;align-items:center;color:#78879a;font-size:12px;margin-top:8px}

/* Position, labels and color together distinguish each side. */
#identity{font-size:12px;color:#65758a;margin-top:4px}
.message{width:fit-content;min-width:min(320px,100%);max-width:min(85%,900px);margin:0 0 16px;border-radius:12px;box-shadow:0 2px 5px #1d293b06}
.message-own{margin-left:auto;background:#eaf2ff;border-color:#bdd3f5;border-top-right-radius:3px}
.message-other{margin-right:auto;background:#fff;border-color:#d5dee9;border-top-left-radius:3px}
.message-own .meta strong{color:#174b98}
.message-other .meta strong{color:#344054}
.meta{flex-wrap:wrap;gap:8px}
.meta strong{overflow-wrap:anywhere}
.meta button{white-space:nowrap}
.message-own .meta button{background:#d5e5ff;color:#174b98}
.message pre{text-align:left;tab-size:4}
@media(max-width:800px){.message{max-width:96%}aside{width:230px;flex-shrink:0}}

[hidden]{display:none!important}
button:disabled{opacity:.5;cursor:not-allowed}
#screenPanel{background:#fff;border-bottom:1px solid #e0e6ef;padding:12px 24px;flex-shrink:0}
.screenToolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap}
#screenStatus{font-size:12px;color:#516580;display:inline-block;margin-left:12px}
.screenActions{display:flex;gap:8px}
#screenStop{background:#b42318}
.screenHint{font-size:12px;color:#65758a;margin:8px 0 0}
#screenMedia{margin-top:12px;position:relative;background:#111c2b;border-radius:8px;overflow:hidden}
#screenVideo{display:block;width:100%;height:32vh;min-height:150px;object-fit:contain}
.screenVideoActions{display:flex;justify-content:flex-end;gap:8px;padding:6px 12px}
.screenVideoActions button{background:#263a55;font-size:12px;padding:5px 10px}
#screenVideo:fullscreen{height:100vh;background:#111c2b}
#messages{min-height:100px}