*{box-sizing:border-box}body{margin:0;background:#f4faf9;color:#173d42;font:16px system-ui}header{display:flex;align-items:center;justify-content:space-between;padding:12px 24px;background:white}h1{font-size:24px;display:flex;align-items:center;gap:10px}.header-actions{display:flex;gap:16px;align-items:center}.header-actions svg{width:28px;height:28px}main{max-width:1100px;margin:auto;padding:20px}.notice{font-size:13px;color:#536b6d}.layout{display:grid;grid-template-columns:300px 1fr;gap:20px}aside,section{background:white;padding:20px;border-radius:18px;min-width:0}h2{font-size:18px}input:not([type=checkbox]){width:100%;padding:12px;border:1px solid #aac9c9;border-radius:10px;margin:8px 0}button{cursor:pointer;border:0;background:#087f8c;color:white;border-radius:10px;padding:10px 14px;margin:4px}details{margin:16px 0}#rooms button{display:block;width:100%;text-align:left}#messages{height:380px;overflow:auto;display:flex;flex-direction:column;gap:10px;padding:10px 0}.message{background:#edf4f4;border-radius:12px;padding:10px;max-width:90%;white-space:pre-wrap;overflow-wrap:anywhere}.message.mine{align-self:flex-end;background:#d7f3e9}.message small{display:block;font-size:11px;color:#536b6d}#compose{display:flex;gap:5px}#compose[hidden]{display:none}#members{font-size:12px;overflow-wrap:anywhere}#status{color:#975010;min-height:24px}@media(max-width:700px){.layout{grid-template-columns:1fr}header{padding:8px 16px}main{padding:12px}}