:root{--bg:#f5f6f8;--panel:#fff;--border:#dde1e6;--text:#1d2228;--muted:#6b7480;--accent:#2f6fde;--mine:#dce8fc;--error:#c62828;color:var(--text);background:var(--bg);font-family:system-ui,sans-serif;font-size:15px}*{box-sizing:border-box}body{margin:0}button{font:inherit;border:1px solid var(--accent);background:var(--accent);color:#fff;cursor:pointer;border-radius:6px;padding:6px 12px}button:disabled{opacity:.6;cursor:default}input,select,textarea{font:inherit;border:1px solid var(--border);border-radius:6px;width:100%;padding:6px 8px}.link-button{color:var(--accent);background:0 0;border:none;padding:0}.error{color:var(--error)}.status{color:var(--muted);padding:16px}.auth{justify-content:center;align-items:center;min-height:100vh;padding:16px;display:flex}.auth-form{background:var(--panel);border:1px solid var(--border);border-radius:10px;flex-direction:column;gap:12px;width:100%;max-width:360px;padding:24px;display:flex}.auth-form h1{margin:0;font-size:22px}.auth-form label{color:var(--muted);flex-direction:column;gap:4px;display:flex}.layout{grid-template-rows:auto 1fr;grid-template-columns:280px 1fr;height:100vh;display:grid}.topbar{background:var(--panel);border-bottom:1px solid var(--border);grid-column:1/-1;align-items:center;gap:16px;padding:8px 16px;display:flex}.brand{margin-right:auto;font-weight:600}.me{color:var(--muted)}.sidebar{background:var(--panel);border-right:1px solid var(--border);flex-direction:column;gap:12px;padding:12px;display:flex;overflow-y:auto}.chat-list,.user-picker{flex-direction:column;gap:2px;display:flex}.chat-item,.user-item{color:var(--text);text-align:left;background:0 0;border:none;border-radius:6px;flex-direction:column;align-items:flex-start;padding:8px;text-decoration:none;display:flex}.chat-item:hover,.user-item:hover{background:var(--bg)}.chat-item.active{background:var(--mine)}.chat-name{font-weight:500}.chat-time,.user-email{color:var(--muted);font-size:12px}.invite-form{border-top:1px solid var(--border);flex-direction:column;gap:8px;margin-top:auto;padding-top:12px;display:flex}.invite-form h2{margin:0;font-size:15px}.chat{flex-direction:column;min-height:0;display:flex}.chat-title{border-bottom:1px solid var(--border);background:var(--panel);margin:0;padding:12px 16px;font-size:17px}.messages{flex-direction:column;flex:1;gap:6px;padding:16px;display:flex;overflow-y:auto}.message{background:var(--panel);border:1px solid var(--border);border-radius:8px;align-self:flex-start;max-width:70%;padding:6px 10px}.message.mine{background:var(--mine);align-self:flex-end}.message.pending{opacity:.7}.message-text{white-space:pre-wrap;overflow-wrap:anywhere;margin:0}.message-meta{color:var(--muted);font-size:11px}.composer{border-top:1px solid var(--border);background:var(--panel);grid-template-columns:1fr auto;gap:8px;padding:12px 16px;display:grid}.composer textarea{resize:none}.composer .error{grid-column:1/-1;margin:0}