*{box-sizing:border-box}html,body{margin:0;height:100%;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:#fff}#app{height:100%}.chat{display:flex;flex-direction:column;height:100%}.chat__messages{flex:1;overflow-y:auto;padding:12px;display:flex;flex-direction:column;gap:8px}.msg{max-width:80%;padding:8px 12px;border-radius:12px;font-size:.95rem;line-height:1.35;white-space:pre-wrap;word-break:break-word}.msg--visitor{align-self:flex-end;background:#2563eb;color:#fff;border-bottom-right-radius:4px}.msg--staff{align-self:flex-start;background:#f1f5f9;color:#0f172a;border-bottom-left-radius:4px}.msg--pending{opacity:.6}.msg--failed{outline:2px solid #dc2626}.chat__form{display:flex;gap:8px;padding:10px;border-top:1px solid #e2e8f0}.chat__input{flex:1;padding:10px 12px;border-radius:20px;border:1px solid #cbd5e1;font-size:1rem;min-width:0}.chat__send{padding:10px 16px;border-radius:20px;border:none;background:#2563eb;color:#fff;font-weight:600;cursor:pointer}.chat__status{margin:0;padding:4px 12px;font-size:.8rem;color:#64748b;min-height:1.2em}@media(max-width:480px){.msg{max-width:90%}}