:root{font-family:IBM Plex Sans,Segoe UI,sans-serif;color:#1b1b1f;background:radial-gradient(circle at top,#eef8ff,#f7f9fb 48%,#fff)}*{box-sizing:border-box}body{margin:0}.app-shell{max-width:1100px;margin:0 auto;padding:24px}.topbar h1{margin:0;font-size:1.8rem}.topbar p{margin:8px 0 20px;color:#4b5563}.panel{background:#fff;border:1px solid #e5e7eb;border-radius:14px;padding:18px;box-shadow:0 8px 24px #1018280f}label{display:block;margin-bottom:12px;font-weight:600}input{width:100%;border:1px solid #d1d5db;border-radius:10px;padding:10px 12px;margin-top:6px}button{border:none;border-radius:10px;padding:10px 16px;font-weight:700;background:#0f6fff;color:#fff;cursor:pointer}button:disabled{opacity:.6;cursor:not-allowed}.muted{color:#6b7280;font-size:.92rem}.error{margin-bottom:14px;background:#fee2e2;color:#991b1b;border:1px solid #fecaca;padding:10px 12px;border-radius:10px;cursor:pointer}.chat-layout{display:grid;grid-template-columns:2fr 1fr;gap:16px}.chat-panel{display:flex;flex-direction:column;min-height:560px}.chat-header{display:flex;justify-content:space-between;align-items:center}.status{padding:4px 10px;border-radius:999px;font-size:.78rem;font-weight:700}.status.online{background:#dcfce7;color:#166534}.status.offline{background:#f3f4f6;color:#374151}.messages{border:1px solid #e5e7eb;border-radius:12px;padding:12px;margin:14px 0;flex:1;overflow:auto;background:#f9fafb}.msg{max-width:78%;margin-bottom:10px;padding:10px 12px;border-radius:10px;background:#fff}.msg.guest{margin-left:auto;background:#dbeafe}.msg.host{margin-right:auto;background:#ecfccb}.msg-meta{font-size:.74rem;color:#4b5563;margin-bottom:4px}.send-row{display:flex;gap:10px}.send-row input{margin:0}.convert-form{display:grid}@media (max-width: 900px){.chat-layout{grid-template-columns:1fr}}