body{margin:0;font-family:Georgia,serif;background:linear-gradient(180deg,#e8edf5 0%,#f7f8fb 100%);color:#172033}
.lt-shell{max-width:1100px;margin:0 auto;min-height:100vh;display:grid;grid-template-columns:1fr 420px;gap:40px;padding:48px 24px}
.lt-hero{padding-top:56px}
.lt-kicker{display:inline-block;font:700 11px/1.2 system-ui,sans-serif;letter-spacing:.18em;text-transform:uppercase;color:#5f6c86}
.lt-hero h1{font-size:56px;line-height:.96;margin:16px 0 14px}
.lt-hero p{font-size:18px;line-height:1.6;max-width:48ch;color:#47546d}
.lt-chat{background:#fff;border:1px solid #d8e0eb;border-radius:24px;box-shadow:0 20px 50px rgba(22,32,51,.08);padding:18px;display:flex;flex-direction:column;height:78vh}
.lt-chat-head{display:flex;justify-content:space-between;gap:12px;align-items:flex-start;padding-bottom:12px;border-bottom:1px solid #e7ecf3}
.lt-sub{font:12px/1.4 system-ui,sans-serif;color:#64748b;margin-top:4px}
.lt-link{background:none;border:0;color:#0f1f3d;font:600 12px/1 system-ui,sans-serif;cursor:pointer}
.lt-pref{padding:12px 0 2px}
.lt-pref-label{display:block;font:11px/1.2 system-ui,sans-serif;text-transform:uppercase;letter-spacing:.12em;color:#64748b;margin-bottom:8px}
.lt-pref-buttons{display:flex;gap:8px;flex-wrap:wrap}
.lt-lead{display:grid;grid-template-columns:1fr;gap:8px;margin:14px 0}
.lt-lead input,.lt-form textarea{width:100%;box-sizing:border-box;border:1px solid #d8e0eb;border-radius:14px;padding:12px 14px;font:14px/1.4 system-ui,sans-serif;background:#fbfcfe}
.lt-msgs{flex:1;overflow:auto;display:flex;flex-direction:column;gap:10px;padding:8px 0}
.lt-msg{max-width:88%;padding:12px 14px;border-radius:18px;font:14px/1.5 system-ui,sans-serif;white-space:pre-wrap}
.lt-msg.visitor{align-self:flex-end;background:#0f1f3d;color:#fff}
.lt-msg.system{align-self:flex-start;background:#edf3ff;color:#162032}
.lt-meta{display:block;font-size:11px;opacity:.7;margin-top:6px}
.lt-actions{display:flex;gap:8px;flex-wrap:wrap;margin:8px 0 12px}
.lt-chip{border:1px solid #c9d4e5;background:#f6f9ff;border-radius:999px;padding:8px 12px;font:12px/1.2 system-ui,sans-serif;cursor:pointer}
.lt-chip.active{background:#0f1f3d;color:#fff;border-color:#0f1f3d}
.lt-form{display:flex;flex-direction:column;gap:10px}
.lt-form button{border:0;background:#0f1f3d;color:#fff;border-radius:14px;padding:12px 16px;font:600 14px/1 system-ui,sans-serif;cursor:pointer}
body.lt-embed{background:#fff}
body.lt-embed .lt-shell{max-width:none;min-height:100vh;display:block;padding:0}
body.lt-embed .lt-hero{display:none}
body.lt-embed .lt-chat{height:100vh;min-height:100vh;border:0;border-radius:0;box-shadow:none;padding:14px}
body.lt-public .lt-chat{height:80vh}
@media (max-width:960px){.lt-shell{grid-template-columns:1fr;padding:24px 16px}.lt-hero{padding-top:0}.lt-hero h1{font-size:40px}.lt-chat{height:auto;min-height:72vh}}