*,*:before,*:after{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:#e2e8f0}.bc-shell{min-height:100vh;display:flex;align-items:stretch;justify-content:center;padding:1.5rem;background:linear-gradient(160deg,var(--bc-bg, #f8fafc),#e2e8f0);color:var(--bc-text, #0f172a)}.bc-card{width:min(560px,100%);background:#fff;border-radius:16px;box-shadow:0 10px 40px #0f172a14;display:flex;flex-direction:column;overflow:hidden}.bc-header{display:flex;gap:.75rem;padding:1.25rem 1.25rem .5rem;align-items:center}.bc-logo{width:48px;height:48px;object-fit:contain;border-radius:8px}.bc-logo-placeholder{width:48px;height:48px;border-radius:8px;background:var(--bc-primary, #2563eb);opacity:.35}.bc-title{margin:0;font-size:1.15rem;line-height:1.3}.bc-sub{margin:.2rem 0 0;font-size:.9rem;color:#64748b}.bc-meta{display:grid;grid-template-columns:1fr 1fr;gap:.75rem;padding:0 1.25rem 1rem;font-size:.85rem;border-bottom:1px solid #e2e8f0}.bc-label{display:block;font-size:.7rem;text-transform:uppercase;letter-spacing:.04em;color:#94a3b8;margin-bottom:.15rem}.bc-messages{flex:1;min-height:220px;max-height:48vh;overflow:auto;padding:1rem 1.25rem;display:flex;flex-direction:column;gap:.6rem;background:#f8fafc}.bc-msg{padding:.65rem .85rem;border-radius:12px;max-width:92%;line-height:1.45;font-size:.95rem;white-space:pre-wrap}.bc-msg-user{align-self:flex-end;background:var(--bc-primary, #2563eb);color:#fff}.bc-msg-assistant{align-self:flex-start;background:#fff;border:1px solid #e2e8f0;color:var(--bc-text, #0f172a)}.bc-form{display:flex;flex-wrap:wrap;gap:.5rem;padding:.85rem 1.25rem 1.25rem;border-top:1px solid #e2e8f0;background:#fff}.bc-input{flex:1 1 160px;min-width:0;padding:.65rem .75rem;border-radius:10px;border:1px solid #cbd5e1;font:inherit}.bc-input:focus{outline:2px solid color-mix(in srgb,var(--bc-primary, #2563eb) 55%,white);border-color:transparent}.bc-btn{padding:.65rem 1rem;border-radius:10px;border:none;font:inherit;font-weight:600;cursor:pointer;background:var(--bc-primary, #2563eb);color:#fff}.bc-btn:disabled{opacity:.55;cursor:not-allowed}.bc-btn-secondary{background:#e2e8f0;color:#0f172a}.bc-muted{color:#64748b;margin:0}