:root{--nia-font:"Sora","Inter","Segoe UI",system-ui,-apple-system,sans-serif;--nia-primary-a:#4f5dff;--nia-primary-b:#7f96ff;--nia-accent:#ffd166;--nia-bg:rgba(255,255,255,0.96);--nia-panel:rgba(255,255,255,0.92);--nia-border:rgba(35,46,87,0.1);--nia-border-strong:rgba(35,46,87,0.18);--nia-text:#17203c;--nia-muted:#6c779d;--nia-shadow:0 28px 48px rgba(55,74,136,0.18);--nia-bubble-bot:rgba(239,244,255,0.9);--nia-bubble-user:linear-gradient(140deg,#4f5dff,#7f96ff);--nia-radius-lg:24px;--nia-radius:18px;--nia-radius-sm:12px}@media (prefers-color-scheme:dark){:root{--nia-bg:rgba(18,24,44,0.9);--nia-panel:rgba(24,30,52,0.94);--nia-border:rgba(255,255,255,0.08);--nia-border-strong:rgba(255,255,255,0.16);--nia-text:#f6f7ff;--nia-muted:#aeb7d6;--nia-shadow:0 38px 60px rgba(5,9,24,0.55);--nia-bubble-bot:rgba(59,68,104,0.55);--nia-bubble-user:linear-gradient(140deg,#5b6aff,#8ba3ff)}}.nia-shell{position:fixed;bottom:clamp(16px,4vw,20px);right:clamp(12px,3vw,32px);z-index:1100;font-family:var(--nia-font);color:var(--nia-text)}.card.frame{width:min(360px,88vw);max-height:80vh;display:grid;grid-template-rows:auto 1fr auto;background:var(--nia-panel);border-radius:var(--nia-radius-lg);border:1px solid var(--nia-border);box-shadow:var(--nia-shadow);backdrop-filter:blur(28px) saturate(150%);overflow:hidden}header{position:relative;display:flex;align-items:center;gap:16px;padding:20px 22px 18px;background:rgba(255,255,255,.85);border-bottom:1px solid var(--nia-border)}@media (prefers-color-scheme:dark){header{background:rgba(30,36,60,.92)}}header:after{content:"";position:absolute;inset:auto 0 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