:root{--bg:#f6f8fb;--card:#ffffff;--ink:#0f172a;--muted:#6b7280;--line:#e5e7eb;--brand-1:#1d4ed8;--brand-2:#60a5fa;--ring:#93c5fd;--shadow:0 10px 30px rgba(29,78,216,.12);--soft-shadow:0 2px 10px rgba(15,23,42,.06);--radius:18px;--radius-sm:12px;--max:960px;--max-chat:860px;--gap:20px}@media (prefers-color-scheme:dark){:root{--bg:#0b1220;--card:#0f172a;--ink:#e5edf8;--muted:#9aa4b2;--line:#233148;--brand-1:#3b82f6;--brand-2:#60a5fa;--ring:#60a5fa;--shadow:0 10px 30px rgba(59,130,246,.18);--soft-shadow:0 2px 10px rgba(0,0,0,.35)}}*{box-sizing:border-box}body,html{height:100%}body{margin:0;font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;color:var(--ink);background:var(--bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}@media (max-width:900px){:root{--max-chat:92vw}}@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}:focus-visible{outline:2px solid var(--ring);outline-offset:2px;border-radius:10px}