:root{color-scheme:light;--bg:linear-gradient(160deg,#e0f2fe,#eff6ff 40%,#faf5ff);--bg-soft:hsla(0,0%,100%,.85);--panel:hsla(0,0%,100%,.95);--panel-border:hsla(0,0%,100%,.6);--text-primary:#1f2937;--text-muted:#5a6b7c;--text-soft:#8492a6;--accent:#4f46e5;--accent-soft:rgba(79,70,229,.1);--accent-red:#ef4444;--chip-bg:#fff;--chip-border:rgba(79,70,229,.2);--sidebar-bg:hsla(0,0%,100%,.7);--sidebar-border:hsla(0,0%,100%,.4);--shadow-soft:0 10px 40px rgba(79,70,229,.05);--user-msg-bg:#fff;--bot-msg-bg:#fff;--error-bg:#fef2f2;--error-border:#fecaca;--error-text:#991b1b;--error-accent:#dc2626;--radius-sm:6px;--radius-md:12px;--radius-lg:18px;--radius-pill:9999px}.dark{color-scheme:dark;--bg:#0f172a;--bg-soft:rgba(15,23,42,.95);--panel:#1e293b;--panel-border:#334155;--text-primary:#f1f5f9;--text-muted:#94a3b8;--text-soft:#64748b;--accent:#22c55e;--accent-soft:rgba(34,197,94,.15);--accent-red:#f87171;--chip-bg:#1e293b;--chip-border:rgba(34,197,94,.3);--sidebar-bg:rgba(15,23,42,.9);--sidebar-border:#334155;--shadow-soft:0 10px 40px rgba(0,0,0,.3);--user-msg-bg:#1e293b;--bot-msg-bg:#1e293b;--error-bg:hsla(0,86%,97%,.1);--error-border:#7f1d1d;--error-text:#fca5a5;--error-accent:#f87171}