:root{color-scheme:light dark;--brand-primary:#FF6B8A;--brand-primary-soft:#FFE1E8;--brand-secondary:#9B8CFF;--bg:#FAFAFC;--surface:#F2F2F6;--surface-elevated:#FFFFFF;--text-primary:#1A1A1A;--text-secondary:#6B6B70;--text-tertiary:#9A9AA0;--bubble-user-bg:linear-gradient(135deg,#7DD36A,#5DB34B);--bubble-user-text:#FFFFFF;--bubble-character:#FFFFFF;--bubble-system:#EDEDF0;--line-room-bg:#8EAED8;--line-header-bg:#8EAED8;--line-header-text:#102235;--line-search-bg:#F2F3F5;--divider:#E4E4EB;--error:#FF3B30;--shadow-soft:0 1px 2px rgba(0,0,0,0.04),0 4px 12px rgba(0,0,0,0.04);--brand-gradient:linear-gradient(135deg,var(--brand-primary),var(--brand-secondary))}@media (prefers-color-scheme:dark){:root{--brand-primary:#FF8FA3;--brand-primary-soft:#3A2530;--brand-secondary:#B5AAFF;--bg:#0E0E12;--surface:#1A1A22;--surface-elevated:#24242E;--text-primary:#F2F2F2;--text-secondary:#A0A0A8;--text-tertiary:#707078;--bubble-user-bg:linear-gradient(135deg,#5DB34B,#3E8F30);--bubble-user-text:#FFFFFF;--bubble-character:#2A2A34;--bubble-system:#30303A;--line-room-bg:#384A62;--line-header-bg:#384A62;--line-header-text:#F2F7FF;--line-search-bg:#2A2A34;--divider:#2A2A34;--error:#FF453A;--shadow-soft:0 1px 2px rgba(0,0,0,0.3),0 4px 12px rgba(0,0,0,0.2)}}*{box-sizing:border-box}body,html{margin:0;padding:0;background:var(--bg);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Hiragino Kaku Gothic ProN,Hiragino 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