:root{color-scheme:light;--brand: #660874;--brand-hover: #52085e;--brand-strong: #43064d;--brand-soft: #f4edf6;--brand-border: #d8bfde;--brand-muted: #916299;--canvas: #f5f6f8;--surface: #ffffff;--surface-subtle: #f8f9fb;--surface-muted: #eef0f4;--text-primary: #252331;--text-secondary: #5e5c6c;--text-muted: #6e6b7c;--border: #e1e3e9;--border-strong: #b8bac7;--success: #18704c;--success-soft: #e9f5ee;--warning: #806016;--warning-soft: #fcf4dd;--attention: #a34b19;--attention-soft: #fff0e6;--danger: #b0303f;--danger-soft: #fceef0;--info: #285f93;--info-soft: #eaf2fa;--neutral: #626575;--neutral-soft: #eff0f4;--subject-math: #285f93;--subject-math-soft: #eaf2fa;--subject-chinese: #a44830;--subject-chinese-soft: #fcf0e9;--subject-english: #18715e;--subject-english-soft: #e7f5ef;--surface-dark: #28192f;--surface-dark-inset: #1e1225;--on-dark: #ffffff;--on-dark-muted: #d6c8db;--chart-grid-dark: #614a6c;--chart-label-dark: #d6c8db;--chart-accent: #e4b5ec;--chart-success: 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