:root{--paper:#f7f8fa;--surface:#fff;--ink:#14171c;--mute:#707987;--line:#e3e6eb;--accent:#2b8cff;--dark:#14171c;--dark-soft:#1c2027;--dark-line:#323843;--font-sans:"Space Grotesk", "Microsoft YaHei", sans-serif;--font-mono:"JetBrains Mono", "Microsoft YaHei", monospace;--shell:min(1440px, calc(100vw - 8vw));--ease:cubic-bezier(.22, 1, .36, 1)}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;background:var(--paper);scroll-padding-top:84px}body{background:var(--paper);min-width:320px;color:var(--ink);font-family:var(--font-sans);letter-spacing:0;text-rendering:optimizelegibility;font-size:16px;line-height:1.65;overflow:clip 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