:root{--bg:#ffffff;--surface:#ffffff;--surface-soft:#f4f7fb;--surface-blue:#edf2f8;--line:#e4e8ee;--line-strong:#d3dce8;--text:#242b35;--text-soft:#424c5a;--muted:#778292;--accent:#647fa6;--accent-dark:#4f688b;--accent-light:#eaf0f7;--content-wide:1040px;--content-reading:720px;--radius:12px}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;font-size:16px;line-height:1.75;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}a{color:inherit;text-decoration:none}a:hover{color:var(--accent-dark)}a:focus-visible{outline:3px solid #9cb1ce;outline-offset:4px;border-radius:4px}button,input,textarea,select{font:inherit}.site-header{position:relative;z-index:5;background:#fff;border-bottom:1px solid var(--line)}.header-inner{width:min(var(--content-wide), calc(100% - 48px));min-height:76px;margin:0 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