:root{--bg:#fff;--ink:#191917;--muted:#66645f;--line:#e4e1d9;--accent:#b7472f;--soft:#f8f8f6;--green:#267057;--width:1240px;color-scheme:light;font-synthesis:none}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:105px}body{margin:0;background:var(--bg);color:var(--ink);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.75}button,input,select,textarea{font:inherit}a{color:inherit;text-decoration:none}button{cursor:pointer}button:disabled{cursor:wait}button,a,input,textarea,select{touch-action:manipulation}:focus-visible{outline:2px solid var(--accent);outline-offset:5px}::selection{background:#f1d8cf}.wrap{width:min(calc(100% - 80px),var(--width));margin:auto}.skip{position:fixed;top:-60px;left:12px;background:#fff;z-index:100;padding:10px}.skip:focus{top:8px}.site-header{background:rgba(255,255,255,.97);position:sticky;top:0;z-index:20;border-bottom:1px solid 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