:root{--ink:#17211c;--muted:#65716a;--paper:#f4f7f5;--white:#fff;--green:#177a50;--lime:#dff56b;--line:#d9e1dc;--red:#d94d3f;--shadow:0 16px 44px rgba(23,33,28,.08)}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:"Microsoft YaHei","PingFang SC",Arial,sans-serif;line-height:1.65;letter-spacing:0}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a{cursor:pointer}.skip-link{position:fixed;top:-60px;left:16px;z-index:100;background:var(--ink);color:#fff;padding:10px 16px}.skip-link:focus{top:12px}.site-header{height:76px;display:flex;align-items:center;justify-content:space-between;padding:0 max(24px,5vw);background:rgba(244,247,245,.94);border-bottom:1px solid 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