:root{--ink:#182320;--paper:#f5f3eb;--wash:#e8ede5;--acid:#cdf51c;--line:#bec8be;--muted:#65716b;--serif:Georgia,'Songti SC','SimSun',serif;--sans:'Microsoft YaHei UI','Microsoft YaHei',Arial,sans-serif;--mono:Consolas,'Courier New',monospace}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);line-height:1.55}.skip-link{position:fixed;top:-60px;left:20px;padding:10px;background:#fff;color:#000;z-index:9}.skip-link:focus{top:10px}.site-header{height:74px;display:flex;align-items:center;justify-content:space-between;padding:0 clamp(20px,5vw,76px);border-bottom:1px solid var(--line);font-size:13px}.brand{display:flex;gap:10px;align-items:center;color:inherit;text-decoration:none;font-family:var(--mono);letter-spacing:.05em;font-weight:500}.brand-mark{display:grid;place-items:center;width:26px;height:26px;border:1.5px solid 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