:root{--bg:#f3f1ec;--paper:#fcfbf8;--ink:#20231f;--muted:#656a63;--orange:#b94d20;--line:#dcded6;--dark:#20231f}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;color:var(--ink);background:var(--bg);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif}a{color:inherit}button,a,input{touch-action:manipulation}a:focus-visible,summary:focus-visible{outline:3px solid var(--orange);outline-offset:5px}header{position:sticky;top:0;z-index:5;background:#f3f1ecf5;border-bottom:1px solid var(--line)}.bar{max-width:1240px;margin:auto;padding:18px 32px;display:flex;justify-content:space-between;align-items:center;gap:20px}.brand{text-decoration:none;font-weight:800;font-size:19px;display:flex;align-items:center;gap:10px}.brand b{display:grid;place-items:center;width:36px;height:36px;border-radius:9px;background:var(--dark);color:#f38a50}.bar nav{display:flex;gap:24px;font-size:13px}.bar nav 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