:root{--ink:#243c35;--muted:#718077;--paper:#fcfcf8;--bg:#f3f5ef;--line:#dce3d8;--green:#245b46;--light:#e8efe3;--amber:#8b642d}*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--ink);font:15px/1.75 "Segoe UI","Microsoft YaHei",sans-serif}button,input,select,textarea{font:inherit}button,a,input,select,summary,textarea{outline-offset:4px}button,a,summary{touch-action:manipulation}a{color:var(--green);text-underline-offset:4px}button{cursor:pointer}button:disabled{cursor:wait;opacity:.6}.site-header{height:90px;display:flex;justify-content:space-between;align-items:center;padding:0 5vw;border-bottom:1px solid var(--line);background:#f7f8f2}.brand{display:flex;gap:12px;align-items:center;text-decoration:none;color:var(--ink);font-size:22px;font-weight:600;line-height:1.3}.brand-mark{width:43px;height:43px;display:grid;place-items:center;background:var(--green);color:#fff;border-radius:12px;font-family:Georgia,"SimSun",serif;font-size:27px;font-weight:400}.brand 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