:root{--bg:#f4f6f8;--ink:#152638;--muted:#6e7f90;--line:#e3e9ed;--teal:#147b78;--nav:#142a36;--accent:#d5efeb;--red:#af3947}*{box-sizing:border-box}body{color:var(--ink);background:var(--bg);margin:0;font:14px/1.6 Segoe UI,Microsoft YaHei,sans-serif}button,input,select,textarea{font:inherit}button,a,input,select,textarea{outline-offset:3px}a{color:var(--teal);text-decoration:none}button{cursor:pointer;border:1px solid var(--line);color:var(--ink);background:#fff;border-radius:7px;padding:8px 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