:root{--paper:#fbfaf7;--ink:#1d1c19;--ink-2:#605e57;--rule:#dad8d0;--rule-2:#1d1c19;--wash:#eef1ea;--up:#c62828;--down:#2e7d32;--pitch:28px;--data:17px;--qr:6rem;--sans:system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;--dot:var(--sans)}*{box-sizing:border-box}html{background:var(--paper);-webkit-text-size-adjust:100%}body{font:16px/var(--pitch) var(--sans);color:var(--ink);margin:0}::selection{background:var(--wash);color:var(--ink)}:focus-visible{outline:2px dashed var(--ink);outline-offset:2px}.page{max-width:44rem;padding:0 1.25rem calc(var(--pitch) * 2);margin:0 auto}.head{padding:var(--pitch) 0 0;margin-bottom:var(--pitch);border-bottom:1px solid var(--rule-2);flex-wrap:wrap;justify-content:space-between;align-items:baseline;gap:0 1rem;display:flex}.brand{font:700 20px/0 var(--sans);color:var(--ink);text-decoration:none}.brand img{width:auto;max-width:none;height:var(--pitch);line-height:var(--pitch);vertical-align:-7px}.head nav{flex-wrap:wrap;gap:0 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