:root{--brand:#ffbc00;--brand-dark:#e5a800;--brand-deep:#c98f00;--accent:#ff8814;--ink:#212121;--ink-2:#3d3d3d;--muted:#767676;--line:#e8e8e8;--bg:#fff;--bg-soft:#f7f7f7;--bg-dark:#1c1c1c;--radius:4px;--wrap:1200px;--font:"Microsoft YaHei", "PingFang SC", "Hiragino Sans GB", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif}*{box-sizing:border-box}html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}body{font-family:var(--font);color:var(--ink);background:var(--bg);margin:0;font-size:15px;line-height:1.75}img{max-width:100%;height:auto;display:block}a{color:var(--ink);text-decoration:none;transition:color .18s}a:hover{color:var(--brand-deep)}h1,h2,h3,h4{margin:0 0 .6em;font-weight:700;line-height:1.35}h1{font-size:34px}h2{font-size:28px}h3{font-size:19px}p{margin:0 0 1em}.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 20px}.topbar{background:var(--bg-dark);color:#bbb;font-size:13px;line-height:34px}.topbar 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