:root{--paper: #f6f5f1;--card: #ffffff;--ink: #1a1917;--chalk: #8e8b82;--iron: #e5e2da;--iron-strong: #cfccc2;--muscle: #d8402c;--muscle-dark: #b23322;--muscle-soft: #fbe9e5;--ok: #2f7d4f;--display: "Archivo Black", "Arial Black", sans-serif;--mono: "JetBrains Mono", "Consolas", monospace;--body: -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--paper);color:var(--ink);font-family:var(--body);font-size:15px;line-height:1.55;-webkit-font-smoothing:antialiased}img{display:block}button{font-family:var(--body);cursor:pointer}@media(prefers-reduced-motion:reduce){*,*:before,*:after{transition:none!important;animation:none!important}}.topbar{position:sticky;top:0;z-index:20;background:var(--paper);border-bottom:1px solid var(--iron)}.topbar-inner{max-width:1180px;margin:0 auto;padding:14px 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