:root{--bg:#ffffff;--panel:#ffffff;--tint:#f7f9fc;--ink:#12141a;--muted:#6a7480;--line:#e6eaef;--accent:#2563eb;--accent-deep:#1d4ed8;--accent-soft:#eff5ff;--accent-line:#bfd6fe;--climb-bg:#fff4e6;--descent-bg:#e8faef;--up:#c2610c;--down:#0b8a4b;--tile-a:#1c2a4a;--tile-b:#0e1320;--night:#0b0f1a;--radius:10px;--mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,monospace}.logo-tile{display:inline-grid;place-items:center;flex:none}.logo-tile--dark{background:linear-gradient(158deg,var(--tile-a) 0,var(--tile-b) 100%)}.logo-tile--accent{background:var(--accent)}*{box-sizing:border-box}body,html{margin:0;padding:0}body{background:var(--bg);color:var(--ink);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;font-size:16px;line-height:1.5;-webkit-font-smoothing:antialiased}.shell{max-width:940px;margin:0 auto;padding:0 12px}.site-header{position:-webkit-sticky;position:sticky;top:0;z-index:20;background:rgba(255,255,255,.9);-webkit-backdrop-filter:saturate(180%) 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