:root{--ink:#15231f;--muted:#64736e;--paper:#f7f8f4;--card:#fff;--line:#dce3de;--green:#146c50;--lime:#dfff73;--blue:#2457d6;--orange:#b64f19;--code:#12201c}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:84px}body{margin:0;background:var(--paper);color:var(--ink);font:15px/1.7 ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC",sans-serif}.topbar{position:sticky;top:0;z-index:20;height:64px;display:flex;align-items:center;gap:32px;padding:0 34px;background:rgba(247,248,244,.94);border-bottom:1px solid var(--line);backdrop-filter:blur(16px)}.brand{display:flex;align-items:center;gap:10px;color:var(--ink);font-weight:800;text-decoration:none;letter-spacing:-.02em}.brand-mark{display:grid;place-items:center;width:30px;height:30px;border-radius:9px;background:var(--ink);color:var(--lime)}.topbar nav{display:flex;gap:24px;margin-left:auto}.topbar nav a,.spec-link{color:var(--muted);text-decoration:none;font-size:13px;font-weight:650}.topbar nav 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