:root{--ink:#101828;--muted:#667085;--line:#e8ecf6;--panel:rgba(255,255,255,.9);--green:#17b26a;--blue:#4f46e5;--amber:#f59e0b;--black:#344054;--code:#111827;--shadow:0 18px 45px rgba(38,45,118,.11);--radius:14px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;color:var(--ink);font-family:ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;background:radial-gradient(circle at 8% 0%,#dff8ec 0,transparent 30rem),radial-gradient(circle at 92% 0%,#fff0d0 0,transparent 28rem),linear-gradient(180deg,#f8fbff,#f6f8ff 55%,#fffaf3);line-height:1.65;letter-spacing:0}.topbar,.page{width:min(1120px,calc(100% - 32px));margin:auto}.topbar{padding:22px 0 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