:root{--bg: #f6f7f9;--card: #fff;--text: #1c2330;--muted: #6b7482;--line: #e3e6eb;--brand: #1f6feb;--brand-text: #fff;--danger: #d1242f;--warn-bg: #fff4e5;--warn-line: #f0b25e;--ok: #1a7f37;--alert-bg: #eef4ff}@media (prefers-color-scheme: dark){:root{--bg: #12151b;--card: #1b2029;--text: #e8ebf0;--muted: #98a1b0;--line: #2d3441;--brand: #4c8dff;--brand-text: #0b1220;--danger: #ff6b6b;--warn-bg: #3a2d17;--warn-line: #a8742a;--ok: #4cc26b;--alert-bg: #172338}}*{box-sizing:border-box}html,body{margin:0;background:var(--bg);color:var(--text);font:16px/1.5 system-ui,-apple-system,PingFang SC,Noto Sans SC,sans-serif}h1,h2,h3{margin:0;line-height:1.25}h2{font-size:1.35rem}h3{font-size:1.05rem}a{color:var(--brand);text-decoration:none}code{background:var(--line);padding:1px 5px;border-radius:4px}pre{margin:0}.shell{max-width:1040px;margin:0 auto;padding:0 16px calc(24px + 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