:root{--blue:#0038c8;--ink:#0b0b0c;--paper:#f4f4f1;--white:#fff;--line:#d7d7d0;--muted:#6e6e6a;--green:#c9f04a;--side:250px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,"PingFang SC","Microsoft YaHei",Arial,sans-serif;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font:inherit}.side{position:fixed;inset:0 auto 0 0;width:var(--side);padding:30px 24px 24px;background:var(--blue);color:#fff;display:flex;flex-direction:column;z-index:20}.logo{width:154px;margin-bottom:50px}.side-label,.eyebrow,.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:10px;letter-spacing:.14em;text-transform:uppercase}.side-label{margin:0 0 14px;color:rgba(255,255,255,.5)}.side-nav{display:grid;gap:4px}.side-nav a{padding:12px 13px;border:1px solid transparent;color:rgba(255,255,255,.68);font-size:13px;line-height:1.35}.side-nav a:hover,.side-nav 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@media(max-width:980px){:root{--side:0px}.side{display:none}.page{margin-left:0}.article{grid-template-columns:1fr}.aside{display:none}.hero{grid-template-columns:1fr}.hero-meta{max-width:500px;margin-top:25px}}
@media(max-width:640px){.top{padding:0 18px}.top strong,.top>span{display:none}.top-actions .action:not(.primary){display:none}.hero{padding:58px 20px}.hero h1{font-size:46px}.article{padding:60px 20px 70px}.grid,.checklist{grid-template-columns:1fr}.course-nav{grid-template-columns:1fr}.course-nav a+a{border-left:0;border-top:1px solid var(--line);text-align:left}.footer{align-items:flex-start;flex-direction:column}.footer a{margin-left:0}}
@media print{.side,.top,.aside,.course-nav,.footer,.copy-btn{display:none!important}.page{margin:0}.hero{padding:40px;color:#000;background:#fff;border-bottom:2px solid #000}.hero p,.hero .eyebrow{color:#333}.article{display:block;padding:40px}.content section{break-inside:avoid}.template{background:#fff;color:#000;border:1px solid #000}.template pre{color:#000}}