:root { color-scheme: light; --ink: #203044; --muted: #536276; --link: #185a86; --line: #dbe2e9; --paper: #fff; --wash: #f4f7fa; }
* { box-sizing: border-box; }
html { scroll-padding-top: 1rem; }
body { margin: 0; color: var(--ink); background: var(--paper); font: 1.05rem/1.75 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; overflow-wrap: break-word; }
a { color: var(--link); text-underline-offset: .18em; }
a:hover { text-decoration-thickness: .12em; }
a:focus-visible, summary:focus-visible { outline: 3px solid #d08a15; outline-offset: 4px; }
.site-header { border-bottom: 1px solid var(--line); background: var(--wash); }
.header-inner { max-width: 78rem; margin: auto; padding: 1.2rem 1.5rem; }
.site-title { font-size: 1.4rem; font-weight: 750; color: var(--ink); text-decoration: none; }
.site-header nav { display: flex; flex-wrap: wrap; gap: .35rem 1.2rem; margin-top: .6rem; }
.site-header nav a { font-size: .94rem; }
.site-header [aria-current] { font-weight: 750; color: var(--ink); }
main { max-width: 59rem; margin: auto; padding: 2rem 1.5rem 4rem; }
.breadcrumbs { display: flex; flex-wrap: wrap; gap: .65rem; color: var(--muted); font-size: .88rem; margin-bottom: 1.7rem; }
h1, h2, h3, h4 { line-height: 1.25; letter-spacing: -.02em; }
h1 { font-size: clamp(1.9rem, 5vw, 2.65rem); margin: .2rem 0 1.5rem; }
h2 { font-size: 1.55rem; margin: 2.8rem 0 1rem; }
h3 { font-size: 1.2rem; margin: 2rem 0 .75rem; }
p, ul, ol { margin: 1rem 0; }
li + li { margin-top: .4rem; }
img { max-width: 100%; height: auto; }
.course-content > p > img { display: block; margin: 1.7rem auto .5rem; }
pre, code { font-family: ui-monospace, "Cascadia Code", "DejaVu Sans Mono", monospace; font-size: .88em; }
code { background: var(--wash); padding: .13em .3em; border-radius: .25rem; overflow-wrap: anywhere; }
pre { overflow-x: auto; padding: 1.2rem; border: 1px solid var(--line); border-radius: .45rem; background: var(--wash); line-height: 1.6; }
pre code { padding: 0; font-size: 1em; overflow-wrap: normal; }
.highlight pre { margin: 1.2rem 0; }
.highlight .c, .highlight .c1, .highlight .cm { color: #526174; }
.highlight .k, .highlight .kd, .highlight .kt, .highlight .kn { color: #773878; }
.highlight .s, .highlight .s1, .highlight .s2 { color: #176445; }
.highlight .m, .highlight .mi, .highlight .mf { color: #1b6188; }
table { display: block; width: 100%; max-width: 100%; overflow-x: auto; border-collapse: collapse; margin: 1.5rem 0; font-size: .94rem; }
th, td { border: 1px solid var(--line); padding: .65rem .85rem; text-align: left; vertical-align: top; }
th { background: var(--wash); }
blockquote { margin: 1.5rem 0; padding: .3rem 1.2rem; border-left: 4px solid var(--link); background: var(--wash); }
.mermaid { text-align: center; background: var(--paper); }
.mermaid svg { max-width: 100%; height: auto; }
.diagram-message { font-size: .9rem; color: var(--muted); }
.site-footer { border-top: 1px solid var(--line); padding: 1rem 1.5rem; color: var(--muted); font-size: .88rem; text-align: center; }
.skip-link { position: absolute; left: .75rem; top: -6rem; background: var(--paper); padding: .6rem; z-index: 10; }
.skip-link:focus { top: .75rem; }
@media (max-width: 38rem) { main { padding: 1.5rem 1rem 3rem; } .header-inner { padding: 1rem; } pre { padding: .8rem; } }
@media print { .site-header, .site-footer, .breadcrumbs, .skip-link { display: none; } main { max-width: none; padding: 0; } pre { white-space: pre-wrap; } a { color: inherit; } }