.newsletter-landing_overlay{box-sizing:border-box;position:fixed;inset:0;z-index:1000;display:flex;align-items:center;justify-content:center;padding:1.5rem;background:rgba(0,0,0,.5)}.newsletter-landing_overlay *,.newsletter-landing_overlay :after,.newsletter-landing_overlay :before{box-sizing:border-box}.newsletter-landing_dialog{background:#fff;color:#000;border:1px solid #000;max-width:24rem;width:100%;padding:1.75rem;box-shadow:0 10px 40px rgba(0,0,0,.25)}.newsletter-landing_title{margin:0 0 .75rem;font-size:1.125rem;font-weight:600}.newsletter-landing_message{margin:0 0 1.5rem;font-weight:300;line-height:1.5;color:#1f2937}.newsletter-landing_button{font:inherit;font-weight:500;padding:.6rem 1.4rem;background:#000;color:#fff;border:1px solid #000;cursor:pointer}.newsletter-landing_button:hover{background:#fff;color:#000}@font-face{font-family:Google Sans Wordmark;src:url(/assets/generated/google-sans-wordmark.otf) format("opentype");font-weight:500;font-style:normal;font-display:swap}:root{color-scheme:light;scroll-behavior:smooth;scroll-padding-top:var(--header-height,120px);--font-wordmark:"Google Sans Wordmark",var(--font-mulish),system-ui,sans-serif}body{font-family:var(--font-mulish);font-weight:300;font-size:1.125rem;line-height:1.9;background:#fff;color:#000;-webkit-font-smoothing:antialiased;min-height:100vh;margin:0;transform:translateZ(0)}.inline-math{display:inline}.katex-display{margin:0}.ref-error{font-size:.85em;color:red;font-style:italic}.ref-link{color:#06c;text-decoration:none}.ref-link:hover{text-decoration:underline}.ref-concept{color:inherit;-webkit-text-decoration-line:underline;text-decoration-line:underline;-webkit-text-decoration-style:dotted;text-decoration-style:dotted;-webkit-text-decoration-color:rgba(120,120,120,.38);text-decoration-color:rgba(120,120,120,.38);text-decoration-thickness:2px;text-underline-offset:.2em;cursor:pointer;transition:-webkit-text-decoration-color .16s ease;transition:text-decoration-color .16s ease;transition:text-decoration-color .16s ease,-webkit-text-decoration-color .16s ease}.ref-concept:focus-visible,.ref-concept:hover{-webkit-text-decoration-color:rgba(120,120,120,.72);text-decoration-color:rgba(120,120,120,.72);background:#f5f5f5}.page-content{flex:1 1;width:100%;max-width:64rem;margin:0 auto}@media(min-width:40rem){.page-content{text-align:justify;margin-top:-200px;position:relative;background:#fff;max-width:90%}}@media(min-width:86.25rem){.page-content{max-width:75rem}}.book-shell{display:flex;flex-direction:column;min-height:100vh}.book-shell>main{flex:1 1}@media(min-width:40rem){.hero-placeholder{height:200px}}.stub-main{display:flex;flex-direction:column;justify-content:center;align-items:center}