/* Reading proportions and heading rhythm adapted from Writebook, MIT, 37signals. */
:root{color-scheme:light dark;--ink:#191919;--paper:#fff;--muted:#666;--rule:#ddd;--header:rgba(255,255,255,.97);--hover:#1559a6;--focus:#1559a6;--progress-track:#eee;--button-ink:#fff;--button-hover:#333;--accent:#c63e32;--tip-bg:#f6f1e7;--reading-size:21px}
*{box-sizing:border-box}html{scroll-padding-top:5rem}body{margin:0;color:var(--ink);background:var(--paper);font-family:Georgia,'Times New Roman',serif}a{color:inherit;text-underline-offset:.18em}a:hover{color:var(--hover)}a:focus-visible,button:focus-visible,summary:focus-visible{outline:3px solid var(--focus);outline-offset:4px}button,summary,.reader-header,.page-navigation,.contents,.book-meta,.home-actions,.site-footer{font-family:system-ui,sans-serif}button{background:var(--paper);border:1px solid var(--rule);border-radius:4px;padding:.5rem .8rem;color:var(--ink);font-size:inherit;cursor:pointer}.reader-header{position:sticky;top:0;background:var(--header);border-bottom:1px solid var(--rule);z-index:5}.header-inner{max-width:1100px;margin:auto;padding:.85rem 1.4rem;display:flex;align-items:center;justify-content:space-between;gap:1rem}.book-link{font-weight:650;text-decoration:none}.header-controls{display:flex;align-items:center;gap:.7rem}.contents-toggle{position:relative}.contents-toggle>summary{cursor:pointer;list-style:none}.contents-toggle>summary::-webkit-details-marker{display:none}.contents-panel{position:absolute;right:0;top:2.5rem;width:min(26rem,calc(100vw - 2rem));max-height:75vh;overflow:auto;padding:1.4rem;background:var(--paper);border:1px solid var(--rule);box-shadow:0 8px 24px #0001}.contents-panel h2{font-size:1.1rem;margin:0 0 1rem}.contents{list-style:none;margin:0;padding:0;line-height:1.5}.contents li{margin:.45rem 0}.contents a{text-decoration:none}.contents a:hover{text-decoration:underline}.contents .part{font-weight:750;margin-top:1.5rem}.contents [aria-current=page]{text-decoration:underline;font-weight:650}.progress{height:2px;background:var(--progress-track)}.progress-bar{display:block;height:100%;width:0;background:var(--ink)}.reading{max-width:67ch;padding:3rem 1.5rem 4rem;margin:auto;font-size:var(--reading-size);line-height:1.65;overflow-wrap:break-word}.reading h1,.reading h2,.reading h3{font-family:system-ui,sans-serif;line-height:1.15;letter-spacing:-.025em;text-wrap:balance}.reading h1{font-size:2.25em;margin:0 0 1.1em;font-weight:800}.reading h2{font-size:1.45em;margin:2em 0 .65em}.reading h3{font-size:1.15em;margin:1.6em 0 .65em}.reading p,.reading ul,.reading ol{margin:0 0 1.1em}.reading img{display:block;max-width:100%;height:auto;margin:1.8em auto;width:auto}.reading blockquote{font-style:italic;margin:1.5em 2ch}.pullquote{font-family:Georgia,'Times New Roman',serif;font-weight:600;font-size:clamp(1.35rem,2.4vw,1.8rem);line-height:1.3;letter-spacing:-.012em;color:var(--ink);max-width:26em;margin:2.6em auto;padding:.75em 0 .65em;border-top:2px solid var(--accent);border-bottom:2px solid var(--accent);break-inside:avoid;text-align:left;font-feature-settings:"kern" 1,"liga" 1}.pullquote::before{content:"\201C";display:block;font-family:Georgia,'Times New Roman',serif;font-size:3.2rem;line-height:.65;color:var(--accent);margin:.15em 0 .1em}.reading .pullquote p{margin:.5em 0;hyphens:none;-webkit-hyphens:none}.tip{margin:2.2em 0;padding:1.1em 1.4em;background:var(--tip-bg);border-left:3px solid var(--accent);line-height:1.5;break-inside:avoid}.reading .tip p{margin:.3em 0}.reading table{border-collapse:collapse;display:block;overflow:auto;max-width:100%;font-size:.85em}.reading th,.reading td{padding:.6em;border:1px solid var(--rule)}.reading pre{overflow:auto;font-size:.8em}.reading [id]{scroll-margin-top:6rem}.page-navigation{display:flex;justify-content:space-between;gap:2rem;border-top:1px solid var(--rule);padding-top:1.5rem;margin-top:3rem;font-size:1rem;line-height:1.5}.page-navigation a{max-width:48%;text-decoration:none}.page-navigation span{display:block;color:var(--muted);font-size:.85rem}.page-navigation .next{text-align:right;margin-left:auto}.home{max-width:1300px;margin:auto;padding:4rem 1.5rem}.book-intro{display:grid;grid-template-columns:minmax(180px,300px) 1fr;align-items:center;gap:4rem;margin-bottom:4rem}.book-cover{width:100%;height:auto;box-shadow:0 8px 30px #0002}.book-title{font:800 clamp(2.6rem,5vw,4.7rem)/1.03 system-ui,sans-serif;letter-spacing:-.05em;margin:0 0 1.2rem}.book-subtitle{font-size:1.5rem;line-height:1.35;margin:0 0 1.4rem}.book-meta{font-size:1rem;color:var(--muted)}.home-actions{display:flex;align-items:center;gap:1rem;flex-wrap:wrap;margin-top:2rem}.start-reading{display:inline-block;background:var(--ink);color:var(--button-ink);padding:.8rem 1.1rem;border-radius:4px;text-decoration:none}.start-reading:hover{background:var(--button-hover);color:var(--button-ink)}.resume-reading[hidden]{display:none}.home-contents{max-width:700px;margin:auto}.home-contents>h2{font:750 2rem system-ui,sans-serif;letter-spacing:-.025em}.home-contents .contents{font-size:1.08rem;columns:2;column-gap:3rem}.home-contents li{break-inside:avoid}.site-footer{font-size:.85rem;color:var(--muted);max-width:1100px;margin:auto;padding:2rem 1.5rem;border-top:1px solid var(--rule);display:flex;gap:1rem;flex-wrap:wrap}.skip-link{position:absolute;top:-100px;left:1rem;z-index:20;background:var(--paper);padding:.6rem}.skip-link:focus{top:1rem}.reading .part-page{padding-block:3rem}.chapter-context{font:500 .85rem system-ui,sans-serif;color:var(--muted);margin-bottom:1.5rem}
@media(max-width:700px){:root{--reading-size:19px}.header-inner{padding:.8rem 1rem}.book-link{font-size:.9rem;max-width:48%}.header-controls{gap:.55rem}.reading{padding:2rem 1.1rem 3rem}.reading h1{font-size:1.9em}.home{padding:2rem 1.25rem}.book-intro{grid-template-columns:1fr;gap:2rem;text-align:center}.book-cover{max-width:230px;margin:auto}.home-actions{justify-content:center}.book-title{font-size:3rem}.home-contents .contents{columns:1}}
@media print{.reader-header,.page-navigation,.site-footer,.skip-link{display:none}.reading{font-size:12pt;max-width:none;padding:0}.reading img{max-height:70vh}.reading h1,.reading h2{break-after:avoid}}
.book-intro{grid-template-columns:minmax(350px,1.35fr) 1fr;gap:2rem}.book-object{position:relative;width:100%;height:620px;display:flex;align-items:center;justify-content:center;cursor:grab;touch-action:none;outline-offset:4px}.book-object:focus{outline:none}.book-object .book-cover{width:260px;max-width:70%;height:auto}.book-object canvas{position:absolute;inset:0;width:100%;height:100%;opacity:0}.book-rendered canvas{opacity:1}.book-rendered .book-cover{visibility:hidden}.book-dragging{cursor:grabbing}.book-title del,.book-link del{text-decoration-thickness:.07em;text-decoration-color:#ab322b}.reading a em{text-decoration:inherit}
@media(max-width:700px){.book-intro{grid-template-columns:1fr;gap:.6rem}.book-object{height:clamp(440px,80vw,560px);width:calc(100% + 2.5rem);max-width:600px;margin-inline:0;justify-self:center}.book-object .book-cover{max-width:200px}}


.reading p,.reading li{hyphens:auto;-webkit-hyphens:auto;hyphenate-limit-chars:6 3 3;hyphenate-limit-lines:2;-webkit-hyphenate-limit-before:3;-webkit-hyphenate-limit-after:3}.reading :is(h1,h2,h3,h4,h5,h6,pre,code),.reader-header,.contents,.page-navigation{hyphens:none;-webkit-hyphens:none}
@media(prefers-color-scheme:dark){:root{--ink:#e9e6e0;--paper:#1b1c1e;--muted:#b8b6b2;--rule:#45464a;--header:rgba(27,28,30,.97);--hover:#9bc6ff;--focus:#9bc6ff;--progress-track:#393a3e;--button-ink:#1b1c1e;--button-hover:#d8d5d0;--accent:#ee7970;--tip-bg:#282624}.contents-panel{box-shadow:0 8px 24px #0005}.book-title del,.book-link del{text-decoration-color:#ee7970}}
@media print{:root{color-scheme:light;--ink:#191919;--paper:#fff;--muted:#666;--rule:#ddd}}

.part-chapters{list-style:none;padding:0;margin:2rem 0}.part-chapters li{margin:0;border-top:1px solid var(--rule)}.part-chapters li:last-child{border-bottom:1px solid var(--rule)}.part-chapters a{display:block;padding:1.1rem 0;text-decoration:none;font:650 1.1em/1.35 system-ui,sans-serif}.part-chapters span{display:block;font:400 .8rem/1.5 system-ui,sans-serif;color:var(--muted);margin-bottom:.3rem}
.js .book-object:not(.book-ready) .book-cover{visibility:hidden}.book-object canvas{transition:opacity .25s ease-out}@media(prefers-reduced-motion:reduce){.book-object canvas{transition:none}}
.book-object::before{content:"";position:absolute;inset:2%;background-image:url("/canvas-grain.png");opacity:.025;mask-image:radial-gradient(ellipse,#000 45%,transparent 72%);pointer-events:none}
.reading figure:has(img[src*="author_portrait"]){width:33.333%;float:right;margin:.2em 0 1.5em 2em}.reading img[src*="author_portrait"]{width:100%;margin:0}.reading figure:has(img[src*="author_portrait"]) figcaption{font:400 .8rem/1.5 system-ui,sans-serif;text-align:center;color:var(--muted);margin-top:.5em}.reading .page-navigation{clear:both}@media(max-width:700px){.reading figure:has(img[src*="author_portrait"]){float:none;width:min(75%,280px);margin:1.5em auto}}
.image-filters{position:absolute;pointer-events:none}
.landing-theme{position:fixed;top:1rem;right:1.25rem;z-index:15;display:flex;align-items:center;gap:.4rem;padding:.25rem;border-radius:6px;background:var(--header)}

.prototype-bonus{max-width:700px;margin:0 auto 4rem;padding:2rem 0;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule);font-size:1.15rem;line-height:1.55}.prototype-bonus h2{font:750 1.6rem/1.2 system-ui,sans-serif;margin:0 0 1rem;letter-spacing:-.02em}.prototype-bonus p{margin:0 0 1rem}.prototype-bonus a{font:600 1rem system-ui,sans-serif}.prototype-stages{display:grid;grid-template-columns:1fr 1fr;gap:1rem 2rem;padding-left:1.25em}.reading .prototype-stages h2{font-size:1.2em;margin:.4em 0}.prototype-stages li::marker{font-family:system-ui,sans-serif;font-weight:650}.prototype-stages p{font-size:.9em}.prompt-label{display:block;font:600 .9rem system-ui,sans-serif;margin-bottom:.5rem}.prototype-prompt{width:100%;resize:vertical;background:var(--paper);color:var(--ink);border:1px solid var(--rule);border-radius:4px;padding:1rem;font:400 1rem/1.55 ui-monospace,SFMono-Regular,Consolas,monospace}.prototype-prompt:focus-visible{outline:3px solid var(--focus);outline-offset:3px}.prototype-copy{display:flex;align-items:center;gap:1rem;margin:1rem 0 1.5rem;font:400 .9rem/1.4 system-ui,sans-serif}.prototype-copy button{flex-shrink:0}.prototype-copy button:disabled{opacity:.65;cursor:wait}
@media(max-width:700px){.prototype-stages{grid-template-columns:1fr}.prototype-bonus{font-size:1.05rem;margin-bottom:2rem}.prototype-copy{align-items:flex-start;flex-direction:column}}

.reader-header{background:#c63e32;color:#fff1d6;border-bottom-color:#a22e25}.reader-header .header-inner{max-width:none;min-height:68px;padding:.7rem clamp(1.25rem,3vw,3rem)}.spine-link{display:block;flex:1;min-width:0;max-width:none;overflow:hidden;text-overflow:ellipsis;font:700 clamp(.95rem,2.3vw,1.9rem)/1.15 Georgia,'Times New Roman',serif;white-space:nowrap}.header-spine{display:block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.reader-header .book-link del{text-decoration-color:#54261e}.reader-header .header-controls{flex-shrink:0}.reader-header .theme-toggle,.reader-header .theme-auto{background:transparent;color:inherit;border-color:transparent}.reader-header .contents-panel{color:var(--ink)}.landing-header{position:fixed;inset:0 0 auto;visibility:hidden;opacity:0;transition:opacity .18s ease}.landing-header.header-revealed{visibility:visible;opacity:var(--header-opacity,0);clip-path:inset(0 calc((1 - var(--header-stretch,0)) * 30vw))}.landing-header .header-inner{opacity:var(--header-content-opacity,0)}.landing-theme.theme-docked{visibility:hidden}.book-object canvas.book-morphing{position:fixed;inset:auto;z-index:6;pointer-events:none;transition:none}.book-object.book-docked{cursor:default}.book-object.book-docked::before{opacity:0}
@media(max-width:700px){.reader-header .header-inner{min-height:56px;padding:.7rem 1rem}.reader-header .header-controls{gap:.3rem}.reader-header .contents-toggle{font-size:.8rem}.reader-header .theme-toggle{padding:.3rem}.spine-link{font-size:clamp(.85rem,3.8vw,1.1rem)}}
@media(prefers-reduced-motion:reduce){.landing-header{transition:none}}

.reader-header .header-read-now,.reader-header .header-prototyper{display:inline-flex;align-items:center;justify-content:center;min-height:40px;padding:.5rem .7rem;white-space:nowrap;font-size:.85rem;font-weight:600}.reader-header .header-read-now{background:#fff1d6;color:#8a231b;border-radius:4px;text-decoration:none}.reader-header .header-prototyper{text-underline-offset:.2em}@media(max-width:700px){.reader-header .header-inner{gap:.4rem}.reader-header .header-controls{gap:.2rem}.reader-header .header-read-now,.reader-header .header-prototyper{font-size:.7rem;padding:.5rem .4rem}.reader-header .theme-auto{font-size:.65rem;padding:.3rem}.reader-header .spine-link{font-size:.85rem}}
.prototype-examples{margin:3.5rem 0}.prototype-examples>p{margin:0 0 1rem}.example-subtitle{margin-top:2.75rem}
.example-grid{list-style:none;padding:0;margin:1.5rem 0 0;display:grid;grid-template-columns:1fr 1fr;gap:1.25rem}
.example-card{display:flex;flex-direction:column;height:100%;text-decoration:none;color:inherit;border:1px solid var(--rule);border-radius:10px;overflow:hidden;background:var(--paper);transition:border-color .15s ease,transform .15s ease}
.example-card:hover{border-color:var(--hover)}.example-card:focus-visible{outline:3px solid var(--focus);outline-offset:3px}
.reading .example-card img{display:block;width:100%;aspect-ratio:16/10;object-fit:cover;object-position:top left;margin:0;border-bottom:1px solid var(--rule);filter:none!important}
.example-card-kicker{font:600 .72rem/1.35 system-ui,sans-serif;letter-spacing:.04em;text-transform:uppercase;color:var(--muted);padding:.9rem 1rem 0}
.example-card-title{font:750 1.15rem/1.2 system-ui,sans-serif;letter-spacing:-.01em;padding:.3rem 1rem 0}
.example-card-text{font:400 .92rem/1.45 system-ui,sans-serif;color:var(--muted);padding:.4rem 1rem 1.1rem}
.example-page .example-crumbs{font:400 .9rem/1.4 system-ui,sans-serif;color:var(--muted);margin:0 0 1.75rem}
.example-kicker{font:600 .8rem/1.35 system-ui,sans-serif;letter-spacing:.05em;text-transform:uppercase;color:var(--accent);margin:0 0 .5rem}
.example-page h1{margin-bottom:.4em}.example-lede{font-size:1.15em;line-height:1.5}
.example-page figure{margin:2rem 0}.reading.example-page figure img{margin:0;border:1px solid var(--rule);border-radius:8px;filter:none!important}
.example-page figcaption{font:400 .85rem/1.45 system-ui,sans-serif;color:var(--muted);margin-top:.6rem}
.example-facts{display:grid;grid-template-columns:1fr 1fr;gap:1rem 2rem;font:400 .95rem/1.5 system-ui,sans-serif;margin:2rem 0;padding:1.25rem 0;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.example-facts dt{font-weight:650;margin-bottom:.2rem}.example-facts dd{margin:0}
.example-table{overflow-x:auto;margin:1.25rem 0 0}.reading.example-page table{border-collapse:collapse;width:100%;border-top:1px solid var(--rule);font:400 .95rem/1.5 system-ui,sans-serif}
.reading.example-page th,.reading.example-page td{border:0;border-bottom:1px solid var(--rule);padding:.85rem 0;text-align:left;vertical-align:top}.reading.example-page th{width:34%;padding-right:1.5rem;font-weight:600}@media (max-width:560px){.reading.example-page th,.reading.example-page td{display:block;width:auto;padding-right:0}.reading.example-page th{border-bottom:0;padding-bottom:.2rem}.reading.example-page td{padding-top:0}}
.example-phones{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;margin:2rem 0}.example-page .example-phones figure{margin:0}
@media (max-width:700px){.example-grid{grid-template-columns:1fr}.example-facts{grid-template-columns:1fr}.example-phones{grid-template-columns:1fr 1fr}}
@media (prefers-reduced-motion:no-preference){.example-card:hover{transform:translateY(-2px)}}
.reading.example-page .example-wide{width:min(1040px,calc(100vw - 36px));margin-left:50%;transform:translateX(-50%)}