500;600;700&family=Libre+Caslon+Text:ital,wght@0,400;0,700;1,400&display=swap');
@import url('interactions.css');
:root{--ink:#08090b;--muted:#6b7079;--line:#e1e4ea;--paper:#ffffff;--soft:#f3f5f9;--accent:#1857ed;--ui:'DM Sans',Arial,sans-serif;--body:'Libre Caslon Text',Georgia,serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:110px}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.6 var(--ui)}button,input,textarea{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer;color:inherit}a{color:inherit}button{border:0;background:none}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:5px}button:disabled{cursor:default;opacity:.55}.skip{position:fixed;top:-100px;background:var(--ink);color:white;padding:10px;z-index:30}.skip:focus{top:10px}.progress-track{position:fixed;top:0;left:0;right:0;height:3px;background:var(--line);z-index:31}#progress{width:0;height:100%;background:var(--accent)}.topbar{position:fixed;top:3px;left:0;right:0;height:85px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 40px;background:rgba(255,255,255,.98);z-index:20}.wordmark{text-decoration:none;font-size:16px;font-weight:700;letter-spacing:-.3px;line-height:1.2}.wordmark span{display:block;font-size:10px;letter-spacing:1.4px;margin-top:6px;color:var(--muted)}.top-actions{display:flex;align-items:center;gap:28px}.version,.eyebrow,.toc-heading{font-size:12px;letter-spacing:1.5px;font-weight:600}.version{border:1px solid var(--line);padding:5px 9px;border-radius:3px}.small-button{font-size:14px;border-left:1px solid var(--line);padding-left:25px}.small-button span{display:inline-grid;place-items:center;border-radius:50%;background:var(--soft);width:24px;height:24px;margin-left:6px}#contents-toggle,#contents-close{display:none}.contents{position:fixed;top:128px;left:40px;width:225px;bottom:25px;display:flex;flex-direction:column}.toc-heading{padding-bottom:24px;color:var(--muted);display:flex;justify-content:space-between}.contents nav{overflow:auto;scrollbar-width:thin;flex:1;padding-right:8px}.toc-group{margin:23px 0 9px;font-size:11px;letter-spacing:1.1px;color:var(--muted);text-transform:uppercase}.toc-link{display:flex;gap:11px;text-decoration:none;font-size:13px;line-height:1.45;padding:8px 9px;margin-left:-9px;border-radius:3px;color:#626976;transition:background .2s,color .2s}.toc-link span{font-size:11px;width:17px;flex-shrink:0;padding-top:2px;color:#7b8493}.toc-link.active{background:#edf3ff;color:var(--accent);font-weight:600}.toc-link:hover{color:var(--ink);background:var(--soft)}.toc-bottom{padding-top:20px;font-size:12px;color:var(--muted);display:flex;justify-content:space-between;border-top:1px solid var(--line);margin-top:16px}.toc-bottom button{font-size:12px;color:var(--accent)}main{max-width:714px;margin-left:calc(50% - 325px);padding:150px 20px 0}.opening{border-bottom:1px solid var(--ink);padding-bottom:34px;margin-bottom:84px}.opening .eyebrow{color:var(--accent);margin-bottom:25px}h1{font:700 clamp(64px,6.5vw,98px)/.94 var(--ui);letter-spacing:-6px;margin:0 0 30px}.title-period{color:var(--accent)}.promise{font:400 27px/1.4 var(--body);letter-spacing:-.5px;margin:0 0 10px}.promise-note{font-size:12px;color:var(--muted);margin:0}.byline{display:flex;align-items:center;gap:12px;margin:30px 0;font-size:15px}.author-token{height:42px;width:42px;display:grid;place-items:center;border:1px solid var(--ink);border-radius:50%;font-size:14px;font-weight:600}.byline i{font-family:var(--body);font-style:italic;margin:0 4px;color:var(--muted)}.byline small{display:block;font-size:12px;color:var(--muted);margin-top:2px}.opening-tools{display:flex;gap:24px;align-items:center;border-top:1px solid var(--line);padding-top:20px;font-size:12px;color:var(--muted)}.text-link{text-decoration:none;border-bottom:1px solid currentColor;padding:0 0 3px;font-size:14px;white-space:nowrap;display:inline-flex;align-items:center;gap:12px;color:var(--ink)}#total-time{margin-right:auto}.micro{font-size:12px!important;font-family:var(--ui)!important;line-height:1.6!important;color:var(--muted)}#audio-status:empty{display:none}.reading-rail{position:fixed;top:240px;right:max(30px,calc((100vw - 1390px)/2));width:196px}.rail-rule{height:2px;width:30px;background:var(--ink);margin-bottom:22px}.reading-rail .eyebrow{font-size:10px;line-height:1.6;letter-spacing:1.1px}.reading-rail h2{font:400 24px/1.35 var(--body);letter-spacing:-.5px;margin:14px 0}.reading-rail p{font-size:13px;line-height:1.75;color:var(--muted)}.rail-button{border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:12px 0;text-align:left;font-size:13px;width:100%;display:flex;justify-content:space-between;gap:10px}.rail-current{margin-top:70px}.rail-current span{font-size:10px;letter-spacing:1.2px;color:var(--muted)}.rail-current p{font-size:12px;color:var(--ink)}.chapter{margin-bottom:100px;scroll-margin-top:120px}.chapter-head{margin-bottom:34px}.chapter-kicker{display:flex;align-items:center;justify-content:space-between;font-size:11px;letter-spacing:1.6px;color:var(--muted);text-transform:uppercase}.chapter h2{font:500 42px/1.16 var(--ui);letter-spacing:-1.5px;margin:16px 0 17px}.chapter-author{font-size:13px;color:var(--muted);display:flex;align-items:center;gap:9px}.voice-mark{font-size:10px;border:1px solid var(--line);padding:2px 5px;letter-spacing:1px}.prose{font:400 19px/1.88 var(--body);letter-spacing:-.13px}.prose p{margin:0 0 1.25em;white-space:normal;overflow-wrap:break-word}.prose h3{font:600 25px/1.35 var(--ui);letter-spacing:-.5px;margin:45px 0 20px}.prose strong{font-weight:700}.prose ul{padding-left:25px;margin:0 0 24px}.prose li{margin:8px 0}.prose .caption{font:italic 13px/1.6 var(--body);color:var(--muted);margin-top:-10px}.prose .editor-note{font:12px/1.6 var(--ui);border-left:2px solid #a5adbc;padding-left:12px;color:var(--muted)}.figure{margin:34px -15px 25px;position:relative}.figure button{display:block;padding:0;width:100%;border:1px solid var(--line);background:white;border-radius:3px;overflow:hidden}.figure img{max-width:100%;width:auto;height:auto;max-height:730px;display:block;margin:auto}.figure figcaption{font:11px/1.5 var(--ui);color:var(--muted);padding-top:8px;text-align:right}.part-heading{margin:110px 0 70px;border-top:1px solid var(--ink);padding-top:24px}.part-heading .eyebrow{color:var(--accent)}.part-heading h2{font:500 54px/1.05 var(--ui);letter-spacing:-2px;margin:20px 0}.part-heading p{font:18px/1.7 var(--body);max-width:600px}.stage-heading{border-top:1px solid var(--line);padding-top:25px;margin:60px 0 45px;font:500 18px/1.5 var(--ui)}.experience{font:16px/1.6 var(--ui);margin:44px 0;padding:30px;background:var(--soft);border:1px solid #dbe5ff}.experience .eyebrow{font-size:10px;color:var(--accent)}.experience h3{font:500 29px/1.2 var(--ui);letter-spacing:-.6px;margin:12px 0}.experience p{font:15px/1.75 var(--ui);color:#596475;margin:12px 0 20px}.primary{background:var(--ink);color:white;padding:12px 19px;font-size:14px;display:inline-flex;gap:22px;justify-content:space-between;align-items:center;border-radius:2px}.primary:hover{background:var(--accent)}.experience .micro{margin:12px 0 0}.chapter-end{display:flex;justify-content:space-between;align-items:center;border-top:1px solid var(--line);padding-top:18px;margin-top:35px;font-size:12px;color:var(--muted)}.chapter-end button{font-size:13px}.book-footer{border-top:1px solid var(--ink);padding:42px 0 90px;display:flex;flex-wrap:wrap;gap:24px;justify-content:space-between}.footer-title{width:100%;font:500 44px/1.15 var(--ui);letter-spacing:-1.4px}.book-footer p{font-size:12px;color:var(--muted);width:100%}.book-footer .text-link{font-size:12px}.loading{min-height:200px}dialog{border:none;padding:32px;width:min(580px,100vw);max-height:100dvh;height:100dvh;position:fixed;inset:0 0 0 auto;margin:0;background:var(--paper);color:var(--ink);overflow-y:auto;box-shadow:-12px 0 60px #0002}dialog::backdrop{background:#070e2066;backdrop-filter:blur(3px)}.dialog-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px}.dialog-top button,#image-close{font-size:30px;line-height:1}.dialog-top .eyebrow{font-size:11px;color:var(--accent)}dialog h2{font:500 38px/1.1 var(--ui);letter-spacing:-1px;margin:0 0 20px}dialog p{font-size:15px;color:var(--muted);line-height:1.7}.field{display:block;margin:24px 0;font-size:14px;font-weight:500}.field small{display:block;color:var(--muted);font-size:12px;font-weight:400;margin-top:4px}.field textarea{display:block;width:100%;padding:13px;background:white;border:1px solid #bfc9db;min-height:95px;resize:vertical;font-size:15px;line-height:1.5;margin-top:9px;border-radius:2px}.field input{width:100%;border:1px solid #bfc9db;background:white;padding:11px}.save-state{font-size:12px;color:var(--accent)}.notes-list{margin:20px 0}.note-item{border-top:1px solid var(--line);padding:22px 0}.note-item h3{font-size:17px;margin:0 0 10px}.note-item p{white-space:pre-wrap;color:var(--ink)}.result-box{padding:24px;border:1px solid var(--line);margin:25px 0}.result-box p{white-space:pre-wrap;color:var(--ink)}.dialog-actions{display:flex;flex-wrap:wrap;gap:16px;margin-top:20px}.disclosure{padding:15px;border:1px solid var(--line);font-size:13px!important}.preview-tag{display:inline-block;font-size:10px;letter-spacing:1.2px;border:1px solid var(--line);padding:3px 6px;margin-bottom:20px}.equation-interactive{margin:40px 0;font-family:var(--ui);border:1px solid var(--line);padding:26px}.equation-interactive .equation-row{display:flex;gap:8px;align-items:center}.equation-row button{flex:1;padding:16px 8px;background:var(--soft);border:1px solid transparent;font-size:14px;font-weight:600;line-height:1.4}.equation-row button[aria-pressed=true]{border-color:var(--accent);color:var(--accent);background:#edf3ff}.equation-explain{font:16px/1.7 var(--ui);min-height:95px;padding-top:20px}.equation-goal{border-top:1px solid var(--line);padding-top:15px;font-size:14px}.equation-goal small{display:block;font-size:12px;color:var(--muted)}#image-view{inset:4vh 3vw;margin:auto;width:94vw;height:auto;max-height:92vh;padding:20px;text-align:center;box-shadow:none;background:white}#image-view img{max-width:100%;max-height:80vh;object-fit:contain}#image-close{position:sticky;top:0;display:block;margin-left:auto;background:white;border:1px solid var(--line);border-radius:50%;width:38px;height:38px}#image-view p{font-size:12px}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%) translateY(120px);background:var(--ink);color:white;padding:12px 20px;z-index:50;font-size:13px;transition:transform .2s}#toast.show{transform:translateX(-50%) translateY(0)}
@media(min-width:1600px){main{margin-left:calc(50% - 355px)}.contents{left:calc((100vw - 1520px)/2)}.reading-rail{right:calc((100vw - 1450px)/2)}}@media(max-width:1270px){.reading-rail{display:none}main{margin-left:310px;max-width:740px}.contents{width:220px;left:30px}.topbar{padding:0 30px}}@media(max-width:900px){.topbar{height:73px;padding:0 23px}.contents{display:none;top:76px;left:0;bottom:0;width:310px;background:var(--paper);padding:30px 24px;z-index:23}.contents.open{display:flex}#contents-toggle,#contents-close{display:block}#contents-toggle{font-size:13px}.toc-link{font-size:14px}.toc-group{font-size:12px}.toc-heading{padding-bottom:10px}#page-shade:not([hidden]){position:fixed;inset:76px 0 0;background:#0005;z-index:22}.version{display:none}main{margin:auto;padding-top:126px;max-width:700px}.small-button{padding-left:0;border:0}.top-actions{gap:16px}.wordmark{font-size:13px}.wordmark span{font-size:8px}h1{font-size:84px}.opening{margin-bottom:65px}}@media(max-width:560px){.topbar{padding:0 18px}.wordmark{max-width:155px;font-size:12px}.wordmark span{font-size:7px;letter-spacing:1px}.top-actions{gap:10px}.small-button{font-size:0}.small-button:before{content:'Notes';font-size:13px}.small-button span{font-size:11px;width:18px;height:18px;margin-left:4px}main{padding:115px 24px 0}.opening .eyebrow{font-size:10px;letter-spacing:1.2px}h1{font-size:64px;letter-spacing:-4px}.promise{font-size:23px}.promise-note{font-size:11px}.opening-tools{flex-wrap:wrap;gap:15px}.opening-tools .text-link{font-size:12px}.opening-tools #listen{width:100%;border-bottom:0;justify-content:flex-start}#total-time{margin-left:auto;margin-right:0}.prose{font-size:18px;line-height:1.85}.chapter h2{font-size:34px;letter-spacing:-1px}.chapter-kicker{font-size:10px;letter-spacing:1px}.prose h3{font-size:23px}.chapter{margin-bottom:75px}.part-heading{margin:75px 0 50px}.part-heading h2{font-size:42px}.part-heading p{font-size:17px}.figure{margin-left:-10px;margin-right:-10px}.experience{padding:24px}.experience h3{font-size:26px}.experience .primary{width:100%}.chapter-end{align-items:flex-start;gap:12px}.chapter-end span{max-width:145px}.equation-interactive{padding:18px}.equation-row button{font-size:12px;padding:13px 5px}.equation-explain{font-size:15px}.footer-title{font-size:38px}dialog{padding:24px}dialog h2{font-size:32px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}