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@media(min-width:1440px){.hero h1{font-size:60px}.hero-art{min-height:570px}.book-object{width:242px}}
@media(max-width:1100px){.section-wrap{padding-left:35px;padding-right:35px}.header{padding:0 35px}.header nav{gap:18px}.hero{gap:25px}.hero h1{font-size:43px}.hero-art{min-height:520px}.book-object{width:204px}.hero .button-row{gap:12px}.hero .button{padding:12px 15px;font-size:11px}.hero .text-link{font-size:10px}.fact-strip{padding:30px 35px;gap:30px}.hero-bookname span{display:block;margin:4px 0 0}.round-seal{width:78px;height:78px;right:12px}.round-seal strong{font-size:34px}.round-seal span{font-size:8px}.intro-grid{gap:40px}.writing-studio{gap:35px}.chapter-detail{padding:30px}.author{gap:40px}.author-mark{font-size:150px}.quote-card blockquote{font-size:19px}}
@media(max-width:780px){html{scroll-padding-top:20px}.section-wrap{padding-left:24px;padding-right:24px}.section-space{padding-top:70px;padding-bottom:70px}.header{height:77px;padding:0 24px}.header nav{display:none}.hero{grid-template-columns:1fr;gap:32px;padding-top:30px;padding-bottom:35px}.hero-copy{padding-top:3px}.hero h1{font-size:clamp(38px,7.3vw,55px);margin-bottom:20px}.hero .eyebrow{margin-bottom:24px}.hero-desc{margin-bottom:22px}.hero-bookname span{display:inline;margin-left:7px}.hero-foot{padding-top:25px;margin-top:0}.hero .button{font-size:12px;padding:14px 21px}.hero .text-link{font-size:11px}.hero-art{min-height:510px}.book-object{width:233px}.art-equation.one{right:35px}.art-equation.two{left:35px}.round-seal{right:43px;bottom:100px;width:86px;height:86px}.fact-strip{padding:27px 24px;gap:13px;flex-wrap:wrap}.fact-strip strong{font-size:26px}.fact-strip strong span{font-size:12px}.fact-strip strong:not(:has(span)){font-size:23px}.fact-strip p{font-size:9px}.fact-strip>a{display:none}.fact-plus{font-size:22px}.section-label{margin-bottom:30px;padding-bottom:20px;font-size:10px}.intro-grid{grid-template-columns:1fr;gap:13px}.intro-grid h2{margin-bottom:20px}.intro-grid .lead{font-size:20px}.intro-grid p{font-size:13px}.flow{flex-wrap:wrap;justify-content:flex-start;gap:12px;margin-top:24px}.flow span{font-size:16px}.flow b{font-size:13px}.audience{grid-template-columns:1fr;gap:25px;margin-top:35px}.audience article{padding-left:17px;position:relative}.audience h3{margin:0 0 9px 35px;font-size:15px}.audience article>span{position:absolute;top:-4px}.audience p{padding-left:35px}.section-heading{display:block;margin-bottom:30px}.section-heading>p{font-size:12px;margin-top:23px}.era-tabs{grid-template-columns:repeat(2,1fr);gap:9px;margin-bottom:20px}.era-tabs button{padding:12px 7px;font-size:12px;gap:10px}.era-tabs button span{font-size:21px}.explore-grid{grid-template-columns:1fr;gap:15px}.chapter-list{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.chapter-list button{padding:13px 11px;display:flex;align-items:flex-start;flex-direction:column;gap:5px}.chapter-list button strong{font-size:12px}.chapter-list button small{font-size:10px}.chapter-list button>span:last-child{display:none}.chapter-number{font-size:17px}.chapter-detail{padding:27px 25px}.chapter-detail h3{font-size:25px}.chapter-detail .chapter-story{max-width:none;font-size:12px}.chapter-detail .formula{font-size:26px}.toc-grid{grid-template-columns:repeat(2,1fr)}.reader-controls{align-items:flex-start;flex-direction:column;gap:12px}.chip{font-size:10px;padding:7px 12px}.reviews-grid{grid-template-columns:repeat(2,1fr);gap:14px}.review-card{padding:22px 19px}.review-card h3{font-size:18px;min-height:0}.review-card .review-top{flex-direction:column;gap:4px;align-items:flex-start}.review-card .review-summary{font-size:11px}.review-card footer{flex-direction:column;align-items:flex-start}.quote-gallery{grid-template-columns:1fr;gap:18px}.quote-card{min-height:0;padding:26px}.quote-card blockquote{font-size:22px;margin:18px 0 25px}.writing-studio{grid-template-columns:1fr;gap:35px;margin-top:36px;padding-top:34px}.studio-preview canvas{max-height:580px;width:auto;max-width:100%}.reading-download{align-items:flex-start;flex-direction:column}.preview-grid{gap:12px}.preview-button{padding:12px}.preview-button span{font-size:9px;padding-top:12px}.preview-button span b{display:none}.author{grid-template-columns:1fr;gap:25px;padding-top:38px;padding-bottom:38px}.author-mark{font-size:125px;justify-content:flex-start;gap:30px}.author-mark span{font-size:16px}.author-copy p{font-size:12px}.promo-grid{grid-template-columns:1fr 1fr;gap:20px 15px}.promo-grid a:last-child{display:none}.promo-grid a>span{font-size:10px}.press-bar{align-items:flex-start;flex-direction:column;gap:18px}.share-copy{grid-template-columns:1fr;gap:22px}.share-copy>div:last-child{flex-direction:row;justify-content:flex-start;gap:22px}.buy{padding:55px 0}.buy-grid{grid-template-columns:1fr;gap:0}.buy h2{font-size:32px}.buy p{font-size:13px}.buy p span{display:block;font-size:11px;margin:5px 0}.buy-graphic{display:none}.buy-links{gap:8px}.buy-links .button{padding:12px 16px;font-size:11px}.footer{flex-wrap:wrap;gap:23px;padding-top:30px;padding-bottom:30px}.footer>p{font-size:10px}.footer>div{width:100%;justify-content:space-between}}
@media(max-width:420px){.section-wrap{padding-left:20px;padding-right:20px}.header{padding:0 20px}.hero h1{font-size:38px}.hero-bookname{font-size:15px}.hero-bookname span{font-size:10px}.hero-art{min-height:465px}.book-object{width:206px}.round-seal{right:20px;bottom:92px}.hero .button-row{gap:17px}.hero .button{padding:13px 15px}.hero .text-link{font-size:10px}.fact-strip{padding:25px 20px}.fact-strip strong{font-size:25px}.fact-strip strong:not(:has(span)){font-size:19px}.reviews-grid{grid-template-columns:1fr}.review-card h3{font-size:21px}.review-card .review-top{flex-direction:row}.review-card footer{flex-direction:row}.review-card .review-summary{font-size:12px}.flow{gap:9px}.flow span{font-size:14px}.form-columns{gap:10px}.preview-grid{grid-template-columns:1fr}.preview-button{display:grid;grid-template-columns:110px 1fr;gap:23px;padding:20px;align-items:center}.preview-button span{font-size:13px}.promo-grid a>span{font-size:9px}.book-meta{gap:10px 19px}.book-meta div{font-size:9px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}

/* Book trailer */
.video-section{background:var(--ink);color:var(--paper);padding-top:66px;padding-bottom:64px;border-top:1px solid #435057}
.video-section .section-label{display:flex;justify-content:space-between;gap:20px;border-color:#4a565b;color:#b6c4be}
.video-label-time{font-family:Georgia,serif;font-size:16px;letter-spacing:.02em;color:var(--orange)}
.video-section .section-heading h2{line-height:1.5}
.video-section .section-heading>p{color:#b6c4be}
.video-layout{display:grid;grid-template-columns:minmax(0,2.72fr) minmax(245px,1fr);gap:32px;align-items:start}
.video-main,.video-scenes{min-width:0}
.video-frame{position:relative;aspect-ratio:16 / 9;background:#10191e url('promo-video-poster.jpg') center / cover;border:1px solid #59635c;overflow:hidden}
.video-frame iframe{display:block;position:absolute;inset:0;width:100%;height:100%;border:0}
.video-player-bar{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:47px;padding:12px 0;border-bottom:1px solid #465157;font-size:10px;color:#c7d0c8}
.video-player-bar>div{display:flex;align-items:center;gap:8px;min-width:0}
.video-dot{display:block;flex:0 0 5px;width:5px;height:5px;border-radius:50%;background:#83958c}
.video-is-playing .video-dot{background:var(--orange)}
[id$="-playback-time"]{white-space:nowrap;font-variant-numeric:tabular-nums;letter-spacing:.04em}
.video-meta{display:flex;justify-content:space-between;align-items:baseline;gap:15px;margin-top:14px;font-size:9px;color:#aebbb5}
.video-meta a{white-space:nowrap;border-bottom:1px solid #64756b}
.video-scenes .eyebrow{font-size:10px;letter-spacing:.1em;margin-bottom:7px;color:#aebfb4}
.video-scene-hint{font-size:16px;margin-bottom:19px;letter-spacing:-.025em}
.video-chapters{list-style:none;padding:0;margin:0;border-top:1px solid #53625b}
.video-chapters li{border-bottom:1px solid #46534e}
.video-chapters button{display:grid;grid-template-columns:22px minmax(0,1fr) 34px;gap:10px;width:100%;min-height:52px;align-items:center;text-align:left;padding:12px 0;border:0;background:transparent;color:var(--paper);font-size:12px;line-height:1.55;transition:color .2s,background .2s}
.video-chapter-number{font-family:Georgia,serif;font-size:13px;color:#91a396}
.video-chapters time{font-size:9px;color:#a8b8ae;font-variant-numeric:tabular-nums}
.video-chapters button:hover:not(:disabled),.video-chapters button[aria-current="true"]{color:#ff815b}
.video-chapters button[aria-current="true"] .video-chapter-number{color:#ff815b}
.video-chapters button:disabled{cursor:default;opacity:.7}
.video-actions{display:flex;flex-wrap:wrap;align-items:center;gap:16px;margin-top:19px}
.video-toggle{display:flex;align-items:center;justify-content:space-between;gap:20px;border:1px solid #b2bcb0;background:transparent;color:var(--paper);padding:9px 13px;min-width:117px;font-size:11px}
.video-toggle:disabled{opacity:.55;cursor:default}
.video-toggle:hover:not(:disabled){background:var(--paper);color:var(--ink)}
.video-actions>a{font-size:10px;border-bottom:1px solid #708376;color:#c6d1c7}
.video-transcript{margin-top:35px;border-top:1px solid #536158;border-bottom:1px solid #536158}
.video-transcript summary{display:flex;justify-content:space-between;gap:20px;padding:19px 0;cursor:pointer;list-style:none;font-size:12px;color:#d8e0d4}
.video-transcript summary::-webkit-details-marker{display:none}
.video-transcript summary>span{font-size:16px;line-height:1.3;color:var(--orange);transition:transform .2s}
.video-transcript[open] summary>span{transform:rotate(45deg)}
.video-transcript-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:34px 38px;padding:20px 0 35px}
.video-transcript-grid .eyebrow{font-size:10px;letter-spacing:.03em;color:#ff815b;margin-bottom:14px}
.video-transcript-grid article>p:not(.eyebrow){font-size:12px;line-height:1.95;color:#c3cec4;margin-bottom:12px}
.video-transcript-grid article>p:last-child{margin-bottom:0}
.video-afterword{display:flex;justify-content:space-between;gap:25px;align-items:center;margin-top:28px}
.video-afterword p{font-family:var(--serif);font-size:18px;margin:0}
.video-afterword a{font-size:11px;color:#d6dfd2}
.video-afterword a span{margin-left:17px;color:var(--orange)}
.video-switcher{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px;margin:0 0 42px}
.video-switcher a{display:flex;align-items:center;gap:15px;min-width:0;padding:17px 20px;border:1px solid #536158;background:#253239;transition:border-color .2s,background .2s}
.video-switcher a:hover{background:#2e3d43;border-color:#ff815b}
.video-switcher a>span{font-family:Georgia,serif;font-size:19px;color:#ff815b}
.video-switcher strong{font-size:13px;font-weight:550}
.video-switcher time{font-size:11px;color:#b6c4be;margin-left:auto;font-variant-numeric:tabular-nums}
.video-switcher b{font-size:14px;font-weight:400;color:#ff815b}
.video-feature{scroll-margin-top:28px}
.video-feature-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:32px;margin-bottom:25px}
.video-feature-heading .eyebrow{font-size:10px;color:#ff815b;margin-bottom:12px;letter-spacing:.08em}
.video-feature-heading h3{font-family:var(--serif);font-size:28px;font-weight:500;line-height:1.65;margin:0}
.video-feature-heading>p{font-size:12px;color:#b6c4be;line-height:1.9;margin:0 0 4px}
.ontology-feature{border-top:1px solid #536158;margin-top:57px;padding-top:50px}
.ontology-frame{background-image:url('ontology-video-poster.jpg')}
@media(min-width:781px) and (max-width:1000px){.header{gap:18px}.header nav{gap:13px;font-size:11px}.nav-buy span{margin-left:10px}.video-layout{grid-template-columns:minmax(0,1fr) 245px;gap:23px}}
@media(max-width:780px){.video-section{padding-top:43px;padding-bottom:44px}.video-section .section-heading>p{margin-top:19px}.video-layout{grid-template-columns:1fr;gap:30px}.video-label-time{font-size:13px}.video-meta{flex-wrap:wrap;gap:8px 20px;line-height:1.7}.video-scenes .eyebrow{margin-bottom:5px}.video-scene-hint{font-size:17px;margin-bottom:18px}.video-chapters{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0 25px}.video-chapters button{grid-template-columns:18px minmax(0,1fr) 30px;gap:7px;font-size:12px;min-height:60px}.video-actions{gap:24px;margin-top:22px}.video-transcript{margin-top:29px}.video-transcript-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:28px 25px}.video-afterword{align-items:flex-start;flex-direction:column;gap:14px;margin-top:26px}.video-afterword p{font-size:18px}}
@media(max-width:480px){.video-chapters{grid-template-columns:1fr}.video-chapters button{grid-template-columns:25px minmax(0,1fr) 36px;gap:13px;min-height:52px;font-size:13px}.video-chapters time{font-size:10px}.video-transcript-grid{grid-template-columns:1fr;gap:25px}.video-player-bar{gap:10px;align-items:flex-start;font-size:9px}.video-player-bar>div{gap:6px;align-items:baseline}.video-dot{margin-top:5px}.video-section .section-label{font-size:9px;letter-spacing:.07em}.video-section .section-heading h2{font-size:32px}.video-afterword a{font-size:10px}.video-meta{font-size:9px}}
@media(max-width:780px){.video-switcher{gap:11px;margin-bottom:33px}.video-switcher a{padding:14px;gap:10px;flex-wrap:wrap}.video-switcher strong{font-size:12px}.video-switcher time{font-size:10px}.video-feature-heading{align-items:flex-start;flex-direction:column;gap:13px;margin-bottom:24px}.video-feature-heading h3{font-size:24px}.video-feature-heading>p{font-size:11px;margin:0}.ontology-feature{margin-top:43px;padding-top:35px}}
@media(max-width:480px){.video-switcher{grid-template-columns:1fr;gap:9px}.video-switcher a{padding:13px 16px;flex-wrap:nowrap}.video-feature-heading h3{font-size:23px}}