.timeline-page{max-width:1100px;margin:auto}.timeline-hero{max-width:870px;padding:78px 0 36px}.timeline-hero h1{font-size:clamp(42px,5.2vw,74px)}.timeline-hero h1 em{color:var(--red);font-weight:400}.timeline-hero>.lede{font-size:22px;max-width:770px}.timeline-hero>p:not(.lede):not(.eyebrow){max-width:760px}.timeline-key{display:flex;flex-wrap:wrap;gap:12px 28px;margin:26px 0 16px;font-size:14px;font-weight:650}.timeline-key span{display:flex;align-items:center;gap:9px}.timeline-key i{width:10px;height:10px;border-radius:50%;display:inline-block}.key-event{background:var(--ink)}.key-forecast{background:var(--red)}.key-scenario{background:var(--blue)}.timeline-note{font-size:13px;color:var(--muted)}.timeline-jumps{display:grid;grid-template-columns:repeat(4,1fr);border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-bottom:40px}.timeline-jumps a{padding:21px 20px 22px 0;text-decoration:none;font-size:14px;line-height:1.4}.timeline-jumps a span{display:block;color:var(--red);font-weight:700;margin-bottom:7px;font-size:12px;letter-spacing:.06em}.timeline-controls{padding:28px;background:var(--wash);border:1px solid var(--line);border-radius:3px;margin-bottom:52px}.timeline-fields{display:grid;grid-template-columns:1fr 1fr;gap:20px}.timeline-fields label{display:flex;flex-direction:column;font-weight:650;font-size:13px;gap:7px}.timeline-fields input,.timeline-fields select{width:100%;min-width:0;border:1px solid #879084;border-radius:3px;background:#fffef8;color:var(--ink);padding:11px 12px;font-size:15px}.timeline-filters{display:flex;flex-wrap:wrap;gap:8px;border:0;margin:22px 0 0;padding:0}.timeline-filters legend{font-size:12px;font-weight:650;margin-bottom:8px}.timeline-filters button{border:1px solid #7b867b;background:transparent;border-radius:28px;padding:7px 15px;color:var(--ink);font-size:13px}.timeline-filters button[aria-pressed=true]{background:var(--ink);color:#fffef8;border-color:var(--ink)}.timeline-results-row{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-top:22px;font-size:13px}.timeline-results-row p{margin:0}.timeline-results-row button{font-size:13px;background:transparent;border:0;text-decoration:underline;text-underline-offset:4px;padding:6px 0;margin-left:17px;color:var(--ink)}.timeline-era{scroll-margin-top:24px;margin-bottom:74px}.timeline-era-heading{max-width:750px;margin:0 0 30px;padding:0 0 0 176px}.timeline-era-heading h2{font-size:36px;margin-bottom:15px}.timeline-era-heading .eyebrow{margin-bottom:12px}.timeline-era-heading>p:last-child{font-size:15px;color:var(--muted)}.timeline-track{list-style:none;margin:0;padding:0}.timeline-entry{display:grid;grid-template-columns:142px 1fr;gap:34px;position:relative;padding-bottom:24px}.timeline-entry:before{content:"";position:absolute;left:154px;top:18px;bottom:-18px;border-left:1px solid #a6aea3}.timeline-entry:last-child:before{bottom:24px}.timeline-entry:after{content:"";position:absolute;left:150px;top:23px;width:9px;height:9px;border-radius:50%;background:var(--ink);box-shadow:0 0 0 5px var(--paper)}.timeline-date{padding-top:17px;text-align:right;font-size:14px;font-weight:700;line-height:1.5}.timeline-date small{display:block;font-size:11px;font-weight:400;color:var(--muted);margin-top:5px}.timeline-card{padding:23px 29px 20px;background:#fffef9;border:1px solid var(--line);border-radius:4px}.timeline-card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:12px}.timeline-badge{font-size:11px;letter-spacing:.05em;text-transform:uppercase;font-weight:700;color:var(--muted)}.timeline-permalink{font-size:17px;text-decoration:none;color:var(--muted)}.timeline-card h3{font-family:Georgia,"Times New Roman",serif;font-size:28px;font-weight:400;line-height:1.17;letter-spacing:-.025em;margin-bottom:14px}.timeline-card>p{font-size:16px;line-height:1.65}.timeline-card .timeline-attribution{font-size:12px;color:var(--muted);margin-top:-3px;margin-bottom:14px}.timeline-reading{display:flex;flex-wrap:wrap;align-items:baseline;gap:5px 14px;margin:16px 0 9px;font-size:12px}.timeline-reading>span{font-size:10px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);width:100%;font-weight:650}.timeline-reading a{color:var(--blue)}.timeline-sources{border-top:1px solid var(--line);padding-top:9px;margin-top:14px;font-size:12px;color:var(--muted)}.timeline-sources summary{cursor:pointer;font-weight:600;width:fit-content}.timeline-sources[open] summary{margin-bottom:12px}.timeline-sources ul{padding-left:18px;margin-bottom:0}.timeline-sources p{margin-bottom:8px}.timeline-sources a{overflow-wrap:anywhere}.timeline-entry.forecasts:after{background:var(--red)}.timeline-entry.forecasts .timeline-badge{color:var(--red)}.timeline-entry.scenarios:after{background:var(--blue)}.timeline-entry.scenarios .timeline-badge{color:var(--blue)}#era-futures .timeline-entry:before{border-left-style:dashed}#era-futures .timeline-card{background:transparent}.timeline-entry:target .timeline-card{outline:2px solid var(--blue);outline-offset:3px}.timeline-empty{padding:40px;background:var(--wash)}.timeline-closing{padding:45px 0 70px;border-top:1px solid var(--line);max-width:800px;margin:auto}.timeline-closing .small{margin-top:28px;color:var(--muted)}.timeline-page [hidden]{display:none!important}@media(max-width:760px){.timeline-hero{padding-top:45px}.timeline-hero>.lede{font-size:19px}.timeline-jumps{grid-template-columns:1fr 1fr}.timeline-fields{grid-template-columns:1fr}.timeline-controls{padding:20px}.timeline-era-heading{padding-left:0}.timeline-era-heading h2{font-size:31px}.timeline-entry{grid-template-columns:1fr;gap:9px;padding-left:24px}.timeline-date{text-align:left;padding-top:0}.timeline-date small{display:inline;margin-left:8px}.timeline-entry:before{left:4px;top:9px;bottom:-9px}.timeline-entry:after{left:0;top:9px}.timeline-card{padding:21px}.timeline-card h3{font-size:25px}.timeline-results-row{align-items:flex-start}.timeline-results-row>div{display:flex;flex-wrap:wrap;justify-content:flex-end}.timeline-results-row button{white-space:nowrap}.timeline-closing h2{font-size:34px}}@media print{.site-header,.site-footer,.skip,.timeline-controls,.timeline-jumps,.timeline-permalink,.timeline-closing .actions{display:none!important}.timeline-hero{padding-top:10px}.timeline-hero h1{font-size:35px}.timeline-entry{grid-template-columns:110px 1fr;gap:22px;break-inside:avoid}.timeline-entry:before{left:120px}.timeline-entry:after{left:116px}.timeline-card{padding:15px}.timeline-card h3{font-size:22px}.timeline-card>p{font-size:12px}.timeline-era-heading{padding-left:132px}.timeline-sources{font-size:10px}.timeline-era{margin-bottom:30px}.timeline-closing{padding-bottom:10px}}
.timeline-era-art{margin:0 0 32px 176px;max-width:760px}.timeline-era-art img{display:block;width:100%;height:auto;border-radius:4px}.timeline-era-art figcaption{font-size:11px;line-height:1.5;color:var(--muted);padding-top:9px}.timeline-era-art a{color:inherit}@media(max-width:760px){.timeline-era-art{margin-left:0}}@media print{.timeline-era-art{display:none}}

/* ChatGPT's evolution: the book's red line connects a growing scope of work. */
.chatgpt-story{border-top:2px solid var(--red);padding:36px 0 34px;margin:10px 0 46px}.chatgpt-story-heading{display:grid;grid-template-columns:1fr 1fr;column-gap:42px;align-items:start}.chatgpt-story-heading>.eyebrow{grid-column:1/-1}.chatgpt-story h2{font-size:clamp(34px,3.8vw,48px);line-height:1.06;margin:0}.chatgpt-story-heading>p:last-child{font-size:16px;line-height:1.7;margin:0}.chatgpt-origins{display:grid;grid-template-columns:150px 1fr;gap:24px;align-items:center;background:var(--wash);padding:18px 22px;margin:28px 0 36px}.chatgpt-origins-date{font-size:11px;line-height:1.7;text-transform:uppercase;letter-spacing:.06em}.chatgpt-origins-date strong{display:block;font:28px Georgia,serif;letter-spacing:-.03em;color:var(--red)}.chatgpt-origins p{font-size:14px;line-height:1.7;margin:0;max-width:740px}.chatgpt-origins a{color:inherit;text-underline-offset:3px}.chatgpt-stages{list-style:none;display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:0;margin:0;padding:0}.chatgpt-stages li{position:relative;border-top:1px solid var(--red);padding:23px 22px 0 0;display:flex;flex-direction:column}.chatgpt-stages li:before{content:"";position:absolute;top:-5px;left:0;width:9px;height:9px;border-radius:50%;background:var(--red);box-shadow:0 0 0 5px var(--paper)}.chatgpt-stage-year{font-size:12px;font-weight:750;color:var(--red);letter-spacing:.04em}.chatgpt-stages h3{font:24px/1.16 Georgia,serif;letter-spacing:-.025em;margin:13px 0}.chatgpt-stages p{font-size:13px;line-height:1.7;margin:0 0 18px}.chatgpt-stages a{font-size:12px;line-height:1.5;margin-top:auto;color:var(--blue);text-underline-offset:3px}.chatgpt-story-bottom{display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:40px;margin-top:32px;padding-top:24px;border-top:1px solid var(--line)}.chatgpt-story-bottom h3{font-size:16px;margin:0 0 8px}.chatgpt-story-bottom p{font-size:14px;line-height:1.7;margin:0;max-width:740px}.chatgpt-story-bottom .button{font-size:13px;white-space:nowrap}.chatgpt-story-note{font-size:11px;color:var(--muted);line-height:1.65;margin:22px 0 0;max-width:900px}.timeline-thread-badge{display:block;color:var(--blue);font-size:10px;font-weight:700;letter-spacing:.06em;text-transform:uppercase;margin-bottom:12px}.timeline-fields{grid-template-columns:1fr 1fr .85fr}#timeline-explore{scroll-margin-top:24px}.chatgpt-story a:focus-visible{outline:2px solid var(--blue);outline-offset:5px}
@media(max-width:900px){.chatgpt-story-heading{grid-template-columns:1fr;gap:18px}.chatgpt-stages{grid-template-columns:repeat(3,minmax(0,1fr));row-gap:32px}.chatgpt-story-bottom{grid-template-columns:1fr;gap:20px}.chatgpt-story-bottom .button{justify-self:start}.timeline-fields{grid-template-columns:1fr 1fr}.timeline-fields>label:first-child{grid-column:1/-1}}
@media(max-width:560px){.chatgpt-origins{grid-template-columns:1fr;gap:14px;padding:20px}.chatgpt-stages{grid-template-columns:1fr;row-gap:0}.chatgpt-stages li{border-top:0;border-left:1px solid var(--red);padding:0 0 28px 24px;margin-left:4px}.chatgpt-stages li:last-child{padding-bottom:0;border-left-color:transparent}.chatgpt-stages li:before{left:-5px;top:4px}.chatgpt-stages h3{font-size:25px;margin:8px 0}.chatgpt-stages p{font-size:14px;margin-bottom:9px;max-width:390px}.chatgpt-story-bottom .button{white-space:normal}.timeline-fields{grid-template-columns:1fr}.chatgpt-story-note{font-size:12px}}
@media print{.chatgpt-story{break-inside:avoid;padding:20px 0}.chatgpt-story-heading{display:block}.chatgpt-story h2{font-size:28px;margin-bottom:15px}.chatgpt-story-heading>p:last-child{font-size:12px}.chatgpt-stages{grid-template-columns:repeat(5,minmax(0,1fr))}.chatgpt-stages h3{font-size:17px}.chatgpt-stages p{font-size:10px}.chatgpt-story-bottom .button{display:none}.chatgpt-story-bottom{display:block}.chatgpt-story-note{font-size:9px}}

/* The dated chronology opens into a conceptual horizon. */
.singularity-horizon{position:relative;margin:46px 0 0;padding:44px 0 0;border-top:2px solid var(--red);scroll-margin-top:28px}.horizon-heading{display:grid;grid-template-columns:.85fr 1.3fr;gap:60px}.horizon-heading h2{font:clamp(60px,7.5vw,96px)/1 Georgia,serif;letter-spacing:-.055em;margin:18px 0 0;color:var(--red)}.horizon-heading>div>p:not(.eyebrow){font-size:16px;line-height:1.75;margin:0 0 16px}.horizon-heading strong{font-weight:650}.horizon-figure{margin:8px 0 30px}.horizon-figure svg{display:block;width:100%;height:auto;overflow:visible}.horizon-svg-small{font:11px Arial,sans-serif;letter-spacing:1.4px;fill:#576253}.horizon-svg-year{font:38px Georgia,serif;fill:#a6442c}.horizon-question-mark{font:38px Georgia,serif;fill:#687362;opacity:.6}.horizon-figure figcaption{font-size:12px;color:var(--muted);max-width:700px;margin:auto;text-align:center;line-height:1.6}.horizon-branch{transition:opacity .25s ease}.singularity-horizon[data-horizon-view=learning] .horizon-branch:not([data-horizon-branch=learning]),.singularity-horizon[data-horizon-view=creativity] .horizon-branch:not([data-horizon-branch=creativity]),.singularity-horizon[data-horizon-view=community] .horizon-branch:not([data-horizon-branch=community]){opacity:.32}.horizon-explore{background:var(--wash);padding:26px 30px 28px;border:1px solid var(--line);display:grid;grid-template-columns:1fr auto;gap:18px 24px}.horizon-explore-heading h3{font:25px/1.2 Georgia,serif;letter-spacing:-.02em;margin:0 0 8px}.horizon-explore-heading p{font-size:13px;margin:0;color:var(--muted)}.horizon-choices{display:flex;flex-wrap:wrap;gap:7px;align-self:start}.horizon-choices button{font-size:12px;color:var(--ink);background:transparent;border:1px solid #7b867b;border-radius:24px;padding:9px 14px;cursor:pointer}.horizon-choices button[aria-pressed=true]{background:var(--ink);color:#fffef8;border-color:var(--ink)}.horizon-choices button:focus-visible{outline:2px solid var(--blue);outline-offset:3px}.horizon-panels{grid-column:1/-1}.horizon-questions h3{font-size:12px;text-transform:uppercase;letter-spacing:.07em;color:var(--muted);margin:0 0 15px}.horizon-questions ol{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));list-style:none;margin:0;padding:0;gap:22px}.horizon-questions li{border-top:1px solid #9eaa99;padding-top:16px;font:22px/1.25 Georgia,serif;letter-spacing:-.02em}.horizon-foot{display:flex;justify-content:space-between;align-items:baseline;gap:35px;margin-top:19px;font-size:12px;line-height:1.65;color:var(--muted)}.horizon-foot p{max-width:480px;margin:0}.horizon-foot a{max-width:350px;color:inherit;text-underline-offset:3px}.timeline-note a{color:var(--blue);white-space:nowrap;text-underline-offset:3px}
@media(max-width:800px){.horizon-heading{grid-template-columns:1fr;gap:26px}.horizon-heading h2{margin-top:12px}.horizon-explore{grid-template-columns:1fr}.horizon-choices{justify-self:start}.horizon-foot{display:block}.horizon-foot p{margin-bottom:12px}.horizon-figure{margin-top:0}.horizon-figure figcaption{max-width:520px}}
@media(max-width:560px){.singularity-horizon{padding-top:30px}.horizon-heading>div>p:not(.eyebrow){font-size:15px}.horizon-explore{padding:22px 19px}.horizon-questions ol{grid-template-columns:1fr;gap:18px}.horizon-questions li{font-size:23px;padding-top:13px}.horizon-figure svg{min-height:180px}.horizon-svg-small{font-size:15px;letter-spacing:.2px}.horizon-svg-year{font-size:45px}.horizon-figure figcaption{font-size:11px}.horizon-choices button{padding:9px 12px}.horizon-questions h3{margin-bottom:13px}}
@media(prefers-reduced-motion:reduce){.horizon-branch{transition:none}}
@media print{.singularity-horizon{break-before:page;break-inside:avoid}.horizon-heading{grid-template-columns:.7fr 1.3fr;gap:24px}.horizon-heading h2{font-size:55px}.horizon-heading>div>p:not(.eyebrow){font-size:12px}.horizon-choices{display:none!important}.horizon-explore{display:block}.horizon-questions{margin-top:18px}.horizon-questions li{font-size:14px}.horizon-questions ol{grid-template-columns:repeat(3,1fr)}.horizon-figure{max-width:730px;margin:0 auto 20px}}
@media(max-width:560px){.horizon-svg-small{display:none}.horizon-svg-year{font-size:64px}.horizon-question-mark{font-size:55px}.horizon-figure svg path{vector-effect:non-scaling-stroke}}