@font-face{font-family:Architects;src:url("fonts/ArchitectsDaughter-Regular.ttf") format("truetype");font-display:swap}
@font-face{font-family:"Whiteboard Hand SC";src:url("fonts/WhiteboardHandSC-Regular.woff2") format("woff2");font-style:normal;font-weight:400;font-display:swap}
:root{--paper:#f5f4ef;--ink:#23262c;--soft:#777a7a;--blue:#2a5cb3;--orange:#ce785a;--line:#d7d7cf}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif}a{color:inherit;text-decoration:none}a:hover{text-decoration:underline;text-underline-offset:5px}button,input,select{font:inherit}button,a,input,select{touch-action:manipulation}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid var(--blue);outline-offset:5px}.masthead{max-width:1480px;margin:auto;padding:34px 48px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{font-size:13px;line-height:1.15;font-weight:750;letter-spacing:.06em;position:relative}.brand-mark{font-family:Architects;font-size:40px;float:left;margin-right:12px;line-height:.9;color:var(--orange)}nav{display:flex;gap:34px;font-size:13px}.edition,.eyebrow{font-size:10px;letter-spacing:.15em;font-weight:700}.edition{color:var(--soft)}main{max-width:1480px;margin:auto;padding:0 48px}.hero{padding-top:60px}.eyebrow{display:flex;gap:10px;align-items:center}.dot{height:7px;width:7px;background:var(--orange);border-radius:50%}.hero-copy{display:grid;grid-template-columns:1.35fr 1fr;gap:8%;align-items:end;padding:35px 0 54px}h1{font-size:clamp(58px,6.5vw,96px);font-weight:500;letter-spacing:-.065em;line-height:.99;margin:0}h1 em{font-family:Architects;font-size:1.1em;font-style:normal;letter-spacing:-.07em;color:var(--blue);position:relative}h1 em:after{content:"";position:absolute;left:0;right:-10px;bottom:-6px;border-bottom:4px solid 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a{white-space:nowrap}.chapter-strip{display:grid;grid-template-columns:repeat(5,1fr);border-bottom:1px solid var(--line);margin:22px 0 0;padding-bottom:20px;gap:20px}.chapter-strip button{border:0;padding:8px 0;text-align:left;background:none;cursor:pointer;line-height:1.6;font-size:11px}.chapter-strip small{display:block;color:var(--orange);font:12px monospace}.chapter-strip button:hover{color:var(--blue)}.lab,.notes{padding:105px 0 0}.section-heading{display:grid;grid-template-columns:1.35fr 1fr;gap:8%;align-items:end;margin-bottom:36px}h2{font-size:54px;font-weight:500;letter-spacing:-.055em;line-height:1.07;margin:18px 0 0}.section-heading p{font-size:14px;line-height:1.7;max-width:380px;margin:0}.lab-toolbar{display:flex;align-items:center;justify-content:space-between;padding:18px 0;border-top:1px solid var(--line);font-size:11px}.lab-toolbar label{display:flex;align-items:center;gap:15px}select{border:1px solid #bfc2bd;background:transparent;padding:10px 30px 10px 12px;color:var(--ink);max-width:260px}.legend{display:flex;gap:8px;align-items:center;color:var(--soft);font-size:10px}.ink{display:inline-block;width:16px;height:3px;border-radius:3px;margin-left:10px}.black{background:var(--ink)}.blue{background:var(--blue)}.orange{background:var(--orange)}.comparison{display:grid;grid-template-columns:1fr 1fr;gap:20px}.comparison video{display:block;width:100%;aspect-ratio:16/9;background:#eae9e5;box-shadow:0 2px 6px #23262c0a}.video-label{display:flex;gap:14px;align-items:center;font-size:10px;line-height:1.7;padding:15px 0}.video-label b{font:26px Architects;color:var(--orange)}.video-label small{font-size:10px;color:var(--soft)}.comparison figcaption{font:10px monospace;color:var(--soft);padding:12px 0}.frame-controls{display:flex;gap:10px;align-items:center;margin-top:9px}.frame-controls button{background:transparent;border:1px solid #aeb2ae;padding:10px 13px;cursor:pointer;font-size:11px}.frame-controls button:hover{background:#e7e9e4}.frame-controls button:nth-child(2){min-width:112px}input[type=range]{flex:1;accent-color:var(--blue);min-width:60px;margin:0 10px}.frame-entry{font-size:10px;color:var(--soft);white-space:nowrap}.frame-entry input{background:transparent;border:0;border-bottom:1px solid #aaa;width:60px;padding:10px 4px;font:11px monospace}.lab-note{font-family:Architects;color:var(--blue);font-size:17px;min-height:24px}.evidence{display:grid;grid-template-columns:1fr 1fr 1fr 1.3fr;border-top:1px solid var(--line);border-bottom:1px solid var(--line);margin-top:32px;padding:26px 0;gap:20px;align-items:center}.evidence strong{display:block;font-size:24px;font-weight:400;letter-spacing:-.035em}.evidence span{font-size:10px;color:var(--soft)}.evidence a{font-size:12px;justify-self:end}.fineprint{font-size:10px;color:var(--soft);line-height:1.65;max-width:850px;margin-top:18px}.note-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:48px;padding-top:10px}.note-grid article{border-top:1px solid var(--ink);padding-top:18px}.note-number{font:26px Architects;color:var(--orange)}h3{font-size:21px;letter-spacing:-.025em;font-weight:500;margin:24px 0 12px}.note-grid p{font-size:13px;line-height:1.8;max-width:320px}.build-links{display:flex;gap:35px;font-size:12px;padding-top:30px}.sources{padding:85px 0}.sources #source-list{display:grid;grid-template-columns:1fr 1fr;gap:0 50px;margin-top:25px}.source{padding:20px 0;border-top:1px solid var(--line);display:grid;grid-template-columns:40px 1fr;gap:10px;font-size:12px;line-height:1.7}.source b{font:12px monospace;color:var(--orange);padding-top:3px}.source p{margin:5px 0;font-size:10px;color:var(--soft)}footer{border-top:1px solid var(--line);padding:36px 0 45px;display:flex;justify-content:space-between;gap:30px;align-items:center}footer p,footer span{font-size:10px;color:var(--soft);line-height:1.8}footer span{text-align:right}footer p a{color:var(--ink)}
@media(max-width:900px){.masthead{padding:24px}.edition{display:none}main{padding:0 24px}.hero-copy{gap:35px;grid-template-columns:1.1fr 1fr}h1{font-size:65px}.intro .handwritten{font-size:23px}.section-heading{gap:35px}h2{font-size:44px}.legend{display:none}.note-grid{gap:25px}.evidence{grid-template-columns:repeat(3,1fr)}.evidence a{grid-column:1/-1;justify-self:start}.frame-entry{display:none}}
@media(max-width:620px){.masthead{padding:20px}.brand{font-size:10px}nav{gap:18px;font-size:11px}main{padding:0 20px}.hero{padding-top:38px}.hero-copy{grid-template-columns:1fr;gap:40px;padding:28px 0 32px}h1{font-size:64px}.intro{max-width:none}.intro .handwritten{display:none}.intro p{font-size:14px;margin-top:0}.intro .film-title{margin-top:18px}.watch-link{margin-top:18px}.screen{padding:5px 5px 0}.screen figcaption{font-size:8px;line-height:1.6;padding:12px 3px}.screen figcaption span{max-width:65%}.chapter-strip{grid-template-columns:repeat(3,1fr);gap:8px}.lab,.notes{padding-top:65px}.section-heading{grid-template-columns:1fr;gap:24px}h2{font-size:42px}.comparison{grid-template-columns:1fr;gap:10px}.comparison figcaption{padding-bottom:0}.lab-toolbar{justify-content:flex-start}.frame-controls{flex-wrap:wrap}.frame-controls input[type=range]{flex-basis:100%;order:4;margin:12px 0}.evidence{gap:14px}.evidence strong{font-size:21px}.evidence span{font-size:9px}.note-grid{grid-template-columns:1fr;gap:30px}.note-grid h3{margin-top:14px}.note-grid p{max-width:none}.build-links{flex-wrap:wrap;gap:20px}.sources #source-list{grid-template-columns:1fr}.sources{padding:60px 0}footer{flex-wrap:wrap}footer p{max-width:200px}footer span{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

.review-links{display:flex;flex-direction:column;align-items:flex-end;gap:12px}
@media(max-width:900px){.review-links{grid-column:1/-1;align-items:flex-start}}

.make-film{padding-top:105px}.repository-link{display:flex;justify-content:space-between;align-items:center;gap:30px;padding:32px 0;border-top:1px solid var(--ink);border-bottom:1px solid var(--line)}.repository-link small{display:block;font-size:10px;letter-spacing:.14em;color:var(--soft)}.repository-link strong{display:block;font-size:clamp(28px,4vw,48px);font-weight:500;letter-spacing:-.045em;margin:12px 0}.repository-link span span{font-size:13px;line-height:1.6}.repository-link b{font:60px Architects;color:var(--blue)}.repository-link:hover{text-decoration:none}.repository-link:hover strong{color:var(--blue)}.start-steps{list-style:none;padding:0;margin:40px 0;display:grid;grid-template-columns:1.45fr 1fr 1fr;gap:36px}.step-number{font:27px Architects;color:var(--orange)}.start-steps h3{margin:16px 0 12px}.start-steps p,.starter-prompt p{font-size:13px;line-height:1.8}.start-steps a{font-size:12px;border-bottom:1px solid var(--line);padding-bottom:5px}.start-steps pre{font-size:11px;line-height:1.8;background:#e9e8e1;padding:16px;white-space:pre-wrap;overflow-wrap:anywhere;border-left:2px solid var(--blue)}.starter-prompt{padding:30px 32px;background:#e9ece5;border-left:3px solid var(--orange)}.starter-prompt blockquote{font:23px/1.65 Architects;margin:20px 0;color:var(--blue);max-width:950px}.starter-prompt p{max-width:720px;color:#555b5c;margin-bottom:0}@media(max-width:900px){.start-steps{grid-template-columns:1fr;gap:26px}.start-steps li{border-bottom:1px solid var(--line);padding-bottom:25px}}@media(max-width:620px){.make-film{padding-top:65px}.repository-link{gap:16px}.repository-link b{font-size:40px}.repository-link strong{font-size:30px}.starter-prompt{padding:24px}.starter-prompt blockquote{font-size:20px}}

/* Keep the wordmark intact and give page language its own place in the masthead. */
.masthead{display:grid;grid-template-columns:auto 1fr auto;gap:32px}
.brand{display:inline-flex;align-items:center;gap:12px;flex-shrink:0}
.brand-mark{float:none;flex:none;display:block;width:40px;height:40px;margin:0;line-height:1}
.brand-name{display:block;white-space:nowrap;line-height:1.2}
.masthead nav{justify-content:center}
.header-tools{display:flex;align-items:center;gap:24px}
.language-switch{display:inline-flex;border:1px solid var(--line);border-radius:3px;overflow:hidden;flex-shrink:0}
.language-switch button{border:0;background:transparent;color:var(--soft);min-width:44px;min-height:36px;padding:8px 10px;cursor:pointer;font-size:11px;line-height:1.2;white-space:nowrap}
.language-switch button+button{border-left:1px solid var(--line)}
.language-switch button[aria-pressed=true]{background:var(--ink);color:var(--paper)}
.language-switch button:hover{color:var(--blue)}
.language-switch button[aria-pressed=true]:hover{color:white}
.language-switch button:focus-visible{outline-offset:-3px}

/* Both editions are visible, with one clearly marked current page. */
.film-actions{display:flex;flex-direction:column;align-items:flex-start;gap:18px;margin-top:28px}
.edition-picker{display:flex;flex-direction:column;align-items:stretch;gap:8px;width:100%;margin:0;font-size:11px;letter-spacing:.03em}
.edition-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.edition-choice{display:flex;align-items:center;justify-content:center;min-height:46px;padding:11px 10px;border:1px solid #b8b3a8;border-radius:3px;font-size:12px;line-height:1.5;text-align:center;letter-spacing:0}
.edition-choice:hover{border-color:var(--blue);color:var(--blue);text-decoration:none}
.edition-choice[aria-current=page]{background:var(--ink);border-color:var(--ink);color:var(--paper)}
.edition-choice[aria-current=page]:hover{color:white}
.watch-link{gap:30px;min-height:42px;margin:0;padding:8px 0;white-space:nowrap}
.watch-link span{font:inherit;color:inherit}
.watch-link .watch-arrow{font-size:25px;line-height:1;color:var(--orange)}
.section-heading>p{justify-self:end}
.chapter-strip{grid-template-columns:repeat(var(--chapter-count,5),minmax(0,1fr))}
.repository-link{justify-content:flex-start}

/* Pair the Latin lettering with real pen-written CJK glyphs, hosted locally. */
html[lang=zh-CN] body{font-family:"PingFang SC","Microsoft YaHei","Noto Sans CJK SC",sans-serif}
html[lang=zh-CN] h1{font-size:clamp(48px,5.4vw,82px);line-height:1.2;letter-spacing:-.04em}
html[lang=zh-CN] h1 em,html[lang=zh-CN] .handwritten,html[lang=zh-CN] .starter-prompt blockquote{font-family:Architects,"Whiteboard Hand SC",cursive;font-weight:400;font-synthesis:none;letter-spacing:.015em}
html[lang=zh-CN] h1 em{font-size:1.05em;letter-spacing:0;white-space:nowrap}
html[lang=zh-CN] h2{line-height:1.25;letter-spacing:-.035em}
html[lang=zh-CN] .eyebrow{letter-spacing:.08em}
html[lang=zh-CN] .starter-prompt blockquote{line-height:1.9}
html[lang=zh-CN] .source{line-height:1.9}

@media(max-width:1100px){.header-tools{gap:16px}.masthead nav{gap:24px}.edition{font-size:9px;letter-spacing:.08em}}
@media(max-width:900px){.masthead{gap:24px}.header-tools .edition{display:none}.section-heading>p{max-width:100%}}
@media(max-width:620px){
  .masthead{grid-template-columns:1fr auto;gap:20px;padding:20px}
  .masthead nav{grid-column:1/-1;grid-row:2;justify-content:space-between;gap:16px;padding-top:16px;border-top:1px solid var(--line)}
  .header-tools{grid-column:2;grid-row:1}
  .brand{font-size:11px;gap:10px}.brand-mark{width:34px;height:34px}
  h1{font-size:clamp(34px,11.2vw,64px)}
  .film-actions{gap:18px 24px;margin-top:24px}
  .watch-link{margin-top:0}.chapter-strip{grid-template-columns:repeat(3,minmax(0,1fr))}
  .section-heading>p{justify-self:start}
  html[lang=zh-CN] h1{font-size:clamp(34px,9.6vw,54px)}
  html[lang=zh-CN] h2{font-size:38px}
}

/* Keep the source acknowledgement readable in both desktop and mobile footers. */
footer{display:block}
.footer-main{display:flex;justify-content:space-between;gap:30px;align-items:center}
.source-credit{max-width:none;margin:24px 0 0;padding-top:20px;border-top:1px solid var(--line);font-size:11px;line-height:1.9;color:var(--soft)}
.source-credit a{color:var(--ink);text-decoration:underline;text-decoration-thickness:1px;text-underline-offset:3px}
@media(max-width:620px){.footer-main{flex-wrap:wrap;gap:20px}.source-credit{margin-top:22px}}