/* Four independent studies; the original site's files are untouched. */
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*{box-sizing:border-box}
html{scroll-padding-top:76px;scrollbar-gutter:stable}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased}
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::selection{color:var(--paper);background:var(--ink)}
img{max-width:100%;display:block}
em{font-weight:400}
figure,p,h1,h2{margin:0}
button{padding:0}
.eyebrow{font:400 10px/1.6 var(--mono);letter-spacing:.08em;text-transform:uppercase}
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.text-button>span:last-child{transition:transform .25s}
.text-button:hover>span:last-child{transform:translate(2px,-2px)}
.text-button:hover{text-decoration:underline;text-underline-offset:5px}
.skip-link{position:fixed;top:65px;left:20px;transform:translateY(-180px);z-index:200;background:var(--ink);color:var(--paper);padding:16px}
.skip-link:focus{transform:none}
.study-bar{height:var(--bar-height);position:sticky;top:0;z-index:50;background:#111;color:#e5e5e5;border-bottom:1px solid #333;display:flex;align-items:center;gap:24px;padding:0 28px;font:400 10px var(--mono);letter-spacing:.025em}
.study-label{color:#9b9b9b;white-space:nowrap;display:flex;gap:24px}
.study-label>span{color:#555}
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.original-link span{font-size:16px}
.site-header{height:114px;margin:0 64px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:30px}
.brand{display:inline-flex;align-items:center;gap:14px;font-size:22px;letter-spacing:-1px;min-height:44px;white-space:nowrap;flex-shrink:0}
.brand img{width:28px;height:33px;object-fit:contain}
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.brand-zero::after{content:'';height:14px;width:1px;background:currentColor;position:absolute;top:9px;left:6px;transform:rotate(30deg)}
.header-note{font-size:11px;color:var(--muted);letter-spacing:.015em}
.header-actions{display:flex;align-items:center;gap:36px}
.site-footer{margin:0 64px;padding:28px 0;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:24px;font-size:11px;color:var(--muted)}
.site-footer>span:first-child{letter-spacing:-.03em;color:var(--ink);font-size:14px}
.site-footer .text-button{font-size:11px}
.letter-experience{min-height:calc(100svh - var(--bar-height));background:#f5f5f5;position:relative}
.letter-main{max-width:1184px;margin:0 auto;padding:70px 48px 0}
.heading-kicker{display:flex;justify-content:space-between;color:var(--muted)}
.letter-heading{border-bottom:1px solid var(--ink);padding-bottom:28px}
.letter-heading h1{font:400 clamp(64px,7.6vw,112px)/1.06 var(--serif);letter-spacing:-.025em;margin-top:17px}
.letter-heading h1 em{white-space:nowrap}
.paper-layout{display:grid;grid-template-columns:225px 1fr 50px;gap:48px;padding-top:54px}
.letter-details{display:flex;flex-direction:column;align-items:flex-start;padding-top:5px}
.detail-block{display:flex;flex-direction:column;gap:8px;font-size:12px;margin-bottom:28px}
.detail-block>.eyebrow{color:var(--muted);font-size:9px}
.letter-seal{width:76px;height:76px;border:1px solid #9a9a9a;border-radius:50%;display:flex;align-items:center;justify-content:center;margin-top:45px;font:400 47px/1 var(--serif);transform:rotate(-15deg);position:relative}
.letter-seal::after{content:'';position:absolute;inset:5px;border:1px solid #b5b5b5;border-radius:50%}
.letter-seal span{margin-right:-6px;transform:translateY(-3px)}
.letter-seal i{transform:translateY(3px);font-weight:400;font-size:45px}
.detail-tail{margin-top:21px;color:#797979;font-size:8px;letter-spacing:.02em}
.letter-body{font:400 19px/1.7 Georgia,'Times New Roman',serif;letter-spacing:-.025em}
.letter-paragraph{margin-bottom:22px;text-wrap:pretty}
.letter-paragraph:last-of-type{margin-bottom:0}
.letter-body .salutation{margin-bottom:27px}
.signature{margin-top:36px;display:flex;flex-direction:column;align-items:flex-start;gap:7px;font:400 16px/1.6 Georgia,serif;letter-spacing:0}
.signature-name{font:italic 47px/1.1 var(--serif);letter-spacing:-.02em;display:block}
.signature-dot{margin-left:-5px}
.letter-postscript{margin-top:55px;padding-top:22px;border-top:1px solid var(--line);display:flex;justify-content:space-between;align-items:center;gap:16px}
.letter-postscript .eyebrow{font-size:8px;letter-spacing:.03em;color:var(--muted)}
.letter-postscript>span:last-child{font:400 13px var(--sans);letter-spacing:-.03em}
.paper-edge{display:flex;flex-direction:column;align-items:center;gap:24px;font:400 10px var(--mono);color:#858585;padding-top:10px}
.paper-edge>span:first-child{writing-mode:vertical-rl}
.paper-edge>span:last-child{font:24px var(--serif)}
.paper-edge>div{height:105px;width:1px;background:var(--line)}
.letter-next{margin:64px 98px 55px 273px;border-top:1px solid var(--ink);padding-top:17px;display:flex;flex-direction:column;gap:15px}
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.letter-next:hover>span:last-child>span{transform:translate(3px,-3px)}
.letter-next>span:last-child>span{transition:transform .2s;font:300 24px var(--sans)}
.end-mark{margin:30px 0;font:16px var(--sans)}
/* II. The Margin — a dark reading room and a visible archive. */
body[data-experience=margin],body[data-experience=observatory]{--ink:#e7e7e7;--muted:#939393;--paper:#101010;--line:#303030;background:var(--paper)}
.margin-experience,.observatory-experience{background:var(--paper);min-height:calc(100svh - var(--bar-height))}
.margin-experience .brand img,.observatory-experience .brand img{filter:invert(1)}
.margin-experience .site-header{height:103px}
.margin-experience .brand,.observatory-experience .brand{font-size:20px}
.manuscript-grid{max-width:1600px;padding:55px 64px 80px;margin:auto;display:grid;grid-template-columns:220px minmax(360px,640px) 148px;gap:66px;justify-content:space-between;align-items:start}
.manuscript-sidebar{position:sticky;top:94px}
.sidebar-heading>.eyebrow{color:var(--muted);font-size:9px}
.sidebar-volume{font:400 117px/1 var(--serif);display:block;letter-spacing:-.07em;margin:20px 0 25px}
.sidebar-volume>span{color:#666}
.volume-tabs{display:flex;gap:25px;border-bottom:1px solid var(--line);margin-bottom:14px}
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.volume-tabs button:hover{color:#eee}
.manuscript-nav-item{display:grid;grid-template-columns:19px 1fr 12px;gap:13px;padding:17px 0;border-bottom:1px solid #262626;align-items:baseline;font-size:12px;line-height:1.6;color:#949494}
.manuscript-nav-item>.eyebrow{color:#888;font-size:9px;letter-spacing:0}
.manuscript-nav-item>span:last-child{opacity:0;transition:opacity .2s}
.manuscript-nav-item.is-current,.manuscript-nav-item:hover{color:#f0f0f0}
.manuscript-nav-item.is-current>span:last-child,.manuscript-nav-item:hover>span:last-child{opacity:1}
.sidebar-colophon{margin-top:90px;max-width:175px;color:#999}
.tiny-cross{font:400 26px var(--mono);color:#aaa}
.sidebar-colophon p{font:italic 23px/1.3 var(--serif);margin:17px 0}
.sidebar-colophon>.eyebrow{font-size:8px;color:#878787}
.manuscript-meta{display:flex;justify-content:space-between;gap:10px;color:var(--muted);font-size:9px}
.manuscript-main h1{font:400 clamp(58px,7vw,102px)/.95 var(--serif);letter-spacing:-.025em;margin:29px 0 34px}
.manuscript-main h1 em{color:#c0c0c0}
.manuscript-rule{padding:14px 0;border-top:1px solid #767676;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;color:var(--muted)}
.manuscript-rule>.eyebrow{font-size:8px}
.manuscript-body{padding-top:37px;font:400 18px/1.85 Georgia,serif;letter-spacing:-.02em;color:#cecece}
.manuscript-body .letter-paragraph{margin-bottom:22px}
.manuscript-body .salutation{font-style:italic;font-size:23px;color:#efefef;margin-bottom:26px}
.manuscript-body .signature{margin-top:35px}
.manuscript-body .signature-name{font-size:46px;color:#e5e5e5}
.manuscript-next{display:flex;flex-direction:column;gap:14px;border-top:1px solid var(--line);margin-top:53px;padding-top:22px}
.manuscript-next>.eyebrow{color:var(--muted);font-size:8px}
.manuscript-next>span:last-child{display:flex;justify-content:space-between;gap:20px;font:30px var(--serif)}
.manuscript-next:hover{color:#fff}
.marginalia{padding-top:300px;color:var(--muted)}
.marginalia>.eyebrow{font-size:8px;color:#999}
.margin-note{border-top:1px solid var(--line);margin-top:27px;padding-top:14px;display:flex;flex-direction:column;gap:12px;font-size:11px;line-height:1.6}
.note-number{font:italic 26px var(--serif);color:#cacaca}
.margin-note>.eyebrow{font-size:8px;color:#919191;letter-spacing:0}
.margin-infinity{display:block;font:400 46px var(--serif);margin-top:115px;color:#888}
.is-focused .manuscript-grid{display:block;max-width:840px;padding-top:55px}
.is-focused .manuscript-sidebar,.is-focused .marginalia{display:none}
.is-focused .manuscript-body{font-size:21px}
.is-focused .manuscript-main h1{font-size:104px}
/* III. The Signal — one letter, given room to become a statement. */
body[data-experience=signal]{--paper:#f3f3f3;--ink:#151515;--muted:#6b6b6b;--line:#c7c7c7;background:var(--paper)}
.signal-experience{background:var(--paper);overflow:clip}
.signal-experience .site-header{margin:0 54px;height:101px}
.signal-intro{position:relative;margin:0 54px;padding:35px 0 34px;min-height:calc(100svh - 153px);display:flex;flex-direction:column;isolation:isolate}
.signal-topline{display:flex;justify-content:space-between;gap:20px;font-size:9px;color:var(--muted)}
.signal-intro h1{font:500 clamp(100px,15.2vw,245px)/.91 var(--sans);letter-spacing:-.085em;margin:48px 0 51px;max-width:1120px;text-wrap:balance}
.signal-intro h1>span{margin-left:-.015em}
.signal-intro-bottom{display:flex;align-items:flex-end;justify-content:space-between;margin-top:auto;gap:30px}
.signal-sender{display:flex;align-items:center;gap:15px;font-size:11px;line-height:1.7}
.signal-sender img{height:40px;width:34px;object-fit:contain}
.signal-read{display:flex;align-items:center;gap:45px;font-size:12px;line-height:1.6}
.round-arrow{display:flex;align-items:center;justify-content:center;width:59px;height:59px;border:1px solid #aaa;border-radius:50%;font:300 29px var(--sans);transition:background .25s,color .25s,transform .25s;flex:none}
.signal-read:hover .round-arrow{background:var(--ink);color:var(--paper);transform:translateY(3px)}
.signal-watermark{font:400 430px/.8 var(--serif);position:absolute;right:-22px;top:30%;letter-spacing:-.15em;color:#ddd;z-index:-1;transform:rotate(-12deg);opacity:.52;user-select:none;pointer-events:none}
.signal-reading{background:#141414;color:#efefef;padding:28px 70px 90px;display:grid;grid-template-columns:28% 1fr;gap:7%;position:relative}
.signal-reading-aside{position:sticky;top:135px;align-self:start;margin-top:75px;color:#aaa}
.signal-reading-aside>.eyebrow{font-size:9px}
.signal-progress{height:170px;width:1px;background:#444;margin:31px 0}
.signal-progress>div{height:25%;background:#f0f0f0;width:1px;transition:height .5s}
.signal-passage{position:relative;display:flex;flex-direction:column;justify-content:center;min-height:72svh;padding:90px 0 92px;border-bottom:1px solid #3a3a3a}
.signal-passage:last-child{border-bottom:0}
.passage-count{font-size:9px;color:#949494;margin-bottom:28px}
.signal-passage>div{font:400 clamp(27px,3.05vw,47px)/1.42 var(--sans);letter-spacing:-.035em;text-wrap:pretty}
.signal-passage.is-reading .passage-count{color:#f5f5f5}
.passage-marker{font:300 23px var(--sans);position:absolute;right:0;bottom:25px;color:#858585;transition:transform .8s,color .8s}
.is-reading .passage-marker{transform:rotate(90deg);color:#eee}
.signal-outro{padding:85px 70px 65px;min-height:78svh;display:flex;flex-direction:column}
.signal-outro>.eyebrow{color:var(--muted);font-size:9px}
.signal-outro h2{font:400 clamp(95px,13vw,190px)/.85 var(--sans);letter-spacing:-.085em;margin:45px 0 65px}
.signal-outro h2 em{font-family:var(--serif);font-size:1.2em;font-weight:400;letter-spacing:-.03em}
.signal-outro-bottom{display:flex;align-items:center;justify-content:space-between;gap:25px;margin-top:auto}
.signal-outro-bottom>.signature-name{font-size:39px}
.signal-outro-bottom .text-button{font-size:12px;max-width:50%}
/* Bonus. Observatory — a living plate of Earth, followed by the letter. */
.observatory-experience{--paper:#080808;--line:#2d2d2d}
.observatory-experience .site-header{height:102px;margin:0 56px}
.observatory-experience .header-note{display:flex;align-items:center;gap:9px}
.status-dot{width:4px;height:4px;border-radius:50%;background:#d4d4d4}
.observatory-hero{min-height:calc(100svh - 154px);padding:60px 56px 52px;display:grid;grid-template-columns:1.04fr 1.06fr;align-items:center;gap:10px;position:relative;max-width:1740px;margin:auto}
.observatory-copy{position:relative;z-index:1;padding-bottom:30px}
.observatory-kicker{display:flex;gap:13px;align-items:center;font-size:8px;color:#a2a2a2;letter-spacing:.055em}
.crosshair-small{font:400 17px var(--sans);color:#ddd}
.observatory-copy h1{font:400 clamp(66px,6.7vw,106px)/.98 var(--serif);letter-spacing:-.025em;margin-top:30px}
.observatory-copy h1 em{color:#b5b5b5}
.observatory-copy>p{font:400 12px var(--sans);color:#999;margin:28px 0 32px}
.observatory-read{font-size:11px;gap:27px}
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.globe-figure{position:relative;min-width:0;align-self:center;margin-top:20px}
.globe-coordinates{display:flex;justify-content:space-between;font-size:8px;letter-spacing:.08em;color:#929292;margin:0 25px 10px}
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#globe{width:100%;height:100%;display:block;cursor:grab;touch-action:pan-y;outline-offset:-20px}
#globe:active{cursor:grabbing}
.globe-cross{position:absolute;font:300 20px var(--mono);color:#767676;pointer-events:none}
.globe-cross-a{left:8px;top:50%}
.globe-cross-b{right:8px;top:50%}
.globe-figure figcaption{display:flex;align-items:center;justify-content:space-between;gap:15px;border-top:1px solid var(--line);margin:0 25px;padding-top:9px;color:#969696}
.globe-figure figcaption>.eyebrow{font-size:7px;letter-spacing:.025em}
.globe-pause{font:400 9px var(--mono);gap:7px}
.globe-instruction{font-size:7px;text-align:center;display:block;color:#8a8a8a;letter-spacing:.05em;margin-top:20px}
.observatory-side-label{position:absolute;right:14px;top:50%;writing-mode:vertical-rl;font-size:7px;color:#898989;letter-spacing:.055em}
.observatory-letter{padding:100px 12% 110px 10%;border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1.4fr;gap:10%;background:#111}
.observatory-letter>aside>.eyebrow{font-size:8px;color:#aaa}
.observatory-letter h2{font:400 clamp(49px,5vw,76px)/1 var(--serif);margin:22px 0 30px;letter-spacing:-.025em}
.observatory-letter h2 em{color:#b5b5b5}
.observatory-letter .letter-body{font-size:18px;color:#cecece}
.observatory-asterisk{display:block;font:400 85px var(--serif);color:#777;margin-top:90px}
.observatory-index{margin-top:45px;border-bottom:1px solid #555;font-family:var(--sans);letter-spacing:0;min-height:43px;gap:50px;font-size:11px}
.observatory-experience .site-footer{margin:0 56px}
/* The shared index is a working table of contents, with full-text search. */
.index-open{overflow:hidden}
.index-dialog{position:fixed;inset:0 0 0 auto;margin:0;width:min(660px,100%);height:100%;max-height:100%;max-width:100%;border:0;border-left:1px solid #999;background:#efefef;color:#171717;padding:35px 45px 28px;overflow:auto;overscroll-behavior:contain;z-index:100}
.index-dialog::backdrop{background:rgba(0,0,0,.66);backdrop-filter:blur(5px)}
.index-top{display:flex;align-items:center;justify-content:space-between;gap:20px}
.index-top>.eyebrow{font-size:8px;color:#686868}
.icon-button{width:40px;height:40px;font:400 18px var(--sans);display:flex;align-items:center;justify-content:center;border:1px solid #bbb;border-radius:50%}
.icon-button:hover{background:#171717;color:#f5f5f5}
.index-dialog h2{font:400 65px/.99 var(--serif);letter-spacing:-.02em;margin:30px 0 35px}
.index-dialog h2 em{color:#777}
.search-wrap{display:flex;align-items:center;gap:14px;border-bottom:1px solid #777;padding-bottom:11px}
.search-wrap>span{font:400 27px var(--sans);margin-top:-3px}
.search-wrap input{min-width:0;width:100%;border:0;background:transparent;color:#171717;font-size:12px;line-height:1.5;padding:8px 0;border-radius:0}
.search-wrap input:focus{outline:none}
.search-wrap:focus-within{border-bottom-color:#000;box-shadow:0 1px 0 #000}
.search-wrap kbd{font:8px var(--mono);color:#777;border:1px solid #bbb;padding:4px}
.index-filters{display:flex;gap:25px;margin-top:17px}
.index-filters button{font-size:11px;color:#666;min-height:44px;border-bottom:1px solid transparent}
.index-filters button[aria-pressed=true]{border-color:#222;color:#111}
#index-count{margin:27px 0 9px;color:#686868;font-size:8px}
.index-result{display:grid;grid-template-columns:53px 1fr 24px;gap:14px;align-items:baseline;border-top:1px solid #c9c9c9;padding:21px 0;transition:padding .2s}
.index-result:hover{padding-left:7px}
.index-result>.eyebrow{font-size:8px;color:#6c6c6c}
.index-result-title{font:400 27px/1.2 var(--serif)}
.index-result-detail{display:block;font:400 9px/1.6 var(--sans);color:#696969;margin-top:7px}
.index-result-detail>span{margin:0 4px}
.index-result-arrow{font:300 21px var(--sans)}
.index-empty{font:400 33px/1.3 var(--serif);padding:35px 0 60px}
.index-empty>span{font:12px var(--sans);color:#777}
.index-foot{margin-top:28px;font:400 9px var(--mono);color:#737373}
.noscript{padding:50px}
.noscript a{text-decoration:underline}
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