/* The Solo Thesis. A technical paper, typeset for a screen:
   Night bands for the cover and the colophon, Paper for reading. */
@font-face{font-family:"Archivo";src:url("fonts/archivo-latin-wght-normal.woff2") format("woff2");font-weight:100 900;font-style:normal;font-display:swap}
@font-face{font-family:"STIX Two Text";src:url("fonts/stix-two-text-latin-600-normal.woff2") format("woff2");font-weight:600;font-style:normal;font-display:swap}
@font-face{font-family:"STIX Two Text";src:url("fonts/stix-two-text-latin-700-normal.woff2") format("woff2");font-weight:700;font-style:normal;font-display:swap}
@font-face{font-family:"STIX Two Text";src:url("fonts/stix-two-text-latin-600-italic.woff2") format("woff2");font-weight:600;font-style:italic;font-display:swap}
@font-face{font-family:"STIX Two Text";src:url("fonts/stix-two-text-latin-700-italic.woff2") format("woff2");font-weight:700;font-style:italic;font-display:swap}

:root{
  color-scheme:light;
  --night:#0A0F1C; --ink:#14213D; --paper:#F5F1E8; --paper-2:#EAE4D5;
  --signal:#F2552C; --signal-text:#B8380F; --slate:#5C677D; --sand:#E3D5B8;
  --muted-night:#A3ACBD; --muted-paper:#4E586C;
  --line-night:#2A3654; --line-paper:#D5CCB8; --line-strong:#5C677D;
  --serif:"STIX Two Text",Georgia,"Times New Roman",serif;
  --sans:"Archivo",system-ui,-apple-system,"Segoe UI",sans-serif;
  --wrap:1120px; --read:44rem;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--night);font-family:var(--sans);font-size:1.0625rem;line-height:1.65;font-variant-numeric:lining-nums}
img{max-width:100%;height:auto;display:block}
a{color:var(--signal-text);text-underline-offset:.18em;text-decoration-thickness:1px}
a:hover{text-decoration-thickness:2px}
:focus-visible{outline:2px solid var(--signal);outline-offset:3px}
h1,h2,h3{font-family:var(--serif);font-weight:700;line-height:1.08;letter-spacing:-.015em;margin:0;text-wrap:balance}
p{margin:0}
.wrap{max-width:var(--wrap);margin-inline:auto;padding-left:max(20px,env(safe-area-inset-left,0px));padding-right:max(20px,env(safe-area-inset-right,0px))}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;background:var(--paper);color:var(--night);padding:8px 12px;z-index:20}

/* ---------- Night bands */
.night{background:var(--night);color:var(--paper)}
.night a{color:var(--paper)}
.site-head .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 32px;padding-block:18px}
.brand{display:block;flex:none}
.brand img{height:34px;width:auto}
.nav{display:flex;flex-wrap:wrap;gap:6px 26px;list-style:none;margin:0;padding:0;font-size:.97rem;font-weight:500}
.nav a{text-decoration:none;color:var(--muted-night);padding-block:6px;display:inline-block;border-bottom:2px solid transparent}
.nav a:hover{color:var(--paper)}
.nav a[aria-current="page"]{color:var(--paper);border-bottom-color:var(--signal)}

.hero{position:relative;overflow:hidden;border-top:1px solid var(--line-night)}
.hero .device{position:absolute;right:-140px;top:-60px;width:720px;height:720px;pointer-events:none}
.hero .wrap{position:relative;display:grid;grid-template-columns:minmax(0,1fr);gap:40px;padding-block:72px 80px}
.hero.has-figure .wrap{grid-template-columns:minmax(0,1.25fr) minmax(0,.75fr);align-items:end;padding-bottom:0}
.hero.has-figure .copy{padding-bottom:80px}
.hero h1{font-size:clamp(2.4rem,5.4vw,4.3rem);line-height:1;letter-spacing:-.025em;max-width:18ch}
.hero.page h1{font-size:clamp(2.1rem,4.4vw,3.4rem);max-width:20ch}
.hero h1 em{font-style:italic;color:var(--signal)}
.hero .lead{margin-top:24px;font-size:1.22rem;line-height:1.55;color:var(--muted-night);max-width:38rem}
.hero .lead strong{color:var(--paper);font-weight:600}
.kicker{font-size:.97rem;font-weight:600;color:var(--muted-night);margin-bottom:20px}
.kicker a{color:var(--muted-night);text-decoration:none}
.kicker a:hover{color:var(--paper);text-decoration:underline}
.kicker span{font-weight:400}
.hero figure{margin:0;align-self:end}
.hero figure img{width:100%;max-width:420px;margin-left:auto}
.actions{display:flex;flex-wrap:wrap;gap:12px 16px;margin-top:34px}
.btn{display:inline-block;font-weight:600;font-size:1rem;line-height:1.2;padding:14px 22px;text-decoration:none;border:1px solid var(--line-strong);color:inherit}
.btn:hover{border-color:currentColor}
.btn.primary{background:var(--signal);border-color:var(--signal);color:var(--night)}
.night .btn.primary{color:var(--night)}
.btn.primary:hover{background:#ff6a41;border-color:#ff6a41}

/* ---------- Paper sections */
main section{padding-block:64px}
main section + section{border-top:1px solid var(--line-paper)}
.section-head{display:grid;gap:14px;margin-bottom:36px;max-width:var(--read)}
.section-head h2{font-size:clamp(1.7rem,3vw,2.3rem)}
.section-head p{color:var(--muted-paper);font-size:1.1rem}
.label{font-size:.95rem;font-weight:600;color:var(--muted-paper)}
.label b{color:var(--night);font-weight:600}

.grid{display:grid;gap:28px}
.cols-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.cols-2{grid-template-columns:repeat(2,minmax(0,1fr))}

.stat{display:flex;flex-direction:column;gap:10px;border-top:2px solid var(--night);padding-top:16px;min-width:0}
.stat .num{font-size:clamp(3.2rem,6vw,4.6rem);font-weight:700;line-height:1;letter-spacing:-.03em;font-variant-numeric:tabular-nums lining-nums}
.stat .num i{font-style:normal;color:var(--signal-text)}
.stat p{font-size:1.04rem;line-height:1.5}
.source{font-size:.9rem;line-height:1.45;color:var(--muted-paper);border-top:1px solid var(--line-paper);padding-top:9px;margin-top:auto}
.source b{font-weight:600}
.note{font-size:.95rem;color:var(--muted-paper);max-width:var(--read);margin-top:28px}

.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:0;border-top:1px solid var(--line-paper)}
.card{display:flex;flex-direction:column;gap:10px;padding:28px 28px 30px 0;border-bottom:1px solid var(--line-paper);text-decoration:none;color:var(--night);min-width:0}
.card:nth-child(even){padding-left:28px;padding-right:0;border-left:1px solid var(--line-paper)}
.card h3{font-size:1.5rem}
.card p{color:var(--muted-paper)}
.card .go{font-weight:600;color:var(--signal-text);margin-top:4px}
.card:hover h3{text-decoration:underline;text-decoration-thickness:2px;text-underline-offset:.15em}

.split{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:48px;align-items:start}
.plain-list{list-style:none;margin:0;padding:0;border-top:1px solid var(--line-paper)}
.plain-list li{padding:18px 0;border-bottom:1px solid var(--line-paper);display:grid;gap:4px}
.plain-list b{font-family:var(--serif);font-size:1.25rem;font-weight:600;letter-spacing:-.01em}
.plain-list span{color:var(--muted-paper)}

/* ---------- Reading pages */
.article{display:grid;grid-template-columns:minmax(0,var(--read)) minmax(0,1fr);gap:56px;padding-block:56px 72px}
.article.single{grid-template-columns:minmax(0,var(--read))}
.prose{display:flex;flex-direction:column;gap:20px;min-width:0}
.prose h2{font-size:1.8rem;margin-top:28px}
.prose h3{font-size:1.3rem;font-weight:600;margin-top:12px}
.prose ul,.prose ol{margin:0;padding-left:1.25em;display:flex;flex-direction:column;gap:10px}
.prose li::marker{color:var(--muted-paper)}
.prose strong{font-weight:600}
.abstract{background:var(--paper-2);border-top:2px solid var(--night);padding:22px 24px 24px;display:grid;gap:10px}
.abstract p{font-size:1.08rem;line-height:1.6}
.figure{margin:8px 0;display:grid;gap:12px}
.figure .stat{border-top:1px solid var(--line-paper)}
.figure-row{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:28px}
.definition{border-left:0;border-top:2px solid var(--night);border-bottom:1px solid var(--line-paper);padding:22px 0 24px;display:grid;gap:10px}
.definition p{font-family:var(--serif);font-weight:600;font-size:1.45rem;line-height:1.3;letter-spacing:-.01em}
.table-scroll{overflow-x:auto}
table{border-collapse:collapse;width:100%;font-size:1rem;min-width:30rem}
th,td{text-align:left;vertical-align:top;padding:12px 16px 12px 0;border-bottom:1px solid var(--line-paper)}
thead th{font-weight:600;border-bottom:2px solid var(--night)}
tbody th{font-weight:600;width:28%}
.refs{font-size:.95rem;line-height:1.5;color:var(--muted-paper);display:flex;flex-direction:column;gap:10px;list-style:none;padding:0;margin:0}
.refs li{padding-left:1.6em;text-indent:-1.6em;overflow-wrap:anywhere}
.refs a{color:var(--muted-paper)}
.faq{display:grid;gap:0;border-top:1px solid var(--line-paper)}
.faq div{padding:20px 0;border-bottom:1px solid var(--line-paper);display:grid;gap:8px}
.faq h3{font-size:1.25rem;font-weight:600;margin:0}
.aside{display:flex;flex-direction:column;gap:28px;font-size:.98rem;align-self:start;position:sticky;top:24px;min-width:0}
.aside .box{border-top:2px solid var(--night);padding-top:14px;display:grid;gap:10px}
.aside ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.aside p{color:var(--muted-paper)}
.cta{background:var(--ink);color:var(--paper)}
.cta .wrap{padding-block:56px;display:grid;grid-template-columns:minmax(0,1fr) auto;gap:28px 48px;align-items:center}
.cta h2{font-size:clamp(1.6rem,3vw,2.2rem);max-width:22ch}
.cta p{color:var(--muted-night);margin-top:10px;max-width:38rem}
.cta .actions{margin-top:0}
.byline{display:flex;flex-wrap:wrap;gap:6px 18px;font-size:.97rem;color:var(--muted-night);margin-top:22px}
.byline b{color:var(--paper);font-weight:600}
.about-photo{background:var(--night);padding:28px 28px 0}
.about-photo img{width:100%}
.contact-line{font-size:1.25rem;font-weight:600;overflow-wrap:anywhere}

/* ---------- Footer */
.site-foot{border-top:1px solid var(--line-night)}
.site-foot .wrap{padding-block:48px 36px;display:grid;grid-template-columns:minmax(0,1.3fr) repeat(2,minmax(0,1fr));gap:36px 48px}
.site-foot img{height:30px;width:auto}
.site-foot p{color:var(--muted-night);font-size:.97rem;margin-top:14px;max-width:24rem}
.site-foot h2{font-family:var(--sans);font-size:.95rem;font-weight:600;letter-spacing:0;color:var(--paper);margin-bottom:12px}
.site-foot ul{list-style:none;margin:0;padding:0;display:grid;gap:8px;font-size:.97rem}
.site-foot a{color:var(--muted-night);text-decoration:none}
.site-foot a:hover{color:var(--paper);text-decoration:underline}
.site-foot .legal{grid-column:1/-1;border-top:1px solid var(--line-night);padding-top:18px;font-size:.88rem;color:var(--muted-night);display:flex;flex-wrap:wrap;gap:6px 24px;justify-content:space-between}

@media (max-width:880px){
  .hero.has-figure .wrap{grid-template-columns:minmax(0,1fr)}
  .hero.has-figure .copy{padding-bottom:0}
  .hero figure img{max-width:300px;margin-inline:auto}
  .hero .device{right:-260px;top:auto;bottom:-260px;opacity:.7}
  .cols-3,.cols-2,.split,.article,.cards,.figure-row{grid-template-columns:minmax(0,1fr)}
  .card,.card:nth-child(even){padding:24px 0;border-left:0}
  .aside{position:static}
  .split{gap:8px}
  .split .section-head{margin-bottom:16px}
  .cta .wrap{grid-template-columns:minmax(0,1fr)}
  .site-foot .wrap{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .site-foot .about{grid-column:1/-1}
  main section{padding-block:48px}
  .hero .wrap{padding-block:48px 56px}
}
@media (max-width:520px){
  body{font-size:1rem}
  .brand img{height:30px}
  .nav{gap:2px 18px;font-size:.93rem}
  .site-foot .wrap{grid-template-columns:minmax(0,1fr)}
}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
@media print{.site-head .nav,.cta,.hero .device{display:none}.night{background:#fff;color:#000}}