/* weight-science.com: one stylesheet, no framework, no JS needed. */
@font-face{font-family:"Newsreader";src:url(/assets/fonts/newsreader-var.woff2) format("woff2");font-weight:400 700;font-style:normal;font-display:swap}
@font-face{font-family:"Source Sans 3";src:url(/assets/fonts/sourcesans3-normal.woff2) format("woff2");font-weight:400 700;font-style:normal;font-display:swap}
@font-face{font-family:"Source Sans 3";src:url(/assets/fonts/sourcesans3-italic.woff2) format("woff2");font-weight:400 700;font-style:italic;font-display:swap}

:root{
  color-scheme:light;
  --ink:#182e34; --text:#25363c; --muted:#5d6c70; --faint:#8a9599;
  --paper:#fbf8f2; --card:#ffffff; --sand:#f2ecdf; --sage:#e4eeea; --mist:#eef3f1;
  --line:#ddd5c4; --line-soft:#e9e3d6;
  --link:#245f50; --link-hover:#163f35; --amber:#c98a34; --amber-ink:#8a5414;
  --serif:"Newsreader",Georgia,"Times New Roman",serif;
  --sans:"Source Sans 3",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --wrap:1240px; --gutter:clamp(16px,4vw,40px); --radius:14px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{margin:0;background:var(--paper);color:var(--text);font:400 1.125rem/1.66 var(--sans);overflow-x:hidden}
img,svg,picture{max-width:100%;height:auto;display:block}
a{color:var(--link);text-decoration-thickness:1px;text-underline-offset:.18em}
a:hover{color:var(--link-hover);text-decoration-thickness:2px}
:focus-visible{outline:3px solid var(--amber);outline-offset:2px;border-radius:4px}
h1,h2,h3,h4{font-family:var(--serif);color:var(--ink);font-weight:620;line-height:1.16;letter-spacing:-.01em;margin:0}
p,ul,ol{margin:0 0 1.05em}
strong{color:var(--ink)}
.skip{position:absolute;left:-999px;top:0;background:var(--ink);color:#fff;padding:.6rem 1rem;z-index:10}
.skip:focus{left:8px;top:8px}

/* ---------- header / footer */
.site-head{background:var(--paper);border-bottom:1px solid var(--line-soft)}
.site-head__inner{max-width:var(--wrap);margin:0 auto;padding:.85rem var(--gutter);display:flex;align-items:center;justify-content:space-between;gap:1.5rem}
.brand{display:flex;align-items:center;gap:.6rem;text-decoration:none;color:var(--ink);flex:none}
.brand__name{font-family:var(--serif);font-size:1.32rem;font-weight:650;letter-spacing:-.015em}
.brand__name span{color:var(--link);margin-left:.18em}
.site-nav ul{list-style:none;margin:0;padding:0;display:flex;gap:.2rem}
.site-nav a{display:block;padding:.42rem .7rem;border-radius:999px;color:var(--text);text-decoration:none;font-size:.95rem;white-space:nowrap}
.site-nav a:hover{background:var(--sand)}
.site-nav a[aria-current="page"]{background:var(--ink);color:#f6f1e6}
@media (max-width:1060px){
  .site-head__inner{flex-direction:column;align-items:flex-start;gap:.55rem;padding-bottom:.55rem}
  .site-nav{width:100%;overflow-x:auto;scrollbar-width:none;-webkit-mask-image:linear-gradient(90deg,#000 88%,transparent);mask-image:linear-gradient(90deg,#000 88%,transparent)}
  .site-nav::-webkit-scrollbar{display:none}
  .site-nav ul{width:max-content;padding-right:2rem}
}
.site-foot{background:var(--ink);color:#d9e1df;margin-top:5rem}
.site-foot__inner{max-width:var(--wrap);margin:0 auto;padding:3.2rem var(--gutter) 1.5rem;display:grid;grid-template-columns:minmax(0,1.6fr) minmax(0,1fr) minmax(0,1fr);gap:2.5rem}
.site-foot a{color:#f6f1e6;text-decoration-color:rgba(246,241,230,.4)}
.site-foot ul{list-style:none;padding:0;margin:0;display:grid;gap:.45rem;font-size:.95rem}
.site-foot__brand{font-family:var(--serif);font-size:1.4rem;color:#f6f1e6;margin-bottom:.5rem}
.site-foot__head{font-weight:700;color:#f6f1e6;margin-bottom:.7rem}
.site-foot__note{font-size:.92rem;color:#b9c6c3}
.site-foot__legal{max-width:var(--wrap);margin:0 auto;padding:1rem var(--gutter) 2rem;font-size:.85rem;color:#9fb0ac;border-top:1px solid rgba(246,241,230,.12)}
@media (max-width:820px){.site-foot__inner{grid-template-columns:minmax(0,1fr)}}

/* ---------- shared bits */
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.eyebrow{font-size:.8rem;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--amber-ink);margin:0 0 .7rem}
.dek{font-size:1.18rem;line-height:1.55;color:var(--muted);max-width:40rem}
.btn{display:inline-block;background:var(--ink);color:#f6f1e6;text-decoration:none;padding:.72rem 1.25rem;border-radius:999px;font-weight:700}
.btn:hover{background:#0f2025;color:#fff}
.btn--ghost{background:transparent;color:var(--ink);box-shadow:inset 0 0 0 1.5px var(--ink)}
.btn--ghost:hover{background:var(--ink);color:#f6f1e6}
.crumbs{display:flex;gap:.5rem;font-size:.88rem;color:var(--faint);margin-bottom:1.1rem;flex-wrap:wrap}
.crumbs a{color:var(--muted)}
.byline{display:flex;flex-wrap:wrap;gap:.35rem 1.1rem;font-size:.92rem;color:var(--muted);margin:1.3rem 0 0}
.byline span+span::before{content:"";display:inline-block;width:4px;height:4px;border-radius:50%;background:var(--faint);margin-right:1.1rem;vertical-align:middle}

/* ---------- figures */
.fig{margin:0}
.fig img{width:100%;height:auto;border-radius:var(--radius)}
.fig figcaption{font-size:.88rem;color:var(--muted);margin-top:.6rem;line-height:1.5}
.fig--chart{background:var(--card);border:1px solid var(--line-soft);border-radius:var(--radius);padding:clamp(.8rem,2vw,1.4rem)}
.fig--chart img{border-radius:0;width:100%;max-width:620px;margin:0 auto}
.fig--chart figcaption{max-width:620px;margin-left:auto;margin-right:auto}

/* ---------- article hero */
.a-hero{max-width:var(--wrap);margin:0 auto;padding:2.6rem var(--gutter) 2.4rem;display:grid;gap:2.5rem;align-items:center}
.a-hero--media{grid-template-columns:minmax(0,1.05fr) minmax(0,1fr)}
.a-hero h1{font-size:clamp(2.1rem,4.4vw,3.45rem);margin-bottom:1rem}
.a-hero .fig img{aspect-ratio:3/2;object-fit:cover}
@media (max-width:900px){.a-hero--media{grid-template-columns:minmax(0,1fr)}.a-hero{padding-top:1.6rem;gap:1.6rem}}

/* ---------- key takeaways (Q&A at top) */
.takeaways{background:var(--sage);padding:2.4rem 0 2.6rem}
.takeaways__inner{max-width:var(--wrap);margin:0 auto;padding:0 var(--gutter)}
.takeaways__head{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;flex-wrap:wrap;margin-bottom:1.3rem}
.takeaways__head h2{font-size:clamp(1.45rem,2.6vw,1.85rem)}
.takeaways__head p{margin:0;color:var(--muted);font-size:.95rem}
.qa-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,17rem),1fr));gap:1rem}
.takeaways .qa{background:var(--card);border-radius:var(--radius);padding:1.25rem 1.3rem 1.1rem;border:1px solid #d3e2dc}
.qa .q{font-family:var(--serif);font-size:1.16rem;font-weight:620;color:var(--ink);line-height:1.25;margin:0 0 .55rem}
.qa .a p{margin:0 0 .6em}
.qa .a p:last-child{margin:0}

/* ---------- body grid: TOC | prose | notes rail */
.a-body{max-width:var(--wrap);margin:0 auto;padding:2.8rem var(--gutter) 0;display:grid;grid-template-columns:13rem minmax(0,1fr);gap:3rem;align-items:start}
.toc{position:sticky;top:1.4rem;font-size:.93rem;padding-top:.3rem}
.toc__label{font-weight:700;color:var(--ink);margin-bottom:.6rem;font-size:.82rem;letter-spacing:.1em;text-transform:uppercase}
.toc ol{list-style:none;margin:0;padding:0;counter-reset:t;display:grid;gap:.15rem}
.toc li{counter-increment:t}
.toc a{display:grid;grid-template-columns:1.6rem 1fr;padding:.32rem .5rem .32rem .2rem;border-radius:8px;color:var(--muted);text-decoration:none;line-height:1.35}
.toc a::before{content:counter(t,decimal-leading-zero);color:var(--faint);font-size:.78rem;padding-top:.15rem}
.toc a:hover{background:var(--sand);color:var(--ink)}
.flow{display:grid;grid-template-columns:minmax(0,41rem) minmax(0,16.5rem);column-gap:3rem;align-items:start}
.flow>*{grid-column:1}
.flow>.note{grid-column:2;grid-row:span 3;margin-top:.35rem}
.flow>.wide{grid-column:1/-1;margin:1.6rem 0 2rem}
.flow h2{font-size:clamp(1.55rem,2.6vw,2.05rem);margin:2.6rem 0 .9rem;scroll-margin-top:1rem}
.flow>h2:first-child{margin-top:0}
.flow h3{font-size:1.28rem;margin:1.7rem 0 .55rem}
.flow p,.flow li{font-size:1.14rem}
.flow ul,.flow ol{padding-left:1.25rem}
.flow li{margin-bottom:.4em}
.flow li::marker{color:var(--amber-ink)}
@media (max-width:1199px){
  .a-body{grid-template-columns:minmax(0,1fr);gap:1.8rem}
  .toc{position:static;background:var(--card);border:1px solid var(--line-soft);border-radius:var(--radius);padding:1.1rem 1.2rem}
  .toc ol{grid-template-columns:repeat(auto-fill,minmax(min(100%,15rem),1fr))}
}
@media (max-width:899px){
  .flow{grid-template-columns:minmax(0,1fr)}
  .flow>.note{grid-column:1;grid-row:auto;margin:.4rem 0 1.4rem}
  .flow>.wide{margin:1.2rem 0 1.6rem}
}

/* margin notes */
.note{background:var(--sand);border-radius:var(--radius);padding:1rem 1.1rem;font-size:.93rem;line-height:1.5}
.note p{margin:0 0 .5em}
.note p:last-child{margin:0}
.note__k{font-family:var(--serif);font-size:2rem;line-height:1;color:var(--amber-ink);font-weight:650;display:block;margin-bottom:.35rem}
.note__src{color:var(--muted);font-size:.84rem}
.note--plain{background:var(--mist)}

/* tables */
.table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;background:var(--card);border:1px solid var(--line-soft);border-radius:var(--radius)}
.table-wrap table{width:100%;border-collapse:collapse;font-size:.97rem;min-width:36rem}
.table-wrap caption{caption-side:top;text-align:left;padding:1rem 1.1rem .4rem;font-family:var(--serif);font-size:1.15rem;color:var(--ink);font-weight:620}
.table-wrap th,.table-wrap td{padding:.72rem 1.1rem;text-align:left;vertical-align:top;border-top:1px solid var(--line-soft)}
.table-wrap thead th{background:var(--sand);font-size:.86rem;letter-spacing:.02em;color:var(--ink);border-top:0}
.table-wrap tbody tr:nth-child(even){background:#fcfaf6}
.table-wrap .num{text-align:right;white-space:nowrap;font-variant-numeric:tabular-nums}
.table-note{font-size:.86rem;color:var(--muted);padding:.2rem 1.1rem 1rem;margin:0}

/* emotional block: image + copy */
.moment{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:clamp(1.2rem,3vw,2.6rem);align-items:center;background:var(--mist);border-radius:calc(var(--radius) + 6px);padding:clamp(1rem,2.4vw,1.8rem)}
.moment .fig img{aspect-ratio:3/2;object-fit:cover}
.moment__text h3{font-size:clamp(1.35rem,2.2vw,1.7rem);margin-bottom:.7rem}
.moment__text p{font-size:1.07rem}
.moment__text p:last-child{margin-bottom:0}
.moment--flip .fig{order:2}
@media (max-width:760px){.moment{grid-template-columns:minmax(0,1fr)}.moment--flip .fig{order:0}}

/* in-flow call to the next step */
.next-step{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem 1rem;background:var(--card);border:1px solid var(--line);border-radius:999px;padding:.7rem 1.2rem;font-size:.98rem;margin:.4rem 0 1.4rem}
.next-step b{color:var(--amber-ink);font-weight:700}
@media (max-width:560px){.next-step{border-radius:var(--radius)}}

/* FAQ, sources, next reads */
.faq,.sources,.next-reads{max-width:var(--wrap);margin:0 auto;padding:3.2rem var(--gutter) 0}
.faq>h2,.sources>h2,.next-reads>h2{font-size:clamp(1.55rem,2.6vw,2.05rem);margin-bottom:1.3rem}
.faq__grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1.1rem 2.4rem}
.faq .qa{padding:1.1rem 0 .4rem;border-top:1px solid var(--line)}
.faq .qa .q{font-size:1.2rem}
@media (max-width:760px){.faq__grid{grid-template-columns:minmax(0,1fr)}}
.sources ol{font-size:.93rem;color:var(--muted);padding-left:1.3rem;columns:2 26rem;column-gap:3rem}
.sources li{margin-bottom:.65rem;break-inside:avoid;overflow-wrap:anywhere}
.sources__how{font-size:.93rem;color:var(--muted);max-width:44rem}
.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,17.5rem),1fr));gap:1.3rem}
.card{background:var(--card);border:1px solid var(--line-soft);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;text-decoration:none;color:var(--text);transition:transform .15s ease,box-shadow .15s ease}
.card:hover{transform:translateY(-2px);box-shadow:0 10px 28px -16px rgba(24,46,52,.45);color:var(--text)}
.card .fig img{border-radius:0;aspect-ratio:3/2;object-fit:cover}
.card__body{padding:1.05rem 1.15rem 1.25rem}
.card__kicker{font-size:.78rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--amber-ink);margin:0 0 .35rem}
.card h3{font-size:1.25rem;margin-bottom:.45rem}
.card p{font-size:.97rem;color:var(--muted);margin:0}
@media (prefers-reduced-motion:reduce){.card{transition:none}.card:hover{transform:none}}

/* ---------- home */
.home-hero{max-width:var(--wrap);margin:0 auto;padding:3rem var(--gutter) 2.6rem;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);gap:3rem;align-items:center}
.home-hero h1{font-size:clamp(2.4rem,5.2vw,4.1rem);margin-bottom:1.1rem;letter-spacing:-.02em}
.home-hero .dek{font-size:1.24rem}
.home-hero .fig img{aspect-ratio:4/3;object-fit:cover}
.home-hero__ctas{display:flex;flex-wrap:wrap;gap:.7rem;margin-top:1.6rem}
@media (max-width:900px){.home-hero{grid-template-columns:minmax(0,1fr);padding-top:1.8rem;gap:1.8rem}}
.toc--inline{position:static;max-width:var(--wrap);margin:0 auto;padding:1.6rem var(--gutter) 0}
.toc--inline ol{display:flex;flex-wrap:wrap;gap:.5rem}
.toc--inline a{display:inline-flex;gap:.45rem;background:var(--card);border:1px solid var(--line-soft);border-radius:999px;padding:.38rem .9rem}
.toc--inline a::before{padding-top:.08rem}
.section{max-width:var(--wrap);margin:0 auto;padding:3.4rem var(--gutter) 0}
.section>h2{font-size:clamp(1.65rem,3vw,2.3rem);margin-bottom:.9rem;scroll-margin-top:1rem}
.section__lede{max-width:44rem;font-size:1.12rem}
.split{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:2.6rem;align-items:start}
@media (max-width:860px){.split{grid-template-columns:minmax(0,1fr)}}

/* ---------- simple pages, 404 */
.article--page .a-hero{padding-bottom:1.6rem}
.article--page .flow{grid-template-columns:minmax(0,44rem) minmax(0,16.5rem)}
@media (max-width:899px){.article--page .flow{grid-template-columns:minmax(0,1fr)}}
.notfound{max-width:46rem;margin:0 auto;padding:4rem var(--gutter) 1rem}
.notfound h1{font-size:clamp(2.2rem,5vw,3.2rem);margin-bottom:1rem}
.notfound__list{columns:2 14rem;margin:1.4rem 0 2rem}