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@media(max-width:767px){:root{--gutter:22px}body{font-size:15px}html{scroll-padding-top:76px}.header-inner{height:66px;gap:15px}.brand{font-size:23px}.header-actions{gap:8px}.ask-header{display:none}.primary-nav ul{grid-template-columns:repeat(2,1fr)}.admin-bar .site-header{top:46px}.hero{min-height:780px;height:100svh;max-height:920px}.hero-edition{top:91px;font-size:8px;letter-spacing:.08em}.hero-edition span:last-child{display:none}.hero-lab{opacity:.48;object-position:42% center}.scientist-layer{width:330px;height:495px;left:calc(58% - 165px);top:92px}.hero-art:after{background:linear-gradient(0deg,var(--paper) 0%,rgba(243,239,228,.96) 18%,transparent 60%)}.lab-note{left:8%;top:24%;font-size:13px}.diagram-orbit{left:2%;top:26%;width:90px;height:90px}.hero h1{top:35%;font-size:clamp(76px,17vw,128px);letter-spacing:-.035em;line-height:1.02;white-space:normal;left:15px;right:15px}.title-word{display:flex;justify-content:center}.hero-search{top:auto;bottom:75px}.hero-search>p{font-size:13px;margin-bottom:18px;line-height:1.65}.search-field{font-size:12px;padding:0 14px;height:56px}.search-form{min-height:58px}.search-submit{width:55px}.surprise-link{font-size:10px;margin-top:17px}.hero-scroll{bottom:20px;font-size:8px}.section-space{padding:58px var(--gutter)}.section-rule{margin-bottom:35px;gap:15px;padding-top:15px}.section-rule h2{font-size:15px}.section-rule>span{display:none}.daily-layout{display:flex;flex-direction:column;gap:30px;align-items:stretch}.daily-copy h3{font-size:42px;margin:18px 0}.daily-copy>p{font-size:14px;line-height:1.75;margin-bottom:25px}.daily-image{border:0;border-top:1px solid var(--line);padding:5px 15px 10px}.daily-image img{max-width:330px;aspect-ratio:1.2}.figure-label{bottom:0;font-size:8px}.button{font-size:10px;min-height:50px;padding:13px 20px;gap:24px}.section-heading{margin-bottom:35px}.section-heading h2{font-size:51px}.section-heading>p{font-size:11px;max-width:135px;padding-left:12px}.section-heading>p br{display:none}.editorial-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:38px 20px}.question-1{grid-column:1/-1;grid-row:auto}.question-1 .question-picture img{aspect-ratio:1.35;max-height:320px}.question-1 h3{font-size:36px}.question-2,.question-3,.question-5,.question-6,.question-7,.question-8{grid-column:span 1}.question h3{font-size:17px;line-height:1.3;padding-right:0;margin-top:10px}.question-1 h3{font:500 35px/1.15 var(--display)}.question-picture{margin-bottom:14px}.question-picture img{aspect-ratio:1.1}.question-meta{font-size:8px;letter-spacing:.04em;gap:8px;flex-wrap:wrap}.question-arrow{position:static;display:inline-block;margin-top:10px}.question-arrow svg{width:18px}.question-4{grid-column:1/-1;grid-template-columns:1fr 1fr;gap:0 15px}.question-4 h3{font-size:21px}.question-4 .question-picture img{aspect-ratio:1}.question-5 .question-picture img,.question-6 .question-picture img,.question-7 .question-picture img,.question-8 .question-picture img{aspect-ratio:1.15}.video-stage{min-height:520px;height:85svh}.video-instruction{top:92px;font-size:8px}.video-copy{bottom:14%;right:25px}.scrub-word{font-size:44px;max-width:520px;overflow-wrap:normal}.video-progress{bottom:34px}.video-dark video,.video-dark .video-poster{object-fit:cover;object-position:60% center}.video-dark .video-copy{bottom:13%}.video-dark .scrub-word{font-size:46px;max-width:340px}.video-dark .video-shade{background:linear-gradient(0deg,#000c,transparent 80%)}.video-dark .button{margin-top:22px}.categories{display:block}.index-intro{position:relative;min-height:185px;padding-right:105px}.index-intro h2{font-size:32px;margin-top:20px}.index-intro>img{position:absolute;right:-8px;bottom:22px;width:125px;margin:0}.editorial-index{font-size:9px}.category-index a{padding:19px 0;gap:18px}.category-index a>span{font-size:29px}.category-index small{font-size:9px}.strange-heading{display:grid;grid-template-columns:45px 1fr;gap:18px;margin-bottom:35px}.large-asterisk{font-size:90px;height:40px}.strange-heading h2{font-size:41px}.strange-heading p{grid-column:2;font-size:12px;margin-top:4px}.strange-heading p br{display:none}.strange-list article{grid-template-columns:18px 1fr 60px;gap:12px;min-height:112px}.strange-list h3{font-size:18px;line-height:1.35}.strange-number{font-size:9px}.strange-image img{height:75px;width:60px}.strange-arrow{display:none}.latest .section-rule{align-items:start}.text-link{font-size:9px;gap:9px}.text-link svg{width:17px}.latest-list article{grid-template-columns:1fr 20px;gap:10px;padding:22px 0}.latest-list time{grid-column:1/-1;font-size:9px}.latest-list h3{font-size:21px;line-height:1.35}.surprise{gap:20px;padding-block:45px 70px}.surprise>span{font-size:160px;width:80px}.surprise h2{font-size:38px;margin-bottom:25px}.surprise>p{display:none}.site-footer{padding:35px var(--gutter) 25px}.footer-main{display:block;padding-bottom:35px}.footer-main nav{margin-top:28px;gap:14px 25px;max-width:310px}.footer-bottom{display:flex;flex-wrap:wrap;gap:15px 25px;padding-right:60px;font-size:8px}.footer-bottom>a:last-child{margin:0}.scientist-launcher{right:10px;bottom:12px;width:64px;height:87px}.scientist-launcher img{width:64px;height:73px}.scientist-launcher span{font-size:8px;padding:4px 6px}.scientist-dialog{margin:auto auto 14px;padding:24px;max-height:calc(100svh - 28px)}.assistant-intro h2{font-size:28px}.assistant-description{font-size:12px}.search-dialog{padding:55px 22px 25px}.search-dialog h2{font-size:34px}.page-main,.archive-main{padding-top:110px}.page-main>h1,.archive-heading h1{font-size:46px}.archive-heading{margin-bottom:35px}.archive-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:40px 20px}.archive-grid .question h3{font-size:18px}.article-heading{padding-top:105px;padding-bottom:35px}.article-heading h1{font-size:44px;line-height:1.16}.article-heading .question-meta{margin-bottom:18px}.back-link{margin-bottom:25px}.article-figure{min-height:270px;padding:15px var(--gutter)}.article-figure img{height:280px}.article-content{padding:40px var(--gutter) 0}.short-answer p{font-size:20px;line-height:1.65}.short-answer{margin-bottom:35px}.entry-content{font-size:16px;line-height:1.8}.entry-content h2{font-size:29px;margin-top:38px}.fact{gap:15px;margin:35px 0;padding:25px 0}.fact>span{font-size:55px}.related-grid{display:grid;grid-template-columns:1fr;gap:30px}.related-grid .question{display:grid;grid-template-columns:110px 1fr;gap:0 18px}.related-grid .question-picture{grid-row:1/4;margin:0;border:0}.related-grid .question-picture img{height:130px}.related-grid .question-meta{align-self:end}.related-grid .question-arrow{grid-column:2;margin-top:8px}.related-grid .question h3{margin-top:8px}.related .section-rule{align-items:start}.empty-state h3{font-size:30px}}
@media(max-width:380px){.hero h1{font-size:18.5vw;top:36%}.hero{min-height:765px}.hero-search{bottom:72px}.hero-search>p{font-size:12px}.section-heading>p{max-width:105px;font-size:10px}.section-heading h2{font-size:46px}.daily-copy h3{font-size:39px}.scrub-word{font-size:39px}.video-dark .scrub-word{font-size:42px}.index-intro{padding-right:85px}.index-intro h2{font-size:30px}.index-intro>img{width:100px}.strange-heading h2{font-size:37px}.surprise{gap:15px}.surprise>span{width:60px;font-size:135px}.surprise h2{font-size:34px}.article-heading h1{font-size:39px}}
@media(max-width:767px){.title-word+.title-word{margin-left:0}.section-heading>p{display:none}.video-dark video,.video-dark .video-poster{object-fit:contain;object-position:center;width:140%;max-width:none;left:-20%;height:70%;top:8%}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}.video-instruction{display:none}.hero-scientist{transform:none}}


.hero-edition{justify-content:flex-end}.back-link{display:inline-flex;align-items:center;gap:8px}.back-link svg{transform:rotate(180deg);width:16px;height:16px}.back-top{display:inline-flex;align-items:center;gap:6px}.back-top svg{transform:rotate(-90deg);width:14px;height:14px}

/* Editorial polish: a direct archive route and a quiet, delayed invitation. */
.button-outline{background:transparent;color:var(--red);border-color:var(--red)}
.button-outline:hover{background:var(--red);color:var(--paper)}
.all-questions{flex-shrink:0;margin-bottom:8px}
.index-intro h2{margin-top:0}
.scientist-launcher[hidden]{display:none}
.scientist-launcher.is-inviting{animation:scientist-arrive .55s cubic-bezier(.16,1,.3,1) both}
@keyframes scientist-arrive{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:767px){.section-heading{flex-direction:column;align-items:flex-start;gap:24px}.all-questions{margin-bottom:0}.footer-bottom{font-size:10px;line-height:1.6}}
@media(prefers-reduced-motion:reduce){.scientist-launcher.is-inviting{animation:none}}

/* Native categories may grow without stretching the desktop header. */
.category-index a>span{min-width:0;overflow-wrap:anywhere}
.category-index small{flex-shrink:0}
.pt-menu-more{position:relative}
.more-toggle{display:flex;align-items:center;gap:8px;padding:12px 0;font-size:12px}
.more-toggle:hover,.more-toggle[aria-expanded=true]{color:var(--red)}
.primary-nav .pt-menu-more>.sub-menu{display:none;position:absolute;right:0;top:100%;min-width:210px;max-width:min(320px,90vw);max-height:65vh;overflow:auto;background:var(--paper);border:1px solid var(--line);padding:12px 20px;z-index:35}
.primary-nav .pt-menu-more.is-open>.sub-menu{display:block}
.primary-nav .pt-menu-more>.sub-menu a{overflow-wrap:anywhere;white-space:normal}
.ad-slot{padding:28px var(--gutter);max-width:1200px;margin:0 auto;clear:both}
.ad-label{display:block;font-size:10px;color:var(--muted);margin-bottom:8px}
.ad-content{min-width:0;min-height:120px;overflow:hidden;overflow:clip;contain:inline-size}
.ad-widget{max-width:100%;overflow-wrap:anywhere}
.ad-widget img,.ad-widget iframe,.ad-widget video{max-width:100%}
.ad-widget img{height:auto;margin-inline:auto}
.ad-widget figure{margin:0}
.ad-slot-article{max-width:860px}
@media(max-width:1200px){.more-toggle{font-size:11px}}
@media(max-width:1050px){.primary-nav .pt-menu-more{grid-column:1/-1}.primary-nav .more-toggle{display:none}.primary-nav .pt-menu-more>.sub-menu,.primary-nav .pt-menu-more.is-open>.sub-menu{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px 25px;position:static;min-width:0;max-width:none;max-height:none;border:0;padding:0;overflow:visible}.primary-nav li{min-width:0}.primary-nav a{overflow-wrap:anywhere}}
@media(max-width:767px){.primary-nav .pt-menu-more>.sub-menu,.primary-nav .pt-menu-more.is-open>.sub-menu{grid-template-columns:repeat(2,minmax(0,1fr))}.ad-slot{padding-block:22px}.ad-content{min-height:100px}}

/* Lightweight copying deterrent; forms and article text keep native behavior. */
img,video{-webkit-user-select:none;user-select:none;-webkit-user-drag:none;-webkit-touch-callout:none}
.home #main,.home .site-header,.home .site-footer{-webkit-user-select:none;user-select:none}
.home input,.home textarea,.home [contenteditable=true]{-webkit-user-select:text;user-select:text}
.video-instruction{top:32px}
@media(max-width:767px){.video-instruction{top:25px}}