@charset "utf-8";
:root{--paper:#f9f9f6;--white:#fff;--ink:#1f2b29;--secondary:#576864;--quiet:#778783;--accent:#365c51;--accent2:#708f7f;--wash:#edf2ef;--line:#dbe2dc;--sand:#f2efe9;--serif:'Hiragino Mincho ProN','Yu Mincho','Noto Serif JP',serif;--sans:'Hiragino Kaku Gothic ProN','Hiragino Sans','Yu Gothic','Meiryo',sans-serif}
*,*:before,*:after{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:100px}body{margin:0;background:var(--paper);font:15px/1.95 var(--sans);color:var(--ink);-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}a:hover{color:var(--accent)}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid #5f9781;outline-offset:3px}button,input{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed}p,h1,h2,h3,h4{margin:0}ul,ol{margin:0;padding:0}.container{width:min(1220px,calc(100% - 80px));margin-inline:auto}.reading{width:min(750px,100%);margin-inline:auto}.subtle{color:var(--quiet)}.muted{color:var(--secondary)}.kicker{font-size:10px;text-transform:uppercase;letter-spacing:.24em;color:var(--accent);font-weight:700}.section{padding:96px 0}.section.alt{background:#f0f3ef;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.section-head{display:flex;align-items:end;justify-content:space-between;gap:30px;margin-bottom:34px}.section-title{font:500 clamp(28px,3.3vw,42px)/1.5 var(--serif);letter-spacing:-.05em;margin-top:11px}.section-desc{color:var(--secondary);max-width:660px;margin-top:12px;font-size:14px}.line-link{font-size:12px;font-weight:750;color:var(--accent);white-space:nowrap;border-bottom:1px solid #b2c6ba;padding-bottom:4px}.line-link:hover{border-color:var(--accent)}.number{font:italic 20px var(--serif);color:#8da59a}.pill{display:inline-block;border:1px solid #cbdad0;color:var(--accent);font-size:10px;font-weight:750;padding:2px 10px;border-radius:20px;background:#f4f8f4}.pill.sand{border-color:#e3d6c3;background:#fbf7f0;color:#8b7355}.button{display:inline-flex;align-items:center;justify-content:center;gap:20px;border:1px solid var(--accent);background:var(--accent);color:#fff;padding:14px 22px;min-height:48px;font-size:12px;letter-spacing:.02em;font-weight:750;transition:.16s}.button:hover{background:#263f37;color:#fff;transform:translateY(-1px)}.button.ghost{color:var(--accent);background:transparent}.button.ghost:hover{background:var(--wash)}.serif{font-family:var(--serif)}
.top-rule{height:3px;background:linear-gradient(90deg,#436b5b 0 70%,#9ab1a1 70% 89%,#d4c8b1 89% 100%)}.site-header{position:sticky;top:0;z-index:50;background:rgba(249,249,246,.96);backdrop-filter:blur(15px);border-bottom:1px solid var(--line)}.header-row{display:flex;align-items:center;min-height:76px;gap:36px}.logo{display:flex;align-items:center;gap:13px;flex-shrink:0}.logo-mark{display:grid;place-items:center;border:1px solid #7f9c8c;width:33px;height:33px;border-radius:50%;font:italic 23px/1 Georgia,serif;color:var(--accent)}.logo-text{font:500 23px/1.05 var(--serif);letter-spacing:-.08em;white-space:nowrap}.logo-en{display:block;margin-top:7px;font:8px/1.1 Georgia,serif;letter-spacing:.18em;color:var(--quiet)}.nav{margin-left:auto;display:flex;align-items:center;gap:27px}.nav a{font-size:11px;letter-spacing:.02em;color:#40514a;font-weight:750}.nav a:hover,.nav a[aria-current="page"]{color:var(--accent);text-decoration:underline;text-underline-offset:7px}.nav-search{border:1px solid #c5d4ca;padding:8px 12px}.nav-button{display:none;margin-left:auto;border:1px solid var(--line);color:var(--ink);background:var(--white);font-size:12px;padding:7px 13px}.search-icon{font-size:16px;line-height:1}
.hero{background:linear-gradient(120deg,#fafaf7 54%,#f0f3ee);border-bottom:1px solid var(--line);overflow:hidden}.hero-inner{display:grid;grid-template-columns:1.05fr .95fr;min-height:614px;gap:40px;align-items:center;padding-top:72px;padding-bottom:80px}.hero h1{font:500 clamp(43px,4.5vw,72px)/1.43 var(--serif);letter-spacing:-.09em;margin:23px 0 29px}.hero h1 em{font-style:normal;color:var(--accent)}.hero-lead{font-size:15px;max-width:550px;color:#44564e;line-height:2.3}.hero-actions{margin-top:30px;display:flex;gap:12px;flex-wrap:wrap}.hero-meta{margin-top:43px;border-top:1px solid var(--line);padding-top:14px;font-size:11px;color:var(--quiet);max-width:490px;line-height:1.85}.plate{position:relative;padding:33px 30px 29px;border:1px solid #e1e7e1;box-shadow:0 30px 80px rgba(41,63,53,.055);background:#fff;min-width:0}.plate-top{display:flex;justify-content:space-between;align-items:start;gap:18px}.plate-title{font:500 18px/1.5 var(--serif);letter-spacing:-.025em}.plate-kicker{font:10px Georgia,serif;letter-spacing:.09em;color:var(--accent2)}.plate-fig{display:flex;justify-content:center;align-items:center;min-height:230px;background:radial-gradient(ellipse at 50% 50%,#f8faf8,#fff 72%);margin-top:17px}.plate-fig svg{width:100%;max-width:410px;height:auto}.plate-notes{border-top:1px solid var(--line);display:grid;grid-template-columns:1fr 1fr;gap:18px;padding-top:17px}.plate-notes b{font:500 31px Georgia,serif}.plate-notes span{display:block;font-size:10px;color:var(--secondary);margin-top:1px}.plate-foot{margin-top:18px;color:var(--quiet);font-size:10px;line-height:1.85}
.questions-bar{border-bottom:1px solid var(--line);background:#fff}.questions-row{display:flex;gap:12px;align-items:center;padding:15px 0;overflow:auto;scrollbar-width:thin}.questions-label{font:italic 15px Georgia,serif;color:var(--accent);padding-right:15px;border-right:1px solid var(--line);flex:none}.questions-row a{font-size:11px;white-space:nowrap;padding:3px 12px;color:var(--secondary);border-right:1px solid #e9eee9}.questions-row a:last-child{border:0}.questions-row a:hover{text-decoration:underline;text-underline-offset:3px}
.category-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}.category-card{border:1px solid var(--line);background:#fff;padding:25px 21px;min-height:234px;display:flex;flex-direction:column;transition:transform .18s,box-shadow .18s}.category-card:hover{transform:translateY(-3px);box-shadow:0 16px 35px rgba(43,57,48,.07)}.category-card .number{font-size:31px;line-height:1}.category-card .en{font-size:9px;letter-spacing:.12em;color:var(--accent);font-weight:750;margin-top:27px}.category-card h3{font:500 19px/1.5 var(--serif);margin-top:7px}.category-card p{font-size:11px;line-height:1.85;color:var(--secondary);margin-top:10px}.category-card .arrow{margin-top:auto;color:var(--accent);font-size:17px;text-align:right}.category-card:last-child{background:#f8f5ef}
.featured-grid{display:grid;grid-template-columns:1.12fr .88fr;gap:22px}.lead-story{border:1px solid var(--line);background:#fff;min-height:480px;display:flex;flex-direction:column}.lead-visual{min-height:192px;padding:20px 33px;background:linear-gradient(120deg,#e6ede8,#f5f7f4);position:relative;overflow:hidden}.lead-visual .shape{position:absolute;right:-4%;top:0;width:55%;height:230px;opacity:.28}.lead-visual .over{position:relative;z-index:2}.lead-story .body{padding:31px 35px 28px;display:flex;flex:1;flex-direction:column}.lead-story h3{font:500 clamp(26px,2.8vw,37px)/1.5 var(--serif);letter-spacing:-.04em;margin-top:14px}.lead-story p{font-size:13px;color:var(--secondary);line-height:2;margin-top:11px}.lead-story .end{margin-top:auto;padding-top:24px}.story-list{display:flex;flex-direction:column;border-top:1px solid var(--line)}.story-link{display:grid;grid-template-columns:67px 1fr 24px;gap:15px;align-items:center;padding:25px 6px;border-bottom:1px solid var(--line)}.story-num{font:italic 28px Georgia,serif;color:#a3b5a9}.story-link .meta{font-size:10px;color:var(--accent);letter-spacing:.04em}.story-link h3{font:500 20px/1.65 var(--serif);margin-top:7px;letter-spacing:-.035em}.story-link p{font-size:11px;color:var(--secondary);margin-top:3px}.story-link .arr{font-size:20px;color:var(--accent)}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:38px;align-items:stretch}.research-callout{padding:38px;border:1px solid #d8e1d8;background:#fff}.research-callout h3{font:500 28px/1.55 var(--serif);margin:12px 0 17px}.research-callout>p{font-size:13px;color:var(--secondary);line-height:2.1}.stat-line{display:flex;align-items:baseline;gap:18px;border-top:1px solid var(--line);margin-top:34px;padding-top:22px}.stat-line strong{font:500 53px/1.1 Georgia,serif;color:var(--accent)}.stat-line span{font-size:11px;color:var(--quiet);line-height:1.6}.research-entries{border-top:1px solid #cfdcd1}.research-entries a{display:block;padding:18px 8px;border-bottom:1px solid #cfdcd1}.research-entries small{display:block;font-size:10px;color:var(--accent);letter-spacing:.06em}.research-entries b{display:block;font:500 19px/1.7 var(--serif);margin-top:6px}.research-entries em{font-style:normal;font-size:11px;color:var(--secondary)}
.kids-band{background:var(--sand)}.kids-banner{display:grid;grid-template-columns:.48fr .52fr;gap:55px;align-items:center}.kids-illustration{aspect-ratio:1.11;background:#eeebe4;display:grid;place-items:center;padding:30px;overflow:hidden}.kids-illustration svg{width:90%;height:90%;max-width:330px}.kids-content h2{font:500 clamp(29px,3.6vw,44px)/1.5 var(--serif);letter-spacing:-.05em;margin:16px 0}.kids-content>p{font-size:13px;line-height:2.1;color:var(--secondary);max-width:570px}.kids-links{margin:23px 0 27px;border-top:1px solid #dedcd4}.kids-links a{display:flex;justify-content:space-between;gap:10px;padding:10px 3px;border-bottom:1px solid #dedcd4;font-size:13px}
.think-band{background:#253f35;color:#fff}.think-inner{display:grid;grid-template-columns:.8fr 1.2fr;gap:76px;align-items:center}.think-band .kicker{color:#bad3c5}.think-inner h2{font:500 clamp(32px,3.4vw,47px)/1.5 var(--serif);margin-top:14px}.think-inner p{font-size:13px;line-height:2.1;color:#c6d7ce;margin:15px 0 28px}.think-board{padding:34px;border:1px solid #7c9d8e;background:#f8faf7;color:var(--ink)}.think-board .meta{font-size:10px;color:var(--accent);letter-spacing:.13em}.think-board h3{font:500 20px/1.6 var(--serif);margin-top:14px}.think-board .equation{font:500 31px/1.5 Georgia,serif;text-align:center;letter-spacing:.12em;padding:34px 0}.think-board .choices{display:grid;grid-template-columns:repeat(4,1fr);gap:8px}.think-board button{border:1px solid #cad8ce;background:#fff;padding:12px 7px;color:var(--ink);font-size:14px}.think-board button:hover,.think-board button.selected{border-color:#547967;background:#e4ede7}.quiz-result{min-height:48px;font-size:12px;color:var(--accent);padding-top:15px;line-height:1.85}.think-band .button.ghost{border-color:#b7cebd;color:#fff}.think-band .button.ghost:hover{background:#345447}
.editorial-strip{background:#fff;border-top:1px solid var(--line)}.editorial-row{display:grid;grid-template-columns:1fr 1fr;gap:50px;padding:43px 0}.editorial-row h2{font:500 25px/1.55 var(--serif);margin-top:10px}.editorial-row p{font-size:12px;color:var(--secondary);line-height:2.1}.footer{padding:46px 0 22px;border-top:1px solid var(--line);background:#f4f6f2}.footer-top{display:flex;gap:55px;justify-content:space-between;align-items:flex-start}.footer-logo{font:500 25px var(--serif);letter-spacing:-.06em}.footer-note{font-size:11px;color:var(--quiet);line-height:1.9;margin-top:12px;max-width:490px}.footer-links{display:flex;gap:14px 22px;flex-wrap:wrap;max-width:460px}.footer-links a{font-size:11px;color:var(--secondary)}.footer-bottom{font-size:10px;color:var(--quiet);border-top:1px solid var(--line);padding-top:21px;margin-top:37px;display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap}
/* index, article & category */
.page-hero{padding:65px 0 55px;border-bottom:1px solid var(--line);background:linear-gradient(110deg,#fafbf8,#f0f3ee)}.breadcrumb{font-size:11px;color:var(--quiet);display:flex;gap:11px;align-items:center;flex-wrap:wrap}.breadcrumb a:hover{text-decoration:underline}.page-hero .kicker{margin-top:37px}.page-hero h1{font:500 clamp(38px,5.2vw,65px)/1.4 var(--serif);letter-spacing:-.07em;margin-top:14px}.page-hero .deck{font-size:15px;color:var(--secondary);max-width:770px;margin-top:17px;line-height:2.2}.page-meta{display:flex;gap:12px 22px;flex-wrap:wrap;color:var(--quiet);font-size:11px;margin-top:25px}.archive-section{padding:62px 0 100px}.archive-intro{font-size:13px;color:var(--secondary);margin-bottom:27px}.filter-row{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:23px}.filter-row button{font-size:11px;padding:9px 14px;border:1px solid #cbdad0;background:#fff;color:var(--secondary)}.filter-row button.active{background:var(--accent);color:#fff;border-color:var(--accent)}.archive-list{border-top:1px solid var(--line)}.archive-item{display:grid;grid-template-columns:105px 1fr 35px;gap:22px;padding:27px 0;border-bottom:1px solid var(--line);align-items:start}.archive-item .tag{font-size:11px;color:var(--accent);padding-top:8px}.archive-item h2{font:500 clamp(22px,2.3vw,29px)/1.55 var(--serif);letter-spacing:-.035em}.archive-item p{font-size:13px;color:var(--secondary);margin-top:6px}.archive-item .arrow{font-size:22px;color:var(--accent)}.archive-item:hover h2{text-decoration:underline;text-decoration-color:#b9cbbf;text-underline-offset:5px}.archive-empty{display:none;padding:40px 0;font-size:13px;color:var(--secondary)}.search-form{display:flex;gap:9px;max-width:720px}.search-form input{flex:1;width:100%;padding:13px 18px;background:#fff;border:1px solid #c9d9cd;border-radius:0;font-size:14px}.search-count{font-size:12px;color:var(--quiet);margin-bottom:14px}
.article-layout{display:grid;grid-template-columns:minmax(0,760px) 1fr;gap:75px;align-items:start;padding-top:70px;padding-bottom:120px}.article-main{min-width:0}.article-lead{font:500 21px/2 var(--serif);letter-spacing:-.02em;margin-bottom:33px}.takeaway{padding:25px 29px;background:#f0f4ef;border-left:2px solid var(--accent2);margin:24px 0 37px}.takeaway h2{font-size:11px;letter-spacing:.11em;color:var(--accent);margin-bottom:10px}.takeaway ul{padding-left:22px;font-size:13px;line-height:2.15}.prose{font-size:15px;line-height:2.35;color:#34423d}.prose h2{font:500 27px/1.55 var(--serif);color:var(--ink);letter-spacing:-.04em;margin:60px 0 19px;padding-top:20px;border-top:1px solid var(--line)}.prose h2:first-child{margin-top:0}.prose p{margin:0 0 25px}.prose strong{font-weight:750;color:#263d34}.prose a{color:var(--accent);text-decoration:underline;text-underline-offset:4px}.sources{border-top:1px solid var(--line);margin-top:62px;padding-top:26px}.sources h2{font:500 23px var(--serif);margin-bottom:10px}.sources p{font-size:12px;color:var(--secondary)}.sources ol{margin:14px 0 0 21px;list-style:decimal}.sources li{font-size:12px;color:var(--secondary);padding:5px 0;overflow-wrap:anywhere}.sources a{color:var(--accent);text-decoration:underline;text-underline-offset:4px}.editor-note{border-top:1px solid var(--line);margin-top:27px;padding-top:19px;font-size:11px;color:var(--quiet);line-height:2}.article-sidebar{position:sticky;top:111px}.sidebar-box{border:1px solid var(--line);background:#fff;padding:23px 23px 26px;margin-bottom:22px}.sidebar-box h3{font:500 18px var(--serif);margin:10px 0 14px}.sidebar-box a{display:block;padding:11px 0;border-top:1px solid var(--line);font-size:12px;color:var(--secondary);line-height:1.75}.sidebar-box a:hover{color:var(--accent)}.related-links{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.related-item{border:1px solid var(--line);background:#fff;padding:25px}.related-item small{font-size:10px;color:var(--accent)}.related-item h3{font:500 19px/1.65 var(--serif);margin:13px 0}.related-item p{font-size:12px;color:var(--secondary)}
/* Interactive library */
.viz-panel{border:1px solid var(--line);background:#fff;padding:28px;margin-bottom:27px}.viz-grid{display:grid;grid-template-columns:.65fr .35fr;gap:30px;align-items:center}.viz-panel h2{font:500 24px var(--serif);margin-bottom:8px}.viz-panel p{font-size:12px;color:var(--secondary);line-height:1.9}.plot{width:100%;height:auto;display:block}.iq-control label{font-size:11px;color:var(--secondary)}.iq-control strong{font:500 46px Georgia,serif;display:block;color:var(--accent);margin:8px 0}.iq-control input{width:100%;accent-color:var(--accent)}.iq-calc{margin-top:11px;font-size:12px;color:var(--secondary)}.iq-calc b{font:500 22px Georgia,serif;color:var(--accent)}.iq-disclaimer{font-size:11px;color:var(--quiet);margin-top:19px;padding-top:16px;border-top:1px solid var(--line)}
/* quiz */
.lab-grid{display:grid;grid-template-columns:.4fr .6fr;gap:32px}.lab-notes{border-top:1px solid var(--line);padding-top:19px;font-size:12px;color:var(--secondary)}.quiz-card{border:1px solid var(--line);background:#fff;padding:33px 35px}.quiz-count{font-size:10px;letter-spacing:.13em;color:var(--accent)}.quiz-card h2{font:500 25px/1.55 var(--serif);margin-top:15px}.quiz-sequence{text-align:center;border:1px solid #dfe8df;background:#f6f8f5;margin:25px 0 20px;padding:32px 10px;font:500 29px Georgia,var(--serif);letter-spacing:.09em}.quiz-options{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.quiz-options button{background:#fff;border:1px solid #cbd9cf;min-height:52px;color:var(--ink)}.quiz-options button:hover,.quiz-options button.selected{background:#e7f1e9;border-color:var(--accent)}.quiz-answer{font-size:13px;margin-top:17px;min-height:57px;color:var(--accent);line-height:2}.quiz-footer{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-top:25px}.quiz-footer button{font-size:12px;color:var(--accent);border:1px solid #b6cbbb;padding:10px 15px;background:#fff}.quiz-footer p{font-size:11px;color:var(--quiet)}
.faq-list{max-width:850px}.faq-list details{border-bottom:1px solid var(--line);padding:18px 0}.faq-list summary{cursor:pointer;font:500 17px/1.7 var(--serif)}.faq-list p{font-size:13px;color:var(--secondary);padding:17px 0 5px}.about-copy{font-size:14px;color:var(--secondary);line-height:2.25}.about-copy h2{font:500 27px var(--serif);color:var(--ink);margin:42px 0 15px}.about-copy p{margin:0 0 22px}.about-copy ul{padding-left:25px}
@media(max-width:1090px){.container{width:min(100% - 48px,1220px)}.nav{gap:13px}.nav a{font-size:10px}.logo-text{font-size:20px}.category-grid{grid-template-columns:repeat(3,1fr)}.category-card{min-height:200px}.hero-inner{gap:25px}.article-layout{gap:35px}}
@media(max-width:800px){.header-row{min-height:67px}.nav-button{display:block}.nav{display:none;position:absolute;top:67px;left:0;right:0;flex-direction:column;align-items:stretch;gap:0;background:var(--paper);border-bottom:1px solid var(--line);padding:10px 24px 19px;box-shadow:0 18px 24px rgba(0,0,0,.07)}.nav.open{display:flex}.nav a{padding:11px 7px;border-bottom:1px solid var(--line);font-size:13px}.nav a:last-child{border:0}.hero-inner{grid-template-columns:1fr;min-height:auto;padding:59px 0 65px}.hero h1{font-size:clamp(43px,8vw,65px)}.hero .plate{max-width:600px}.featured-grid,.kids-banner,.think-inner,.two-col,.editorial-row,.article-layout,.lab-grid{grid-template-columns:1fr}.kids-illustration{max-height:330px}.think-inner{gap:28px}.article-sidebar{position:static}.article-sidebar .sidebar-box:first-child{display:none}.section{padding:69px 0}.section-head{align-items:start;flex-direction:column;gap:12px}.featured-grid{gap:16px}.story-link{padding:18px 0}.related-links{grid-template-columns:1fr}.footer-top{flex-direction:column;gap:25px}}
@media(max-width:530px){body{font-size:14px}.container{width:calc(100% - 34px)}.logo-text{font-size:19px}.logo-mark{width:30px;height:30px;font-size:20px}.hero-inner{padding-top:40px}.hero h1{font-size:43px;line-height:1.5;margin-top:17px;margin-bottom:18px}.hero-lead{font-size:13px}.hero-actions{flex-direction:column;align-items:stretch}.hero-actions .button{justify-content:space-between}.hero-meta{margin-top:27px}.plate{padding:19px}.plate-title{font-size:15px}.plate-fig{min-height:185px}.plate-notes b{font-size:25px}.section{padding:57px 0}.section-title{font-size:29px}.category-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.category-card{padding:18px 15px;min-height:210px}.category-card:last-child{grid-column:span 2;min-height:172px}.category-card .number{font-size:27px}.category-card .en{font-size:8px;margin-top:20px}.category-card h3{font-size:18px}.category-card p{font-size:10px}.lead-story .body{padding:23px}.lead-story h3{font-size:26px}.story-link{grid-template-columns:43px 1fr 17px;gap:10px}.story-link h3{font-size:18px}.story-num{font-size:21px}.research-callout{padding:25px}.kids-banner{gap:28px}.kids-illustration{aspect-ratio:1.5}.think-board{padding:20px}.think-board .equation{font-size:25px}.think-board .choices{grid-template-columns:repeat(2,1fr)}.page-hero{padding:32px 0 40px}.page-hero h1{font-size:35px}.page-hero .deck{font-size:13px}.archive-section{padding:44px 0 80px}.archive-item{grid-template-columns:1fr 19px;gap:12px}.archive-item .tag{grid-column:1 / -1;padding:0}.archive-item h2{font-size:23px}.article-layout{padding-top:41px;padding-bottom:78px}.article-lead{font-size:18px}.takeaway{padding:21px}.prose{font-size:14px}.prose h2{font-size:24px;margin-top:48px}.viz-panel{padding:18px}.viz-grid{grid-template-columns:1fr;gap:10px}.iq-control strong{font-size:36px}.quiz-card{padding:20px}.quiz-card h2{font-size:21px}.quiz-sequence{font-size:24px;padding:25px 6px}.quiz-footer{align-items:start;flex-direction:column}.search-form{flex-direction:column}.footer-links{flex-direction:column}.reading{width:100%}}
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