@font-face {
  font-family: 'Montserrat';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(/assets/font0.ttf) format('truetype');
}
@font-face {
  font-family: 'Montserrat';
  font-style: normal;
  font-weight: 500;
  font-display: swap;
  src: url(/assets/font1.ttf) format('truetype');
}
@font-face {
  font-family: 'Montserrat';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(/assets/font2.ttf) format('truetype');
}
@font-face {
  font-family: 'Montserrat';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url(/assets/font3.ttf) format('truetype');
}
@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url(/assets/font4.ttf) format('truetype');
}
@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 600;
  font-display: swap;
  src: url(/assets/font5.ttf) format('truetype');
}
@font-face {
  font-family: 'Source Serif 4';
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url(/assets/font6.ttf) format('truetype');
}

:root{--navy:#0B2D5B;--blue:#1EA1E6;--sky:#8AD2F5;--orange:#FF9D00;--mist:#F4F8FB;--slate:#52647B;--line:#D7E1EA;--link:#075D91;--serif:'Source Serif 4',Georgia,serif;--body:'Montserrat',Arial,sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:120px}body{margin:0;background:#fff;color:var(--navy);font:16px/1.7 var(--body)}a{color:var(--link);text-underline-offset:5px}button,input{font:inherit}button{cursor:pointer}img{display:block;max-width:100%}h1,h2,h3{font-family:var(--serif);line-height:1.08;letter-spacing:-.035em;font-weight:600;margin:0 0 24px}h1{font-size:clamp(3rem,5.25vw,4.8rem)}h2{font-size:clamp(2.2rem,3vw,3rem)}h3{font-size:1.8rem}p{margin:0 0 22px}button,a,input,summary{-webkit-tap-highlight-color:transparent}:focus-visible{outline:3px solid var(--blue);outline-offset:5px}::selection{background:var(--sky);color:var(--navy)}.container{width:min(1200px,calc(100% - 64px));margin-inline:auto}.skip{position:fixed;left:20px;top:-100px;padding:12px 20px;background:white;z-index:99}.skip:focus{top:14px}.header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.98);border-bottom:1px solid var(--line)}.header-inner{height:104px;display:flex;align-items:center;justify-content:space-between;gap:24px}.brand{flex-shrink:0;padding:12px 0}.brand img{width:188px;height:auto}.nav{display:flex;gap:30px;align-items:center}.nav a{color:var(--navy);font-size:14px;font-weight:600;text-decoration:none;display:inline-flex;align-items:center;min-height:44px}.nav a:hover,.footer a:hover{text-decoration:underline}.nav .btn{margin-left:8px}.btn{display:inline-flex;gap:14px;align-items:center;justify-content:center;min-height:50px;padding:11px 24px;border:2px solid var(--navy);border-radius:8px;background:white;color:var(--navy);font-size:14px;font-weight:700;text-decoration:none;line-height:1.5;transition:background .16s}.btn:hover{background:var(--mist);text-decoration:none!important}.btn.orange{background:var(--orange)}.btn.orange:hover{background:#f08f00}.btn.navy{background:var(--navy);color:white}.btn.navy:hover{background:#174373}.arrow{font-family:Arial,sans-serif;font-size:21px;font-weight:400}.mobile-menu{display:none;position:relative}.mobile-menu summary{cursor:pointer;list-style:none;min-height:48px;display:flex;align-items:center;padding:8px 16px;border:1px solid var(--line);border-radius:8px;font-weight:600;font-size:14px}.mobile-menu summary::-webkit-details-marker{display:none}.mobile-panel{position:absolute;right:0;top:60px;background:#fff;box-shadow:0 12px 36px #0b2d5b22;padding:20px;width:min(340px,calc(100vw - 40px));border:1px solid var(--line);border-radius:16px;display:grid;gap:4px}.mobile-panel>a{padding:10px 8px;min-height:44px;text-decoration:none;color:var(--navy)}.mobile-panel .btn{margin-top:12px}.eyebrow{text-transform:uppercase;letter-spacing:.16em;font-size:12px;font-weight:700;color:var(--link);margin-bottom:20px}.hero{padding:54px 0 0;background:linear-gradient(180deg,#f4f8fb 0%,#fff 100%)}.hero-grid{display:grid;grid-template-columns:1fr 1.07fr;gap:62px;align-items:center}.hero-copy{padding:28px 0}.hero-copy h1{max-width:520px}.hero-copy h1 em{font-weight:400;font-style:italic;color:var(--link)}.hero-copy .lead{font-size:17px;color:var(--slate);line-height:1.8;max-width:470px}.hero-copy .btn{margin-top:12px}.hero-photo{position:relative;aspect-ratio:1.06;border-radius:16px;overflow:hidden;background:var(--sky)}.hero-photo img{width:100%;height:100%;object-fit:cover}.image-label{position:absolute;left:24px;bottom:24px;right:24px;color:#fff;display:flex;gap:12px;align-items:center;z-index:1;font-size:13px}.hero-photo:after{content:'';position:absolute;bottom:0;left:0;right:0;height:40%;background:linear-gradient(transparent,#001c36a6);pointer-events:none}.image-label svg{width:18px;height:18px;flex:none}.hero-meta{display:flex;gap:20px;align-items:center;font-size:13px;color:var(--slate);margin-top:25px}.hero-meta:before{content:'';width:28px;height:1px;background:var(--line)}.intro-strip{margin-top:48px;padding:22px 0;border-block:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:22px}.intro-strip p{margin:0;font-size:14px;color:var(--slate)}.intro-strip a{font-size:14px;font-weight:600;text-decoration:none;display:inline-flex;gap:12px;align-items:center;min-height:44px}.section{padding:80px 0}.section-head{display:flex;justify-content:space-between;gap:30px;align-items:end;margin-bottom:32px}.section-head h2{margin:0}.section-head p{color:var(--slate);margin:12px 0 0;max-width:550px}.small-number{font-family:var(--serif);font-size:20px;color:var(--slate);margin-bottom:5px}.browse-bar{display:flex;flex-wrap:wrap;gap:20px;align-items:end;justify-content:space-between;margin:32px 0 24px}.filters{display:flex;gap:8px;flex-wrap:wrap}.chip{border:1px solid var(--line);background:white;padding:10px 18px;border-radius:99px;min-height:44px;color:var(--navy);font-size:14px;font-weight:600}.chip[aria-pressed=true]{background:var(--navy);border-color:var(--navy);color:#fff}.search-field{display:flex;align-items:center;gap:12px}.search-field label{font-size:14px;color:var(--slate)}.search-field input{width:230px;min-height:46px;border:1px solid #6B7E93;border-radius:8px;padding:10px 14px;color:var(--navy);font-size:14px;background:#fff}.search-field input::placeholder{color:var(--slate)}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px}.card{border:1px solid var(--line);border-radius:16px;overflow:hidden;background:#fff;display:flex;flex-direction:column;transition:transform .16s,box-shadow .16s}.card:hover{transform:translateY(-3px);box-shadow:0 12px 28px #0b2d5b0b}.card[hidden]{display:none}.card-image{display:block;aspect-ratio:1.65;overflow:hidden}.card-image img{width:100%;height:100%;object-fit:cover;transition:transform .3s}.card:hover .card-image img{transform:scale(1.035)}.card-body{padding:26px 25px 20px;flex:1}.card .eyebrow{font-size:11px;margin-bottom:14px}.card h3{font-size:27px;line-height:1.16;margin-bottom:16px}.card h3 a{color:var(--navy);text-decoration:none}.card h3 a:hover{text-decoration:underline}.card p{font-size:14px;line-height:1.8;color:var(--slate);margin-bottom:0}.card-foot{margin:0 25px;padding:18px 0;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;font-size:12px;color:var(--slate)}.card-foot a{font-weight:600;display:inline-flex;align-items:center;gap:10px;text-decoration:none;font-size:14px;min-height:28px}.status{font-size:13px;color:var(--slate);margin-top:20px}.empty{border:1px solid var(--line);border-radius:16px;background:var(--mist);padding:36px}.empty[hidden]{display:none}.empty h3{font-size:26px}.empty p{color:var(--slate)}.editorial{display:grid;grid-template-columns:1.1fr 1fr;gap:70px;align-items:center;background:var(--mist);border-radius:16px;overflow:hidden}.editorial-photo{height:490px;width:100%;object-fit:cover}.editorial-copy{padding:40px 50px 40px 0}.editorial-copy p{color:var(--slate)}.text-link{font-size:14px;font-weight:600;display:inline-flex;align-items:center;gap:12px;min-height:44px}.tour-banner{margin-top:72px;border-radius:16px;background:var(--navy);padding:44px 48px;display:flex;align-items:center;gap:48px;justify-content:space-between;color:white}.tour-banner h2{font-size:36px;margin-bottom:16px}.tour-banner p{max-width:630px;color:#dbe8f4;margin-bottom:12px;font-size:15px}.tour-banner .eyebrow{color:var(--sky)}.tour-banner .btn{flex-shrink:0}.tour-banner small{display:block;color:#dbe8f4;font-size:12px;line-height:1.8;max-width:620px}.about{display:grid;grid-template-columns:.8fr 1.2fr;gap:80px;border-top:1px solid var(--line);padding-top:64px}.about p{color:var(--slate);font-size:17px}.about h2{font-size:38px}.footer{background:var(--navy);color:#fff;padding:54px 0 24px}.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:60px}.footer-brand{display:flex;align-items:center;gap:18px;margin-bottom:18px}.footer-brand img{width:55px;height:55px}.footer-brand strong{font-family:var(--serif);font-size:26px;letter-spacing:-.02em}.footer p{color:#dbe8f4;max-width:360px;font-size:14px}.footer h2{font-family:var(--body);font-size:12px;font-weight:700;letter-spacing:.15em;text-transform:uppercase;margin:8px 0 20px}.footer nav{display:grid;gap:6px}.footer a{color:#fff;text-decoration:none;font-size:14px;min-height:36px;display:inline-flex;align-items:center}.footer-bottom{border-top:1px solid #446183;margin-top:42px;padding-top:22px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:16px;font-size:12px;color:#dbe8f4}.footer-bottom a{font-size:12px;min-height:24px}.breadcrumbs{display:flex;gap:12px;flex-wrap:wrap;font-size:12px;color:var(--slate);margin-bottom:38px}.breadcrumbs a{color:var(--slate)}.article-head{padding:45px 0 40px}.article-head h1{max-width:900px;font-size:clamp(2.7rem,4.5vw,4.2rem)}.article-head .lead{max-width:780px;color:var(--slate);font-size:19px;line-height:1.7}.byline{font-size:13px;display:flex;gap:18px;flex-wrap:wrap;color:var(--slate)}.wide-photo{height:480px;width:100%;object-fit:cover;border-radius:16px}.photo-caption{font-size:12px;color:var(--slate);margin-top:12px;line-height:1.7}.article-layout{display:grid;grid-template-columns:minmax(0,720px) 280px;gap:100px;align-items:start;padding:54px 0 80px}.article-body{font-size:17px;line-height:1.85;color:#34495f}.article-body h2{font-size:34px;line-height:1.16;color:var(--navy);margin-top:45px}.article-body h2:first-child{margin-top:0}.article-body h3{font-size:26px;line-height:1.25;color:var(--navy);margin-top:32px;margin-bottom:16px}.article-body ul,.article-body ol{padding-left:24px;margin-bottom:28px}.article-body li{padding-left:7px;margin-bottom:10px}.article-body a{font-weight:500}.article-body strong{color:var(--navy)}.article-body figure{margin:35px 0}.article-body figure img{border-radius:12px;width:100%;max-height:480px;object-fit:cover}.article-body blockquote,.note{margin:30px 0;padding:22px 26px;background:var(--mist);border-left:3px solid var(--blue);font-size:16px;border-radius:0 8px 8px 0}.note strong{display:block;margin-bottom:8px}.note p:last-child{margin:0}.toc{background:var(--mist);border:1px solid var(--line);border-radius:16px;padding:26px;position:sticky;top:132px}.toc h2{font-family:var(--body);font-size:14px;letter-spacing:0;font-weight:700;margin:0 0 17px}.toc a{display:block;font-size:14px;line-height:1.55;padding:9px 0;text-decoration:none}.toc a:hover{text-decoration:underline}.toc .side-note{border-top:1px solid var(--line);margin-top:20px;padding-top:22px;font-size:13px;color:var(--slate)}.toc .btn{display:flex;font-size:13px;margin-top:15px}.article-body .cta{padding:30px;background:var(--navy);color:white;border-radius:16px;margin-top:40px}.cta h3{color:white;margin-top:0}.cta p{font-size:15px}.cta small{font-size:12px;color:#dbe8f4;display:block;margin-top:15px}.sources{padding-top:30px;margin-top:40px;border-top:1px solid var(--line);font-size:14px;line-height:1.7}.sources h2{font-family:var(--body);font-size:16px;margin-top:0}.sources ol{padding-left:22px}.source-ref{font-size:12px;white-space:nowrap}.table-wrap{overflow-x:auto;margin-bottom:28px}table{border-collapse:collapse;width:100%;font-size:14px;line-height:1.6}th,td{text-align:left;padding:16px 14px;border-bottom:1px solid var(--line)}th{background:var(--mist);color:var(--navy)}.related{margin-top:50px;padding-top:30px;border-top:1px solid var(--line)}.related a{display:block;padding:10px 0}.faq details{border-bottom:1px solid var(--line);padding:12px 0}.faq summary{list-style:none;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:20px;min-height:50px;font-size:16px;font-weight:600;color:var(--navy)}.faq summary::-webkit-details-marker{display:none}.faq summary:after{content:'+';font-size:24px;flex:none}.faq details[open] summary:after{content:'×'}.faq p{margin-top:12px;font-size:16px}.tours-layout{display:grid;grid-template-columns:1.15fr 1fr;gap:72px;align-items:start}.operator{background:var(--mist);border:1px solid var(--line);border-radius:16px;padding:36px;position:sticky;top:132px}.operator h2{font-size:38px}.operator p{color:var(--slate)}.operator small{display:block;font-size:13px;line-height:1.7;margin-top:22px;color:var(--slate)}.steps{list-style:none;padding:0;counter-reset:steps}.steps li{counter-increment:steps;border-bottom:1px solid var(--line);padding:22px 0 22px 48px;position:relative}.steps li:before{content:counter(steps,decimal-leading-zero);position:absolute;left:0;top:23px;color:var(--link);font-family:var(--serif);font-size:22px}.steps h3{font-size:25px;margin-bottom:12px}.steps p{font-size:15px;color:var(--slate);margin:0}.reading-progress{position:fixed;top:104px;left:0;height:2px;background:var(--blue);width:0;z-index:21;pointer-events:none}.credits-grid{display:grid;gap:28px}.credit-row{display:grid;grid-template-columns:220px 1fr;gap:28px;border-bottom:1px solid var(--line);padding-bottom:28px}.credit-row img{height:150px;width:100%;object-fit:cover;border-radius:12px}.credit-row h2{font-size:27px;margin-bottom:14px}.credit-row p{font-size:14px;color:var(--slate)}
@media(min-width:1500px){.hero{padding-top:64px}.hero-photo{aspect-ratio:1.08}}@media(max-width:1050px){.nav{gap:18px}.nav a{font-size:13px}.hero-grid{gap:35px}.article-layout{gap:40px;grid-template-columns:minmax(0,1fr) 245px}.editorial{gap:35px}.editorial-copy{padding-right:28px}.cards{gap:18px}.card-body{padding:22px 20px}.card-foot{margin-inline:20px}}@media(max-width:850px){.nav{display:none}.mobile-menu{display:block}.header-inner{height:86px}.brand img{width:164px}.reading-progress{top:86px}.hero-grid{gap:26px}.hero-copy h1{font-size:3.15rem}.hero-photo{aspect-ratio:.8}.hero-copy .lead{font-size:16px}.intro-strip{margin-top:32px}.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.card:last-child{grid-column:auto}.search-field label{display:none}.section{padding:60px 0}.editorial{gap:24px}.editorial-photo{height:450px}.editorial-copy h2{font-size:34px}.article-layout{display:flex;flex-direction:column;gap:35px}.toc{position:static;order:-1;width:100%}.toc nav{display:grid;grid-template-columns:1fr 1fr;gap:0 20px}.toc .side-note{display:none}.article-body{max-width:720px}.tour-banner{padding:35px;gap:25px}.tour-banner h2{font-size:31px}.about{gap:40px}.footer-grid{gap:30px}.tours-layout{gap:35px}.operator{padding:28px}.wide-photo{height:380px}}
@media(max-width:600px){.container{width:calc(100% - 40px)}.header-inner{height:80px;gap:16px}.brand img{width:148px}.reading-progress{top:80px}.hero{padding-top:25px}.hero-grid{grid-template-columns:1fr;gap:22px}.hero-copy{padding:12px 0}.hero-copy h1{font-size:46px;max-width:430px;margin-bottom:22px}.hero-copy .lead{font-size:16px}.hero-copy .btn{margin-top:6px}.hero-meta{margin-top:20px}.hero-photo{aspect-ratio:1.3}.image-label{left:18px;bottom:18px;font-size:12px}.intro-strip{padding:15px 0;align-items:flex-start;flex-direction:column;gap:0;margin-top:26px}.intro-strip p{font-size:13px}.intro-strip a{font-size:13px}.section{padding:48px 0}.section-head{align-items:start}.section-head h2{font-size:34px}.section-head p{font-size:15px}.small-number{display:none}.browse-bar{gap:20px}.search-field{width:100%}.search-field input{width:100%}.search-field label{display:block;flex:none;font-size:13px}.chip{padding-inline:15px;font-size:13px}.cards{grid-template-columns:1fr;gap:24px}.card-body{padding:25px}.card h3{font-size:29px}.card-foot{margin-inline:25px}.card-image{aspect-ratio:1.65}.editorial{grid-template-columns:1fr;gap:0}.editorial-photo{height:300px}.editorial-copy{padding:32px 26px}.editorial-copy h2{font-size:34px}.tour-banner{margin-top:44px;display:block;padding:30px 26px}.tour-banner .btn{margin-top:24px}.tour-banner h2{font-size:33px}.about{grid-template-columns:1fr;gap:5px;padding-top:44px}.about h2{font-size:34px}.about p{font-size:16px}.footer-grid{grid-template-columns:1fr 1fr;gap:32px}.footer-grid>div:first-child{grid-column:1 / -1}.footer{padding-top:38px}.footer-bottom{margin-top:30px}.article-head{padding-top:28px}.breadcrumbs{font-size:11px;margin-bottom:25px;gap:9px}.article-head h1{font-size:41px}.article-head .lead{font-size:17px}.byline{font-size:12px;gap:6px 15px}.wide-photo{height:280px}.article-layout{padding-top:32px;padding-bottom:50px}.article-body{font-size:16px;line-height:1.85}.article-body h2{font-size:30px}.article-body h3{font-size:25px}.toc{padding:24px}.toc nav{display:block}.toc a{padding:7px 0}.note{padding:20px}.article-body .cta{padding:26px}.tours-layout{grid-template-columns:1fr;gap:36px}.operator{position:static;order:-1;padding:28px}.operator h2{font-size:34px}.credit-row{grid-template-columns:1fr;gap:20px}.credit-row img{height:210px}.table-wrap{margin-inline:-3px}th,td{padding:13px 10px;font-size:13px}.eyebrow{font-size:11px}.photo-caption{font-size:12px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}@media print{.header,.footer,.toc,.reading-progress{display:none}.container{width:100%}.article-layout{display:block}.btn{display:none}}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}

/* Natural pool article and the expanded journal. */
@media(min-width:851px){.cards{grid-template-columns:repeat(2,minmax(0,1fr))}.card-image{aspect-ratio:1.9}.card h3{font-size:30px}}
.pool-section{border-top:1px solid var(--line);margin-top:42px;padding-top:30px;scroll-margin-top:128px}.pool-section h2{display:flex;gap:15px;align-items:baseline}.pool-section h2>span{font:400 21px var(--serif);color:var(--link)}.facts{display:grid;grid-template-columns:1fr 1fr;gap:20px;border-bottom:1px solid var(--line);padding:0 0 20px;margin:0 0 24px;font-size:14px;line-height:1.6}.facts dt{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--slate);margin-bottom:6px}.facts dd{margin:0;font-weight:600;color:var(--navy)}.caption{font-size:12px;line-height:1.7;color:var(--slate);margin-top:12px}.article-body figure img{height:auto}.source-link{font-size:14px;line-height:1.7}.comparison{overflow-x:auto;margin:26px 0}.comparison th:first-child{min-width:140px}.small{font-size:14px;color:var(--slate)}.muted{color:var(--slate)}.questions details{border-bottom:1px solid var(--line);padding:17px 0}.questions summary{cursor:pointer;list-style:none;display:flex;justify-content:space-between;gap:20px;font-size:16px;line-height:1.6;font-weight:600;color:var(--navy);min-height:44px;align-items:center}.questions summary::-webkit-details-marker{display:none}.questions summary:after{content:'+';font-size:24px;font-weight:400}.questions details[open] summary:after{content:'×'}.questions details p{font-size:16px;margin:16px 0 0}.endnote{background:var(--mist);padding:28px;border-radius:12px;margin-top:38px;font-size:16px}.endnote h3{margin-top:0}.endnote p:last-child{margin-bottom:0}.article-body .link{display:inline-flex;gap:12px;align-items:center;min-height:44px;font-size:14px;font-weight:600}
@media(max-width:600px){.facts{font-size:13px;gap:15px}.pool-section h2{gap:12px}.article-body{font-size:17px}.comparison th,.comparison td{font-size:13px}.pool-section{scroll-margin-top:100px}}