:root{--ink:#172022;--blue:#204ae8;--lime:#e2fc77;--paper:#fff;--line:#dce0df;--muted:#606767;--serif:'Instrument Serif',Georgia,serif;--sans:'DM Sans',Arial,sans-serif}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:110px}body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:1rem;line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button{font:inherit}button,a{-webkit-tap-highlight-color:transparent}a:focus-visible,button:focus-visible{outline:3px solid var(--blue);outline-offset:5px}.sr-only{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.container{max-width:1360px;padding-inline:48px;margin-inline:auto}.skip-link{position:fixed;top:-100px;left:20px;background:var(--ink);color:white;padding:12px 24px;z-index:100}.skip-link:focus{top:12px}.site-header{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.97);border-bottom:1px solid var(--line)}.header-inner{height:104px;display:flex;align-items:center;justify-content:space-between;gap:28px}.brand{display:inline-flex;flex-direction:column;line-height:1;flex-shrink:0}.brand>span{font-size:0.75rem;font-weight:800;letter-spacing:.15em;margin-left:2px}.brand>strong{font-size:2.9375rem;line-height:.99;font-weight:900;letter-spacing:-.07em}.brand-dot{color:var(--blue)}.main-nav{display:flex;gap:32px}.main-nav>a{font-size:0.875rem;font-weight:600;position:relative;padding:10px 0}.main-nav>a:after{content:'';position:absolute;left:0;right:0;bottom:5px;height:2px;background:var(--blue);transform:scaleX(0);transform-origin:left;transition:transform .2s}.main-nav>a:hover:after,.main-nav>a[aria-current]:after{transform:scaleX(1)}.button{display:inline-flex;align-items:center;justify-content:center;gap:12px;border:1px solid transparent;min-height:52px;padding:13px 23px;font-size:0.875rem;font-weight:700;line-height:1.4;border-radius:5px;transition:background .2s,transform .2s,color .2s}.button:hover{transform:translateY(-2px)}.button-small{min-height:42px;padding:10px 15px;background:var(--ink);color:#fff;font-size:0.8125rem}.play-icon{font-size:0.75rem}.button-primary{background:var(--blue);color:#fff}.button-primary:hover{background:#1435b1}.button-outline{border-color:var(--ink);background:transparent}.button-outline:hover{background:var(--ink);color:white}.text-link{font-size:0.875rem;font-weight:650;text-decoration:underline;text-underline-offset:5px;text-decoration-thickness:1px}.text-link:hover{color:var(--blue)}.menu-toggle{display:none}.hero{display:grid;grid-template-columns:1fr 1fr;gap:36px;padding-top:50px;padding-bottom:52px;align-items:center}.eyebrow{display:flex;align-items:center;gap:10px;font-size:0.75rem;font-weight:750;letter-spacing:.13em;margin:0 0 23px;line-height:1.5}.asterisk{font-size:1.375rem;color:var(--blue);line-height:1}h1,h2,h3,p,figure{margin-top:0}h1{font-size:clamp(57px,5.6vw,82px);letter-spacing:-.065em;line-height:1.05;font-weight:650;margin-bottom:25px}h1 em{font-family:var(--serif);font-weight:400;color:var(--blue);letter-spacing:-.035em;font-size:1.1em;line-height:1.05}h2{font-size:clamp(32px,3.15vw,45px);line-height:1.16;letter-spacing:-.045em;font-weight:600;margin-bottom:0}h2 em{font-family:var(--serif);font-size:1.15em;font-weight:400;letter-spacing:-.035em}.hero-description{font-size:1.125rem;line-height:1.6;color:#565e5e;margin-bottom:28px}.hero-actions{display:flex;align-items:center;gap:25px}.hero-note{font-size:0.75rem;color:#737979;margin-top:34px;margin-bottom:0}.hero-art{position:relative;overflow:hidden;isolation:isolate;border-radius:7px;margin:0;min-height:560px;align-self:stretch;background:#0944ac}.hero-art>img{position:absolute;width:100%;height:100%;object-fit:cover;object-position:62% center;inset:0}.hero-art:after{content:'';position:absolute;inset:60% 0 0;background:linear-gradient(transparent,rgba(0,21,63,.8));z-index:0}.image-label{position:absolute;top:25px;left:26px;border:1px solid #ffffff60;color:white;padding:6px 11px;font-size:0.75rem;letter-spacing:.13em;border-radius:2px;background:#123f9440}.hero-art figcaption{position:absolute;bottom:28px;left:30px;right:30px;display:flex;justify-content:space-between;align-items:flex-end;z-index:1;color:#fff;font-size:1.4375rem;line-height:1.2;font-weight:500;letter-spacing:-.02em}.art-star{font-size:3.625rem;line-height:1;color:var(--lime)}.topic-strip{border-block:1px solid var(--line);background:#f7f8f8}.topic-inner{display:grid;grid-template-columns:1fr 1.15fr 1fr;padding-top:21px;padding-bottom:21px;gap:24px}.topic-inner>span{display:flex;align-items:center;gap:15px;font-size:0.875rem;font-weight:600}.topic-inner>span:nth-child(2){justify-content:center;border-inline:1px solid #d5dad8}.topic-inner>span:last-child{justify-content:flex-end}.topic-inner small{font-size:0.75rem;font-weight:500;color:var(--blue)}.section{padding-block:90px}.section-label{color:#727878;font-size:0.75rem;letter-spacing:.14em;margin-bottom:20px}.about-section{display:grid;grid-template-columns:1.1fr 1fr;gap:100px}.about-section h2{font-size:2.4375rem}.about-copy p{font-size:1rem;line-height:1.8;color:#646a69;margin-bottom:18px}.about-copy p:first-child{color:var(--ink);font-size:1.125rem;line-height:1.65}.about-copy .text-link{display:inline-block;margin-top:8px}.video-section{border-top:1px solid var(--line);padding-top:74px}.section-heading{display:flex;align-items:flex-end;justify-content:space-between;gap:32px;margin-bottom:38px}.section-heading .button{white-space:nowrap}.section-heading h2{font-size:2.4375rem}.video-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:26px}.video-image{position:relative;display:flex;flex-direction:column;align-items:flex-start;justify-content:space-between;aspect-ratio:16/10;padding:22px;border-radius:6px;overflow:hidden;background:#dfe7f9}.video-dna{background:#d7e5f7;color:#1d3c77}.video-inventions{background:#e2fc77;color:#24432e}.video-biology{background:#f9a27b;color:#602510}.video-topic{font-size:0.75rem;letter-spacing:.12em;font-weight:700;border:1px solid currentColor;border-radius:2px;padding:3px 7px;position:relative;z-index:2}.video-typography{font-size:clamp(28px,3vw,42px);line-height:1.1;font-weight:550;letter-spacing:-.04em;margin-top:12px;margin-bottom:8px}.video-typography em{font-family:var(--serif);font-weight:400;font-size:1.2em}.play-circle{position:absolute;width:44px;height:44px;background:#fff;border-radius:50%;display:grid;place-items:center;right:19px;bottom:20px;padding-left:2px;font-size:0.8125rem;color:var(--ink);transition:transform .2s;z-index:2;box-shadow:0 3px 20px #0001}.video-image:hover .play-circle{transform:scale(1.12)}.video-image:has(img){padding:0;aspect-ratio:16/9;background:var(--ink)}.video-image img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .3s}.video-image:hover img{transform:scale(1.035)}.video-image:has(img) .video-topic{position:absolute;top:15px;left:15px;background:#fff;border:0;color:var(--ink)}.video-details{padding:19px 2px 0}.video-category{font-size:0.75rem;color:var(--blue);font-weight:750;letter-spacing:.09em;margin-bottom:11px}.video-details h3{font-size:1.1875rem;letter-spacing:-.025em;line-height:1.45;font-weight:600;margin:0}.video-details h3 a:hover{text-decoration:underline;text-underline-offset:4px}.books-section{background:#172623;color:#fff;padding-bottom:70px}.books-heading{margin-bottom:43px}.books-heading .section-label{color:#c1d6ba}.books-heading h2{font-size:3.375rem}.books-heading h2 em{color:var(--lime)}.books-heading>p{font-size:1rem;line-height:1.8;color:#c0ceca;margin:0 0 3px;max-width:350px}.book-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:23px}.book-card{background:#eef4fc;color:#182f53;display:flex;flex-direction:column;padding:27px 27px 25px;border-radius:5px;min-width:0}.tech-book{background:#e2fc77;color:#263f22}.animals-book{background:#f9b88f;color:#5e301b}.book-top{display:flex;justify-content:space-between;gap:8px;font-size:0.75rem;font-weight:700;letter-spacing:.07em;border-bottom:1px solid #0002;padding-bottom:15px}.book-number{font-size:7.5rem;line-height:1.15;letter-spacing:-.08em;font-weight:500;padding-block:24px 21px}.book-number>span{display:inline-block;font-family:var(--serif);font-size:2.1875rem;font-style:italic;letter-spacing:-.045em;margin-left:12px;font-weight:400}.book-card h3{font-size:1.3125rem;line-height:1.35;letter-spacing:-.035em;font-weight:650;margin-bottom:16px}.book-card p{font-size:0.875rem;line-height:1.7;color:inherit;opacity:.85;margin-bottom:29px;flex:1}.book-link{background:transparent;border:1px solid #0005;padding:13px 11px;width:100%;font-size:0.8125rem}.book-link:hover{background:#fff7}.books-note{font-size:0.75rem;color:#bbc9c5;margin:28px 0 0}.community-section{display:grid;grid-template-columns:.9fr 1.1fr;gap:90px;padding-block:105px}.community-intro h2{font-size:3rem;margin-bottom:25px}.community-intro h2 em{color:var(--blue)}.community-intro>p:last-child{font-size:1rem;color:var(--muted);line-height:1.8}.social-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;align-content:center}.social-card{display:flex;gap:15px;align-items:center;border:1px solid var(--line);border-radius:5px;padding:20px 18px;min-width:0;transition:border-color .2s,background .2s}.social-card:hover{border-color:var(--blue);background:#f6f8ff}.social-symbol{width:29px;flex-shrink:0;text-align:center;font-size:1.9375rem;line-height:1;color:var(--ink)}.youtube-symbol{font-size:1.375rem;color:#d32b27}.facebook-symbol{font-weight:900;font-family:Arial;color:#2350be}.social-card strong{display:block;font-size:0.9375rem;font-weight:700}.social-card small{display:block;font-size:0.75rem;color:#737979;margin-top:2px;overflow-wrap:anywhere}.whatsapp-card{background:#eef6e5;border-color:#d4e4c5}.whatsapp-card .social-symbol{color:#346422}.closing-banner{background:var(--lime);padding-block:46px}.closing-banner>.container{display:flex;justify-content:space-between;align-items:center;gap:30px}.closing-banner p{font-size:2.625rem;line-height:1.16;letter-spacing:-.04em;font-weight:550;margin:0}.closing-banner p em{font-family:var(--serif);font-weight:400;font-size:1.17em}.closing-banner .container>span{font-size:6.5625rem;line-height:1;color:var(--blue)}.site-footer{display:flex;gap:30px;align-items:center;justify-content:space-between;min-height:150px;padding-block:35px}.footer-brand>strong{font-size:2.5625rem}.footer-brand>span{font-size:0.75rem}.site-footer p{font-size:0.75rem;margin:0;color:#535b58;line-height:1.8}.site-footer p>span{color:#7a817e}.site-footer>.text-link{font-size:0.75rem}
@media(min-width:1500px){.hero{padding-top:60px;padding-bottom:60px}.hero-art{min-height:570px}}
@media(max-width:1100px){.container{padding-inline:32px}.header-inner{gap:18px;height:90px}.main-nav{gap:22px}.hero{gap:26px;padding-top:36px;padding-bottom:36px}.hero-art{min-height:490px}.hero-actions{gap:20px;flex-wrap:wrap}h1{font-size:4.125rem}.hero-description{font-size:1.0625rem}.hero-note{font-size:0.75rem}.about-section{gap:50px}.about-section h2{font-size:2.125rem}.section{padding-block:70px}.section-heading h2{font-size:2.125rem}.section-heading .button{padding:12px 17px}.book-card{padding:21px}.book-number{font-size:5.9375rem}.book-number>span{font-size:1.8125rem;margin-left:8px}.book-card h3{font-size:1.1875rem}.community-section{gap:40px}.social-card{padding:17px 13px;gap:10px}.topic-inner{gap:16px}.topic-inner>span{font-size:0.75rem;gap:9px}.books-heading h2{font-size:3.125rem}.community-intro h2{font-size:2.6875rem}}
@media(max-width:800px){.header-cta{display:none}.main-nav{gap:25px}.hero{grid-template-columns:1fr 1fr;gap:22px}.hero-art{min-height:490px}h1{font-size:3.5rem}.hero-copy .eyebrow{font-size:0.75rem;letter-spacing:.08em}.hero-description{font-size:1rem}.hero-actions{gap:17px}.hero-note{line-height:1.7;font-size:0.75rem;margin-top:22px}.hero-art figcaption{left:20px;right:20px;font-size:1.25rem}.art-star{font-size:2.5rem}.image-label{left:20px;top:20px;font-size:0.75rem}.about-section{grid-template-columns:1fr;gap:26px}.about-section h2{font-size:2.4375rem}.about-copy{max-width:620px}.section-heading{align-items:flex-start}.section-heading h2{font-size:2rem}.video-grid{gap:18px}.video-details h3{font-size:1.0625rem}.video-image{padding:17px}.video-typography{font-size:1.6875rem}.play-circle{width:35px;height:35px;right:14px;bottom:14px;font-size:0.75rem}.book-grid{gap:14px}.book-card{padding:17px}.book-top{flex-wrap:wrap;font-size:0.75rem}.book-number{font-size:5.5rem;padding-block:20px;display:flex;flex-direction:column}.book-number>span{font-size:1.875rem;margin:0;line-height:1}.book-card h3{font-size:1.125rem}.book-card h3 br{display:none}.book-link{font-size:0.75rem;padding-inline:8px}.books-heading h2{font-size:2.75rem}.books-heading>p{font-size:0.875rem}.community-section{grid-template-columns:1fr;gap:30px}.community-intro>p:last-child br{display:none}.community-intro h2 br{display:none}.social-grid{grid-template-columns:repeat(3,1fr)}.social-card{padding:18px 13px}.social-card small{font-size:0.75rem}.social-symbol{font-size:1.6875rem;width:24px}.youtube-symbol{font-size:1.125rem}.closing-banner p{font-size:2.25rem}.topic-inner>span{font-size:0.75rem;gap:7px}.topic-inner small{font-size:0.75rem}}
@media(max-width:600px){html{scroll-padding-top:85px}.container{padding-inline:23px}.header-inner{height:80px;flex-wrap:wrap;gap:0}.brand>strong{font-size:2.5rem}.brand>span{font-size:0.75rem}.menu-toggle{display:flex;align-items:center;gap:14px;font-size:0.875rem;font-weight:600;background:none;border:1px solid var(--line);border-radius:5px;padding:8px 12px}.menu-toggle>span{font-size:1.125rem}.main-nav{display:none;position:absolute;top:79px;left:0;right:0;padding:18px 23px 22px;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 12px 15px #00000008;flex-direction:column;gap:0}.main-nav.is-open{display:flex}.main-nav>a{font-size:1rem;padding:11px 0}.hero{grid-template-columns:1fr;gap:30px;padding-top:36px;padding-bottom:30px}.hero-copy .eyebrow{font-size:0.75rem;margin-bottom:23px}.hero h1{font-size:4rem;line-height:1.03;margin-bottom:22px;letter-spacing:-.065em}.hero h1 br:first-child{display:initial}.hero-description{font-size:1.0625rem;max-width:360px}.hero-note{font-size:0.75rem;margin-top:25px}.hero-actions{gap:23px}.hero-actions .button{padding-inline:18px}.hero-art{min-height:350px;aspect-ratio:1.13}.hero-art>img{object-position:60% center}.hero-art figcaption{font-size:1.4375rem;bottom:24px;left:25px}.art-star{font-size:3.0625rem}.image-label{font-size:0.75rem;left:25px}.topic-inner{padding-top:20px;padding-bottom:20px;gap:12px;grid-template-columns:1fr}.topic-inner>span{justify-content:flex-start!important;font-size:0.8125rem;gap:14px}.topic-inner>span:nth-child(2){border:0}.topic-inner small{font-size:0.75rem}.section{padding-block:55px}.section-label{font-size:0.75rem;margin-bottom:16px}.about-section{gap:23px}.about-section h2{font-size:2.125rem}.about-copy p{font-size:1rem}.about-copy p:first-child{font-size:1.0625rem}.section-heading{display:block;margin-bottom:27px}.section-heading h2{font-size:2.125rem}.section-heading .button{margin-top:24px;min-height:45px;font-size:0.8125rem}.video-grid{grid-template-columns:1fr;gap:30px}.video-image{aspect-ratio:16/9;padding:25px}.video-typography{font-size:2.625rem}.play-circle{width:46px;height:46px;right:22px;bottom:22px;font-size:0.8125rem}.video-details{padding-top:16px}.video-details h3{font-size:1.25rem;line-height:1.45}.video-category{font-size:0.75rem;margin-bottom:7px}.books-heading h2{font-size:2.875rem}.books-heading>p{margin-top:22px;font-size:1rem}.book-grid{grid-template-columns:1fr;gap:20px}.book-card{padding:25px}.book-top{font-size:0.75rem}.book-number{display:block;font-size:7.8125rem;padding-block:20px}.book-number>span{font-size:2.5625rem;margin-left:13px}.book-card h3{font-size:1.5rem;max-width:280px}.book-card p{font-size:0.9375rem;margin-bottom:24px}.book-link{font-size:0.875rem}.books-note{font-size:0.75rem;line-height:1.8}.community-section{gap:27px}.community-intro h2{font-size:2.4375rem}.community-intro h2 br{display:block}.social-grid{grid-template-columns:1fr 1fr;gap:12px}.social-card{gap:10px;padding:18px 12px;align-items:flex-start}.social-symbol{font-size:1.6875rem;width:23px;margin-top:3px}.youtube-symbol{font-size:1.0625rem;margin-top:7px}.social-card strong{font-size:0.875rem}.social-card small{font-size:0.75rem}.closing-banner{padding-block:36px}.closing-banner p{font-size:1.875rem;line-height:1.25}.closing-banner .container>span{font-size:4rem;align-self:flex-end}.closing-banner .container{gap:15px}.site-footer{display:grid;grid-template-columns:auto 1fr;gap:26px;padding-block:30px}.site-footer p{text-align:right;font-size:0.75rem}.site-footer>.text-link{grid-column:1/-1;font-size:0.75rem}.footer-brand>strong{font-size:2.1875rem}.footer-brand>span{font-size:0.75rem}}
@media(max-width:360px){.hero h1{font-size:3.4375rem}.hero-actions{gap:18px}.hero-actions .button{font-size:0.8125rem}.hero-actions .text-link{font-size:0.8125rem}.social-grid{grid-template-columns:1fr}.social-card small{font-size:0.75rem}.closing-banner p{font-size:1.6875rem}.closing-banner .container>span{font-size:2.875rem}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{transition:none!important;animation:none!important}}

@media(max-width:600px){.hero h1{font-size:3.5rem}.hero-copy .eyebrow{font-size:.75rem}.book-top{letter-spacing:.02em}.social-card{min-height:87px}.button,.text-link{font-size:.875rem}}

.book-cover{margin:27px 0 25px;display:flex;flex-direction:column;align-items:center;gap:13px}.book-cover img{height:250px;width:auto;max-width:100%;object-fit:contain;filter:drop-shadow(7px 9px 7px #0002)}.book-cover figcaption{font-size:.75rem;opacity:.8}.video-image:has(img) .video-topic{display:none}@media(max-width:800px) and (min-width:601px){.book-cover img{height:210px}}@media(max-width:600px){.book-cover img{height:280px}}
@media(max-width:600px){.hero-art{min-height:0;width:100%;height:auto}.hero>*{min-width:0}}

/* Páginas y artículos comparten la identidad de la portada. */
.reading-page{max-width:850px;padding-block:65px 90px;overflow-wrap:anywhere}.reading-page h1{font-size:clamp(2.6rem,6vw,4.5rem);margin-block:25px}.reading-page .intro{font-size:1.2rem;color:var(--muted);margin-bottom:38px}.reading-page section{margin-block:35px}.reading-page section h2{font-size:2rem;margin-bottom:20px}.reading-page p,.reading-page li{font-size:1rem;line-height:1.8}.reading-page time{display:block;font-size:.875rem;color:var(--muted)}.draft-notice{padding:15px;border:1px solid var(--blue);background:#eef3ff;margin-bottom:25px}.page-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:22px;margin-top:30px}.page-list article{border:1px solid var(--line);padding:24px;border-radius:5px}.page-list h3{font-size:1.3rem}.page-list h3 a{text-decoration:underline;text-underline-offset:4px}.source-list a{overflow-wrap:anywhere;text-decoration:underline}.main-nav{flex-wrap:wrap}