:root{--void:#04060d;--deep:#070b16;--surface:#0a0f1e;--surface-2:#0f1628;--surface-3:#16203a;--signal:#ff6a3d;--ice:#9fc4ff;--cyan:#38f0ff;--cyan-dim:#1aa8bd;--violet:#7b5cff;--violet-dim:#5940c9;--lime:#5ef08a;--amber:#ffb648;--rose:#ff5c8a;--text:#e6edff;--text-soft:#a9b8dd;--text-muted:#6c7ba3;--text-faint:#45527a;--line:#78aaff1f;--line-strong:#78aaff3d;--line-hot:#38f0ff73;--panel:#0a101eb8;--panel-solid:#0a101ef0;--grad-primary:linear-gradient(115deg, var(--cyan), var(--violet));--grad-text:linear-gradient(100deg, #7ef7ff 0%, #38f0ff 35%, #9d86ff 100%);--grad-line:linear-gradient(90deg, transparent, var(--cyan), transparent);--glow-cyan:0 0 0 1px #38f0ff40, 0 0 24px -4px #38f0ff66;--glow-violet:0 0 0 1px #7b5cff40, 0 0 24px -4px #7b5cff66;--shadow-lift:0 18px 50px -22px #000000f2;--font-serif:"Instrument Serif", "Iowan Old Style", Georgia, serif;--font-display:"Space Grotesk", system-ui, -apple-system, sans-serif;--font-mono:"JetBrains Mono", "Fira Code", ui-monospace, monospace;--fs-hero:clamp(2.6rem, 7vw, 5.2rem);--fs-h1:clamp(2rem, 4.6vw, 3.2rem);--fs-h2:clamp(1.5rem, 3vw, 2.2rem);--fs-h3:1.25rem;--fs-body:1rem;--fs-sm:.875rem;--fs-xs:.75rem;--sp-1:.25rem;--sp-2:.5rem;--sp-3:.75rem;--sp-4:1rem;--sp-5:1.5rem;--sp-6:2rem;--sp-7:3rem;--sp-8:4rem;--sp-9:6rem;--wrap:1200px;--wrap-narrow:760px;--nav-h:68px;--r-sm:4px;--r-md:8px;--r-lg:14px;--cut:14px;--ease:cubic-bezier(.22, 1, .36, 1);--ease-sharp:cubic-bezier(.65, 0, .35, 1);--t-fast:.18s;--t-mid:.35s;--t-slow:.7s}[data-cat=fisica]{--cat:var(--cyan)}[data-cat=astronomia]{--cat:var(--violet)}[data-cat=biologia]{--cat:var(--lime)}[data-cat=quimica]{--cat:var(--amber)}[data-cat=matematicas]{--cat:var(--rose)}[data-cat=tecnologia]{--cat:#5ad8ff}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body{background:var(--void);min-height:100vh;color:var(--text);font-family:var(--font-display);font-size:var(--fs-body);-webkit-font-smoothing:antialiased;flex-direction:column;line-height:1.65;display:flex;overflow-x:hidden}main{outline:none;flex:1}img,svg,canvas{max-width:100%;display:block}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer;background:0 0;border:none}ul,ol{list-style:none}h1,h2,h3,h4{letter-spacing:-.02em;text-wrap:balance;font-weight:600;line-height:1.15}p{text-wrap:pretty}::selection{color:#fff;background:#38f0ff47}#bg-field{z-index:-3;pointer-events:none;width:100%;height:100%;position:fixed;top:0;bottom:0;left:0;right:0}.bg-grid{z-index:-2;pointer-events:none;background-image:linear-gradient(#78aaff0e 1px,#0000 1px),linear-gradient(90deg,#78aaff0e 1px,#0000 1px);background-size:64px 64px;position:fixed;top:0;bottom:0;left:0;right:0;-webkit-mask-image:radial-gradient(110% 80% at 50% 0,#000 20%,#0000 78%);mask-image:radial-gradient(110% 80% at 50% 0,#000 20%,#0000 78%)}.bg-glow{z-index:-1;pointer-events:none;background:radial-gradient(70% 55% at 50% -10%,#38f0ff21,#0000 62%),radial-gradient(60% 50% at 88% 8%,#7b5cff1c,#0000 60%),radial-gradient(80% 60% at 10% 45%,#7b5cff0f,#0000 65%);position:fixed;top:0;bottom:0;left:0;right:0}.skip-link{z-index:100;padding:var(--sp-3) var(--sp-5);background:var(--cyan);color:var(--void);font-weight:600;position:absolute;top:0;left:-9999px}.skip-link:focus{left:var(--sp-4);top:var(--sp-4)}:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:var(--r-sm)}.visually-hidden{clip:rect(0 0 0 0);white-space:nowrap;width:1px;height:1px;position:absolute;overflow:hidden}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:var(--deep)}::-webkit-scrollbar-thumb{background:linear-gradient(var(--cyan-dim), var(--violet-dim));border:2px solid var(--deep);border-radius:99px}::-webkit-scrollbar-thumb:hover{background:linear-gradient(var(--cyan), var(--violet))}html{scrollbar-color:var(--violet-dim) var(--deep);scrollbar-width:thin}@media 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solid;bottom:10px;left:10px}.btn{--btn-cut:10px;justify-content:center;align-items:center;gap:var(--sp-2);font-family:var(--font-mono);font-size:var(--fs-sm);letter-spacing:.08em;text-transform:uppercase;white-space:nowrap;transition:transform var(--t-fast) var(--ease), box-shadow var(--t-mid) var(--ease), background var(--t-mid) var(--ease), color var(--t-mid) var(--ease), border-color var(--t-mid) var(--ease);clip-path:polygon(var(--btn-cut) 0, 100% 0, 100% calc(100% - var(--btn-cut)), calc(100% - var(--btn-cut)) 100%, 0 100%, 0 var(--btn-cut));padding:.8rem 1.6rem;font-weight:500;display:inline-flex;position:relative}.btn:active{transform:translateY(1px)}.btn--primary{background:var(--signal);color:#1a0703;font-weight:700;box-shadow:0 8px 26px -12px #ff6a3db3}.btn--primary:hover{transform:translateY(-2px);box-shadow:0 14px 34px -12px #ff6a3dd9}.btn--ghost{border:1px solid 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8px}.badge--muted{color:var(--text-muted);border-color:var(--line);background:#78aaff0d}.badge--soon{color:var(--amber);background:#ffb6481a;border-color:#ffb64859}.filters{gap:var(--sp-2);margin-bottom:var(--sp-6);flex-wrap:wrap;display:flex}.filter{cursor:pointer;font-family:var(--font-mono);font-size:var(--fs-xs);letter-spacing:.1em;text-transform:uppercase;color:var(--text-muted);border:1px solid var(--line);transition:all var(--t-fast) var(--ease);background:#78aaff0a;border-radius:99px;padding:.45rem 1rem}.filter:hover{color:var(--text);border-color:var(--line-strong)}.filter[aria-current=true],.filter[aria-pressed=true]{color:var(--void);background:var(--cyan);border-color:var(--cyan);box-shadow:0 0 20px -6px var(--cyan);font-weight:700}.card-grid{gap:var(--sp-5);grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));display:grid}.card{--cut:16px;background:var(--panel);border:1px solid var(--line);clip-path:polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));transition:transform var(--t-mid) var(--ease), border-color var(--t-mid) var(--ease), background var(--t-mid) var(--ease);flex-direction:column;display:flex;position:relative;overflow:hidden}.card:after{content:"";background:linear-gradient(90deg, var(--cat,var(--cyan)), transparent 70%);opacity:.5;height:2px;transition:opacity var(--t-mid) var(--ease);position:absolute;top:0;left:0;right:0}.card:hover{border-color:color-mix(in oklab, var(--cat,var(--cyan)) 45%, transparent);background:var(--panel-solid);transform:translateY(-6px)}.card:hover:after{opacity:1}.card__media{aspect-ratio:16/9;background:radial-gradient(circle at 30% 30%, color-mix(in oklab, var(--cat,var(--cyan)) 22%, transparent), transparent 60%), var(--surface-2);border-bottom:1px solid var(--line);position:relative;overflow:hidden}.card__media img{object-fit:cover;opacity:.82;width:100%;height:100%;transition:transform var(--t-slow) var(--ease), opacity 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#0000;position:sticky;top:0}.nav[data-scrolled=true]{border-bottom-color:var(--line);background:#04060ddb}.nav__inner{justify-content:space-between;align-items:center;gap:var(--sp-5);height:100%;display:flex}.brand{align-items:center;gap:var(--sp-3);letter-spacing:.16em;text-transform:uppercase;font-size:.95rem;font-weight:700;display:inline-flex}.brand__mark{width:26px;height:26px;color:var(--cyan);filter:drop-shadow(0 0 8px #38f0ff99);flex-shrink:0}.brand__mark circle,.brand__mark line,.brand__mark path{vector-effect:non-scaling-stroke}.nav__links{align-items:center;gap:var(--sp-2);display:flex}.nav__link{font-family:var(--font-mono);font-size:var(--fs-xs);letter-spacing:.14em;text-transform:uppercase;color:var(--text-muted);border-radius:var(--r-sm);transition:color var(--t-fast) var(--ease), background var(--t-fast) var(--ease);padding:.5rem .9rem;position:relative}.nav__link:hover{color:var(--text);background:#78aaff0f}.nav__link[aria-current=page]{color:var(--cyan)}.nav__link[aria-current=page]:after{content:"";background:var(--cyan);height:1px;box-shadow:0 0 8px var(--cyan);position:absolute;bottom:.1rem;left:.9rem;right:.9rem}.nav__toggle{width:40px;height:40px;color:var(--text-soft);border:1px solid var(--line);border-radius:var(--r-sm);place-items:center;display:none}.footer{margin-top:var(--sp-9);border-top:1px solid var(--line);background:linear-gradient(#0000,#070b16cc)}.footer__inner{gap:var(--sp-6);padding-block:var(--sp-7) var(--sp-5);grid-template-columns:1.4fr 1fr 1fr;display:grid}.footer__col h4{font-family:var(--font-mono);font-size:var(--fs-xs);letter-spacing:.18em;text-transform:uppercase;color:var(--text-faint);margin-bottom:var(--sp-4)}.footer__col li+li{margin-top:var(--sp-2)}.footer__col a,.footer__col span{color:var(--text-muted);font-size:var(--fs-sm);transition:color var(--t-fast) var(--ease)}.footer__col a:hover{color:var(--cyan)}.footer__tagline{color:var(--text-muted);font-size:var(--fs-sm);max-width:40ch;margin-top:var(--sp-3)}.footer__bottom{justify-content:space-between;align-items:center;gap:var(--sp-4);padding-block:var(--sp-4);border-top:1px solid var(--line);font-family:var(--font-mono);font-size:var(--fs-xs);color:var(--text-faint);letter-spacing:.06em;flex-wrap:wrap;display:flex}.empty{padding:var(--sp-8) var(--sp-5);text-align:center;border:1px dashed var(--line-strong);border-radius:var(--r-lg)}.empty__icon{font-family:var(--font-mono);color:var(--text-faint);margin-bottom:var(--sp-3);font-size:2rem}.empty h3{font-size:var(--fs-h3);margin-bottom:var(--sp-2)}.empty p{color:var(--text-muted);font-size:var(--fs-sm);max-width:46ch;margin-inline-start:auto;margin-inline-end:auto}.reveal{opacity:0;transition:opacity .7s var(--ease), transform .7s var(--ease);transition-delay:var(--reveal-delay,0s);transform:translateY(22px)}.reveal.is-visible{opacity:1;transform:none}@media (max-width:860px){.footer__inner{grid-template-columns:1fr 1fr}.footer__col:first-child{grid-column:1/-1}}@media (max-width:720px){:root{--nav-h:60px}.nav__toggle{display:grid}.nav__links{top:var(--nav-h);padding:var(--sp-3);border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);transform-origin:top;background:#04060df7;flex-direction:column;align-items:stretch;gap:0;display:none;position:absolute;left:0;right:0}.nav__links[data-open=true]{display:flex}.nav__link{padding:var(--sp-3) var(--sp-4);font-size:var(--fs-sm)}.nav__link[aria-current=page]:after{display:none}.section{padding-block:var(--sp-7)}}.hero{min-height:calc(100svh - var(--nav-h));padding-block:var(--sp-8);align-items:center;display:flex;position:relative;overflow:hidden}.hero__inner{align-items:center;gap:var(--sp-8);width:100%;display:grid}.hero__title{font-family:var(--font-serif);font-size:var(--fs-hero);letter-spacing:-.015em;margin-block:var(--sp-5) var(--sp-5);font-weight:400;line-height:1.02}.hero__title span{display:block}.hero__title-accent{font-style:italic}.hero__lead{color:var(--text-soft);max-width:52ch;margin-bottom:var(--sp-5);font-size:clamp(1rem,1.6vw,1.15rem)}.hero__lead--soft{color:var(--text-muted);margin-bottom:var(--sp-6);font-size:clamp(.94rem,1.4vw,1.03rem)}.catalog__count{color:var(--text-muted)}.hero__actions{gap:var(--sp-3);flex-wrap:wrap;display:flex}.hero__stats{gap:var(--sp-6);margin-top:var(--sp-8);padding-top:var(--sp-5);border-top:1px solid var(--line);flex-wrap:wrap;display:flex}.stat__num{font-family:var(--font-mono);color:var(--text);font-size:1.7rem;font-weight:700;line-height:1;display:block}.stat__label{margin-top:var(--sp-2);font-family:var(--font-mono);font-size:var(--fs-xs);letter-spacing:.16em;text-transform:uppercase;color:var(--text-faint);display:block}.railroad{gap:var(--sp-3);padding-bottom:var(--sp-3);scrollbar-width:none;display:flex;overflow-x:auto}.railroad::-webkit-scrollbar{display:none}.topic{--cut:10px;text-align:left;align-items:flex-start;gap:var(--sp-2);min-width:190px;font:inherit;color:inherit;cursor:pointer;padding:var(--sp-4) var(--sp-5);background:var(--panel);border:1px solid var(--line);clip-path:polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 var(--cut));transition:border-color var(--t-mid) var(--ease), transform var(--t-mid) var(--ease);flex-direction:column;flex:none;display:flex}.topic:hover{border-color:color-mix(in oklab, var(--cat,var(--cyan)) 50%, transparent);transform:translateY(-4px)}.topic__icon{font-size:1.4rem;line-height:1}.topic__name{font-size:.95rem;font-weight:600}.topic__count{font-family:var(--font-mono);font-size:var(--fs-xs);color:var(--text-faint);letter-spacing:.1em}.steps{gap:var(--sp-5);counter-reset:step;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));display:grid}.step{padding:var(--sp-6) var(--sp-5) var(--sp-5);border:1px solid var(--line);border-radius:var(--r-lg);counter-increment:step;background:linear-gradient(#0f162880,#0000);position:relative}.step:before{content:"0" counter(step);top:var(--sp-4);right:var(--sp-5);font-family:var(--font-mono);color:#78aaff14;font-size:2.4rem;font-weight:700;line-height:1;position:absolute}.step h3{margin-bottom:var(--sp-2);font-size:1.05rem}.step p{color:var(--text-muted);font-size:var(--fs-sm)}.step__mark{width:34px;height:34px;margin-bottom:var(--sp-4);border-radius:var(--r-sm);background:color-mix(in oklab, var(--cat,var(--cyan)) 14%, transparent);border:1px solid color-mix(in oklab, var(--cat,var(--cyan)) 35%, transparent);color:var(--cat,var(--cyan));place-items:center;font-size:1rem;display:grid}.cta{--cut:20px;text-align:center;padding:var(--sp-8) var(--sp-5);background:radial-gradient(ellipse 70% 120% at 50% 0%, #7b5cff29, transparent 70%), var(--panel);border:1px solid var(--line-strong);position:relative;overflow:hidden}.cta h2{font-size:var(--fs-h1);margin-block:var(--sp-4) var(--sp-4)}.cta p{color:var(--text-soft);max-width:50ch;margin-inline-start:auto;margin-inline-end:auto;margin-bottom:var(--sp-6)}.detail__head{padding-block:var(--sp-8) var(--sp-6);border-bottom:1px solid var(--line)}.crumbs{align-items:center;gap:var(--sp-2);font-family:var(--font-mono);font-size:var(--fs-xs);letter-spacing:.1em;text-transform:uppercase;color:var(--text-faint);margin-bottom:var(--sp-5);display:flex}.crumbs a:hover{color:var(--cyan)}.detail__title{font-size:var(--fs-h1);margin-block:var(--sp-4);max-width:20ch}.detail__lead{color:var(--text-soft);max-width:58ch;font-size:1.08rem}.detail__tags{gap:var(--sp-2);margin-top:var(--sp-5);flex-wrap:wrap;display:flex}.detail__body{gap:var(--sp-7);padding-block:var(--sp-7);grid-template-columns:minmax(0,1fr) 280px;align-items:start;display:grid}.stage{--cut:18px;aspect-ratio:16/10;place-items:center;gap:var(--sp-4);padding:var(--sp-6);text-align:center;background:radial-gradient(circle at 50% 40%, color-mix(in oklab, var(--cat,var(--cyan)) 10%, transparent), transparent 65%), var(--surface);border:1px solid var(--line-strong);clip-path:polygon(var(--cut) 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%, 0 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