:root{--ink:#10162a;--navy:#002c72;--blue:#2970ff;--coral:#ff7a45;--yellow:#ffc83d;--turquoise:#35c9e8;--green:#34c759;--purple:#7c5cff;--paper:#f4f7ff;--white:#fff;--line:rgba(16,22,42,.13);--shadow:0 28px 70px rgba(16,22,42,.14)}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.55}h1,h2,p{margin-top:0}a{color:inherit;text-decoration:none}button{font:inherit;color:inherit}a,button{touch-action:manipulation;-webkit-tap-highlight-color:rgba(41,112,255,.18)}.container{width:min(1180px,calc(100% - 40px));margin:auto}.skip-link{position:fixed;top:-60px;left:16px;z-index:100;background:var(--ink);color:#fff;padding:10px 16px;border-radius:0 0 10px 10px}.skip-link:focus{top:0}
.site-header{position:relative;z-index:20;background:#fff;border-bottom:1px solid var(--line)}.nav-wrap{height:86px;display:flex;align-items:center;justify-content:space-between}.logo{display:flex;height:38px}.logo img{height:100%;width:auto}.main-nav{display:flex;align-items:center;gap:30px;font-size:14px;font-weight:650}.main-nav>a:not(.button):hover{color:var(--blue)}.menu-toggle{display:none;border:0;background:transparent;padding:8px}.menu-toggle span{display:block;width:25px;height:2px;background:var(--ink);margin:5px}.button{display:inline-flex;align-items:center;justify-content:center;gap:12px;border-radius:999px;padding:11px 19px;background:var(--blue);color:#fff;font-weight:750}.button-coral{background:var(--coral)}
.course-hero{padding:46px 0 72px;background:linear-gradient(135deg,#fff 8%,#edf3ff 58%,rgba(53,201,232,.2))}.back-link{display:inline-block;margin-bottom:24px;color:#53627a;font-size:13px;font-weight:700}.back-link:hover{color:var(--blue)}.hero-card{display:grid;grid-template-columns:1fr .72fr;min-height:540px;border-radius:32px;overflow:hidden;background:var(--navy);color:#fff;box-shadow:var(--shadow)}.hero-copy{display:flex;flex-direction:column;justify-content:center;padding:64px}.eyebrow{margin-bottom:16px;color:var(--turquoise);font-size:10px;font-weight:850;letter-spacing:.13em;text-transform:uppercase}.hero-copy h1{margin-bottom:25px;font-size:clamp(44px,5.6vw,72px);line-height:.98;letter-spacing:-.055em}.hero-copy h1 em{font-family:Georgia,serif;font-weight:400;color:var(--yellow)}.hero-copy>p:not(.eyebrow){max-width:650px;color:#cad7eb;font-size:16px}.hero-image{margin:0;min-height:540px;overflow:hidden}.hero-image img{display:block;width:100%;height:100%;object-fit:cover}.course-meta{display:flex;flex-wrap:wrap;gap:9px;margin-top:26px}.course-meta span{padding:9px 12px;border:1px solid rgba(255,255,255,.2);border-radius:10px;color:#c6d4e8;font-size:11px}.course-meta b{display:block;color:#fff;font-size:9px;text-transform:uppercase;letter-spacing:.08em}
.classroom{padding:90px 0 110px}.classroom-grid{display:grid;grid-template-columns:minmax(0,1fr) 350px;gap:32px;align-items:start}.lesson-main{min-width:0}.section-label{display:flex;align-items:center;gap:14px;margin-bottom:18px}.section-label>span{display:grid;place-items:center;width:45px;height:45px;border-radius:14px;background:var(--yellow);font-size:13px;font-weight:850}.section-label div{display:flex;flex-direction:column}.section-label small,.lesson-list-head small{color:#738097;font-size:9px;font-weight:800;letter-spacing:.13em}.section-label strong{font-size:18px}.video-shell{position:relative;aspect-ratio:16/9;border:8px solid var(--ink);border-radius:25px;background:linear-gradient(145deg,#0a1740,#07102b);overflow:hidden;box-shadow:12px 12px 0 var(--turquoise);contain:layout paint}.video-shell iframe{width:100%;height:100%;border:0}.video-placeholder{position:absolute;inset:0;width:100%;border:0;display:grid;place-items:center;align-content:center;padding:30px;text-align:center;color:#fff;background-color:#07102b;background-image:linear-gradient(rgba(53,201,232,.06) 1px,transparent 1px),linear-gradient(90deg,rgba(53,201,232,.06) 1px,transparent 1px);background-size:35px 35px;cursor:pointer}.video-placeholder:disabled{cursor:default;opacity:1}.video-placeholder:not(:disabled):hover .play-icon,.video-placeholder:not(:disabled):focus-visible .play-icon{transform:scale(1.06)}.video-placeholder:focus-visible{outline:4px solid var(--yellow);outline-offset:-4px}.play-icon{display:grid;place-items:center;width:76px;height:76px;margin-bottom:20px;padding-left:5px;border-radius:50%;background:var(--coral);box-shadow:0 0 0 10px rgba(255,122,69,.16);font-size:25px;transition:transform .18s}.video-placeholder strong{font-size:24px}.video-placeholder p{max-width:480px;margin:8px 0 0;color:#aebed8}.lesson-note{margin-top:45px;padding:38px;border-radius:24px;background:#fff;border:1px solid var(--line)}.lesson-note h2{max-width:620px;font-size:clamp(30px,3.6vw,44px);line-height:1.06;letter-spacing:-.04em}.lesson-note>p:last-child{margin:0;color:#677286}
.lesson-list{position:sticky;top:24px;border-radius:24px;background:#fff;border:1px solid var(--line);box-shadow:0 18px 45px rgba(16,22,42,.08);overflow:hidden}.lesson-list-head{display:flex;justify-content:space-between;align-items:start;padding:26px;border-bottom:1px solid var(--line)}.lesson-list-head h2{margin:3px 0 0;font-size:25px}.lesson-list-head>span{padding:5px 9px;border-radius:999px;background:#edf3ff;color:var(--blue);font-size:9px;font-weight:800}.lesson-list ol{list-style:none;margin:0;padding:10px}.lesson-list li{display:grid;grid-template-columns:34px 1fr 20px;gap:10px;align-items:center;padding:16px;border-radius:14px;color:#68748a}.lesson-list li+li{border-top:1px solid #edf0f5}.lesson-list li>span{font-size:10px;font-weight:850}.lesson-list li div{display:flex;flex-direction:column}.lesson-list li strong{color:var(--ink);font-size:13px}.lesson-list li small{font-size:10px}.lesson-list li>b{text-align:center;font-size:11px}.lesson-list li.current{background:#edf3ff;color:var(--blue)}.lesson-list li.current strong{color:var(--blue)}.support-card{margin:10px;padding:20px;border-radius:16px;background:var(--yellow)}.support-card p{margin:5px 0 12px;font-size:12px}.support-card a{font-size:11px;font-weight:800}
footer{background:var(--navy);color:#fff;padding:75px 0 25px}.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:70px}.footer-logo{height:43px}.footer-grid p{color:#aabcb8;margin-top:22px}.footer-grid>div:not(:first-child){display:flex;flex-direction:column;gap:10px}.footer-grid>div>strong{margin-bottom:10px;color:var(--turquoise)}.footer-grid a:not(.logo){color:#d5dfdc;font-size:14px}.social-links{display:flex;gap:10px;margin-top:8px}.social-links a{display:grid!important;place-items:center;width:40px;height:40px;border:1px solid rgba(255,255,255,.22);border-radius:50%;font-weight:800}.social-links a:hover{background:var(--coral)}.social-links svg{width:19px;height:19px;fill:none;stroke:#fff;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.social-links a:nth-child(2) svg{fill:#fff;stroke:none}.social-links a:nth-child(3) svg path:first-child{fill:none}.social-links .play{fill:#fff;stroke:none}.footer-bottom{display:flex;justify-content:space-between;border-top:1px solid #405851;margin-top:60px;padding-top:22px;color:#94aaa4;font-size:12px}
@media(max-width:900px){.hero-card{grid-template-columns:1fr}.hero-image{min-height:0;aspect-ratio:16/10}.classroom-grid{grid-template-columns:1fr}.lesson-list{position:static}.main-nav{position:absolute;top:76px;left:20px;right:20px;display:none;flex-direction:column;align-items:stretch;padding:24px;border-radius:20px;background:#fff;box-shadow:var(--shadow)}.main-nav.open{display:flex}.menu-toggle{display:block}.footer-grid{grid-template-columns:1fr 1fr}.footer-grid>div:first-child{grid-column:1/-1}}
@media(max-width:620px){.container{width:min(100% - 28px,1180px)}.nav-wrap{height:72px}.logo{height:31px}.course-hero{padding:28px 0 55px}.hero-card{border-radius:24px}.hero-copy{padding:38px 25px}.hero-copy h1{font-size:42px}.hero-image{aspect-ratio:1}.course-meta{display:grid;grid-template-columns:1fr 1fr}.classroom{padding:65px 0 80px}.video-shell{border-width:5px;border-radius:18px;box-shadow:7px 7px 0 var(--turquoise)}.video-placeholder{padding:18px}.play-icon{width:58px;height:58px}.video-placeholder strong{font-size:18px}.video-placeholder p{font-size:12px}.lesson-note{padding:27px 22px}.footer-grid{grid-template-columns:1fr}.footer-grid>div:first-child{grid-column:auto}.footer-bottom{flex-direction:column;gap:8px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}

/* Las secciones alejadas se dibujan sólo cuando entran en pantalla. */
.classroom,footer{content-visibility:auto;contain-intrinsic-size:1px 900px}

/* Identidad global del footer */
.footer-logo.footer-mark{display:block;width:58px;height:58px}
.footer-logo.footer-mark img{display:block;width:100%;height:100%;object-fit:contain;filter:brightness(0) invert(1)}
.footer-grid>div:first-child>p{margin-top:15px;color:#fff;font-size:15px}
.social-links svg{display:none}.social-links a{position:relative}.social-links a:before{content:"";width:19px;height:19px;background:#fff;mask-repeat:no-repeat;mask-position:center;mask-size:contain;-webkit-mask-repeat:no-repeat;-webkit-mask-position:center;-webkit-mask-size:contain}.social-links a:nth-child(1):before{mask-image:url("/icon-instagram.svg");-webkit-mask-image:url("/icon-instagram.svg")}.social-links a:nth-child(2):before{mask-image:url("/icon-facebook.svg");-webkit-mask-image:url("/icon-facebook.svg")}.social-links a:nth-child(3):before{mask-image:url("/icon-youtube.svg");-webkit-mask-image:url("/icon-youtube.svg")}
@media(max-width:620px){.footer-logo.footer-mark{width:50px;height:50px}}
@media(max-width:900px){.main-nav a{display:flex;align-items:center;justify-content:center;min-height:44px;text-align:center}}

/* Navegación contextual e interconexión entre contenidos educativos. */
.breadcrumb{display:flex;align-items:center;gap:8px;margin-bottom:14px;color:#53627a;font-size:11px;font-weight:750}
.breadcrumb a{text-decoration:underline;text-underline-offset:3px}.breadcrumb a:hover{color:var(--blue)}
.related-card{margin:10px;padding:20px;border:1px solid var(--line);border-radius:16px;background:#edf3ff}
.related-card p{margin:5px 0 12px;color:#5f6d80;font-size:12px}.related-card a{color:var(--blue);font-size:11px;font-weight:800}

.course-guide{padding:90px 0 105px;background:#fff}
.course-guide>div>h2{max-width:760px;margin:10px 0 18px;font-size:clamp(34px,4.5vw,55px);line-height:1.03;letter-spacing:-.045em}
.guide-lead{max-width:780px;color:#627087;font-size:16px}
.guide-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-top:34px}
.guide-grid article{padding:26px;border:1px solid var(--line);border-radius:20px;background:var(--paper)}
.guide-grid h3{margin:0 0 9px;font-size:18px}.guide-grid p{margin:0;color:#68748a;font-size:13px}
@media(max-width:760px){.guide-grid{grid-template-columns:1fr}.course-guide{padding:68px 0 78px}}