:root{
  --navy:#071421; --navy2:#0c2238; --blue:#159ee4; --blue2:#57c9ff;
  --ink:#0a1930; --muted:#617489; --soft:#f3f7fa; --line:#dce6ee;
  --white:#fff; --warn:#fff5df; --warnline:#f5a623; --info:#ebf8ff;
  --success:#eafaf2; --danger:#fff0f0; --shadow:0 18px 50px rgba(10,32,53,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:#fff}
.wrap{width:min(1180px,calc(100% - 36px));margin:auto}
.topbar{position:sticky;top:0;z-index:50;background:rgba(7,20,33,.97);border-bottom:1px solid rgba(255,255,255,.08);backdrop-filter:blur(10px)}
.brand{min-height:74px;display:flex;align-items:center;gap:16px}
.brand-mark{font-size:27px;font-weight:950;color:#fff;letter-spacing:-1.2px}.brand-mark span{color:var(--blue2)}
.brand-copy{display:flex;flex-direction:column;color:#fff;line-height:1.2}.brand-copy small{color:#91a9bf}
.build{margin-left:auto;font-size:11px;font-weight:900;color:#9fdcff;border:1px solid rgba(87,201,255,.4);padding:8px 11px;border-radius:999px}
.back{display:inline-block;color:#b6e6ff;text-decoration:none;font-weight:800;margin-bottom:18px}
.lesson-hero{background:
radial-gradient(circle at 82% 20%,rgba(21,158,228,.22),transparent 26%),
linear-gradient(135deg,#06111c,#0b2944 65%,#071421);color:#fff;padding:58px 0 54px}
.lesson-kicker{font-size:11px;font-weight:950;letter-spacing:1.8px;color:#5ed0ff;margin-bottom:10px}
h1{font-size:clamp(42px,6vw,72px);line-height:1.01;letter-spacing:-3px;margin:0 0 16px}
h1 span{color:#56caff}
.lead{font-size:18px;line-height:1.7;color:#c8d7e5;max-width:850px;margin:0}
.lesson-shell{background:#edf3f7;padding:36px 0 74px}
.lesson-grid{display:grid;grid-template-columns:245px 1fr;gap:28px;align-items:start}
.lesson-nav{position:sticky;top:96px;background:#0a2035;color:#fff;border-radius:18px;padding:18px;box-shadow:var(--shadow)}
.lesson-nav strong{display:block;font-size:14px;margin-bottom:11px}
.lesson-nav a{display:block;color:#b8cbdc;text-decoration:none;padding:9px 0;border-bottom:1px solid rgba(255,255,255,.08);font-size:13px}
.lesson-nav a:hover{color:#fff}
.lesson-content{background:#fff;border-radius:22px;padding:34px;box-shadow:var(--shadow)}
.section-label{font-size:11px;font-weight:950;letter-spacing:1.3px;color:#1486bf}
.lesson-block{padding-bottom:38px;margin-bottom:38px;border-bottom:1px solid #e3ebf1}
.lesson-block:last-of-type{border-bottom:0}
.lesson-block h2{font-size:32px;letter-spacing:-1px;margin:8px 0 14px}
.lesson-block h3{font-size:19px;margin:18px 0 8px}
.lesson-block p{font-size:15px;line-height:1.82;color:#40566d;margin:0 0 14px}
.hero-visual{display:grid;grid-template-columns:1.05fr .95fr;gap:18px;margin-bottom:34px}
.hero-card{background:linear-gradient(135deg,#092037,#0c3558);color:#fff;border-radius:20px;padding:26px;min-height:240px;display:flex;flex-direction:column;justify-content:center}
.hero-card .icon{font-size:64px}.hero-card h2{font-size:30px;margin:12px 0 8px}.hero-card p{color:#c6d8e8!important;margin:0!important}
.hypoxia-diagram{position:relative;border-radius:20px;overflow:hidden;min-height:240px;background:linear-gradient(#75c9f3 0 38%,#dff3fd 38% 57%,#f8fbfd 57%)}
.hypoxia-diagram .plane{position:absolute;left:12%;top:16%;font-size:55px;transform:rotate(-8deg)}
.hypoxia-diagram .arrow{position:absolute;left:48%;top:18%;font-size:38px;color:#0f78ad}
.hypoxia-diagram .body{position:absolute;right:14%;bottom:24%;font-size:78px}
.hypoxia-diagram .tag{position:absolute;background:#071b2c;color:#fff;border-radius:9px;padding:8px 10px;font-size:11px;font-weight:900}
.hypoxia-diagram .t1{left:10%;bottom:15%}.hypoxia-diagram .t2{left:38%;bottom:15%}.hypoxia-diagram .t3{right:7%;bottom:7%}
.flow{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin:20px 0}
.flow div{background:#0b2136;color:#fff;border-radius:13px;padding:15px;text-align:center;min-height:88px;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:800}
.flow .arrowbox{background:#dff3fd;color:#1478a8;font-size:24px}
.two-col{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.info-card{border:1px solid var(--line);border-radius:15px;padding:18px;background:#fff}
.info-card h3{margin:0 0 7px}.info-card p{font-size:14px;margin:0!important}
.badge-row{display:flex;flex-wrap:wrap;gap:9px;margin:15px 0}
.badge-row span{padding:9px 12px;border-radius:999px;background:#eaf6fd;color:#0d719f;font-weight:850;font-size:12px}
.callout{border-radius:15px;padding:18px;margin:20px 0}.callout.info{background:var(--info);border-left:5px solid var(--blue)}.callout.warning{background:var(--warn);border-left:5px solid var(--warnline)}
.callout.danger{background:var(--danger);border-left:5px solid #e44747}.callout p{margin:6px 0 0!important}
.timeline{display:grid;gap:11px}.timeline-row{display:grid;grid-template-columns:150px 1fr;gap:14px;align-items:center;background:#f5f8fa;border:1px solid #e4ebf0;border-radius:13px;padding:13px 15px}
.timeline-row b{color:#1187c2}.timeline-row span{color:#536a80;font-size:14px}
.tuc-table{width:100%;border-collapse:separate;border-spacing:0;overflow:hidden;border:1px solid var(--line);border-radius:14px;margin:18px 0}
.tuc-table th{background:#0b2136;color:#fff;text-align:left;padding:13px}.tuc-table td{padding:12px 13px;border-top:1px solid #e7edf2}.tuc-table tr:nth-child(even) td{background:#f7fafc}
.case-card{background:linear-gradient(135deg,#071a2c,#0c3558);color:#fff;border-radius:18px;padding:22px;margin:20px 0}
.case-kicker{font-size:10px;letter-spacing:1.5px;color:#63d0ff;font-weight:950}.case-card h3{font-size:23px;margin:8px 0}.case-card p,.case-card li{color:#d3e0ea!important}.case-card ol{line-height:1.75}
.video-card{display:grid;grid-template-columns:92px 1fr;gap:18px;align-items:center;background:#0b2035;color:#fff;border-radius:18px;padding:20px}
.play{width:76px;height:76px;border-radius:50%;display:grid;place-items:center;background:#159ee4;font-size:30px}
.video-card h3{margin:0 0 6px}.video-card p{color:#b9ccdb!important;margin:0!important}.video-card small{display:block;color:#64cdfa;margin-top:8px}
.quiz-grid{display:grid;gap:10px}.quiz-grid details{border:1px solid var(--line);border-radius:13px;padding:13px 15px;background:#fbfdfe}.quiz-grid summary{cursor:pointer;font-weight:850}.quiz-grid p{margin:10px 0 0!important}
.takeaway{background:#071a2c;color:#fff;border-radius:18px;padding:22px;margin-top:24px}.takeaway h3{margin:0 0 12px}.takeaway ul{margin:0;padding-left:18px;line-height:1.8;color:#d4e1ec}
.lesson-actions{display:flex;justify-content:space-between;gap:12px;margin-top:26px}.lesson-actions a{text-decoration:none;font-weight:850;color:#1684bb}.lesson-actions .next{background:#168fd0;color:#fff;padding:11px 14px;border-radius:10px}
footer{background:#050c14;color:#91a6ba;padding:24px 0;font-size:13px}.footer-row{display:flex;justify-content:space-between;gap:20px}
@media(max-width:900px){.lesson-grid,.hero-visual{grid-template-columns:1fr}.lesson-nav{position:static}.two-col{grid-template-columns:1fr}.flow{grid-template-columns:1fr 1fr}.timeline-row{grid-template-columns:1fr}.video-card{grid-template-columns:1fr}}
@media(max-width:560px){.brand-copy{display:none}.lesson-content{padding:22px}.flow{grid-template-columns:1fr}.lesson-actions{flex-direction:column}.footer-row{display:block}}

/* BUILD 1.5.1 IMMERSIVE LEARNING */
.immersive-map{display:grid;grid-template-columns:repeat(9,1fr);gap:7px;align-items:center;margin:22px 0}
.immersive-map .node{background:#0a2035;color:#fff;padding:14px 8px;border-radius:12px;text-align:center;font-size:12px;font-weight:850;min-height:66px;display:grid;place-items:center}
.immersive-map .arr{text-align:center;color:#168fd0;font-size:24px;font-weight:900}
.anatomy-board{background:linear-gradient(135deg,#eef9ff,#f8fcff);border:1px solid #cfe7f3;border-radius:20px;padding:22px;margin:20px 0}
.lungs-art{display:grid;grid-template-columns:1fr 110px 1fr;align-items:center;max-width:650px;margin:20px auto}
.lung{height:210px;background:#dff3fb;border:3px solid #118ac5;position:relative}
.lung.left{border-radius:55% 38% 48% 55%;transform:rotate(3deg)}.lung.right{border-radius:38% 55% 55% 48%;transform:rotate(-3deg)}
.trachea{height:235px;position:relative}.trachea:before{content:"";position:absolute;left:46px;top:0;width:18px;height:95px;background:#bde5f6;border:3px solid #118ac5;border-radius:10px}
.trachea:after{content:"Y";position:absolute;left:28px;top:65px;font-size:82px;font-family:Arial;color:#118ac5;font-weight:700}
.alveolus{background:#fff;border:1px solid #d8e4eb;border-radius:18px;padding:20px;margin:20px 0}
.alveoli-cluster{display:flex;justify-content:center;gap:4px;flex-wrap:wrap;max-width:280px;margin:16px auto}
.alveoli-cluster i{display:block;width:46px;height:46px;border:3px solid #e08c9b;background:#fff0f3;border-radius:50%}
.exchange{display:grid;grid-template-columns:1fr 70px 1fr;gap:12px;align-items:center;margin:20px 0}
.exchange .air,.exchange .blood{padding:20px;border-radius:15px;text-align:center;font-weight:850}.exchange .air{background:#eaf8ff}.exchange .blood{background:#fff0f0}.exchange .mid{text-align:center;font-size:30px}
.study-check{background:#f8fbfd;border:1px solid #dce7ee;border-radius:16px;padding:18px;margin:18px 0}.study-check h3{margin-top:0}
.study-check label{display:block;padding:10px 0;border-bottom:1px solid #e5edf2;color:#40566d}
.study-check input{margin-right:8px}
.media-real{border:1px solid #cfe3ef;background:#f1faff;border-radius:18px;padding:20px;margin:20px 0}.media-real h3{margin-top:0}.media-real a{display:inline-block;text-decoration:none;background:#168fd0;color:#fff;padding:11px 15px;border-radius:10px;font-weight:850}
@media(max-width:800px){.immersive-map{grid-template-columns:1fr}.immersive-map .arr{transform:rotate(90deg)}.exchange{grid-template-columns:1fr}.lungs-art{grid-template-columns:1fr 80px 1fr}.lung{height:160px}}

/* BUILD 1.5.2 REAL MEDIA */
.real-figure{margin:22px 0;background:#fff;border:1px solid #dce7ee;border-radius:18px;padding:18px;box-shadow:0 12px 30px rgba(10,32,53,.06)}
.real-figure img{display:block;max-width:100%;max-height:720px;margin:auto;cursor:zoom-in}
.real-figure figcaption{font-size:12px;color:#64798d;margin-top:12px;text-align:center;line-height:1.5}
.media-gallery{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0}
.media-gallery figure{margin:0}
.video-embed{position:relative;padding-top:56.25%;border-radius:18px;overflow:hidden;background:#000;box-shadow:0 14px 34px rgba(0,0,0,.12);margin:18px 0}
.video-embed iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.source-note{font-size:12px;color:#657a8d;background:#f6f9fb;padding:12px 14px;border-radius:10px}
@media(max-width:760px){.media-gallery{grid-template-columns:1fr}}

/* BUILD 1.5.3 REAL MEDIA — CARDIOVASCULAR */
.cardio-route{display:grid;grid-template-columns:repeat(11,1fr);gap:6px;align-items:center;margin:22px 0}
.cardio-route .node{background:#0a2035;color:#fff;border-radius:12px;padding:13px 7px;text-align:center;font-size:11px;font-weight:850;min-height:64px;display:grid;place-items:center}
.cardio-route .arterial{background:#8c2330}.cardio-route .venous{background:#164d81}.cardio-route .lungnode{background:#167e8e}.cardio-route .arr{text-align:center;font-size:22px;color:#168fd0;font-weight:900}
.photo-pair{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:20px 0}
.real-photo{margin:0;background:#fff;border:1px solid #dce7ee;border-radius:18px;padding:15px;box-shadow:0 12px 30px rgba(10,32,53,.06)}
.real-photo img{display:block;max-width:100%;max-height:520px;margin:auto;cursor:zoom-in}
.real-photo figcaption{font-size:12px;line-height:1.5;color:#64798d;margin-top:10px;text-align:center}
.flow-legend{display:flex;gap:10px;flex-wrap:wrap;margin:12px 0}
.flow-legend span{padding:8px 11px;border-radius:999px;font-size:12px;font-weight:850}.flow-legend .red{background:#fff0f0;color:#8c2330}.flow-legend .blue{background:#edf5ff;color:#164d81}
.oxygen-chain{display:grid;grid-template-columns:repeat(7,1fr);gap:7px;align-items:center;margin:20px 0}.oxygen-chain div{padding:15px 8px;border-radius:12px;text-align:center;font-size:12px;font-weight:850;background:#eef6fa}.oxygen-chain .arr{background:transparent;color:#168fd0;font-size:22px}
.compare-table{width:100%;border-collapse:separate;border-spacing:0;border:1px solid #dce7ee;border-radius:14px;overflow:hidden;margin:18px 0}.compare-table th{background:#0b2136;color:white;padding:12px;text-align:left}.compare-table td{padding:12px;border-top:1px solid #e5edf2;vertical-align:top}.compare-table tr:nth-child(even) td{background:#f7fafc}
@media(max-width:850px){.cardio-route,.oxygen-chain{grid-template-columns:1fr}.cardio-route .arr,.oxygen-chain .arr{transform:rotate(90deg)}.photo-pair{grid-template-columns:1fr}}

/* BUILD 1.5.4 REAL MEDIA — SISTEMA NERVIOSO */
.neuro-route{display:grid;grid-template-columns:repeat(7,1fr);gap:7px;align-items:center;margin:22px 0}
.neuro-route .node{background:#0b2136;color:#fff;padding:16px 8px;border-radius:13px;text-align:center;font-size:12px;font-weight:850;min-height:72px;display:grid;place-items:center}
.neuro-route .arr{text-align:center;color:#168fd0;font-size:26px;font-weight:900}
.neuron-card{background:linear-gradient(135deg,#edf8ff,#fff);border:1px solid #d3e6f0;border-radius:18px;padding:22px;margin:20px 0}
.neuron-line{display:grid;grid-template-columns:1fr 70px 1fr 70px 1.2fr;align-items:center;gap:8px}
.neuron-line div{padding:18px 10px;text-align:center;border-radius:14px;background:#0b2136;color:white;font-weight:850}
.neuron-line .arr{background:transparent;color:#168fd0;font-size:28px}
.neuro-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:18px 0}
.neuro-grid .info-card{height:100%}
@media(max-width:800px){.neuro-route,.neuron-line,.neuro-grid{grid-template-columns:1fr}.neuro-route .arr,.neuron-line .arr{transform:rotate(90deg)}}

/* BUILD 1.5.5 REAL MEDIA — SENTIDOS */
.sense-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:20px 0}.sense-grid .info-card{height:100%}
.orientation-chain{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;align-items:center;margin:20px 0}.orientation-chain div{padding:17px 8px;text-align:center;border-radius:13px;background:#0b2136;color:#fff;font-weight:850}.orientation-chain .arr{background:transparent;color:#168fd0;font-size:28px}
@media(max-width:800px){.sense-grid,.orientation-chain{grid-template-columns:1fr}.orientation-chain .arr{transform:rotate(90deg)}}

/* BUILD 1.7.1 ABCDE REAL MEDIA */
.abcde-cards{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:20px 0}
.abcde-cards article{border-radius:16px;padding:18px 12px;background:#f4f8fb;border:1px solid #dce7ee}
.abcde-cards b{display:block;font-size:34px;color:#0b2136}.abcde-cards small{font-weight:800;color:#168fd0}
.priority-box{background:#0b2136;color:#fff;border-radius:18px;padding:22px;margin:20px 0}.priority-box h3{color:#fff;margin-top:0}.priority-box p{color:#d7e7f0}
@media(max-width:850px){.abcde-cards{grid-template-columns:1fr}}

/* =========================================================
   BUILD 1.8 — REDISEÑO CAMPUS PREMIUM
   Añade el diseño completo que faltaba en la portada/área.
   ========================================================= */
body{background:#eef3f8}
.topbar{background:linear-gradient(90deg,#061728,#082844);min-height:76px}
.brand{min-height:76px}
.brand-mark{font-size:30px}
.build{background:rgba(19,126,215,.12);box-shadow:inset 0 0 0 1px rgba(99,198,255,.15)}
.hero,.subhero{
  position:relative;overflow:hidden;color:#fff;
  background:
    radial-gradient(circle at 78% 24%,rgba(48,174,255,.26),transparent 25%),
    radial-gradient(circle at 93% 78%,rgba(43,211,183,.10),transparent 20%),
    linear-gradient(135deg,#061522 0%,#0a2b48 62%,#0b3656 100%);
}
.hero:after,.subhero:after{
  content:"";position:absolute;right:-80px;top:-100px;width:420px;height:420px;border:1px solid rgba(99,201,255,.13);
  border-radius:50%;box-shadow:0 0 0 70px rgba(99,201,255,.025),0 0 0 140px rgba(99,201,255,.018)
}
.hero.compact{padding:64px 0}
.hero-grid{position:relative;z-index:1;display:grid;grid-template-columns:minmax(0,1.5fr) minmax(320px,.7fr);gap:42px;align-items:center}
.eyebrow{font-size:11px;letter-spacing:1.7px;font-weight:950;color:#68d1ff;margin-bottom:10px}
.eyebrow.dark{color:#1688c5}
.hero h1,.subhero h1{font-size:clamp(46px,5.5vw,76px);max-width:900px}
.hero .lead,.subhero .lead{max-width:760px;color:#c6daea}
.notice{
  display:inline-flex;align-items:center;gap:9px;margin-top:24px;padding:12px 15px;border-radius:12px;
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.13);color:#dceaf4;font-size:13px
}
.notice:before{content:"✓";display:grid;place-items:center;width:24px;height:24px;border-radius:50%;background:#1aa5e8;color:white;font-weight:950}
.command-card{
  position:relative;z-index:2;background:linear-gradient(160deg,rgba(19,58,90,.96),rgba(8,33,54,.96));
  border:1px solid rgba(132,210,255,.22);box-shadow:0 25px 65px rgba(0,0,0,.23);
  border-radius:24px;padding:28px;color:#fff
}
.command-card .symbol-row{display:flex;gap:14px;margin-bottom:22px}
.command-card .symbol-row span{width:58px;height:58px;border-radius:18px;display:grid;place-items:center;background:rgba(52,177,247,.12);font-size:28px;border:1px solid rgba(95,200,255,.18)}
.command-card h3{font-size:25px;margin:0 0 8px}.command-card p{color:#aec6d8;line-height:1.65;margin:0}
.section{padding:62px 0;background:#f4f7fa}.section.alt{background:#edf3f7}
.section-head{display:flex;justify-content:space-between;gap:35px;align-items:end;margin-bottom:28px}
.section-head h2{font-size:36px;letter-spacing:-1.3px;margin:6px 0 0}.section-head>p{max-width:500px;color:#667a8d;line-height:1.65;margin:0}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.area-card{
  position:relative;overflow:hidden;background:#fff;border:1px solid #dce7ef;border-radius:22px;padding:25px;
  box-shadow:0 16px 38px rgba(20,49,75,.07);transition:.2s transform,.2s box-shadow
}
.area-card:hover{transform:translateY(-4px);box-shadow:0 24px 55px rgba(20,49,75,.12)}
.area-card:before{content:"";position:absolute;left:0;top:0;right:0;height:5px;background:#1b9fe2}
.area-card.sea:before{background:#168cc0}.area-card.land:before{background:#39ad72}
.area-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:17px}
.area-icon{width:58px;height:58px;border-radius:17px;display:grid;place-items:center;font-size:29px;background:#e9f7ff}
.badge{font-size:10px;letter-spacing:.6px;font-weight:950;padding:7px 9px;border-radius:999px;background:#eef3f7;color:#76889a}
.badge.active{background:#e8f9f1;color:#168956}
.area-card h3{font-size:22px;margin:5px 0 9px}.area-card .subtitle{color:#5d7184;line-height:1.6;min-height:52px}
.area-card ul{padding-left:19px;color:#53687b;line-height:1.8;font-size:14px}
.card-link{display:inline-flex;margin-top:13px;text-decoration:none;font-weight:850}.card-link.strong{background:#127ed8;color:#fff;border-radius:11px;padding:11px 15px}.card-link.muted{color:#8192a1}
.subhero{padding:48px 0 42px}.subhero .wrap{position:relative;z-index:2}
.progress-box{margin-top:28px;max-width:640px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);padding:15px 17px;border-radius:15px}
.progress-box>div:first-child{display:flex;gap:13px;align-items:baseline}.progress-box b{font-size:22px}.progress-box span{font-size:12px;color:#bfd2e1}
.progress{height:8px;background:rgba(255,255,255,.13);border-radius:999px;overflow:hidden;margin-top:11px}.progress i{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,#23b5ff,#26d2a1)}
.module-list{display:grid;gap:12px}
.module-row{
  display:grid;grid-template-columns:72px minmax(0,1fr) 100px 130px;gap:16px;align-items:center;
  background:#fff;border:1px solid #dce6ee;border-radius:17px;padding:17px 18px;box-shadow:0 8px 25px rgba(25,56,82,.04)
}
.module-row.open{border-color:#b8def2;box-shadow:0 10px 28px rgba(19,126,215,.08)}
.module-num{width:52px;height:52px;border-radius:15px;display:grid;place-items:center;background:#edf5fb;color:#177eb6;font-weight:950;font-size:18px}
.module-row.open .module-num{background:#117fd1;color:#fff}
.module-copy h3{font-size:17px;margin:0 0 4px}.module-copy p{font-size:13px;color:#6b7e90;margin:0;line-height:1.5}
.module-status{font-size:10px;font-weight:950;letter-spacing:.6px;color:#728496}.module-row.open .module-status{color:#158d5c}
.module-button{text-align:center;text-decoration:none;padding:10px 12px;border-radius:10px;background:#117fd1;color:white;font-size:12px;font-weight:900}
.module-button.disabled{background:#eef2f5;color:#9aa8b3}
.lesson-shell{background:#eef3f8}
.lesson-content{border:1px solid #e1e8ee}
.lesson-nav{background:linear-gradient(180deg,#071d31,#0a3150);box-shadow:0 18px 45px rgba(5,26,44,.20)}
.lesson-nav a{transition:.15s}.lesson-nav a:hover{padding-left:5px;color:#5fd0ff}
.lesson-block h2{color:#0b2038}
.info-card{box-shadow:0 8px 22px rgba(18,48,75,.035)}
.next{display:inline-flex!important;align-items:center;justify-content:center;text-decoration:none!important;background:#127ed8!important;color:#fff!important;padding:10px 14px!important;border-radius:10px!important;font-weight:850!important}
@media(max-width:980px){
 .hero-grid,.cards{grid-template-columns:1fr}.section-head{align-items:start;flex-direction:column}
 .module-row{grid-template-columns:60px 1fr}.module-status,.module-button{grid-column:2}
}
@media(max-width:600px){
 .hero.compact{padding:42px 0}.command-card{padding:20px}.cards{gap:14px}
 .module-row{grid-template-columns:1fr}.module-num,.module-status,.module-button{grid-column:auto}.module-button{text-align:left}
}

/* BUILD 1.9 — MÓDULO 04 REAL MEDIA COMPLETO */
.memory-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:20px 0}
.memory-strip .memory-item{background:#0b2136;color:#fff;border-radius:16px;padding:17px;text-align:center}
.memory-strip .memory-item b{display:block;font-size:13px;color:#5dccff;margin-bottom:5px}
.vitals-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:13px;margin:20px 0}
.vitals-grid .info-card{height:100%}
.report-box{background:linear-gradient(135deg,#0b2136,#123f63);border-radius:20px;padding:24px;color:#fff;margin:20px 0}
.report-box h3{color:#fff;margin-top:0}.report-box p{color:#d9e7f1}
@media(max-width:800px){.memory-strip,.vitals-grid{grid-template-columns:1fr}}

/* BUILD 2.0 — DEEP REAL MEDIA */
.source-gallery{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px;margin:24px 0}
.source-page{margin:0;background:white;border:1px solid #dce7ef;border-radius:18px;padding:12px;box-shadow:0 12px 28px rgba(20,49,75,.07)}
.source-page img{width:100%;display:block;border-radius:10px}
.source-page figcaption{font-size:12px;color:#65798b;padding:10px 5px 3px}
.deep-intro{font-size:18px;line-height:1.8;color:#334c62}
.source-note{background:#fff8e8;border-left:5px solid #e7a623;border-radius:12px;padding:18px 20px;margin:22px 0}
@media(max-width:800px){.source-gallery{grid-template-columns:1fr}}

/* BUILD 2.3 — ÁREA MARÍTIMA */
.sea-hero{background:
 radial-gradient(circle at 78% 20%,rgba(49,195,224,.24),transparent 26%),
 linear-gradient(135deg,#041827 0%,#073d59 62%,#075d72 100%)}
.sea-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.sea-module{background:#fff;border:1px solid #d7e6ed;border-radius:20px;padding:24px;box-shadow:0 14px 35px rgba(15,55,75,.07)}
.sea-module .num{display:grid;place-items:center;width:52px;height:52px;border-radius:15px;background:#087fa1;color:#fff;font-size:19px;font-weight:950;margin-bottom:16px}
.sea-module h3{margin:0 0 8px}.sea-module p{color:#5d7282;line-height:1.65}
.sea-module ul{color:#536b7b;line-height:1.8}
.sea-module.locked{opacity:.72}.sea-module.locked .num{background:#9aabb4}
.maritime-diagram{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:24px 0}
.maritime-diagram div{background:#eaf7fb;border:1px solid #cce7ef;border-radius:16px;padding:18px;text-align:center}
.maritime-diagram b{display:block;color:#087fa1;margin-bottom:6px}
@media(max-width:850px){.sea-grid,.maritime-diagram{grid-template-columns:1fr}}

/* BUILD 2.3.1 — M01 MARÍTIMO DEEP REAL MEDIA */
.deep-intro{font-size:18px;line-height:1.85;color:#344d5d}
.media-gallery{display:grid;grid-template-columns:1.15fr .85fr;gap:18px;margin:24px 0}
.media-photo{min-height:300px;border-radius:22px;overflow:hidden;position:relative;background:#073d59}
.media-photo img{width:100%;height:100%;object-fit:cover;display:block}
.media-photo .caption{position:absolute;left:0;right:0;bottom:0;padding:18px 20px;background:linear-gradient(transparent,rgba(0,18,30,.92));color:#fff}
.visual-sea{border-radius:22px;padding:28px;background:linear-gradient(145deg,#062b40,#087c98);color:#fff;display:flex;flex-direction:column;justify-content:center}
.visual-sea .big{font-size:54px}.visual-sea h3{font-size:24px;margin:10px 0}
.visual-sea p{line-height:1.7;color:#d9f5fb}
.risk-table{width:100%;border-collapse:separate;border-spacing:0;margin:22px 0;overflow:hidden;border:1px solid #d5e4eb;border-radius:16px}
.risk-table th,.risk-table td{padding:15px;text-align:left;border-bottom:1px solid #e3edf1;vertical-align:top}
.risk-table th{background:#eaf7fb}.risk-table tr:last-child td{border-bottom:0}
.video-panel{background:#061b29;color:#fff;border-radius:22px;padding:28px;margin:26px 0}
.video-panel h3{font-size:24px;margin:0 0 8px}.video-panel p{color:#c7e4ee;line-height:1.7}
.video-links{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:18px}
.video-link{display:block;padding:17px;border-radius:14px;background:#0b3850;color:#fff!important;text-decoration:none;border:1px solid #17627d}
.video-link strong{display:block;margin-bottom:4px}.video-link span{font-size:13px;color:#aeeaff}
.sequence{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:22px 0}
.sequence div{padding:18px 12px;border-radius:15px;background:#eef8fb;text-align:center;border-top:4px solid #0997bd}
.sequence b{display:block;color:#067694;margin-bottom:6px}
.source-note{font-size:13px;color:#607786;border-left:3px solid #12a6cf;padding-left:12px;margin:16px 0}
@media(max-width:850px){.media-gallery,.video-links{grid-template-columns:1fr}.sequence{grid-template-columns:1fr 1fr}}

/* BUILD 2.3.2 — MÓDULO MARÍTIMO 02 · DEEP */
.rescue-chain{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:22px 0}
.rescue-chain div{padding:18px 12px;border-radius:15px;background:#eaf7fb;border-top:4px solid #0789a9;text-align:center}
.rescue-chain b{display:block;color:#06758f;margin-bottom:5px}
.danger-panel{background:linear-gradient(135deg,#431c25,#762c38);color:white;border-radius:20px;padding:24px;margin:24px 0}
.danger-panel h3{color:white;margin-top:0}.danger-panel p{color:#ffe7e9}
.scenario-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px;margin:20px 0}
@media(max-width:800px){.rescue-chain,.scenario-grid{grid-template-columns:1fr}}

/* BUILD 2.3.3 — MÓDULO MARÍTIMO 03 · EXPOSICIÓN Y LESIONES */
.thermal-chain{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin:22px 0}
.thermal-chain div{padding:19px;border-radius:16px;background:#edf7fb;border:1px solid #d2e8f0;text-align:center}
.thermal-chain b{display:block;color:#087c9b;margin-bottom:6px}
.symptom-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:20px 0}
.symptom-grid .info-card{height:100%}
.environment-box{background:linear-gradient(135deg,#072f46,#0a6680);color:#fff;border-radius:22px;padding:26px;margin:24px 0}
.environment-box h3{color:#fff}.environment-box p{color:#d9f4fb;line-height:1.75}
@media(max-width:850px){.thermal-chain,.symptom-grid{grid-template-columns:1fr}}

/* BUILD 2.3.4 — MÓDULO MARÍTIMO 04 · ASISTENCIA, COMUNICACIONES Y EVACUACIÓN */
.comms-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:22px 0}
.comms-grid .info-card{height:100%}
.evac-chain{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:22px 0}
.evac-chain div{padding:18px 11px;border-radius:15px;background:#eaf7fb;border-top:4px solid #0788a8;text-align:center}
.evac-chain b{display:block;color:#06748f;margin-bottom:5px}
.radio-box{background:linear-gradient(135deg,#071e31,#0b4b67);color:#fff;border-radius:22px;padding:27px;margin:24px 0}
.radio-box h3{color:#fff;margin-top:0}.radio-box p{color:#d7edf5;line-height:1.75}
.icao-preview{display:grid;grid-template-columns:repeat(6,1fr);gap:8px;margin:18px 0}
.icao-preview div{background:#fff;color:#0b3850;border-radius:10px;padding:11px 6px;text-align:center;font-size:12px}
.icao-preview b{display:block;font-size:17px;color:#0785a5}
.transfer-card{background:#f5fafc;border:1px solid #d5e8ef;border-radius:18px;padding:22px;margin:20px 0}
@media(max-width:850px){.comms-grid,.evac-chain{grid-template-columns:1fr}.icao-preview{grid-template-columns:repeat(3,1fr)}}

/* 2.3.5 */
.icao-full{display:grid;grid-template-columns:repeat(6,minmax(95px,1fr));gap:10px;margin:20px 0}
.icao-full div{background:#f2f9fc;border:1px solid #d4eaf2;border-radius:13px;padding:13px 8px;text-align:center}
.icao-full b{display:block;font-size:19px;color:#0583a5}.icao-full span{font-size:12px}
.sar-gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:24px 0}
.sar-photo{min-height:220px;border-radius:18px;overflow:hidden;position:relative;background:#092c40}
.sar-photo img{width:100%;height:220px;object-fit:cover;display:block}
.sar-photo p{margin:0;padding:12px 14px;background:#092c40;color:#fff;font-size:13px}
.media-buttons{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
@media(max-width:850px){.icao-full{grid-template-columns:repeat(3,1fr)}.sar-gallery,.media-buttons{grid-template-columns:1fr}}

/* BUILD 2.3.6 — VHF MARÍTIMO */
.vhf-console{background:#071b29;color:#fff;border-radius:24px;padding:26px;margin:24px 0}
.vhf-display{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.channel-card{background:#0d3448;border:1px solid #1b627d;border-radius:18px;padding:20px}
.channel-card .ch{font-size:42px;font-weight:950;color:#72dcff;line-height:1}
.channel-card h3{color:#fff;margin:8px 0}.channel-card p{color:#d6edf5;line-height:1.6}
.channel-card.warn{border-color:#e4bb5a}.channel-card.warn .ch{color:#ffd76d}
.channel-card.work{border-color:#8ab4c3}.channel-card.work .ch{color:#b9dbe7}
.radio-script{background:#f0f8fb;border-left:5px solid #0794ba;border-radius:15px;padding:20px;margin:18px 0;line-height:1.8}
.distress-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:20px 0}
.distress-grid article{border-radius:18px;padding:20px;border:1px solid #d5e7ed;background:#fff}
.distress-grid h3{margin-top:0}
.vhf-steps{counter-reset:vhf;display:grid;gap:12px;margin:20px 0}
.vhf-steps div{counter-increment:vhf;background:#f4fafc;border-radius:14px;padding:16px 18px 16px 62px;position:relative}
.vhf-steps div:before{content:counter(vhf);position:absolute;left:17px;top:13px;width:32px;height:32px;border-radius:50%;background:#078aaa;color:#fff;display:grid;place-items:center;font-weight:900}
@media(max-width:850px){.vhf-display,.distress-grid{grid-template-columns:1fr}}