/* ==========================================================================
   CONCRETO — Apps de cálculo estructural
   Tema oscuro, tipo software de ingeniería profesional
   ========================================================================== */

:root{
  --bg:#0A0E13;
  --bg-panel:#10161F;
  --bg-panel-2:#151C27;
  --ink:#EDEFF2;
  --ink-soft:#98A3AC;
  --line:#232B35;

  --blue:#3E7BFA;
  --blue-deep:#0F2B54;
  --green:#4ED03A;
  --green-deep:#0F2E13;
  --orange:#32C7E8;
  --orange-deep:#0B3040;

  --concrete:#6B7680;
  --white:#FFFFFF;
  --radius:3px;
  --shadow-hard:5px 5px 0 rgba(0,0,0,0.6);
}

*{box-sizing:border-box;margin:0;padding:0;}
html{scroll-behavior:smooth;}
body{
  background:var(--bg);
  color:var(--ink);
  font-family:'Inter',sans-serif;
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,.font-display{font-family:'Space Grotesk',sans-serif;}
.font-mono{font-family:'JetBrains Mono',monospace;}
a{color:inherit;text-decoration:none;}
img{max-width:100%;display:block;}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px;}
section{padding:88px 0;border-top:1px solid var(--line);}

::selection{background:var(--blue);color:var(--white);}

a:focus-visible,button:focus-visible{
  outline:2px solid var(--blue);
  outline-offset:3px;
}

/* ---------------------------------- NAV ---------------------------------- */
header{
  position:sticky;top:0;z-index:60;
  background:rgba(10,14,19,0.92);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
nav{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 24px;max-width:1120px;margin:0 auto;gap:16px;
}
.brand-group{display:flex;align-items:center;gap:12px;}
.logo-slot{
  width:38px;height:38px;border-radius:var(--radius);
  flex-shrink:0;object-fit:contain;
}
.logo-slot.empty{
  border:1.5px dashed var(--concrete);
  background:var(--bg-panel);
  position:relative;
}
.logo-slot.empty::after{
  content:'+ LOGO';
  position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  color:var(--concrete);font-size:0.5rem;font-family:'JetBrains Mono',monospace;text-align:center;line-height:1.1;
}
.brand{font-weight:700;font-size:1.15rem;letter-spacing:0.01em;color:var(--ink);}
.brand .accent{color:var(--blue);}

.navlinks{display:none;gap:26px;font-size:0.88rem;font-weight:500;color:var(--ink-soft);}
.navlinks a{position:relative;padding-bottom:3px;}
.navlinks a::after{
  content:'';position:absolute;left:0;bottom:0;width:0;height:1.5px;background:var(--blue);
  transition:width .18s ease;
}
.navlinks a:hover,.navlinks a.active{color:var(--ink);}
.navlinks a:hover::after,.navlinks a.active::after{width:100%;}
@media(min-width:800px){.navlinks{display:flex;}}

.nav-cta{padding:9px 16px;font-size:0.83rem;}

.menu-toggle{
  display:flex;background:none;border:1px solid var(--line);border-radius:var(--radius);
  padding:8px 10px;cursor:pointer;
}
@media(min-width:800px){.menu-toggle{display:none;}}
.menu-toggle span{display:block;width:18px;height:1.5px;background:var(--ink);margin:3px 0;}

.mobile-menu{
  display:none;flex-direction:column;gap:2px;padding:8px 24px 18px;
  border-bottom:1px solid var(--line);
}
.mobile-menu.open{display:flex;}
.mobile-menu a{padding:10px 0;font-size:0.95rem;font-weight:500;border-bottom:1px solid var(--line);color:var(--ink-soft);}
.mobile-menu .mobile-whatsapp{color:#22C35E;font-weight:700;}
@media(min-width:800px){.mobile-menu{display:none !important;}}

/* ---------------------------------- BUTTONS ---------------------------------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 22px;font-weight:600;font-size:0.92rem;
  border-radius:var(--radius);border:1.5px solid var(--ink);
  transition:transform .12s ease, background .12s ease, box-shadow .12s ease;
  cursor:pointer;background:none;color:var(--ink);
}
.btn:hover{transform:translate(-2px,-2px);box-shadow:3px 3px 0 rgba(0,0,0,0.5);}
.btn-primary{background:var(--blue);border-color:var(--blue);color:var(--white);}
.btn-primary:hover{box-shadow:3px 3px 0 rgba(0,0,0,0.6);}
.btn-ghost{background:var(--bg-panel);border-color:var(--line);}
.btn-ghost:hover{background:var(--bg-panel-2);}
.btn-whatsapp{background:#22C35E;border-color:#22C35E;color:var(--white);}

/* ---------------------------------- HERO ---------------------------------- */
.hero{
  padding:80px 0 70px;position:relative;overflow:hidden;border-top:none;
  background:
    radial-gradient(circle at 85% 15%, rgba(62,123,250,0.16), transparent 55%),
    var(--bg);
}
.hero::before{
  content:'';position:absolute;inset:0;opacity:0.5;pointer-events:none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:48px 48px;
  mask-image:linear-gradient(to bottom, black, transparent 85%);
}
.hero-grid{display:grid;grid-template-columns:1fr;gap:52px;align-items:center;position:relative;z-index:2;}
@media(min-width:900px){.hero-grid{grid-template-columns:1.05fr 0.95fr;}}

.eyebrow{
  font-family:'JetBrains Mono',monospace;font-size:0.74rem;color:var(--blue);
  letter-spacing:0.09em;text-transform:uppercase;margin-bottom:18px;
  display:flex;align-items:center;gap:10px;
}
.eyebrow::before{content:'';width:24px;height:1px;background:var(--blue);display:inline-block;}

.hero h1{
  font-size:2.5rem;line-height:1.08;font-weight:700;letter-spacing:-0.01em;margin-bottom:20px;color:var(--ink);
}
@media(min-width:600px){.hero h1{font-size:3.15rem;}}
.hero h1 em{font-style:normal;color:var(--blue);}
.hero p.lede{font-size:1.08rem;color:var(--ink-soft);max-width:48ch;margin-bottom:32px;}
.cta-row{display:flex;flex-wrap:wrap;gap:14px;}

.blueprint{
  background:var(--blue-deep);
  border-radius:var(--radius);
  padding:22px;
  position:relative;
  border:1px solid #1E3E66;
  box-shadow:0 20px 60px rgba(0,0,0,0.5);
}
.blueprint svg,.blueprint video.hero-video{width:100%;height:auto;display:block;border-radius:2px;background:#000;}
.blueprint .cap{
  font-family:'JetBrains Mono',monospace;color:#9FB6C0;font-size:0.68rem;
  display:flex;justify-content:space-between;margin-top:14px;letter-spacing:0.03em;
  border-top:1px solid #1E3E66;padding-top:10px;
}

/* -------------------------- TECHNICAL AUTHORITY ------------------------- */
.founder{background:linear-gradient(180deg,var(--bg-panel) 0%,var(--bg) 100%);}
.founder-grid{display:grid;grid-template-columns:minmax(260px,.78fr) minmax(0,1.1fr);gap:74px;align-items:center;}
.founder-photo{position:relative;max-width:390px;justify-self:start;background:var(--bg-panel-2);border:1px solid var(--line);box-shadow:var(--shadow-hard);overflow:hidden;}
.founder-photo::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,transparent 48%,rgba(4,8,12,.84));pointer-events:none;}
.founder-photo img{width:100%;aspect-ratio:4/5;object-fit:cover;object-position:center 36%;filter:saturate(.86) contrast(1.06);}
.founder-photo figcaption{position:absolute;z-index:1;left:16px;right:16px;bottom:13px;display:flex;justify-content:space-between;gap:10px;color:#fff;font:500 .6rem 'JetBrains Mono',monospace;letter-spacing:.06em;}
.founder-copy{max-width:610px;}
.founder-copy h2{font-size:2.25rem;line-height:1.08;letter-spacing:-.02em;margin-bottom:17px;}
.founder-copy h2 span{color:var(--blue);}
.founder-copy>p{max-width:55ch;color:var(--ink-soft);font-size:1rem;}
.founder-points{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:30px;}
.founder-points div{border-top:1px solid var(--line);padding-top:12px;}
.founder-points strong,.founder-points span{display:block;}
.founder-points strong{font:600 .77rem 'JetBrains Mono',monospace;color:var(--ink);letter-spacing:.035em;}
.founder-points span{margin-top:4px;color:var(--ink-soft);font-size:.78rem;line-height:1.42;}
.founder-cta{display:inline-flex;margin-top:26px;}
@media(max-width:760px){
  .founder-grid{grid-template-columns:1fr;gap:32px;}
  .founder-photo{max-width:520px;width:100%;}
}

/* ---------------------------------- SECTION HEADS ---------------------------------- */
.section-head{margin-bottom:48px;max-width:62ch;}
.section-num{font-family:'JetBrains Mono',monospace;color:var(--blue);font-size:0.78rem;letter-spacing:0.09em;margin-bottom:10px;}
.section-head h2{font-size:1.9rem;font-weight:700;letter-spacing:-0.01em;margin-bottom:12px;color:var(--ink);}
.section-head p{color:var(--ink-soft);font-size:1.02rem;}

/* ---------------------------------- APP CARDS ---------------------------------- */
.cards{display:grid;grid-template-columns:1fr;gap:20px;}
@media(min-width:760px){.cards{grid-template-columns:repeat(3,1fr);}}
.card{
  background:var(--bg-panel);border:1.5px solid var(--line);border-radius:var(--radius);
  padding:0;display:flex;flex-direction:column;overflow:hidden;
  transition:transform .16s ease, box-shadow .16s ease, border-color .16s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hard);border-color:var(--blue);}
.card-art{
  position:relative;aspect-ratio:16/10;display:flex;align-items:center;justify-content:center;
  border-bottom:1.5px solid var(--line);
}
.card-art img{display:block;width:100%;height:100%;object-fit:cover;object-position:center;transition:transform .28s ease,filter .28s ease;}
.card-art::after{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(4,10,18,.1),rgba(4,10,18,.38));pointer-events:none;}
.card:hover .card-art img{transform:scale(1.035);filter:brightness(1.08);}
.card-art.blue{background:radial-gradient(circle at 30% 20%, rgba(62,123,250,0.25), var(--blue-deep));}
.card-art.green{background:radial-gradient(circle at 30% 20%, rgba(78,208,58,0.22), var(--green-deep));}
.card-art.orange{background:radial-gradient(circle at 30% 20%, rgba(50,199,232,0.25), var(--orange-deep));}
.card-body{padding:22px;display:flex;flex-direction:column;gap:12px;flex-grow:1;}
.card h3{font-size:1.12rem;font-weight:700;color:var(--ink);}
.card .desc{color:var(--ink-soft);font-size:0.92rem;flex-grow:1;}
.card .go{font-size:0.85rem;font-weight:600;color:var(--blue);display:flex;align-items:center;gap:6px;}
.card .go .arrow{transition:transform .15s;}
.card:hover .go .arrow{transform:translateX(3px);}

/* ---------------------------------- APP HERO BAND (portada por app) ---------------------------------- */
.app-hero{
  position:relative;overflow:hidden;
  padding:72px 24px;
  border-bottom:1px solid var(--line);
}
.app-hero::before{
  content:'';position:absolute;inset:0;opacity:0.45;pointer-events:none;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size:44px 44px;
}
.app-hero-inner{max-width:1120px;margin:0 auto;position:relative;z-index:2;}
.app-hero .app-status{margin-bottom:16px;display:inline-block;}
.app-hero h2{font-size:2.6rem;font-weight:700;color:var(--white);letter-spacing:-0.01em;text-shadow:0 2px 12px rgba(0,0,0,0.6);}
@media(min-width:700px){.app-hero h2{font-size:3.4rem;}}
.app-hero .app-hero-sub{color:rgba(255,255,255,0.72);max-width:62ch;margin-top:14px;font-size:1.02rem;}

.app-hero--blue{
  background-image:linear-gradient(rgba(10,14,19,0.4), rgba(10,14,19,0.7)), url('Fotos/BannerPrediseno.jpg');
  background-size:cover;
  background-position:center;
}
.app-hero--blue .app-status{color:var(--blue);border-color:var(--blue);}
.app-hero--blue h2 .hl{color:var(--blue);}

.app-hero--green{
  background-image:linear-gradient(rgba(10,14,19,0.4), rgba(10,14,19,0.7)), url('Fotos/BannerCalculadora.jpg');
  background-size:cover;
  background-position:center;
}
.app-hero--green .app-status{color:var(--green);border-color:var(--green);}
.app-hero--green h2 .hl{color:var(--green);}

.app-hero--orange{
  background-image:linear-gradient(rgba(10,14,19,0.4), rgba(10,14,19,0.7)), url('Fotos/BannerMuros.jpg');
  background-size:cover;
  background-position:center;
}
.app-hero--orange .app-status{color:var(--orange);border-color:var(--orange);}
.app-hero--orange h2 .hl{color:var(--orange);}

/* ---------------------------------- APP DETAIL BODY ---------------------------------- */
.app-detail{scroll-margin-top:64px;border-top:none;padding-top:0;}
.app-body{padding:64px 0;}
.app-status{
  font-family:'JetBrains Mono',monospace;font-size:0.7rem;
  border:1px solid var(--line);padding:3px 9px;border-radius:var(--radius);letter-spacing:0.04em;
}
.app-sub{color:var(--ink-soft);margin-bottom:38px;max-width:62ch;}
.app-grid{display:grid;grid-template-columns:1fr;gap:38px;align-items:start;}
@media(min-width:900px){.app-grid{grid-template-columns:1fr 1fr;}}
.app-grid.reverse .app-visual{order:2;}
@media(max-width:899px){.app-grid.reverse .app-visual{order:0;}}

.feature-list{list-style:none;display:flex;flex-direction:column;gap:18px;}
.feature-list li{display:flex;gap:16px;align-items:flex-start;}
.feature-list .dim{font-size:0.78rem;flex-shrink:0;width:26px;padding-top:2px;font-family:'JetBrains Mono',monospace;}
.feature-list strong{display:block;font-size:0.98rem;margin-bottom:3px;color:var(--ink);}
.feature-list span{color:var(--ink-soft);font-size:0.9rem;}

.diagram-panel{
  border-radius:var(--radius);padding:20px;border:1px solid var(--line);
  background:var(--bg-panel);
}
.diagram-panel svg,.diagram-panel .diagram-img{width:100%;height:auto;display:block;border-radius:2px;}
.diagram-panel .cap{
  font-family:'JetBrains Mono',monospace;color:var(--ink-soft);font-size:0.66rem;
  display:flex;justify-content:space-between;margin-top:12px;border-top:1px solid var(--line);padding-top:9px;
}

.video-slot{
  background:var(--bg-panel);border:1px solid var(--line);border-radius:var(--radius);aspect-ratio:16/9;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;color:var(--ink-soft);
  margin-top:18px;position:relative;overflow:hidden;
}
.video-slot .play{
  width:52px;height:52px;border-radius:50%;border:1.5px solid var(--ink-soft);
  display:flex;align-items:center;justify-content:center;font-size:1rem;color:var(--ink);
}
.video-slot .label{font-family:'JetBrains Mono',monospace;font-size:0.7rem;letter-spacing:0.05em;color:var(--concrete);}

.video-embed{
  position:relative;
  width:100%;
  aspect-ratio:16/9;
  border-radius:var(--radius);
  overflow:hidden;
  border:1px solid var(--line);
  margin-top:18px;
  background:#000;
}
.video-embed iframe{
  position:absolute;
  top:0;left:0;
  width:100%;
  height:100%;
  border:0;
}
.tutorial-callout{margin-top:18px;min-height:96px;padding:8px;display:flex;align-items:center;gap:13px;border:1px solid var(--line);background:var(--bg-panel);transition:transform .18s ease,background .18s ease,border-color .18s ease,box-shadow .18s ease;}
.tutorial-callout:hover{background:var(--bg-panel-2);border-color:var(--blue);transform:translateY(-2px);box-shadow:var(--shadow-hard);}
.tutorial-preview{position:relative;display:block;width:116px;height:78px;flex:none;overflow:hidden;border:1px solid rgba(255,255,255,.16);background:#07101c;}
.tutorial-preview::after{content:'';position:absolute;inset:0;background:linear-gradient(90deg,rgba(4,9,16,.26),rgba(4,9,16,.03) 65%,rgba(4,9,16,.3));pointer-events:none;}
.tutorial-preview img{display:block;width:100%;height:100%;object-fit:cover;object-position:center;transition:transform .28s ease;}
.tutorial-callout:hover .tutorial-preview img{transform:scale(1.06);}
.tutorial-preview-play{position:absolute;z-index:1;left:9px;bottom:8px;width:25px;height:25px;display:grid;place-items:center;padding-left:1px;border:1px solid rgba(255,255,255,.8);border-radius:50%;background:rgba(5,12,22,.72);color:#fff;font-size:.62rem;line-height:1;}
.tutorial-copy{min-width:0;display:block;}
.tutorial-kicker{display:block;margin-bottom:4px;color:var(--blue);font:500 .59rem 'JetBrains Mono',monospace;letter-spacing:.055em;}
.tutorial-callout strong,.tutorial-callout small{display:block;}
.tutorial-callout strong{font-size:.86rem;}
.tutorial-callout small{font-size:.74rem;color:var(--ink-soft);margin-top:2px;}
.tutorial-arrow{margin-left:auto;color:var(--blue);font-size:1.1rem;}

.app-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px;}

.app-detail--blue .feature-list .dim{color:var(--blue);}
.app-detail--blue .app-cta .btn-primary{background:var(--blue);border-color:var(--blue);}
.app-detail--green .feature-list .dim{color:var(--green);}
.app-detail--green .app-cta .btn-primary{background:var(--green);border-color:var(--green);color:#0A140A;}
.app-detail--orange .feature-list .dim{color:var(--orange);}
.app-detail--orange .app-cta .btn-primary{background:var(--orange);border-color:var(--orange);color:#06212B;}

/* ---------------------------------- STATS ---------------------------------- */
.stats{display:grid;grid-template-columns:repeat(2,1fr);gap:28px;}
@media(min-width:700px){.stats{grid-template-columns:repeat(4,1fr);}}
.stat{border-left:2px solid var(--blue);padding-left:14px;}
.stat .num{font-family:'JetBrains Mono',monospace;font-size:2rem;font-weight:600;color:var(--ink);}
.stat .lbl{font-size:0.85rem;color:var(--ink-soft);margin-top:4px;}

/* ---------------------------------- CONTACT ---------------------------------- */
.contact-box{
  background:radial-gradient(circle at 85% 15%, rgba(34,195,94,0.18), transparent 55%), var(--bg-panel);
  border:1px solid var(--line);
  color:var(--ink);border-radius:var(--radius);
  padding:52px 44px;display:flex;flex-direction:column;gap:20px;align-items:flex-start;
  position:relative;overflow:hidden;
}
.contact-box h2{font-size:1.85rem;color:var(--ink);}
.contact-box p{color:var(--ink-soft);max-width:58ch;}
.contact-num{color:var(--orange);}
.steps{display:flex;flex-direction:column;gap:11px;margin:8px 0;}
.steps .step{display:flex;gap:12px;align-items:baseline;font-size:0.93rem;color:var(--ink-soft);}
.steps .dim{color:#22C35E;font-family:'JetBrains Mono',monospace;}

/* ---------------------------------- FOOTER ---------------------------------- */
footer{border-top:1px solid var(--line);padding:34px 0;font-size:0.85rem;color:var(--ink-soft);}
.foot-row{display:flex;flex-wrap:wrap;justify-content:space-between;gap:12px;}

/* -------------------------------- RECURSOS -------------------------------- */
.resources-section{background:linear-gradient(180deg, var(--bg), #0D131C);}
.resources-head{margin-bottom:28px;}
.resource-toolbar,.video-toolbar{display:flex;gap:9px;overflow-x:auto;padding:2px 0 10px;margin-bottom:24px;scrollbar-width:none;}
.resource-toolbar::-webkit-scrollbar,.video-toolbar::-webkit-scrollbar{display:none;}
.filter-chip{appearance:none;white-space:nowrap;border:1px solid var(--line);background:var(--bg-panel);color:var(--ink-soft);font:500 0.8rem 'JetBrains Mono',monospace;padding:9px 12px;border-radius:999px;cursor:pointer;transition:background .15s ease,color .15s ease,border-color .15s ease;}
.filter-chip:hover,.filter-chip.is-active{background:var(--blue);border-color:var(--blue);color:var(--white);}
.resource-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;}
.managed-grid:empty,.managed-videos:empty,.offers-live:empty{display:none;}
.managed-grid{margin-top:14px;}
.managed-videos{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:16px;}
.managed-video{display:block;color:inherit;}
.offers-live{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin-top:22px;}
.offer-card{display:flex;flex-direction:column;align-items:flex-start;gap:14px;padding:22px;background:linear-gradient(135deg,var(--blue-deep),var(--bg-panel));border:1px solid var(--blue);border-radius:var(--radius);}
.offer-card h3{font-size:1.05rem;margin-bottom:6px;}.offer-card p{font-size:.86rem;color:var(--ink-soft);}.offer-card .btn{margin-top:auto;}
.offer-badge{font:600 .66rem 'JetBrains Mono',monospace;letter-spacing:.08em;color:#BBD0FF;}
.resource-card{min-height:212px;background:var(--bg-panel);border:1px solid var(--line);padding:22px;display:flex;flex-direction:column;align-items:flex-start;transition:transform .16s ease,border-color .16s ease,box-shadow .16s ease;}
.resource-card:has(.document-actions){border-top-color:var(--blue);}
.resource-card:hover{transform:translateY(-3px);border-color:var(--blue);box-shadow:var(--shadow-hard);}
.resource-card.is-hidden{display:none;}
.resource-topline{display:flex;align-items:flex-start;justify-content:space-between;width:100%;gap:12px;}
.file-size{margin-top:4px;color:var(--ink-soft);font:500 .65rem 'JetBrains Mono',monospace;letter-spacing:.04em;}
.resource-icon{font:600 .72rem 'JetBrains Mono',monospace;letter-spacing:.07em;width:44px;height:44px;display:grid;place-items:center;border:1px solid currentColor;margin-bottom:20px;}
.resource-topline .resource-icon{margin-bottom:20px;}
.resource-icon--blue{color:var(--blue);background:var(--blue-deep);}
.resource-icon--green{color:var(--green);background:var(--green-deep);}
.resource-icon--orange{color:var(--orange);background:var(--orange-deep);}
.resource-copy{flex-grow:1;}
.resource-type{display:block;color:var(--concrete);font:500 .67rem 'JetBrains Mono',monospace;letter-spacing:.06em;margin-bottom:8px;}
.resource-copy h3,.video-feature-copy h3{font-size:1.08rem;line-height:1.25;margin-bottom:8px;}
.resource-copy p,.video-feature-copy p{font-size:.88rem;color:var(--ink-soft);}
.resource-link,.text-cta{border:0;background:transparent;color:var(--blue);font:600 .82rem 'Inter',sans-serif;padding:0;margin-top:20px;cursor:pointer;}
.document-actions{display:flex;align-items:center;justify-content:space-between;gap:14px;width:100%;margin-top:auto;padding-top:18px;}
.document-actions .resource-link{margin-top:0;}
.download-link{border:1px solid var(--line);padding:7px 9px;color:var(--ink-soft);font:500 .67rem 'JetBrains Mono',monospace;letter-spacing:.02em;transition:border-color .15s ease,color .15s ease,background .15s ease;}
.download-link:hover{border-color:var(--blue);background:rgba(62,123,250,.09);color:var(--ink);}
.resource-link span,.text-cta span{display:inline-block;transition:transform .15s ease;}
.resource-link:hover span,.text-cta:hover span{transform:translate(3px,-2px);}
.resource-note{font-size:.86rem;color:var(--ink-soft);margin-top:22px;}

/* --------------------------------- VIDEOS --------------------------------- */
.videos-section{background:var(--bg);}
.videos-head{margin-bottom:28px;}
.video-feature{display:grid;grid-template-columns:1.2fr .8fr;background:var(--bg-panel);border:1px solid var(--line);margin-bottom:28px;}
.video-feature-player{aspect-ratio:16/9;background:#000;}
.video-feature-player video{width:100%;height:100%;display:block;object-fit:cover;}
.video-feature-copy{padding:30px;display:flex;flex-direction:column;justify-content:center;align-items:flex-start;}
.video-feature-copy h3{font-size:1.5rem;}
.video-gallery{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;}
.video-card{background:var(--bg-panel);border:1px solid var(--line);min-width:0;transition:transform .16s ease,border-color .16s ease;}
.video-card:hover{transform:translateY(-3px);border-color:var(--blue);}
.video-card.is-hidden{display:none;}
.video-open{appearance:none;width:100%;text-align:left;border:0;background:transparent;color:inherit;font:inherit;padding:0;cursor:pointer;}
.video-open:disabled{cursor:default;}
.video-open:disabled .video-play{opacity:.65;}
.video-thumb{aspect-ratio:16/9;position:relative;background:linear-gradient(135deg,var(--blue-deep),var(--bg-panel-2));overflow:hidden;display:grid;place-items:center;}
.video-thumb img{width:100%;height:100%;object-fit:cover;opacity:.62;}
.video-play{position:absolute;width:42px;height:42px;border:1px solid rgba(255,255,255,.8);border-radius:50%;background:rgba(10,14,19,.75);display:grid;place-items:center;color:var(--white);font-size:.85rem;padding-left:2px;}
.video-platform{position:absolute;bottom:9px;left:9px;background:rgba(10,14,19,.85);border:1px solid var(--line);color:var(--ink-soft);font:500 .63rem 'JetBrains Mono',monospace;padding:4px 6px;letter-spacing:.04em;}
.video-card-copy{padding:15px;display:block;}
.video-card-copy h3{font-size:.98rem;line-height:1.28;margin-bottom:7px;}
.video-card-copy strong{font-size:.98rem;line-height:1.28;margin-bottom:7px;display:block;}
.video-card-copy p{font-size:.82rem;color:var(--ink-soft);}
.video-coming{color:var(--concrete);font:500 .69rem 'JetBrains Mono',monospace;letter-spacing:.05em;}
.video-footer{border-top:1px solid var(--line);margin-top:28px;padding-top:22px;display:flex;align-items:center;justify-content:space-between;gap:18px;color:var(--ink-soft);font-size:.9rem;}
.library-intro{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 0 18px;border-bottom:1px solid var(--line);}
.library-intro span{color:var(--blue);font:500 .69rem 'JetBrains Mono',monospace;letter-spacing:.07em;white-space:nowrap;}
.library-intro p{color:var(--ink-soft);font-size:.86rem;text-align:right;}
.video-library{display:grid;gap:16px;margin-top:16px;}
.featured-tutorials{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;}
.help-videos{margin-top:32px;}
.help-group,.youtube-group{border:1px solid var(--line);background:var(--bg-panel);margin-top:10px;}
.help-group summary,.youtube-group summary{cursor:pointer;display:flex;justify-content:space-between;gap:12px;padding:15px 17px;font:600 .86rem 'Space Grotesk',sans-serif;}
.help-group summary span,.youtube-group summary span{color:var(--ink-soft);font:500 .67rem 'JetBrains Mono',monospace;}
.help-group .lesson-list{padding:0 17px 8px;}
.youtube-library{margin-top:18px;}
.youtube-video-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px;padding:0 17px 17px;}
.youtube-video{display:block;min-width:0;color:inherit;}
.youtube-thumb{position:relative;display:block;aspect-ratio:16/9;background:var(--bg-panel-2);overflow:hidden;}
.youtube-thumb img{width:100%;height:100%;object-fit:cover;opacity:.82;transition:transform .2s ease;}
.youtube-video:hover .youtube-thumb img{transform:scale(1.04);}
.youtube-play{position:absolute;left:50%;top:50%;transform:translate(-50%,-50%);width:38px;height:29px;border-radius:8px;background:#ff3030;color:#fff;display:grid;place-items:center;font-size:.7rem;padding-left:2px;}
.youtube-video strong{display:block;margin-top:9px;font-size:.82rem;line-height:1.25;}
.youtube-video small{display:block;margin-top:4px;color:var(--ink-soft);font-size:.7rem;}
.video-card-copy strong,.lesson-name,.youtube-video strong,.youtube-video small{overflow-wrap:anywhere;}

@media (min-width:601px) and (max-width:899px){
  .wrap{padding:0 30px;}
  .app-hero{padding:64px 30px;}
  .video-feature{grid-template-columns:1fr;}
  .video-feature-copy{padding:26px 30px;}
  .youtube-video-grid{grid-template-columns:repeat(3,minmax(0,1fr));}
}
.video-series{display:grid;grid-template-columns:260px minmax(0,1fr);background:var(--bg-panel);border:1px solid var(--line);transition:border-color .2s ease,box-shadow .2s ease;overflow:hidden;}
.video-series:hover,.video-series.is-highlighted{border-color:var(--blue);box-shadow:var(--shadow-hard);}
.series-cover{position:relative;min-height:238px;background:var(--blue-deep);overflow:hidden;}
.series-cover::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,transparent 35%,rgba(4,9,14,.92));}
.series-cover img{width:100%;height:100%;object-fit:cover;opacity:.76;transition:transform .3s ease;}
.video-series:hover .series-cover img{transform:scale(1.04);}
.series-overlay{position:absolute;z-index:1;left:17px;right:17px;bottom:15px;display:flex;flex-direction:column;gap:4px;color:var(--white);}
.series-overlay span{color:#A9C5FF;font:500 .66rem 'JetBrains Mono',monospace;letter-spacing:.06em;}
.series-overlay strong{font:600 .75rem 'JetBrains Mono',monospace;letter-spacing:.05em;}
.series-content{padding:20px 22px;min-width:0;}
.series-heading{display:flex;justify-content:space-between;gap:16px;padding-bottom:14px;border-bottom:1px solid var(--line);}
.series-heading h3{font-size:1.17rem;line-height:1.2;margin-bottom:5px;}
.series-heading p{color:var(--ink-soft);font-size:.84rem;}
.series-count{color:var(--concrete);font:600 1.55rem 'JetBrains Mono',monospace;line-height:1;}
.lesson-list{display:grid;}
.lesson-row{display:grid;grid-template-columns:34px minmax(0,1fr) 74px 22px;align-items:center;gap:9px;width:100%;border:0;border-bottom:1px solid var(--line);background:transparent;color:var(--ink);font:inherit;text-align:left;padding:12px 2px;cursor:pointer;transition:background .15s ease,padding .15s ease;}
.lesson-row:last-child{border-bottom:0;}
.lesson-row:hover{background:rgba(62,123,250,.08);padding-left:8px;padding-right:8px;}
.lesson-number{color:var(--concrete);font:500 .69rem 'JetBrains Mono',monospace;}
.lesson-name{font-size:.86rem;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.lesson-source{color:var(--ink-soft);font:500 .64rem 'JetBrains Mono',monospace;}
.lesson-play{width:22px;height:22px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;color:var(--blue);font-size:.55rem;padding-left:1px;}
.is-disabled{opacity:.55;pointer-events:none;}
.youtube-section{padding:0;border-top:1px solid var(--line);background:var(--bg);}
.youtube-hub{position:relative;overflow:hidden;display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:28px;padding:46px 42px;background:linear-gradient(120deg,#151A24 0%,#111821 58%,#171318 100%);border:1px solid var(--line);border-top:0;}
.youtube-hub::after{content:'';position:absolute;right:-90px;top:-120px;width:330px;height:330px;border-radius:50%;background:radial-gradient(circle,rgba(255,55,55,.16),transparent 68%);pointer-events:none;}
.youtube-mark{width:64px;height:46px;border-radius:12px;background:#FF3030;display:grid;place-items:center;color:#fff;box-shadow:0 8px 26px rgba(255,48,48,.22);font-size:1.25rem;}
.youtube-mark span{padding-left:3px;}
.youtube-copy{position:relative;z-index:1;max-width:63ch;}
.youtube-copy .section-num{color:#FF6868;margin-bottom:8px;}
.youtube-copy h2{font-size:1.8rem;margin-bottom:8px;}
.youtube-copy p{color:var(--ink-soft);font-size:.94rem;}
.youtube-topics{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px;}
.youtube-topics span{border:1px solid #3A3036;background:rgba(0,0,0,.16);padding:6px 9px;color:#C9CDD3;font:500 .69rem 'JetBrains Mono',monospace;letter-spacing:.03em;}
.youtube-button{position:relative;z-index:1;white-space:nowrap;background:#FF3030;border-color:#FF3030;}
.youtube-button:hover{background:#E72828;border-color:#E72828;}
.video-modal{width:min(94vw,520px);padding:0;border:1px solid var(--line);background:var(--bg-panel);color:var(--ink);box-shadow:0 24px 80px rgba(0,0,0,.75);}
.video-modal::backdrop{background:rgba(4,7,11,.78);backdrop-filter:blur(4px);}
.video-modal-head{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:15px 16px;border-bottom:1px solid var(--line);}
.video-modal-head p{font:600 .86rem 'Space Grotesk',sans-serif;}
.modal-close{width:32px;height:32px;border:1px solid var(--line);border-radius:50%;background:var(--bg);color:var(--ink);font-size:1.4rem;line-height:1;cursor:pointer;}
.video-modal-frame{aspect-ratio:9/16;max-height:72vh;background:#000;margin:0 auto;}
.video-modal-frame iframe{display:block;width:100%;height:100%;border:0;}
.video-modal-note{padding:11px 16px;color:var(--ink-soft);font-size:.74rem;text-align:center;}

/* ------------------------------- CONTACT UX ------------------------------ */
.contact-select-label{font:500 .78rem 'JetBrains Mono',monospace;color:var(--ink-soft);letter-spacing:.04em;margin-top:2px;}
.contact-select{width:min(100%,420px);background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);padding:13px 14px;color:var(--ink);font:500 .92rem 'Inter',sans-serif;}
.contact-select:focus-visible{outline:2px solid var(--green);outline-offset:3px;}

/* ------------------------------ MOBILE NAV ------------------------------- */
.mobile-bottom-nav{display:none;}

/* ---------------------------------- REDUCED MOTION ---------------------------------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{transition:none !important;}
}

@media(max-width:600px){
  nav{padding:12px 16px;gap:10px;}
  .brand{font-size:1rem;}
  .nav-cta{display:none;}
  .hero{padding:48px 0 40px;}
  .hero h1{font-size:2rem;}
  .hero p.lede{font-size:0.98rem;}
  .founder-grid{grid-template-columns:1fr;gap:28px;}
  .founder-photo{max-width:none;width:100%;}
  .founder-photo img{aspect-ratio:16/11;object-position:center 33%;}
  .founder-copy h2{font-size:1.75rem;}
  .founder-points{grid-template-columns:1fr;gap:12px;margin-top:24px;}
  .cta-row .btn{flex:1 1 auto;justify-content:center;}
  section{padding:56px 0;}
  .app-hero{padding:44px 20px;}
  .app-hero h2{font-size:2rem;}
  .app-hero-sub{font-size:0.95rem;}
  .app-body{padding:40px 0;}
  .contact-box{padding:32px 22px;}
  .contact-box h2{font-size:1.4rem;}
  .stats{grid-template-columns:1fr 1fr;gap:20px;}
  .foot-row{flex-direction:column;gap:6px;}
  .wrap{padding:0 18px;}
  .logo-slot{width:34px;height:34px;}
  .blueprint{padding:12px;}
  .section-head{margin-bottom:30px;}
  .section-head h2{font-size:1.65rem;line-height:1.15;}
  .cards{gap:14px;}
  .card{display:grid;grid-template-columns:108px 1fr;min-height:142px;}
  .card-art{aspect-ratio:auto;border-bottom:0;border-right:1px solid var(--line);}
  .card-art img{object-position:center;}
  .card-body{padding:17px;gap:7px;}
  .card h3{font-size:1rem;}
  .card .desc{font-size:.82rem;line-height:1.45;}
  .card .go{font-size:.8rem;}
  .feature-list{gap:16px;}
  .feature-list li{gap:12px;}
  .diagram-panel{padding:13px;}
  .video-feature{grid-template-columns:1fr;}
  .video-feature-copy{padding:22px;}
  .video-feature-copy h3{font-size:1.3rem;}
  .resource-grid{grid-template-columns:1fr;gap:10px;}
  .managed-videos,.offers-live{grid-template-columns:1fr;gap:10px;}
  .resource-card{min-height:0;padding:18px;}
  .resource-icon{width:38px;height:38px;margin-bottom:14px;}
  .resource-link{margin-top:16px;}
  .video-gallery{display:flex;overflow-x:auto;gap:12px;padding:2px 0 12px;scroll-snap-type:x mandatory;scrollbar-width:none;}
  .video-gallery::-webkit-scrollbar{display:none;}
  .video-card{min-width:78%;scroll-snap-align:start;}
  .library-intro{align-items:flex-start;flex-direction:column;gap:7px;}
  .library-intro p{text-align:left;}
  .video-library{gap:12px;}
  .featured-tutorials{grid-template-columns:1fr;gap:12px;}
  .youtube-video-grid{grid-template-columns:repeat(2,minmax(0,1fr));padding:0 12px 12px;gap:12px;}
  .video-series{grid-template-columns:112px minmax(0,1fr);}
  .series-cover{min-height:100%;}
  .series-overlay{left:10px;right:10px;bottom:11px;}
  .series-overlay span{font-size:.55rem;}
  .series-overlay strong{font-size:.58rem;}
  .series-content{padding:15px 14px;}
  .series-heading{padding-bottom:10px;}
  .series-heading h3{font-size:1rem;}
  .series-heading p{display:none;}
  .series-count{font-size:1.1rem;}
  .lesson-row{grid-template-columns:25px minmax(0,1fr) 18px;padding:10px 0;}
  .lesson-source{display:none;}
  .lesson-name{font-size:.78rem;}
  .tutorial-callout{gap:10px;}
  .tutorial-preview{width:88px;height:62px;}
  .tutorial-kicker{font-size:.52rem;}
  .tutorial-callout strong{font-size:.78rem;}
  .tutorial-callout small{font-size:.68rem;}
  .video-footer{align-items:flex-start;flex-direction:column;}
  .youtube-hub{grid-template-columns:1fr;gap:18px;padding:30px 22px;}
  .youtube-mark{width:54px;height:39px;border-radius:10px;}
  .youtube-copy h2{font-size:1.5rem;}
  .youtube-button{width:100%;justify-content:center;}
  .contact-box{gap:17px;}
  .contact-select{width:100%;}
  .mobile-bottom-nav{position:fixed;z-index:70;bottom:0;left:0;right:0;height:64px;display:grid;grid-template-columns:repeat(4,1fr);background:rgba(16,22,31,.96);backdrop-filter:blur(12px);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom);}
  .mobile-bottom-nav a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:3px;color:var(--ink-soft);font-size:.65rem;font-weight:600;}
  .mobile-bottom-nav a span{font-size:1rem;line-height:1;}
  .mobile-bottom-nav .mobile-bottom-wa{color:#22C35E;}
  body{padding-bottom:76px;}
}

@media(max-width:400px){
  .mobile-menu a{font-size:0.9rem;}
  .hero h1{font-size:1.7rem;}
}