/* ===========================================================
   GRUPO ALTECO — Sistema visual institucional
   Referente: infraestructura premium (Grupo ACS / Dragados / Hochtief)
   Blanco dominante · antracita · rojo como acento fino · aire · foto a sangre
   =========================================================== */
:root{
  --red:#E12229; --red-d:#B4141A; --red-soft:#faeaea;
  --black:#0A0A0A; --ink:#17181B; --anth:#333336; --anth-2:#4a4c50;
  --paper:#ffffff; --mist:#F5F6F7; --mist-2:#EDEEF0;
  --line:#E4E6E9; --line-2:#D5D8Dc; --line-dk:#26272B;
  --mut:#6C7178; --mut-2:#8A8F96;
  --wa:#25D366;
  --maxw:1240px;
  --ease:cubic-bezier(.22,.61,.36,1);
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;scroll-padding-top:88px}
body{font-family:'Barlow',-apple-system,system-ui,Segoe UI,sans-serif;background:var(--paper);color:var(--ink);line-height:1.62;overflow-x:hidden;font-size:17px;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility}
h1,h2,h3,h4,h5,.disp{font-family:'Rajdhani',sans-serif;line-height:1.05;letter-spacing:-.01em;font-weight:600;color:var(--anth)}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
::selection{background:var(--red);color:#fff}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px}

/* Eyebrow — etiqueta con línea roja fina, sello institucional */
.eyebrow{display:inline-flex;align-items:center;gap:12px;font-family:'Rajdhani';color:var(--anth);font-weight:600;font-size:13px;letter-spacing:.22em;text-transform:uppercase}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--red);display:inline-block}
.dark .eyebrow,.hero .eyebrow{color:#fff}
.sec-head .eyebrow{margin-bottom:0}

/* Buttons — planos, cuadrados, sin glow */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:16px 30px;font-family:'Rajdhani';font-weight:600;font-size:15px;text-transform:uppercase;letter-spacing:.10em;min-height:54px;border-radius:0;border:1px solid transparent;cursor:pointer;transition:background .25s var(--ease),color .25s var(--ease),border-color .25s var(--ease),transform .25s var(--ease)}
.btn:active{transform:translateY(1px)}
.btn.p{background:var(--red);color:#fff}
.btn.p:hover{background:var(--red-d)}
.btn.d{background:var(--anth);color:#fff}
.btn.d:hover{background:var(--black)}
.btn.o{background:transparent;border-color:rgba(255,255,255,.55);color:#fff}
.btn.o:hover{background:#fff;color:var(--anth);border-color:#fff}
.btn.dl{background:transparent;border-color:var(--line-2);color:var(--anth)}
.btn.dl:hover{border-color:var(--anth);background:var(--anth);color:#fff}
.btn.g{background:transparent;border-color:rgba(255,255,255,.55);color:#fff}
.btn.g:hover{background:#fff;color:var(--anth)}
.btn .waglyph{width:17px;height:17px;flex:0 0 auto}
.btn-row{display:flex;gap:14px;flex-wrap:wrap}

/* ============ HEADER ============ */
header{position:sticky;top:0;z-index:100;background:rgba(10,10,10,.86);backdrop-filter:saturate(150%) blur(14px);-webkit-backdrop-filter:saturate(150%) blur(14px);border-bottom:1px solid rgba(255,255,255,.10)}
.nav{display:flex;align-items:center;justify-content:space-between;height:74px}
.brand{display:flex;align-items:center;gap:12px}
.brand img{height:34px}
.brand b{font-family:'Rajdhani';font-weight:600;font-size:20px;letter-spacing:.14em;color:#fff}
.brand b span{color:#fff}
.navlinks{display:flex;gap:6px;align-items:center}
.navlinks a{position:relative;font-family:'Rajdhani';font-weight:500;font-size:14px;letter-spacing:.06em;text-transform:uppercase;color:#c3c5c9;padding:10px 14px;transition:color .2s}
.navlinks a::after{content:"";position:absolute;left:14px;right:14px;bottom:4px;height:2px;background:var(--red);transform:scaleX(0);transform-origin:left;transition:transform .28s var(--ease)}
.navlinks a:hover{color:#fff}
.navlinks a.active{color:#fff}
.navlinks a.active::after,.navlinks a:hover::after{transform:scaleX(1)}
.navlinks .btn{margin-left:12px;padding:11px 20px;min-height:44px;font-size:13px}
.navlinks .btn.p::after{display:none}
.burger{display:none;background:none;border:none;flex-direction:column;gap:6px;padding:8px;cursor:pointer}
.burger span{width:26px;height:2px;background:#fff;display:block;transition:.25s}
.mobilemenu{display:none;background:#0A0A0A;border-bottom:1px solid var(--line-dk)}
.mobilemenu a{display:block;padding:16px 32px;color:#e6e6e8;font-family:'Rajdhani';font-weight:500;letter-spacing:.05em;text-transform:uppercase;font-size:15px;border-top:1px solid #17181b}
.mobilemenu a:last-child{color:#fff;background:var(--red)}

/* ============ HERO ============ */
.hero{position:relative;display:flex;align-items:flex-end;color:#fff;background:#0A0A0A;min-height:88vh;overflow:hidden}
.hero.short{min-height:64vh}
.hero .bgimg{position:absolute;inset:0;background-size:cover;background-position:center;transform:scale(1.03);animation:heroZoom 14s var(--ease) forwards}
.hero .bgvid{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;background:#0A0A0A}
@keyframes heroZoom{to{transform:scale(1)}}
.hero::after{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(10,10,10,.36) 0%,rgba(10,10,10,.30) 40%,rgba(10,10,10,.82) 100%),linear-gradient(94deg,rgba(10,10,10,.72) 0%,rgba(10,10,10,.30) 60%,rgba(10,10,10,0) 100%)}
.hero.plain::after{background:radial-gradient(120% 120% at 12% -10%,#202124 0%,#0A0A0A 68%)}
.hero.plain{align-items:center}
.hero.plain .inner{padding:96px 0}
.hero.plain::before{content:"";position:absolute;top:0;left:0;width:44%;height:2px;background:var(--red);z-index:2}
.hero .inner{position:relative;z-index:2;padding:0 0 74px;max-width:860px}
.hero .eyebrow{margin-bottom:22px}
.hero h1{font-size:clamp(40px,5.6vw,74px);font-weight:600;letter-spacing:-.015em;margin:0 0 20px;color:#fff;max-width:15ch}
.hero.short h1{font-size:clamp(36px,4.6vw,56px)}
.hero p.sub{font-size:clamp(17px,1.5vw,21px);color:#dfe0e2;max-width:60ch;font-weight:400;line-height:1.55}
.hero .cta{display:flex;gap:14px;flex-wrap:wrap;margin-top:34px}
.badges{display:flex;gap:26px;flex-wrap:wrap;margin-top:32px}
.badge{position:relative;padding-left:22px;font-size:14px;font-weight:500;letter-spacing:.02em;color:#ececed}
.badge::before{content:"";position:absolute;left:0;top:8px;width:10px;height:10px;background:var(--red)}

/* ============ TICKER / PROMISE BAR ============ */
.promise{background:var(--anth);color:#fff;border-top:2px solid var(--red)}
.promise .wrap{display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;padding:26px 32px}
.promise .big{font-family:'Rajdhani';font-weight:600;font-size:20px;letter-spacing:.01em;color:#fff}
.promise .item{display:flex;flex-direction:column;gap:3px}
.promise .item b{font-family:'Rajdhani';font-size:30px;font-weight:600;line-height:1;color:#fff}
.promise .item span{font-size:12px;color:#b9bbbf;text-transform:uppercase;letter-spacing:.14em}
.promise .dv{width:1px;height:46px;background:rgba(255,255,255,.16)}

/* ============ SECTIONS ============ */
section{padding:104px 0}
.sec-head{max-width:760px;margin:0 auto 60px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:16px}
.sec-head h2{font-size:clamp(30px,3.6vw,46px);font-weight:600;letter-spacing:-.015em}
.sec-head p{font-size:18px;color:var(--mut);max-width:60ch;line-height:1.6}
.dark{background:var(--black);color:#fff}
.dark .sec-head h2{color:#fff}.dark .sec-head p{color:#a9acb1}
.soft{background:var(--mist)}

/* ============ UNIT CARDS (home) ============ */
.units{display:grid;grid-template-columns:repeat(2,1fr);gap:2px;background:var(--line);border:1px solid var(--line)}
.unit{position:relative;overflow:hidden;min-height:320px;display:flex;align-items:flex-end;color:#fff;background:#141416}
.unit .bg{position:absolute;inset:0;background-size:cover;background-position:center;transform:scale(1);transition:transform .8s var(--ease);filter:saturate(.92)}
.unit::after{content:'';position:absolute;inset:0;background:linear-gradient(0deg,rgba(10,10,10,.94) 0%,rgba(10,10,10,.55) 45%,rgba(10,10,10,.12) 100%)}
.unit::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:var(--red);transform:scaleX(0);transform-origin:left;z-index:3;transition:transform .5s var(--ease)}
.unit:hover .bg{transform:scale(1.06)}
.unit:hover::before{transform:scaleX(1)}
.unit .c{position:relative;z-index:2;padding:34px}
.unit .n{font-family:'Rajdhani';font-size:12px;font-weight:600;letter-spacing:.2em;text-transform:uppercase;color:#fff;display:inline-flex;align-items:center;gap:10px}
.unit .n::before{content:"";width:20px;height:2px;background:var(--red)}
.unit h3{font-size:32px;margin:12px 0 10px;color:#fff}
.unit p{font-size:15.5px;color:#d3d4d6;margin-bottom:16px;max-width:44ch;font-weight:400}
.unit .go{font-family:'Rajdhani';font-weight:600;text-transform:uppercase;font-size:13px;letter-spacing:.1em;color:#fff;display:inline-flex;align-items:center;gap:8px;transition:gap .3s var(--ease)}
.unit:hover .go{gap:14px}
.unit.flag .c{background:linear-gradient(0deg,rgba(180,20,26,.28),transparent 60%)}

/* ============ PRODUCT CARDS ============ */
.pcards{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.pcard{border:1px solid var(--line);background:#fff;overflow:hidden;transition:border-color .3s var(--ease),transform .3s var(--ease)}
.pcard:hover{transform:translateY(-6px);border-color:var(--line-2)}
.pcard .im{height:230px;background-size:cover;background-position:center;transition:transform .8s var(--ease)}
.pcard:hover .im{transform:scale(1.05)}
.pcard .imwrap{overflow:hidden}
.pcard .bd{padding:28px 26px 30px;position:relative}
.pcard .tag{display:inline-block;color:var(--red);font-family:'Rajdhani';font-weight:600;font-size:12px;letter-spacing:.14em;text-transform:uppercase;padding-bottom:14px}
.pcard h3{font-size:28px;color:var(--anth);margin-bottom:4px}
.pcard .role{color:var(--mut);font-family:'Rajdhani';font-weight:500;font-size:14px;text-transform:uppercase;letter-spacing:.06em;margin-bottom:14px}
.pcard p{font-size:15px;color:var(--anth-2);margin-bottom:18px}
.pcard a.more{font-family:'Rajdhani';font-weight:600;color:var(--anth);text-transform:uppercase;font-size:13.5px;letter-spacing:.08em;display:inline-flex;align-items:center;gap:8px;border-bottom:2px solid var(--red);padding-bottom:3px;transition:gap .3s var(--ease)}
.pcard a.more:hover{gap:13px}

/* ============ FEATURE ROWS ============ */
.feat{display:grid;grid-template-columns:1fr 1fr;gap:70px;align-items:center;margin-bottom:100px}
.feat:last-child{margin-bottom:0}
.feat .txt .eyebrow{margin-bottom:18px}
.feat .txt h3{font-size:clamp(28px,3vw,40px);color:var(--anth);margin:0 0 16px;letter-spacing:-.015em}
.feat .txt p{font-size:16.5px;color:var(--anth-2);margin-bottom:24px;line-height:1.62}
.feat .im{overflow:hidden;height:440px;background-size:cover;background-position:center}
.feat.rev .im{order:-1}
.feat .btn{margin-top:6px}
.specs{display:grid;grid-template-columns:repeat(2,1fr);gap:0;border-top:1px solid var(--line);border-left:1px solid var(--line)}
.spec{padding:20px 22px;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}
.spec b{font-family:'Rajdhani';font-size:30px;font-weight:600;color:var(--anth);display:block;line-height:1;letter-spacing:-.01em}
.spec span{font-size:12.5px;color:var(--mut);text-transform:uppercase;letter-spacing:.1em;margin-top:6px;display:block}

/* ============ ICON / INDEX GRID ============ */
.igrid{display:grid;grid-template-columns:repeat(3,1fr);gap:2px;background:var(--line);border:1px solid var(--line)}
.dark .igrid{background:var(--line-dk);border-color:var(--line-dk)}
.icard{background:#fff;padding:38px 32px;transition:background .3s var(--ease)}
.dark .icard{background:var(--black)}
.icard:hover{background:var(--mist)}
.dark .icard:hover{background:#131316}
.icard .num{font-family:'Rajdhani';font-weight:600;color:var(--red);font-size:14px;letter-spacing:.14em}
.icard h4{font-size:22px;color:var(--anth);margin:14px 0 10px;font-weight:600}
.dark .icard h4{color:#fff}
.icard p{font-size:15px;color:var(--anth-2)}
.dark .icard p{color:#a9acb1}
.icard img{width:34px;height:34px;margin-bottom:18px}
.wgrid4{display:grid;grid-template-columns:repeat(4,1fr);gap:2px;background:var(--line);border:1px solid var(--line)}
.dark .wgrid4{background:var(--line-dk);border-color:var(--line-dk)}
.wgrid4 .icard{padding:36px 28px}

/* ============ STATS ============ */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:2px;background:var(--line-dk);border:1px solid var(--line-dk)}
.stats .s{background:var(--black);padding:40px 24px;text-align:center}
.stats .s b{font-family:'Rajdhani';font-size:clamp(38px,4vw,54px);color:#fff;display:block;line-height:1;font-weight:600;letter-spacing:-.01em}
.stats .s b::after{content:"";display:block;width:30px;height:3px;background:var(--red);margin:16px auto 0}
.stats .s span{font-size:13px;color:#a9acb1;text-transform:uppercase;letter-spacing:.12em;margin-top:14px;display:block}
section:not(.dark) .stats{background:var(--line);border-color:var(--line)}
section:not(.dark) .stats .s{background:#fff}
section:not(.dark) .stats .s b{color:var(--anth)}
section:not(.dark) .stats .s span{color:var(--mut)}

/* ============ GALLERY ============ */
.gal{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.gal .g{overflow:hidden;height:250px;background-size:cover;background-position:center;transition:transform .8s var(--ease);filter:saturate(.95)}
.gal .gw{overflow:hidden}
.gal .g.tall{grid-row:span 2;height:516px}
.gal .g{position:relative}
.gal .g::after{content:"";position:absolute;inset:0;background:rgba(10,10,10,0);transition:background .4s var(--ease)}
.gal .g:hover{filter:saturate(1.04) brightness(1.04)}

/* ============ FORM ============ */
.formwrap{display:grid;grid-template-columns:1fr 1.05fr;gap:64px;align-items:start}
.formwrap h2{font-size:clamp(28px,3.4vw,44px);color:var(--anth);margin:16px 0 16px;letter-spacing:-.015em}
.formwrap p{font-size:17px;color:var(--anth-2);margin-bottom:22px}
.pill{display:inline-flex;gap:8px;align-items:center;background:#fff;border:1px solid var(--line);color:var(--anth);font-family:'Rajdhani';font-weight:600;font-size:13px;letter-spacing:.04em;text-transform:uppercase;padding:9px 16px;margin-right:8px;margin-bottom:8px}
form{background:#fff;border:1px solid var(--line);padding:36px}
.field{margin-bottom:18px}
.field label{display:block;font-family:'Rajdhani';font-weight:600;font-size:12.5px;text-transform:uppercase;letter-spacing:.1em;color:var(--anth);margin-bottom:8px}
.field input,.field select,.field textarea{width:100%;border:1px solid var(--line-2);border-radius:0;padding:15px;font-family:'Barlow';font-size:16px;background:#fff;color:var(--ink);min-height:54px;transition:border-color .2s}
.field input::placeholder,.field textarea::placeholder{color:var(--mut-2)}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--red)}
form .btn{width:100%;margin-top:6px}
.formnote{font-size:12.5px;color:var(--mut);margin-top:14px;text-align:center}

/* ============ CLOSING / SOFT CTA ============ */
.soft .eyebrow{justify-content:center}
.center-cta{max-width:840px;margin:0 auto;text-align:center;display:flex;flex-direction:column;align-items:center;gap:16px}
.center-cta h2{font-size:clamp(28px,3.4vw,42px);color:var(--anth);letter-spacing:-.015em}
.center-cta p{font-size:18px;color:var(--anth-2);line-height:1.6}

/* ============ WHATSAPP FAB ============ */
.wafab{position:fixed;right:24px;bottom:24px;bottom:calc(24px + env(safe-area-inset-bottom));z-index:120;background:var(--wa);color:#fff;border-radius:0;padding:15px 22px;font-family:'Rajdhani';font-weight:600;font-size:15px;letter-spacing:.05em;text-transform:uppercase;box-shadow:0 10px 30px rgba(0,0,0,.22);display:inline-flex;align-items:center;gap:10px;transition:transform .25s var(--ease)}
.wafab:hover{transform:translateY(-2px)}
.wafab .waglyph{width:20px;height:20px}

/* ============ FOOTER ============ */
footer{background:var(--black);color:#8a8d93;padding:80px 0 34px;border-top:2px solid var(--red)}
.foot{display:flex;justify-content:space-between;align-items:flex-start;gap:40px;flex-wrap:wrap;padding-bottom:44px;border-bottom:1px solid var(--line-dk)}
.foot .brand{margin-bottom:16px}
.foot .brand b{color:#fff}
.foot>div:first-child p{font-size:14px;color:#9a9da3;line-height:1.6;max-width:34ch}
.foot .col h5{font-family:'Rajdhani';color:#fff;font-size:13px;letter-spacing:.14em;text-transform:uppercase;margin-bottom:16px;font-weight:600}
.foot .col a,.foot .col p{display:block;font-size:14.5px;color:#9a9da3;margin-bottom:10px;transition:color .2s}
.foot .col a:hover{color:#fff}
.copy{margin-top:26px;font-size:12.5px;color:#71747a;letter-spacing:.02em;text-align:center}

/* ============ RESPONSIVE ============ */
@media (max-width:1024px){
  .units{grid-template-columns:repeat(2,1fr)}
  .wgrid4{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .feat{gap:44px}
}
@media (max-width:860px){
  body{font-size:16px}
  .navlinks{display:none}.burger{display:flex}
  .nav{height:64px}
  .hero{min-height:82vh}.hero .inner{padding-bottom:56px}
  section{padding:70px 0}
  .sec-head{margin-bottom:44px}
  .units{grid-template-columns:1fr}
  .pcards{grid-template-columns:1fr;max-width:480px;margin:0 auto}
  .igrid{grid-template-columns:1fr}
  .feat{grid-template-columns:1fr;gap:30px;margin-bottom:64px}.feat.rev .im{order:0}.feat .im{height:320px}
  .formwrap{grid-template-columns:1fr;gap:34px}
  .gal{grid-template-columns:repeat(2,1fr)}.gal .g.tall{grid-row:span 1;height:250px}
  .promise .wrap{justify-content:flex-start;gap:24px 30px}
  .promise .dv{display:none}
  .promise .big{flex-basis:100%}
}
@media (max-width:520px){
  .wrap{padding:0 20px}
  .hero .cta{flex-direction:column;align-items:stretch}
  .hero .cta .btn{width:100%}
  .badges{gap:14px 22px}
  .wgrid4,.stats{grid-template-columns:1fr}
  .gal{grid-template-columns:1fr}
  .promise .item b{font-size:26px}
  form{padding:26px 22px}
  .wafab{right:16px;bottom:16px;padding:13px 18px;font-size:14px}
}
/* ====== FASE 1 · Interactividad ====== */
.reto{background:var(--mist)}
.reto-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:2px;background:var(--line);border:1px solid var(--line)}
.reto-card{background:#fff;padding:26px 22px;cursor:pointer;text-align:left;border:none;font:inherit;transition:background .25s var(--ease),color .25s var(--ease)}
.reto-card:hover,.reto-card.active{background:var(--anth);color:#fff}
.reto-card .ic{color:var(--red);display:block;height:30px}
.reto-card.active .ic,.reto-card:hover .ic{color:#fff}
.reto-card h4{font-family:'Rajdhani';font-weight:600;font-size:19px;margin:14px 0 5px;color:inherit;letter-spacing:.01em}
.reto-card p{font-size:13.5px;color:var(--mut);margin:0}
.reto-card:hover p,.reto-card.active p{color:#cfd0d2}
.reto-panel{border:1px solid var(--line);border-top:none;background:#fff;overflow:hidden;max-height:0;transition:max-height .45s var(--ease)}
.reto-panel.open{max-height:520px}
.reto-inner{padding:30px 28px;display:grid;grid-template-columns:1.25fr 1fr;gap:28px;align-items:center}
.reto-inner .k{font-family:'Rajdhani';font-weight:600;color:var(--red);letter-spacing:.12em;text-transform:uppercase;font-size:13px}
.reto-inner h3{font-size:30px;color:var(--anth);margin:8px 0 8px}
.reto-inner>div>p{font-size:15.5px;color:var(--anth-2);margin-bottom:16px}
.reto-specs{display:flex;gap:26px;margin-bottom:20px}
.reto-specs b{font-family:'Rajdhani';font-size:28px;color:var(--anth);display:block;line-height:1}
.reto-specs span{font-size:12px;color:var(--mut);text-transform:uppercase;letter-spacing:.08em}
.reto-cta{display:flex;gap:12px;flex-wrap:wrap}
.reto-im{height:230px;background-size:cover;background-position:center}

.ba{position:relative;height:440px;overflow:hidden;border:1px solid var(--line);touch-action:none;background:#0a0a0a}
.ba img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;pointer-events:none;display:block}
.ba .after{clip-path:inset(0 0 0 50%)}
.ba-line{position:absolute;top:0;bottom:0;left:50%;width:3px;background:var(--red);transform:translateX(-50%);pointer-events:none;z-index:3}
.ba-handle{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);width:46px;height:46px;border-radius:50%;background:var(--red);color:#fff;display:flex;align-items:center;justify-content:center;font-size:20px;box-shadow:0 4px 16px rgba(0,0,0,.35);pointer-events:none;z-index:3}
.ba input[type=range]{position:absolute;inset:0;width:100%;height:100%;margin:0;opacity:0;cursor:ew-resize;z-index:4}
.ba .tag{position:absolute;top:16px;font-family:'Rajdhani';font-weight:600;letter-spacing:.1em;text-transform:uppercase;font-size:12px;color:#fff;background:rgba(10,10,10,.62);padding:6px 12px;z-index:2}
.ba .tag.l{left:16px}.ba .tag.r{right:16px}
.ba-cap{font-size:13.5px;color:var(--mut);text-align:center;margin:12px 0 26px;font-family:'Rajdhani';font-weight:500;letter-spacing:.04em;text-transform:uppercase}

.reveal{opacity:0;transform:translateY(24px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1!important;transform:none!important;transition:none}}
@media (max-width:860px){.reto-grid{grid-template-columns:repeat(2,1fr)}.reto-inner{grid-template-columns:1fr}.reto-im{display:none}.reto-panel.open{max-height:640px}.ba{height:300px}}

/* SCROLLPROG */
.scrollprog{position:fixed;top:0;left:0;right:0;height:3px;z-index:200;pointer-events:none}
.scrollprog-f{height:100%;width:0;background:var(--red)}

/* ===== AICHAT · Asistente IA web ===== */
.aichat-launch{position:fixed;right:24px;bottom:96px;bottom:calc(96px + env(safe-area-inset-bottom));z-index:130;width:58px;height:58px;border-radius:50%;background:var(--red);color:#fff;border:none;cursor:pointer;box-shadow:0 12px 30px rgba(0,0,0,.28);display:flex;align-items:center;justify-content:center;transition:transform .25s var(--ease)}
.aichat-launch:hover{transform:translateY(-2px);background:var(--red-d)}
.aichat-launch svg{width:26px;height:26px}
.aichat-panel{position:fixed;right:24px;bottom:96px;bottom:calc(96px + env(safe-area-inset-bottom));z-index:131;width:376px;max-width:calc(100vw - 32px);height:min(560px,72vh);background:#fff;border:1px solid var(--line);box-shadow:0 26px 64px rgba(0,0,0,.30);display:flex;flex-direction:column;overflow:hidden}
.aichat-head{background:var(--black);color:#fff;padding:15px 18px;display:flex;align-items:center;gap:11px;border-top:3px solid var(--red)}
.aichat-head .t{font-family:'Rajdhani',sans-serif;font-weight:600;font-size:18px;letter-spacing:.02em;line-height:1;color:#fff}
.aichat-head .s{font-size:11.5px;color:#b9bbbf;margin-top:3px}
.aichat-head .dot{width:8px;height:8px;border-radius:50%;background:#25D366;box-shadow:0 0 0 3px rgba(37,211,102,.2);flex:0 0 auto}
.aichat-x{margin-left:auto;background:none;border:none;color:#c3c5c9;font-size:24px;cursor:pointer;line-height:1;padding:0 2px}
.aichat-x:hover{color:#fff}
.aichat-body{flex:1;overflow-y:auto;padding:18px;background:var(--mist);display:flex;flex-direction:column;gap:10px}
.aichat-msg{max-width:82%;padding:11px 14px;font-size:14.5px;line-height:1.5;white-space:pre-wrap;font-family:'Barlow',sans-serif}
.aichat-msg.b{background:#fff;border:1px solid var(--line);color:var(--ink);align-self:flex-start}
.aichat-msg.u{background:var(--anth);color:#fff;align-self:flex-end}
.aichat-chips{display:flex;flex-wrap:wrap;gap:7px;margin-top:2px}
.aichat-chip{font-family:'Rajdhani',sans-serif;font-weight:600;font-size:12.5px;letter-spacing:.03em;text-transform:uppercase;background:#fff;border:1px solid var(--line-2);color:var(--anth);padding:7px 11px;cursor:pointer;transition:.2s}
.aichat-chip:hover{border-color:var(--red);color:var(--red)}
.aichat-ficha{display:inline-flex;align-items:center;gap:8px;margin-top:2px;align-self:flex-start;font-family:'Rajdhani',sans-serif;font-weight:600;font-size:13px;letter-spacing:.03em;color:var(--red);border-bottom:2px solid var(--red);padding-bottom:2px}
.aichat-foot{display:flex;gap:8px;padding:11px;border-top:1px solid var(--line);background:#fff}
.aichat-input{flex:1;border:1px solid var(--line-2);border-radius:0;padding:12px 14px;font-family:'Barlow',sans-serif;font-size:15px;min-height:46px;color:var(--ink);background:#fff}
.aichat-input:focus{outline:none;border-color:var(--red)}
.aichat-send{background:var(--red);color:#fff;border:none;width:48px;min-width:48px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:.2s}
.aichat-send:hover{background:var(--red-d)}
.aichat-send svg{width:20px;height:20px}
.aichat-typing{align-self:flex-start;background:#fff;border:1px solid var(--line);padding:13px 16px;display:inline-flex;gap:4px}
.aichat-typing i{width:6px;height:6px;border-radius:50%;background:var(--mut);display:inline-block;animation:aitb 1s infinite}
.aichat-typing i:nth-child(2){animation-delay:.15s}.aichat-typing i:nth-child(3){animation-delay:.3s}
@keyframes aitb{0%,60%,100%{opacity:.3;transform:translateY(0)}30%{opacity:1;transform:translateY(-3px)}}
@media (max-width:520px){.aichat-panel{right:8px;left:8px;width:auto;bottom:84px;height:72vh}.aichat-launch{bottom:84px;right:16px}}