/*
 * STARTS — landing de la consultora (starts.com.ar).
 * Mismo lenguaje visual que STARTS Campo y STARTS Obras: fondo negro, Barlow, fotos a pantalla completa
 * con degradé a negro, botón blanco sólido y acento naranja del logo.
 */
:root{
  --negro:#000;
  --sup:#0d0d0d;
  --sup2:#161616;
  --texto:#fafafa;
  --texto2:#b3b3b3;
  --texto3:#808080;
  --naranja:#FF8A1F;
  --linea:rgba(255,255,255,.12);
  --linea2:rgba(255,255,255,.28);
  --fuente:"Barlow","DIN","Roboto",Arial,sans-serif;
  --ancho:1200px;
  --barra:84px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--negro);color:var(--texto);font-family:var(--fuente);font-size:17px;line-height:1.55;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
ul,ol{list-style:none}
img,svg,canvas{display:block}
::selection{background:var(--naranja);color:#000}

.contenedor{width:100%;max-width:var(--ancho);margin:0 auto;padding:0 24px}
.naranja{color:var(--naranja)}
.sobre{display:inline-block;font-size:13px;font-weight:700;letter-spacing:4px;text-transform:uppercase;color:var(--naranja);margin-bottom:18px}
h1,h2,h3{font-weight:700;letter-spacing:-.5px;line-height:1.04}
h1{font-size:clamp(48px,8.5vw,112px)}
h2{font-size:clamp(34px,5vw,60px);max-width:16ch}
h3{font-size:22px;letter-spacing:0}
.sub{font-size:clamp(17px,1.6vw,21px);color:var(--texto2);max-width:560px;margin-top:22px}

/* Botones: blanco sólido como en los productos */
.btn{display:inline-flex;align-items:center;gap:10px;background:var(--texto);color:#000;font-weight:700;font-size:15px;letter-spacing:.3px;border-radius:4px;padding:14px 30px;transition:background .25s,color .25s,transform .25s}
.btn:hover{background:var(--naranja);color:#000;transform:translateY(-2px)}
.btn--linea{background:transparent;color:var(--texto);box-shadow:inset 0 0 0 2px var(--linea2)}
.btn--linea:hover{background:var(--texto);color:#000}
.btn--chico{padding:9px 22px;font-size:14px}
.acciones{display:flex;flex-wrap:wrap;gap:14px;margin-top:36px}

/* Logo */
.logo{width:40px;height:40px;border-radius:10px;background:var(--naranja);display:grid;place-items:center;flex:none}
.logo svg{width:84%;height:84%}
.logo--chico{width:34px;height:34px;border-radius:9px}
.marca{display:flex;align-items:center;gap:12px}
.marca b{font-size:22px;font-weight:800;letter-spacing:1.5px}

/* Barra superior: transparente sobre la portada, negra al bajar */
.barra{position:fixed;inset:0 0 auto;height:var(--barra);z-index:50;display:flex;align-items:center;gap:32px;padding:0 max(24px,calc((100vw - var(--ancho))/2 + 24px));transition:background .35s,backdrop-filter .35s,border-color .35s;border-bottom:1px solid transparent}
.barra.solida{background:rgba(0,0,0,.72);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-color:var(--linea)}
.menu{display:flex;gap:30px;margin:0 auto;font-size:14px;font-weight:600;letter-spacing:1px;text-transform:uppercase}
.menu a{color:var(--texto2);transition:color .2s;position:relative}
.menu a::after{content:"";position:absolute;left:0;right:100%;bottom:-6px;height:2px;background:var(--naranja);transition:right .3s}
.menu a:hover{color:var(--texto)}
.menu a:hover::after{right:0}
.idioma{display:flex;border:1px solid var(--linea2);border-radius:4px;overflow:hidden;flex:none}
.idioma button{background:none;border:0;color:var(--texto2);font:700 12px/1 var(--fuente);letter-spacing:1.5px;padding:9px 10px;cursor:pointer;transition:background .2s,color .2s}
.idioma button:hover{color:var(--texto)}
.idioma button[aria-pressed="true"]{background:var(--texto);color:#000}
.hamburguesa{display:none;background:none;border:0;width:40px;height:40px;cursor:pointer;position:relative}
.hamburguesa span{position:absolute;left:8px;right:8px;height:2px;background:var(--texto);transition:transform .3s,top .3s}
.hamburguesa span:first-child{top:15px}
.hamburguesa span:last-child{top:23px}
.hamburguesa[aria-expanded="true"] span:first-child{top:19px;transform:rotate(45deg)}
.hamburguesa[aria-expanded="true"] span:last-child{top:19px;transform:rotate(-45deg)}

/* Portada */
.portada{position:relative;min-height:100vh;min-height:100svh;display:flex;align-items:center;overflow:hidden;background:radial-gradient(ellipse 80% 60% at 70% 110%,rgba(255,138,31,.22),transparent 60%),#000}
#cielo,#cielo2{position:absolute;inset:0;width:100%;height:100%}
.portada__contenido{position:relative;z-index:2;width:100%;max-width:var(--ancho);margin:0 auto;padding:calc(var(--barra) + 40px) 24px 120px;pointer-events:none}
.portada__contenido a{pointer-events:auto}
.escribe{display:inline-block;min-width:1ch;border-right:.06em solid var(--naranja);padding-right:.05em;animation:cursor 1s steps(1) infinite}
@keyframes cursor{50%{border-color:transparent}}
.sello{display:inline-flex;align-items:center;gap:12px;margin-top:34px;padding:9px 18px 9px 14px;border:1px solid var(--linea2);border-radius:40px;background:rgba(255,255,255,.04);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);font-size:14px;font-weight:600;letter-spacing:.4px;color:var(--texto)}
.sello i{position:relative;width:8px;height:8px;border-radius:50%;background:var(--naranja);flex:none}
.sello i::after{content:"";position:absolute;inset:0;border-radius:50%;background:var(--naranja);animation:latido 2s ease-out infinite}
@keyframes latido{to{transform:scale(3.2);opacity:0}}
.bajar{position:absolute;z-index:2;left:50%;bottom:32px;transform:translateX(-50%);width:26px;height:42px;border:2px solid var(--linea2);border-radius:14px}
.bajar span{position:absolute;left:50%;top:8px;width:4px;height:8px;margin-left:-2px;border-radius:2px;background:var(--texto);animation:rueda 1.8s ease-in-out infinite}
@keyframes rueda{0%{opacity:0;transform:translateY(0)}30%{opacity:1}100%{opacity:0;transform:translateY(14px)}}

/* Manifiesto: palabra por palabra */
.manifiesto{padding:clamp(110px,18vh,200px) 24px;max-width:1080px;margin:0 auto}
.enciende{font-size:clamp(28px,4.2vw,54px);font-weight:600;line-height:1.22;letter-spacing:-.3px}
.enciende .p{color:#2b2b2b;transition:color .4s}
.enciende .p.on{color:var(--texto)}
.enciende .p.on.clave{color:var(--naranja)}

/* Productos: fotos a pantalla completa */
.productos{padding-bottom:40px}
.productos>.contenedor{margin-bottom:56px}
.producto{position:relative;min-height:92vh;display:flex;align-items:center;overflow:hidden;margin-top:14px}
.producto::before{content:"";position:absolute;inset:-6% 0;background:var(--foto) center/cover no-repeat;transform:translateY(var(--desplazar,0)) scale(1.06);transition:transform .1s linear}
.producto::after{content:"";position:absolute;inset:0;background:linear-gradient(90deg,rgba(0,0,0,.9) 0%,rgba(0,0,0,.65) 45%,rgba(0,0,0,.1) 100%),linear-gradient(0deg,#000 0%,transparent 30%,transparent 80%,#000 100%)}
.producto--derecha::after{background:linear-gradient(270deg,rgba(0,0,0,.9) 0%,rgba(0,0,0,.65) 45%,rgba(0,0,0,.1) 100%),linear-gradient(0deg,#000 0%,transparent 30%,transparent 80%,#000 100%)}
.producto__texto{position:relative;z-index:2;width:100%;max-width:var(--ancho);margin:0 auto;padding:80px 24px}
.producto__texto>*{max-width:560px}
.producto--derecha .producto__texto>*{margin-left:auto}
.producto__marca{display:flex;align-items:center;gap:16px;margin-bottom:26px}
.producto__marca .logo{width:64px;height:64px;border-radius:16px}
.producto__marca b{display:block;font-size:clamp(30px,3.6vw,44px);line-height:1}
.producto__marca small{display:block;margin-top:8px;font-size:13px;font-weight:700;letter-spacing:4px;text-transform:uppercase;color:var(--naranja)}
.producto p{font-size:19px;color:#d0d0d0}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin:26px 0 34px}
.producto--derecha .chips{justify-content:flex-end}
.chips li{border:1px solid var(--linea2);border-radius:4px;padding:6px 14px;font-size:14px;font-weight:600}
.producto--derecha .producto__texto{text-align:right}
.producto--derecha .producto__marca{flex-direction:row-reverse;width:max-content}

/* Cinta que se desplaza */
.cinta{overflow:hidden;border-block:1px solid var(--linea);padding:26px 0;margin:80px 0 0}
.cinta__pista{display:flex;gap:42px;width:max-content;animation:cinta 32s linear infinite;font-size:clamp(26px,3.4vw,44px);font-weight:700;text-transform:uppercase;letter-spacing:1px;white-space:nowrap}
.cinta__pista span{color:transparent;-webkit-text-stroke:1px var(--texto2)}
.cinta__pista span:nth-of-type(2n){color:var(--texto);-webkit-text-stroke:0}
.cinta__pista i{font-style:normal;color:var(--naranja)}
@keyframes cinta{to{transform:translateX(-50%)}}

/* Servicios */
.servicios{padding:clamp(100px,14vh,160px) 0}
.grilla{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;margin-top:56px;background:var(--linea);border:1px solid var(--linea)}
.tarjeta{position:relative;background:#000;padding:36px 28px 44px;overflow:hidden;min-height:300px}
.tarjeta::before{content:"";position:absolute;inset:0;background:radial-gradient(420px circle at var(--mx,50%) var(--my,50%),rgba(255,138,31,.16),transparent 45%);opacity:0;transition:opacity .3s}
.tarjeta:hover::before{opacity:1}
.tarjeta>*{position:relative}
.tarjeta__num{display:block;font-size:14px;font-weight:700;color:var(--naranja);letter-spacing:2px;margin-bottom:80px}
.tarjeta p{color:var(--texto2);margin-top:12px;font-size:16px}

/* Demo con chat */
.demo{position:relative;padding:clamp(100px,14vh,160px) 0;overflow:hidden}
.demo::before{content:"";position:absolute;inset:0;background:var(--foto) center/cover no-repeat;opacity:.28}
.demo::after{content:"";position:absolute;inset:0;background:linear-gradient(#000,rgba(0,0,0,.55) 30%,rgba(0,0,0,.55) 70%,#000)}
.demo__grilla{position:relative;z-index:2;display:grid;grid-template-columns:1.1fr .9fr;gap:60px;align-items:center}
.demo__texto p{color:var(--texto2);font-size:19px;max-width:460px;margin-top:22px}
.telefono{justify-self:center;width:min(360px,100%);height:600px;background:#0b0b0b;border:1px solid var(--linea2);border-radius:42px;padding:12px;box-shadow:0 40px 90px rgba(0,0,0,.7),0 0 0 8px #111;display:flex;flex-direction:column;overflow:hidden}
.telefono__barra{display:flex;align-items:center;gap:12px;padding:14px 14px 14px;border-bottom:1px solid var(--linea)}
.telefono__barra b{display:block;font-size:15px;line-height:1.1}
.telefono__barra small{display:block;font-size:12px;color:var(--texto3)}
.chat{flex:1;display:flex;flex-direction:column;justify-content:flex-end;gap:8px;padding:16px 8px 8px;overflow:hidden}
.msg{max-width:84%;padding:9px 13px;border-radius:14px;font-size:14.5px;line-height:1.4;animation:entra .35s ease-out both}
.msg.yo{align-self:flex-end;background:#1f2a1f;border-bottom-right-radius:4px}
.msg.bot{align-self:flex-start;background:var(--sup2);border:1px solid var(--linea);border-bottom-left-radius:4px}
.msg.bot b{color:var(--naranja)}
.msg.audio{display:flex;align-items:center;gap:10px;min-width:200px}
.msg.audio i{flex:1;height:18px;background:repeating-linear-gradient(90deg,var(--texto2) 0 2px,transparent 2px 5px);mask:linear-gradient(90deg,#000 60%,rgba(0,0,0,.35) 60%);-webkit-mask:linear-gradient(90deg,#000 60%,rgba(0,0,0,.35) 60%)}
.msg.audio::before{content:"▶";font-size:12px}
.msg.audio small{font-size:12px;color:var(--texto3)}
.escribiendo{align-self:flex-start;display:flex;gap:4px;padding:12px 14px;background:var(--sup2);border:1px solid var(--linea);border-radius:14px;border-bottom-left-radius:4px}
.escribiendo span{width:6px;height:6px;border-radius:50%;background:var(--texto2);animation:salta 1s infinite}
.escribiendo span:nth-child(2){animation-delay:.15s}
.escribiendo span:nth-child(3){animation-delay:.3s}
@keyframes salta{0%,60%,100%{transform:translateY(0);opacity:.4}30%{transform:translateY(-4px);opacity:1}}
@keyframes entra{from{opacity:0;transform:translateY(10px) scale(.97)}to{opacity:1;transform:none}}

/* Método: línea que se completa al bajar */
.metodo{padding:clamp(100px,14vh,160px) 0}
.pasos{position:relative;display:grid;grid-template-columns:repeat(4,1fr);gap:28px;margin-top:70px;padding-top:44px;counter-reset:paso}
.pasos::before,.pasos::after{content:"";position:absolute;top:0;left:0;height:2px;background:var(--linea)}
.pasos::before{right:0}
.pasos::after{width:var(--avance,0%);background:var(--naranja);transition:width .2s linear}
.pasos li{position:relative;counter-increment:paso}
.pasos li::before{content:"0" counter(paso);position:absolute;top:-58px;left:0;font-size:13px;font-weight:700;letter-spacing:2px;color:var(--naranja);background:#000;padding-right:10px}
.pasos b{display:block;font-size:26px;margin-bottom:10px}
.pasos span{color:var(--texto2)}

/* Contacto */
.contacto{position:relative;min-height:90vh;display:flex;align-items:center;overflow:hidden;background:radial-gradient(ellipse 70% 60% at 50% 120%,rgba(255,138,31,.28),transparent 65%),#000;text-align:center}
.contacto__contenido{position:relative;z-index:2;display:flex;flex-direction:column;align-items:center;pointer-events:none}
.contacto__contenido a{pointer-events:auto}
.gigante{font-size:clamp(46px,13vw,190px);max-width:none;letter-spacing:-2px}
.contacto .sub{margin-inline:auto}
.contacto .acciones{justify-content:center}

/* Pie */
.pie{border-top:1px solid var(--linea);padding:34px 0;color:var(--texto3);font-size:14px}
.pie__grilla{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px}
.pie .marca b{font-size:18px;color:var(--texto)}
.pie .logo{width:32px;height:32px;border-radius:8px}

/* Aparición al bajar */
.aparece{opacity:0;transform:translateY(28px);transition:opacity .7s ease-out,transform .7s ease-out}
.aparece.visto{opacity:1;transform:none}

/* Tablet y celular */
@media (max-width:960px){
  .grilla{grid-template-columns:repeat(2,1fr)}
  .demo__grilla{grid-template-columns:1fr}
  .pasos{grid-template-columns:repeat(2,1fr);row-gap:70px}
  .pasos::before,.pasos::after{display:none}
}
@media (max-width:760px){
  :root{--barra:68px}
  .barra{gap:12px}
  .idioma{margin-left:auto}
  .hamburguesa{display:block}
  .menu{position:fixed;inset:var(--barra) 0 auto;height:calc(100svh - var(--barra));flex-direction:column;gap:0;margin:0;padding:24px;background:#000;font-size:24px;opacity:0;visibility:hidden;transform:translateY(-10px);transition:opacity .3s,transform .3s,visibility .3s}
  .menu a{padding:18px 0;border-bottom:1px solid var(--linea);color:var(--texto)}
  .menu a::after{display:none}
  .menu.abierto{opacity:1;visibility:visible;transform:none}
  .producto{min-height:auto}
  .producto__texto{padding:120px 24px 70px}
  .producto::after,.producto--derecha::after{background:linear-gradient(0deg,#000 0%,rgba(0,0,0,.82) 55%,rgba(0,0,0,.35) 100%)}
  .producto--derecha .producto__texto{text-align:left}
  .producto--derecha .producto__texto>*{margin-left:0}
  .producto--derecha .producto__marca{flex-direction:row}
  .producto--derecha .chips{justify-content:flex-start}
  .grilla{grid-template-columns:1fr}
  .tarjeta{min-height:0}
  .tarjeta__num{margin-bottom:24px}
  .pasos{grid-template-columns:1fr;row-gap:56px}
  .telefono{height:540px}
}
@media (max-width:420px){
  .barra .btn--chico{display:none}
}

/* Quien prefiere menos movimiento */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation:none!important;transition:none!important}
  .aparece{opacity:1;transform:none}
  .enciende .p{color:var(--texto)}
}