/* ============================================================
   SUDANDINA PROYECTOS E INGENIERÍA S.A.S.
   Sistema de diseño corporativo premium
   ============================================================ */

:root{
  --azul:#0A2F6B;
  --azul-2:#12408c;
  --azul-electrico:#1E6BFF;
  --gris:#7A7A7A;
  --gris-2:#9aa1ac;
  --blanco:#FFFFFF;
  --gris-claro:#F5F7FA;
  --gris-borde:#E4E8EF;
  --grafito:#1D1D1D;
  --grafito-2:#14181f;
  --sombra:0 20px 60px rgba(10,47,107,.10);
  --sombra-fuerte:0 30px 80px rgba(10,47,107,.18);
  --radio:18px;
  --radio-sm:12px;
  --ancho:1240px;
  --ease:cubic-bezier(.16,1,.3,1);
  --serif:'Fraunces',Georgia,serif;
  --sans:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:var(--sans);
  color:var(--grafito);
  background:var(--blanco);
  line-height:1.6;
  overflow-x:hidden;
  font-size:17px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
ul{list-style:none}
section{position:relative}

/* ---------- Tipografía ---------- */
h1,h2,h3,h4{font-family:var(--sans);font-weight:700;line-height:1.1;letter-spacing:-.02em;color:var(--azul)}
h1{font-size:clamp(2.6rem,6vw,5rem);font-weight:800}
h2{font-size:clamp(2rem,4vw,3.2rem)}
h3{font-size:clamp(1.3rem,2vw,1.7rem)}
.eyebrow{
  display:inline-flex;align-items:center;gap:.6rem;
  font-size:.8rem;font-weight:700;letter-spacing:.22em;text-transform:uppercase;
  color:var(--azul-electrico);margin-bottom:1.1rem;
}
.eyebrow::before{content:"";width:34px;height:2px;background:var(--azul-electrico);display:inline-block}
.lead{font-size:clamp(1.05rem,1.6vw,1.3rem);color:var(--gris);max-width:60ch}
.muted{color:var(--gris)}

/* ---------- Layout ---------- */
.container{max-width:var(--ancho);margin:0 auto;padding:0 28px}
.section{padding:clamp(70px,10vw,140px) 0}
.section--tight{padding:clamp(50px,7vw,90px) 0}
.bg-soft{background:var(--gris-claro)}
.bg-dark{background:var(--grafito);color:#dfe4ec}
.bg-dark h2,.bg-dark h3{color:#fff}
.bg-blue{background:linear-gradient(135deg,var(--azul) 0%,#08254f 100%);color:#e8eefb}
.bg-blue h2,.bg-blue h3{color:#fff}
.center{text-align:center}
.center .lead{margin-left:auto;margin-right:auto}
.grid{display:grid;gap:26px}
.split{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}

/* ---------- Botones ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.6rem;
  padding:15px 30px;border-radius:100px;font-weight:600;font-size:.98rem;
  transition:all .4s var(--ease);cursor:pointer;border:1.5px solid transparent;white-space:nowrap;
}
.btn svg{width:18px;height:18px;transition:transform .4s var(--ease)}
.btn:hover svg{transform:translateX(4px)}
.btn--primary{background:var(--azul);color:#fff;box-shadow:0 12px 30px rgba(10,47,107,.28)}
.btn--primary:hover{background:var(--azul-electrico);transform:translateY(-3px);box-shadow:0 18px 40px rgba(30,107,255,.35)}
.btn--ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.5)}
.btn--ghost:hover{background:rgba(255,255,255,.12);border-color:#fff;transform:translateY(-3px)}
.btn--dark{background:transparent;color:var(--azul);border-color:var(--gris-borde)}
.btn--dark:hover{border-color:var(--azul);transform:translateY(-3px)}

/* ---------- Navbar ---------- */
.nav{
  position:fixed;top:0;left:0;width:100%;z-index:1000;
  transition:all .5s var(--ease);
  padding:20px 0;
}
.nav__inner{
  max-width:var(--ancho);margin:0 auto;padding:12px 26px;
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  border-radius:100px;transition:all .5s var(--ease);
}
.nav.scrolled{padding:12px 0}
.nav.scrolled .nav__inner{
  background:rgba(255,255,255,.72);
  backdrop-filter:blur(18px) saturate(180%);
  -webkit-backdrop-filter:blur(18px) saturate(180%);
  box-shadow:0 10px 40px rgba(10,47,107,.10);
  border:1px solid rgba(255,255,255,.6);
}
.nav__logo img{height:46px;width:auto;transition:height .4s var(--ease),filter .4s var(--ease)}
.nav.scrolled .nav__logo img{height:40px}
/* Logo blanco cuando el nav está transparente sobre el hero oscuro; a color al hacer scroll */
.nav.at-top:not(.forcelight) .nav__logo img{filter:brightness(0) invert(1)}
.nav__menu{display:flex;align-items:center;gap:4px}
.nav__menu a{
  font-size:.92rem;font-weight:500;color:var(--grafito);
  padding:9px 15px;border-radius:100px;transition:all .3s var(--ease);position:relative;
}
.nav.at-top:not(.forcelight) .nav__menu a,
.nav.at-top:not(.forcelight) .nav__cta.btn--dark{color:#fff}
.nav.at-top:not(.forcelight) .nav__cta.btn--dark{border-color:rgba(255,255,255,.45)}
.nav__menu a:hover{color:var(--azul-electrico);background:rgba(30,107,255,.08)}
.nav.at-top:not(.forcelight) .nav__menu a:hover{background:rgba(255,255,255,.15);color:#fff}
.nav__menu a.active{color:var(--azul-electrico)}
.nav__cta{padding:11px 22px;font-size:.9rem}
.nav__toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:8px}
.nav__toggle span{width:26px;height:2px;background:var(--grafito);transition:all .3s var(--ease);border-radius:2px}
.nav.at-top:not(.forcelight) .nav__toggle span{background:#fff}

/* ---------- Hero ---------- */
.hero{
  min-height:100vh;display:flex;align-items:center;position:relative;overflow:hidden;
  background:linear-gradient(120deg,#08254f 0%,var(--azul) 45%,#0d3a80 100%);
  color:#fff;
}
.hero__canvas{position:absolute;inset:0;z-index:0;opacity:.9}
.hero__overlay{
  position:absolute;inset:0;z-index:1;
  background:
    radial-gradient(1200px 600px at 75% 20%,rgba(30,107,255,.28),transparent 60%),
    radial-gradient(900px 500px at 10% 90%,rgba(122,122,122,.22),transparent 60%),
    linear-gradient(180deg,rgba(8,37,79,.35) 0%,rgba(8,37,79,.72) 100%);
}
.hero__inner{position:relative;z-index:2;max-width:var(--ancho);margin:0 auto;padding:120px 28px 80px;width:100%}
.hero__logo{height:96px;width:auto;margin-bottom:34px;filter:brightness(0) invert(1)}
.hero h1{color:#fff;max-width:16ch}
.hero h1 .accent{background:linear-gradient(90deg,#7fb0ff,#1E6BFF);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.hero__sub{font-size:clamp(1.05rem,1.7vw,1.35rem);color:#cfdcf5;max-width:62ch;margin:26px 0 40px;font-weight:300}
.hero__cta{display:flex;gap:16px;flex-wrap:wrap}
.hero__scroll{position:absolute;bottom:30px;left:50%;transform:translateX(-50%);z-index:2;color:#cfdcf5;font-size:.75rem;letter-spacing:.2em;text-transform:uppercase;display:flex;flex-direction:column;align-items:center;gap:10px}
.hero__scroll span{width:1px;height:44px;background:linear-gradient(#cfdcf5,transparent);animation:scrolldot 2s infinite}
@keyframes scrolldot{0%{opacity:0;transform:scaleY(.2)}50%{opacity:1}100%{opacity:0;transform:scaleY(1)}}

/* ---------- Reveal ---------- */
.reveal{opacity:0;transform:translateY(38px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal.d1{transition-delay:.1s}.reveal.d2{transition-delay:.2s}
.reveal.d3{transition-delay:.3s}.reveal.d4{transition-delay:.4s}

/* ---------- Tarjetas servicios ---------- */
.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:24px}
.card{
  background:#fff;border:1px solid var(--gris-borde);border-radius:var(--radio);
  padding:38px 32px;transition:all .5s var(--ease);position:relative;overflow:hidden;
}
.card::before{content:"";position:absolute;left:0;top:0;height:4px;width:0;background:linear-gradient(90deg,var(--azul),var(--azul-electrico));transition:width .5s var(--ease)}
.card:hover{transform:translateY(-8px);box-shadow:var(--sombra);border-color:transparent}
.card:hover::before{width:100%}
.card__ico{
  width:60px;height:60px;border-radius:16px;display:grid;place-items:center;margin-bottom:22px;
  background:linear-gradient(135deg,rgba(10,47,107,.08),rgba(30,107,255,.10));color:var(--azul);
}
.card__ico svg{width:30px;height:30px}
.card h3{margin-bottom:12px;font-size:1.3rem}
.card p{color:var(--gris);font-size:.98rem}
.card ul.tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.card ul.tags li{font-size:.78rem;color:var(--azul);background:rgba(10,47,107,.06);padding:5px 12px;border-radius:100px}

/* ---------- Cifras ---------- */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:20px;text-align:center}
.stat{padding:26px 16px}
.stat__num{font-size:clamp(2.6rem,5vw,4rem);font-weight:800;color:#fff;line-height:1;letter-spacing:-.03em}
.stat__num .plus{color:var(--azul-electrico)}
.stat__label{margin-top:10px;font-size:.9rem;color:#aeb9cd;letter-spacing:.03em}

/* ---------- Split media ---------- */
.media{border-radius:var(--radio);overflow:hidden;box-shadow:var(--sombra);position:relative;aspect-ratio:4/3;background:linear-gradient(135deg,#0d3a80,#08254f)}
.media--tall{aspect-ratio:3/4}
.media__badge{position:absolute;left:22px;bottom:22px;background:rgba(255,255,255,.92);backdrop-filter:blur(10px);padding:14px 20px;border-radius:14px;box-shadow:var(--sombra)}
.media__badge b{color:var(--azul);font-size:1.6rem;display:block;line-height:1}
.media__badge span{font-size:.8rem;color:var(--gris)}

/* Ilustración SVG dentro de media */
.media svg{width:100%;height:100%}

/* ---------- Lista de valores ---------- */
.valuelist{display:grid;gap:2px}
.valueitem{display:flex;gap:20px;padding:22px 0;border-bottom:1px solid var(--gris-borde)}
.valueitem__n{font-family:var(--sans);font-weight:800;color:var(--azul-electrico);font-size:1.1rem;min-width:44px}
.valueitem h4{color:var(--azul);font-size:1.1rem;margin-bottom:4px}
.valueitem p{color:var(--gris);font-size:.96rem}

/* ---------- Timeline ---------- */
.timeline{position:relative;margin-top:40px;padding-left:30px}
.timeline::before{content:"";position:absolute;left:0;top:6px;bottom:6px;width:2px;background:linear-gradient(var(--azul),var(--azul-electrico),transparent)}
.tl{position:relative;padding:0 0 38px 34px}
.tl::before{content:"";position:absolute;left:-6px;top:4px;width:14px;height:14px;border-radius:50%;background:#fff;border:3px solid var(--azul-electrico)}
.tl .year{font-weight:800;color:var(--azul-electrico);font-size:.9rem;letter-spacing:.05em}
.tl h4{color:var(--azul);margin:4px 0 6px}
.tl p{color:var(--gris);font-size:.95rem}

/* ---------- Proyectos ---------- */
.projects{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:26px}
.project{border-radius:var(--radio);overflow:hidden;position:relative;min-height:380px;display:flex;align-items:flex-end;color:#fff;box-shadow:var(--sombra);transition:transform .5s var(--ease)}
.project:hover{transform:translateY(-8px)}
.project__bg{position:absolute;inset:0;z-index:0;transition:transform .8s var(--ease)}
.project:hover .project__bg{transform:scale(1.06)}
.project__grad{position:absolute;inset:0;z-index:1;background:linear-gradient(180deg,transparent 30%,rgba(8,25,55,.92) 100%)}
.project__body{position:relative;z-index:2;padding:30px}
.project__cat{font-size:.75rem;letter-spacing:.15em;text-transform:uppercase;color:#8fb4ff;font-weight:700}
.project h3{color:#fff;margin:8px 0;font-size:1.35rem}
.project p{color:#c9d5ea;font-size:.92rem}
.project .link{margin-top:14px;display:inline-flex;align-items:center;gap:8px;color:#fff;font-weight:600;font-size:.9rem}
.project .link svg{width:16px;height:16px;transition:transform .4s}
.project:hover .link svg{transform:translateX(5px)}

/* ---------- Sectores ---------- */
.sectors{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:1px;background:var(--gris-borde);border:1px solid var(--gris-borde);border-radius:var(--radio);overflow:hidden}
.sector{background:#fff;padding:34px 26px;transition:all .4s var(--ease);cursor:default}
.sector:hover{background:var(--azul);color:#fff}
.sector__ico{width:44px;height:44px;color:var(--azul);margin-bottom:16px;transition:color .4s}
.sector:hover .sector__ico{color:#fff}
.sector h4{color:var(--azul);font-size:1.1rem;transition:color .4s}
.sector:hover h4{color:#fff}
.sector p{font-size:.9rem;color:var(--gris);margin-top:6px;transition:color .4s}
.sector:hover p{color:#cfe0ff}

/* ---------- Clientes ---------- */
.clients{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:20px;align-items:center}
.client{height:88px;display:grid;place-items:center;border:1px solid var(--gris-borde);border-radius:14px;color:var(--gris);font-weight:700;letter-spacing:.03em;transition:all .4s var(--ease);text-align:center;padding:10px}
.client:hover{color:var(--azul);border-color:var(--azul);box-shadow:var(--sombra);transform:translateY(-4px)}

/* ---------- Noticias ---------- */
.posts{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:26px}
.post{background:#fff;border:1px solid var(--gris-borde);border-radius:var(--radio);overflow:hidden;transition:all .5s var(--ease)}
.post:hover{transform:translateY(-6px);box-shadow:var(--sombra)}
.post__img{aspect-ratio:16/10;background:linear-gradient(135deg,#12408c,#08254f);position:relative}
.post__img .tag{position:absolute;left:16px;top:16px;background:#fff;color:var(--azul);font-size:.72rem;font-weight:700;padding:5px 12px;border-radius:100px;letter-spacing:.05em}
.post__body{padding:26px}
.post__date{font-size:.8rem;color:var(--gris-2);letter-spacing:.05em}
.post h3{font-size:1.15rem;margin:8px 0 10px}
.post p{font-size:.92rem;color:var(--gris)}

/* ---------- CTA band ---------- */
.ctaband{text-align:center}
.ctaband h2{color:#fff;max-width:20ch;margin:0 auto 18px}
.ctaband p{color:#cfdcf5;max-width:56ch;margin:0 auto 34px}

/* ---------- Contacto / Form ---------- */
.contact{display:grid;grid-template-columns:1fr 1.1fr;gap:56px;align-items:start}
.contact__info h2{margin-bottom:18px}
.contact__row{display:flex;gap:16px;padding:18px 0;border-bottom:1px solid var(--gris-borde);align-items:flex-start}
.contact__row svg{width:22px;height:22px;color:var(--azul-electrico);flex-shrink:0;margin-top:3px}
.contact__row b{display:block;color:var(--azul);font-size:1rem}
.contact__row span{color:var(--gris);font-size:.95rem}
.form{background:#fff;border:1px solid var(--gris-borde);border-radius:var(--radio);padding:38px;box-shadow:var(--sombra)}
.field{margin-bottom:18px}
.field label{display:block;font-size:.85rem;font-weight:600;color:var(--azul);margin-bottom:8px}
.field input,.field textarea,.field select{
  width:100%;padding:14px 16px;border:1.5px solid var(--gris-borde);border-radius:12px;
  font-family:inherit;font-size:.98rem;color:var(--grafito);background:var(--gris-claro);transition:all .3s;
}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--azul-electrico);background:#fff;box-shadow:0 0 0 4px rgba(30,107,255,.10)}
.field textarea{resize:vertical;min-height:120px}
.form__note{font-size:.82rem;color:var(--gris-2);margin-top:14px;text-align:center}

/* ---------- Footer ---------- */
.footer{background:var(--grafito-2);color:#aeb6c4;padding:80px 0 30px}
.footer__grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1.2fr;gap:40px;margin-bottom:50px}
.footer__logo{height:52px;filter:brightness(0) invert(1);margin-bottom:20px}
.footer p{font-size:.92rem;color:#8a93a3;max-width:34ch}
.footer h4{color:#fff;font-size:.85rem;letter-spacing:.12em;text-transform:uppercase;margin-bottom:18px}
.footer ul li{margin-bottom:11px}
.footer ul a{font-size:.92rem;color:#aeb6c4;transition:color .3s}
.footer ul a:hover{color:#fff}
.footer__social{display:flex;gap:12px;margin-top:20px}
.footer__social a{width:40px;height:40px;border-radius:10px;display:grid;place-items:center;background:rgba(255,255,255,.06);transition:all .3s}
.footer__social a:hover{background:var(--azul-electrico)}
.footer__social svg{width:18px;height:18px;color:#fff}
.footer__bottom{border-top:1px solid rgba(255,255,255,.08);padding-top:26px;display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:.85rem;color:#6f7787}

/* ---------- WhatsApp flotante ---------- */
.wa{position:fixed;right:24px;bottom:24px;z-index:900;width:60px;height:60px;border-radius:50%;background:#25D366;display:grid;place-items:center;box-shadow:0 12px 30px rgba(37,211,102,.4);transition:transform .3s var(--ease);animation:wapulse 2.4s infinite}
.wa:hover{transform:scale(1.1)}
.wa svg{width:32px;height:32px;color:#fff}
@keyframes wapulse{0%{box-shadow:0 12px 30px rgba(37,211,102,.4),0 0 0 0 rgba(37,211,102,.5)}70%{box-shadow:0 12px 30px rgba(37,211,102,.4),0 0 0 16px rgba(37,211,102,0)}100%{box-shadow:0 12px 30px rgba(37,211,102,.4),0 0 0 0 rgba(37,211,102,0)}}

/* ---------- Page hero (internas) ---------- */
.phero{background:linear-gradient(120deg,#08254f,var(--azul));color:#fff;padding:170px 0 90px;position:relative;overflow:hidden}
.phero::after{content:"";position:absolute;inset:0;background:radial-gradient(800px 400px at 80% 10%,rgba(30,107,255,.28),transparent 60%)}
.phero__inner{position:relative;z-index:2;max-width:var(--ancho);margin:0 auto;padding:0 28px}
.phero h1{color:#fff;max-width:18ch}
.phero p{color:#cfdcf5;max-width:60ch;margin-top:20px;font-size:1.15rem;font-weight:300}
.crumbs{font-size:.85rem;color:#9fb5df;margin-bottom:20px;letter-spacing:.03em}
.crumbs a:hover{color:#fff}

/* ---------- Responsive ---------- */
@media(max-width:980px){
  .split,.contact{grid-template-columns:1fr;gap:36px}
  .footer__grid{grid-template-columns:1fr 1fr;gap:32px}
}
@media(max-width:860px){
  .nav__menu{
    position:fixed;top:0;right:0;height:100vh;width:min(320px,82vw);
    background:#fff;flex-direction:column;align-items:flex-start;justify-content:center;
    padding:40px;gap:6px;transform:translateX(100%);transition:transform .5s var(--ease);
    box-shadow:-20px 0 60px rgba(0,0,0,.2);
  }
  .nav__menu.open{transform:translateX(0)}
  .nav__menu a{color:var(--grafito)!important;font-size:1.1rem;width:100%}
  .nav__cta{margin-top:14px}
  .nav__toggle{display:flex;z-index:1002}
  .nav__toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg);background:var(--grafito)}
  .nav__toggle.open span:nth-child(2){opacity:0}
  .nav__toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg);background:var(--grafito)}
  .hero__logo{height:72px}
}
@media(max-width:560px){
  body{font-size:16px}
  .footer__grid{grid-template-columns:1fr}
  .footer__bottom{flex-direction:column;gap:10px}
  .hero__cta{flex-direction:column}
  .hero__cta .btn{width:100%;justify-content:center}
}