:root{
  --navy:#03305B; --deep:#011C36; --green:#73B839; --green-d:#5e9a2c;
  --light:#EEEEEE; --text:#1d2a36; --muted:#5a6773; --white:#fff;
  --wrap:1180px; --radius:6px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{font-family:Inter,Arial,sans-serif;color:var(--text);line-height:1.6;background:#fff}
img{max-width:100%;display:block}
a{color:inherit}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 24px}
.center{text-align:center;margin-top:40px}

/* header */
.site-header{position:fixed;top:0;left:0;right:0;z-index:50;background:var(--navy);box-shadow:0 2px 12px rgba(0,0,0,.2)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.logo svg{display:block}
.main-nav ul{display:flex;gap:32px;list-style:none}
.main-nav a{color:#fff;text-decoration:none;font-size:13px;font-weight:600;letter-spacing:1.5px;transition:color .2s}
.main-nav a:hover,.main-nav a.active{color:var(--green)}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;width:32px;height:24px;flex-direction:column;justify-content:space-between}
.nav-toggle span{display:block;height:3px;background:#fff;border-radius:2px}

/* buttons */
.btn{display:inline-block;background:var(--green);color:#fff;text-decoration:none;font-weight:700;font-size:13px;letter-spacing:1.5px;padding:14px 36px;border-radius:32px;border:0;cursor:pointer;transition:background .2s,transform .2s}
.btn:hover{background:var(--green-d);transform:translateY(-1px)}

/* hero */
.hero{position:relative;height:100vh;min-height:560px;max-height:900px;display:flex;align-items:center;color:#fff;overflow:hidden;background:var(--navy)}
.slides,.slide,.hero-shade{position:absolute;inset:0}
.slide{background-size:cover;background-position:center;opacity:0;transition:opacity 1.2s ease}
.slide.active{opacity:1}
.hero-shade{background:linear-gradient(90deg,rgba(1,28,54,.85) 0%,rgba(1,28,54,.55) 55%,rgba(1,28,54,.25) 100%)}
.hero-content{position:relative;z-index:2;padding-top:72px}
.hero h1{font-weight:300;font-size:clamp(34px,5vw,58px);line-height:1.15;margin-bottom:24px}
.hero p{max-width:620px;font-size:clamp(15px,1.4vw,19px);margin-bottom:32px;font-weight:500}
.hero-nav{position:absolute;top:50%;z-index:3;transform:translateY(-50%);background:rgba(255,255,255,.85);color:var(--navy);border:0;width:40px;height:40px;border-radius:50%;font-size:26px;line-height:1;cursor:pointer}
.hero-nav.prev{left:20px}.hero-nav.next{right:20px}

/* sections */
.sec{padding:90px 0}
.sec h2{font-size:clamp(28px,3vw,36px);font-weight:700;color:#fff;margin-bottom:48px}
.sec h2.title-dark{color:var(--navy)}
.dark{background:var(--deep);color:#fff}
.light{background:var(--light)}

/* por qué */
.pq-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:56px 64px}
.pq-item{display:flex;gap:24px;align-items:flex-start}
.pq-num{font-size:110px;font-weight:800;color:var(--green);line-height:.85}
.pq-item h3{color:var(--green);font-size:18px;font-weight:700;letter-spacing:.5px;margin-bottom:10px}
.pq-item p{font-size:15px;color:#e6edf3}
.pq-item strong{color:#fff}

/* productos */
.prod-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.prod-card{position:relative;display:block;aspect-ratio:600/358;overflow:hidden;background:#000;text-decoration:none;color:#fff}
.prod-card img{width:100%;height:100%;object-fit:cover;transition:transform .6s,opacity .4s;opacity:.6}
.prod-card:hover img{transform:scale(1.05);opacity:.45}
.prod-overlay{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:24px}
.prod-overlay h3{font-size:clamp(16px,1.8vw,22px);font-weight:700;letter-spacing:.5px}
.prod-overlay p{font-size:14px;margin-top:6px}
.ver{display:inline-block;margin-top:28px;font-size:13px;font-weight:700;letter-spacing:3px;border-bottom:2px solid currentColor;padding-bottom:2px}

/* servicios */
.serv-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.serv-card{background:#fff;text-decoration:none;color:var(--text);display:flex;flex-direction:column;box-shadow:0 2px 10px rgba(0,0,0,.06);transition:box-shadow .3s,transform .3s}
.serv-card:hover{box-shadow:0 10px 24px rgba(0,0,0,.12);transform:translateY(-3px)}
.serv-img{aspect-ratio:373/276;overflow:hidden}
.serv-img img{width:100%;height:100%;object-fit:cover}
.serv-body{padding:22px 24px 28px;text-align:center;display:flex;flex-direction:column;flex:1}
.serv-body h3{color:var(--navy);font-size:16px;font-weight:700;letter-spacing:.5px;margin-bottom:10px}
.serv-body p{font-size:14px;color:var(--muted);flex:1}
.serv-body .ver{color:var(--green);align-self:center;margin-top:18px}

/* galerías */
.gallery{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:10px}
.g-item{display:block;aspect-ratio:4/3;overflow:hidden;background:#ddd}
.g-item img{width:100%;height:100%;object-fit:cover;transition:transform .5s}
.g-item:hover img{transform:scale(1.06)}

/* stats */
.stats{background:var(--deep);color:#fff;padding:70px 0;border-top:1px solid rgba(255,255,255,.08)}
.stats-grid{display:grid;grid-template-columns:repeat(3,1fr);text-align:center;gap:24px}
.stats strong{display:block;font-size:clamp(34px,4vw,48px);font-weight:800;color:#fff}
.stats span{display:block;color:var(--green);font-weight:700;letter-spacing:2px;font-size:14px;margin-top:6px}

/* clientes */
#clientes h2{text-align:center}
.marquee{overflow:hidden;mask-image:linear-gradient(90deg,transparent,#000 8%,#000 92%,transparent)}
.marquee-track{display:flex;gap:20px;width:max-content;animation:scroll 40s linear infinite}
.marquee:hover .marquee-track{animation-play-state:paused}
.logo-item{background:#fff;width:220px;height:165px;display:flex;align-items:center;justify-content:center;padding:20px;flex:none}
.logo-item img{max-height:100%;object-fit:contain}
@keyframes scroll{to{transform:translateX(calc(-50% - 10px))}}

/* contacto */
.contact-grid{display:grid;grid-template-columns:1fr 1.4fr;gap:60px}
.contact-info h2{margin-bottom:20px}
.contact-info h4{color:var(--navy);font-size:14px;letter-spacing:1.5px;margin:22px 0 4px}
.contact-info a{text-decoration:none}
.contact-info a:hover{color:var(--green)}
.contact-form{background:#fff;padding:36px;display:flex;flex-direction:column;gap:18px;box-shadow:0 2px 10px rgba(0,0,0,.06)}
.contact-form label{display:flex;flex-direction:column;font-size:13px;font-weight:600;color:var(--navy);gap:6px;flex:1}
.contact-form input,.contact-form textarea{font:inherit;font-weight:400;border:0;border-bottom:1px solid #b9c2cb;padding:8px 2px;outline:none;background:transparent;color:var(--text)}
.contact-form input:focus,.contact-form textarea:focus{border-color:var(--green)}
.row2{display:flex;gap:24px}
.contact-form .btn{align-self:flex-end}
.hp{position:absolute;left:-9999px}
.form-msg{font-size:14px}
.form-msg.ok{color:var(--green-d)}.form-msg.err{color:#c0392b}

/* detalle */
.detail{padding-top:72px}
.detail-head{background:var(--navy);color:#fff;padding:70px 0 50px}
.detail-head h1{font-size:clamp(26px,3.4vw,40px);font-weight:700;line-height:1.2}
.detail-head .lead{color:var(--green);font-weight:600;margin-top:10px;font-size:18px}
.detail-desc{font-size:17px;max-width:820px;margin-bottom:36px}
.back{margin-top:40px}
.back a{color:var(--green);font-weight:700;text-decoration:none;letter-spacing:1px;text-transform:uppercase;font-size:14px}
.karin-sec{padding:80px 0}
.karin-grid{display:grid;grid-template-columns:1.2fr 1fr;gap:56px;align-items:center}
.karin-grid h1{color:var(--navy);font-size:clamp(26px,3vw,36px);margin-bottom:16px}
.karin-grid .lead{font-weight:600;color:var(--navy);margin-bottom:16px}
.karin-grid p{margin-bottom:24px}

/* footer */
.site-footer{background:var(--navy);color:#dfe7ef;padding:60px 0 0;font-size:14px}
.footer-grid{display:grid;grid-template-columns:1fr 1.3fr 1.3fr;gap:40px}
.footer-brand{display:flex;flex-direction:column;gap:24px;align-items:flex-start}
.karin{color:#fff;font-weight:700;letter-spacing:1px;font-size:13px;border:1px solid var(--green);padding:10px 16px;border-radius:24px;text-decoration:none}
.karin:hover{background:var(--green)}
.footer-col h4{color:var(--green);letter-spacing:1px;font-size:14px;margin-bottom:14px;text-transform:uppercase}
.footer-col p{margin-bottom:10px}
.footer-col span{display:block;color:#fff;font-weight:700;font-size:12px;letter-spacing:1px;text-transform:uppercase}
.footer-col a{text-decoration:none}.footer-col a:hover{color:var(--green)}
.copy{text-align:center;padding:22px;margin-top:40px;border-top:1px solid rgba(255,255,255,.1);font-size:12px;color:#9fb0c2}

/* lightbox */
.lightbox{position:fixed;inset:0;background:rgba(0,0,0,.92);z-index:100;display:flex;align-items:center;justify-content:center}
.lightbox[hidden]{display:none}
.lightbox img{max-width:90vw;max-height:88vh;object-fit:contain}
.lightbox button{position:absolute;background:none;border:0;color:#fff;font-size:44px;cursor:pointer;padding:10px 18px}
.lb-close{top:10px;right:16px}.lb-prev{left:10px}.lb-next{right:10px}

/* responsive */
@media (max-width:960px){
  .main-nav{position:fixed;top:72px;left:0;right:0;background:var(--navy);max-height:0;overflow:hidden;transition:max-height .3s}
  .main-nav.open{max-height:420px}
  .main-nav ul{flex-direction:column;gap:0;padding:8px 24px 20px}
  .main-nav a{display:block;padding:12px 0;border-bottom:1px solid rgba(255,255,255,.08)}
  .nav-toggle{display:flex}
  .serv-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid,.contact-grid,.karin-grid{grid-template-columns:1fr}
}
@media (max-width:640px){
  .sec{padding:64px 0}
  .pq-grid,.prod-grid,.serv-grid{grid-template-columns:1fr}
  .pq-num{font-size:72px}
  .stats-grid{grid-template-columns:1fr}
  .row2{flex-direction:column}
  .hero-nav{display:none}
  .wrap{padding:0 16px}
  .contact-form{padding:24px}
}

/* carrusel proyectos */
.carousel-wrap{position:relative}
.gallery.carousel{display:flex;overflow-x:auto;scroll-snap-type:x mandatory;scroll-behavior:smooth;scrollbar-width:none;gap:12px}
.gallery.carousel::-webkit-scrollbar{display:none}
.gallery.carousel .g-item{flex:0 0 calc((100% - 36px)/4);aspect-ratio:3/4;scroll-snap-align:start}
.car-btn{position:absolute;top:50%;transform:translateY(-50%);z-index:2;width:44px;height:44px;border-radius:50%;border:0;background:var(--green);color:#fff;font-size:28px;line-height:1;cursor:pointer;box-shadow:0 2px 8px rgba(0,0,0,.25)}
.car-btn.prev{left:-18px}.car-btn.next{right:-18px}
@media (max-width:960px){.gallery.carousel .g-item{flex-basis:calc((100% - 12px)/2)}}
@media (max-width:640px){.gallery.carousel .g-item{flex-basis:80%}.car-btn.prev{left:-6px}.car-btn.next{right:-6px}}