:root{--bg:#fff;--alt:#f3f5f7;--ink:#14202b;--mut:#5b6875;--line:#e1e6eb;--eng:#0f4c75;--arq:#b8793a;--acc:#0f4c75;--r:14px}
@media (prefers-color-scheme:dark){:root{--bg:#0e151c;--alt:#141d26;--ink:#e8edf2;--mut:#9aa7b4;--line:#243140;--acc:#4aa3d9}}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font:16px/1.6 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;color:var(--ink);background:var(--bg)}
.wrap{max-width:1100px;margin:0 auto;padding:0 20px}
h1,h2,h3{line-height:1.15;margin:0}
a{color:inherit}
.preview-bar{background:#14202b;color:#fff;font-size:13px;text-align:center;padding:6px 10px}
.nav{position:sticky;top:0;z-index:10;display:flex;align-items:center;justify-content:space-between;padding:12px 20px;background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;font-weight:700;text-decoration:none}
.brand small{font-weight:400;color:var(--mut);display:none}
.mark{display:grid;place-items:center;width:34px;height:34px;border-radius:8px;background:linear-gradient(135deg,var(--eng),var(--arq));color:#fff}
nav{display:flex;gap:6px;align-items:center}
nav a{text-decoration:none;padding:8px 12px;border-radius:8px;color:var(--mut);font-size:15px}
nav a:hover{color:var(--ink);background:var(--alt)}
nav a.cta{background:var(--acc);color:#fff}
.burger{display:none;background:none;border:1px solid var(--line);color:var(--ink);border-radius:8px;padding:6px 12px;font-size:20px}
.hero{padding:88px 0 56px;background:radial-gradient(900px 400px at 85% -10%,color-mix(in srgb,var(--arq) 22%,transparent),transparent),radial-gradient(800px 400px at 0% 0%,color-mix(in srgb,var(--eng) 22%,transparent),transparent)}
.eyebrow{color:var(--acc);font-weight:600;letter-spacing:.08em;text-transform:uppercase;font-size:13px;margin:0 0 14px}
.hero h1{font-size:clamp(34px,6vw,60px);letter-spacing:-.02em}
.lead{max-width:620px;color:var(--mut);font-size:18px;margin:20px 0 28px}
.actions{display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-block;border:0;cursor:pointer;font:inherit;font-weight:600;background:var(--acc);color:#fff;padding:12px 22px;border-radius:10px;text-decoration:none}
.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}
.stats{display:flex;gap:36px;flex-wrap:wrap;list-style:none;padding:0;margin:44px 0 0;color:var(--mut)}
.stats b{display:block;font-size:30px;color:var(--ink)}
.split{display:grid;grid-template-columns:1fr 1fr}
.branch{padding:56px 8vw;text-decoration:none;color:#fff;display:flex;flex-direction:column;gap:10px;transition:filter .2s}
.branch:hover{filter:brightness(1.1)}
.branch.eng{background:linear-gradient(135deg,#0b3a5a,#1b6aa0)}
.branch.arq{background:linear-gradient(135deg,#8c5a28,#d29a5e)}
.branch h2{font-size:34px}
.branch p{margin:0;max-width:380px;opacity:.92}
.tag{font-size:12px;letter-spacing:.1em;text-transform:uppercase;opacity:.8}
.more{margin-top:8px;font-weight:600}
.block{padding:72px 20px}
.block.alt{background:var(--alt)}
.title{font-size:clamp(26px,4vw,38px);margin-bottom:28px}
.grid3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.card{border:1px solid var(--line);border-radius:var(--r);padding:24px;background:var(--bg)}
.card i{font-style:normal;color:var(--acc);font-weight:700}
.card h3{margin:8px 0}
.card p{margin:0;color:var(--mut)}
.filters{display:flex;gap:8px;margin-bottom:22px;flex-wrap:wrap}
.filters button{font:inherit;background:var(--bg);color:var(--ink);border:1px solid var(--line);padding:8px 18px;border-radius:999px;cursor:pointer}
.filters button.on{background:var(--acc);border-color:var(--acc);color:#fff}
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.proj{border-radius:var(--r);overflow:hidden;border:1px solid var(--line);background:var(--bg)}
.proj .img{aspect-ratio:4/3;display:flex;align-items:flex-end;padding:14px;color:#fff;font-weight:700;font-size:13px;letter-spacing:.06em;text-transform:uppercase}
.proj.ingenieria .img{background:linear-gradient(160deg,#0b3a5a,#3a8fc7)}
.proj.arquitectura .img{background:linear-gradient(160deg,#8c5a28,#e0b27c)}
.proj .txt{padding:16px}
.proj h3{font-size:18px}
.proj p{margin:6px 0 0;color:var(--mut);font-size:14px}
.about{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.checks{padding-left:20px;color:var(--mut)}
.values{display:grid;gap:12px}
.values div{border:1px solid var(--line);border-radius:var(--r);padding:18px;display:flex;flex-direction:column;background:var(--bg)}
.values span{color:var(--mut)}
.info{color:var(--mut)}
form{display:grid;gap:14px}
label{display:grid;gap:6px;font-weight:600;font-size:14px}
input,select,textarea{font:inherit;padding:11px 12px;border:1px solid var(--line);border-radius:10px;background:var(--bg);color:var(--ink)}
input:focus,select:focus,textarea:focus{outline:2px solid var(--acc);outline-offset:1px}
.ok{color:#1d7a46;margin:0}
footer{border-top:1px solid var(--line);padding:22px 0;color:var(--mut);font-size:14px}
footer .wrap{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap}
@media (max-width:820px){
  .grid3,.gallery{grid-template-columns:1fr 1fr}
  .split,.about{grid-template-columns:1fr}
  .burger{display:block}
  nav{display:none;position:absolute;left:0;right:0;top:100%;flex-direction:column;align-items:stretch;background:var(--bg);padding:12px 20px;border-bottom:1px solid var(--line)}
  nav.open{display:flex}
  .hero{padding-top:56px}
}
@media (max-width:540px){.grid3,.gallery{grid-template-columns:1fr}}
@media (min-width:1000px){.brand small{display:inline}}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}