/* =========================================================
   Tiller Construcciones — "Estructura" · taller metalúrgico
   Estructuras metálicas · Buenos Aires
   ========================================================= */

@import url('https://fonts.googleapis.com/css2?family=Chakra+Petch:wght@500;600;700&family=Barlow:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

:root{
  --steel:#111E26;
  --steel-2:#182A34;
  --steel-3:#21343E;
  --ink:#0C161C;
  --teal:#26B48C;
  --aqua:#2E93A8;
  --blue:#2F6E8F;
  --silver:#C7CFD4;
  --silver-d:#8A97A0;
  --paper:#EDF1F2;
  --paper-2:#FFFFFF;
  --line:#DBE1E3;
  --line-d:rgba(199,207,212,.15);
  --muted:#5E6B72;
  --muted-l:#93A0A7;

  --grad:linear-gradient(100deg,#26B48C 0%,#2E93A8 50%,#2F6E8F 100%);

  --disp:"Chakra Petch",system-ui,sans-serif;
  --body:"Barlow",system-ui,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,monospace;

  --r:12px;
  --r-sm:8px;
  --ease:cubic-bezier(.22,1,.36,1);
  --wrap:1180px;
  --shadow:0 26px 56px -28px rgba(6,18,26,.6);
  --shadow-sm:0 14px 30px -18px rgba(6,18,26,.45);
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{font-family:var(--body);background:var(--paper);color:var(--steel);line-height:1.62;
  overflow-x:hidden;font-size:16px;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
ul{list-style:none}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
:focus-visible{outline:3px solid var(--teal);outline-offset:3px;border-radius:4px}

.wrap{max-width:var(--wrap);margin:0 auto;padding:0 22px}

/* viga / beam divider · firma */
.beam{height:6px;background:var(--grad);border-radius:2px;position:relative}
.beam::before,.beam::after{content:"";position:absolute;top:50%;transform:translateY(-50%);width:5px;height:5px;border-radius:50%;background:rgba(255,255,255,.6)}
.beam::before{left:8px}.beam::after{right:8px}

.eyebrow{display:inline-flex;align-items:center;gap:.6em;font-family:var(--mono);font-weight:500;
  text-transform:uppercase;letter-spacing:.16em;font-size:.7rem;color:var(--blue)}
.eyebrow::before{content:"";width:20px;height:3px;background:var(--grad);border-radius:2px}
.s-dark .eyebrow{color:var(--teal)}

.s-head{max-width:640px;margin-bottom:40px}
.s-head h2{font-family:var(--disp);font-weight:700;letter-spacing:-.01em;line-height:1.04;text-transform:uppercase;
  font-size:clamp(2rem,4.6vw,3.1rem);margin:14px 0 12px}
.s-head h2 em{font-style:normal;color:var(--blue)}
.s-dark .s-head h2{color:var(--paper-2)}.s-dark .s-head h2 em{color:var(--teal)}
.s-head p{color:var(--muted);font-size:1.05rem;max-width:56ch}
.s-dark .s-head p{color:var(--muted-l)}

/* ===================== NAV ===================== */
.nav{position:fixed;inset:0 0 auto 0;z-index:80;padding:14px 0;transition:background .3s,padding .3s,box-shadow .3s}
.nav.scrolled{background:rgba(17,30,38,.94);backdrop-filter:blur(12px);padding:9px 0;box-shadow:0 10px 28px -16px rgba(0,0,0,.6)}
.nav-inner{max-width:var(--wrap);margin:0 auto;padding:0 22px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:11px}
.brand-chip{background:#F4F4F2;border-radius:11px;padding:8px 12px;display:grid;place-items:center;box-shadow:0 6px 16px -8px rgba(0,0,0,.5)}
.brand-chip img{height:48px;width:auto;display:block;transition:height .3s}
.nav.scrolled .brand-chip img{height:40px}
.brand-txt{display:none;font-family:var(--disp);font-weight:700;font-size:1.02rem;color:var(--paper);letter-spacing:.02em;text-transform:uppercase;line-height:.95}
.brand-txt span{display:block;font-family:var(--mono);font-size:.54rem;letter-spacing:.16em;color:var(--teal);margin-top:3px;font-weight:400}
.nav-links{display:none;align-items:center;gap:24px}
.nav-links a{color:rgba(237,241,242,.8);font-weight:600;font-size:.92rem;transition:color .2s}
.nav-links a:hover{color:var(--paper-2)}
.nav-cta{background:var(--grad);color:#fff!important;font-weight:700;padding:10px 18px;border-radius:8px;font-size:.9rem;transition:transform .2s,filter .2s}
.nav-cta:hover{transform:translateY(-2px);filter:brightness(1.08)}
.burger{display:flex;flex-direction:column;gap:5px;padding:8px}
.burger span{width:24px;height:2px;background:var(--paper);transition:.3s}
.burger.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.burger.open span:nth-child(2){opacity:0}
.burger.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.nav-mobile{position:fixed;inset:0;z-index:79;background:var(--ink);display:flex;flex-direction:column;
  justify-content:center;gap:4px;padding:32px;transform:translateX(100%);transition:transform .4s var(--ease)}
.nav-mobile.open{transform:none}
.nav-mobile a{font-family:var(--disp);font-weight:600;font-size:1.7rem;color:var(--paper);padding:12px 0;border-bottom:1px solid var(--line-d);text-transform:uppercase}
.nav-mobile a:last-child{border:none;margin-top:14px;text-align:center;background:var(--grad);border-radius:10px;padding:15px;font-size:1.2rem}

/* ===================== HERO ===================== */
.hero{position:relative;min-height:100vh;min-height:100svh;display:flex;align-items:flex-end;padding:120px 0 66px;overflow:hidden;background:var(--ink)}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0;opacity:.62}
.hero-veil{position:absolute;inset:0;z-index:1;pointer-events:none;background:
  linear-gradient(180deg,rgba(12,22,28,.7) 0%,rgba(12,22,28,.28) 32%,rgba(12,22,28,.72) 74%,rgba(12,22,28,.97) 100%),
  linear-gradient(90deg,rgba(12,22,28,.75),transparent 60%)}
.hero-inner{position:relative;z-index:3;width:100%}
.hero-eyebrow{color:var(--teal);margin-bottom:18px}
.hero h1{font-family:var(--disp);font-weight:700;text-transform:uppercase;letter-spacing:-.01em;line-height:1;color:var(--paper-2);
  font-size:clamp(2.4rem,6.6vw,4.8rem);max-width:16ch;text-shadow:0 4px 30px rgba(0,0,0,.5)}
.hero h1 em{font-style:normal;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{margin-top:18px;font-size:1.16rem;color:rgba(237,241,242,.9);max-width:48ch;text-shadow:0 1px 10px rgba(0,0,0,.5)}
.hero-actions{display:flex;flex-wrap:wrap;gap:13px;margin:28px 0 24px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:10px;font-weight:700;font-size:1rem;padding:15px 25px;border-radius:9px;
  transition:transform .2s var(--ease),box-shadow .25s,filter .2s,background .2s}
.btn svg{width:20px;height:20px}
.btn-grad{background:var(--grad);color:#fff}
.btn-grad:hover{transform:translateY(-3px);filter:brightness(1.08);box-shadow:0 16px 34px -14px rgba(46,147,168,.6)}
.btn-out{background:transparent;color:var(--paper-2);box-shadow:inset 0 0 0 1.5px rgba(237,241,242,.35)}
.btn-out:hover{box-shadow:inset 0 0 0 1.5px var(--paper-2);transform:translateY(-3px)}
.btn-steel{background:var(--steel);color:var(--paper)}
.btn-steel:hover{background:var(--steel-3);transform:translateY(-3px)}
.hero-trust{display:flex;flex-wrap:wrap;gap:8px 20px;font-family:var(--mono);font-size:.72rem;letter-spacing:.04em;text-transform:uppercase;color:rgba(237,241,242,.66)}
.hero-trust span{display:inline-flex;align-items:center;gap:7px}
.hero-trust span::before{content:"";width:6px;height:6px;background:var(--teal);transform:rotate(45deg)}

/* ===================== SECTION ===================== */
.section{padding:84px 0}
.s-dark{background:var(--steel);color:var(--paper)}
.s-paper{background:var(--paper)}
.s-white{background:var(--paper-2)}

/* ===================== SERVICIOS ===================== */
.serv-grid{display:grid;gap:16px;grid-template-columns:1fr}
.serv{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--r);padding:26px 24px;position:relative;overflow:hidden;
  transition:transform .28s var(--ease),box-shadow .28s,border-color .28s}
.serv::before{content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--grad);transform:scaleX(0);transform-origin:left;transition:transform .35s var(--ease)}
.serv:hover{transform:translateY(-6px);box-shadow:var(--shadow-sm);border-color:transparent}
.serv:hover::before{transform:none}
.serv-n{font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;color:var(--silver-d);position:absolute;top:22px;right:22px}
.serv-ico{width:48px;height:48px;border-radius:10px;background:var(--steel);color:var(--teal);display:grid;place-items:center;margin-bottom:16px}
.serv-ico svg{width:26px;height:26px;fill:none;stroke:currentColor;stroke-width:1.7}
.serv h3{font-family:var(--disp);font-weight:600;font-size:1.28rem;text-transform:uppercase;letter-spacing:.005em;margin-bottom:7px}
.serv p{color:var(--muted);font-size:.95rem;margin-bottom:14px}
.serv-tags{display:flex;flex-wrap:wrap;gap:6px}
.serv-tags li{font-family:var(--mono);font-size:.62rem;letter-spacing:.03em;text-transform:uppercase;color:var(--blue);background:rgba(46,147,168,.1);padding:5px 9px;border-radius:5px}
.serv-go{position:absolute;bottom:22px;right:22px;font-family:var(--mono);font-size:.7rem;letter-spacing:.06em;text-transform:uppercase;color:var(--teal);opacity:0;transform:translateX(-6px);transition:.25s}
.serv:hover .serv-go{opacity:1;transform:none}

/* ===================== IDEAL PARA (band) ===================== */
.band{background:var(--grad);color:#fff}
.band-inner{max-width:var(--wrap);margin:0 auto;padding:26px 22px;display:flex;flex-wrap:wrap;gap:14px 34px;align-items:center;justify-content:center}
.band-inner b{font-family:var(--disp);font-weight:700;text-transform:uppercase;letter-spacing:.02em;font-size:1.05rem;display:inline-flex;align-items:center;gap:10px}
.band-inner b::before{content:"";width:7px;height:7px;background:#fff;transform:rotate(45deg)}

/* ===================== PROCESO ===================== */
.proc-grid{display:grid;gap:0;grid-template-columns:1fr}
.proc{display:grid;grid-template-columns:auto 1fr;gap:20px;padding:22px 0;border-top:1px solid var(--line-d)}
.proc:last-child{border-bottom:1px solid var(--line-d)}
.proc-n{font-family:var(--disp);font-weight:700;font-size:1.5rem;color:transparent;background:var(--grad);-webkit-background-clip:text;background-clip:text;line-height:1}
.proc h3{font-family:var(--disp);font-weight:600;font-size:1.3rem;text-transform:uppercase;margin-bottom:5px;color:var(--paper-2)}
.proc p{color:rgba(237,241,242,.72);font-size:.98rem;max-width:60ch}

/* ===================== GALERÍA ===================== */
.gal{display:grid;gap:12px;grid-template-columns:repeat(2,1fr)}
.gal button{position:relative;border-radius:var(--r-sm);overflow:hidden;aspect-ratio:4/3;background:var(--steel-2)}
.gal button:nth-child(1){grid-column:1/-1;aspect-ratio:16/9}
.gal img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.gal button:hover img{transform:scale(1.06)}
.gal button::after{content:"";position:absolute;inset:0;background:linear-gradient(transparent 55%,rgba(12,22,28,.5));opacity:0;transition:opacity .3s}
.gal button:hover::after{opacity:1}

.lb{position:fixed;inset:0;z-index:130;display:none;align-items:center;justify-content:center;padding:24px;background:rgba(8,14,18,.93)}
.lb.open{display:flex}
.lb img{max-width:100%;max-height:88vh;border-radius:8px;box-shadow:0 30px 80px -20px #000}
.lb-close{position:absolute;top:18px;right:18px;width:46px;height:46px;border-radius:50%;background:rgba(237,241,242,.12);display:grid;place-items:center;transition:.2s}
.lb-close:hover{background:var(--teal);color:var(--ink);transform:rotate(90deg)}
.lb-close svg{width:20px;height:20px;stroke:currentColor;stroke-width:2;fill:none}

/* ===================== WHY ===================== */
.why-grid{display:grid;gap:16px;grid-template-columns:1fr}
.why{background:var(--paper-2);border:1px solid var(--line);border-radius:var(--r);padding:22px;display:flex;gap:14px;align-items:flex-start}
.why-ico{flex:0 0 40px;width:40px;height:40px;border-radius:9px;background:var(--grad);color:#fff;display:grid;place-items:center}
.why-ico svg{width:21px;height:21px;fill:none;stroke:currentColor;stroke-width:2}
.why b{font-family:var(--disp);font-weight:600;text-transform:uppercase;font-size:1.05rem;display:block;margin-bottom:4px}
.why span{color:var(--muted);font-size:.93rem}

/* ===================== CTA ===================== */
.cta{background:var(--steel);border-radius:16px;padding:52px 32px;text-align:center;position:relative;overflow:hidden}
.cta::before{content:"";position:absolute;top:0;left:0;right:0;height:6px;background:var(--grad)}
.cta h2{font-family:var(--disp);font-weight:700;text-transform:uppercase;font-size:clamp(1.9rem,4.6vw,3rem);color:var(--paper-2);line-height:1.04}
.cta p{color:var(--muted-l);margin:12px auto 26px;max-width:48ch}

/* ===================== FOOTER ===================== */
.footer{background:var(--ink);color:var(--paper);padding:54px 0 28px}
.footer-grid{display:grid;gap:28px;grid-template-columns:1fr}
.footer-brand .brand-chip{width:max-content}
.footer-brand p{color:var(--muted-l);max-width:34ch;margin-top:14px;font-size:.94rem}
.footer h4{font-family:var(--mono);font-size:.7rem;letter-spacing:.13em;text-transform:uppercase;color:var(--teal);margin-bottom:13px}
.footer a{display:block;color:rgba(237,241,242,.72);padding:5px 0;transition:color .2s}
.footer a:hover{color:var(--paper-2)}
.footer-bottom{border-top:1px solid var(--line-d);margin-top:32px;padding-top:22px;display:flex;flex-wrap:wrap;gap:10px;
  justify-content:space-between;font-family:var(--mono);font-size:.68rem;letter-spacing:.04em;text-transform:uppercase;color:var(--muted-l)}

/* ===================== WA FLOAT ===================== */
.wa{position:fixed;right:18px;bottom:18px;z-index:90;width:56px;height:56px;border-radius:50%;background:#25d366;color:#fff;
  display:grid;place-items:center;box-shadow:0 14px 32px -10px rgba(37,211,102,.7);transform:translateY(110px);transition:transform .35s var(--ease)}
.wa.show{transform:none}
.wa:hover{transform:scale(1.08)}
.wa svg{width:30px;height:30px;fill:currentColor}

/* ===================== REVEAL ===================== */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ===================== RESPONSIVE ===================== */
@media (min-width:620px){
  .serv-grid{grid-template-columns:1fr 1fr}
  .gal{grid-template-columns:repeat(3,1fr)}
  .why-grid{grid-template-columns:1fr 1fr}
  .footer-grid{grid-template-columns:2fr 1fr 1fr}
}
@media (min-width:900px){
  .nav-links{display:flex}
  .burger{display:none}
  .brand-txt{display:block}
  .serv-grid{grid-template-columns:repeat(3,1fr)}
  .proc-grid{grid-template-columns:1fr 1fr;column-gap:42px}
  .why-grid{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:2.2fr 1fr 1fr 1fr}
}