/* ===== RAK Engenharia — design system (monocromático P&B, Titillium Web) ===== */
:root{
  --ink:#0C0D10; --ink-2:#1D1F26; --paper:#ffffff; --panel:#F5F4F4; --panel-2:#ECECEC;
  --line:#E0E0E0; --line-2:#C9C9C9; --muted:#5A5C63; --muted-2:#818181;
  --dark:#0C0D10; --dark-2:#15171C;
  --wrap:1200px; --pad:24px; --ease:cubic-bezier(.16,.84,.28,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth; scroll-padding-top:92px; -webkit-text-size-adjust:100%}
body{margin:0; background:var(--paper); color:var(--ink);
  font-family:"Titillium Web",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  font-size:17px; line-height:1.62; font-weight:400; overflow-x:hidden; -webkit-font-smoothing:antialiased}
img{max-width:100%; display:block}
a{color:inherit; text-decoration:none}
h1,h2,h3,h4{margin:0; font-family:"Titillium Web",sans-serif; font-weight:700; line-height:1.08; letter-spacing:-.01em}
p{margin:0}
.container{width:100%; max-width:var(--wrap); margin:0 auto; padding:0 var(--pad)}
.overline{display:inline-block; font-weight:700; text-transform:uppercase; letter-spacing:.18em;
  font-size:12.5px; color:var(--ink); margin-bottom:16px; position:relative; padding-left:34px}
.overline::before{content:""; position:absolute; left:0; top:50%; width:24px; height:2px; background:var(--ink)}
.on-dark .overline, .overline.inv{color:#fff} .on-dark .overline::before{background:#fff}

/* buttons */
.btn{display:inline-flex; align-items:center; gap:11px; font-weight:700; text-transform:uppercase;
  letter-spacing:.04em; font-size:14.5px; padding:16px 30px; border:2px solid var(--ink); cursor:pointer;
  background:var(--ink); color:#fff; transition:background .2s var(--ease),color .2s,transform .2s var(--ease),border-color .2s}
.btn svg{width:17px;height:17px;transition:transform .2s var(--ease)} .btn:hover svg{transform:translateX(4px)}
.btn:hover{background:#fff; color:var(--ink)}
.btn.ghost{background:transparent; color:var(--ink)} .btn.ghost:hover{background:var(--ink); color:#fff}
.btn.on-dark{border-color:#fff; background:#fff; color:var(--ink)} .btn.on-dark:hover{background:transparent; color:#fff}
.cta-wrap{margin-top:28px}
.microcopy{display:block; color:var(--muted); font-size:14px; margin-bottom:12px}
.on-dark .microcopy{color:#b9bcc4}

/* section shell */
.section{padding:96px 0; position:relative}
.section.alt{background:var(--panel)}
.section.dark{background:var(--dark); color:#fff}
.section.dark p{color:#c3c6cd}
.sec-head{max-width:860px; margin-bottom:52px}
.sec-head h2{font-size:clamp(28px,4vw,44px)}
.sec-head .lede{margin-top:18px; color:var(--muted); font-size:19px}
.section.dark .sec-head .lede{color:#c3c6cd}
.center{text-align:center} .center.sec-head{margin-left:auto;margin-right:auto}

/* header */
.site-header{position:fixed; inset:0 0 auto 0; z-index:60; background:rgba(255,255,255,.92); backdrop-filter:blur(9px); border-bottom:1px solid var(--line)}
.site-header .container{display:flex; align-items:center; gap:20px; height:72px}
.brand img{height:44px; width:auto}
.nav{margin-left:auto; display:flex; align-items:center; gap:30px}
.nav a.navlink{font-weight:600; font-size:15px; color:var(--ink-2)} .nav a.navlink:hover{opacity:.6}
.nav .btn{padding:11px 22px; font-size:13px}
.burger{display:none; background:none; border:0; color:var(--ink); cursor:pointer} .burger svg{width:28px;height:28px}

/* hero */
.hero{position:relative; min-height:92vh; display:flex; align-items:flex-end; padding:150px 0 72px; overflow:hidden; background:var(--dark)}
.hero-bg{position:absolute; inset:0; z-index:0}
.hero-bg img{width:100%; height:100%; object-fit:cover; opacity:.66}
.hero-bg::after{content:""; position:absolute; inset:0; background:linear-gradient(100deg, rgba(8,9,12,.9) 0%, rgba(8,9,12,.55) 52%, rgba(8,9,12,.12) 100%)}
.hero .container{position:relative; z-index:1}
.hero-inner{max-width:820px; color:#fff}
.hero h1{font-size:clamp(34px,5.6vw,64px); letter-spacing:-.02em; color:#fff}
.hero .sub{max-width:640px; margin-top:22px; font-size:clamp(17px,2vw,21px); color:#d4d7dd; font-weight:400; line-height:1.5}

/* client logos strip */
.logos-strip{padding:40px 0; border-bottom:1px solid var(--line); background:#fff}
.logos-strip .lbl{text-align:center; color:var(--muted); font-size:12.5px; text-transform:uppercase; letter-spacing:.14em; margin-bottom:22px; font-weight:700}
.logos-row{display:flex; flex-wrap:wrap; justify-content:center; align-items:center; gap:22px 46px}
.logos-row img{height:52px; width:auto; object-fit:contain; filter:grayscale(1); opacity:.62; transition:opacity .2s,filter .2s}
.logos-row img:hover{filter:none; opacity:1}
.logos-row span{font-family:"Titillium Web"; font-weight:700; font-size:19px; color:#5A5C63; text-transform:uppercase; letter-spacing:.02em}

/* card grids */
.grid-3{display:grid; grid-template-columns:repeat(3,1fr); gap:20px}
.grid-4{display:grid; grid-template-columns:repeat(4,1fr); gap:18px}
.card{background:#fff; border:1px solid var(--line); padding:32px 28px; position:relative; transition:border-color .25s,transform .25s var(--ease),box-shadow .25s}
.section.alt .card{background:#fff}
.card::before{content:""; position:absolute; left:0; top:0; width:0; height:3px; background:var(--ink); transition:width .3s var(--ease)}
.card:hover{transform:translateY(-4px); border-color:var(--line-2); box-shadow:0 18px 40px rgba(12,13,16,.07)} .card:hover::before{width:100%}
.card .n{font-weight:700; font-size:14px; color:var(--muted); letter-spacing:.1em}
.card h3{font-size:19px; margin:14px 0 10px; line-height:1.25}
.card p{color:var(--muted); font-size:15.5px; line-height:1.55}
.card .ico{width:40px;height:40px;stroke:var(--ink);stroke-width:1.6;fill:none;margin-bottom:8px}

/* full-width image band (parallax) */
.band{position:relative; min-height:52vh; display:flex; align-items:center; overflow:hidden; background:var(--dark)}
.band-bg{position:absolute; inset:0; z-index:0}
.band-bg img{width:100%; height:100%; object-fit:cover; opacity:.6}
.band-bg::after{content:""; position:absolute; inset:0; background:linear-gradient(90deg,rgba(8,9,12,.78),rgba(8,9,12,.32))}
.band .container{position:relative; z-index:1; color:#fff}
.band h2{font-size:clamp(26px,3.8vw,42px); max-width:760px; color:#fff}
.band p{margin-top:16px; max-width:600px; color:#d4d7dd; font-size:19px}

/* split image + text */
.split{display:grid; grid-template-columns:1.05fr .95fr; gap:56px; align-items:center}
.split.rev{grid-template-columns:.95fr 1.05fr}
.split.rev .split-media{order:2}
.split-media img{width:100%; aspect-ratio:3/4; max-height:560px; object-fit:cover; border:1px solid var(--line)}
.split h2{font-size:clamp(26px,3.6vw,40px); margin-bottom:18px}
.split p{color:var(--muted); font-size:18px} .split p+p{margin-top:14px}
.section.dark .split p{color:#c3c6cd}
.checklist{list-style:none; margin:22px 0 0; padding:0; display:grid; gap:12px}
.checklist li{display:flex; gap:12px; align-items:flex-start; font-size:16px; color:var(--ink)}
.section.dark .checklist li{color:#eef0f3}
.checklist svg{flex:0 0 auto; width:22px;height:22px; stroke:var(--ink); stroke-width:2.2; fill:none; margin-top:1px}
.section.dark .checklist svg{stroke:#fff}

/* comparativo (2 col) */
.compare{display:grid; grid-template-columns:1fr 1fr; gap:0; border:1px solid var(--line)}
.compare .col{padding:34px 30px}
.compare .col.bad{background:var(--panel)}
.compare .col.good{background:var(--ink); color:#fff}
.compare h3{font-size:15px; text-transform:uppercase; letter-spacing:.08em; margin-bottom:20px}
.compare .col.bad h3{color:var(--muted-2)} .compare .col.good h3{color:#fff}
.compare ul{list-style:none; margin:0; padding:0}
.compare li{display:flex; gap:12px; padding:13px 0; border-bottom:1px solid var(--line); font-size:15.5px; align-items:flex-start}
.compare .col.good li{border-bottom:1px solid rgba(255,255,255,.14); color:#e9eaed}
.compare .col.bad li{color:var(--muted)}
.compare li:last-child{border-bottom:0}
.compare li svg{flex:0 0 auto;width:19px;height:19px;margin-top:1px;stroke-width:2.2;fill:none}
.compare .col.bad li svg{stroke:var(--muted-2)} .compare .col.good li svg{stroke:#fff}

/* portfolio grid + lightbox */
.port-grid{display:grid; grid-template-columns:repeat(auto-fit,minmax(230px,1fr)); gap:16px}
.port-grid.feat .port:first-child{grid-column:span 2; grid-row:span 2}
@media(min-width:900px){.port-grid.feat{grid-template-columns:repeat(4,1fr); grid-auto-rows:1fr}}
.port{position:relative; overflow:hidden; cursor:pointer; aspect-ratio:3/4; border:1px solid rgba(255,255,255,.1); background:#000}
.port-grid.feat .port:first-child{aspect-ratio:auto}
.port img{width:100%;height:100%;object-fit:cover; transition:transform .5s var(--ease),opacity .3s}
.port:hover img{transform:scale(1.06); opacity:.85}
.port .cap{position:absolute; left:0; bottom:0; right:0; padding:18px 16px; background:linear-gradient(0deg,rgba(8,9,12,.88),transparent); color:#fff; font-size:13px; text-transform:uppercase; letter-spacing:.08em; font-weight:600}
.port .zoom{position:absolute; top:14px; right:14px; width:38px; height:38px; border:1.5px solid rgba(255,255,255,.7); border-radius:50%; display:flex; align-items:center; justify-content:center; opacity:0; transition:opacity .25s; color:#fff}
.port:hover .zoom{opacity:1}
.port .zoom svg{width:16px;height:16px;stroke:currentColor;stroke-width:2;fill:none}
.port-note{text-align:center; color:var(--muted); font-size:13.5px; margin-top:22px}
#lightbox{position:fixed; inset:0; z-index:90; background:rgba(8,9,12,.94); display:none; align-items:center; justify-content:center}
#lightbox.open{display:flex}
#lightbox img{max-width:90vw; max-height:82vh; object-fit:contain}
#lightbox .x,#lightbox .nav{position:absolute; background:none; border:0; color:#fff; cursor:pointer; font-size:34px; padding:16px}
#lightbox .x{top:8px; right:14px} #lightbox .prev{left:6px; top:50%; transform:translateY(-50%)} #lightbox .next{right:6px; top:50%; transform:translateY(-50%)}
#lightbox .count{position:absolute; bottom:18px; left:0; right:0; text-align:center; color:#cfd2d8; font-size:14px}

/* stats */
.stats{display:grid; grid-template-columns:repeat(3,1fr); gap:18px; border-top:1px solid rgba(255,255,255,.16); border-bottom:1px solid rgba(255,255,255,.16)}
.stat{padding:30px 18px; text-align:center; border-right:1px solid rgba(255,255,255,.16)}
.stat:last-child{border-right:0}
.stat .v{font-weight:700; font-size:clamp(32px,4.4vw,50px); color:#fff; line-height:1}
.stat .l{margin-top:8px; color:#c3c6cd; font-size:14.5px}

/* faq */
.faq{max-width:900px}
.faq-item{border-bottom:1px solid var(--line)}
.faq-q{width:100%; text-align:left; background:none; border:0; color:var(--ink); cursor:pointer; padding:24px 46px 24px 0;
  font-family:"Titillium Web"; font-weight:700; font-size:18px; position:relative}
.faq-q::after{content:"+"; position:absolute; right:6px; top:50%; transform:translateY(-50%); color:var(--ink); font-size:26px; font-weight:400; transition:transform .25s}
.faq-item.open .faq-q::after{content:"−"}
.faq-a{max-height:0; overflow:hidden; transition:max-height .35s var(--ease)}
.faq-a p{color:var(--muted); font-size:16px; padding:0 0 24px}

/* processo / passo a passo (CTA final) */
.cta-final{background:var(--dark); color:#fff; text-align:center; overflow:hidden; position:relative}
.cta-final .cta-bg{position:absolute; inset:0; z-index:0}
.cta-final .cta-bg img{width:100%;height:100%;object-fit:cover;opacity:.3}
.cta-final .cta-bg::after{content:"";position:absolute;inset:0;background:rgba(8,9,12,.78)}
.cta-final .container{position:relative; z-index:1}
.cta-final h2{font-size:clamp(28px,4.4vw,50px); max-width:900px; margin:0 auto; color:#fff}
.cta-final p{color:#c3c6cd; font-size:19px; margin:18px auto 0; max-width:600px}

/* footer */
.footer{background:var(--dark-2); color:#c3c6cd; padding:64px 0 30px}
.footer .cols{display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:32px}
.footer img{height:46px; margin-bottom:18px}
.footer h5{color:#fff; font-size:14px; text-transform:uppercase; letter-spacing:.06em; margin:0 0 16px}
.footer ul{list-style:none;margin:0;padding:0} .footer li{padding:6px 0; font-size:15px}
.footer a:hover{color:#fff}
.footer .bottom{border-top:1px solid rgba(255,255,255,.12); margin-top:44px; padding-top:22px; font-size:13.5px; color:#8a8d94; display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px}

/* reveal */
.js [data-rev]{opacity:0; transform:translateY(22px)}
[data-rev]{transition:opacity .7s var(--ease),transform .7s var(--ease)}
[data-rev].in{opacity:1; transform:none}
[data-rev].d1{transition-delay:.08s}[data-rev].d2{transition-delay:.16s}[data-rev].d3{transition-delay:.24s}

/* mobile menu */
.mobile{position:fixed; inset:0; z-index:80; background:var(--dark); color:#fff; transform:translateX(100%); transition:transform .35s var(--ease); padding:26px; display:flex; flex-direction:column}
.mobile.open{transform:translateX(0)}
.mobile .top{display:flex; justify-content:space-between; align-items:center; margin-bottom:26px}
.mobile .top img{height:40px}
.mobile a{font-weight:700; font-size:20px; padding:15px 0; border-bottom:1px solid rgba(255,255,255,.12); color:#fff}
.mobile .burger{color:#fff}

@media(max-width:960px){
  .split,.split.rev{grid-template-columns:1fr; gap:28px} .split.rev .split-media{order:0}
  .grid-4{grid-template-columns:repeat(2,1fr)}
  .footer .cols{grid-template-columns:1fr 1fr}
}
@media(max-width:820px){
  .nav{display:none} .burger{display:inline-flex; margin-left:auto}
  .section{padding:68px 0} .grid-3{grid-template-columns:1fr}
  .port-grid{grid-template-columns:repeat(2,1fr)}
  .compare{grid-template-columns:1fr}
}
@media(max-width:560px){
  body{font-size:16px}
  .grid-4{grid-template-columns:1fr} .stats{grid-template-columns:1fr}
  .stat{border-right:0;border-bottom:1px solid rgba(255,255,255,.16)} .stat:last-child{border-bottom:0}
  .port-grid{grid-template-columns:1fr}
  .btn{width:100%; justify-content:center} .nav .btn{width:auto}
  .footer .cols{grid-template-columns:1fr}
  .hero{min-height:auto}
}
@media(prefers-reduced-motion:reduce){
  html{scroll-behavior:auto} *{transition:none!important; animation:none!important}
  .js [data-rev]{opacity:1; transform:none}
}

/* ===== galeria premium (portfólio sem rótulos) ===== */
.gallery{display:grid; gap:14px; grid-template-columns:repeat(3,1fr)}
.gallery.cols4{grid-template-columns:repeat(4,1fr)}
.gallery .port{position:relative; overflow:hidden; cursor:pointer; aspect-ratio:3/4; background:#0a0b0e; border:1px solid rgba(255,255,255,.08)}
.gallery .port img{width:100%; height:100%; object-fit:cover; transition:transform .6s var(--ease)}
.gallery .port:hover img{transform:scale(1.06)}
.gallery .port::after{content:""; position:absolute; inset:0; background:rgba(8,9,12,0); transition:background .3s}
.gallery .port:hover::after{background:rgba(8,9,12,.32)}
.gallery .port .zoom{position:absolute; inset:0; margin:auto; width:56px; height:56px; border:1.5px solid rgba(255,255,255,.9); border-radius:50%; display:flex; align-items:center; justify-content:center; color:#fff; opacity:0; transform:scale(.86); transition:opacity .3s var(--ease),transform .3s var(--ease); z-index:1}
.gallery .port:hover .zoom{opacity:1; transform:scale(1)}
.gallery .port .zoom svg{width:20px; height:20px; stroke:currentColor; stroke-width:2; fill:none}
@media(max-width:820px){.gallery,.gallery.cols4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:520px){.gallery,.gallery.cols4{grid-template-columns:repeat(2,1fr); gap:10px}}