/* R&C Engineering Services — site styles
   Palette (interim, no client brand yet):
   --ink     #0F1720  page dark, text on light
   --graphite#1C2731  dark panels
   --lamp    #E3A23B  accent: buttons, rules on dark (lighting nod)
   --lamp-dk #8A5A0E  accent for small text on light (AA on paper/white)
   --steel   #5E6C79  secondary text on light
   --paper   #F2F3F1  light sections
*/
:root{
  --ink:#0F1720;--graphite:#1C2731;--lamp:#E3A23B;--lamp-dk:#8A5A0E;
  --steel:#5E6C79;--paper:#F2F3F1;--white:#fff;--rule:rgba(15,23,32,.14);--rule-dk:rgba(255,255,255,.16);
  --ease:cubic-bezier(.16,1,.3,1);
  --head:"Archivo",system-ui,sans-serif;--body:"Public Sans",system-ui,sans-serif;
  --wrap:1180px;
}
*,*::before,*::after{box-sizing:border-box}
html,body{overflow-x:clip;max-width:100%}
html{scroll-padding-top:88px}
body{margin:0;font-family:var(--body);font-size:17px;line-height:1.6;color:var(--ink);background:var(--white);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit}
a,button,summary{touch-action:manipulation}
h1,h2,h3{font-family:var(--head);font-weight:500;line-height:1.08;margin:0;letter-spacing:-.02em}
h1{font-size:clamp(2.6rem,6vw,4.9rem);letter-spacing:-.035em}
h2{font-size:clamp(1.9rem,3.6vw,2.9rem)}
h3{font-size:1.45rem;letter-spacing:-.01em}
h1 + *,h2 + *,h3 + *{margin-top:18px}
p{margin:0}
p + p{margin-top:14px}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 28px}

/* skip link + focus */
.skip{position:absolute;left:16px;top:-60px;z-index:100;background:var(--lamp);color:var(--ink);padding:10px 16px;font-weight:600;text-decoration:none;border-radius:4px}
.skip:focus{top:96px}
:focus-visible{outline:3px solid var(--lamp);outline-offset:3px}
.btn:focus-visible{outline:3px solid var(--white);box-shadow:0 0 0 6px var(--ink)}
.on-light .btn:focus-visible,.paper .btn:focus-visible{outline-color:var(--ink);box-shadow:none}

/* header */
.site-head{position:sticky;top:0;z-index:50;background:var(--ink);color:var(--white);border-bottom:1px solid var(--rule-dk)}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;height:76px;gap:24px}
.brand{display:flex;align-items:center;gap:12px;text-decoration:none}
.brand svg{width:46px;height:46px;flex:none}
.brand span{font-family:var(--head);font-size:.98rem;line-height:1.15;letter-spacing:.01em}
.brand span b{display:block;font-weight:600;font-size:1.12rem;letter-spacing:-.01em}
.nav{display:flex;align-items:center;gap:34px}
.nav a{text-decoration:none;font-size:.95rem;position:relative;padding:6px 0}
/* hover: rule thickens in place (variant 7) — resting hairline, no layout shift */
.nav a.link::after{content:"";position:absolute;left:0;right:0;bottom:-2px;height:1px;background:var(--rule-dk);transition:height .35s var(--ease),background-color .35s var(--ease)}
.nav a.link:hover::after,.nav a.link:focus-visible::after,.nav a.link[aria-current="page"]::after{height:3px;background:var(--lamp)}
.btn{display:inline-flex;align-items:center;gap:10px;background:var(--lamp);color:var(--ink);font-weight:600;font-size:.98rem;text-decoration:none;padding:13px 22px;border-radius:3px;border:0;cursor:pointer;transition:background-color .3s var(--ease),transform .3s var(--ease)}
.btn:hover{background:#F0B550;transform:translateY(-1px)}
.btn.ghost{background:transparent;color:inherit;box-shadow:inset 0 0 0 1px currentColor}
.btn.ghost:hover{background:rgba(255,255,255,.08)}
.nav a.btn{padding:11px 20px;font-size:.92rem;white-space:nowrap;line-height:1.2}
.drawer a.btn{padding:14px 22px;font-family:var(--body);border-bottom:0}
.menu-btn{display:none;background:none;border:1px solid var(--rule-dk);color:var(--white);font:600 .9rem var(--body);padding:10px 14px;border-radius:3px;cursor:pointer}

/* drawer (sibling of header) */
.drawer{position:fixed;inset:76px 0 0 0;z-index:49;background:var(--ink);color:var(--white);padding:30px 28px;display:flex;flex-direction:column;gap:6px;transform:translateY(-8px);opacity:0;visibility:hidden;transition:opacity .35s var(--ease),transform .35s var(--ease),visibility 0s .35s}
.drawer.open{opacity:1;transform:none;visibility:visible;transition:opacity .35s var(--ease),transform .35s var(--ease)}
.drawer a{font-family:var(--head);font-size:1.9rem;text-decoration:none;padding:12px 0;border-bottom:1px solid var(--rule-dk)}
.drawer .btn{margin-top:24px;align-self:flex-start;font-size:1rem}

@media(max-width:860px){
  .nav{display:none}
  .menu-btn{display:inline-block}
}

/* hero */
.hero{position:relative;min-height:min(88svh,820px);display:flex;align-items:flex-end;color:var(--white);background:var(--ink);overflow:hidden}
.hero-img{position:absolute;inset:0}
.hero-img img{width:100%;height:100%;object-fit:cover;animation:pan 24s var(--ease) both}
.hero::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,23,32,.25) 0%,rgba(15,23,32,.55) 45%,rgba(15,23,32,.92) 100%)}
.hero .wrap{position:relative;z-index:1;padding-bottom:84px;padding-top:140px;width:100%}
.hero h1{max-width:13ch}
.hero .lede{font-size:1.18rem;max-width:56ch;color:rgba(255,255,255,.86);margin-top:26px}
.hero .actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:36px}
@keyframes pan{from{transform:scale(1.08)}to{transform:scale(1)}}

.page-hero{position:relative;color:var(--white);background:var(--ink);overflow:hidden}
.page-hero .bg{position:absolute;inset:0}
.page-hero .bg img{width:100%;height:100%;object-fit:cover;opacity:.42;animation:pan 24s var(--ease) both}
.page-hero .wrap{position:relative;padding-top:120px;padding-bottom:72px}
.page-hero p{max-width:58ch;color:rgba(255,255,255,.86);font-size:1.12rem}

/* sections */
section{padding:104px 0}
.paper{background:var(--paper)}
.dark{background:var(--ink);color:var(--white)}
.intro{display:grid;grid-template-columns:1fr 1.25fr;gap:64px;align-items:start;border-top:1px solid var(--rule);padding-top:40px}
.intro p{font-size:1.2rem;color:var(--ink)}
.intro p.muted{color:var(--steel);font-size:1.05rem}
@media(max-width:860px){.intro{grid-template-columns:1fr;gap:24px}}

/* expanding panel strip (house pattern) */
.strip{display:flex;gap:10px;height:520px;margin-top:48px}
.panel{position:relative;flex:1 1 0;min-width:0;border-radius:12px;overflow:hidden;color:var(--white);text-decoration:none;transition:flex-grow .7s var(--ease)}
.strip .panel:hover,.strip .panel:focus-visible{flex-grow:2.1}
.panel img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;transition:transform .9s var(--ease)}
.panel:hover img{transform:scale(1.03)}
.panel::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(15,23,32,0) 30%,rgba(15,23,32,.9) 100%)}
.panel .txt{position:absolute;left:0;right:0;bottom:0;z-index:1;padding:28px}
.panel h3{font-size:1.5rem}
.panel p{font-size:.98rem;color:rgba(255,255,255,.85);margin-top:10px;max-width:34ch}
.panel .more{display:inline-block;margin-top:16px;font-weight:600;font-size:.92rem;border-bottom:2px solid var(--lamp);padding-bottom:2px}
@media(hover:none),(max-width:1040px){
  .strip{flex-direction:column;height:auto}
  .panel{min-height:300px;flex:none}
  .strip .panel:hover{flex-grow:0}
}

/* services detail rows */
.svc{display:grid;grid-template-columns:1.1fr 1fr;gap:64px;align-items:center}
.svc + .svc{margin-top:110px}
.svc.flip .media{order:2}
.svc .media{border-radius:12px;overflow:hidden;aspect-ratio:4/3}
.svc .media img{width:100%;height:100%;object-fit:cover;transition:transform .9s var(--ease)}
.svc .media:hover img{transform:scale(1.03)}
.svc p{color:var(--steel);font-size:1.08rem;max-width:46ch}
.svc ul{margin:22px 0 0;padding:0;list-style:none;border-top:1px solid var(--rule)}
.svc li{padding:12px 0;border-bottom:1px solid var(--rule)}
@media(max-width:860px){.svc{grid-template-columns:1fr;gap:28px}.svc.flip .media{order:0}}

/* about */
.about{display:grid;grid-template-columns:.9fr 1.1fr;gap:72px;align-items:start}
.about .media{border-radius:12px;overflow:hidden;aspect-ratio:4/5}
.about .media img{width:100%;height:100%;object-fit:cover}
.about p{font-size:1.15rem}
@media(max-width:860px){.about{grid-template-columns:1fr;gap:32px}.about .media{aspect-ratio:4/3}}

/* contact */
.contact-grid{display:flex;flex-wrap:wrap;justify-content:center;gap:18px}
.contact-grid > *{flex:0 1 calc((100% - 18px)/2);min-width:260px;margin:0}
.c-card{display:block;text-decoration:none;background:var(--white);border:1px solid var(--rule);border-radius:12px;padding:40px 36px;transition:border-color .35s var(--ease),transform .35s var(--ease)}
.c-card:hover{border-color:var(--lamp);transform:translateY(-2px)}
.c-card .label{font-size:.92rem;color:var(--steel)}
.c-card .val{display:block;font-family:var(--head);font-size:clamp(1.4rem,2.6vw,2rem);letter-spacing:-.02em;margin-top:8px;overflow-wrap:anywhere}
@media(max-width:620px){.contact-grid > *{flex-basis:100%}}

/* contact split */
.contact-split{display:grid;grid-template-columns:1.1fr .9fr;gap:72px;align-items:start}
.contact-split p{font-size:1.1rem;max-width:52ch}
.contact-split h2 + p{margin-top:22px}
.years{display:flex;align-items:baseline;gap:14px;font-family:var(--head);font-size:1.05rem;color:var(--steel);margin-bottom:30px;padding-bottom:26px;border-bottom:1px solid var(--rule)}
.years span{font-size:clamp(4rem,9vw,6.5rem);line-height:.9;letter-spacing:-.05em;color:var(--ink);font-weight:500}
.contact-stack{display:grid;gap:18px}
.contact-stack .c-card{margin:0}
.c-card .val.email{font-size:clamp(1.05rem,1.7vw,1.4rem);overflow-wrap:normal;word-break:normal}
@media(max-width:400px){.c-card .val.email{font-size:1rem}}
@media(max-width:860px){.contact-split{grid-template-columns:1fr;gap:40px}}

/* cta band */
.cta{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:28px}
.cta h2{max-width:18ch}
.cta .actions{display:flex;flex-wrap:wrap;gap:14px}

/* footer */
.site-foot{background:var(--ink);color:rgba(255,255,255,.78);padding:64px 0 40px;font-size:.95rem;border-top:1px solid var(--rule-dk)}
.foot-grid{display:flex;flex-wrap:wrap;justify-content:space-between;gap:36px}
.site-foot a{text-decoration:none}
.site-foot a:hover{color:var(--lamp)}
.site-foot ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.foot-base{margin-top:48px;padding-top:24px;border-top:1px solid var(--rule-dk);font-size:.85rem;color:rgba(255,255,255,.62)}

/* reveal */
.js .reveal{opacity:0;transform:translateY(16px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.js .reveal.on{opacity:1;transform:none}
.js .slide-l{opacity:0;transform:translateX(-70px);transition:opacity 1s var(--ease),transform 1s var(--ease)}
.js .slide-r{opacity:0;transform:translateX(70px);transition:opacity 1s var(--ease),transform 1s var(--ease)}
.js .slide-l.on,.js .slide-r.on{opacity:1;transform:none}
@media(max-width:620px){.js .slide-l{transform:translateX(-24px)}.js .slide-r{transform:translateX(24px)}}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .js .reveal,.js .slide-l,.js .slide-r{opacity:1;transform:none}
}