/* =========================================================
   TUS INTERNATIONAL — us-tus.com
   Three pages. Industrial gas. Simple.
   ========================================================= */

:root{
  --ink:#0A1E2C;
  --ink-2:#17394C;
  --steel:#556E7C;
  --mute:#8194A0;
  --line:#E1E7EA;
  --line-2:#EDF2F4;
  --paper:#ffffff;
  --wash:#F5F7F8;
  --wash-2:#EEF2F4;
  --amber:#FFB224;
  --amber-d:#DE9200;
  --brand:#0B63A8;

  --max:1180px;
  --gut:24px;
  --r:3px;
  --shadow:0 20px 40px -28px rgba(10,30,44,.35);
  --ease:cubic-bezier(.22,.61,.36,1);

  --sans:"Archivo","Helvetica Neue",Helvetica,Arial,"Segoe UI",sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--paper);color:var(--ink);font-family:var(--sans);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
h1,h2,h3,p{margin:0}
::selection{background:var(--amber);color:var(--ink)}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px}

.wrap{width:100%;max-width:var(--max);margin:0 auto;padding:0 var(--gut)}
.section{padding:80px 0}
.section--wash{background:var(--wash)}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;background:var(--ink);color:#fff;padding:10px 16px;z-index:99}

/* ---------- type ---------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--steel);
}
.eyebrow::before{content:"";width:20px;height:2px;background:var(--amber)}
h1{font-size:clamp(34px,4.6vw,58px);line-height:1.05;letter-spacing:-.03em;font-weight:700}
h2{font-size:clamp(24px,2.6vw,34px);line-height:1.12;letter-spacing:-.02em;font-weight:700}
.lead{font-size:17px;line-height:1.6;color:var(--ink-2)}
.small{font-size:13.5px;line-height:1.6;color:var(--steel)}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;height:46px;padding:0 20px;
  border:1px solid transparent;border-radius:var(--r);font-size:14px;font-weight:600;
  transition:background .16s var(--ease),border-color .16s var(--ease),color .16s var(--ease);
}
.btn svg{width:14px;height:14px;flex:none}
.btn--primary{background:var(--ink);color:#fff}
.btn--primary:hover{background:var(--brand)}
.btn--amber{background:var(--amber);color:#1A1400}
.btn--amber:hover{background:#FFC451}
.btn--ghost{border-color:var(--line);background:#fff}
.btn--ghost:hover{border-color:var(--ink)}
.link{display:inline-flex;align-items:center;gap:7px;font-size:13.5px;font-weight:600;border-bottom:1px solid var(--line);padding-bottom:2px;transition:.16s}
.link svg{width:12px;height:12px;transition:transform .2s var(--ease)}
.link:hover{border-color:var(--ink)}
.link:hover svg{transform:translateX(3px)}

/* ---------- topbar + header ---------- */
.topbar{background:var(--ink);color:#BFD0DA;font-size:12.5px}
.topbar__in{display:flex;justify-content:space-between;align-items:center;min-height:36px;gap:16px}
.topbar a:hover{color:#fff}
.topbar__l{display:flex;gap:20px;flex-wrap:wrap}
.topbar__r{font-family:var(--mono);font-size:10.5px;letter-spacing:.13em;text-transform:uppercase;color:#8FA9B8}

.header{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.header__in{display:flex;align-items:center;gap:32px;height:72px}
.brand{display:flex;align-items:center;gap:11px;flex:none}
.brand svg{width:34px;height:34px}
.brand__t{display:flex;flex-direction:column;line-height:1}
.brand__n{font-size:18px;font-weight:800;letter-spacing:.03em}
.brand__s{font-family:var(--mono);font-size:8px;letter-spacing:.3em;text-transform:uppercase;color:var(--mute);margin-top:4px}

.nav{display:flex;gap:4px;margin-left:auto}
.nav a{padding:9px 14px;font-size:14px;color:var(--ink-2);border-radius:var(--r);transition:.16s}
.nav a:hover{background:var(--wash)}
.nav a.on{font-weight:600;box-shadow:inset 0 -2px 0 var(--amber)}
.header__cta{display:flex;align-items:center;gap:14px}
.header__tel{font-family:var(--mono);font-size:12.5px;color:var(--ink-2)}
.header__tel:hover{color:var(--brand)}
.burger{display:none;width:42px;height:42px;border:1px solid var(--line);background:#fff;border-radius:var(--r);align-items:center;justify-content:center}
.burger i{display:block;width:16px;height:1.5px;background:var(--ink);position:relative}
.burger i::before,.burger i::after{content:"";position:absolute;left:0;width:16px;height:1.5px;background:var(--ink)}
.burger i::before{top:-5px}
.burger i::after{top:5px}
.mnav{display:none;border-bottom:1px solid var(--line);background:#fff}
.mnav.open{display:block}
.mnav a{display:block;padding:14px 0;border-bottom:1px solid var(--line-2);font-size:15px}

/* ---------- hero ---------- */
.hero{padding:64px 0 56px;border-bottom:1px solid var(--line)}
.hero__in{display:grid;grid-template-columns:1.02fr .98fr;gap:56px;align-items:center}
.hero h1{margin-top:16px}
.hero .lead{margin-top:18px;max-width:440px}
.hero__cta{display:flex;gap:10px;flex-wrap:wrap;margin-top:28px}
.hero__fig{position:relative;aspect-ratio:4/3;overflow:hidden;border-radius:var(--r);background:var(--wash-2)}
.hero__fig img{width:100%;height:100%;object-fit:cover}
.hero__fig figcaption{
  position:absolute;left:0;bottom:0;background:var(--ink);color:#fff;
  font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;padding:9px 14px;
}

/* ---------- product grid ---------- */
.phead{display:flex;justify-content:space-between;align-items:flex-end;gap:28px;flex-wrap:wrap;margin-bottom:34px}
.phead p{max-width:460px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.grid--5{grid-template-columns:repeat(5,1fr);gap:16px}
.card{
  display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);border-radius:var(--r);
  overflow:hidden;transition:border-color .2s var(--ease),transform .22s var(--ease),box-shadow .22s var(--ease);
}
.card:hover{border-color:var(--ink-2);transform:translateY(-3px);box-shadow:var(--shadow)}
.card__fig{position:relative;aspect-ratio:1/1;background:var(--wash-2);overflow:hidden}
.card__fig img{width:100%;height:100%;object-fit:cover;transition:transform .4s var(--ease)}
.card:hover .card__fig img{transform:scale(1.03)}
.card__tag{
  position:absolute;top:12px;left:12px;background:rgba(255,255,255,.94);border:1px solid var(--line);
  font-family:var(--mono);font-size:9.5px;letter-spacing:.13em;text-transform:uppercase;padding:4px 8px;color:var(--ink-2);
}
.card__b{padding:20px 20px 22px;display:flex;flex-direction:column;flex:1}
.card__b h3{font-size:18px;font-weight:700;letter-spacing:-.01em}
.card__spec{margin-top:10px;display:grid;gap:4px}
.card__spec span{font-size:13px;color:var(--steel);display:flex;gap:8px}
.card__spec span::before{content:"";width:12px;height:1px;background:var(--amber);flex:none;margin-top:9px}
.card__f{margin-top:auto;padding-top:18px}

/* ---------- notice strip ---------- */
.strip{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--wash)}
.strip__in{display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;padding:26px 0}
.strip b{font-size:16px}
.strip .small{max-width:520px}

/* ---------- about ---------- */
.about-intro{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.about-intro h1{max-width:520px}
.about-intro .lead{margin-top:18px}
.about-fig{aspect-ratio:3/2;overflow:hidden;border-radius:var(--r);background:var(--wash-2)}
.about-fig img{width:100%;height:100%;object-fit:cover}

.caps{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:var(--line);border:1px solid var(--line);margin-top:40px}
.cap{background:#fff;padding:28px}
.cap__n{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--mute)}
.cap h3{font-size:17px;margin-top:14px;font-weight:700}
.cap p{font-size:13.5px;color:var(--steel);margin-top:8px;line-height:1.62}

.facts{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.14);border:1px solid rgba(255,255,255,.14);margin-top:48px}
.fact{background:rgba(10,30,44,.4);padding:22px}
.fact span{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.13em;text-transform:uppercase;color:#8FA9B8}
.fact b{display:block;margin-top:10px;font-size:15px;color:#fff;font-weight:600;line-height:1.35}
.dark{background:var(--ink);color:#D7E3EA}
.dark h2{color:#fff}
.dark .lead{color:#A7BCC9}

/* ---------- contact ---------- */
.contact{display:grid;grid-template-columns:.92fr 1.08fr;gap:60px;align-items:start}
.rows{border-top:1px solid var(--ink);margin-top:26px}
.row{display:grid;grid-template-columns:96px 1fr;gap:16px;padding:16px 0;border-bottom:1px solid var(--line)}
.row dt{font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--mute);padding-top:3px}
.row dd{margin:0;font-size:14.5px;line-height:1.6}
.row dd a{border-bottom:1px solid var(--line)}
.row dd a:hover{border-color:var(--ink)}

.form{background:var(--wash);border:1px solid var(--line);padding:28px;border-radius:var(--r)}
.field{display:block;margin-top:14px}
.field:first-of-type{margin-top:0}
.field > span{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.12em;text-transform:uppercase;color:var(--mute);margin-bottom:6px}
.field input,.field textarea{
  width:100%;border:1px solid var(--line);background:#fff;border-radius:var(--r);padding:11px 12px;
  font-family:var(--sans);font-size:14px;color:var(--ink);transition:border-color .16s,box-shadow .16s;
}
.field textarea{min-height:110px;resize:vertical;line-height:1.55}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(11,99,168,.1)}
.field input::placeholder,.field textarea::placeholder{color:#A9B8C2}
.f2{display:grid;grid-template-columns:1fr 1fr;gap:0 14px}
.f2 .field{margin-top:0}
.form .btn{width:100%;margin-top:18px}
.note{font-size:11.5px;color:var(--mute);margin-top:12px;line-height:1.55}

/* ---------- footer ---------- */
.footer{background:var(--ink);color:#A9BFCC;font-size:13px;padding:52px 0 0}
.footer__in{display:grid;grid-template-columns:1.5fr 1fr 1fr;gap:40px;padding-bottom:40px}
.footer h4{font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:#7E97A7;font-weight:500;margin:0 0 14px}
.footer .brand__n{color:#fff}
.footer .brand__s{color:#7E97A7}
.footer p{margin-top:16px;line-height:1.7;max-width:300px;color:#93AAB9}
.footer__l{display:grid;gap:8px}
.footer a:hover{color:#fff}
.footer__b{border-top:1px solid rgba(255,255,255,.12);padding:18px 0;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:11.5px;color:#7E97A7}
.footer__b .mono{letter-spacing:.05em}

/* ---------- toast ---------- */
.toast{
  position:fixed;left:50%;bottom:26px;transform:translate(-50%,14px);z-index:120;
  background:var(--ink);color:#fff;padding:11px 18px;font-size:13px;border-radius:var(--r);
  opacity:0;visibility:hidden;transition:.22s var(--ease);
}
.toast.on{opacity:1;visibility:visible;transform:translate(-50%,0)}

/* ---------- responsive ---------- */
@media (max-width:1100px){
  .grid--5{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:1000px){
  .hero__in{grid-template-columns:1fr;gap:34px}
  .hero__fig{order:-1}
  .grid{grid-template-columns:1fr 1fr}
  .grid--5{grid-template-columns:repeat(3,1fr)}
  .about-intro{grid-template-columns:1fr;gap:34px}
  .contact{grid-template-columns:1fr;gap:40px}
  .footer__in{grid-template-columns:1fr 1fr}
  .facts{grid-template-columns:1fr 1fr}
  .nav{display:none}
  .burger{display:flex}
  .header__in{height:64px;gap:14px}
}
@media (max-width:720px){
  .section{padding:56px 0}
  .hero{padding:36px 0 44px}
  .grid{grid-template-columns:1fr}
  .grid--5{grid-template-columns:1fr 1fr}
  .caps{grid-template-columns:1fr}
  .facts{grid-template-columns:1fr}
  .f2{grid-template-columns:1fr}
  .footer__in{grid-template-columns:1fr}
  .header__tel{display:none}
  .topbar__r{display:none}
  .row{grid-template-columns:1fr;gap:4px}
  .phead{margin-bottom:24px}
  .form{padding:20px}
  .header__cta .btn{height:40px;padding:0 14px;font-size:13px}
}
@media (max-width:560px){
  .grid--5{grid-template-columns:1fr}
}