/* ============================================================
   UVClean USA / Deleflu — design tokens
   ============================================================ */
:root{
  --bg:            #FAFAFC;
  --surface:       #FFFFFF;
  --ink:           #14141F;
  --mute:          #6B6878;
  --line:          #E3E1EC;
  --indigo:        #241B5E;
  --violet:        #6C4FF6;
  --violet-soft:   #EFEAFE;
  --teal:          #0BA89A;
  --teal-soft:     #E4F7F5;

  --display: 'Space Grotesk', 'Segoe UI', sans-serif;
  --body:    'IBM Plex Sans', 'Segoe UI', sans-serif;
  --mono:    'IBM Plex Mono', ui-monospace, monospace;

  --max: 1120px;
  --gutter: clamp(20px, 5vw, 64px);
}

*{ box-sizing:border-box; margin:0; padding:0; }
html{ scroll-behavior:smooth; }

body{
  background:var(--bg);
  color:var(--ink);
  font-family:var(--body);
  font-size:16px;
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *{ animation-duration:0.001ms !important; transition-duration:0.001ms !important; }
}

a{ color:inherit; }
img{ max-width:100%; display:block; }

.wrap{
  max-width:var(--max);
  margin:0 auto;
  padding-left:var(--gutter);
  padding-right:var(--gutter);
}

/* ---------- eyebrow / mono labels ---------- */
.eyebrow{
  font-family:var(--mono);
  font-size:12px;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--violet);
  display:flex;
  align-items:center;
  gap:10px;
}
.eyebrow::before{
  content:"";
  width:18px;
  height:1px;
  background:var(--violet);
  display:inline-block;
}

/* ---------- headings ---------- */
h1,h2,h3{
  font-family:var(--display);
  font-weight:600;
  letter-spacing:-0.01em;
  color:var(--indigo);
}
h1{ font-size:clamp(34px, 5.4vw, 64px); line-height:1.05; }
h2{ font-size:clamp(24px, 3.2vw, 34px); line-height:1.15; margin-bottom:.6em; }
h3{ font-size:19px; margin-bottom:.4em; }
p{ color:var(--ink); }
.lede{
  font-size:clamp(17px, 2vw, 20px);
  color:var(--mute);
  max-width:56ch;
}

/* ---------- nav ---------- */
header.site{
  position:sticky; top:0; z-index:50;
  background:rgba(250,250,252,.86);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.nav{
  display:flex; align-items:center; justify-content:space-between;
  height:72px;
}
.brand{
  font-family:var(--display);
  font-weight:600;
  font-size:18px;
  color:var(--indigo);
  text-decoration:none;
  display:flex; align-items:center; gap:9px;
}
.brand .dot{
  width:9px; height:9px; border-radius:50%;
  background:var(--violet);
  box-shadow:0 0 0 4px var(--violet-soft);
}
.navlinks{
  display:flex; gap:clamp(14px,3vw,32px);
  font-family:var(--mono);
  font-size:13px;
  letter-spacing:.04em;
  text-transform:uppercase;
  list-style:none;
}
.navlinks a{
  text-decoration:none;
  color:var(--mute);
  padding:6px 0;
  border-bottom:1px solid transparent;
  transition:color .15s, border-color .15s;
}
.navlinks a:hover, .navlinks a[aria-current="page"]{
  color:var(--indigo);
  border-color:var(--violet);
}
.navlinks a:focus-visible, a:focus-visible, button:focus-visible{
  outline:2px solid var(--violet);
  outline-offset:3px;
}

/* ---------- hero ---------- */
.hero{
  padding:clamp(56px,9vw,110px) 0 clamp(40px,6vw,64px);
}
.hero .eyebrow{ margin-bottom:22px; }
.hero h1{ max-width:16ch; }
.hero .lede{ margin-top:22px; }
.hero .cta-row{
  margin-top:34px;
  display:flex; gap:14px; flex-wrap:wrap;
}

/* ---------- buttons ---------- */
.btn{
  font-family:var(--mono);
  font-size:13px;
  letter-spacing:.04em;
  text-transform:uppercase;
  text-decoration:none;
  padding:13px 22px;
  border-radius:2px;
  display:inline-flex;
  align-items:center;
  gap:8px;
  transition:transform .15s ease, background .15s ease, color .15s ease;
}
.btn-primary{
  background:var(--indigo);
  color:#fff;
  border:1px solid var(--indigo);
}
.btn-primary:hover{ background:var(--violet); border-color:var(--violet); transform:translateY(-1px); }
.btn-ghost{
  background:transparent;
  color:var(--indigo);
  border:1px solid var(--line);
}
.btn-ghost:hover{ border-color:var(--violet); color:var(--violet); transform:translateY(-1px); }

/* ============================================================
   Signature element — the wavelength ruler
   A horizontal scale of the UV spectrum (100–300nm) with the
   254nm germicidal line marked. Used as a structural divider
   between sections on every page.
   ============================================================ */
.ruler{
  padding:26px 0;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
  overflow:hidden;
}
.ruler svg{ width:100%; height:auto; display:block; }
.ruler-caption{
  font-family:var(--mono);
  font-size:11px;
  color:var(--mute);
  letter-spacing:.06em;
  text-transform:uppercase;
  margin-top:10px;
  display:flex;
  justify-content:space-between;
}

/* ---------- section ---------- */
section.block{
  padding:clamp(48px,7vw,84px) 0;
}
.grid-2{
  display:grid;
  grid-template-columns:.85fr 1.15fr;
  gap:clamp(28px,5vw,64px);
}
.grid-3{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:clamp(20px,3vw,32px);
}
@media (max-width:760px){
  .grid-2, .grid-3{ grid-template-columns:1fr; }
}

.card{
  background:var(--surface);
  border:1px solid var(--line);
  padding:26px;
}
.card .eyebrow{ margin-bottom:14px; }
.card p{ color:var(--mute); font-size:15px; }

.stat{
  font-family:var(--mono);
  font-size:13px;
  color:var(--mute);
}
.stat b{
  display:block;
  font-family:var(--display);
  font-size:28px;
  color:var(--indigo);
  font-weight:600;
}

/* ---------- regulatory disclosure box (used on every page) ---------- */
.disclosure{
  background:var(--teal-soft);
  border:1px solid #BFE9E4;
  padding:22px 26px;
  font-family:var(--mono);
  font-size:12.5px;
  line-height:1.7;
  color:#0B4F49;
}
.disclosure b{ color:var(--indigo); }

/* ---------- list / process ---------- */
.speclist{ list-style:none; }
.speclist li{
  display:flex;
  justify-content:space-between;
  gap:20px;
  padding:16px 0;
  border-bottom:1px solid var(--line);
  font-family:var(--mono);
  font-size:14px;
}
.speclist li span:first-child{ color:var(--mute); }
.speclist li span:last-child{ color:var(--indigo); text-align:right; }

/* ---------- footer ---------- */
footer.site{
  border-top:1px solid var(--line);
  padding:44px 0 34px;
  margin-top:40px;
}
.foot-grid{
  display:flex;
  justify-content:space-between;
  gap:24px;
  flex-wrap:wrap;
  margin-bottom:28px;
}
.foot-brand{
  font-family:var(--display);
  font-weight:600;
  color:var(--indigo);
}
.foot-meta{
  font-family:var(--mono);
  font-size:12px;
  color:var(--mute);
  max-width:40ch;
}
.copyright{
  font-family:var(--mono);
  font-size:11px;
  color:var(--mute);
  border-top:1px solid var(--line);
  padding-top:18px;
}

/* ---------- forms (contact page) ---------- */
.field{ margin-bottom:20px; }
.field label{
  display:block;
  font-family:var(--mono);
  font-size:12px;
  text-transform:uppercase;
  letter-spacing:.06em;
  color:var(--mute);
  margin-bottom:8px;
}
.field input, .field select, .field textarea{
  width:100%;
  border:1px solid var(--line);
  background:var(--surface);
  padding:13px 14px;
  font-family:var(--body);
  font-size:15px;
  color:var(--ink);
}
.field textarea{ resize:vertical; min-height:120px; }
.field input:focus, .field select:focus, .field textarea:focus{
  outline:none;
  border-color:var(--violet);
  box-shadow:0 0 0 3px var(--violet-soft);
}
.formnote{
  font-family:var(--mono);
  font-size:12px;
  color:var(--mute);
  margin-top:14px;
}