/* VaporPhase – minimal, responsive, monochrome-first site
   Built as static HTML. */

:root{
  --bg: #fbfbfb;
  --surface: #ffffff;
  --ink: #0b0b0d;
  --muted: #4a4a55;
  --muted-2: #6a6a78;
  --border: rgba(15, 15, 25, 0.12);
  --border-2: rgba(15, 15, 25, 0.08);
  --shadow: 0 10px 30px rgba(0,0,0,0.06);
  --radius: 18px;

  --max: 1120px;
  --pad: clamp(18px, 3vw, 28px);

  --sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --serif: ui-serif, Georgia, "Times New Roman", Times, serif;

  --h1: clamp(2.05rem, 4.6vw, 3.3rem);
  --h2: clamp(1.45rem, 2.6vw, 2.05rem);
  --h3: 1.1rem;
  --p: 1.02rem;

  --leading: 1.55;
  --tight: 1.15;

  /* one restrained accent for links/buttons */
  --accent: #0a3a2a; /* deep evergreen */
  --accent-2: #0d5a40;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin: 0;
  font-family: var(--sans);
  font-size: var(--p);
  line-height: var(--leading);
  color: var(--ink);
  background: radial-gradient(1200px 500px at 15% -10%, rgba(10,58,42,0.06), transparent 55%),
              radial-gradient(900px 500px at 95% 0%, rgba(0,0,0,0.04), transparent 60%),
              var(--bg);
}

img{ max-width: 100%; height: auto; display: block; }
a{ color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover{ color: var(--accent-2); }

.container{
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.skip-link{
  position: absolute;
  top: 10px;
  left: -999px;
  background: var(--ink);
  color: #fff;
  padding: 10px 12px;
  border-radius: 10px;
  z-index: 999;
}
.skip-link:focus{ left: 10px; }

header.site-header{
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(10px);
  background: color-mix(in srgb, var(--bg) 84%, transparent);
  border-bottom: 1px solid var(--border-2);
}

.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 14px 0;
}

.brand{
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--ink);
}
.brand:hover{ color: var(--ink); }

.brand img{
  width: 42px;
  height: auto;
}

.brand .brand-name{
  font-family: var(--serif);
  font-weight: 700;
  letter-spacing: 0.01em;
  font-size: 1.05rem;
  line-height: 1;
}
.brand .brand-tag{
  display: block;
  font-family: var(--sans);
  font-weight: 500;
  font-size: 0.86rem;
  color: var(--muted-2);
  margin-top: 2px;
}

.nav{
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav a{
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 10px 10px;
  border-radius: 12px;
}
.nav a:hover{
  background: rgba(0,0,0,0.04);
}
.nav a.active{
  background: rgba(10,58,42,0.08);
  color: var(--accent);
}

.nav-toggle{
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 10px 12px;
  cursor: pointer;
  color: var(--ink);
}
.nav-toggle:focus{ outline: 3px solid rgba(10,58,42,0.25); outline-offset: 2px; }
.nav-toggle svg{ width: 18px; height: 18px; display: block; }

@media (max-width: 820px){
  .nav-toggle{ display: inline-flex; align-items: center; gap: 10px; }
  .nav{
    position: absolute;
    right: var(--pad);
    top: 64px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 6px;
    min-width: 220px;
    padding: 10px;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    box-shadow: var(--shadow);
  }
  header.site-header[data-open="true"] .nav{ display: flex; }
  .nav a{ padding: 10px 12px; }
}

main{ padding: 28px 0 56px; }

.hero{
  padding: 28px 0 18px;
}
.hero-grid{
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  gap: clamp(18px, 3vw, 34px);
  align-items: center;
}



.hero-grid.solo{
  grid-template-columns: 1fr;
}

@media (max-width: 900px){
  .hero-grid{ grid-template-columns: 1fr; }
}

.eyebrow{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 7px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 70%, transparent);
  color: var(--muted);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 12px;
}

h1{
  font-size: var(--h1);
  line-height: var(--tight);
  margin: 0 0 12px;
  letter-spacing: -0.02em;
}
.lead{
  font-size: 1.1rem;
  color: var(--muted);
  margin: 0 0 18px;
  max-width: 62ch;
}

.actions{
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 18px;
}
.btn{
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 12px 14px;
  border-radius: 14px;
  border: 1px solid var(--border);
  text-decoration: none;
  font-weight: 700;
  font-size: 0.96rem;
  transition: transform 0.08s ease, background 0.2s ease;
  will-change: transform;
}
.btn:hover{ transform: translateY(-1px); }
.btn-primary{
  background: var(--ink);
  color: #fff;
  border-color: rgba(0,0,0,0.2);
}
.btn-primary:hover{ background: #000; color: #fff; }
.btn-secondary{
  background: rgba(255,255,255,0.65);
  color: var(--ink);
}
.btn-secondary:hover{ background: rgba(255,255,255,0.9); }

.hero-card{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: var(--shadow);
}
.hero-card .mini-title{
  margin: 0 0 10px;
  font-weight: 800;
  letter-spacing: -0.01em;
}
.hero-card p{
  margin: 0;
  color: var(--muted);
  font-size: 0.98rem;
}
.hero-logo{
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 12px 0 6px;
}
.hero-logo img{
  max-width: 260px;
  opacity: 0.95;
}

.section{
  padding: 38px 0;
}
.section-title{
  font-size: var(--h2);
  line-height: 1.22;
  margin: 0 0 10px;
  letter-spacing: -0.01em;
}
.section-sub{
  margin: 0 0 22px;
  color: var(--muted);
  max-width: 72ch;
}

.grid-3{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
@media (max-width: 980px){
  .grid-3{ grid-template-columns: 1fr; }
}

.card{
  background: rgba(255,255,255,0.75);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  box-shadow: 0 8px 20px rgba(0,0,0,0.04);
}
.card h3{
  font-size: 1.05rem;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.card p{
  margin: 0;
  color: var(--muted);
}
.card .icon{
  width: 28px;
  height: 28px;
  margin-bottom: 10px;
}

.band{
  background: color-mix(in srgb, var(--surface) 70%, transparent);
  border-top: 1px solid var(--border-2);
  border-bottom: 1px solid var(--border-2);
}

.split{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  align-items: start;
}
@media (max-width: 900px){
  .split{ grid-template-columns: 1fr; }
}

.kicker{
  font-weight: 800;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-size: 0.82rem;
  color: var(--muted-2);
  margin-bottom: 8px;
}

.list{
  margin: 10px 0 0;
  padding-left: 18px;
  color: var(--muted);
}
.list li{ margin: 8px 0; }

.diagram{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 14px;
  box-shadow: var(--shadow);
  overflow: hidden;
}
.diagram svg{
  width: 100%;
  height: auto;
  display: block;
}

.faq details{
  background: rgba(255,255,255,0.7);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 12px 14px;
  margin-bottom: 10px;
}
.faq summary{
  cursor: pointer;
  font-weight: 800;
}
.faq p{
  margin: 10px 0 0;
  color: var(--muted);
}

.footer{
  border-top: 1px solid var(--border-2);
  padding: 22px 0;
  color: var(--muted-2);
  font-size: 0.95rem;
}
.footer-grid{
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  flex-wrap: wrap;
}
.footer .tiny{
  font-size: 0.88rem;
  color: var(--muted-2);
}
.footer a{ color: var(--muted); }
.footer a:hover{ color: var(--accent); }

.badge{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 16px;
  border: 1px dashed rgba(15,15,25,0.25);
  background: rgba(255,255,255,0.55);
  color: var(--muted);
}

hr.soft{
  border: none;
  border-top: 1px solid var(--border-2);
  margin: 20px 0;
}