/* volterris.com — marketing site.
   Ground: survey paper. Accent: a working green, used on objects not scenes. */
:root{
  --bg:#F4F5F1; --surface:#FFFFFF; --surface-2:#E9EBE3;
  --ink:#151810; --ink-2:#454B3F; --muted:#6C7364;
  --rule:#D5D9CC; --rule-soft:#E3E6DB;
  --accent:#3E6B4A; --accent-2:#2C4F36; --accent-bg:#E2ECE4;
  --white:#FFFFFF;
  --f-d:"Archivo","Helvetica Neue",Arial,sans-serif;
  --f-b:"Source Serif 4",Georgia,"Times New Roman",serif;
  --f-m:"IBM Plex Mono",ui-monospace,Menlo,monospace;
  --shadow:0 1px 2px rgba(21,24,16,.05),0 8px 28px rgba(21,24,16,.07);
}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]){
  --bg:#101208; --bg:#111309; --surface:#181B12; --surface-2:#21251A;
  --ink:#E9EBE0; --ink-2:#C1C6B6; --muted:#8C9382;
  --rule:#2C3125; --rule-soft:#23271D;
  --accent:#83B491; --accent-2:#A0C9AC; --accent-bg:#1C2820;
  --shadow:0 1px 2px rgba(0,0,0,.5),0 8px 28px rgba(0,0,0,.4);
}}
:root[data-theme="dark"]{
  --bg:#111309; --surface:#181B12; --surface-2:#21251A;
  --ink:#E9EBE0; --ink-2:#C1C6B6; --muted:#8C9382;
  --rule:#2C3125; --rule-soft:#23271D;
  --accent:#83B491; --accent-2:#A0C9AC; --accent-bg:#1C2820;
  --shadow:0 1px 2px rgba(0,0,0,.5),0 8px 28px rgba(0,0,0,.4);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}
  *{animation:none!important;transition:none!important}}
body{margin:0;background:var(--bg);color:var(--ink);font-family:var(--f-b);
     font-size:17px;line-height:1.62;-webkit-font-smoothing:antialiased}
h1,h2,h3{font-family:var(--f-d);margin:0;text-wrap:balance;letter-spacing:-.021em}
p{margin:0 0 1rem}
a{color:var(--accent);text-underline-offset:2px}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:3px}
img,video{max-width:100%;display:block}

.skip{position:absolute;left:-9999px;top:0;background:var(--accent);color:#fff;
      padding:.6rem 1rem;z-index:999}
.skip:focus{left:.5rem;top:.5rem}

.eyebrow{font-family:var(--f-m);font-size:.72rem;font-weight:500;letter-spacing:.16em;
         text-transform:uppercase;color:var(--accent);margin:0 0 .85rem}
.measure{max-width:44rem;margin:0 auto}
.spacer{flex:1}

/* ── Nav ── */
.nav{position:fixed;inset:0 0 auto 0;z-index:500;display:flex;align-items:center;gap:1.2rem;
     padding:.95rem clamp(1rem,4vw,3rem);
     background:transparent;transition:background .25s ease,border-color .25s ease}
.nav.stuck{background:color-mix(in srgb,var(--bg) 92%,transparent);
           backdrop-filter:blur(10px);border-bottom:1px solid var(--rule)}
.brand{font-family:var(--f-d);font-weight:800;font-size:1.18rem;letter-spacing:.13em;
       text-transform:uppercase;color:var(--white);text-decoration:none;transition:color .25s}
.brand span{color:#9ED6AE}
.nav.stuck .brand{color:var(--ink)}
.nav.stuck .brand span{color:var(--accent)}
.navlinks{display:flex;gap:.3rem;margin-left:auto}
.navlinks a{font-family:var(--f-d);font-size:.82rem;font-weight:600;letter-spacing:.03em;
  padding:.4rem .75rem;border-radius:3px;color:rgba(255,255,255,.88);text-decoration:none;
  transition:color .25s,background .2s}
.navlinks a:hover{background:rgba(255,255,255,.14)}
.nav.stuck .navlinks a{color:var(--ink-2)}
.nav.stuck .navlinks a:hover{background:var(--surface-2)}
@media(max-width:44rem){.navlinks{display:none}.navlinks{margin-left:0}
  .nav{gap:.6rem}.brand{margin-right:auto}}

/* ── Buttons ── */
.btn{font-family:var(--f-d);font-size:.82rem;font-weight:600;letter-spacing:.04em;
     padding:.55rem 1.05rem;border-radius:3px;text-decoration:none;display:inline-flex;
     align-items:center;justify-content:center;border:1px solid transparent;
     transition:background .2s,border-color .2s,color .2s;white-space:nowrap}
.btn.lg{font-size:.88rem;padding:.75rem 1.5rem}
.btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}
.btn.primary:hover{background:var(--accent-2);border-color:var(--accent-2)}
.btn.ghost{background:rgba(255,255,255,.10);color:#fff;border-color:rgba(255,255,255,.55);
           backdrop-filter:blur(4px)}
.btn.ghost:hover{background:rgba(255,255,255,.2)}

/* ── Hero ── */
.hero{position:relative;min-height:100svh;display:flex;align-items:center;
      overflow:hidden;background:#1d2418}
.hero-video{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}
.hero-scrim{position:absolute;inset:0;z-index:1;
  background:linear-gradient(105deg,rgba(10,14,8,.86) 0%,rgba(10,14,8,.64) 42%,rgba(10,14,8,.22) 72%,rgba(10,14,8,.34) 100%)}
.hero-inner{position:relative;z-index:2;padding:7rem clamp(1.2rem,5vw,4.5rem) 6rem;
            max-width:56rem;color:#fff}
.hero .eyebrow{color:#9ED6AE}
.hero h1{font-size:clamp(2.2rem,6.2vw,4.4rem);font-weight:700;line-height:1.04;
         color:#fff;margin-bottom:1.3rem;text-shadow:0 2px 24px rgba(0,0,0,.35)}
.hero .lede{font-size:clamp(1.05rem,2.1vw,1.32rem);color:rgba(255,255,255,.93);
            max-width:34rem;margin-bottom:2rem;text-shadow:0 1px 12px rgba(0,0,0,.3)}
.hero-cta{display:flex;gap:.7rem;flex-wrap:wrap}
.scrollcue{position:absolute;bottom:1.7rem;left:50%;transform:translateX(-50%);z-index:2;
  width:1.4rem;height:2.2rem;border:1.5px solid rgba(255,255,255,.5);border-radius:99px;
  display:flex;justify-content:center;padding-top:.4rem}
.scrollcue span{width:3px;height:.5rem;border-radius:2px;background:rgba(255,255,255,.8);
  animation:cue 1.9s ease-in-out infinite}
@keyframes cue{0%,100%{opacity:0;transform:translateY(0)}40%{opacity:1}
  80%{opacity:0;transform:translateY(.7rem)}}
@media(max-width:44rem){.scrollcue{display:none}}

/* ── Bands ── */
.band{padding:clamp(3.5rem,9vw,6.5rem) clamp(1.2rem,5vw,3rem)}
.band.alt{background:var(--surface)}
.band h2{font-size:clamp(1.5rem,3.4vw,2.15rem);font-weight:600;line-height:1.18;
         margin-bottom:1.2rem}
.band p{color:var(--ink-2)}

/* ── Criteria ── */
/* Discrete tiles rather than a 1px-gap grid: with seven cards the trailing
   empty cell of a four-column grid would otherwise paint as a filled block. */
.crit{display:grid;grid-template-columns:repeat(auto-fit,minmax(17rem,1fr));
      gap:.85rem;max-width:70rem;margin:2.6rem auto 0}
.crit-card{background:var(--bg);border:1px solid var(--rule);border-radius:4px;
           padding:1.4rem 1.5rem 1.5rem;position:relative;overflow:hidden}
.crit-card .w{font-family:var(--f-d);font-size:.78rem;font-weight:700;
  letter-spacing:.02em;color:var(--muted);display:block;margin-bottom:.5rem;
  font-variant-numeric:tabular-nums}
.crit-card.weight-30 .w{color:var(--accent)}
.crit-card.weight-30::before{content:"";position:absolute;inset:0 auto 0 0;width:3px;
  background:var(--accent)}
.crit-card h3{font-size:1.06rem;font-weight:600;margin-bottom:.5rem}
.crit-card p{font-size:.92rem;color:var(--ink-2);margin:0}

/* ── Split ── */
.split{display:grid;grid-template-columns:1fr 1fr;align-items:center;gap:0;
       background:var(--surface);border-top:1px solid var(--rule)}
.split.reverse .split-img{order:2}
.split-img{aspect-ratio:16/10;overflow:hidden;background:var(--surface-2)}
.split-img img{width:100%;height:100%;object-fit:cover}
.split-copy{padding:clamp(2.2rem,5vw,4rem) clamp(1.4rem,4vw,3.4rem)}
.split-copy h2{font-size:clamp(1.4rem,2.8vw,1.95rem);font-weight:600;margin-bottom:1rem;
  line-height:1.2}
.split-copy p{color:var(--ink-2);font-size:.98rem}
@media(max-width:52rem){.split{grid-template-columns:1fr}
  .split.reverse .split-img{order:0}
  .split-img{aspect-ratio:16/9}}

/* ── CTA ── */
.cta{padding:clamp(3.5rem,9vw,6rem) clamp(1.2rem,5vw,3rem);text-align:center;
     background:var(--accent-bg);border-top:1px solid var(--rule)}
.cta h2{font-size:clamp(1.5rem,3.4vw,2.1rem);font-weight:600;margin-bottom:.8rem}
.cta p{color:var(--ink-2)}
.cta .contact{font-family:var(--f-d);font-size:1.15rem;font-weight:600;margin-top:1.3rem}

/* ── Footer ── */
.foot{display:flex;flex-wrap:wrap;gap:.5rem 1.5rem;align-items:center;
      padding:1.5rem clamp(1.2rem,5vw,3rem);border-top:1px solid var(--rule);
      font-family:var(--f-d);font-size:.8rem;color:var(--muted);background:var(--bg)}
.foot a{color:var(--accent);text-decoration:none}
.foot a:hover{text-decoration:underline}
.foot .dim{color:var(--muted);opacity:.75}