/* Gravity Driven Industries — gravitytogrid.com — site stylesheet v1.0.0
   Palette (house standard): black #0A0A0A, gold #C49A2A, silver #C8C8C8.
   Neutrals only otherwise. Type: Montserrat. */

:root{
  --black:#0A0A0A;
  --gold:#C49A2A;
  --silver:#C8C8C8;
  --white:#FFFFFF;
  --paper:#F2F2F2;
  --ink:#1C1C1C;
  --ink-soft:#4A4A4A;
  --max:1120px;
  --measure:68ch;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0;font-family:"Montserrat",system-ui,sans-serif;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}
:focus-visible{outline:3px solid var(--gold);outline-offset:3px}

h1,h2,h3{font-weight:700;line-height:1.15;margin:0 0 .6em;letter-spacing:-.01em;color:var(--black)}
h1{font-size:clamp(2rem,4.6vw,3.4rem)}
h2{font-size:clamp(1.55rem,3vw,2.25rem)}
h3{font-size:1.2rem;margin-bottom:.4em}
p{margin:0 0 1em;max-width:var(--measure)}
.lede{font-size:1.2rem;font-weight:500;color:var(--ink)}
.muted{color:var(--ink-soft)}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* Header */
.site-head{background:var(--black);color:var(--white);border-bottom:2px solid var(--gold)}
.site-head .wrap{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:72px}
.brand img{height:22px;width:auto}
.nav{display:flex;gap:28px;align-items:center;font-size:.92rem;font-weight:500}
.nav a{color:var(--white);text-decoration:none;padding:6px 0;border-bottom:2px solid transparent}
.nav a:hover,.nav a[aria-current="page"]{border-bottom-color:var(--gold)}
.btn{display:inline-block;background:var(--gold);color:var(--black);font-weight:700;text-decoration:none;
  padding:12px 20px;border:2px solid var(--gold);font-size:.95rem}
.btn:hover{background:var(--black);color:var(--gold)}
.btn.ghost{background:transparent;color:var(--gold)}
.btn.ghost:hover{background:var(--gold);color:var(--black)}
.btn.dark{background:var(--black);color:var(--gold);border-color:var(--black)}
.btn.dark:hover{background:var(--gold);color:var(--black)}
.menu-btn{display:none;background:none;border:2px solid var(--gold);color:var(--gold);font:inherit;font-weight:700;padding:8px 12px}
@media (max-width:860px){
  .nav{display:none;position:absolute;left:0;right:0;top:72px;background:var(--black);flex-direction:column;
    align-items:flex-start;padding:16px 24px 24px;gap:14px;border-bottom:2px solid var(--gold);z-index:20}
  .nav.open{display:flex}
  .menu-btn{display:inline-block}
  .site-head{position:relative}
  .head-cta{display:none}
}

/* Hero */
.hero{background:var(--black);color:var(--white);padding:64px 0 56px}
.hero h1{color:var(--white);max-width:22ch}
.hero p{color:var(--silver);max-width:58ch}
.hero .tag{color:var(--gold);font-weight:700;letter-spacing:.32em;font-size:.8rem;margin-bottom:28px}
.hero-grid{display:grid;grid-template-columns:1.05fr 1fr;gap:48px;align-items:center}
@media (max-width:900px){.hero-grid{grid-template-columns:1fr}}
.video{position:relative;aspect-ratio:16/9;background:#1C1C1C;border:1px solid var(--gold);overflow:hidden}
.video iframe,.video img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;border:0}
.video .slot{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;
  color:var(--silver);font-size:.9rem;text-align:center;padding:24px}
.hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:28px}

/* Sections */
.section{padding:64px 0}
.section.alt{background:var(--paper)}
.section.dark{background:var(--black);color:var(--white)}
.section.dark h2,.section.dark h3{color:var(--white)}
.section.dark p{color:var(--silver)}
.rule{height:2px;background:var(--gold);border:0;margin:0}
.kicker{font-weight:500;color:var(--ink-soft);margin:0 0 .5em}
.two{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:start}
.three{display:grid;grid-template-columns:repeat(3,1fr);gap:40px}
@media (max-width:860px){.two,.three{grid-template-columns:1fr;gap:32px}}

/* Proof ledger — the signature element */
.ledger{width:100%;border-collapse:collapse;margin-top:8px}
.ledger th,.ledger td{text-align:left;vertical-align:top;padding:18px 14px 18px 0;border-top:1px solid var(--silver)}
.ledger tr:last-child td{border-bottom:2px solid var(--gold)}
.ledger thead th{border-top:2px solid var(--gold);font-weight:500;color:var(--ink-soft);font-size:.9rem;padding-top:12px;padding-bottom:12px}
.ledger .fig{font-size:1.9rem;font-weight:700;line-height:1;white-space:nowrap;color:var(--black)}
.ledger .fig small{display:block;font-size:.85rem;font-weight:500;color:var(--ink-soft);margin-top:6px;white-space:normal}
.ledger .status{font-weight:700;white-space:nowrap}
.status.measured{color:var(--black)}
.status.measured::before,.status.modeled::before,.status.unmeasured::before{
  content:"";display:inline-block;width:10px;height:10px;margin-right:10px;vertical-align:1px;border:2px solid var(--gold)}
.status.measured::before{background:var(--gold)}
.status.modeled::before{background:transparent}
.status.unmeasured::before{border-color:var(--silver);background:transparent}
.ledger td.note{color:var(--ink-soft);font-size:.95rem}
@media (max-width:720px){
  .ledger thead{display:none}
  .ledger tr{display:block;padding:16px 0;border-top:1px solid var(--silver)}
  .ledger td{display:block;border:0;padding:4px 0}
  .ledger tr:last-child td{border:0}
  .ledger tr:last-child{border-bottom:2px solid var(--gold)}
}

/* Proof tiles */
.proof{display:grid;grid-template-columns:repeat(3,1fr);gap:0;border-top:2px solid var(--gold);border-bottom:2px solid var(--gold)}
.proof > div{padding:28px 24px 28px 0;border-right:1px solid var(--silver)}
.proof > div:last-child{border-right:0}
.proof > div + div{padding-left:24px}
.proof .big{font-size:2.4rem;font-weight:700;line-height:1;color:var(--black);margin-bottom:10px}
.proof p{margin:0;font-size:.98rem}
@media (max-width:860px){
  .proof{grid-template-columns:1fr}
  .proof > div{border-right:0;border-bottom:1px solid var(--silver);padding:22px 0}
  .proof > div + div{padding-left:0}
  .proof > div:last-child{border-bottom:0}
}

/* Steps (a real sequence) */
.steps{counter-reset:step;list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(3,1fr);gap:36px}
.steps li{counter-increment:step;border-top:2px solid var(--gold);padding-top:18px}
.steps li::before{content:counter(step);display:block;font-weight:700;font-size:1.6rem;color:var(--gold);margin-bottom:8px}
.steps h3{margin-bottom:.4em}
.steps p{font-size:.98rem;margin:0}
@media (max-width:860px){.steps{grid-template-columns:1fr}}

/* Definition rows */
.rows{border-top:2px solid var(--gold)}
.row{display:grid;grid-template-columns:260px 1fr;gap:24px;padding:22px 0;border-bottom:1px solid var(--silver)}
.row h3{margin:0;font-size:1.05rem}
.row p{margin:0}
@media (max-width:720px){.row{grid-template-columns:1fr;gap:8px}}

/* Figures */
figure{margin:0}
figcaption{font-size:.88rem;color:var(--ink-soft);margin-top:10px}
.render{border:1px solid var(--silver);background:var(--paper)}

/* Library */
.lib-tier{border-top:2px solid var(--gold);padding-top:22px;margin-top:40px}
.lib-tier:first-child{margin-top:0}
.paper{display:grid;grid-template-columns:1fr auto;gap:20px;padding:18px 0;border-bottom:1px solid var(--silver);align-items:center}
.paper h3{margin:0 0 4px;font-size:1.05rem}
.paper p{margin:0;font-size:.95rem;color:var(--ink-soft)}
.paper .act{white-space:nowrap;font-weight:700;font-size:.92rem}
.paper .act a{color:var(--black);text-decoration:underline;text-decoration-color:var(--gold);text-underline-offset:4px}
.paper .pending{color:var(--ink-soft);font-weight:500}
@media (max-width:640px){.paper{grid-template-columns:1fr}}

/* Forms */
form.gate{background:var(--paper);padding:28px;border-top:2px solid var(--gold);max-width:560px}
form.gate label{display:block;font-weight:500;font-size:.92rem;margin:14px 0 6px}
form.gate input{width:100%;padding:12px;border:1px solid var(--silver);font:inherit;background:var(--white)}
form.gate .btn{margin-top:20px}
form.gate .fine{font-size:.85rem;color:var(--ink-soft);margin-top:14px;margin-bottom:0}
.hidden{display:none}

/* Team */
.team{display:grid;grid-template-columns:repeat(2,1fr);gap:40px}
.person{border-top:2px solid var(--gold);padding-top:16px}
.person h3{margin-bottom:2px}
.person .role{color:var(--ink-soft);font-weight:500;margin-bottom:10px}
.person p{font-size:.98rem}
@media (max-width:720px){.team{grid-template-columns:1fr}}

/* Patents table */
.plain{width:100%;border-collapse:collapse;font-size:.95rem}
.plain th,.plain td{text-align:left;padding:12px 14px 12px 0;border-bottom:1px solid var(--silver);vertical-align:top}
.plain thead th{border-top:2px solid var(--gold);font-weight:500;color:var(--ink-soft)}

/* CTA band */
.cta{background:var(--black);color:var(--white);padding:56px 0;border-top:2px solid var(--gold)}
.cta h2{color:var(--white)}
.cta p{color:var(--silver)}

/* Footer */
.site-foot{background:var(--black);color:var(--silver);padding:44px 0 32px;font-size:.92rem;border-top:2px solid var(--gold)}
.site-foot .grid{display:grid;grid-template-columns:1.6fr 1fr 1fr;gap:32px}
.site-foot a{color:var(--white);text-decoration:none}
.site-foot a:hover{color:var(--gold)}
.site-foot p{margin:0 0 .5em;max-width:none}
.lockup{color:var(--gold);font-weight:700;letter-spacing:.12em;font-size:.74rem;line-height:1.7;margin-top:22px;white-space:nowrap}
.foot-bottom{margin-top:32px;padding-top:18px;border-top:1px solid #4A4A4A;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:.82rem}
@media (max-width:860px){.site-foot .grid{grid-template-columns:1fr}}