/* Neurophi: baudlabs-style austere black & white. Sharp corners, light theme only. */

/* Full-bleed hero: background video fills the first screen, text overlaid bottom-left.
   Placeholder shows until assets/hero.mp4 is added. */
.hero{position:relative;min-height:100vh;min-height:100svh;overflow:hidden;
  background:var(--ink);display:flex;align-items:flex-end;color:#fff}
.hero-bg{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;z-index:0}
.hero-ph{position:absolute;inset:0;z-index:0;display:flex;align-items:center;justify-content:center;
  font:600 14px/1 var(--sans);letter-spacing:.22em;text-transform:uppercase;color:#3a3a40}
.hero-scrim{position:absolute;inset:0;z-index:1;
  background:linear-gradient(to top,rgba(0,0,0,.86) 0%,rgba(0,0,0,.55) 26%,rgba(0,0,0,.28) 55%,rgba(0,0,0,.14) 100%),
  linear-gradient(to right,rgba(0,0,0,.5) 0%,rgba(0,0,0,.12) 42%,rgba(0,0,0,0) 70%)}
.hero-content{position:relative;z-index:2;width:100%;padding:140px 0 76px}
.hero-kicker{display:inline-block;font-size:13px;font-weight:600;letter-spacing:.18em;
  text-transform:uppercase;color:rgba(255,255,255,.9);margin-bottom:26px;
  text-shadow:0 1px 12px rgba(0,0,0,.6)}
.hero h1{color:#fff;font-size:clamp(46px,7.6vw,94px);line-height:1.02;letter-spacing:-.02em;
  font-weight:700;margin:0;max-width:15ch;text-shadow:0 2px 30px rgba(0,0,0,.55)}
.hero .lead{color:#fff;margin-top:24px;max-width:52ch;
  font-size:clamp(16px,1.6vw,19px);text-shadow:0 1px 16px rgba(0,0,0,.6)}
.hero .btn-row{margin-top:36px}
/* Secondary hero button: same dark box as the primary, but a crisp white border for
   visibility. No white fill, no blur (blur causes scroll jank). */
.btn-hero-ghost{background:rgba(11,11,12,.68);color:#fff;border:1px solid #fff}
.btn-hero-ghost:hover{background:rgba(11,11,12,.86);border-color:#fff}

/* Verified-numbers strip directly under the hero (white). */
.figs-strip{padding:54px 0;border-bottom:1px solid var(--line)}

/* Transparent nav over the full-bleed hero on the home page; solid after scroll. */
body.home .nav{position:fixed;top:0;left:0;right:0;background:transparent;border-bottom-color:transparent}
body.home .nav .brand{color:#fff}
body.home .nav .brand img{filter:invert(1)}
body.home .nav-links a{color:rgba(255,255,255,.82)}
body.home .nav-links a:hover,body.home .nav-links a[aria-current="page"]{color:#fff}
body.home .nav-toggle{color:#fff}
body.home .nav.solid{background:#fff;border-bottom-color:var(--line)}
body.home .nav.solid .brand{color:var(--ink)}
body.home .nav.solid .brand img{filter:none}
body.home .nav.solid .nav-links a{color:var(--muted)}
body.home .nav.solid .nav-links a:hover,body.home .nav.solid .nav-links a[aria-current="page"]{color:var(--ink)}
body.home .nav.solid .nav-toggle{color:var(--ink)}

:root{
  --bg:#FFFFFF;
  --ink:#0B0B0C;        /* near-black: headings, buttons, primary text */
  --body:#27272A;       /* readable body copy */
  --muted:#9CA3AF;      /* secondary text, meta, links, captions */
  --line:#E5E7EB;       /* thin borders / rules */
  --line-strong:#0B0B0C;
  --sans:'Plus Jakarta Sans',ui-sans-serif,system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
  --measure:720px;
  --wide:1040px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
body{
  margin:0;background:var(--bg);color:var(--body);
  font-family:var(--sans);font-size:18px;line-height:1.65;
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
}
img{max-width:100%;display:block}
a{color:var(--ink);text-decoration:none}
a:hover{text-decoration:underline}

/* Layout ------------------------------------------------------------ */
.wrap{max-width:var(--wide);margin:0 auto;padding:0 28px}
.measure{max-width:var(--measure);margin:0 auto}
section{padding:84px 0;border-top:1px solid var(--line)}
section:first-of-type{border-top:none}

/* Skip link --------------------------------------------------------- */
.skip{position:absolute;left:-9999px;top:0;background:var(--ink);color:#fff;padding:10px 16px;z-index:200}
.skip:focus{left:12px;top:12px}

/* Focus states ------------------------------------------------------ */
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{
  outline:2px solid var(--ink);outline-offset:3px;border-radius:0
}

/* Nav --------------------------------------------------------------- */
.nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.96);
  border-bottom:1px solid var(--line)}
.nav .inner{max-width:var(--wide);margin:0 auto;padding:0 28px;
  height:68px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:flex;align-items:center;gap:11px;font-weight:600;font-size:20px;
  letter-spacing:-.02em;color:var(--ink);white-space:nowrap}
.brand:hover{text-decoration:none}
.brand img{width:30px;height:30px}
.nav-links{display:flex;align-items:center;gap:22px;flex-wrap:wrap}
.nav-links a{font-size:14.5px;color:var(--muted);white-space:nowrap}
.nav-links a:hover{color:var(--ink);text-decoration:none}
.nav-links a[aria-current="page"]{color:var(--ink);font-weight:600}
.nav-toggle{display:none}
@media (max-width:900px){
  .nav-links{display:none}
  .nav-links.open{display:flex;position:absolute;top:68px;left:0;right:0;
    flex-direction:column;align-items:flex-start;gap:0;background:#fff;
    border-bottom:1px solid var(--line);padding:8px 28px 18px}
  .nav-links.open a{padding:11px 0;width:100%;border-bottom:1px solid var(--line);font-size:16px}
  .nav-toggle{display:inline-flex;align-items:center;justify-content:center;
    width:44px;height:40px;background:#fff;border:1px solid var(--ink);color:var(--ink);
    cursor:pointer;font-size:18px}
}

/* Buttons ----------------------------------------------------------- */
.btn{display:inline-flex;align-items:center;gap:8px;font-family:var(--sans);
  font-weight:600;font-size:15px;line-height:1;letter-spacing:.01em;
  padding:15px 22px;border-radius:0;border:1px solid var(--ink);cursor:pointer;
  text-decoration:none;transition:background .15s ease,color .15s ease}
.btn:hover{text-decoration:none}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:#000}
.btn-secondary{background:#fff;color:var(--ink)}
.btn-secondary:hover{background:var(--ink);color:#fff}
.btn-row{display:flex;gap:14px;flex-wrap:wrap;margin-top:34px}

/* Type -------------------------------------------------------------- */
.eyebrow{font-size:13px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;
  color:var(--muted);margin:0 0 22px}
h1{font-weight:700;letter-spacing:-.035em;line-height:1.03;color:var(--ink);
  font-size:clamp(42px,7vw,72px);margin:0;text-wrap:balance}
h2{font-weight:700;letter-spacing:-.025em;line-height:1.1;color:var(--ink);
  font-size:clamp(28px,4vw,42px);margin:0 0 20px;text-wrap:balance}
h3{font-weight:600;letter-spacing:-.015em;color:var(--ink);
  font-size:21px;line-height:1.25;margin:0 0 10px}
p{margin:0 0 20px}
.lead{font-size:clamp(18px,2.2vw,22px);line-height:1.55;color:var(--body)}
.muted{color:var(--muted)}
.section-head{margin-bottom:40px}
strong{font-weight:600;color:var(--ink)}
.small{font-size:14.5px;line-height:1.6}
a.inline{color:var(--ink);text-decoration:underline;text-underline-offset:2px;
  text-decoration-color:var(--muted)}
a.inline:hover{text-decoration-color:var(--ink)}

/* Hero -------------------------------------------------------------- */
/* Number band ------------------------------------------------------- */
.figs{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);margin-top:52px}
.figs .fig{padding:28px 26px;border-left:1px solid var(--line)}
.figs .fig:first-child{border-left:none}
.figs .n{font-size:34px;font-weight:700;letter-spacing:-.03em;color:var(--ink);line-height:1}
.figs .l{margin:12px 0 0;font-size:14px;line-height:1.5;color:var(--muted)}
@media (max-width:720px){.figs{grid-template-columns:1fr}
  .figs .fig{border-left:none;border-top:1px solid var(--line)}
  .figs .fig:first-child{border-top:none}}

/* Card grid --------------------------------------------------------- */
.grid{display:grid;gap:0;border:1px solid var(--line);margin-top:8px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid .cell{padding:34px 32px;border-left:1px solid var(--line);border-top:1px solid var(--line)}
.grid-3 .cell:nth-child(-n+3){border-top:none}
.grid-3 .cell:nth-child(3n+1){border-left:none}
.grid-2 .cell:nth-child(-n+2){border-top:none}
.grid-2 .cell:nth-child(2n+1){border-left:none}
.grid .cell .idx{font-size:13px;font-weight:600;letter-spacing:.1em;color:var(--muted);margin-bottom:16px}
.grid .cell p:last-child{margin-bottom:0}
@media (max-width:820px){
  .grid-3,.grid-2{grid-template-columns:1fr}
  .grid .cell{border-left:none;border-top:1px solid var(--line)}
  .grid .cell:first-child{border-top:none}
}

/* Steps (numbered rows) --------------------------------------------- */
.steps{margin-top:8px;border-top:1px solid var(--line)}
.step{display:grid;grid-template-columns:88px 1fr;gap:24px;
  padding:32px 0;border-bottom:1px solid var(--line)}
.step .snum{font-size:15px;font-weight:600;color:var(--muted);letter-spacing:.02em;padding-top:3px}
.step h3{margin-top:0}
.step p:last-child{margin-bottom:0}
@media (max-width:620px){.step{grid-template-columns:1fr;gap:8px}}

/* Callout / example box --------------------------------------------- */
.box{border:1px solid var(--ink);padding:30px 32px;margin-top:36px}
.box .tag{font-size:12.5px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;
  color:var(--muted);margin-bottom:14px}
.box .big{font-size:clamp(22px,3vw,30px);font-weight:700;letter-spacing:-.02em;
  color:var(--ink);line-height:1.2;margin:0}
.box p:last-child{margin-bottom:0}

/* Definition-style list --------------------------------------------- */
.deflist{margin:0;padding:0;list-style:none;border-top:1px solid var(--line)}
.deflist li{padding:20px 0;border-bottom:1px solid var(--line)}
.deflist .k{font-weight:600;color:var(--ink);margin-bottom:4px}
.deflist .v{color:var(--body);margin:0}
.deflist .v:last-child{margin-bottom:0}

/* FAQ (details) ----------------------------------------------------- */
.faq{border-top:1px solid var(--line);margin-top:8px}
.faq details{border-bottom:1px solid var(--line)}
.faq summary{list-style:none;cursor:pointer;padding:26px 40px 26px 0;position:relative;
  font-weight:600;font-size:19px;color:var(--ink);letter-spacing:-.01em}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";position:absolute;right:2px;top:50%;transform:translateY(-50%);
  font-size:24px;font-weight:400;color:var(--muted)}
.faq details[open] summary::after{content:"–"}
.faq .a{padding:0 0 28px;color:var(--body);max-width:64ch}
.faq .a p:last-child{margin-bottom:0}
.faq-group{font-size:13px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;
  color:var(--muted);margin:48px 0 4px}
.faq-group:first-of-type{margin-top:0}

/* Waitlist form ----------------------------------------------------- */
.form-wrap{max-width:560px;margin-top:36px}
form.wl{display:flex;flex-direction:column;border:1px solid var(--ink)}
form.wl input{font-family:var(--sans);font-size:16px;color:var(--ink);
  background:#fff;border:none;padding:16px 18px;outline:none;width:100%}
form.wl input+input{border-top:1px solid var(--line)}
form.wl input::placeholder{color:var(--muted)}
form.wl button{border:none;border-top:1px solid var(--ink);white-space:nowrap;padding:16px 24px;width:100%}
.wl-msg{font-size:14.5px;margin:16px 0 0;min-height:20px}
.wl-msg.ok{color:#0B0B0C}
.wl-msg.err{color:#0B0B0C;font-weight:600}
.wl-note{font-size:13.5px;color:var(--muted);margin-top:14px}

/* Vision line ------------------------------------------------------- */
.vision{padding:96px 0}
.vision p{font-size:clamp(24px,3.4vw,38px);font-weight:600;letter-spacing:-.025em;
  line-height:1.22;color:var(--ink);margin:0;text-wrap:balance}
.vision .sub{font-size:16px;font-weight:400;color:var(--muted);letter-spacing:0;margin-top:20px}

/* Footer ------------------------------------------------------------ */
footer{background:var(--ink);color:#9CA3AF;padding:64px 0 40px}
footer a{color:#E5E7EB}
footer a:hover{color:#fff}
footer .top{display:flex;justify-content:space-between;flex-wrap:wrap;gap:32px;
  padding-bottom:44px;border-bottom:1px solid #26262A}
footer .brand{color:#fff}
footer .fcol h4{font-size:12.5px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;
  color:#6B7280;margin:0 0 16px}
footer .fcol a{display:block;font-size:15px;margin-bottom:10px;color:#D1D5DB}
footer .fcols{display:flex;gap:64px;flex-wrap:wrap}
footer .appendix{padding-top:44px}
footer .appendix h4{font-size:12.5px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;
  color:#6B7280;margin:0 0 18px}
footer .appendix .measure{margin:0}
footer .appendix p,footer .appendix li{font-size:14px;line-height:1.7;color:#9CA3AF}
footer .appendix strong{color:#E5E7EB}
footer .appendix ul{margin:0 0 18px;padding-left:20px}
footer .appendix .refs{list-style:none;padding:0;margin:22px 0 0;border-top:1px solid #26262A;padding-top:22px}
footer .appendix .refs li{margin-bottom:12px;font-size:13px}
footer .appendix .refs a{color:#D1D5DB;text-decoration:underline;text-underline-offset:2px}
footer .legal{margin-top:44px;padding-top:24px;border-top:1px solid #26262A;
  display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:13px;color:#6B7280}

/* Reveal (gated on .js so content is always visible without JavaScript) */
html.js .reveal{opacity:0;transform:translateY(14px);transition:opacity .6s ease,transform .6s ease}
html.js .reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  html.js .reveal{opacity:1;transform:none;transition:none}
}

.page-hero{padding:88px 0 20px}
.page-hero .eyebrow{margin-bottom:22px}

/* ---- Lite marketing variant additions ---- */
/* Emphasized "Join the waitlist" nav link, adapts to nav text color */
.navcta{border:1px solid currentColor;padding:7px 15px;font-weight:600}
.navcta:hover{opacity:.68;text-decoration:none}

/* Alternating light section */
.alt{background:#F6F6F7}

/* Waitlist conversion band */
.join-band{background:#F6F6F7;border-top:1px solid var(--line)}

/* Simple page header (non-home pages, e.g. contact) */
.page-head{padding:96px 0 24px}

/* Keep the hero video on its own GPU layer so scrolling doesn't repaint it (smoother scroll) */
.hero-bg{transform:translateZ(0);backface-visibility:hidden}
.hero{contain:layout paint}

/* Honeypot: off-screen spam trap, never shown to humans */
.hp{position:absolute!important;left:-9999px!important;top:auto;width:1px;height:1px;
  padding:0!important;border:0!important;opacity:0;overflow:hidden}

/* ---- Mobile ---- */
/* Fix: on the transparent home hero the toggle was a white box with a white icon
   (invisible). Make it transparent with a white outline; solid nav flips it dark. */
body.home .nav-toggle{background:transparent;border-color:rgba(255,255,255,.7)}
body.home .nav.solid .nav-toggle{background:#fff;border-color:var(--ink)}

@media (max-width:600px){
  .wrap{padding:0 20px}
  section{padding:56px 0}
  .hero-content{padding:104px 0 48px}
  .hero h1{font-size:clamp(32px,9.2vw,50px)}
  .hero .lead{font-size:16px;margin-top:20px}
  .hero-kicker{margin-bottom:20px;font-size:12px}
  /* stacked, full-width hero buttons are easier to tap */
  .hero .btn-row{flex-direction:column;align-items:stretch;gap:12px;margin-top:28px}
  .hero .btn-row .btn{width:100%;justify-content:center}
  .figs-strip{padding:40px 0}
  .box{padding:24px 20px}
  .vision{padding:60px 0}
  .page-head{padding:80px 0 18px}
  /* footer: shrink the big brand mark so it never overflows, stack columns */
  footer{padding:52px 0 32px}
  footer .top{flex-direction:column;gap:28px}
  footer .fcols{gap:36px}
  footer .legal{flex-direction:column;gap:8px}
}

/* Fix: opened mobile menu panel is white, so home's white links were invisible.
   Make the open menu's links dark. */
body.home .nav-links.open a{color:var(--body)}
body.home .nav-links.open a:hover,
body.home .nav-links.open a[aria-current="page"]{color:var(--ink)}

/* Footer logo lockup on the golden ratio: mark height = 1.618 x wordmark size,
   locked in em so it scales together; responsive via clamp; centered by align-items. */
footer .brand{font-size:clamp(30px,5.4vw,50px);gap:.42em}
footer .brand img{width:1.618em;height:1.618em;flex:none}