/* VialMath marketing-site shell — shared by /tools/, /trust/ and /building/ (control task #259).
   Same tokens, nav, footer, buttons and cards as the homepage; the homepage keeps its own inline
   styles because it carries the connected-system demo. Dark-only by design: an instrument reads dark. */
:root{
  --bg:#0B0D10; --surface:#15191E; --surface-2:#1B2028; --text:#F2F4F5; --text-2:#8C969F;
  --accent:#3D7EFF; --green:#36C98F; --amber:#E0A83A; --red:#F05D68;
  --border:rgba(242,244,245,0.12); --border-strong:rgba(242,244,245,0.20);
  --sans:"Space Grotesk",-apple-system,BlinkMacSystemFont,sans-serif;
  --mono:"IBM Plex Mono",ui-monospace,Menlo,Consolas,monospace;
}
*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; scroll-padding-top:84px; }
body{ margin:0; background:var(--bg); color:var(--text); font-family:var(--sans); font-size:16px; line-height:1.55;
  -webkit-font-smoothing:antialiased; overflow-x:hidden; }
.num, .mono, code, time{ font-family:var(--mono); font-variant-numeric:tabular-nums lining-nums; }
a{ color:inherit; }
img,svg{ max-width:100%; display:block; }
:focus-visible{ outline:2px solid var(--accent); outline-offset:3px; border-radius:4px; }
.sr-only{ position:absolute; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }
.skip{ position:absolute; left:-9999px; top:8px; z-index:30; background:var(--surface); color:var(--text); padding:10px 14px; border:1px solid var(--accent); border-radius:6px; text-decoration:none; }
.skip:focus{ left:8px; }
.wrap{ max-width:1180px; margin:0 auto; padding:0 16px; }
.wrap-narrow{ max-width:760px; margin:0 auto; padding:0 16px; }
@media (min-width:640px){ .wrap, .wrap-narrow{ padding:0 20px; } }

/* nav */
nav.topnav{ position:sticky; top:0; z-index:10; background:rgba(11,13,16,0.92); backdrop-filter:blur(6px); border-bottom:1px solid var(--border); }
.topnav-inner{ display:flex; align-items:center; justify-content:space-between; gap:12px; padding:12px 16px; max-width:1180px; margin:0 auto; }
@media (min-width:640px){ .topnav-inner{ padding:14px 20px; } }
.brand{ display:flex; align-items:center; gap:10px; text-decoration:none; min-height:44px; }
.brand svg{ width:34px; height:34px; flex:none; }
.brand-word{ font-weight:600; font-size:1.05rem; letter-spacing:-0.01em; }
.nav-links{ display:flex; align-items:center; gap:18px; font-size:0.88rem; color:var(--text-2); }
.nav-links a{ text-decoration:none; color:var(--text-2); min-height:44px; display:inline-flex; align-items:center; }
.nav-links a:hover, .nav-links a.current{ color:var(--text); }
.nav-links .nav-cta{ background:var(--accent); color:#04060a; font-weight:600; padding:0 16px; min-height:44px; border-radius:6px; font-size:0.9rem; }
.nav-links .nav-cta:hover{ color:#04060a; filter:brightness(1.08); }
.nav-links .nav-quiet{ font-family:var(--mono); font-size:0.8rem; }
@media (max-width:760px){ .nav-links a:not(.nav-cta):not(.nav-quiet){ display:none; } }

/* type */
.eyebrow{ font-family:var(--mono); font-size:0.78rem; font-weight:500; letter-spacing:0.08em; text-transform:uppercase; color:var(--text-2); margin:0 0 6px; }
h1{ font-family:var(--sans); font-weight:700; font-size:clamp(1.9rem,5vw,2.9rem); line-height:1.08; letter-spacing:-0.02em; margin:0 0 12px; }
h2{ font-family:var(--sans); font-weight:600; font-size:clamp(1.4rem,3vw,1.9rem); letter-spacing:-0.01em; margin:0 0 10px; line-height:1.15; }
h3{ font-size:1.05rem; font-weight:600; margin:0 0 8px; line-height:1.3; }
.lede{ font-size:1.05rem; color:var(--text-2); max-width:62ch; margin:0 0 22px; line-height:1.6; }
.lede b, .muted b{ color:var(--text); font-weight:600; }
.muted{ color:var(--text-2); font-size:0.95rem; max-width:64ch; }
.datum{ height:3px; width:80px; background:var(--accent); border:0; margin:14px 0; }
header.page{ padding:48px 0 32px; }
@media (min-width:920px){ header.page{ padding:64px 0 40px; } }
section{ padding:40px 0; border-top:1px solid var(--border); }
@media (min-width:920px){ section{ padding:56px 0; } }
.section-head{ max-width:680px; margin:0 0 22px; }

/* buttons */
.cta-row{ display:flex; align-items:center; gap:14px; flex-wrap:wrap; margin:18px 0 0; }
.btn{ display:inline-flex; align-items:center; justify-content:center; gap:10px; font-family:var(--sans); font-weight:600; font-size:1rem;
  padding:12px 22px; border-radius:8px; text-decoration:none; border:1px solid transparent; min-height:48px; line-height:20px; cursor:pointer; }
.btn-primary{ background:var(--accent); color:#04060a; }
.btn-primary:hover{ filter:brightness(1.08); }
.btn-secondary{ background:transparent; color:var(--text); border-color:var(--border-strong); }
.btn-secondary:hover{ border-color:var(--accent); background:rgba(61,126,255,0.08); }
.price-tag{ font-family:var(--mono); font-weight:500; font-size:0.85rem; color:var(--text-2); }

/* cards + lists */
.grid-2{ display:grid; grid-template-columns:1fr; gap:14px; }
@media (min-width:720px){ .grid-2{ grid-template-columns:repeat(2,1fr); } }
.grid-3{ display:grid; grid-template-columns:1fr; gap:14px; }
@media (min-width:720px){ .grid-3{ grid-template-columns:repeat(3,1fr); } }
.card{ background:var(--surface); border:1px solid var(--border); border-radius:12px; padding:20px; }
.card p{ color:var(--text-2); font-size:0.94rem; margin:0; line-height:1.55; }
.card p + p{ margin-top:8px; }
.card p b{ color:var(--text); font-weight:600; }
a.card{ display:block; text-decoration:none; color:var(--text); }
a.card:hover{ border-color:var(--accent); }
.card .tag{ display:inline-block; font-family:var(--mono); font-size:0.68rem; letter-spacing:0.06em; text-transform:uppercase; color:var(--accent); margin-top:10px; }
.steps{ counter-reset:step; list-style:none; padding:0; margin:0; display:flex; flex-direction:column; gap:14px; }
.steps li{ position:relative; padding-left:44px; color:var(--text-2); font-size:0.95rem; line-height:1.55; }
.steps li b{ color:var(--text); font-weight:600; display:block; margin-bottom:2px; }
.steps li::before{ counter-increment:step; content:counter(step,decimal-leading-zero); position:absolute; left:0; top:2px; font-family:var(--mono); color:var(--accent); font-weight:600; font-size:0.85rem; }
.steps code{ font-size:0.88em; }
.pills{ display:flex; flex-wrap:wrap; gap:8px; margin:10px 0 0; }
.pill{ font-family:var(--mono); font-size:0.78rem; border:1px solid var(--border-strong); border-radius:20px; padding:6px 11px; }
.tests-link{ display:inline-flex; align-items:center; gap:8px; padding:12px 16px; min-height:48px; border:1px solid var(--border-strong);
  border-radius:8px; text-decoration:none; font-family:var(--mono); font-size:0.85rem; color:var(--text); }
.tests-link:hover{ border-color:var(--accent); color:var(--accent); }
.bridge{ background:var(--surface); border:1px solid var(--border); border-radius:12px; padding:22px; }
.bridge p{ margin:0 0 4px; }
.honest{ font-size:0.9rem; color:var(--text-2); border-left:3px solid var(--accent); padding-left:12px; margin:18px 0 0; max-width:62ch; }

/* footer */
footer{ border-top:1px solid var(--border); padding:40px 0 60px; margin-top:40px; }
.footer-cols{ display:grid; grid-template-columns:1fr 1fr; gap:24px 18px; margin-bottom:28px; }
@media (min-width:720px){ .footer-cols{ grid-template-columns:repeat(5,1fr); } }
.footer-cols h3{ font-family:var(--mono); font-size:0.72rem; letter-spacing:0.08em; text-transform:uppercase; color:var(--text-2); margin:0 0 10px; }
.footer-cols a{ display:flex; align-items:center; min-height:44px; text-decoration:none; color:var(--text); font-size:0.92rem; padding:4px 0; }
.footer-cols a:hover{ color:var(--accent); }
.footer-sig{ font-family:var(--mono); font-size:0.72rem; letter-spacing:0.04em; color:var(--text-2); text-transform:uppercase; }

@media (prefers-reduced-motion: reduce){ html{ scroll-behavior:auto; } *{ transition:none !important; animation:none !important; } }