body {
  background-color: var(--bg-subtle);
  background-image: var(--bp-grid);
  background-attachment: fixed;
}

/* ── Nav ──────────────────────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 40;
  background: rgba(10,14,15,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: .8rem 24px;
  display: flex; align-items: center; gap: 1.5rem;
}
.brand {
  font-family: var(--display); font-size: 1.7rem; letter-spacing: .04em;
  color: var(--text); text-decoration: none; line-height: 1;
}
.brand .accent { color: var(--dew); }
.nav-links { display: flex; gap: .2rem; margin-left: auto; }
.nav-links a {
  font-family: var(--mono); color: var(--muted); font-weight: 500;
  font-size: var(--fs-label); letter-spacing: .10em; text-transform: uppercase;
  padding: .45rem .8rem;
  transition: color var(--dur) var(--ease);
}
.nav-links a:hover { color: var(--text); }
.nav-cta { display: flex; gap: .6rem; align-items: center; }
@media (max-width: 820px) { .nav-links { display: none; } }

section { padding: 5rem 0; }
.sec-head { max-width: 600px; margin: 0 auto 3rem; text-align: center; }
.sec-head h2 { font-size: clamp(1.9rem, 3.4vw, 2.8rem); margin-top: .5rem; }
.sec-head p { color: var(--muted2); font-size: var(--fs-lead); margin-top: .8rem; }

/* ── Hero ─────────────────────────────────────────────────────────────── */
.hero { padding: 4.5rem 0 5rem; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 3.5rem; align-items: center; }
@media (max-width: 940px) { .hero-grid { grid-template-columns: 1fr; gap: 2.5rem; } }
.hero h1 { font-size: var(--fs-hero); line-height: .95; margin-top: 1rem; }
.hero h1 .accent { color: var(--dew); }
.hero .lead {
  font-size: var(--fs-lead); color: var(--muted2);
  margin-top: 1.3rem; max-width: 38ch; line-height: 1.65;
}
.hero-cta { display: flex; gap: .8rem; margin-top: 2rem; flex-wrap: wrap; }
.hero-meta { display: flex; gap: 1.6rem; margin-top: 2.3rem; flex-wrap: wrap; }
.hero-meta .m { display: flex; flex-direction: column; }
.hero-meta .m .n {
  font-family: var(--display); font-size: 2rem; letter-spacing: .04em;
  color: var(--dew); line-height: 1;
}
.hero-meta .m .l { font-family: var(--mono); font-size: var(--fs-label); color: var(--muted); letter-spacing: .06em; margin-top: .2rem; }
.hero-meta .div { width: 1px; background: var(--border-strong); }

/* hero product preview */
.preview { position: relative; }
.preview .card { box-shadow: none; padding: 0; overflow: hidden; }
.pv-hero {
  background: var(--bg-navy); color: var(--text);
  padding: 1.4rem 1.5rem; position: relative; overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.pv-hero::after {
  content:""; position:absolute; right:-30px; top:-30px; width:140px; height:140px;
  border-radius:50%;
  background: radial-gradient(circle, rgba(92,209,194,.15), transparent 70%);
}
.pv-hero .eyebrow { color: var(--muted2); }
.pv-hero .big {
  font-family: var(--display); font-size: 2.4rem; letter-spacing: .04em;
  margin-top: .35rem; color: var(--text); line-height: 1;
}
.pv-hero .big .cur { font-family: var(--mono); font-size: .8rem; color: var(--muted2); margin-left: .3rem; }
.pv-body { padding: 1.3rem 1.5rem 1.5rem; background: var(--bg); }
.pv-chips { display: flex; gap: .5rem; margin-bottom: 1rem; }
.pv-chip { flex: 1; background: var(--bg-sunken); border: 1px solid var(--border); padding: .55rem .65rem; }
.pv-chip .k { font-family: var(--mono); font-size: 9px; text-transform: uppercase; letter-spacing: .10em; color: var(--muted); font-weight: 500; }
.pv-chip .v { font-family: var(--mono); font-size: 1rem; color: var(--dew); font-weight: 500; margin-top: .15rem; }
.pv-label { display: flex; justify-content: space-between; font-family: var(--mono); font-size: var(--fs-label); color: var(--muted); margin-bottom: .5rem; letter-spacing: .03em; }
.pv-label b { color: var(--muted2); font-weight: 500; }
.pv-float {
  position: absolute;
  background: var(--bg); border: 1px solid var(--border-strong);
  padding: .65rem .9rem;
}
.pv-float .t { font-family: var(--mono); font-size: var(--fs-label); color: var(--muted); letter-spacing: .03em; }
.pv-float .t b { display: block; color: var(--dew); font-size: var(--fs-sm); margin-top: .1rem; }
.pv-float.f1 { bottom: -22px; left: -26px; }
@media (max-width: 940px) { .pv-float.f1 { left: 0; } }

/* ── Domain band ──────────────────────────────────────────────────────── */
.domains { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); }
@media (max-width: 760px) { .domains { grid-template-columns: 1fr; } }
.domain { padding: 1.6rem 1.5rem; background: var(--bg); }
.domain-num {
  font-family: var(--display); font-size: 2rem; color: var(--dew-dim);
  letter-spacing: .04em; line-height: 1; margin-bottom: .8rem;
}
.domain h3 { margin-bottom: .45rem; color: var(--text); }
.domain p { color: var(--muted2); font-size: var(--fs-sm); }

/* ── Steps ────────────────────────────────────────────────────────────── */
.steps { display: grid; grid-template-columns: repeat(3,1fr); gap: 1.5rem; }
@media (max-width: 760px) { .steps { grid-template-columns: 1fr; } }
.step { position: relative; padding-top: .5rem; }
.step .n {
  font-family: var(--display); font-size: 2.8rem; color: var(--dew-dim);
  letter-spacing: .04em; line-height: 1; margin-bottom: .8rem;
}
.step h3 { margin-bottom: .45rem; color: var(--text); }
.step p { color: var(--muted2); font-size: var(--fs-body); }

/* ── Features ─────────────────────────────────────────────────────────── */
.features { display: grid; grid-template-columns: repeat(3,1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); }
@media (max-width: 900px) { .features { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .features { grid-template-columns: 1fr; } }
.feat { padding: 1.5rem; background: var(--bg); }
.feat h3 { margin-bottom: .45rem; color: var(--dew); }
.feat p { color: var(--muted2); font-size: var(--fs-sm); }
.feat-compare {
  grid-column: 1 / -1;
  display: flex; align-items: center; justify-content: space-between; gap: 2rem; flex-wrap: wrap;
  background: var(--bg-navy); border-left: 3px solid var(--dew-dim);
}
.feat-compare h3 { margin-bottom: .45rem; color: var(--dew); }
.feat-compare p  { color: var(--muted2); font-size: var(--fs-sm); max-width: 52ch; }

/* ── Model explainer ──────────────────────────────────────────────────── */
.model-grid h2 { margin: .6rem 0 1rem; }
.model-cta { margin-top: 1.8rem; }
.formula-eyebrow { text-align: center; }
.model { background: var(--bg-1); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }
.model-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 3rem; align-items: center; }
@media (max-width: 860px) { .model-grid { grid-template-columns: 1fr; } }
.formula-card {
  background: var(--bg-navy);
  border: 1px solid var(--border-strong);
  border-left: 3px solid var(--dew-dim);
  padding: 2.2rem; color: var(--text);
}
.formula-card .f {
  font-family: var(--mono); font-size: 1.5rem; letter-spacing: -.01em;
  text-align: center; margin: .8rem 0 1.6rem; color: var(--text);
}
.formula-card .f .hl { color: var(--dew); }
.leg { display: flex; flex-direction: column; gap: .9rem; }
.leg-row { display: flex; gap: .9rem; align-items: baseline; }
.leg-row .sym { font-family: var(--mono); color: var(--dew); font-weight: 500; width: 1.4rem; flex-shrink: 0; }
.leg-row .desc { color: var(--muted2); font-size: var(--fs-sm); }
.leg-row .desc b { color: var(--text); font-weight: 500; }
.model-list { display: flex; flex-direction: column; gap: 1.1rem; list-style: none; }
.model-list li { display: flex; gap: .8rem; }
.model-list .li-mark { color: var(--dew-dim); font-family: var(--mono); font-weight: 500; flex-shrink: 0; margin-top: 2px; }
.model-list b { color: var(--text); font-weight: 500; }
.model-list span { color: var(--muted2); }

/* ── CTA ──────────────────────────────────────────────────────────────── */
.section-cta { padding-top: 0; padding-bottom: 4rem; }
.cta-band {
  background: var(--bg-navy);
  border: 1px solid var(--border-strong);
  border-left: 3px solid var(--dew-dim);
  padding: 3.5rem; text-align: center; position: relative; overflow: hidden;
}
.cta-band::before {
  content:""; position:absolute; inset:0;
  background: radial-gradient(ellipse 700px 350px at 50% -20%, rgba(92,209,194,.06), transparent 60%);
}
.cta-band > * { position: relative; }
.cta-band h2 { color: var(--text); font-size: clamp(1.8rem,3vw,2.8rem); }
.cta-band p { color: var(--muted2); font-size: var(--fs-lead); margin: .8rem auto 2rem; max-width: 48ch; }

/* ── Footer ───────────────────────────────────────────────────────────── */
.foot-brand-col { max-width: 260px; }
.foot-tagline { color: var(--muted2); font-size: var(--fs-sm); margin-top: .6rem; }
footer { border-top: 1px solid var(--border); padding: 3rem 0 2.5rem; }
.foot-grid { display: flex; justify-content: space-between; gap: 2rem; flex-wrap: wrap; }
.foot-grid .col { display: flex; flex-direction: column; gap: .6rem; }
.foot-grid .col h4 {
  font-family: var(--mono); font-size: var(--fs-label); text-transform: uppercase;
  letter-spacing: .10em; color: var(--muted); margin-bottom: .3rem; font-weight: 500;
}
.foot-grid .col a { color: var(--muted2); font-size: var(--fs-sm); transition: color var(--dur) var(--ease); }
.foot-grid .col a:hover { color: var(--dew); }
.foot-bot {
  margin-top: 2.5rem; padding-top: 1.5rem; border-top: 1px solid var(--border);
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem;
  color: var(--muted); font-family: var(--mono); font-size: var(--fs-label); letter-spacing: .03em;
}

/* section alternation */
#how { background: var(--bg-1); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }