/* ============================================================
   Veriphage — instrument-panel aesthetic
   FAM (teal-green) + HEX (amber) two-channel ddPCR motif
   ============================================================ */

:root {
  /* surfaces */
  --ink:        #070b10;
  --ink-2:      #0b1118;
  --panel:      #0e1620;
  --panel-2:    #111c28;
  --line:       rgba(150, 178, 200, 0.12);
  --line-strong:rgba(150, 178, 200, 0.22);

  /* text */
  --text:       #e9eff4;
  --muted:      #93a3b2;
  --muted-2:    #6b7c8c;

  /* fluorophore channels */
  --fam:        #36e0a6;   /* primary accent — green */
  --fam-soft:   rgba(54, 224, 166, 0.14);
  --fam-glow:   rgba(54, 224, 166, 0.55);
  --hex:        #f6b53f;   /* secondary accent — amber */
  --hex-glow:   rgba(246, 181, 63, 0.5);

  /* type */
  --serif: "Newsreader", Georgia, serif;
  --sans:  "Hanken Grotesk", system-ui, sans-serif;
  --mono:  "IBM Plex Mono", ui-monospace, monospace;

  --wrap: 1180px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--sans);
  background: var(--ink);
  color: var(--text);
  line-height: 1.6;
  font-size: 17px;
  letter-spacing: -0.005em;
  overflow-x: hidden;
  /* atmospheric glow */
  background-image:
    radial-gradient(900px 540px at 78% -8%, rgba(54, 224, 166, 0.10), transparent 60%),
    radial-gradient(720px 520px at 0% 30%, rgba(246, 181, 63, 0.045), transparent 55%);
  background-attachment: fixed;
}

::selection { background: var(--fam); color: var(--ink); }

a { color: inherit; text-decoration: none; }

/* film grain overlay */
.grain {
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  opacity: 0.4; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
}

/* ---------- shared layout ---------- */
.wrap { width: min(var(--wrap), 90vw); margin-inline: auto; }

.section { position: relative; padding: clamp(5rem, 11vw, 9.5rem) 0; z-index: 2; }
.section + .section { border-top: 1px solid var(--line); }

.eyebrow {
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--muted);
  display: inline-flex; align-items: center; gap: 0.7em;
  margin-bottom: 1.6rem;
}
.eyebrow__dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--fam);
  box-shadow: 0 0 0 4px var(--fam-soft), 0 0 12px var(--fam-glow);
}

.section__title {
  font-family: var(--serif);
  font-weight: 500;
  font-size: clamp(2rem, 4.6vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 18ch;
}
.muted-serif { color: var(--muted); font-style: italic; font-weight: 400; }

.section__lead {
  margin-top: 1.6rem;
  max-width: 56ch;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.6vw, 1.22rem);
  line-height: 1.62;
}

/* ---------- buttons ---------- */
.btn {
  --bg: transparent;
  display: inline-flex; align-items: center; gap: 0.55em;
  font-family: var(--sans); font-weight: 600; font-size: 0.96rem;
  letter-spacing: -0.01em;
  padding: 0.85em 1.5em;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--bg);
  color: var(--text);
  cursor: pointer;
  transition: transform 0.4s var(--ease), background 0.3s, border-color 0.3s, box-shadow 0.4s var(--ease), color 0.3s;
  will-change: transform;
}
.btn:hover { transform: translateY(-2px); }
.btn--sm { padding: 0.62em 1.15em; font-size: 0.85rem; }
.btn--lg { padding: 1.05em 2em; font-size: 1.05rem; }

.btn--primary {
  background: var(--fam);
  color: #06231a;
  border-color: var(--fam);
  box-shadow: 0 0 0 0 var(--fam-glow);
}
.btn--primary:hover {
  box-shadow: 0 14px 40px -10px var(--fam-glow), 0 0 24px -4px var(--fam-glow);
}
.btn--ghost { color: var(--muted); }
.btn--ghost:hover { color: var(--text); border-color: var(--line-strong); background: rgba(255,255,255,0.02); }

/* ============ NAV ============ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 50;
  transition: background 0.4s, border-color 0.4s, backdrop-filter 0.4s;
  border-bottom: 1px solid transparent;
}
.nav.is-stuck {
  background: rgba(7, 11, 16, 0.72);
  backdrop-filter: blur(14px) saturate(140%);
  -webkit-backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--line);
}
.nav__inner {
  width: min(var(--wrap), 90vw); margin-inline: auto;
  height: 72px;
  display: flex; align-items: center; gap: 2rem;
}
.brand { display: inline-flex; align-items: center; gap: 0.55em; }
.brand__mark { color: var(--fam); display: inline-flex; filter: drop-shadow(0 0 6px var(--fam-soft)); }
.brand__name {
  font-family: var(--serif); font-weight: 600; font-size: 1.3rem;
  letter-spacing: -0.01em;
}
.nav__links {
  display: flex; gap: 1.9rem; margin-left: auto;
  font-size: 0.93rem; color: var(--muted);
}
.nav__links a { position: relative; transition: color 0.25s; }
.nav__links a::after {
  content: ""; position: absolute; left: 0; bottom: -5px; height: 1px; width: 0;
  background: var(--fam); transition: width 0.3s var(--ease);
}
.nav__links a:hover { color: var(--text); }
.nav__links a:hover::after { width: 100%; }
.nav__cta { margin-left: 0.5rem; }

/* ============ HERO ============ */
.hero { position: relative; padding: clamp(8rem, 16vh, 11rem) 0 clamp(3rem, 6vw, 5rem); z-index: 2; }
.hero__grid {
  width: min(var(--wrap), 90vw); margin-inline: auto;
  display: grid; grid-template-columns: 1.05fr 0.95fr; gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.hero__title {
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(2.9rem, 7vw, 5.4rem);
  line-height: 1.02; letter-spacing: -0.03em;
  margin: 0.4rem 0 1.6rem;
}
.hero__title .line { display: block; }
.accent-em { color: var(--fam); font-style: italic; font-weight: 500; }
.hero__sub {
  max-width: 46ch; color: var(--muted);
  font-size: clamp(1.05rem, 1.7vw, 1.28rem); line-height: 1.6;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 2.2rem; }
.hero__tags { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-top: 2.4rem; }
.tag {
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.04em;
  color: var(--muted); padding: 0.42em 0.85em;
  border: 1px solid var(--line); border-radius: 999px;
  background: rgba(255,255,255,0.015);
}

.hero__rule {
  width: min(var(--wrap), 90vw); margin: clamp(3rem, 7vw, 5.5rem) auto 0;
  height: 1px; background: linear-gradient(90deg, var(--line-strong), transparent);
}

/* ---- droplet reader ---- */
.reader {
  background:
    linear-gradient(180deg, var(--panel-2), var(--panel));
  border: 1px solid var(--line-strong);
  border-radius: 18px;
  padding: 1.1rem 1.1rem 0.9rem;
  box-shadow:
    0 40px 80px -40px rgba(0,0,0,0.8),
    inset 0 1px 0 rgba(255,255,255,0.04);
  position: relative;
}
.reader::before {
  content: ""; position: absolute; inset: 0; border-radius: 18px; pointer-events: none;
  background: radial-gradient(120% 80% at 80% 0%, rgba(54,224,166,0.08), transparent 55%);
}
.reader__head, .reader__foot {
  display: flex; justify-content: space-between; align-items: center;
  font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.04em;
  color: var(--muted-2);
}
.reader__head { margin-bottom: 0.85rem; }
.reader__foot { margin-top: 0.85rem; }
.reader__label { color: var(--muted); }
.reader__chan { display: inline-flex; align-items: center; gap: 0.45em; }
.reader__chan .dot { width: 7px; height: 7px; border-radius: 50%; }
.dot--fam { background: var(--fam); box-shadow: 0 0 8px var(--fam-glow); }
.dot--hex { background: var(--hex); box-shadow: 0 0 8px var(--hex-glow); margin-left: 0.4em; }
.reader__count { color: var(--fam); }

.reader__field {
  display: grid;
  grid-template-columns: repeat(26, 1fr);
  gap: 4px;
  aspect-ratio: 1 / 0.86;
  background: var(--ink);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 12px;
}
.dpl {
  border-radius: 50%;
  background: rgba(120, 150, 175, 0.10);
  transform: scale(0);
  transition: transform 0.5s var(--ease), background 0.6s, box-shadow 0.6s;
}
.dpl.in { transform: scale(1); }
.dpl.pos-fam { background: var(--fam); box-shadow: 0 0 7px var(--fam-glow); }
.dpl.pos-hex { background: var(--hex); box-shadow: 0 0 7px var(--hex-glow); }
.dpl.tw { animation: tw 3.4s ease-in-out infinite; }
@keyframes tw { 0%,100% { opacity: 1; } 50% { opacity: 0.45; } }

/* ============ THE GAP ============ */
.gap__cards {
  margin-top: clamp(2.5rem, 5vw, 3.5rem);
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.1rem;
}
.gcard {
  border: 1px solid var(--line); border-radius: 14px;
  padding: 1.6rem 1.5rem 1.7rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.018), transparent);
  transition: border-color 0.4s, transform 0.4s var(--ease), background 0.4s;
}
.gcard:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.gcard__no {
  font-family: var(--mono); font-size: 0.78rem; color: var(--hex);
  letter-spacing: 0.1em;
}
.gcard h3 { font-family: var(--serif); font-weight: 500; font-size: 1.32rem; margin: 0.9rem 0 0.6rem; letter-spacing: -0.01em; }
.gcard p { color: var(--muted); font-size: 0.98rem; }

/* ============ WHAT WE MEASURE ============ */
.section__head {
  display: grid; grid-template-columns: 1.4fr 0.9fr; gap: 2rem; align-items: end;
}
.section__note {
  font-family: var(--mono); font-size: 0.82rem; line-height: 1.7;
  color: var(--muted-2); max-width: 38ch;
  border-left: 1px solid var(--line-strong); padding-left: 1.1rem;
}

.assays { list-style: none; margin-top: clamp(2.5rem, 5vw, 3.5rem); }
.assay {
  display: grid; grid-template-columns: 4.5rem 1fr auto; align-items: center; gap: 1.5rem;
  padding: 1.7rem 1.4rem;
  border-top: 1px solid var(--line);
  position: relative;
  transition: background 0.4s, padding-left 0.4s var(--ease);
}
.assay:last-child { border-bottom: 1px solid var(--line); }
.assay:hover { background: linear-gradient(90deg, var(--fam-soft), transparent 55%); padding-left: 2rem; }
.assay__no {
  font-family: var(--mono); font-size: 1.05rem; color: var(--muted-2);
  transition: color 0.3s;
}
.assay:hover .assay__no { color: var(--fam); }
.assay__body h3 { font-family: var(--serif); font-weight: 500; font-size: clamp(1.25rem, 2.3vw, 1.7rem); letter-spacing: -0.015em; }
.assay__body p { color: var(--muted); margin-top: 0.35rem; max-width: 60ch; font-size: 0.99rem; }
.assay__body em { color: var(--text); font-style: italic; font-family: var(--serif); }
.assay__pulse {
  width: 9px; height: 9px; border-radius: 50%;
  background: rgba(120,150,175,0.18);
  transition: background 0.3s, box-shadow 0.3s; justify-self: end;
}
.assay:hover .assay__pulse { background: var(--fam); box-shadow: 0 0 12px var(--fam-glow); }

/* ============ WHY ============ */
.why__grid {
  margin-top: clamp(2.5rem, 5vw, 3.5rem);
  display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: 16px; overflow: hidden;
}
.why__item {
  background: var(--ink);
  padding: clamp(1.8rem, 3vw, 2.6rem);
  transition: background 0.4s;
}
.why__item:hover { background: var(--ink-2); }
.why__k {
  font-family: var(--mono); font-size: 0.8rem; letter-spacing: 0.06em;
  color: var(--fam); text-transform: uppercase;
  display: block; margin-bottom: 0.9rem;
}
.why__item p { color: var(--muted); font-size: 1.04rem; line-height: 1.6; }
.why__item strong { color: var(--text); font-weight: 600; }

/* ============ PILOT STEPS ============ */
.steps {
  margin-top: clamp(2.5rem, 5vw, 3.5rem);
  display: grid; grid-template-columns: 1fr auto 1fr auto 1fr; align-items: stretch; gap: 0;
}
.step {
  padding: 2rem 1.6rem;
  border: 1px solid var(--line); border-radius: 14px;
  background: linear-gradient(180deg, rgba(255,255,255,0.018), transparent);
  transition: border-color 0.4s, transform 0.4s var(--ease);
}
.step:hover { border-color: var(--line-strong); transform: translateY(-3px); }
.step__no {
  font-family: var(--mono); color: var(--fam); font-size: 0.85rem; letter-spacing: 0.1em;
}
.step h3 { font-family: var(--serif); font-weight: 500; font-size: 1.4rem; margin: 0.9rem 0 0.6rem; letter-spacing: -0.015em; }
.step p { color: var(--muted); font-size: 0.98rem; }
.step__link { align-self: center; width: 2.6rem; height: 1px; background: var(--line-strong); position: relative; }
.step__link::after {
  content: ""; position: absolute; right: -1px; top: 50%; transform: translateY(-50%);
  width: 5px; height: 5px; border-radius: 50%; background: var(--fam); box-shadow: 0 0 8px var(--fam-glow);
}

/* ============ CTA ============ */
.cta {
  position: relative; overflow: hidden; z-index: 2;
  padding: clamp(5.5rem, 12vw, 9rem) 0;
  border-top: 1px solid var(--line);
  text-align: center;
}
.cta__field {
  position: absolute; inset: 0; pointer-events: none;
  background:
    radial-gradient(640px 420px at 50% 120%, rgba(54,224,166,0.16), transparent 60%),
    radial-gradient(420px 300px at 18% -10%, rgba(246,181,63,0.07), transparent 60%);
}
.cta__inner { position: relative; }
.cta__title {
  font-family: var(--serif); font-weight: 500;
  font-size: clamp(2.4rem, 6vw, 4.4rem); line-height: 1.04; letter-spacing: -0.025em;
}
.cta__sub { max-width: 48ch; margin: 1.4rem auto 2.6rem; color: var(--muted); font-size: 1.12rem; }
.cta__email { margin-top: 1.6rem; font-family: var(--mono); font-size: 0.9rem; }
.cta__email a { color: var(--muted); border-bottom: 1px solid var(--line-strong); padding-bottom: 2px; transition: color 0.3s; }
.cta__email a:hover { color: var(--fam); }

/* ============ FOOTER ============ */
.footer { position: relative; z-index: 2; padding: clamp(3.5rem, 6vw, 5rem) 0 2.5rem; border-top: 1px solid var(--line); }
.footer__inner { display: flex; flex-wrap: wrap; gap: 2.5rem; justify-content: space-between; }
.brand--footer { color: var(--text); }
.footer__tag { color: var(--muted-2); margin-top: 0.9rem; font-size: 0.95rem; max-width: 30ch; }
.footer__cols { display: flex; gap: 4rem; }
.footer__h { display: block; font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.12em; text-transform: uppercase; color: var(--muted-2); margin-bottom: 0.7rem; }
.footer__col a, .footer__col span { color: var(--muted); font-size: 0.96rem; }
.footer__col a:hover { color: var(--fam); }
.footer__legal {
  display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between;
  margin-top: 3rem; padding-top: 1.6rem; border-top: 1px solid var(--line);
  font-family: var(--mono); font-size: 0.74rem; color: var(--muted-2); letter-spacing: 0.02em;
}

/* ============ REVEAL ANIMATIONS ============ */
.reveal, .reveal-up { opacity: 0; }
.reveal { transform: translateY(14px); }
.reveal-up { transform: translateY(26px); }
.reveal.in, .reveal-up.in {
  opacity: 1; transform: none;
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}
/* hero staggered load via data-d */
.reveal[data-d="0"].in { transition-delay: 0.05s; }
.reveal[data-d="1"].in { transition-delay: 0.16s; }
.reveal[data-d="2"].in { transition-delay: 0.28s; }
.reveal[data-d="3"].in { transition-delay: 0.42s; }
.reveal[data-d="4"].in { transition-delay: 0.56s; }
.reveal[data-d="5"].in { transition-delay: 0.7s; }
.reveal-up[data-stagger="1"].in { transition-delay: 0.1s; }
.reveal-up[data-stagger="2"].in { transition-delay: 0.2s; }
.reveal-up[data-stagger="3"].in { transition-delay: 0.3s; }
.reveal-up[data-stagger="4"].in { transition-delay: 0.4s; }

/* ============ RESPONSIVE ============ */
@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__visual { order: -1; max-width: 460px; }
  .section__head { grid-template-columns: 1fr; gap: 1.3rem; }
  .section__note { border-left: 0; padding-left: 0; border-top: 1px solid var(--line-strong); padding-top: 1rem; }
  .gap__cards { grid-template-columns: 1fr; }
  .why__grid { grid-template-columns: 1fr; }
  .steps { grid-template-columns: 1fr; gap: 1rem; }
  .step__link { display: none; }
  .nav__links { display: none; }
}
@media (max-width: 540px) {
  body { font-size: 16px; }
  .assay { grid-template-columns: 2.5rem 1fr; }
  .assay__pulse { display: none; }
  .assay:hover { padding-left: 1.4rem; }
  .footer__cols { gap: 2.5rem; }
}

/* ============ REDUCED MOTION ============ */
@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; scroll-behavior: auto !important; }
  .reveal, .reveal-up { opacity: 1 !important; transform: none !important; }
  .dpl { transform: scale(1) !important; transition: none !important; }
  .btn:hover, .gcard:hover, .step:hover { transform: none; }
}