/* =========================================================
     SIGMA STACKS — V1 "CLINICAL-LUXE"
     Lane: restrained, lab-precise, trust-forward.
     Layout system: editorial bento grid + generous whitespace.
     Motion language: slow, surgical reveals + animated purity data-viz.
     Tech: CSS scroll-driven (view()/scroll()) w/ IO fallback,
           anchor-positioned COA popovers, OKLCH, prefers-reduced-motion.
     ========================================================= */
  :root {
    --bg:       #0A0B0D;
    --bg-2:     #101216;
    --surface:  #15171B;
    --surface-2:#1B1E24;
    --line:     #23262D;
    --line-2:   #32363F;
    --ink:      #F5F7FA;
    --muted:    #9BA3AE;
    --faint:    #6E7683;
    --acid:     #C6FF3A;
    --acid-soft:rgba(198,255,58,0.10);
    --acid-ink: #0A0B0D;
    --blue:     #2E7CF6;
    --blue-soft:rgba(46,124,246,0.14);
    --amber:    #FFB020;
    --radius:   16px;
    --maxw:     1180px;
    --ease:     cubic-bezier(.16,1,.3,1);
  }
  * { box-sizing: border-box; margin: 0; padding: 0; }
  html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
  @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
  body {
    background:
      radial-gradient(1200px 600px at 80% -10%, var(--blue-soft), transparent 60%),
      radial-gradient(900px 500px at 0% 10%, var(--acid-soft), transparent 55%),
      var(--bg);
    color: var(--ink);
    font-family: "Inter", system-ui, sans-serif;
    line-height: 1.6; -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
  }
  .wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: 24px; }
  .display { font-family: "Anton", sans-serif; text-transform: uppercase; letter-spacing: .4px; line-height: .98; font-weight: 400; }
  .mono { font-family: "JetBrains Mono", monospace; }
  a { color: inherit; }
  img, svg { display: block; }

  /* hairline grid texture */
  body::before {
    content: ""; position: fixed; inset: 0; z-index: 0; pointer-events: none; opacity: .5;
    background-image:
      linear-gradient(var(--line) 1px, transparent 1px),
      linear-gradient(90deg, var(--line) 1px, transparent 1px);
    background-size: 64px 64px; mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 75%);
    -webkit-mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 75%);
  }
  main, header, footer { position: relative; z-index: 1; }

  /* ---------- Scroll progress (CSS scroll-timeline; JS fallback) ---------- */
  .progress { position: fixed; top: 0; left: 0; height: 2px; width: 100%; z-index: 99; transform-origin: 0 50%; transform: scaleX(0); background: linear-gradient(90deg, var(--blue), var(--acid)); }
  @supports (animation-timeline: scroll()) {
    .progress { animation: grow linear both; animation-timeline: scroll(root); }
  }
  @keyframes grow { to { transform: scaleX(1); } }

  /* ---------- Age / RUO gate ---------- */
  .gate { position: fixed; inset: 0; z-index: 200; display: grid; place-items: center; padding: 24px;
    background: oklch(10% 0.008 255 / 0.86); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); }
  .gate[hidden] { display: none; }
  .gate-card { max-width: 460px; background: var(--surface); border: 1px solid var(--line-2); border-radius: var(--radius); padding: 34px 30px; text-align: center; }
  .gate-card .sigil { font-family: "Anton"; font-size: 40px; color: var(--acid); line-height: 1; }
  .gate-card h2 { font-size: 20px; margin: 14px 0 8px; }
  .gate-card p { color: var(--muted); font-size: 14px; }
  .gate-card .ruo-line { margin-top: 16px; font-size: 12px; color: var(--faint); border: 1px dashed var(--line-2); border-radius: 10px; padding: 10px 12px; }
  .gate-actions { display: flex; gap: 10px; margin-top: 20px; }
  .gate-actions .btn { flex: 1; justify-content: center; }

  /* ---------- Header ---------- */
  header { position: sticky; top: 0; z-index: 50; container-type: scroll-state;
    display: flex; align-items: center; justify-content: space-between; gap: 16px;
    padding: 16px 24px; transition: background .4s, border-color .4s, padding .4s; border-bottom: 1px solid transparent; }
  header.stuck { background: oklch(13% 0.008 255 / 0.8); backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); border-color: var(--line); padding-block: 11px; }
  @supports (container-type: scroll-state) {
    @container scroll-state(stuck: top) {
      header { background: oklch(13% 0.008 255 / 0.8); border-color: var(--line); }
    }
  }
  .brand { display: flex; align-items: center; gap: 10px; font-family: "Archivo", sans-serif; font-weight: 500; font-size: 21px; letter-spacing: .3px; color: var(--acid); }
  .brand .mark { width: 26px; height: 26px; }
  .brand b { color: var(--ink); font-weight: 800; }
  nav.main { display: flex; align-items: center; gap: 26px; }
  nav.main a { color: var(--muted); text-decoration: none; font-size: 14px; font-weight: 500; transition: color .2s; }
  nav.main a:hover { color: var(--ink); }
  .header-cta { display: flex; align-items: center; gap: 12px; }
  .ss-acct { position: relative; display: inline-flex; align-items: center; justify-content: center; padding: 4px; color: var(--muted); transition: color .2s; }
  .ss-acct:hover { color: var(--acid); }
  /* logged-in state: brighter icon + lime presence dot */
  .ss-acct.in { color: var(--ink); }
  .ss-acct.in::after { content: ""; position: absolute; top: 1px; right: 1px; width: 7px; height: 7px; border-radius: 50%; background: var(--acid); box-shadow: 0 0 0 2px var(--bg); }
  /* Mobile: nav collapses, and the ghost CTA drops so brand + account + cart
     still fit 375px. Without this the header-cta overflowed ~35px once the
     account icon joined it, giving the whole page a horizontal scrollbar.
     Mirrors the same rule in sigma-chrome.css for inner pages. */
  @media (max-width: 860px) { nav.main { display: none; } .header-cta .btn.ghost { display: none; } }
  /* "SIGMA STACKS" broke onto two lines at 375px once the account icon
     joined the header row. */
  @media (max-width: 420px) { .brand { font-size: 18px; } .brand span { white-space: nowrap; } .brand .mark { width: 22px; height: 22px; } }

  /* ---------- Reveal (CSS scroll-driven w/ IO fallback) ---------- */
  .reveal { opacity: 0; transform: translateY(28px); }
  .reveal.in { opacity: 1; transform: none; transition: opacity .8s var(--ease), transform .8s var(--ease); }
  @supports (animation-timeline: view()) {
    @media (prefers-reduced-motion: no-preference) {
      .reveal:not(.in) { animation: revealIn linear both; animation-timeline: view(); animation-range: entry 5% cover 28%; }
    }
  }
  @keyframes revealIn { from { opacity: 0; transform: translateY(28px); } to { opacity: 1; transform: none; } }
  @media (prefers-reduced-motion: reduce) { .reveal { opacity: 1 !important; transform: none !important; } }

  /* ---------- Layout primitives ---------- */
  section { padding-block: clamp(64px, 9vw, 116px); }
  .eyebrow { display: inline-flex; align-items: center; gap: 8px; color: var(--acid); font-family: "JetBrains Mono"; font-size: 12px; font-weight: 500; letter-spacing: 2px; text-transform: uppercase; }
  .eyebrow::before { content: ""; width: 22px; height: 1px; background: var(--acid); }
  .sec-head { max-width: 640px; }
  .sec-head h2 { font-size: clamp(28px, 4.4vw, 50px); margin: 14px 0 12px; text-wrap: balance; }
  .sec-head p { color: var(--muted); font-size: 16px; text-wrap: pretty; }

  /* ---------- HERO ---------- */
  .hero { padding-top: clamp(48px, 8vw, 96px); padding-bottom: clamp(40px, 6vw, 80px); }
  .hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 48px; align-items: center; }
  @media (max-width: 940px) { .hero-grid { grid-template-columns: 1fr; gap: 36px; } }
  .hero h1 { font-size: clamp(40px, 6.4vw, 78px); text-wrap: balance; margin: 18px 0 20px; }
  .hero h1 .lime { color: var(--acid); }
  .hero .lede { color: var(--muted); font-size: clamp(16px, 1.6vw, 19px); max-width: 50ch; text-wrap: pretty; }
  .hero .cta-row { display: flex; gap: 12px; margin-top: 28px; flex-wrap: wrap; }
  .hero .reassure { margin-top: 18px; color: var(--faint); font-size: 13px; display: flex; gap: 16px; flex-wrap: wrap; }
  .hero .reassure span { display: inline-flex; align-items: center; gap: 6px; }
  .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--acid); }

  /* purity data-viz card */
  .puritycard { background: linear-gradient(180deg, var(--surface), var(--bg-2)); border: 1px solid var(--line-2); border-radius: 20px; padding: 24px; position: relative; overflow: hidden; }
  .puritycard .pc-top { display: flex; align-items: center; justify-content: space-between; }
  .puritycard .pc-top .label { font-family: "JetBrains Mono"; font-size: 11px; letter-spacing: 1.5px; color: var(--faint); text-transform: uppercase; }
  .puritycard .pc-top .lot { font-family: "JetBrains Mono"; font-size: 11px; color: var(--blue); }
  .puritycard .bignum { font-family: "Anton"; font-size: clamp(56px, 9vw, 84px); line-height: .9; margin: 12px 0 2px; }
  .puritycard .bignum small { font-size: .42em; color: var(--acid); vertical-align: super; }
  .puritycard .method { color: var(--muted); font-size: 13px; }
  .chromo { width: 100%; height: 120px; margin-top: 14px; }
  .chromo path.trace { fill: none; stroke: var(--acid); stroke-width: 2; stroke-linejoin: round;
    stroke-dasharray: 1400; stroke-dashoffset: 1400; }
  .chromo path.trace.draw { animation: draw 2.2s var(--ease) forwards; }
  @supports (animation-timeline: view()) {
    @media (prefers-reduced-motion: no-preference) {
      .chromo path.trace { animation: draw linear both; animation-timeline: view(); animation-range: entry 0% cover 40%; }
    }
  }
  @keyframes draw { to { stroke-dashoffset: 0; } }
  .chromo .axis { stroke: var(--line); stroke-width: 1; }
  .chromo text { font-family: "JetBrains Mono"; font-size: 8px; fill: var(--faint); }
  .pc-foot { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }

  /* ---------- Trust marquee strip ---------- */
  .trust-strip { border-block: 1px solid var(--acid); background: var(--acid); padding-block: 16px; overflow: hidden; }
  .trust-track { display: flex; gap: 44px; align-items: center; white-space: nowrap; width: max-content;
    animation: marquee 34s linear infinite; }
  @media (prefers-reduced-motion: reduce) { .trust-track { animation: none; flex-wrap: wrap; justify-content: center; width: auto; } }
  .trust-strip:hover .trust-track { animation-play-state: paused; }
  @keyframes marquee { to { transform: translateX(-50%); } }
  .trust-item { display: inline-flex; align-items: center; gap: 10px; color: #0A0B0D; font-size: 14px; font-weight: 600; }
  .trust-item b { color: #05070A; }
  .trust-item .ic { color: #0A0B0D; }

  /* data proof cell */
  .proofcell { background: linear-gradient(160deg, var(--surface-2), var(--surface)); }
  .proofcell .big { font-family: "Anton"; font-size: clamp(40px, 6vw, 60px); color: var(--acid); line-height: .9; }
  .proofcell .cap { color: var(--muted); font-size: 14px; margin-top: 6px; }
  .gauge { width: 100%; height: 8px; border-radius: 99px; background: var(--line); overflow: hidden; margin-top: 14px; }
  .gauge > i { display: block; height: 100%; width: 0; background: linear-gradient(90deg, var(--blue), var(--acid)); border-radius: 99px; transition: width 1.4s var(--ease); }
  .gauge.fill > i { width: var(--pct, 99%); }

  /* ---------- Shop by goal ---------- */
  .goals { display: grid; grid-template-columns: repeat(5, 1fr); gap: 12px; margin-top: 32px; }
  @media (max-width: 820px) { .goals { grid-template-columns: repeat(2, 1fr); } }
  .goal { border: 1px solid var(--line); border-radius: 14px; padding: 18px; background: var(--surface); cursor: pointer; transition: border-color .25s, background .25s; }
  .goal:hover { border-color: var(--acid); background: var(--surface-2); }
  .goal .ic { color: var(--acid); font-size: 20px; }
  .goal h4 { font-size: 15px; margin: 10px 0 2px; }
  .goal p { color: var(--faint); font-size: 12px; }

  /* ---------- Stacks (offer stacking) ---------- */
  .stacks-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; margin-top: 32px; }
  @media (max-width: 860px) { .stacks-grid { grid-template-columns: 1fr; } }
  .stack { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; position: relative; display: flex; flex-direction: column; }
  .stack.featured { border-color: var(--acid); background: linear-gradient(180deg, var(--acid-soft), var(--surface) 40%); }
  .stack .tag { position: absolute; top: -11px; left: 22px; background: var(--acid); color: var(--acid-ink); font-size: 11px; font-weight: 700; letter-spacing: .5px; padding: 4px 12px; border-radius: 999px; text-transform: uppercase; }
  .stack h3 { font-family: "Anton"; font-size: 26px; letter-spacing: .5px; margin-bottom: 4px; }
  .stack .desc { color: var(--faint); font-size: 13px; }
  .stack ul { list-style: none; margin: 16px 0; }
  .stack li { display: flex; justify-content: space-between; color: var(--muted); font-size: 13.5px; padding: 8px 0; border-bottom: 1px solid var(--line); }
  .stack li .v { font-family: "JetBrains Mono"; color: var(--faint); }
  .value-math { margin-top: auto; }
  .value-math .line { display: flex; justify-content: space-between; font-size: 13px; color: var(--muted); padding: 3px 0; }
  .value-math .line.tot { color: var(--ink); font-weight: 600; border-top: 1px solid var(--line-2); margin-top: 6px; padding-top: 10px; }
  .value-math .old { text-decoration: line-through; color: var(--faint); font-family: "JetBrains Mono"; }
  .value-math .now { font-family: "Anton"; font-size: 30px; color: var(--acid); }
  .value-math .save { color: var(--acid); font-family: "JetBrains Mono"; font-size: 12px; }
  .stack .btn { margin-top: 16px; width: 100%; justify-content: center; }

  /* ---------- Why us split ---------- */
  /* ---------- Why Sigma Stacks — feature cards w/ drawn visuals ---------- */
  /* Flex, not grid: with five cards an incomplete row centres itself at every
     width instead of leaving a hole on the right. */
  .whyfeat { display: flex; flex-wrap: wrap; justify-content: center; gap: 16px; margin-top: 34px; }
  .whyfeat > .wf { flex: 1 1 196px; max-width: 226px; }
  @media (max-width: 560px) { .whyfeat > .wf { flex-basis: 100%; max-width: none; } }

  .wf { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
    padding: 26px 22px 26px; text-align: center; display: flex; flex-direction: column; align-items: center;
    transition: border-color .3s, transform .3s var(--ease), box-shadow .3s; }
  .wf:hover { border-color: var(--acid); transform: translateY(-4px); box-shadow: 0 18px 44px -26px var(--acid); }
  .wf h3 { font-family: "Archivo", sans-serif; font-weight: 700; font-size: 17px; letter-spacing: -.01em; margin-bottom: 7px; }
  .wf p { color: var(--muted); font-size: 13.5px; line-height: 1.55; max-width: 30ch; }
  .wf-cta { margin-top: 12px; font-family: "JetBrains Mono", monospace; font-size: 12px; color: var(--acid); text-decoration: none; }
  .wf-cta:hover { text-decoration: underline; text-underline-offset: 3px; }

  .wf-art { width: 100%; max-width: 168px; margin-bottom: 16px; }
  .wf-art svg { width: 100%; height: auto; display: block; overflow: visible; }
  /* shared drawing language: hairline strokes, no fills unless stated */
  .wf-art .wf-stroke, .wf-art .wf-link { fill: none; stroke: var(--ink); stroke-width: 3; stroke-linejoin: round; stroke-linecap: round; }
  .wf-art .wf-link { stroke: var(--line-2); stroke-width: 2; }

  /* 1 — shipping */
  .wf-speed line { opacity: .9; }
  .wf-shield path { fill: var(--acid-soft); stroke: var(--acid); stroke-width: 3; stroke-linejoin: round; stroke-linecap: round; }
  .wf-shield .wf-check { fill: none; stroke: var(--acid); }

  /* 2 — community */
  .wf-node circle { fill: var(--surface-2); stroke: var(--line-2); stroke-width: 2.5; }
  .wf-hub { fill: var(--acid-soft); stroke: var(--acid); stroke-width: 3; }
  .wf-plane { fill: var(--acid); }
  .wf-planeline { stroke: var(--acid-ink); stroke-width: 2; fill: none; }

  /* 3 — purity dial */
  .wf-track { fill: none; stroke: var(--line); stroke-width: 9; }
  .wf-ring { fill: none; stroke: var(--acid); stroke-width: 9; stroke-linecap: round;
    /* r=32 → circumference ≈ 201.06; 99% ≈ 199 */
    stroke-dasharray: 201.06; stroke-dashoffset: 201.06;
    transform: rotate(-90deg); transform-origin: 64px 48px; }
  .wf-pct { font-family: "Anton", sans-serif; font-size: 21px; fill: var(--ink); letter-spacing: .5px; }

  /* 4 — support */
  .wf-dots circle { fill: var(--faint); }
  .wf-bubble2 { fill: var(--acid-soft); stroke: var(--acid); stroke-width: 3; stroke-linejoin: round; }
  .wf-live { fill: var(--acid); }

  /* 5 — 30-day guarantee seal */
  .wf-stitch { fill: none; stroke: var(--acid); stroke-width: 2.5; stroke-dasharray: 5 7; stroke-linecap: round; transform-origin: 64px 44px; }
  .wf-seal { fill: var(--acid-soft); stroke: var(--acid); stroke-width: 3; }
  .wf-ribbon path { fill: var(--acid-soft); stroke: var(--acid); stroke-width: 2.5; stroke-linejoin: round; }
  .wf-30 { font-family: "Anton", sans-serif; font-size: 22px; fill: var(--ink); }
  .wf-day { font-family: "JetBrains Mono", monospace; font-size: 8.5px; font-weight: 700; letter-spacing: 2px; fill: var(--acid); }

  @media (prefers-reduced-motion: no-preference) {
    .wf-speed line { animation: wfSpeed 1.5s var(--ease) infinite; }
    .wf-speed line:nth-child(2) { animation-delay: .18s; }
    .wf-speed line:nth-child(3) { animation-delay: .36s; }
    @keyframes wfSpeed { 0% { opacity: 0; transform: translateX(-8px); } 35% { opacity: .95; } 100% { opacity: 0; transform: translateX(10px); } }

    .wf-node circle { animation: wfNode 2.6s ease-in-out infinite; }
    .wf-node circle:nth-child(2) { animation-delay: .3s; } .wf-node circle:nth-child(3) { animation-delay: .6s; }
    .wf-node circle:nth-child(4) { animation-delay: .9s; } .wf-node circle:nth-child(5) { animation-delay: 1.2s; }
    .wf-node circle:nth-child(6) { animation-delay: 1.5s; }
    @keyframes wfNode { 0%,100% { stroke: var(--line-2); } 50% { stroke: var(--acid); } }

    /* dial draws once when the card reveals into view */
    .wf .wf-ring { animation: wfRing 1.7s var(--ease) .25s both; }
    @keyframes wfRing { to { stroke-dashoffset: 2; } }

    .wf-dots circle { animation: wfDot 1.4s ease-in-out infinite; }
    .wf-dots circle:nth-child(2) { animation-delay: .18s; }
    .wf-dots circle:nth-child(3) { animation-delay: .36s; }
    @keyframes wfDot { 0%,100% { fill: var(--faint); } 50% { fill: var(--acid); } }

    .wf-live { animation: wfLive 2s ease-in-out infinite; }
    @keyframes wfLive { 0%,100% { opacity: 1; } 50% { opacity: .35; } }

    .wf-stitch { animation: wfSpin 22s linear infinite; }
    @keyframes wfSpin { to { transform: rotate(360deg); } }
  }
  /* reduced motion: dial still needs to show its value, just without the draw */
  @media (prefers-reduced-motion: reduce) { .wf-ring { stroke-dashoffset: 2; } }

  /* ---------- Guarantee / risk reversal ---------- */
  .guarantee { background: linear-gradient(135deg, var(--surface-2), var(--surface)); border: 1px solid var(--line-2); border-radius: 22px; padding: 40px; display: grid; grid-template-columns: auto 1fr auto; gap: 28px; align-items: center; }
  @media (max-width: 820px) { .guarantee { grid-template-columns: 1fr; text-align: center; } }
  .seal { width: 96px; height: 96px; border-radius: 50%; border: 2px solid var(--acid); display: grid; place-items: center; font-family: "Anton"; color: var(--acid); font-size: 13px; text-align: center; line-height: 1; }
  .guarantee h3 { font-family: "Anton"; font-size: 28px; letter-spacing: .5px; }
  .guarantee p { color: var(--muted); font-size: 15px; margin-top: 6px; max-width: 60ch; }

  /* ---------- Email capture ---------- */
  .capture { background: var(--surface); border: 1px solid var(--line); border-radius: 20px; padding: 34px; text-align: center; }
  .capture h3 { font-family: "Anton"; font-size: clamp(26px, 4vw, 40px); }
  .capture p { color: var(--muted); margin: 8px auto 20px; max-width: 48ch; }
  .capture form { display: flex; gap: 10px; max-width: 460px; margin-inline: auto; }
  .capture input { flex: 1; background: var(--bg-2); border: 1px solid var(--line-2); color: var(--ink); border-radius: 10px; padding: 13px 16px; font-size: 15px; font-family: inherit; }
  .capture input:focus { outline: 2px solid var(--acid); outline-offset: 1px; }
  @media (max-width: 520px) { .capture form { flex-direction: column; } }

  /* ---------- Footer ---------- */
  footer { border-top: 1px solid var(--line); padding-block: 44px; }
  .foot-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 28px; }
  @media (max-width: 760px) { .foot-grid { grid-template-columns: 1fr 1fr; } }
  footer h5 { font-family: "JetBrains Mono"; font-size: 11px; letter-spacing: 1.5px; text-transform: uppercase; color: var(--faint); margin-bottom: 12px; }
  footer a { color: var(--muted); text-decoration: none; font-size: 14px; display: block; padding: 4px 0; }
  footer a:hover { color: var(--ink); }
  .ruo-block { margin-top: 32px; background: var(--acid-soft); border: 1px solid var(--line-2); border-radius: 12px; padding: 16px 18px; font-size: 12.5px; color: var(--muted); }
  .ruo-block b { color: var(--acid); }
  .copy { margin-top: 20px; color: var(--faint); font-size: 12.5px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; }

  .badge-21 { font-family: "JetBrains Mono"; font-size: 11px; border: 1px solid var(--amber); color: var(--amber); border-radius: 6px; padding: 2px 7px; }

  /* ================= ACID-LIME NEON FX (3D + glow layer) ================= */
  /* neon scanlines over the whole canvas — lab-monitor energy */
  body::after { content:""; position:fixed; inset:0; z-index:0; pointer-events:none; opacity:.55;
    background: repeating-linear-gradient(0deg, rgba(255,255,255,.02) 0 1px, transparent 1px 3px); }

  /* OPTION A — peptide particle helix backdrop across the hero */
  .hero-helix { position:absolute; inset:0; z-index:1; pointer-events:none; opacity:.42;
    -webkit-mask-image:linear-gradient(90deg, transparent 0%, rgba(0,0,0,.35) 22%, #000 55%, #000 88%, transparent 100%);
    mask-image:linear-gradient(90deg, transparent 0%, rgba(0,0,0,.35) 22%, #000 55%, #000 88%, transparent 100%); }
  .hero-helix canvas { width:100%; height:100%; display:block; }
  .hero-grid { position:relative; z-index:2; }

  /* drifting glow orbs */
  .orb { position:absolute; border-radius:50%; filter:blur(46px); pointer-events:none; z-index:0; }
  .orb.a { width:300px; height:300px; background:rgba(198,255,58,.14); top:-50px; right:4%;  animation:drift 11s ease-in-out infinite alternate; }
  .orb.b { width:240px; height:240px; background:rgba(46,124,246,.12); bottom:-40px; left:-50px; animation:drift 14s ease-in-out infinite alternate-reverse; }
  @keyframes drift { from { transform:translate3d(0,0,0) scale(1); } to { transform:translate3d(28px,20px,0) scale(1.14); } }

  /* 3D stage: hero + bento respond to the pointer */
  .hero { position:relative; }
  .hero-grid { perspective:1200px; }
  .pc-wrap { position:relative; transform-style:preserve-3d; }
  .puritycard { transform-style:preserve-3d; will-change:transform;
    box-shadow:0 30px 80px -30px rgba(198,255,58,.28), 0 0 0 1px rgba(198,255,58,.08); }
  .puritycard .sheen { position:absolute; inset:0; border-radius:20px; pointer-events:none;
    background:linear-gradient(115deg, transparent 32%, rgba(255,255,255,.10) 46%, transparent 60%);
    background-size:250% 100%; animation:sheen 6s var(--ease) infinite; }
  @keyframes sheen { 0%,55% { background-position:130% 0; } 88%,100% { background-position:-40% 0; } }

  /* product cards: 3D tilt + lime edge glow */
  .bento { perspective:1400px; }
  .cell.prod { transform-style:preserve-3d; }
  .cell.prod:hover { border-color:rgba(198,255,58,.5); box-shadow:0 24px 60px -28px rgba(198,255,58,.35); }
  /* shift the blue vial photo toward lime so the placeholder sits in-theme */
  /* Scoped to the placeholder only. This rotation exists to shift the BLUE
     placeholder render toward lime; the real product photography is already
     lime, so applying it there swings the vials to magenta. */
  .vbvial:not(.has-photo) img { filter:hue-rotate(225deg) saturate(1.12) brightness(.96); }
  .vbvial { box-shadow:inset 0 0 26px rgba(198,255,58,.10); }

  /* neon instrument trace */
  .chromo path.trace { filter:drop-shadow(0 0 6px rgba(198,255,58,.55)); }

  /* CTAs get a charged hover */
  .btn:hover { box-shadow:0 10px 36px -8px rgba(198,255,58,.6); }

  @media (prefers-reduced-motion: reduce) {
    .orb, .puritycard .sheen { animation:none; }
  }