/* =========================================================
   Arencibia — Marketing Page
   1. Design tokens
   2. Reset & base
   3. Typography
   4. Layout helpers
   5. Buttons
   6. Header / nav
   7. Hero
   8. Proof
   9. How It Works
   10. Footer
   11. Responsive
   ========================================================= */

/* ---------- 1. Design tokens ---------- */
:root {
  /* Brand palette */
  --cyan: #0649d4;          /* primary blue (accents, gradients) */
  --cyan-strong: #0649d4;   /* AA-safe blue for text/links/buttons on light */
  --cyan-deep: #0e3890;     /* button hover */
  --violet: #8b5cf6;        /* secondary */
  --pink: #ec4899;          /* accent */
  --orange: #f97316;        /* helium gradient partner */

  /* Neutrals */
  --bg: #fafafa;            /* neutral 50 */
  --surface: #ffffff;
  --ink: #000000;           /* headings */
  --text: #262626;          /* neutral 800 body */
  --muted: #525252;         /* neutral 600 secondary text */
  --faint: #737373;         /* neutral 500 */
  --border: #e5e5e5;        /* neutral 200 */
  --border-soft: #f0f0f0;
  --dark: #0b1020;          /* dark anchor sections */

  /* Gradients */
  --gradient-brand-2: linear-gradient(100deg, #4ade80 0%, #2563eb 100%);  /* brand gradient (green → blue) */
  --gradient-argon: linear-gradient(135deg, #6366f1 0%, #d946ef 100%);
  --gradient-helium: linear-gradient(135deg, #ec4899 0%, #f97316 100%);

  /* Elevation (soft, coherent) */
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, .06);
  --shadow-md: 0 6px 20px -6px rgba(15, 23, 42, .12);
  --shadow-lg: 0 24px 60px -18px rgba(15, 23, 42, .18);

  /* Metrics */
  --radius: 16px;
  --radius-sm: 10px;
  --radius-pill: 100px;
  --container: 1180px;
  --header-h: 72px;
  --section-pad: clamp(4rem, 8vw, 7rem);
  --ease: cubic-bezier(.4, 0, .2, 1);
}

/* ---------- 2. Reset & base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-h) + 16px); -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  position: relative;
  z-index: 0;
}

/* ---------- 2b. Ambient background flourish ----------
   Two fixed, non-interactive layers behind all content:
   (a) faint brand-color radial glows anchored to the viewport edges
   (b) a whisper-light neutral dot grid for engineered texture
   Dark sections and white cards set their own backgrounds, so this
   only shows through the neutral page areas. Kept intentionally subtle. */
body::before,
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
}
/* (a) Brand-color glows: primary blue from top-left, secondary green from lower-right */
body::before {
  background:
    radial-gradient(60rem 45rem at 8% -6%, rgba(37, 99, 235, .22), transparent 60%),
    radial-gradient(52rem 42rem at 104% 108%, rgba(74, 222, 128, .20), transparent 58%);
}
/* (b) Neutral dot grid: ~3% ink, 22px pitch, 1px dots */
body::after {
  background-image: radial-gradient(rgba(15, 23, 42, .1) 1px, transparent 1.4px);
  background-size: 22px 22px;
  background-position: -1px -1px;
}
@media (prefers-reduced-motion: no-preference) {
  /* static by design — no motion; declared for clarity/future use */
}
img, svg { display: block; max-width: 100%; }
a { color: var(--cyan-strong); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { margin: 0; padding: 0; list-style: none; }
:focus-visible { outline: 3px solid var(--cyan); outline-offset: 2px; border-radius: 4px; }

/* ---------- 3. Typography ---------- */
h1, h2, h3, h4 {
  font-family: "Inter Tight", "Inter", system-ui, sans-serif;
  color: var(--ink);
  margin: 0 0 .5em;
  letter-spacing: -0.02em;
}
h1 { font-weight: 800; font-size: clamp(2rem, 4.5vw, 2.25rem); line-height: 1.1; }
h2 { font-weight: 800; font-size: clamp(2rem, 4.5vw, 2.25rem); line-height: 1.1; }
h3 { font-weight: 600; font-size: 1.5rem; line-height: 1.22; }
h4 { font-weight: 600; font-size: 1.25rem; line-height: 1.3; }
p  { margin: 0 0 1rem; letter-spacing: -0.02em; }
.text-gradient {
  background: var(--gradient-brand-2);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.eyebrow {
  display: inline-block;
  font-family: "Inter Tight", sans-serif;
  font-weight: 600;
  font-size: .875rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--cyan-strong);
  margin-bottom: .75rem;
}

/* ---------- 4. Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 1.5rem;
}
section { scroll-margin-top: var(--header-h); }

/* ---------- 5. Buttons ---------- */
.btn {
  --btn-bg: var(--cyan-strong);
  --btn-fg: #fff;
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: "Inter Tight", sans-serif;
  font-weight: 600;
  font-size: .95rem;
  line-height: 1;
  padding: .8rem 1.4rem;
  border-radius: var(--radius-pill);
  border: 1.5px solid transparent;
  background: var(--btn-bg);
  color: var(--btn-fg);
  cursor: pointer;
  transition: background .18s var(--ease), color .18s var(--ease), border-color .18s var(--ease), transform .18s var(--ease), box-shadow .18s var(--ease);
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn i { font-size: 1.05em; }
.btn--primary { --btn-bg: var(--cyan-strong); box-shadow: var(--shadow-sm); }
.btn--primary:hover { --btn-bg: var(--cyan-deep); transform: translateY(-1px); box-shadow: var(--shadow-md); }
/* Hero "Contact Us" CTA — brand gradient fill (scoped to the hero so the
   Contact-page submit button keeps its solid cyan). */
.hero__actions .btn--primary {
  --btn-bg: transparent;                 /* no solid layer to peek past the gradient */
  background-image: var(--gradient-brand-2);
  border: 0;                             /* removes the 1.5px transparent border sliver */
  padding: calc(.95rem + 1.5px) calc(1.7rem + 1.5px);  /* keep size identical to btn--lg */
  box-shadow: var(--shadow-md);
}
.hero__actions .btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
  filter: saturate(1.08) brightness(1.05);
}
.btn--ghost {
  --btn-bg: white;
  --btn-fg: var(--ink);
  border-color: var(--border);
}
.btn--ghost:hover { border-color: var(--cyan-strong); color: var(--cyan-strong); background: rgba(6,73,212,.05); }
.btn--lg { padding: .95rem 1.7rem; font-size: 1rem; }

/* ---------- 6. Header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250, 250, 250, .8);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease), background .2s var(--ease);
}
.site-header.is-scrolled {
  background: rgba(255, 255, 255, .9);
  border-bottom-color: var(--border);
}
.header__inner {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: var(--header-h);
}
.header__logo { display: flex; align-items: center; }
.header__logo img { height: 28px; width: auto; }
.header__nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  margin-left: auto;
}
.header__nav a {
  font-family: "Inter Tight", sans-serif;
  font-weight: 500;
  font-size: .95rem;
  color: var(--text);
  transition: color .15s var(--ease);
}
.header__nav a:hover { color: var(--cyan-strong); text-decoration: none; }
.header__cta { margin-left: .25rem; }
.header__toggle {
  display: none;
  margin-left: auto;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 44px; height: 44px;
  font-size: 1.4rem;
  color: var(--ink);
  cursor: pointer;
  align-items: center;
  justify-content: center;
}

/* ---------- 7. Hero ---------- */
.hero {
  padding: clamp(3.5rem, 8vw, 6rem) 0 var(--section-pad);
}
.hero__inner {
  max-width: 1080px;
  margin-inline: auto;
  text-align: center;
}
.hero__title {
  margin: 0 auto 1.5rem;
  line-height: 1.05;
  letter-spacing: -0.02em;
}
/* Line 1 — big brand-gradient statement */
.hero__title-1 {
  display: block;
  font-size: clamp(2.5rem, 7.2vw, 4.5rem);   /* up to 72px */
  font-weight: 800;
  background: var(--gradient-brand-2);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  padding-bottom: 0.06em;                     /* keeps descenders/clip from cropping */
}
/* Line 2 — supporting, ink (capped so it stays on one line in the 1080 container) */
.hero__title-2 {
  display: block;
  font-size: clamp(1.85rem, 5vw, 3rem);       /* up to 48px */
  font-weight: 800;
  color: var(--ink);
  text-wrap: balance;
}
.hero__lead {
  font-family: "Inter Tight", sans-serif;
  font-size: 1.2rem;
  line-height: 1.6;
  color: var(--muted);
  max-width: 60ch;
  margin: 0 auto 2rem;
  text-wrap: balance;
}
.hero__actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: .85rem;
  margin-bottom: clamp(2.75rem, 5vw, 3.75rem);
}

/* Hero supporting cards (hero points 2–4) */
.hero__cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  text-align: left;
}
.hero-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
}
.hero-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 75px;
  height: 75px;
  border-radius: 18px;
  background: rgba(6, 73, 212,.1);
  color: var(--cyan-strong);
  font-size: 2rem;
  margin-bottom: 1rem;
}
.hero-card__title {
  font-family: "Inter Tight", sans-serif;
  font-weight: 600;
  font-size: 1.1875rem;
  line-height: 1.25;
  color: var(--ink);
  margin: 0 0 .5rem;
}
.hero-card p {
  margin: 0;
  font-size: 1rem;
  line-height: 1.55;
  color: var(--text);
}

/* ---------- 8. Proof ---------- */
.proof {
  padding: var(--section-pad) 0;
}
.proof__head {
  margin-bottom: clamp(2.5rem, 5vw, 3.5rem);
}
.proof__title { max-width: 70ch; margin: 0 0 1rem; }
.proof__intro {
  max-width: 60ch;
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--muted);
  margin: 0 0 1.5rem;
}
.proof__expertise {
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  margin: 0;
  font-family: "Inter Tight", sans-serif;
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--ink);
}
.proof__expertise i { color: var(--cyan-strong); font-size: 1.35em; }

/* Stats band — one grid panel, hairline dividers, brand top accent */
.stats {
  position: relative;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  margin-bottom: clamp(2.5rem, 5vw, 3.5rem);
}
.stats::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--gradient-brand-2);
  z-index: 2;
}
.stat {
  background: var(--surface);
  padding: clamp(1.5rem, 3vw, 2.1rem);
}
.stat__num {
  display: block;
  font-family: "Inter Tight", sans-serif;
  font-weight: 800;
  font-size: clamp(2.25rem, 3.5vw, 3rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: .65rem;
}
.stat__label {
  display: block;
  font-size: .9375rem;
  line-height: 1.45;
  color: var(--muted);
}

/* Tag groups */
.proof__tags {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(1.75rem, 4vw, 3rem);
}
.tag-group__label {
  font-family: "Inter Tight", sans-serif;
  font-weight: 600;
  font-size: .8125rem;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 0 0 1rem;
}
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: .6rem;
}
.tag {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  font-size: .9375rem;
  font-weight: 500;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-pill);
  padding: .5rem 1rem;
  line-height: 1.2;
}
.tag i {
  color: var(--cyan-strong);
  font-size: 1.1em;
}

/* ---------- 9. How It Works ---------- */
.how { padding: var(--section-pad) 0; }
.how__grid {
  display: grid;
  grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: start;
}
.how__title { margin: 0 0 1.25rem; }
.how__lead {
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--muted);
  margin: 0 0 1rem;
}
.how__text {
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--muted);
  margin: 0;
}
.how__lifecycle-label {
  font-family: "Inter Tight", sans-serif;
  font-weight: 600;
  font-size: .8125rem;
  letter-spacing: .07em;
  text-transform: uppercase;
  color: var(--faint);
  margin: 0 0 1.75rem;
}

/* Vertical lifecycle stepper */
.steps { position: relative; }
.step {
  position: relative;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 1.1rem;
  padding-bottom: 2rem;
}
.step:last-child { padding-bottom: 0; }
.step::before {
  content: "";
  position: absolute;
  left: 21px;
  top: 46px;
  bottom: 0;
  width: 2px;
  background: var(--border);
}
.step:last-child::before { display: none; }
/* Each step samples the brand gradient (green → blue) at its own
   position along the 6-step run: i/(n-1) for i = 0..5. With an even node
   count there's no literal "middle" node, so instead of coloring one node
   the midpoint, every node wears the exact color the gradient has at its
   spot — first = start color, last = end color, the rest interpolated.
   --node is set on .step so both the node circle and the ordinal label
   below it share one color. */
.step { --node: #4ade80; }               /* default; overridden per step below */
.step:nth-child(1) { --node: #4ade80; }  /* pos 0.0  — green (start) */
.step:nth-child(2) { --node: #43c695; }  /* pos 0.2  — green-teal */
.step:nth-child(3) { --node: #3baeab; }  /* pos 0.4  — teal */
.step:nth-child(4) { --node: #3495c0; }  /* pos 0.6  — cyan-blue */
.step:nth-child(5) { --node: #2c7dd6; }  /* pos 0.8  — blue */
.step:nth-child(6) { --node: #2563eb; }  /* pos 1.0  — blue (end) */
.step__node {
  position: relative;
  z-index: 1;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: color-mix(in srgb, var(--node) 14%, transparent);
  border: 1px solid color-mix(in srgb, var(--node) 40%, transparent);
  color: var(--node);
  font-size: 1.25rem;
}
.step__ord {
  display: block;
  font-family: "Inter Tight", sans-serif;
  font-weight: 600;
  font-size: .75rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--node);
}
.step__title { margin: .15rem 0 .35rem; font-size: 1.1875rem; }
.step__desc { margin: 0; color: var(--muted); font-size: 1rem; line-height: 1.55; }

/* Emphasis paragraph under how__text — matches how__text, but bold */
.how__emphasis {
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--muted);
  font-weight: 700;
  margin: 1.5rem 0 0;
}

/* ---------- 10. Monitoring (dark anchor) ---------- */
.monitoring {
  background: var(--dark);
  color: #cbd5e1;
  padding: var(--section-pad) 0;
}
.monitoring__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: center;
}
.eyebrow--on-dark { color: #5b8def; }
.monitoring__title {
  color: #ffffff;
  margin: 0 0 1.5rem;
  max-width: 22ch;
}
.monitoring__text {
  font-size: 1.0625rem;
  line-height: 1.65;
  color: #cbd5e1;
  margin: 0 0 1rem;
}
.monitoring__text:last-child { margin-bottom: 0; }
.monitoring__text--mars {
  margin-top: 1.5rem;
  padding-left: 1.1rem;
  border-left: 2px solid rgba(91, 141, 239,.55);
  color: #e2e8f0;
}

/* MARS — Monitoring, Analytics, and Response System */
.mars {
  background: rgba(255, 255, 255, .04);
  border: 1px solid rgba(255, 255, 255, .09);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 3vw, 2rem);
}
.mars__head {
  padding-bottom: 1.25rem;
}
.mars__badge {
  display: block;
  font-family: "Inter Tight", sans-serif;
  font-weight: 800;
  font-size: 1.125rem;
  letter-spacing: .14em;
  margin-bottom: .4rem;
  background: var(--gradient-brand-2);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.mars__expand {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.35;
  color: #94a3b8;
}
.mars__pillars {
  display: flex;
  flex-direction: column;
  gap: .75rem;
}
.mars-pillar {
  display: flex;
  align-items: flex-start;
  gap: .9rem;
  background: rgba(255, 255, 255, .03);
  border: 1px solid rgba(255, 255, 255, .07);
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
}
.mars-pillar__text {
  display: flex;
  flex-direction: column;
  gap: .3rem;
}
.mars-pillar__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  flex: none;
  border-radius: 10px;
  background: rgba(91, 141, 239,.12);
  color: #5b8def;
  font-size: 1.3rem;
}
.mars-pillar__name {
  font-family: "Inter Tight", sans-serif;
  font-weight: 600;
  font-size: 1.0625rem;
  color: #f1f5f9;
}
.mars-pillar__blurb {
  margin: 0;
  font-size: .85rem;
  line-height: 1.5;
  color: #a8b3c4;
}

/* ---------- 11. Performance ---------- */
.performance { padding: var(--section-pad) 0; }
.performance__head {
  max-width: 62ch;
  margin: 0 0 clamp(2.5rem, 5vw, 3.5rem);
}
.performance__title { margin: 0 0 1.25rem; }
.performance__text {
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--muted);
  margin: 0 0 1rem;
}
.performance__text:last-child { margin-bottom: 0; }

/* Advertised vs financially backed comparison strip */
.compare {
  display: flex;
  align-items: stretch;
  gap: 1rem;
  margin-bottom: clamp(2rem, 4vw, 2.75rem);
}
.compare__side {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: .4rem;
  padding: clamp(1.5rem, 3vw, 2rem);
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
}
.compare__side--advertised {
  border-style: dashed;
}
.compare__side--delivers {
  box-shadow: var(--shadow-sm);
}
.compare__side--backed {
  position: relative;
  border-color: transparent;
  box-shadow: var(--shadow-md);
  overflow: hidden;
}
.compare__side--backed::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--gradient-brand-2);
}
.compare__label {
  font-family: "Inter Tight", sans-serif;
  font-weight: 600;
  font-size: .8125rem;
  letter-spacing: .07em;
  text-transform: uppercase;
}
.compare__side--advertised .compare__label { color: var(--faint); }
.compare__side--delivers .compare__label { color: var(--muted); }
.compare__side--backed .compare__label { color: var(--cyan-strong); }
.compare__figure {
  font-family: "Inter Tight", sans-serif;
  font-weight: 800;
  font-size: clamp(2rem, 4vw, 2.75rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.compare__side--advertised .compare__figure { color: var(--faint); }
.compare__side--delivers .compare__figure { color: var(--ink); }
.compare__side--backed .compare__figure { color: var(--ink); }
.compare__note {
  font-size: .9375rem;
  line-height: 1.4;
  color: var(--muted);
}
.compare__side--advertised .compare__note { color: var(--faint); }
.performance__closing {
  font-family: "Inter Tight", sans-serif;
  font-weight: 700;
  font-size: clamp(1.25rem, 2.5vw, 1.6rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 28ch;
  margin: 0;
}

/* ---------- 12. Gases ---------- */
.gases { padding: var(--section-pad) 0; }
.gases__head {
  max-width: 62ch;
  margin: 0 0 clamp(2.5rem, 5vw, 3.5rem);
}
.gases__title { margin: 0 0 1rem; }
.gases__intro {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--muted);
  margin: 0;
}

/* Argon + Helium feature cards */
.gas-features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: clamp(1.25rem, 3vw, 1.75rem);
  margin-bottom: clamp(1.25rem, 3vw, 1.75rem);
}
.gas-card {
  position: relative;
  overflow: hidden;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1.75rem, 3vw, 2.25rem);
  box-shadow: var(--shadow-md);
}
.gas-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
}
.gas-card--argon::before { background: var(--gradient-argon); }
.gas-card--helium::before { background: var(--gradient-helium); }
.gas-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 112px;
  height: 112px;
  border-radius: 24px;
  color: #fff;
  font-family: "Inter Tight", "Inter", system-ui, sans-serif;
  font-weight: 800;
  font-size: 3rem;
  line-height: 1;
  letter-spacing: -0.01em;
  margin-bottom: 1.25rem;
}
.gas-card--argon .gas-card__icon { background: var(--gradient-argon); }
.gas-card--helium .gas-card__icon { background: var(--gradient-helium); }
.gas-card__title { margin: 0 0 .5rem; font-size: 1.375rem; }
.gas-card__text {
  margin: 0;
  color: var(--muted);
  font-size: 1.0625rem;
  line-height: 1.6;
}

/* Other gas recovery — flatter, exploratory band */
.gas-other {
  display: grid;
  grid-template-columns: minmax(0, .82fr) minmax(0, 2fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1.75rem, 3.5vw, 2.5rem);
}
.gas-other__head {
  display: flex;
  flex-direction: column;
  gap: .9rem;
}
.gas-other__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(6, 73, 212,.1);
  color: var(--cyan-strong);
  font-size: 1.5rem;
}
.gas-other__title { margin: 0; font-size: 1.375rem; }
.gas-other__body p {
  margin: 0 0 1rem;
  color: var(--muted);
  font-size: 1.0625rem;
  line-height: 1.65;
}
.gas-other__body p:last-child { margin-bottom: 0; }

/* ---------- 13. Industries ---------- */
.industries { padding: var(--section-pad) 0; }
.industries__head {
  max-width: 62ch;
  margin: 0 0 clamp(2.5rem, 5vw, 3.5rem);
}
.industries__title { margin: 0 0 1rem; }
.industries__intro {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--muted);
  margin: 0;
}
.industry-row {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: clamp(1.5rem, 1.0vw, 2.25rem);
}
.industry {
  margin: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: clamp(1.5rem, 2.5vw, 1rem);
  box-shadow: var(--shadow-sm);
}
.industry__icon {
  display: inline-flex;
  color: var(--cyan-strong);
  font-size: 1.85rem;
  margin-bottom: .85rem;
}
.industry__name {
  font-size: 1.0625rem;
  line-height: 1.25;
  margin: 0 0 .5rem;
}
.industry__desc {
  font-size: .85rem;
  line-height: 1.5;
  color: var(--muted);
  margin: 0;
}

/* ---------- 14. FAQ ---------- */
.faq { padding: var(--section-pad) 0; }
.faq__head { margin: 0 0 clamp(2rem, 4vw, 2.75rem); }
.faq__title { margin: 0; }
.faq__list {
  max-width: 820px;
  border-top: 1px solid var(--border);
}
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item__q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 1.35rem 0;
  cursor: pointer;
  list-style: none;
  font-family: "Inter Tight", sans-serif;
  font-weight: 600;
  font-size: 1.125rem;
  line-height: 1.35;
  color: var(--ink);
  transition: color .15s var(--ease);
}
.faq-item__q::-webkit-details-marker { display: none; }
.faq-item__q::marker { content: ""; }
.faq-item__q:hover { color: var(--cyan-strong); }
.faq-item__icon {
  flex: none;
  font-size: 1.25rem;
  color: var(--cyan-strong);
  transition: transform .2s var(--ease);
}
.faq-item[open] .faq-item__icon { transform: rotate(45deg); }
.faq-item__a {
  padding: 0 0 1.5rem;
  max-width: 68ch;
}
.faq-item__a p {
  margin: 0;
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 15. Contact page ---------- */
.contact { padding: clamp(3rem, 7vw, 5.5rem) 0 var(--section-pad); }
.contact__inner { max-width: 720px; margin-inline: auto; }
.contact__head { margin-bottom: clamp(2rem, 4vw, 2.75rem); }
.contact__title { margin: 0 0 .75rem; font-size: clamp(2rem, 4.5vw, 2.75rem); }
.contact__intro {
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--muted);
  margin: 0;
  max-width: 54ch;
}

.contact__form {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
}
.form-field { display: flex; flex-direction: column; gap: .45rem; }
.form-field--full { grid-column: 1 / -1; }
.form-field label {
  font-family: "Inter Tight", sans-serif;
  font-weight: 600;
  font-size: .9375rem;
  color: var(--ink);
}
.form-field__hint {
  margin: 0;
  font-size: .875rem;
  line-height: 1.5;
  color: var(--muted);
}
.form-field input,
.form-field textarea {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: .75rem .9rem;
  transition: border-color .15s var(--ease), box-shadow .15s var(--ease);
}
.form-field textarea { resize: vertical; min-height: 150px; line-height: 1.55; }
.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--cyan-strong);
  box-shadow: 0 0 0 3px rgba(6, 73, 212,.15);
}
.form-field input:user-invalid,
.form-field textarea:user-invalid { border-color: var(--pink); }
.contact__honeypot { position: absolute !important; left: -9999px; width: 1px; height: 1px; opacity: 0; }
.contact__submit-row { margin-top: .25rem; }
.contact__submit-row .btn {
  width: 100%;
  justify-content: center;
  padding-top: 1.15rem;
  padding-bottom: 1.15rem;
  font-size: 1.0625rem;
}
.btn:disabled { opacity: .6; cursor: default; }
.contact__error {
  grid-column: 1 / -1;
  margin: 0;
  font-size: .9375rem;
  font-weight: 500;
  color: #b91c1c;
}

/* Success state */
.contact__success {
  text-align: center;
  max-width: 480px;
  margin: clamp(1.5rem, 4vw, 3rem) auto;
  padding: clamp(2rem, 4vw, 2.75rem);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-md);
}
.contact__success-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: rgba(6, 73, 212,.1);
  color: var(--cyan-strong);
  font-size: 2.25rem;
  margin-bottom: 1.1rem;
}
.contact__success-title { margin: 0 0 .4rem; font-size: 1.5rem; }
.contact__success-text { margin: 0; font-size: 1.0625rem; color: var(--muted); }

@media (max-width: 620px) {
  .contact__form { grid-template-columns: 1fr; }
}

/* ---------- 16. Footer ---------- */
.site-footer {
  background: var(--dark);
  color: #cbd5e1;
  padding: 2.5rem 0;
}
.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem 2rem;
}
.site-footer__copy { font-size: .875rem; color: #94a3b8; margin: 0; }
.site-footer__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}
.site-footer__nav a { font-size: .875rem; color: #cbd5e1; }
.site-footer__nav a:hover { color: #ffffff; text-decoration: none; }
@media (max-width: 560px) {
  .site-footer__inner { flex-direction: column; text-align: center; }
}

/* ---------- Legal pages (Terms, Privacy) ---------- */
.legal { padding: clamp(3rem, 7vw, 5.5rem) 0 var(--section-pad); }
.legal__inner { max-width: 820px; margin-inline: auto; }
.legal__head { margin-bottom: clamp(2rem, 4vw, 2.75rem); }
.legal__title { margin-bottom: .5rem; }
.legal__lead { color: var(--muted); margin: 0; }
.legal__body { color: var(--text); }
.legal__body > *:first-child { margin-top: 0; }
.legal__body h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 2.75rem 0 1rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
}
.legal__body h3 { font-size: 1.15rem; font-weight: 600; margin: 1.75rem 0 .5rem; }
.legal__body p { line-height: 1.7; margin: 0 0 1rem; }
.legal__body ol, .legal__body ul { line-height: 1.7; padding-left: 1.5rem; margin: 0 0 1.25rem; }
.legal__body li { margin-bottom: .85rem; }
.legal__body li::marker { color: var(--faint); }
.legal__body address { font-style: normal; line-height: 1.6; margin: 0 0 1rem; }
.legal__body a { color: var(--cyan-strong); }
.legal__note {
  font-weight: 600;
  padding: 1rem 1.25rem;
  border-radius: var(--radius-sm);
  background: rgba(6, 73, 212, .06);
}

/* ---------- 16. Responsive ---------- */
@media (max-width: 900px) {
  .header__nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    padding: .5rem 1.5rem 1.25rem;
    margin-left: 0;
    display: none;
  }
  .header__nav.is-open { display: flex; }
  .header__nav a { width: 100%; padding: .85rem 0; border-bottom: 1px solid var(--border-soft); font-size: 1.05rem; }
  .header__cta { display: none; }
  .header__toggle { display: inline-flex; }
}

@media (max-width: 760px) {
  .hero__cards { grid-template-columns: 1fr; max-width: 460px; margin-inline: auto; }
}

@media (max-width: 560px) {
  .hero__actions { flex-direction: column; align-items: stretch; }
  .hero__actions .btn { justify-content: center; }
}

/* Proof */
@media (max-width: 860px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .proof__tags { grid-template-columns: 1fr; gap: 2rem; }
}
@media (max-width: 480px) {
  .hero__title-1 { font-size: 2.2rem; }   /* fit headline on one line */
  .stats { grid-template-columns: 1fr; }
}

/* How It Works */
@media (max-width: 880px) {
  .how__grid { grid-template-columns: 1fr; gap: 2.5rem; }
}

/* Monitoring */
@media (max-width: 880px) {
  .monitoring__grid { grid-template-columns: 1fr; gap: 2.5rem; align-items: start; }
}

/* Performance */
@media (max-width: 800px) {
  .compare { flex-direction: column; }
}

/* Gases */
@media (max-width: 720px) {
  .gas-features { grid-template-columns: 1fr; }
  .gas-other { grid-template-columns: 1fr; gap: 1.5rem; }
}

/* Industries */
@media (max-width: 1000px) {
  .industry-row { grid-template-columns: repeat(3, 1fr); gap: 2rem; }
}
@media (max-width: 620px) {
  .industry-row { grid-template-columns: repeat(1, 1fr); }
}
@media (max-width: 400px) {
  .industry-row { grid-template-columns: 1fr; }
}

/* ---------- Motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
  /* Hero gas: the canvas sim renders a single static frame in this mode (see js/hero-gas.js) */
}