/* ==========================================================================
   VGAS - Precision Gas Mixture
   Design system. Brand colours come from the VGAS cylinder label:
   blue #1D58A8 / red #E72D4B.
   ========================================================================== */

/* ---------- tokens ------------------------------------------------------ */
:root {
  --blue-900: #0F3B78;
  --blue-800: #17468A;
  --blue-700: #1D58A8;   /* brand primary */
  --blue-600: #2A6FC4;
  --blue-300: #9FC2EA;
  --blue-100: #DCE9F8;
  --blue-50:  #EEF4FC;

  --red-600:  #C81C34;
  --red-500:  #E0243F;
  --red-400:  #E72D4B;   /* brand accent, matches the logo */
  --red-50:   #FDECEF;

  --navy-900: #0B1A30;
  --navy-800: #102744;
  --navy-700: #1A3A61;

  --ink:       #16202D;
  --slate-700: #3A4A5C;
  --slate-600: #5B7290;
  --slate-400: #93A4B8;
  --line:      #E1E8F0;
  --mist:      #F4F7FA;
  --paper:     #FFFFFF;

  --amber-500: #E07C1E;
  --green-600: #2F8F63;

  --radius-sm: 8px;
  --radius:    14px;
  --radius-lg: 22px;

  --shadow-sm: 0 1px 2px rgba(11,26,48,.06), 0 2px 6px rgba(11,26,48,.05);
  --shadow:    0 2px 6px rgba(11,26,48,.06), 0 12px 28px -10px rgba(11,26,48,.18);
  --shadow-lg: 0 4px 12px rgba(11,26,48,.08), 0 32px 60px -24px rgba(11,26,48,.32);

  --wrap: 1200px;
  --gutter: clamp(18px, 4vw, 40px);

  --font-display: "Outfit", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-body:    "Inter", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-mono:    "JetBrains Mono", ui-monospace, SFMono-Regular, Consolas, monospace;

  --ease: cubic-bezier(.22,.61,.36,1);
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.62;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

img, svg { max-width: 100%; }
img { height: auto; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.14;
  letter-spacing: -.018em;
  color: var(--navy-900);
  margin: 0 0 .5em;
  text-wrap: balance;
}
h1 { font-size: clamp(2.1rem, 1.2rem + 3.6vw, 3.9rem); font-weight: 700; }
h2 { font-size: clamp(1.65rem, 1.1rem + 2.1vw, 2.6rem); }
h3 { font-size: clamp(1.15rem, 1rem + .8vw, 1.5rem); }
h4 { font-size: 1.02rem; letter-spacing: -.005em; }
p  { margin: 0 0 1.1em; }
p:last-child { margin-bottom: 0; }

a { color: var(--blue-700); text-decoration: none; }
a:hover { color: var(--blue-600); }

:focus-visible {
  outline: 3px solid var(--blue-600);
  outline-offset: 2px;
  border-radius: 4px;
}

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--blue-700); color: #fff; padding: 12px 20px; border-radius: 0 0 8px 0;
}
.skip-link:focus { left: 0; color: #fff; }

/* ---------- layout ------------------------------------------------------ */
.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: var(--gutter); }
.section { padding-block: clamp(56px, 7vw, 104px); }
.section--tight { padding-block: clamp(40px, 5vw, 68px); }
.section--mist { background: var(--mist); }
.section--rule { border-top: 1px solid var(--line); }

.grid { display: grid; gap: clamp(18px, 2.4vw, 30px); }
.grid--2 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid--3 { grid-template-columns: repeat(auto-fit, minmax(258px, 1fr)); }
.grid--4 { grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); }

.lede {
  font-size: clamp(1.04rem, .98rem + .35vw, 1.22rem);
  color: var(--slate-600);
  max-width: 62ch;
}

/* ---------- section heading -------------------------------------------- */
.eyebrow {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--font-display);
  font-size: .78rem; font-weight: 600; letter-spacing: .16em; text-transform: uppercase;
  color: var(--blue-700); margin-bottom: 14px;
}
.eyebrow::before {
  content: ""; width: 26px; height: 3px; border-radius: 2px;
  background: linear-gradient(90deg, var(--blue-700) 55%, var(--red-400) 55%);
}
.on-dark .eyebrow { color: var(--blue-300); }
.on-dark .eyebrow::before { background: linear-gradient(90deg, #fff 55%, var(--red-400) 55%); }

.head { max-width: 68ch; margin-bottom: clamp(30px, 4vw, 52px); }
.head--center { margin-inline: auto; text-align: center; }
.head--center .eyebrow { justify-content: center; }

/* ---------- buttons ----------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-display); font-size: .95rem; font-weight: 600;
  padding: 13px 24px; border-radius: 999px; border: 1.5px solid transparent;
  cursor: pointer; transition: .2s var(--ease);
  transition-property: background-color, color, border-color, transform, box-shadow;
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; flex: none; }
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn--primary { background: var(--blue-700); color: #fff; box-shadow: 0 8px 20px -10px rgba(29,88,168,.8); }
.btn--primary:hover { background: var(--blue-800); color: #fff; }

.btn--accent { background: var(--red-500); color: #fff; box-shadow: 0 8px 20px -10px rgba(224,36,63,.8); }
.btn--accent:hover { background: var(--red-600); color: #fff; }

.btn--ghost { border-color: var(--line); color: var(--navy-900); background: var(--paper); }
.btn--ghost:hover { border-color: var(--blue-300); background: var(--blue-50); color: var(--blue-800); }

.on-dark .btn--ghost { border-color: rgba(255,255,255,.28); color: #fff; background: transparent; }
.on-dark .btn--ghost:hover { border-color: #fff; background: rgba(255,255,255,.1); color: #fff; }

.btn-row { display: flex; flex-wrap: wrap; gap: 12px; }

/* ---------- header ------------------------------------------------------ */
.site-header {
  position: sticky; top: 0; z-index: 60;
  background: rgba(255,255,255,.92);
  backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-header::after {
  content: ""; display: block; height: 3px;
  background: linear-gradient(90deg, var(--blue-700) 0 46%, var(--red-400) 46% 100%);
}
.nav { display: flex; align-items: center; gap: 22px; height: 74px; }
.brand { display: flex; align-items: center; flex: none; }
.brand img { height: 34px; width: auto; display: block; }

.nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav-links a {
  font-family: var(--font-display); font-weight: 500; font-size: .95rem;
  color: var(--slate-700); padding: 9px 14px; border-radius: 999px; transition: .18s var(--ease);
}
.nav-links a:hover { background: var(--blue-50); color: var(--blue-800); }
.nav-links a[aria-current="page"] { color: var(--blue-700); font-weight: 600; background: var(--blue-50); }

.nav-actions { display: flex; align-items: center; gap: 10px; flex: none; }

.lang {
  display: inline-flex; background: var(--mist); border: 1px solid var(--line);
  border-radius: 999px; padding: 3px; gap: 2px;
}
.lang button {
  font-family: var(--font-display); font-size: .76rem; font-weight: 600; letter-spacing: .06em;
  text-transform: uppercase; color: var(--slate-600); background: none; border: 0;
  padding: 6px 11px; border-radius: 999px; cursor: pointer; transition: .18s var(--ease);
}
.lang button:hover { color: var(--blue-700); }
.lang button[aria-pressed="true"] { background: var(--blue-700); color: #fff; }

.burger {
  display: none; width: 44px; height: 44px; border: 1px solid var(--line);
  background: var(--paper); border-radius: 12px; cursor: pointer;
  align-items: center; justify-content: center;
}
.burger span { display: block; width: 19px; height: 2px; background: var(--navy-900); border-radius: 2px; position: relative; }
.burger span::before, .burger span::after {
  content: ""; position: absolute; left: 0; width: 19px; height: 2px;
  background: var(--navy-900); border-radius: 2px;
}
.burger span::before { top: -6px; }
.burger span::after  { top: 6px; }

@media (max-width: 1000px) {
  .burger { display: inline-flex; }
  .nav-links {
    position: fixed; inset: 77px 0 auto; flex-direction: column; align-items: stretch;
    gap: 2px; background: var(--paper); border-bottom: 1px solid var(--line);
    padding: 14px var(--gutter) 22px; box-shadow: var(--shadow); margin-left: 0;
  }
  .nav-links[hidden] { display: none; }
  .nav-links a { padding: 13px 14px; font-size: 1.02rem; }
  .nav { gap: 12px; }
  .nav-actions { margin-left: auto; }
}

/* ---------- hero -------------------------------------------------------- */
.hero {
  position: relative; overflow: hidden; color: #fff;
  background-color: #0B1A30;
  background-image:
    radial-gradient(1100px 620px at 78% 8%, rgba(42,111,196,.42), transparent 62%),
    radial-gradient(760px 520px at 10% 92%, rgba(231,45,75,.20), transparent 66%),
    linear-gradient(168deg, #112B4C 0%, #0B1A30 100%);
}
.hero::before {
  content: ""; position: absolute; inset: 0; opacity: .5;
  background-image:
    linear-gradient(rgba(255,255,255,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.055) 1px, transparent 1px);
  background-size: 68px 68px;
  -webkit-mask-image: radial-gradient(900px 560px at 62% 34%, #000 30%, transparent 78%);
  mask-image: radial-gradient(900px 560px at 62% 34%, #000 30%, transparent 78%);
}
.hero-inner {
  position: relative; display: grid; gap: clamp(28px, 4vw, 56px);
  grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  align-items: center;
  padding-block: clamp(52px, 7vw, 104px);
}
@media (max-width: 940px) { .hero-inner { grid-template-columns: 1fr; } }

.hero h1 { color: #fff; margin-bottom: 18px; }
.hero h1 em { font-style: normal; color: var(--blue-300); }
.hero .lede { color: rgba(233,240,248,.82); max-width: 54ch; }
.hero .btn-row { margin-top: 30px; }

.hero-stats {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(116px, 1fr));
  gap: clamp(18px, 2.4vw, 30px);
  margin-top: clamp(34px, 5vw, 54px);
  padding-top: 26px; border-top: 1px solid rgba(255,255,255,.14);
}
.hero-stat b {
  display: block; font-family: var(--font-display); font-weight: 700;
  font-size: clamp(1.5rem, 1.1rem + 1.4vw, 2.1rem); color: #fff; line-height: 1.1;
}
.hero-stat span { font-size: .84rem; color: rgba(233,240,248,.66); letter-spacing: .03em; }

.hero-art { position: relative; display: flex; justify-content: center; align-items: center; min-height: 300px; }
.hero-art img.cyl { height: clamp(300px, 42vw, 470px); width: auto; filter: drop-shadow(0 40px 60px rgba(0,0,0,.5)); }
.hero-chip {
  position: absolute; display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.95); color: var(--navy-900);
  border-radius: 999px; padding: 8px 15px 8px 9px;
  font-family: var(--font-mono); font-size: .82rem; font-weight: 600;
  box-shadow: 0 12px 26px -12px rgba(0,0,0,.7);
  animation: float 7s var(--ease) infinite;
}
.hero-chip img { width: 26px; height: 26px; }
.hero-chip i { font-style: normal; color: var(--slate-600); font-weight: 500; }
.hero-chip--1 { top: 12%;  left: 2%;  animation-delay: -.4s; }
.hero-chip--2 { top: 42%;  right: 0;  animation-delay: -2.6s; }
.hero-chip--3 { bottom: 13%; left: 4%; animation-delay: -4.8s; }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-11px); } }
@media (prefers-reduced-motion: reduce) { .hero-chip { animation: none; } }
@media (max-width: 560px) { .hero-chip--2 { display: none; } }

/* ---------- cards ------------------------------------------------------- */
.card {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: clamp(20px, 2.4vw, 28px); transition: .22s var(--ease);
  transition-property: transform, box-shadow, border-color;
  height: 100%; display: flex; flex-direction: column;
}
.card--link:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--blue-300); }
.card h3 { margin-bottom: .4em; }
.card p { color: var(--slate-600); font-size: .96rem; }
.card .more {
  margin-top: auto; padding-top: 16px; display: inline-flex; align-items: center; gap: 7px;
  font-family: var(--font-display); font-weight: 600; font-size: .9rem; color: var(--blue-700);
}
.card .more svg { width: 17px; height: 17px; transition: transform .2s var(--ease); }
.card--link:hover .more svg { transform: translateX(3px); }

.ico-badge {
  width: 48px; height: 48px; border-radius: 13px; display: grid; place-items: center;
  background: var(--blue-50); color: var(--blue-700); margin-bottom: 16px; flex: none;
}
.ico-badge svg { width: 25px; height: 25px; }
.ico-badge--accent { background: var(--red-50); color: var(--red-600); }

.prod {
  display: flex; flex-direction: column; align-items: center; text-align: center;
  background: linear-gradient(180deg, var(--mist), var(--paper) 58%);
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 26px 22px 24px; height: 100%; transition: .22s var(--ease);
}
.prod:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--blue-300); }
.prod img { height: 190px; width: auto; margin-bottom: 18px; }
.prod h3 { font-size: 1.12rem; margin-bottom: .25em; }
.prod .meta { font-family: var(--font-mono); font-size: .8rem; color: var(--slate-600); }
.prod p { font-size: .9rem; color: var(--slate-600); margin-top: 10px; }

/* ---------- gas chips & grid ------------------------------------------- */
.chip {
  display: inline-flex; align-items: center; gap: 7px;
  border-radius: 999px; padding: 4px 12px;
  font-family: var(--font-mono); font-size: .78rem; font-weight: 600;
  background: var(--mist); color: var(--slate-700); border: 1px solid var(--line);
  white-space: nowrap;
}
.chip--toxic       { background: #FDEEF0; border-color: #F6CDD4; color: #9C1528; }
.chip--combustible { background: #FCF1E4; border-color: #F3DBBC; color: #8A4B0D; }
.chip--oxygen      { background: var(--blue-50); border-color: var(--blue-100); color: var(--blue-900); }
.chip--inert       { background: #EEF2F6; border-color: #DCE4EC; color: #3F5570; }

.legend { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 16px; }

.gas-grid { display: grid; gap: 14px; grid-template-columns: repeat(auto-fill, minmax(184px, 1fr)); }
.gas-card {
  display: flex; align-items: center; gap: 13px;
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius-sm);
  padding: 13px 15px; transition: .2s var(--ease);
}
.gas-card:hover { border-color: var(--blue-300); box-shadow: var(--shadow-sm); transform: translateY(-2px); }
.gas-card img { width: 46px; height: 46px; flex: none; }
.gas-card b { display: block; font-family: var(--font-display); font-size: 1.04rem; color: var(--navy-900); line-height: 1.2; }
.gas-card span { font-size: .79rem; color: var(--slate-600); }

/* ---------- feature list ------------------------------------------------ */
.ticks { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.ticks li { display: flex; gap: 11px; align-items: flex-start; font-size: .97rem; color: var(--slate-700); }
.ticks svg { width: 20px; height: 20px; flex: none; color: var(--blue-700); margin-top: 2px; }
.on-dark .ticks li { color: rgba(233,240,248,.85); }
.on-dark .ticks svg { color: var(--blue-300); }

/* ---------- split panel ------------------------------------------------- */
.split {
  display: grid; gap: clamp(26px, 4vw, 60px); align-items: center;
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
}
.split--art { display: flex; justify-content: center; }
.panel {
  background: var(--navy-900); color: #fff; border-radius: var(--radius-lg);
  padding: clamp(28px, 4vw, 56px); position: relative; overflow: hidden;
}
.panel h2, .panel h3 { color: #fff; }
.panel p { color: rgba(233,240,248,.78); }
.panel::after {
  content: ""; position: absolute; right: -90px; top: -90px; width: 320px; height: 320px;
  border-radius: 50%; background: radial-gradient(circle, rgba(42,111,196,.32), transparent 68%);
}
.panel > * { position: relative; z-index: 1; }

/* ---------- data table -------------------------------------------------- */
.table-wrap {
  border: 1px solid var(--line); border-radius: var(--radius); background: var(--paper);
  overflow: hidden;
}
.table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; max-height: 72vh; }
table.data { width: 100%; border-collapse: collapse; font-size: .9rem; min-width: 800px; }
table.data th, table.data td { text-align: left; padding: 13px 16px; border-bottom: 1px solid var(--line); vertical-align: top; }
table.data thead th {
  position: sticky; top: 0; z-index: 2;
  background: var(--mist); color: var(--navy-900);
  font-family: var(--font-display); font-weight: 600; font-size: .82rem;
  letter-spacing: .05em; text-transform: uppercase; white-space: nowrap;
  box-shadow: inset 0 -1px 0 var(--line);
}
table.data tbody tr:hover { background: var(--blue-50); }
table.data tbody tr:last-child td { border-bottom: 0; }
table.data td.sku { font-family: var(--font-mono); font-size: .84rem; color: var(--blue-800); font-weight: 600; white-space: nowrap; }
table.data td.mix { min-width: 250px; }
table.data td.nowrap, table.data th.nowrap { white-space: nowrap; }
table.data .chips { display: flex; flex-wrap: wrap; gap: 5px; }

.tag {
  display: inline-block; font-size: .72rem; font-weight: 600; letter-spacing: .04em;
  padding: 3px 9px; border-radius: 999px; text-transform: uppercase;
  font-family: var(--font-display); white-space: nowrap;
}
.tag--flam { background: var(--red-50); color: var(--red-600); }
.tag--nonflam { background: #EAF4EE; color: #226C4A; }

/* ---------- filter bar -------------------------------------------------- */
.filters {
  display: grid; gap: 14px; align-items: end;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; margin-bottom: 20px; box-shadow: var(--shadow-sm);
}
.field label {
  display: block; font-family: var(--font-display); font-size: .76rem; font-weight: 600;
  letter-spacing: .08em; text-transform: uppercase; color: var(--slate-600); margin-bottom: 6px;
}
.field input, .field select,
.form-field input, .form-field select, .form-field textarea {
  width: 100%; font-family: var(--font-body); font-size: .95rem; color: var(--ink);
  background: var(--paper); border: 1.5px solid var(--line); border-radius: 10px;
  padding: 11px 13px; transition: .18s var(--ease);
}
.field input:focus, .field select:focus,
.form-field input:focus, .form-field select:focus, .form-field textarea:focus {
  border-color: var(--blue-600); outline: none; box-shadow: 0 0 0 3px var(--blue-50);
}
.field.search { position: relative; grid-column: span 2; }
@media (max-width: 560px) { .field.search { grid-column: auto; } }
.field .btn { width: 100%; justify-content: center; }
.field.search input { padding-left: 40px; }
.field.search svg {
  position: absolute; left: 13px; bottom: 13px; width: 18px; height: 18px; color: var(--slate-400);
  pointer-events: none;
}
.result-line {
  display: flex; flex-wrap: wrap; gap: 12px; align-items: baseline;
  font-size: .9rem; color: var(--slate-600); margin-bottom: 14px;
}
.result-line b { color: var(--navy-900); font-family: var(--font-display); }

.empty { padding: 54px 20px; text-align: center; color: var(--slate-600); }
.empty svg { width: 34px; height: 34px; color: var(--slate-400); margin-bottom: 10px; }

/* ---------- stat strip -------------------------------------------------- */
.stats {
  display: grid; gap: 1px; background: var(--line);
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}
.stat { background: var(--paper); padding: 26px 22px; }
.stat b { display: block; font-family: var(--font-display); font-weight: 700; font-size: 1.9rem; color: var(--blue-700); line-height: 1.1; }
.stat span { font-size: .88rem; color: var(--slate-600); }

/* ---------- steps ------------------------------------------------------- */
.steps { counter-reset: s; display: grid; gap: 22px; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.step { position: relative; padding-top: 54px; }
.step::before {
  counter-increment: s; content: counter(s, decimal-leading-zero);
  position: absolute; top: 0; left: 0;
  font-family: var(--font-display); font-weight: 700; font-size: 1.05rem;
  width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  background: var(--blue-700); color: #fff;
}
.step h4 { margin-bottom: .35em; }
.step p { font-size: .94rem; color: var(--slate-600); }

/* ---------- callout / notice ------------------------------------------- */
.notice {
  display: flex; gap: 14px; align-items: flex-start;
  background: var(--blue-50); border: 1px solid var(--blue-100);
  border-radius: var(--radius); padding: 18px 20px; font-size: .94rem; color: var(--slate-700);
}
.notice svg { width: 22px; height: 22px; color: var(--blue-700); flex: none; margin-top: 1px; }
.notice--warn { background: var(--red-50); border-color: #F6CDD4; }
.notice--warn svg { color: var(--red-600); }

/* ---------- faq --------------------------------------------------------- */
.faq { border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary {
  list-style: none; cursor: pointer; padding: 20px 44px 20px 0; position: relative;
  font-family: var(--font-display); font-weight: 600; font-size: 1.04rem; color: var(--navy-900);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: ""; position: absolute; right: 10px; top: 26px; width: 10px; height: 10px;
  border-right: 2px solid var(--blue-700); border-bottom: 2px solid var(--blue-700);
  transform: rotate(45deg); transition: transform .2s var(--ease);
}
.faq details[open] summary::after { transform: rotate(225deg); top: 30px; }
.faq .answer { padding: 0 0 22px; color: var(--slate-600); font-size: .97rem; max-width: 76ch; }

/* ---------- form -------------------------------------------------------- */
.form-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
.form-field.full { grid-column: 1 / -1; }
.form-field textarea { min-height: 132px; resize: vertical; }
.form-note { font-size: .84rem; color: var(--slate-400); }
.form-status { margin-top: 14px; font-size: .94rem; }

/* ---------- cta band ---------------------------------------------------- */
.cta-band {
  background-color: #0B1A30;
  background-image:
    radial-gradient(700px 420px at 82% 12%, rgba(42,111,196,.42), transparent 64%),
    linear-gradient(160deg, #12294A, #0B1A30);
  color: #fff; border-radius: var(--radius-lg);
  padding: clamp(32px, 4.6vw, 62px);
  display: grid; gap: 26px; align-items: center;
  grid-template-columns: minmax(0, 1fr) auto;
}
@media (max-width: 760px) { .cta-band { grid-template-columns: 1fr; } }
.cta-band h2 { color: #fff; margin-bottom: .3em; }
.cta-band p { color: rgba(233,240,248,.8); margin: 0; max-width: 56ch; }

/* ---------- footer ------------------------------------------------------ */
.site-footer { background: var(--navy-900); color: rgba(233,240,248,.72); margin-top: clamp(56px, 7vw, 96px); }
.site-footer::before {
  content: ""; display: block; height: 4px;
  background: linear-gradient(90deg, var(--blue-700) 0 46%, var(--red-400) 46% 100%);
}
.footer-top {
  display: grid; gap: clamp(26px, 4vw, 52px);
  grid-template-columns: minmax(240px, 1.4fr) repeat(auto-fit, minmax(150px, 1fr));
  padding-block: clamp(42px, 5vw, 68px);
}
.site-footer img.mark { height: 56px; width: auto; margin-bottom: 18px; }
.site-footer h4 {
  color: #fff; font-size: .82rem; letter-spacing: .13em; text-transform: uppercase;
  margin-bottom: 15px;
}
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.site-footer a { color: rgba(233,240,248,.72); font-size: .94rem; }
.site-footer a:hover { color: #fff; }
.footer-contact li { display: flex; gap: 10px; align-items: flex-start; font-size: .94rem; }
.footer-contact svg { width: 17px; height: 17px; color: var(--blue-300); flex: none; margin-top: 4px; }
.footer-bottom {
  border-top: 1px solid rgba(255,255,255,.12); padding-block: 20px;
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: space-between;
  font-size: .84rem; color: rgba(233,240,248,.55);
}

/* ---------- page header (inner pages) ----------------------------------- */
.page-head {
  background-color: #0B1A30;
  background-image:
    radial-gradient(720px 380px at 88% 0%, rgba(42,111,196,.34), transparent 64%),
    linear-gradient(165deg, #12294A, #0B1A30);
  color: #fff; padding-block: clamp(44px, 5.5vw, 78px);
  position: relative; overflow: hidden;
}
.page-head::before {
  content: ""; position: absolute; inset: 0; opacity: .45;
  background-image:
    linear-gradient(rgba(255,255,255,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.05) 1px, transparent 1px);
  background-size: 62px 62px;
  -webkit-mask-image: radial-gradient(760px 420px at 72% 30%, #000 24%, transparent 76%);
  mask-image: radial-gradient(760px 420px at 72% 30%, #000 24%, transparent 76%);
}
.page-head .wrap { position: relative; }
.page-head h1 { color: #fff; margin-bottom: .32em; }
.page-head p { color: rgba(233,240,248,.8); max-width: 62ch; margin: 0; }
.crumbs { font-size: .84rem; color: rgba(233,240,248,.55); margin-bottom: 14px; }
.crumbs a { color: rgba(233,240,248,.75); }
.crumbs a:hover { color: #fff; }

/* ---------- utilities --------------------------------------------------- */
.on-dark { color: rgba(233,240,248,.8); }
.on-dark h1, .on-dark h2, .on-dark h3, .on-dark h4 { color: #fff; }
.mono { font-family: var(--font-mono); }
.center { text-align: center; }
.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;
}

.js .reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s var(--ease), transform .6s var(--ease); }
.js .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .js .reveal { opacity: 1; transform: none; transition: none; } }

/* ---------- print ------------------------------------------------------- */
@media print {
  .site-header, .site-footer, .filters, .cta-band, .btn, .hero-art, .burger, .lang { display: none !important; }
  body { font-size: 11pt; color: #000; }
  .hero, .page-head, .panel, .cta-band {
    background: #fff !important; color: #000 !important; padding-block: 12pt;
  }
  .hero::before, .page-head::before, .panel::after { display: none; }
  .hero h1, .page-head h1, .hero .lede, .page-head p,
  .panel h2, .panel h3, .panel p { color: #000 !important; }
  .section { padding-block: 10pt; }
  .table-scroll { max-height: none; overflow: visible; }
  table.data { min-width: 0; font-size: 8.5pt; }
  table.data thead th { background: #eee !important; color: #000 !important; position: static; }
  .table-wrap, .card, .prod { border-color: #bbb; box-shadow: none; break-inside: avoid; }
  .reveal { opacity: 1; transform: none; }
}

/* ---------- gas tiles (typographic, no illustration) -------------------- */
.gas-tiles {
  display: grid; gap: 12px;
  grid-template-columns: repeat(auto-fill, minmax(178px, 1fr));
}
.gas-tile {
  position: relative; background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius-sm); padding: 16px 16px 14px 18px; overflow: hidden;
  transition: .2s var(--ease);
  transition-property: transform, box-shadow, border-color;
}
.gas-tile:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); border-color: var(--blue-300); }
.gas-tile__cat { position: absolute; left: 0; top: 0; bottom: 0; width: 4px; }
.gas-tile--toxic       .gas-tile__cat { background: var(--red-500); }
.gas-tile--combustible .gas-tile__cat { background: var(--amber-500); }
.gas-tile--oxygen      .gas-tile__cat { background: var(--blue-700); }
.gas-tile--inert       .gas-tile__cat { background: var(--slate-600); }
.gas-tile__formula {
  display: block; font-family: var(--font-display); font-weight: 700;
  font-size: 1.6rem; line-height: 1.05; color: var(--navy-900); letter-spacing: -.02em;
}
.gas-tile__name { display: block; font-size: .9rem; color: var(--slate-700); margin-top: 2px; }
.gas-tile__range {
  display: block; font-family: var(--font-mono); font-size: .72rem; color: var(--slate-400);
  margin-top: 8px; line-height: 1.45;
}

/* ---------- product photography ---------------------------------------- */
.shot {
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(180deg, var(--mist), #fff 70%);
  border-radius: var(--radius); padding: 22px;
}
.shot img { display: block; }
.prod-photo { height: 210px; width: auto; object-fit: contain; }
.prod-photo--wide { height: 170px; }

.hero-art img.shot-cyl {
  height: clamp(290px, 44vw, 460px); width: auto;
  filter: drop-shadow(0 44px 56px rgba(0,0,0,.55));
}

.figure { margin: 0; }
.figure img { border-radius: var(--radius); display: block; width: 100%; }
.figure figcaption { font-size: .84rem; color: var(--slate-400); margin-top: 10px; }

/* ---------- spec list --------------------------------------------------- */
.specs { display: grid; gap: 0; border-top: 1px solid var(--line); }
.specs > div {
  display: grid; grid-template-columns: minmax(130px, .8fr) 1.6fr; gap: 14px;
  padding: 13px 0; border-bottom: 1px solid var(--line); font-size: .95rem;
}
.specs dt, .specs .k {
  font-family: var(--font-display); font-weight: 600; color: var(--navy-900); margin: 0;
}
.specs dd, .specs .v { margin: 0; color: var(--slate-600); }
.on-dark .specs { border-color: rgba(255,255,255,.16); }
.on-dark .specs > div { border-color: rgba(255,255,255,.16); }
.on-dark .specs .k { color: #fff; }
.on-dark .specs .v { color: rgba(233,240,248,.78); }

/* ---------- misc -------------------------------------------------------- */
.muted { color: var(--slate-400); font-size: .8rem; }
.sds-link { display: inline-flex; align-items: center; gap: 6px; font-size: .84rem; font-weight: 600; }
.sds-link svg { width: 15px; height: 15px; }
table.data td .chips .chip { font-size: .72rem; padding: 2px 8px; }

.pill-row { display: flex; flex-wrap: wrap; gap: 10px; }
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--paper); border: 1px solid var(--line); border-radius: 999px;
  padding: 9px 16px 9px 12px; font-size: .92rem; color: var(--slate-700);
}
.pill svg { width: 18px; height: 18px; color: var(--blue-700); }
.on-dark .pill { background: rgba(255,255,255,.08); border-color: rgba(255,255,255,.18); color: #fff; }
.on-dark .pill svg { color: var(--blue-300); }

@media print {
  .gas-tile, .shot, .pill { break-inside: avoid; }
  .shot { background: #fff !important; }
}

/* ---------- locations ---------------------------------------------------- */
.loc-grid {
  display: grid; gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(238px, 1fr));
}
.loc-card {
  display: flex; align-items: center; gap: 15px;
  background: var(--paper); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 18px 20px; transition: .2s var(--ease);
  transition-property: transform, box-shadow, border-color;
}
.loc-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); border-color: var(--blue-300); }
.loc-card .ico-badge { margin-bottom: 0; width: 42px; height: 42px; border-radius: 12px; }
.loc-card .ico-badge svg { width: 21px; height: 21px; }
.loc-card b {
  display: block; font-family: var(--font-display); font-weight: 600;
  font-size: 1.12rem; color: var(--navy-900); line-height: 1.2;
}
.loc-card span { display: block; font-size: .88rem; color: var(--slate-600); }

@media print { .loc-card { break-inside: avoid; } }