#isg-petrol-home {
  --petrol: #08232d;
  --petrol-2: #0c3441;
  --petrol-3: #124b5b;
  --paper: #f3f1ea;
  --white: #ffffff;
  --orange: #f15a24;
  --orange-dark: #d94512;
  --steel: #52717d;
  --metal: #9ca9ad;
  --ink: #092732;
  --muted: #617078;
  --line: rgba(8, 35, 45, 0.16);
  --shell: min(1320px, calc(100% - 64px));
  --display: "Arial Narrow", "Roboto Condensed", Impact, sans-serif;
  --body: Inter, Arial, Helvetica, sans-serif;
}

 #isg-petrol-home,  #isg-petrol-home * { box-sizing: border-box; }
 #isg-petrol-home { width: 100%; margin: 0; background: var(--paper); color: var(--ink); font-family: var(--body); font-size: 16px; line-height: 1.5; }
 #isg-petrol-home a { color: inherit; text-decoration: none; }
 #isg-petrol-home button,  #isg-petrol-home input { font: inherit; }
 #isg-petrol-home button { border-radius: 0; }
 #isg-petrol-home img { max-width: none; }
 #isg-petrol-home .isg-home { overflow-x: clip; overflow-y: visible; background: var(--paper); }
 #isg-petrol-home .shell { width: var(--shell); margin: 0 auto; }
 #isg-petrol-home .section { padding: 112px 0; }

 #isg-petrol-home .kicker {
  display: flex; align-items: center; gap: 13px; color: var(--orange);
  font-size: 12px; font-weight: 900; letter-spacing: .18em; text-transform: uppercase;
}
 #isg-petrol-home .kicker i { display: block; width: 34px; height: 2px; background: currentColor; transform: skewX(-25deg); }
 #isg-petrol-home .kicker.light { color: #ff7040; }
 #isg-petrol-home h1,  #isg-petrol-home h2,  #isg-petrol-home h3,  #isg-petrol-home p { margin-top: 0; }
 #isg-petrol-home h1,  #isg-petrol-home h2,  #isg-petrol-home h3 { font-family: var(--display); text-transform: uppercase; letter-spacing: -.025em; }
 #isg-petrol-home h2 { font-size: clamp(48px, 5.4vw, 82px); line-height: .91; margin: 24px 0 0; }
 #isg-petrol-home p { line-height: 1.7; }

 #isg-petrol-home .hero {
  position: relative; min-height: 900px; background: var(--petrol); color: white;
  isolation: isolate; display: flex; flex-direction: column;
}
 #isg-petrol-home .hero-grid {
  position: absolute; inset: 0; z-index: -3; opacity: .22;
  background-image: linear-gradient(rgba(156,169,173,.16) 1px, transparent 1px), linear-gradient(90deg, rgba(156,169,173,.16) 1px, transparent 1px);
  background-size: 74px 74px;
  mask-image: linear-gradient(to right, black, transparent 76%);
}
 #isg-petrol-home .hero:after {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background: linear-gradient(90deg, rgba(8,35,45,.98) 0%, rgba(8,35,45,.87) 42%, rgba(8,35,45,.16) 78%),
  linear-gradient(0deg, var(--petrol) 0%, transparent 24%);
}
 #isg-petrol-home .hero-glow {
  position: absolute; width: 880px; height: 880px; right: -160px; top: -50px; z-index: -1;
  background: radial-gradient(circle, rgba(82,113,125,.75) 0%, rgba(8,35,45,0) 68%);
}
 #isg-petrol-home .hero-layout { flex: 1; display: grid; grid-template-columns: .86fr 1.14fr; align-items: center; padding: 100px 0 90px; }
 #isg-petrol-home .hero-copy { position: relative; z-index: 4; max-width: 710px; }
 #isg-petrol-home .hero h1 { font-size: clamp(70px, 7vw, 112px); line-height: .82; margin: 30px 0 30px; }
 #isg-petrol-home .hero h1 strong { display: block; color: var(--orange); font: inherit; }
 #isg-petrol-home .hero h1 span { display: block; font-size: .64em; margin-top: 14px; }
 #isg-petrol-home .hero-copy > p { max-width: 650px; color: rgba(255,255,255,.74); font-size: 18px; line-height: 1.65; }
 #isg-petrol-home .actions { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 34px; }
 #isg-petrol-home .button {
  min-height: 58px; padding: 0 28px; display: inline-flex; align-items: center; justify-content: center; gap: 32px;
  font-size: 12px; font-weight: 900; letter-spacing: .07em; text-transform: uppercase;
  border: 1px solid transparent; transition: transform .25s, background .25s, color .25s, border-color .25s;
}
 #isg-petrol-home .button:hover { transform: translateY(-3px); }
 #isg-petrol-home .button.primary { background: var(--orange); color: white; }
 #isg-petrol-home .button.primary:hover { background: #ff6a34; }
 #isg-petrol-home .button.ghost { border-color: rgba(255,255,255,.35); color: white; backdrop-filter: blur(6px); }
 #isg-petrol-home .button.ghost:hover { border-color: white; }
 #isg-petrol-home .button.dark { background: var(--petrol); color: white; }
 #isg-petrol-home .hero-proof { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 54px; padding-top: 24px; border-top: 1px solid rgba(255,255,255,.17); }
 #isg-petrol-home .hero-proof div { display: flex; flex-direction: column; gap: 6px; }
 #isg-petrol-home .hero-proof b { font-family: var(--display); font-size: 28px; letter-spacing: .02em; }
 #isg-petrol-home .hero-proof span { max-width: 120px; color: rgba(255,255,255,.5); font-size: 10px; line-height: 1.4; letter-spacing: .1em; text-transform: uppercase; }
 #isg-petrol-home .hero-product { position: absolute; z-index: 1; right: -4vw; top: 40px; width: 64vw; height: 800px; display: grid; place-items: center; }
 #isg-petrol-home .hero-product:before { content: ""; position: absolute; inset: 6% 0 8% 14%; border: 1px solid rgba(156,169,173,.2); transform: skewX(-7deg); }
 #isg-petrol-home .hero-product img { width: 100%; height: 100%; object-fit: contain; filter: saturate(.92) drop-shadow(0 35px 38px rgba(0,0,0,.38)); mix-blend-mode: screen; }
 #isg-petrol-home .product-halo { position: absolute; inset: 15% 8% 8% 16%; background: radial-gradient(circle, rgba(82,113,125,.7), transparent 67%); }
 #isg-petrol-home .tech-tag { position: absolute; display: flex; gap: 10px; align-items: center; padding-left: 24px; font-size: 10px; text-transform: uppercase; }
 #isg-petrol-home .tech-tag:before { content: ""; width: 9px; height: 9px; border: 3px solid var(--orange); border-radius: 50%; box-shadow: 0 0 0 6px rgba(241,90,36,.15); }
 #isg-petrol-home .tech-tag b { font-size: 14px; } #isg-petrol-home .tech-tag span { color: rgba(255,255,255,.45); letter-spacing: .08em; }
 #isg-petrol-home .tag-a { left: 35%; top: 31%; } #isg-petrol-home .tag-b { right: 12%; bottom: 24%; }
 #isg-petrol-home .capacity-stamp { position: absolute; right: 8%; top: 16%; border-left: 1px solid rgba(255,255,255,.24); padding-left: 18px; display: flex; flex-direction: column; }
 #isg-petrol-home .capacity-stamp span,  #isg-petrol-home .capacity-stamp small { color: rgba(255,255,255,.45); font-size: 9px; letter-spacing: .14em; text-transform: uppercase; }
 #isg-petrol-home .capacity-stamp strong { font-family: var(--display); font-size: 30px; letter-spacing: .06em; }
 #isg-petrol-home .hero-bottom { position: relative; z-index: 5; border-top: 1px solid rgba(255,255,255,.13); background: rgba(6,26,34,.78); }
 #isg-petrol-home .trust-row { min-height: 78px; display: grid; grid-template-columns: repeat(4, 1fr); align-items: center; }
 #isg-petrol-home .trust-row span { padding: 0 22px; border-right: 1px solid rgba(255,255,255,.12); color: rgba(255,255,255,.58); font-size: 10px; font-weight: 800; letter-spacing: .12em; text-align: center; }

/* Cinematic product story — scroll driven in page.tsx */
 #isg-petrol-home .product-story { position: relative; height: 520vh; background: #061a22; color: white; }
 #isg-petrol-home .story-sticky { position: sticky; top: 0; height: 100svh; min-height: 680px; overflow: hidden; isolation: isolate; background: radial-gradient(circle at 72% 48%, #174957 0%, #0a2a35 30%, #061a22 72%); }
 #isg-petrol-home .story-sticky:after { content: ""; position: absolute; inset: 0; z-index: 6; pointer-events: none; background: linear-gradient(90deg, rgba(6,26,34,.98) 0%, rgba(6,26,34,.76) 34%, transparent 58%), linear-gradient(0deg, rgba(6,26,34,.92) 0%, transparent 23%, transparent 78%, rgba(6,26,34,.54) 100%); }
 #isg-petrol-home .story-grid { position: absolute; inset: 0; z-index: 0; opacity: .18; background-image: linear-gradient(rgba(156,169,173,.2) 1px,transparent 1px),linear-gradient(90deg,rgba(156,169,173,.2) 1px,transparent 1px); background-size: 82px 82px; mask-image: radial-gradient(circle at 70% 50%, black, transparent 75%); }
 #isg-petrol-home .story-orbit { position: absolute; z-index: 1; border: 1px solid rgba(156,169,173,.16); border-radius: 50%; pointer-events: none; }
 #isg-petrol-home .orbit-one { width: 78vw; height: 78vw; right: -22vw; top: 50%; transform: translateY(-50%); }
 #isg-petrol-home .orbit-two { width: 51vw; height: 51vw; right: -8vw; top: 50%; transform: translateY(-50%); border-color: rgba(241,90,36,.16); }
 #isg-petrol-home .story-word { position: absolute; z-index: 1; left: -1vw; bottom: -3.5vw; color: rgba(255,255,255,.026); font-family: var(--display); font-size: 14vw; line-height: .72; letter-spacing: -.05em; white-space: nowrap; }
 #isg-petrol-home .story-nav { position: absolute; z-index: 12; left: 50%; top: 34px; transform: translateX(-50%); display: grid; grid-template-columns: 72px 1fr auto; gap: 24px; align-items: center; }
 #isg-petrol-home .story-counter { color: rgba(255,255,255,.54); font-family: var(--display); font-size: 13px; letter-spacing: .1em; }
 #isg-petrol-home .story-track { position: relative; height: 1px; overflow: hidden; background: rgba(255,255,255,.19); }
 #isg-petrol-home .story-track i { position: absolute; inset: 0 auto 0 0; display: block; background: var(--orange); box-shadow: 0 0 18px rgba(241,90,36,.8); transition: width .08s linear; }
 #isg-petrol-home .story-steps { display: flex; gap: 4px; }
 #isg-petrol-home .story-steps button { position: relative; min-width: 48px; height: 36px; padding: 0 10px; border: 0; background: transparent; color: rgba(255,255,255,.38); font-family: var(--display); font-size: 12px; letter-spacing: .08em; cursor: pointer; transition: color .3s, background .3s; }
 #isg-petrol-home .story-steps button:after { content: ""; position: absolute; left: 12px; right: 12px; bottom: 1px; height: 2px; background: transparent; }
 #isg-petrol-home .story-steps button.active { background: rgba(255,255,255,.06); color: white; } #isg-petrol-home .story-steps button.active:after { background: var(--orange); }
 #isg-petrol-home .story-copy { position: absolute; z-index: 10; left: 50%; top: 50%; height: 520px; transform: translate(-50%,-50%); pointer-events: none; }
 #isg-petrol-home .story-copy article { position: absolute; left: 0; top: 50%; width: min(410px,32vw); transform: translateY(-50%); will-change: transform,opacity; transition: opacity .08s linear; }
 #isg-petrol-home .story-kicker { display: flex; align-items: center; gap: 14px; margin-bottom: 22px; color: rgba(255,255,255,.52); font-size: 10px; font-weight: 900; letter-spacing: .15em; text-transform: uppercase; }
 #isg-petrol-home .story-kicker span { display: grid; place-items: center; width: 42px; height: 42px; border: 1px solid rgba(255,255,255,.22); color: var(--orange); font-family: var(--display); font-size: 14px; }
 #isg-petrol-home .story-copy h2 { margin: 0; font-size: clamp(82px,8.5vw,142px); line-height: .72; white-space: nowrap; }
 #isg-petrol-home .story-copy strong { display: block; margin-top: 30px; color: var(--orange); font-family: var(--display); font-size: clamp(28px,3.2vw,50px); line-height: .85; text-transform: uppercase; }
 #isg-petrol-home .story-copy p { max-width: 360px; margin: 25px 0; color: rgba(255,255,255,.68); font-size: 15px; line-height: 1.55; }
 #isg-petrol-home .story-copy a { display: inline-flex; align-items: center; gap: 24px; padding-bottom: 8px; border-bottom: 2px solid var(--orange); font-size: 10px; font-weight: 900; letter-spacing: .1em; text-transform: uppercase; pointer-events: auto; }
 #isg-petrol-home .story-visual { position: absolute; z-index: 4; right: -3vw; top: 9vh; width: 73vw; height: 82vh; perspective: 1800px; }
 #isg-petrol-home .story-light { position: absolute; inset: 8% 3% 0 16%; background: radial-gradient(ellipse at center, rgba(113,157,172,.36), transparent 68%); filter: blur(22px); }
 #isg-petrol-home .story-visual img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; object-position: center; mix-blend-mode: screen; will-change: transform,opacity,filter; transition: opacity .08s linear, filter .08s linear; filter-origin: center; }
 #isg-petrol-home .story-spec { position: absolute; z-index: 10; left: 50%; bottom: 34px; transform: translateX(-50%); display: flex; justify-content: space-between; align-items: flex-end; pointer-events: none; }
 #isg-petrol-home .story-spec span { color: rgba(255,255,255,.36); font-size: 8px; font-weight: 900; letter-spacing: .18em; writing-mode: vertical-rl; transform: rotate(180deg); }
 #isg-petrol-home .story-spec b { color: rgba(255,255,255,.11); font-family: var(--display); font-size: clamp(52px,7vw,110px); line-height: .7; letter-spacing: -.03em; text-transform: uppercase; }

 #isg-petrol-home .section-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 70px; margin-bottom: 58px; }
 #isg-petrol-home .section-head > div { max-width: 850px; }
 #isg-petrol-home .section-head > p { max-width: 370px; margin: 0; color: var(--muted); }
 #isg-petrol-home .family-tabs { display: grid; grid-template-columns: repeat(4, 1fr); border: 1px solid var(--line); }
 #isg-petrol-home .family-tabs button { min-height: 108px; padding: 20px 24px; border: 0; border-right: 1px solid var(--line); background: rgba(255,255,255,.3); color: var(--ink); cursor: pointer; text-align: left; transition: .25s; }
 #isg-petrol-home .family-tabs button:last-child { border-right: 0; }
 #isg-petrol-home .family-tabs button span,  #isg-petrol-home .family-tabs button b { display: block; font-family: var(--display); text-transform: uppercase; }
 #isg-petrol-home .family-tabs button span { font-size: 24px; } #isg-petrol-home .family-tabs button b { margin-top: 8px; color: var(--orange); font-size: 13px; letter-spacing: .07em; }
 #isg-petrol-home .family-tabs button.active { background: var(--orange); color: white; transform: translateY(-6px); box-shadow: 0 16px 35px rgba(241,90,36,.2); }
 #isg-petrol-home .family-tabs button.active b { color: white; }
 #isg-petrol-home .family-stage { min-height: 630px; display: grid; grid-template-columns: 1.15fr .85fr; background: white; border: 1px solid var(--line); border-top: 0; }
 #isg-petrol-home .family-visual { position: relative; overflow: hidden; background: var(--petrol); min-height: 620px; }
 #isg-petrol-home .family-visual:after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 60%, rgba(8,35,45,.72)); pointer-events: none; }
 #isg-petrol-home .family-visual img { width: 100%; height: 100%; object-fit: cover; animation: productIn .45s ease both; }
@keyframes productIn { from { opacity: 0; transform: scale(1.035); } }
 #isg-petrol-home .visual-index { position: absolute; z-index: 2; left: 30px; top: 24px; color: rgba(255,255,255,.16); font-family: var(--display); font-size: 100px; line-height: 1; }
 #isg-petrol-home .visual-range { position: absolute; z-index: 3; left: 30px; bottom: 26px; color: white; font-family: var(--display); font-size: 30px; letter-spacing: .03em; }
 #isg-petrol-home .family-copy { padding: 64px 58px; display: flex; flex-direction: column; justify-content: center; }
 #isg-petrol-home .family-copy h3 { max-width: 540px; margin: 24px 0; font-size: clamp(42px, 4vw, 64px); line-height: .94; }
 #isg-petrol-home .family-copy > p { color: var(--muted); font-size: 16px; }
 #isg-petrol-home .family-copy ul { display: grid; gap: 12px; list-style: none; padding: 0; margin: 20px 0 24px; }
 #isg-petrol-home .family-copy li { display: flex; align-items: center; gap: 12px; padding-bottom: 12px; border-bottom: 1px solid var(--line); font-size: 13px; font-weight: 700; }
 #isg-petrol-home .family-copy li span { color: var(--orange); }
 #isg-petrol-home .family-use { display: flex; flex-direction: column; gap: 6px; margin: 6px 0 24px; }
 #isg-petrol-home .family-use small { color: var(--steel); font-size: 9px; font-weight: 900; letter-spacing: .14em; } #isg-petrol-home .family-use b { font-size: 13px; }
 #isg-petrol-home .text-link { align-self: flex-start; display: flex; align-items: center; gap: 28px; padding-bottom: 7px; border-bottom: 2px solid var(--orange); font-size: 12px; font-weight: 900; text-transform: uppercase; }

 #isg-petrol-home .capacity { background: var(--orange); color: white; padding: 90px 0; }
 #isg-petrol-home .capacity-layout { display: grid; grid-template-columns: 1fr .62fr; gap: 90px; align-items: center; }
 #isg-petrol-home .capacity-copy h2 { max-width: 880px; font-size: clamp(50px, 5vw, 78px); }
 #isg-petrol-home .capacity-copy > p { max-width: 700px; color: rgba(255,255,255,.78); }
 #isg-petrol-home .capacity-copy label { display: block; margin-top: 32px; font-size: 10px; font-weight: 900; letter-spacing: .15em; text-transform: uppercase; }
 #isg-petrol-home .range-value { display: flex; align-items: baseline; gap: 10px; margin: 9px 0 16px; } #isg-petrol-home .range-value strong { font-family: var(--display); font-size: 55px; } #isg-petrol-home .range-value span { font-size: 14px; text-transform: uppercase; }
 #isg-petrol-home input[type="range"] { width: 100%; height: 6px; appearance: none; border-radius: 0; background: linear-gradient(90deg, white var(--progress), rgba(255,255,255,.28) var(--progress)); }
 #isg-petrol-home input[type="range"]::-webkit-slider-thumb { width: 26px; height: 26px; appearance: none; border: 7px solid white; border-radius: 50%; background: var(--petrol); cursor: grab; box-shadow: 0 3px 10px rgba(0,0,0,.18); }
 #isg-petrol-home .range-labels { display: flex; justify-content: space-between; margin-top: 12px; font-size: 10px; font-weight: 800; }
 #isg-petrol-home .capacity-result { padding: 42px; background: var(--petrol); min-height: 390px; display: flex; flex-direction: column; justify-content: center; box-shadow: 24px 24px 0 rgba(8,35,45,.15); }
 #isg-petrol-home .capacity-result > span { color: var(--metal); font-size: 9px; font-weight: 900; letter-spacing: .15em; } #isg-petrol-home .capacity-result strong { margin-top: 24px; font-family: var(--display); font-size: 58px; text-transform: uppercase; } #isg-petrol-home .capacity-result b { color: var(--orange); font-family: var(--display); font-size: 22px; } #isg-petrol-home .capacity-result p { color: rgba(255,255,255,.65); } #isg-petrol-home .capacity-result button { align-self: flex-start; padding: 0 0 8px; border: 0; border-bottom: 2px solid var(--orange); background: none; color: white; cursor: pointer; font-size: 11px; font-weight: 900; text-transform: uppercase; }

 #isg-petrol-home .cycle { position: relative; background: var(--petrol); color: white; }
 #isg-petrol-home .cycle:before { content: ""; position: absolute; inset: 0; opacity: .12; background-image: linear-gradient(rgba(255,255,255,.14) 1px, transparent 1px),linear-gradient(90deg,rgba(255,255,255,.14) 1px,transparent 1px); background-size: 78px 78px; }
 #isg-petrol-home .cycle .shell { position: relative; } #isg-petrol-home .inverse > p { color: rgba(255,255,255,.6); }
 #isg-petrol-home .process-grid { display: grid; grid-template-columns: repeat(4,1fr); border-top: 1px solid rgba(255,255,255,.2); border-left: 1px solid rgba(255,255,255,.2); }
 #isg-petrol-home .process-grid article { position: relative; min-height: 440px; padding: 36px 30px; border-right: 1px solid rgba(255,255,255,.2); border-bottom: 1px solid rgba(255,255,255,.2); transition: background .3s, transform .3s; }
 #isg-petrol-home .process-grid article:hover { background: var(--petrol-2); transform: translateY(-8px); } #isg-petrol-home .process-grid article > span { color: var(--orange); font-family: var(--display); font-size: 18px; }
 #isg-petrol-home .process-grid h3 { margin: 35px 0 14px; font-size: 32px; } #isg-petrol-home .process-grid p { color: rgba(255,255,255,.6); font-size: 14px; }
 #isg-petrol-home .process-icon { position: relative; width: 120px; height: 110px; margin: 38px 0 0; border: 1px solid rgba(156,169,173,.35); }
 #isg-petrol-home .process-icon:before,  #isg-petrol-home .process-icon:after,  #isg-petrol-home .process-icon i,  #isg-petrol-home .process-icon b { content: ""; position: absolute; display: block; border: 2px solid var(--metal); }
 #isg-petrol-home .process-icon:before { width: 52px; height: 52px; border-radius: 50%; left: 32px; top: 25px; } #isg-petrol-home .process-icon:after { width: 76px; height: 2px; border-width: 1px 0 0; left: 20px; top: 52px; } #isg-petrol-home .process-icon i { width: 2px; height: 76px; border-width: 0 0 0 1px; left: 59px; top: 15px; } #isg-petrol-home .process-icon b { width: 8px; height: 8px; background: var(--orange); border: 0; left: 56px; top: 49px; }
 #isg-petrol-home .icon-02:before { border-radius: 0; transform: rotate(45deg); } #isg-petrol-home .icon-03:after { transform: rotate(-35deg); transform-origin: left; } #isg-petrol-home .icon-04:before { border-style: dashed; }

 #isg-petrol-home .turnkey { background: white; } #isg-petrol-home .split { display: grid; grid-template-columns: 1.05fr .95fr; gap: 90px; align-items: center; }
 #isg-petrol-home .turnkey-image { position: relative; min-height: 720px; background: var(--petrol); } #isg-petrol-home .turnkey-image img { width: 100%; height: 100%; position: absolute; object-fit: cover; }
 #isg-petrol-home .image-note { position: absolute; left: 0; right: 15%; bottom: 0; padding: 24px 30px; display: flex; flex-direction: column; gap: 6px; background: var(--orange); color: white; } #isg-petrol-home .image-note span { font-size: 9px; font-weight: 900; letter-spacing: .14em; } #isg-petrol-home .image-note b { font-size: 13px; }
 #isg-petrol-home .turnkey-copy h2 { font-size: clamp(55px,5.3vw,84px); } #isg-petrol-home .turnkey-copy .lead { color: var(--orange); font-family: var(--display); font-size: 28px; line-height: 1.1; text-transform: uppercase; }
 #isg-petrol-home .deliverables { margin: 42px 0; } #isg-petrol-home .deliverables div { display: grid; grid-template-columns: 42px 1fr; gap: 16px; padding: 18px 0; border-top: 1px solid var(--line); } #isg-petrol-home .deliverables span { color: var(--orange); font-family: var(--display); } #isg-petrol-home .deliverables p { margin: 0; color: var(--muted); font-size: 14px; } #isg-petrol-home .deliverables b { color: var(--ink); }

 #isg-petrol-home .sectors { background: var(--paper); } #isg-petrol-home .sector-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
 #isg-petrol-home .sector-grid article { min-height: 250px; padding: 30px; position: relative; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); transition: .3s; } #isg-petrol-home .sector-grid article:hover { background: white; box-shadow: 0 20px 50px rgba(8,35,45,.08); transform: translateY(-4px); }
 #isg-petrol-home .sector-grid article > span { color: var(--orange); font-family: var(--display); font-size: 18px; } #isg-petrol-home .sector-grid h3 { margin: 45px 0 12px; font-size: 32px; } #isg-petrol-home .sector-grid p { max-width: 280px; color: var(--muted); font-size: 13px; } #isg-petrol-home .sector-grid article > span:last-child { position: absolute; right: 28px; top: 28px; color: var(--ink); }

 #isg-petrol-home .iso { background: #0a2934; color: white; } #isg-petrol-home .iso-grid { display: grid; grid-template-columns: .82fr 1.18fr; gap: 90px; align-items: center; } #isg-petrol-home .iso-copy h2 { font-size: clamp(52px,5vw,78px); } #isg-petrol-home .iso-copy > p { color: rgba(255,255,255,.62); font-size: 16px; } #isg-petrol-home .iso-points { display: flex; flex-wrap: wrap; gap: 10px; margin: 28px 0; } #isg-petrol-home .iso-points span { padding: 10px 12px; border: 1px solid rgba(255,255,255,.2); color: var(--metal); font-size: 9px; font-weight: 900; letter-spacing: .1em; }
 #isg-petrol-home .iso-images { position: relative; min-height: 650px; } #isg-petrol-home .iso-main { position: absolute; right: 0; top: 0; width: 85%; height: 76%; object-fit: cover; } #isg-petrol-home .iso-detail { position: absolute; left: 0; bottom: 0; width: 46%; height: 43%; object-fit: cover; border: 10px solid #0a2934; } #isg-petrol-home .iso-badge { position: absolute; right: 0; bottom: 5%; padding: 18px 22px; display: flex; gap: 12px; background: var(--orange); align-items: center; } #isg-petrol-home .iso-badge strong { font-family: var(--display); font-size: 24px; } #isg-petrol-home .iso-badge span { opacity: .6; }

 #isg-petrol-home .why { background: white; } #isg-petrol-home .why-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 90px; align-items: start; } #isg-petrol-home .why-grid h2 { font-size: clamp(48px,4.6vw,74px); } #isg-petrol-home .why-list { border-top: 1px solid var(--line); } #isg-petrol-home .why-list p { display: grid; grid-template-columns: 48px 190px 1fr; align-items: center; margin: 0; padding: 28px 0; border-bottom: 1px solid var(--line); } #isg-petrol-home .why-list span { color: var(--orange); font-family: var(--display); } #isg-petrol-home .why-list b { font-size: 13px; } #isg-petrol-home .why-list p { color: var(--muted); font-size: 13px; }

 #isg-petrol-home .contact { padding: 90px 0; background: var(--orange); color: white; } #isg-petrol-home .contact-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 90px; align-items: end; } #isg-petrol-home .contact h2 { font-size: clamp(54px,5.3vw,84px); } #isg-petrol-home .contact-grid > div:last-child > p { color: rgba(255,255,255,.8); } #isg-petrol-home .light-button { background: white; color: var(--petrol); } #isg-petrol-home .phone-link { align-self: center; padding-bottom: 8px; border-bottom: 1px solid white; font-size: 11px; font-weight: 900; text-transform: uppercase; }
 #isg-petrol-home .isg-home footer { background: #061a22; color: white; padding: 72px 0 24px; } #isg-petrol-home .footer-grid { display: grid; grid-template-columns: 1.8fr repeat(3,1fr); gap: 60px; } #isg-petrol-home .footer-grid > div { display: flex; flex-direction: column; gap: 11px; } #isg-petrol-home .footer-grid b { font-size: 12px; text-transform: uppercase; } #isg-petrol-home .footer-grid a,  #isg-petrol-home .footer-grid span { color: rgba(255,255,255,.5); font-size: 12px; } #isg-petrol-home .footer-brand { font-size: 28px; } #isg-petrol-home .footer-brand > b { font-family: var(--display); font-size: 34px; } #isg-petrol-home .footer-brand span { margin-top: 12px; } #isg-petrol-home .footer-bottom { display: flex; justify-content: space-between; margin-top: 52px; padding-top: 20px; border-top: 1px solid rgba(255,255,255,.12); color: rgba(255,255,255,.35); font-size: 9px; text-transform: uppercase; letter-spacing: .08em; }

 #isg-petrol-home [data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity .7s ease, transform .7s ease; }
 #isg-petrol-home [data-reveal].is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {  #isg-petrol-home *,  #isg-petrol-home *:before,  #isg-petrol-home *:after { scroll-behavior: auto !important; animation: none !important; transition: none !important; }  #isg-petrol-home [data-reveal] { opacity: 1; transform: none; } }

@media (max-width: 1100px) {
   #isg-petrol-home { --shell: min(100% - 40px, 960px); }
   #isg-petrol-home .hero { min-height: auto; } #isg-petrol-home .hero-layout { grid-template-columns: 1fr; padding: 90px 0 540px; } #isg-petrol-home .hero-copy { max-width: 720px; } #isg-petrol-home .hero-product { top: auto; right: -8%; bottom: 50px; width: 95%; height: 600px; } #isg-petrol-home .hero-proof { max-width: 600px; }
   #isg-petrol-home .family-stage { grid-template-columns: 1fr; } #isg-petrol-home .family-visual { min-height: 580px; } #isg-petrol-home .family-copy { padding: 55px 42px; }
   #isg-petrol-home .process-grid { grid-template-columns: repeat(2,1fr); } #isg-petrol-home .split,  #isg-petrol-home .iso-grid { gap: 50px; } #isg-petrol-home .why-grid { gap: 50px; } #isg-petrol-home .section { padding: 90px 0; }
   #isg-petrol-home .story-visual { right: -12vw; width: 82vw; } #isg-petrol-home .story-copy article { width: 38vw; } #isg-petrol-home .story-copy h2 { font-size: 94px; }
}

@media (max-width: 760px) {
   #isg-petrol-home { --shell: calc(100% - 28px); } #isg-petrol-home .section { padding: 72px 0; }
   #isg-petrol-home h2 { font-size: 48px; } #isg-petrol-home .hero-layout { padding: 68px 0 390px; } #isg-petrol-home .hero h1 { font-size: 64px; } #isg-petrol-home .hero h1 span { font-size: .58em; } #isg-petrol-home .hero-copy > p { font-size: 15px; } #isg-petrol-home .hero-product { width: 125%; right: -24%; height: 440px; bottom: 35px; } #isg-petrol-home .tech-tag,  #isg-petrol-home .capacity-stamp { display: none; } #isg-petrol-home .hero-proof { gap: 8px; } #isg-petrol-home .hero-proof b { font-size: 22px; } #isg-petrol-home .hero-proof span { font-size: 8px; } #isg-petrol-home .trust-row { grid-template-columns: 1fr 1fr; padding: 14px 0; } #isg-petrol-home .trust-row span { min-height: 36px; display: grid; place-items: center; font-size: 8px; }
   #isg-petrol-home .product-story { height: 440vh; } #isg-petrol-home .story-sticky { min-height: 620px; } #isg-petrol-home .story-sticky:after { background: linear-gradient(0deg,rgba(6,26,34,.98) 0%,rgba(6,26,34,.7) 39%,transparent 68%),linear-gradient(180deg,rgba(6,26,34,.74),transparent 24%); } #isg-petrol-home .story-nav { top: 20px; grid-template-columns: 54px 1fr; gap: 14px; } #isg-petrol-home .story-steps { grid-column: 1 / -1; justify-content: space-between; } #isg-petrol-home .story-steps button { min-width: 54px; } #isg-petrol-home .story-copy { top: auto; bottom: 52px; height: 310px; } #isg-petrol-home .story-copy article { top: auto; bottom: 0; width: calc(100% - 28px); } #isg-petrol-home .story-copy h2 { font-size: 74px; } #isg-petrol-home .story-copy strong { margin-top: 18px; font-size: 32px; } #isg-petrol-home .story-copy p { max-width: 340px; margin: 14px 0; font-size: 13px; } #isg-petrol-home .story-visual { right: -22vw; top: 7vh; width: 132vw; height: 61vh; } #isg-petrol-home .story-spec { bottom: 26px; } #isg-petrol-home .story-spec b { display: none; } #isg-petrol-home .story-word { font-size: 24vw; bottom: 34%; } #isg-petrol-home .orbit-one { width: 130vw; height: 130vw; right: -64vw; } #isg-petrol-home .orbit-two { width: 90vw; height: 90vw; right: -37vw; }
   #isg-petrol-home .section-head { display: block; margin-bottom: 38px; } #isg-petrol-home .section-head > p { margin-top: 22px; } #isg-petrol-home .family-tabs { grid-template-columns: 1fr 1fr; } #isg-petrol-home .family-tabs button { min-height: 90px; border-bottom: 1px solid var(--line); } #isg-petrol-home .family-tabs button:nth-child(2) { border-right: 0; } #isg-petrol-home .family-tabs button.active { transform: none; } #isg-petrol-home .family-visual { min-height: 380px; } #isg-petrol-home .visual-index { font-size: 64px; } #isg-petrol-home .family-copy { padding: 42px 25px; } #isg-petrol-home .family-copy h3 { font-size: 43px; }
   #isg-petrol-home .capacity-layout,  #isg-petrol-home .split,  #isg-petrol-home .iso-grid,  #isg-petrol-home .why-grid,  #isg-petrol-home .contact-grid { grid-template-columns: 1fr; gap: 52px; } #isg-petrol-home .capacity-result { min-height: 330px; padding: 30px; } #isg-petrol-home .process-grid { grid-template-columns: 1fr; } #isg-petrol-home .process-grid article { min-height: 370px; } #isg-petrol-home .turnkey-image { min-height: 480px; order: 2; } #isg-petrol-home .sector-grid { grid-template-columns: 1fr 1fr; } #isg-petrol-home .sector-grid article { min-height: 230px; padding: 24px; } #isg-petrol-home .sector-grid h3 { font-size: 26px; } #isg-petrol-home .iso-images { min-height: 500px; } #isg-petrol-home .why-list p { grid-template-columns: 38px 1fr; } #isg-petrol-home .why-list p b { grid-column: 2; } #isg-petrol-home .why-list p { font-size: 12px; } #isg-petrol-home .footer-grid { grid-template-columns: 1fr 1fr; } #isg-petrol-home .footer-brand { grid-column: 1 / -1; } #isg-petrol-home .footer-bottom { gap: 20px; }
}

@media (max-width: 470px) {
   #isg-petrol-home .hero h1 { font-size: 54px; } #isg-petrol-home .button { width: 100%; } #isg-petrol-home .hero-proof { grid-template-columns: 1fr 1fr 1fr; } #isg-petrol-home .story-copy h2 { font-size: 62px; } #isg-petrol-home .story-copy strong { font-size: 28px; } #isg-petrol-home .story-copy p { max-width: 310px; } #isg-petrol-home .story-kicker { font-size: 8px; } #isg-petrol-home .story-visual { top: 8vh; right: -30vw; width: 150vw; height: 55vh; } #isg-petrol-home .family-tabs button { padding: 16px; } #isg-petrol-home .family-tabs button span { font-size: 20px; } #isg-petrol-home .family-visual { min-height: 310px; } #isg-petrol-home .family-visual img { object-position: center; } #isg-petrol-home .sector-grid { grid-template-columns: 1fr; } #isg-petrol-home .iso-images { min-height: 390px; } #isg-petrol-home .footer-grid { grid-template-columns: 1fr; } #isg-petrol-home .footer-brand { grid-column: auto; } #isg-petrol-home .footer-bottom { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
   #isg-petrol-home .product-story { height: 100vh; } #isg-petrol-home .story-visual img:not([aria-hidden="false"]) { display: none; } #isg-petrol-home .story-copy article:not([aria-hidden="false"]) { display: none; }
}