:root{
  --navy:#0b1826;
  --navy2:#102338;
  --steel:#1a3350;
  --ink:#1c2733;
  --body:#42525f;
  --muted:#7b8a96;
  --line:#dde4ea;
  --bg:#f6f8fa;
  --white:#ffffff;
  --flame:#e8641b;
  --flame-dk:#c94f0e;
  --amber:#f2a33c;
  --mono:'IBM Plex Mono',monospace;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:'Inter',-apple-system,sans-serif;color:var(--body);background:var(--white);line-height:1.65;font-size:16px}
h1,h2,h3,h4{color:var(--ink);line-height:1.2;font-weight:700}
.wrap{max-width:1120px;margin:0 auto;padding:0 24px}
.eyebrow{font-family:var(--mono);font-size:.78rem;letter-spacing:.14em;text-transform:uppercase;color:var(--flame);font-weight:500;margin-bottom:14px}
section{padding:88px 0}
.lead{font-size:1.15rem;max-width:760px}
.h2{font-size:1.9rem;margin-bottom:18px}

/* Nav */
nav{position:sticky;top:0;z-index:100;background:rgba(11,24,38,.96);backdrop-filter:blur(8px);border-bottom:1px solid rgba(255,255,255,.07)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:68px}
.logo{display:flex;align-items:center;gap:11px;text-decoration:none}
.logo svg{width:40px;height:40px;flex:none}
.logo .wordmark{font-weight:700;font-size:1.04rem;color:#fff;letter-spacing:.09em;line-height:1.1}
.logo .wordmark b{color:var(--flame);font-weight:700}
.logo .tagline{display:block;font-family:var(--mono);font-size:.54rem;font-weight:400;color:#8496a6;letter-spacing:.2em;text-transform:uppercase;margin-top:3px}
.nav-links{display:flex;gap:26px;align-items:center}
.nav-links a{color:#c3ceda;text-decoration:none;font-size:.9rem;font-weight:500;transition:color .15s}
.nav-links a:hover{color:#fff}
.nav-cta{background:var(--flame);color:#fff !important;padding:9px 18px;border-radius:6px;font-weight:600}
.nav-cta:hover{background:var(--flame-dk)}
.nav-links .dd{position:relative}
.nav-links .dd>a::after{content:" ▾";font-size:.7em}
.dd-menu{display:none;position:absolute;top:calc(100% + 10px);left:-16px;background:var(--navy2);border:1px solid rgba(255,255,255,.1);border-radius:8px;padding:8px;min-width:250px;box-shadow:0 12px 32px rgba(0,0,0,.4)}
.dd:hover .dd-menu,.dd:focus-within .dd-menu{display:block}
.dd-menu::before{content:"";position:absolute;top:-12px;left:0;right:0;height:12px}
.dd-menu a{display:block;padding:9px 14px;border-radius:6px;font-size:.87rem}
.dd-menu a:hover{background:rgba(255,255,255,.06)}
@media(max-width:900px){.nav-links a:not(.nav-cta){display:none}.nav-links .dd{display:none}}

/* Buttons */
.btn{display:inline-block;padding:14px 28px;border-radius:6px;font-weight:600;text-decoration:none;font-size:.98rem;transition:all .15s}
.btn-primary{background:var(--flame);color:#fff}
.btn-primary:hover{background:var(--flame-dk)}
.btn-ghost{border:1px solid rgba(255,255,255,.3);color:#fff;margin-left:12px}
.btn-ghost:hover{border-color:#fff;background:rgba(255,255,255,.06)}

/* Home hero */
.hero{background:linear-gradient(96deg,rgba(9,20,33,.96) 0%,rgba(9,20,33,.88) 34%,rgba(11,24,38,.62) 62%,rgba(13,28,46,.34) 100%),url('/assets/hero-wellsite.jpg') center 68%/cover no-repeat;color:#fff;padding:130px 0 110px;position:relative;overflow:hidden}
.hero::after{content:"";position:absolute;left:0;right:0;bottom:0;height:120px;background:linear-gradient(to bottom,transparent,rgba(11,24,38,.85))}
.hero .wrap{position:relative;z-index:1}
.hero h1{color:#fff;font-size:clamp(2.1rem,4.6vw,3.4rem);font-weight:800;letter-spacing:-.02em;max-width:820px;margin-bottom:22px}
.hero h1 em{font-style:normal;color:var(--amber)}
.hero p{color:#b9c6d3;font-size:1.2rem;max-width:700px;margin-bottom:36px}

/* Hero slider */
.hero-slider{position:relative;overflow:hidden;color:#fff}
.hs-slide{position:absolute;inset:0;opacity:0;transition:opacity .9s ease;display:flex;align-items:center;background-size:cover;background-position:center;pointer-events:none}
.hs-slide.active{opacity:1;position:relative;pointer-events:auto}
.hs-slide .wrap{position:relative;z-index:1;width:100%;padding-top:118px;padding-bottom:128px}
.hs-slide h1,.hs-slide h2.hs-title{color:#fff;font-size:clamp(2rem,4.2vw,3.15rem);font-weight:800;letter-spacing:-.02em;max-width:840px;margin-bottom:20px}
.hs-slide h1 em,.hs-slide h2.hs-title em{font-style:normal;color:var(--amber)}
.hs-slide p{color:#c3cfdb;font-size:1.16rem;max-width:700px;margin-bottom:34px}
.hs-dots{position:absolute;bottom:26px;left:0;right:0;display:flex;gap:10px;justify-content:center;z-index:6}
.hs-dots button{width:10px;height:10px;border-radius:99px;border:none;background:rgba(255,255,255,.35);cursor:pointer;padding:0;transition:all .25s}
.hs-dots button.on{background:var(--amber);width:28px}
.hs-arrow{position:absolute;top:50%;transform:translateY(-50%);z-index:6;background:rgba(11,24,38,.55);border:1px solid rgba(255,255,255,.28);color:#fff;width:44px;height:44px;border-radius:50%;cursor:pointer;font-size:1.05rem;line-height:1;transition:all .15s}
.hs-arrow:hover{background:var(--flame);border-color:var(--flame)}
.hs-prev{left:18px}
.hs-next{right:18px}
@media(max-width:700px){.hs-arrow{display:none}}

/* Page hero (subpages) */
.page-hero{background:linear-gradient(160deg,var(--navy) 0%,var(--navy2) 60%,var(--steel) 100%);color:#fff;padding:84px 0 64px;position:relative;overflow:hidden}
.page-hero::after{content:"";position:absolute;right:-200px;top:-160px;width:560px;height:560px;border-radius:50%;background:radial-gradient(circle,rgba(232,100,27,.14) 0%,transparent 65%)}
.page-hero .wrap{position:relative;z-index:1}
.page-hero .crumb{font-family:var(--mono);font-size:.78rem;color:#7b8a96;margin-bottom:18px}
.page-hero .crumb a{color:#93a4b4;text-decoration:none}
.page-hero .crumb a:hover{color:#fff}
.page-hero h1{color:#fff;font-size:clamp(1.9rem,4vw,2.8rem);font-weight:800;letter-spacing:-.02em;max-width:840px;margin-bottom:18px}
.page-hero p{color:#b9c6d3;font-size:1.12rem;max-width:760px}

/* Stat bar */
.stats{background:var(--navy);border-top:1px solid rgba(255,255,255,.08);padding:36px 0;color:#fff}
.stats .wrap{display:grid;grid-template-columns:repeat(4,1fr);gap:28px}
.stat h3{font-family:var(--mono);color:var(--amber);font-size:1.7rem;font-weight:500;margin-bottom:4px}
.stat p{color:#93a4b4;font-size:.86rem;line-height:1.45}
@media(max-width:820px){.stats .wrap{grid-template-columns:repeat(2,1fr)}}

/* Card grids */
.sci-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:44px}
.sci-card{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:28px}
.sci-card h3{font-size:1.02rem;margin-bottom:10px}
.sci-card p{font-size:.92rem}
.sci-card .sym{font-family:var(--mono);color:var(--flame);font-size:.82rem;display:block;margin-bottom:12px}
@media(max-width:820px){.sci-grid{grid-template-columns:1fr}}

/* Dark band + compare */
.band{background:var(--navy2);color:#fff}
.band h2{color:#fff}
.band .lead{color:#b9c6d3}
.compare{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-top:44px}
.comp-card{border-radius:10px;padding:32px}
.comp-generic{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.12)}
.comp-site{background:rgba(232,100,27,.1);border:1px solid rgba(232,100,27,.45)}
.comp-card h3{color:#fff;font-size:1.05rem;margin-bottom:14px}
.comp-card ul{list-style:none}
.comp-card li{padding:7px 0 7px 26px;position:relative;font-size:.93rem;color:#c3ceda}
.comp-generic li::before{content:"—";position:absolute;left:0;color:#66788a}
.comp-site li::before{content:"✓";position:absolute;left:0;color:var(--amber);font-weight:700}
@media(max-width:820px){.compare{grid-template-columns:1fr}}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;margin-top:44px}
.step{border:1px solid var(--line);border-radius:10px;padding:28px 24px;background:#fff;position:relative}
.step .num{font-family:var(--mono);color:var(--flame);font-size:.8rem;font-weight:500;display:block;margin-bottom:14px}
.step h3{font-size:1rem;margin-bottom:10px}
.step p{font-size:.89rem}
@media(max-width:900px){.steps{grid-template-columns:repeat(2,1fr)}}
@media(max-width:560px){.steps{grid-template-columns:1fr}}
.model-line{margin-top:44px;background:var(--navy);border-radius:10px;padding:28px 32px;overflow-x:auto}
.model-line code{font-family:var(--mono);font-size:.88rem;color:#d9e4ee;white-space:nowrap}
.model-line code b{color:var(--amber);font-weight:500}

/* Industry cards (home) */
.ind-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;margin-top:44px}
.ind-card{display:block;border:1px solid var(--line);border-radius:10px;padding:28px;background:#fff;text-decoration:none;transition:all .18s;position:relative}
.ind-card:hover{border-color:var(--flame);box-shadow:0 8px 28px rgba(232,100,27,.12);transform:translateY(-2px)}
.ind-card h3{font-size:1.02rem;margin-bottom:10px}
.ind-card p{font-size:.89rem;color:var(--body)}
.ind-card .go{font-family:var(--mono);font-size:.78rem;color:var(--flame);margin-top:14px;display:block;font-weight:500}
.ind-card .tag{display:inline-block;font-family:var(--mono);font-size:.66rem;letter-spacing:.1em;text-transform:uppercase;background:var(--flame);color:#fff;padding:4px 10px;border-radius:99px;margin-bottom:14px;font-weight:500}
.ind-card .tag.alt{background:var(--steel)}
@media(max-width:820px){.ind-grid{grid-template-columns:1fr}}

/* Subpage prose sections */
.prose{max-width:820px}
.prose p{margin-bottom:18px;font-size:1rem}
.prose h2{font-size:1.55rem;margin:44px 0 16px}
.prose h2:first-child{margin-top:0}
.prose ul{margin:0 0 18px 22px}
.prose li{margin-bottom:8px;font-size:.98rem}
.prose strong{color:var(--ink)}
.prose code{font-family:var(--mono);font-size:.88em;background:var(--bg);border:1px solid var(--line);border-radius:4px;padding:1px 6px;color:var(--flame-dk)}

/* Term cards / glossary */
.term-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:40px}
.term{background:var(--bg);border:1px solid var(--line);border-left:3px solid var(--flame);border-radius:8px;padding:24px}
.term h3{font-size:.98rem;margin-bottom:8px}
.term h3 code{font-family:var(--mono);font-size:.85em;color:var(--flame-dk);font-weight:500}
.term p{font-size:.9rem}
@media(max-width:820px){.term-grid{grid-template-columns:1fr}}

/* Data tables */
.dtable{width:100%;border-collapse:collapse;margin-top:32px;font-size:.92rem;background:#fff;border:1px solid var(--line);border-radius:8px;overflow:hidden}
.dtable th{background:var(--navy);color:#fff;text-align:left;padding:13px 18px;font-weight:600;font-size:.85rem}
.dtable td{padding:12px 18px;border-bottom:1px solid var(--line);vertical-align:top}
.dtable tr:last-child td{border-bottom:none}
.dtable td.num{font-family:var(--mono);color:var(--flame-dk);white-space:nowrap}

/* Callout */
.callout{background:linear-gradient(135deg,#fdf3ec,#fbe8da);border:1px solid #f3d5bf;border-radius:10px;padding:30px 34px;margin:40px 0}
.callout h3{font-size:1.05rem;margin-bottom:10px}
.callout p{font-size:.95rem;margin:0}

/* Split layout */
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:52px;align-items:start}
@media(max-width:860px){.split{grid-template-columns:1fr}}
.side-panel{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:30px;position:sticky;top:92px}
.side-panel h3{font-size:1rem;margin-bottom:16px}
.side-panel ul{list-style:none}
.side-panel li{padding:8px 0 8px 26px;position:relative;font-size:.92rem;border-bottom:1px solid #eef2f5}
.side-panel li:last-child{border:none}
.side-panel li::before{content:"▸";position:absolute;left:2px;color:var(--flame)}

/* Markets (home) */
.market-lead{background:linear-gradient(135deg,#fdf3ec,#fbe8da);border:1px solid #f3d5bf;border-radius:12px;padding:40px;margin-top:44px;display:grid;grid-template-columns:1.2fr .8fr;gap:36px;align-items:center}
.market-lead h3{font-size:1.35rem;margin-bottom:12px}
.market-lead p{font-size:.97rem}
.market-lead .badge{display:inline-block;font-family:var(--mono);font-size:.72rem;letter-spacing:.12em;text-transform:uppercase;background:var(--flame);color:#fff;padding:5px 12px;border-radius:99px;margin-bottom:16px;font-weight:500}
.gain-table{background:#fff;border:1px solid #f3d5bf;border-radius:8px;overflow:hidden;font-size:.85rem}
.gain-table div{display:flex;justify-content:space-between;padding:11px 16px;border-bottom:1px solid #f6e5d6}
.gain-table div:last-child{border-bottom:none}
.gain-table span:last-child{font-family:var(--mono);color:var(--flame-dk);font-weight:500}
@media(max-width:820px){.market-lead{grid-template-columns:1fr}}

/* Economics */
.econ{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;margin-top:20px}
.econ-math{background:var(--bg);border:1px solid var(--line);border-radius:10px;padding:34px;font-family:var(--mono);font-size:.9rem;color:var(--ink)}
.econ-math .row{display:flex;justify-content:space-between;padding:10px 0;border-bottom:1px dashed var(--line)}
.econ-math .row:last-child{border:none;color:var(--flame-dk);font-weight:500}
@media(max-width:820px){.econ{grid-template-columns:1fr}}

/* About */
.about{background:var(--bg)}
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:56px;align-items:start}
.about-grid p{margin-bottom:16px;font-size:.98rem}
.cred{background:#fff;border:1px solid var(--line);border-radius:10px;padding:30px}
.cred h3{font-size:1rem;margin-bottom:16px}
.cred ul{list-style:none}
.cred li{padding:8px 0 8px 26px;position:relative;font-size:.92rem;border-bottom:1px solid var(--bg)}
.cred li:last-child{border:none}
.cred li::before{content:"▸";position:absolute;left:2px;color:var(--flame)}
@media(max-width:820px){.about-grid{grid-template-columns:1fr}}

/* Contact */
.contact{background:var(--navy);color:#fff;text-align:center}
.contact h2{color:#fff}
.contact p{color:#b9c6d3;max-width:620px;margin:0 auto 34px}
.contact a.mail{font-family:var(--mono);color:var(--amber);font-size:1.1rem;text-decoration:none}
.contact a.mail:hover{text-decoration:underline}

/* CTA band on subpages */
.cta-band{background:var(--navy);color:#fff;padding:64px 0;text-align:center}
.cta-band h2{color:#fff;font-size:1.6rem;margin-bottom:14px}
.cta-band p{color:#b9c6d3;max-width:600px;margin:0 auto 28px}

/* Next-industry links */
.next-ind{background:var(--bg);padding:56px 0}
.next-ind h2{font-size:1.2rem;margin-bottom:26px}
.next-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.next-grid a{display:block;background:#fff;border:1px solid var(--line);border-radius:8px;padding:18px 20px;text-decoration:none;color:var(--ink);font-weight:600;font-size:.92rem;transition:all .15s}
.next-grid a span{display:block;font-family:var(--mono);font-size:.72rem;color:var(--flame);font-weight:500;margin-top:6px}
.next-grid a:hover{border-color:var(--flame)}
@media(max-width:820px){.next-grid{grid-template-columns:1fr}}

footer{background:#081220;color:#66788a;padding:40px 0 28px;font-size:.83rem}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:36px;margin-bottom:28px}
.foot-grid h4{color:#b9c6d3;font-size:.8rem;text-transform:uppercase;letter-spacing:.1em;margin-bottom:12px}
.foot-grid a{display:block;color:#93a4b4;text-decoration:none;padding:3px 0;font-size:.85rem}
.foot-grid a:hover{color:#fff}
.foot-grid p{font-size:.85rem;max-width:320px}
.foot-bottom{border-top:1px solid rgba(255,255,255,.07);padding-top:20px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
.foot-bottom a{color:#93a4b4;text-decoration:none}
@media(max-width:820px){.foot-grid{grid-template-columns:1fr}}