:root {
  --orange: #FE5C00;
  --black: #000000;
  --paper: #f5f5f1;
  --muted: #b4b4b0;
  --line: #323232;
  font-family: 'DM Sans', Arial, sans-serif;
  color: var(--paper);
  background: var(--black);
  font-synthesis: none;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 28px; }
body { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
a, button { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, [tabindex]:focus-visible { outline: 2px solid var(--orange); outline-offset: 5px; }
[hidden] { display: none !important; }
.skip { position: fixed; top: -80px; left: 20px; z-index: 99; padding: 15px; background: var(--orange); color: black; }
.skip:focus { top: 10px; }
.header { height: 96px; display: flex; align-items: center; justify-content: space-between; gap: 30px; padding: 0 4.4%; position: relative; z-index: 5; }
.brand { font-size: 48px; font-weight: 700; letter-spacing: -4px; display: inline-flex; align-items: baseline; line-height: 1; }
.brand-dot { color: var(--orange); }
.brand-energy { font-size: 12px; font-weight: 500; letter-spacing: 2px; align-self: center; margin: 8px 0 0 16px; }
.header nav { display: flex; align-items: center; gap: 32px; font-size: 14px; }
.header nav a:hover, .back-top:hover { color: var(--orange); }
.menu-toggle { display: none; color: white; background: transparent; border: 1px solid #777; padding: 11px 15px; cursor: pointer; }
.mobile-nav { position: absolute; z-index: 10; background: #0c0c0c; left: 0; right: 0; padding: 15px 6% 25px; border-top: 1px solid #333; }
.mobile-nav a { display: block; padding: 14px 0; }
.hero { position: relative; min-height: 650px; background: #222; isolation: isolate; }
.hero-image { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center 55%; z-index: -2; }
.hero-shade { position: absolute; inset: 0; z-index: -1; background: linear-gradient(90deg,rgba(0,0,0,.78),rgba(0,0,0,.3)),linear-gradient(0deg,rgba(0,0,0,.45),transparent 60%); }
.hero-content { padding: 74px 4.4% 112px; max-width: 1600px; margin: auto; }
.eyebrow { font-size: 12px; font-weight: 500; letter-spacing: 1.65px; line-height: 1.6; margin: 0 0 26px; }
.approach .eyebrow, .applications .eyebrow, .development .eyebrow { color: var(--orange); }
.hero h1 { font-family: 'Barlow Condensed', 'Arial Narrow', Impact, sans-serif; font-size: clamp(76px,9.1vw,140px); line-height: .98; letter-spacing: -1.5px; font-weight: 600; margin: 0; }
.hero h1 > span { display: block; color: var(--orange); }
.keep-together { white-space: nowrap; }
.hero-bottom { display: flex; align-items: center; gap: 60px; margin-top: 40px; }
.hero-bottom p { max-width: 590px; font-size: 20px; line-height: 1.6; margin: 0; }
.button { display: inline-flex; flex-shrink: 0; align-items: center; justify-content: center; padding: 18px 26px; border-radius: 3px; font-size: 14px; font-weight: 600; transition: background .2s, transform .2s; }
.button:hover { transform: translateY(-2px); }
.orange { background: var(--orange); color: black; }
.orange:hover { background: #ff762b; }
.section { padding: 96px 4.4%; max-width: 1600px; margin: 0 auto; }
.section-heading { margin-bottom: 44px; }
h2 { font-weight: 500; font-size: clamp(38px,4vw,60px); line-height: 1.1; letter-spacing: -1.8px; margin: 0; }
p { font-size: 16px; line-height: 1.7; }
.method-grid, .application-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 40px; }
.method-grid article { border-top: 2px solid var(--orange); padding-top: 23px; }
.method-grid h3 { font-size: 20px; line-height: 1.35; font-weight: 500; margin: 0 0 13px; letter-spacing: -.3px; }
.method-grid p, .application-grid p { color: var(--muted); margin: 0; }
.applications { background: #121212; }
.application-grid { padding-top: 30px; border-top: 1px solid #383838; }
.application-grid h3 { font-size: 27px; line-height: 1.2; font-weight: 500; letter-spacing: -.7px; margin: 0 0 17px; }
.technology { background: var(--paper); color: black; }
.tech-tabs { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); border-bottom: 1px solid #bdbdb5; margin-bottom: 42px; }
.tech-tabs button { min-width: 0; border: 0; background: transparent; padding: 23px 14px; text-align: center; color: #57574f; font-size: 17px; line-height: 1.4; border-bottom: 3px solid transparent; cursor: pointer; }
.tech-tabs button[aria-selected=true] { border-bottom-color: var(--orange); color: black; background: #e7e7e0; }
.tech-tabs button:hover { background: #ebebe6; }
.tech-tabs button:focus-visible { outline-color: black; outline-offset: -5px; }
.tech-panel { display: grid; grid-template-columns: .7fr 1.3fr; gap: 6%; align-items: center; }
.tech-information { max-width: 390px; }
.tech-information h3 { font-size: 33px; letter-spacing: -1px; font-weight: 500; line-height: 1.2; margin: 0 0 19px; }
.tech-information p { color: #55554c; margin: 0 0 25px; }
.tech-information dl { margin: 0; border-left: 2px solid var(--orange); padding-left: 15px; }
.tech-information dt { font-size: 12px; font-weight: 600; letter-spacing: 1px; margin-bottom: 6px; }
.tech-information dd { font-size: 14px; line-height: 1.6; margin: 0; color: #55554c; }
.diagram { margin: 0; min-width: 0; }
.diagram h4 { font-size: 15px; font-weight: 500; line-height: 1.4; margin: 0 0 8px; color: #55554c; }
.diagram-artwork { aspect-ratio: 3/2; width: 100%; overflow: hidden; }
.geothermal-illustration { display: block; width: 100%; height: auto; mix-blend-mode: darken; }
.diagram-caption { display: flex; flex-wrap: wrap; align-items: center; gap: 12px 20px; padding: 12px 0 0; }
.diagram-legend { display: flex; flex-wrap: wrap; gap: 10px 20px; font-size: 12px; color: #55554c; }
.diagram-legend > span { display: flex; align-items: center; gap: 8px; }
.diagram-legend i { width: 7px; height: 7px; border-radius: 50%; display: block; }
.legend-cool { background: #737c7d; }
.legend-hot { background: var(--orange); }
.diagram-scale { font-size: 12px; line-height: 1.5; color: #66665c; }
.storage-stages { display: grid; grid-template-columns: repeat(3,1fr); text-align: center; font-size: 13px; font-weight: 500; margin: -15% 0 30px; position: relative; }
.development h2 { max-width: 800px; text-wrap: balance; }
.development-path { display: grid; grid-template-columns: repeat(5,minmax(0,1fr)); gap: 0; list-style: none; padding: 0; margin: 0; }
.development-path li { position: relative; border-top: 1px solid #555; padding: 28px 26px 0 0; }
.development-path li::before { content: ''; width: 8px; height: 8px; border-radius: 50%; background: var(--orange); position: absolute; top: -4px; left: 0; }
.development-path li:last-child { padding-right: 0; }
.development-path h3 { font-size: 22px; font-weight: 500; margin: 0 0 12px; }
.development-path p { font-size: 14px; color: var(--muted); margin: 0; }
.development-note { color: var(--muted); font-size: 14px; margin: 36px 0 0; max-width: 660px; }
.closing { background: var(--orange); color: black; padding: 60px 4.4%; display: flex; align-items: flex-end; justify-content: space-between; gap: 30px; }
.closing h2 { font-family: 'Barlow Condensed','Arial Narrow',Impact,sans-serif; font-size: clamp(58px,7.5vw,112px); font-weight: 600; line-height: .98; letter-spacing: -1px; }
.black-button { background: black; color: var(--paper); }
.black-button:hover { background: #242424; }
.black-button:focus-visible { outline-color: black; }
footer { display: flex; align-items: center; gap: 40px; padding: 42px 4.4%; }
footer > span { color: var(--muted); font-size: 12px; margin-left: auto; }
.back-top { font-size: 13px; padding: 10px 0; border-bottom: 1px solid #777; }
@media(max-width:1000px) {
  .header nav { gap: 22px; }
  .method-grid, .application-grid { gap: 28px; }
  .tech-tabs button { font-size: 15px; }
  .hero-bottom { gap: 35px; }
}
@media(max-width:800px) {
  .header { height: 80px; padding: 0 6%; }
  .header nav { display: none; }
  .brand { font-size: 42px; }
  .brand-energy { margin-left: 12px; }
  .menu-toggle { display: block; font-size: 14px; }
  .hero { min-height: 650px; }
  .hero-content { padding: 62px 6% 80px; }
  .hero h1 { font-size: clamp(58px,11.8vw,94px); letter-spacing: -1px; }
  .hero .eyebrow { letter-spacing: 1.1px; max-width: 300px; }
  .hero-bottom { display: block; margin-top: 30px; }
  .hero-bottom p { font-size: 18px; max-width: 470px; }
  .hero-bottom .button { margin-top: 27px; }
  .hero-shade { background: linear-gradient(90deg,rgba(0,0,0,.76),rgba(0,0,0,.4)); }
  .hero-image { object-position: 50% center; }
  .section { padding: 66px 6%; }
  .section-heading { margin-bottom: 34px; }
  h2 { font-size: clamp(35px,6vw,46px); letter-spacing: -1.3px; }
  .method-grid, .application-grid { grid-template-columns: 1fr; gap: 28px; }
  .method-grid article { padding-top: 20px; }
  .application-grid article + article { border-top: 1px solid #383838; padding-top: 28px; }
  .application-grid h3 { font-size: 25px; margin-bottom: 12px; }
  .tech-tabs { grid-template-columns: repeat(2,minmax(0,1fr)); margin-bottom: 32px; }
  .tech-tabs button { padding: 16px 10px; min-height: 76px; }
  .tech-panel { grid-template-columns: 1fr; gap: 30px; }
  .tech-information { max-width: 540px; }
  .tech-information h3 { font-size: 29px; }
  .tech-information p { margin-bottom: 20px; }
  .diagram { width: 100%; max-width: 680px; margin: 0 auto; }
  .diagram h4 { font-size: 14px; }
  .diagram-caption { gap: 10px 20px; padding-top: 8px; }
  .storage-stages { font-size: 12px; margin-bottom: 20px; }
  .development-path { grid-template-columns: 1fr; }
  .development-path li { border-top: 0; border-left: 1px solid #555; padding: 0 0 28px 26px; }
  .development-path li::before { left: -4px; top: 9px; }
  .development-path li:last-child { padding-bottom: 0; }
  .development-path h3 { font-size: 21px; margin-bottom: 6px; }
  .development-path p { max-width: 480px; }
  .development-note { margin-top: 30px; }
  .closing { padding: 48px 6%; display: block; }
  .closing h2 { font-size: clamp(50px,10vw,80px); }
  .black-button { margin-top: 30px; }
  footer { padding: 35px 6%; flex-wrap: wrap; gap: 28px; }
  footer > span { margin-left: 0; }
  .back-top { margin-left: auto; }
}
@media(max-width:380px) {
  .tech-tabs button { font-size: 14px; }
  .brand-energy { font-size: 11px; }
  .hero h1 { font-size: 56px; }
}
@media(prefers-reduced-motion:reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}