:root {
  --ink: #143c32;
  --ink-deep: #0b2922;
  --mint: #d9f2df;
  --mint-soft: #edf8ef;
  --lime: #c7ec88;
  --cream: #f7f4ec;
  --paper: #fffdf8;
  --orange: #f36e3d;
  --text: #253d36;
  --muted: #66756f;
  --line: #d9dfd8;
  --shadow: 0 24px 70px rgba(11, 41, 34, .12);
  --radius: 24px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--text); background: var(--paper); font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; line-height: 1.65; -webkit-font-smoothing: antialiased; }
a { color: inherit; }
img { max-width: 100%; }
.container { width: min(1160px, calc(100% - 40px)); margin-inline: auto; }
.narrow { max-width: 820px; }
.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; }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 100; padding: 10px 16px; background: white; color: var(--ink); transform: translateY(-150%); }
.skip-link:focus { transform: none; }

.site-header { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid rgba(20,60,50,.1); background: rgba(255,253,248,.94); backdrop-filter: blur(14px); }
.nav-shell { min-height: 82px; display: flex; align-items: center; justify-content: space-between; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 11px; color: var(--ink); text-decoration: none; font-size: 13px; line-height: 1.05; letter-spacing: -.02em; }
.brand strong { font-size: 17px; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 42px; border-radius: 13px 13px 13px 4px; color: var(--ink-deep); background: var(--lime); font-size: 13px; font-weight: 900; letter-spacing: -.08em; }
.main-nav { display: flex; align-items: center; gap: 2px; }
.main-nav a { padding: 10px 11px; border-radius: 10px; color: #355249; text-decoration: none; font-size: 13px; font-weight: 650; }
.main-nav a:hover, .main-nav a.is-active { color: var(--ink-deep); background: var(--mint-soft); }
.menu-button { display: none; width: 44px; height: 44px; border: 0; border-radius: 12px; background: var(--mint-soft); cursor: pointer; }
.menu-button span:not(.sr-only) { display: block; width: 20px; height: 2px; margin: 4px auto; background: var(--ink); }

.hero { position: relative; overflow: hidden; padding: 96px 0 84px; background: var(--cream); }
.hero::before { content: ""; position: absolute; inset: 0; opacity: .24; background-image: linear-gradient(rgba(20,60,50,.09) 1px, transparent 1px), linear-gradient(90deg, rgba(20,60,50,.09) 1px, transparent 1px); background-size: 44px 44px; mask-image: linear-gradient(to right, transparent 8%, black 60%); }
.hero-grid { position: relative; display: grid; grid-template-columns: 1.08fr .92fr; align-items: center; gap: 80px; }
.eyebrow { margin: 0 0 14px; color: #497064; font-size: 12px; font-weight: 850; letter-spacing: .14em; text-transform: uppercase; }
.eyebrow.light { color: var(--lime); }
h1, h2, h3 { color: var(--ink-deep); line-height: 1.05; letter-spacing: -.05em; }
h1 { max-width: 760px; margin: 0 0 24px; font-family: Georgia, "Times New Roman", serif; font-size: clamp(52px, 6.5vw, 86px); font-weight: 500; }
h1 em { color: var(--orange); font-weight: 500; }
h2 { margin: 0 0 20px; font-size: clamp(34px, 4vw, 54px); }
h3 { margin: 0 0 8px; font-size: 24px; }
p { margin: 0 0 18px; }
.hero-lead { max-width: 640px; font-size: 20px; color: #465e56; }
.hero-actions { display: flex; align-items: center; gap: 24px; margin-top: 32px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 10px; min-height: 50px; padding: 12px 20px; border: 1px solid transparent; border-radius: 12px; text-decoration: none; font-weight: 800; transition: transform .2s ease, background .2s ease; }
.button:hover { transform: translateY(-2px); }
.button-primary { color: white; background: var(--ink); }
.button-primary:hover, .button-dark:hover { background: var(--ink-deep); }
.button-dark { color: white; background: var(--ink-deep); }
.button-light { color: var(--ink-deep); background: var(--lime); }
.text-link, .card-link { color: var(--ink); font-weight: 800; text-underline-offset: 4px; }
.trust-list { display: flex; flex-wrap: wrap; gap: 22px; padding: 0; margin: 32px 0 0; list-style: none; color: #5f726b; font-size: 13px; font-weight: 700; }
.trust-list li::before { content: "✓"; margin-right: 7px; color: var(--orange); font-weight: 900; }

.energy-card { padding: 28px; border: 1px solid rgba(20,60,50,.12); border-radius: 30px; background: var(--ink); color: white; box-shadow: var(--shadow); }
.energy-card-head { display: flex; justify-content: space-between; padding-bottom: 22px; border-bottom: 1px solid rgba(255,255,255,.16); color: #c9d7d2; font-size: 12px; font-weight: 800; text-transform: uppercase; letter-spacing: .1em; }
.status-dot::before { content: ""; display: inline-block; width: 7px; height: 7px; margin-right: 7px; border-radius: 50%; background: var(--lime); box-shadow: 0 0 0 5px rgba(199,236,136,.12); }
.route-list { padding: 4px 0 0; margin: 0; list-style: none; }
.route-list li { display: grid; grid-template-columns: 45px 1fr; gap: 14px; align-items: start; padding: 20px 0; border-bottom: 1px solid rgba(255,255,255,.12); }
.route-list li:last-child { border-bottom: 0; padding-bottom: 4px; }
.route-list li > span { color: var(--lime); font-family: Georgia, serif; font-size: 22px; }
.route-list strong { display: block; margin-bottom: 4px; color: white; font-size: 17px; }
.route-list small { display: block; color: #b8cbc4; font-size: 14px; line-height: 1.45; }

.section { padding: 96px 0; }
.section-intro { padding-bottom: 48px; }
.intro-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 60px; }
.large-copy { font-size: 20px; color: #52675f; }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 60px; margin-bottom: 42px; }
.section-heading > p { max-width: 430px; color: var(--muted); }
.topics-section { background: var(--mint-soft); }
.topic-grid { display: grid; grid-template-columns: repeat(2, 1fr); border-top: 1px solid #c7d9cc; border-left: 1px solid #c7d9cc; }
.topic-card { position: relative; min-height: 310px; padding: 30px; display: flex; flex-direction: column; justify-content: space-between; border-right: 1px solid #c7d9cc; border-bottom: 1px solid #c7d9cc; color: inherit; text-decoration: none; transition: background .2s ease, transform .2s ease; }
.topic-card:hover { z-index: 1; background: white; transform: translateY(-4px); box-shadow: var(--shadow); }
.topic-featured { background: var(--mint); }
.topic-number { color: #70887f; font: 18px Georgia, serif; }
.topic-icon { position: absolute; top: 26px; right: 28px; display: grid; place-items: center; width: 52px; height: 52px; border: 1px solid #aec8b6; border-radius: 50%; color: var(--ink); font-size: 24px; }
.topic-card p { max-width: 390px; color: #576c64; }
.card-link { display: block; margin-top: 18px; font-size: 14px; }

.steps-preview { background: var(--cream); }
.steps-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 100px; align-items: start; }
.steps-copy { position: sticky; top: 130px; }
.steps-copy p:not(.eyebrow) { color: var(--muted); font-size: 18px; }
.compact-steps { padding: 0; margin: 0; list-style: none; }
.compact-steps li { display: grid; grid-template-columns: 64px 1fr; gap: 18px; align-items: center; padding: 23px 0; border-bottom: 1px solid var(--line); }
.compact-steps span { color: var(--orange); font: 24px Georgia, serif; }
.compact-steps strong { color: var(--ink); font-size: 20px; }

.faq-section { background: white; }
.faq-grid { display: grid; grid-template-columns: .72fr 1.28fr; gap: 90px; }
.accordions details { border-top: 1px solid var(--line); }
.accordions details:last-child { border-bottom: 1px solid var(--line); }
.accordions summary { display: flex; justify-content: space-between; gap: 20px; padding: 24px 0; color: var(--ink); cursor: pointer; font-weight: 850; list-style: none; }
.accordions summary::-webkit-details-marker { display: none; }
.accordions summary span { font-size: 22px; transition: transform .2s ease; }
.accordions details[open] summary span { transform: rotate(45deg); }
.accordions details p { max-width: 650px; padding: 0 40px 24px 0; color: var(--muted); }

.page-hero { padding: 92px 0 78px; background: var(--cream); border-bottom: 1px solid var(--line); }
.page-hero .narrow { margin-left: max(20px, calc((100vw - 1160px) / 2)); }
.page-hero h1 { font-size: clamp(50px, 7vw, 82px); }
.page-hero p:last-child { max-width: 720px; color: #536a62; font-size: 21px; }
.page-hero.compact, .error-page { min-height: 55vh; display: grid; align-items: center; }
.article-layout { display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 90px; align-items: start; }
.prose { max-width: 750px; }
.prose h2 { margin-top: 58px; font-size: clamp(32px, 4vw, 46px); }
.prose h2:first-child { margin-top: 0; }
.prose h3 { margin-top: 36px; }
.prose p, .prose li { font-size: 18px; color: #435a52; }
.prose li { margin: 8px 0; }
.callout { margin: 36px 0; padding: 24px 26px; border-left: 4px solid var(--orange); border-radius: 0 14px 14px 0; background: var(--cream); font-size: 17px; }
.side-card { position: sticky; top: 120px; padding: 28px; border-radius: var(--radius); background: var(--mint); }
.side-card h2 { font-size: 32px; }
.side-card p:not(.eyebrow) { color: #435f55; }
.side-card .button { width: 100%; margin-top: 10px; }
.measure-grid, .glossary-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; margin: 36px 0; background: var(--line); border: 1px solid var(--line); }
.measure-grid > div, .glossary-grid article { padding: 28px; background: white; }
.measure-grid span { color: var(--orange); font: 20px Georgia, serif; }
.measure-grid h3 { margin-top: 24px; }
.measure-grid p, .glossary-grid p { font-size: 15px; }
.comparison { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin: 36px 0; }
.comparison > div { padding: 28px; border-radius: 18px; background: var(--mint-soft); }
.comparison h3 { font-size: 28px; }
.comparison p:last-child { font-size: 16px; }

.timeline { max-width: 920px; }
.timeline-step { display: grid; grid-template-columns: 100px 1fr; gap: 36px; padding: 0 0 68px; }
.timeline-number { position: relative; display: grid; place-items: center; width: 72px; height: 72px; border-radius: 50%; color: var(--ink-deep); background: var(--lime); font: 25px Georgia, serif; }
.timeline-number::after { content: ""; position: absolute; top: 82px; bottom: -58px; left: 50%; width: 1px; background: var(--line); }
.timeline-step:last-child .timeline-number::after { display: none; }
.timeline-step h2 { font-size: 38px; }
.timeline-step p:not(.eyebrow) { font-size: 18px; color: #52675f; }
.timeline-step strong { color: var(--ink); }
.note-section { padding-top: 0; }
.glossary-grid { grid-template-columns: repeat(3, 1fr); }
.glossary-grid article { min-height: 210px; }
.sources-section { background: var(--cream); }
.source-list { border-top: 1px solid var(--line); }
.source-list a { display: block; padding: 22px 4px; border-bottom: 1px solid var(--line); text-decoration: none; }
.source-list strong, .source-list span { display: block; }
.source-list strong { color: var(--ink); }
.source-list span { color: var(--muted); font-size: 14px; }

.closing-cta { padding: 76px 0; color: white; background: var(--ink); }
.closing-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 90px; align-items: end; }
.closing-cta h2 { max-width: 700px; color: white; }
.closing-cta p:not(.eyebrow) { color: #c5d4cf; }
.site-footer { padding: 70px 0 28px; background: var(--ink-deep); color: #b7cbc4; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 70px; }
.footer-brand { color: white; }
.footer-intro { max-width: 400px; margin-top: 22px; }
.site-footer h2 { color: white; font-size: 15px; letter-spacing: 0; }
.site-footer ul { padding: 0; margin: 0; list-style: none; }
.site-footer li { margin: 8px 0; }
.site-footer a { text-decoration: none; }
.site-footer a:hover { color: white; }
.footer-bottom { display: flex; justify-content: space-between; gap: 20px; padding-top: 32px; margin-top: 58px; border-top: 1px solid rgba(255,255,255,.12); font-size: 12px; }

:focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; } }

@media (max-width: 980px) {
  .menu-button { display: block; }
  .main-nav { position: absolute; top: 72px; left: 20px; right: 20px; display: none; padding: 14px; border: 1px solid var(--line); border-radius: 16px; background: white; box-shadow: var(--shadow); }
  .main-nav.is-open { display: grid; }
  .main-nav a { padding: 12px; }
  .hero-grid, .steps-grid, .faq-grid, .article-layout, .closing-grid { grid-template-columns: 1fr; gap: 52px; }
  .hero { padding-top: 70px; }
  .energy-card { max-width: 650px; transform: none; }
  .steps-copy, .side-card { position: static; }
  .side-card { max-width: 560px; }
  .glossary-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 700px) {
  .container { width: min(100% - 28px, 1160px); }
  .section { padding: 68px 0; }
  .nav-shell { min-height: 70px; }
  .hero { padding: 62px 0; }
  h1 { font-size: 48px; }
  h2 { font-size: 36px; }
  .hero-actions { align-items: stretch; flex-direction: column; }
  .button { width: 100%; }
  .trust-list { gap: 10px 18px; }
  .intro-grid, .topic-grid, .measure-grid, .comparison, .glossary-grid, .footer-grid { grid-template-columns: 1fr; }
  .intro-grid { gap: 12px; }
  .section-heading { display: block; }
  .topic-card { min-height: 270px; }
  .page-hero { padding: 64px 0 56px; }
  .page-hero .narrow { margin-inline: auto; }
  .page-hero h1 { font-size: 46px; }
  .timeline-step { grid-template-columns: 62px 1fr; gap: 20px; }
  .timeline-number { width: 56px; height: 56px; font-size: 20px; }
  .timeline-number::after { top: 66px; bottom: -60px; }
  .timeline-step h2 { font-size: 30px; }
  .footer-bottom { display: block; }
}