:root {
  color-scheme: light;
  --ink: #18231f;
  --muted: #66706b;
  --line: #dbe4df;
  --paper: #fbfdf9;
  --surface: #ffffff;
  --green: #13795b;
  --green-2: #0f5f49;
  --mint: #dff5e8;
  --blue: #215b7d;
  --amber: #f4b740;
  --rose: #d85b56;
  --shadow: 0 16px 45px rgba(31, 48, 42, .11);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background:
    linear-gradient(180deg, rgba(223, 245, 232, .85), rgba(251, 253, 249, 0) 460px),
    var(--paper);
  line-height: 1.55;
}

a {
  color: inherit;
}

.skip {
  position: absolute;
  left: -999px;
  top: 12px;
  background: var(--ink);
  color: #fff;
  padding: .7rem 1rem;
  z-index: 20;
}

.skip:focus {
  left: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(18px);
  background: rgba(251, 253, 249, .82);
  border-bottom: 1px solid rgba(219, 228, 223, .9);
}

.nav {
  width: min(1180px, calc(100% - 32px));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  text-decoration: none;
  letter-spacing: 0;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  color: #fff;
  background: linear-gradient(135deg, var(--green), var(--blue));
  font-size: 18px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 14px;
  color: var(--muted);
  font-size: .95rem;
}

.nav-links a {
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a:focus-visible {
  color: var(--green-2);
}

.button,
button {
  border: 0;
  border-radius: 8px;
  background: var(--green);
  color: #fff;
  padding: .85rem 1.05rem;
  font-weight: 750;
  font-size: .98rem;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .45rem;
  min-height: 44px;
}

.button:hover,
button:hover {
  background: var(--green-2);
}

.button.secondary {
  background: #eef7f2;
  color: var(--green-2);
  border: 1px solid #c9e7d6;
}

.button.ghost {
  background: transparent;
  color: var(--green-2);
  border: 1px solid var(--line);
}

main {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, .95fr);
  gap: 34px;
  align-items: start;
  margin-top: 28px;
  padding: 56px;
  border: 1px solid rgba(219, 228, 223, .9);
  border-radius: 8px;
  background:
    linear-gradient(90deg, rgba(251, 253, 249, .96) 0%, rgba(251, 253, 249, .86) 39%, rgba(251, 253, 249, .34) 70%),
    url("/assets/hero-energy-efficient-home.jpg") center right / cover no-repeat;
  box-shadow: var(--shadow);
}

.hero > * {
  position: relative;
  z-index: 1;
}

.hero-photo {
  display: none;
}

.eyebrow {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: .45rem;
  padding: .35rem .6rem;
  border: 1px solid #b9dfc9;
  border-radius: 999px;
  background: rgba(255, 255, 255, .72);
  color: var(--green-2);
  font-weight: 750;
  font-size: .83rem;
}

h1,
h2,
h3 {
  line-height: 1.08;
  letter-spacing: 0;
}

h1 {
  font-size: clamp(2.35rem, 5vw, 4.7rem);
  margin: 18px 0 18px;
  max-width: 11ch;
}

h2 {
  font-size: clamp(1.9rem, 3vw, 3rem);
  margin: 0 0 14px;
}

h3 {
  font-size: 1.2rem;
  margin: 0 0 10px;
}

p {
  margin: 0 0 1rem;
}

.lead {
  font-size: clamp(1.05rem, 1.8vw, 1.27rem);
  max-width: 64ch;
  color: #42514a;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 26px 0;
}

.trust-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin-top: 28px;
}

.trust-item {
  border-top: 3px solid var(--green);
  padding-top: 10px;
  color: var(--muted);
  font-size: .95rem;
}

.trust-item strong {
  display: block;
  color: var(--ink);
  font-size: 1.2rem;
}

.calculator {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 20px;
  box-shadow: var(--shadow);
}

.calculator header {
  display: flex;
  justify-content: space-between;
  align-items: start;
  gap: 12px;
  margin-bottom: 16px;
}

.badge {
  white-space: nowrap;
  border-radius: 999px;
  background: #fff3d3;
  color: #805a00;
  padding: .35rem .55rem;
  font-size: .78rem;
  font-weight: 760;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

label {
  display: grid;
  gap: 6px;
  color: #3b4741;
  font-weight: 700;
  font-size: .9rem;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid #cdd9d3;
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: .78rem .82rem;
  min-height: 44px;
  font: inherit;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

.results {
  margin-top: 18px;
  display: grid;
  gap: 12px;
}

.result-main {
  background: #f1faf5;
  border: 1px solid #c8ebd5;
  border-radius: 8px;
  padding: 16px;
}

.result-main span {
  display: block;
  color: var(--muted);
  font-weight: 700;
  font-size: .86rem;
}

.result-main strong {
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1;
}

.result-bars {
  display: grid;
  gap: 9px;
}

.bar-row {
  display: grid;
  grid-template-columns: 120px 1fr 76px;
  gap: 10px;
  align-items: center;
  font-size: .88rem;
}

.bar {
  height: 12px;
  border-radius: 999px;
  background: #edf1ee;
  overflow: hidden;
}

.bar i {
  display: block;
  height: 100%;
  width: var(--w);
  background: var(--green);
  border-radius: inherit;
}

section {
  padding: 56px 0;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: end;
  margin-bottom: 22px;
}

.section-head p {
  max-width: 58ch;
  color: var(--muted);
}

.cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
}

.card,
.article,
.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.card {
  padding: 18px;
  min-height: 250px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.card .topline,
.article .topline {
  color: var(--blue);
  font-size: .78rem;
  font-weight: 800;
  text-transform: uppercase;
}

.metric {
  display: grid;
  gap: 2px;
  margin-top: 16px;
  color: var(--muted);
  font-size: .88rem;
}

.metric strong {
  color: var(--ink);
  font-size: 1.3rem;
}

.fit {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: 12px;
}

.fit span {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .25rem .5rem;
  font-size: .78rem;
  color: #47554f;
}

.model {
  display: grid;
  grid-template-columns: .85fr 1.15fr;
  gap: 18px;
  align-items: stretch;
}

.panel {
  padding: 22px;
}

.scoreboard {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.score {
  border-left: 4px solid var(--green);
  padding: 12px;
  background: #f8fbf8;
}

.score strong {
  display: block;
  font-size: 1.7rem;
}

.timeline {
  display: grid;
  gap: 12px;
  counter-reset: step;
}

.timeline li {
  list-style: none;
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 12px;
  align-items: start;
}

.timeline li::before {
  counter-increment: step;
  content: counter(step);
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  background: var(--green);
  color: #fff;
  font-weight: 800;
}

.articles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.article {
  padding: 20px;
  min-height: 205px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.article a {
  font-weight: 800;
  text-decoration: none;
}

.article a:hover {
  color: var(--green-2);
}

.content-hub {
  padding-top: 64px;
}

.hub-feature {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 20px;
  align-items: center;
  margin-bottom: 16px;
  padding: 22px;
  border: 1px solid #b9dfc9;
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(223, 245, 232, .92), rgba(255, 255, 255, .94)),
    #fff;
}

.hub-feature h3 {
  font-size: clamp(1.45rem, 2.5vw, 2.2rem);
}

.lead-box {
  background: #12251f;
  color: #f4fff8;
  border-radius: 8px;
  display: grid;
  grid-template-columns: .9fr 1.1fr;
  gap: 22px;
  padding: 24px;
}

.lead-box p {
  color: #c8ddd3;
}

.lead-box input,
.lead-box select,
.lead-box textarea {
  border-color: rgba(255, 255, 255, .22);
}

.mini-note {
  color: var(--muted);
  font-size: .88rem;
}

.lead-box .mini-note {
  color: #bfd5cb;
}

.site-footer {
  border-top: 1px solid var(--line);
  margin-top: 40px;
  padding: 26px 0 42px;
  color: var(--muted);
}

.footer-inner {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-inner a {
  color: #45534d;
  margin-right: 12px;
}

.page {
  max-width: 820px;
  padding: 54px 0;
}

.page h1 {
  max-width: 14ch;
}

.page h2 {
  font-size: 1.45rem;
  margin-top: 32px;
}

.article-page {
  max-width: 920px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 24px;
}

.article-meta span,
.source-list a {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .28rem .58rem;
  color: #48564f;
  font-size: .86rem;
  text-decoration: none;
}

.article-lead {
  font-size: 1.12rem;
  color: #3d4e46;
}

.decision-box,
.toc-box,
.next-box {
  border: 1px solid #c8ebd5;
  border-radius: 8px;
  background: #f1faf5;
  padding: 18px;
  margin: 22px 0;
}

.decision-box ul,
.toc-box ul,
.article-page ul {
  padding-left: 1.25rem;
}

.comparison-table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0 24px;
  background: #fff;
  border: 1px solid var(--line);
}

.comparison-table th,
.comparison-table td {
  border-bottom: 1px solid var(--line);
  padding: .85rem;
  text-align: left;
  vertical-align: top;
}

.comparison-table th {
  background: #eef7f2;
}

.source-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 12px;
}

@media (max-width: 920px) {
  .hero,
  .model,
  .lead-box,
  .hub-feature {
    grid-template-columns: 1fr;
  }

  .cards,
  .articles {
    grid-template-columns: repeat(2, 1fr);
  }

  .nav {
    align-items: flex-start;
    padding: 14px 0;
    flex-direction: column;
  }

  .nav-links {
    flex-wrap: wrap;
    width: 100%;
    gap: 8px;
  }

  .nav-links a {
    border: 1px solid var(--line);
    border-radius: 999px;
    padding: .35rem .58rem;
    background: rgba(255, 255, 255, .72);
    font-size: .88rem;
  }

  .hero {
    padding: 34px 24px;
    background:
      linear-gradient(180deg, rgba(251, 253, 249, .98) 0%, rgba(251, 253, 249, .94) 100%),
      url("/assets/hero-energy-efficient-home.jpg") center / cover no-repeat;
  }

  .hero-photo {
    display: block;
    min-height: 230px;
    border: 1px solid rgba(219, 228, 223, .85);
    border-radius: 8px;
    background: url("/assets/hero-energy-efficient-home.jpg") center / cover no-repeat;
    box-shadow: 0 12px 32px rgba(31, 48, 42, .14);
  }
}

@media (max-width: 640px) {
  main,
  .nav,
  .footer-inner {
    width: min(100% - 24px, 1180px);
  }

  .hero {
    padding: 28px 18px;
    margin-top: 16px;
  }

  .hero-photo {
    min-height: 190px;
  }

  .form-grid,
  .cards,
  .articles,
  .scoreboard,
  .trust-row {
    grid-template-columns: 1fr;
  }

  .section-head {
    display: block;
  }

  .bar-row {
    grid-template-columns: 88px 1fr 62px;
  }
}