:root {
  --air-bg: #edf4f0;
  --air-bg-2: #f8f3ea;
  --air-panel: rgba(255, 255, 255, 0.86);
  --air-panel-strong: #ffffff;
  --air-line: rgba(19, 43, 38, 0.12);
  --air-line-strong: rgba(19, 43, 38, 0.18);
  --air-ink: #102520;
  --air-muted: #52615c;
  --air-accent: #0a8f6d;
  --air-accent-2: #14b58a;
  --air-accent-soft: rgba(10, 143, 109, 0.12);
  --air-sand: #ffbb6d;
  --air-shadow: 0 24px 48px rgba(13, 35, 30, 0.1);
  --air-radius: 24px;
  --shared-max: 1200px;
}

html {
  background:
    radial-gradient(circle at top left, rgba(20, 181, 138, 0.14), transparent 28%),
    radial-gradient(circle at 85% 14%, rgba(255, 187, 109, 0.2), transparent 24%),
    linear-gradient(180deg, var(--air-bg) 0%, var(--air-bg-2) 100%);
}

body {
  color: var(--air-ink);
  font-family: "Space Grotesk", sans-serif;
  background: transparent;
}

.site-main {
  padding-bottom: 72px;
}

.section {
  padding: 0 0 32px;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-end;
  margin-bottom: 20px;
}

.section-head h2 {
  margin: 6px 0 0;
  font-size: clamp(1.8rem, 3vw, 2.6rem);
  line-height: 1.04;
}

.section-head p {
  margin: 0;
  max-width: 42rem;
  color: var(--air-muted);
  line-height: 1.7;
}

.section-kicker,
.eyebrow,
.directive-label,
.metric-label,
.summary-label,
.pick-btu {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  background: var(--air-accent-soft);
  color: var(--air-accent);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.air-hero {
  padding: 8px 0 32px;
}

.air-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 24px;
}

.hero-copy,
.hero-panel,
.quick-pick-card,
.top-ten-card,
.method-card,
.explorer-toolbar,
.summary-card,
.catalog-card,
.results-empty,
.noscript-box,
.faq-item {
  border: 1px solid var(--air-line);
  background: var(--air-panel);
  box-shadow: var(--air-shadow);
  backdrop-filter: blur(12px);
}

.hero-copy,
.hero-panel {
  padding: 28px;
  border-radius: calc(var(--air-radius) + 4px);
}

.hero-copy {
  position: relative;
  overflow: hidden;
}

.hero-copy::after {
  content: "";
  position: absolute;
  inset: auto -10% -32% auto;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(20, 181, 138, 0.18), transparent 68%);
  pointer-events: none;
}

.hero-copy h1 {
  margin: 16px 0 14px;
  font-family: "Bebas Neue", "Impact", sans-serif;
  font-size: clamp(3.2rem, 7vw, 5.8rem);
  line-height: 0.92;
  letter-spacing: 0.01em;
}

.hero-subtitle,
.hero-note {
  max-width: 58ch;
  margin: 0 0 14px;
  line-height: 1.75;
}

.hero-subtitle {
  font-size: 1.06rem;
}

.hero-note {
  color: var(--air-muted);
}

.hero-actions,
.toolbar-buttons,
.results-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.button-primary,
.button-secondary,
.quick-pick-card,
.quick-filter,
.faq-item summary,
.catalog-details summary {
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.button-primary,
.button-secondary,
.toolbar-buttons button,
.results-actions button {
  appearance: none;
  border: none;
  text-decoration: none;
  font: inherit;
  cursor: pointer;
}

.button-primary,
.button-secondary,
.toolbar-buttons button,
.results-actions button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 700;
}

.button-primary {
  background: linear-gradient(135deg, var(--air-accent) 0%, var(--air-accent-2) 100%);
  color: #fff;
  box-shadow: 0 18px 34px rgba(10, 143, 109, 0.26);
}

.button-secondary {
  color: var(--air-ink);
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid var(--air-line-strong);
}

.button-primary:hover,
.button-secondary:hover,
.toolbar-buttons button:hover,
.results-actions button:hover,
.quick-pick-card:hover,
.quick-filter:hover,
.faq-item summary:hover,
.catalog-details summary:hover {
  transform: translateY(-1px);
}

.hero-panel {
  display: grid;
  gap: 18px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.metric-card {
  padding: 18px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--air-line);
}

.metric-card strong {
  display: block;
  margin-top: 10px;
  font-size: 2.1rem;
  line-height: 1;
}

.metric-note {
  display: block;
  margin-top: 8px;
  color: var(--air-muted);
  line-height: 1.55;
}

.hero-directive {
  padding: 18px;
  border-radius: 22px;
  background: linear-gradient(135deg, rgba(16, 37, 32, 0.98), rgba(20, 73, 63, 0.96));
  color: rgba(255, 255, 255, 0.92);
}

.hero-directive p {
  margin: 14px 0 0;
  line-height: 1.7;
}

.quick-picks-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.quick-pick-card {
  display: block;
  padding: 18px;
  border-radius: 22px;
  color: inherit;
  text-decoration: none;
}

.quick-pick-card h3 {
  margin: 14px 0 6px;
  font-size: 1.4rem;
}

.pick-model {
  margin: 0;
  min-height: 3.3em;
  color: var(--air-muted);
  line-height: 1.6;
}

.pick-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.pick-meta span,
.rank-context {
  color: var(--air-muted);
  font-size: 0.92rem;
}

.section-top10 .top-ten-list {
  display: grid;
  gap: 12px;
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: top-ten;
}

.top-ten-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  gap: 18px;
  align-items: center;
  padding: 18px 20px;
  border-radius: 22px;
}

.top-ten-card h3,
.catalog-card h3 {
  margin: 0 0 6px;
  font-size: 1.18rem;
}

.top-ten-card p,
.catalog-card p,
.method-card p,
.faq-item p,
.results-note,
.method-footnote {
  margin: 0;
  color: var(--air-muted);
  line-height: 1.7;
}

.rank-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 54px;
  padding: 12px 12px 10px;
  border-radius: 18px;
  background: rgba(16, 37, 32, 0.08);
  color: var(--air-ink);
  font-family: "Bebas Neue", "Impact", sans-serif;
  font-size: 1.7rem;
  letter-spacing: 0.04em;
}

.top-ten-card strong {
  font-size: 1.55rem;
}

.method-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.method-card {
  padding: 22px;
  border-radius: 22px;
}

.method-card h3 {
  margin: 0 0 12px;
  font-size: 1.18rem;
}

.method-card p + p {
  margin-top: 12px;
}

.method-footnote {
  margin-top: 16px;
}

.method-footnote a {
  color: var(--air-accent);
  font-weight: 700;
}

.explorer-section {
  scroll-margin-top: calc(var(--shared-header-offset) + 16px);
}

.explorer-toolbar {
  position: sticky;
  top: calc(var(--shared-header-offset) + 14px);
  z-index: 5;
  padding: 18px;
  border-radius: 24px;
  margin-bottom: 16px;
}

.toolbar-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 12px;
}

.field {
  display: grid;
  gap: 8px;
  font-size: 0.94rem;
  font-weight: 600;
}

.field span {
  color: var(--air-muted);
}

.field-search {
  grid-column: span 2;
}

.field input,
.field select {
  min-width: 0;
  padding: 12px 14px;
  border-radius: 16px;
  border: 1px solid var(--air-line-strong);
  background: rgba(255, 255, 255, 0.88);
  color: var(--air-ink);
  font: inherit;
}

.field input:focus,
.field select:focus {
  outline: 3px solid rgba(10, 143, 109, 0.22);
  outline-offset: 1px;
  border-color: rgba(10, 143, 109, 0.42);
}

.toolbar-actions {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-top: 16px;
}

.toolbar-note {
  margin: 14px 0 0;
  color: var(--air-muted);
  line-height: 1.7;
}

.quick-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.quick-filter {
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid var(--air-line-strong);
  background: rgba(255, 255, 255, 0.78);
  color: var(--air-ink);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.quick-filter.is-active {
  background: linear-gradient(135deg, var(--air-accent) 0%, var(--air-accent-2) 100%);
  color: #fff;
  border-color: transparent;
}

.results-shell {
  display: grid;
  gap: 14px;
}

.results-summary {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.summary-card {
  padding: 18px;
  border-radius: 22px;
}

.summary-card strong {
  display: block;
  margin-top: 12px;
  font-size: 1.45rem;
  line-height: 1.2;
}

.summary-card span:last-child {
  display: block;
  margin-top: 8px;
  color: var(--air-muted);
  line-height: 1.55;
}

.results-meta {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.copy-feedback {
  color: var(--air-accent);
  font-weight: 700;
  min-height: 1.4em;
}

.results-list {
  display: grid;
  gap: 12px;
}

.catalog-card,
.results-empty,
.noscript-box {
  padding: 18px;
  border-radius: 22px;
}

.catalog-card {
  display: grid;
  grid-template-columns: 128px minmax(0, 1fr);
  gap: 16px;
}

.card-rank {
  display: grid;
  gap: 8px;
  align-content: start;
}

.card-main {
  display: grid;
  gap: 14px;
}

.card-head {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
}

.card-head p {
  margin-top: 4px;
}

.card-idrs {
  white-space: nowrap;
  font-size: 1.75rem;
  line-height: 1;
}

.card-specs {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}

.card-specs li {
  padding: 12px 14px;
  border-radius: 18px;
  background: rgba(16, 37, 32, 0.05);
}

.card-specs span,
.catalog-meta,
.catalog-variant-note {
  display: block;
  color: var(--air-muted);
  font-size: 0.9rem;
}

.card-specs strong {
  display: block;
  margin-top: 6px;
  font-size: 1rem;
}

.catalog-meta {
  line-height: 1.65;
}

.card-energy {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.energy-card {
  padding: 14px 16px;
  border-radius: 18px;
  background: rgba(10, 143, 109, 0.08);
  border: 1px solid rgba(10, 143, 109, 0.12);
}

.energy-card span,
.energy-card small {
  display: block;
  color: var(--air-muted);
}

.energy-card strong {
  display: block;
  margin-top: 6px;
  font-size: 1.08rem;
}

.energy-card small {
  margin-top: 8px;
  line-height: 1.55;
}

.catalog-details {
  border-top: 1px solid var(--air-line);
  padding-top: 12px;
}

.catalog-details summary {
  cursor: pointer;
  font-weight: 700;
  list-style: none;
}

.catalog-details summary::-webkit-details-marker {
  display: none;
}

.catalog-details summary::after {
  content: "▾";
  margin-left: 8px;
  color: var(--air-accent);
}

.catalog-details[open] summary::after {
  content: "▴";
}

.catalog-details-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 12px;
}

.catalog-list {
  margin: 0;
  padding-left: 18px;
  color: var(--air-muted);
  line-height: 1.7;
}

.results-empty h3,
.noscript-box h3 {
  margin: 0 0 8px;
}

.faq-list {
  display: grid;
  gap: 12px;
}

.faq-item {
  border-radius: 22px;
  overflow: hidden;
}

.faq-item summary {
  cursor: pointer;
  list-style: none;
  padding: 18px 22px;
  font-weight: 700;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  float: right;
  color: var(--air-accent);
}

.faq-item[open] summary::after {
  content: "–";
}

.faq-item p {
  padding: 0 22px 20px;
}

@media (max-width: 1080px) {
  .air-hero-grid,
  .method-grid,
  .results-summary {
    grid-template-columns: 1fr;
  }

  .quick-picks-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .toolbar-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .field-search {
    grid-column: span 2;
  }

  .top-ten-card,
  .catalog-card,
  .card-head {
    grid-template-columns: 1fr;
  }

  .card-head {
    display: grid;
  }

  .card-idrs {
    white-space: normal;
  }

  .card-specs,
  .card-energy,
  .catalog-details-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .section {
    padding-bottom: 24px;
  }

  .shared-container {
    width: min(100% - 24px, var(--shared-max));
  }

  .hero-copy,
  .hero-panel,
  .quick-pick-card,
  .top-ten-card,
  .method-card,
  .explorer-toolbar,
  .summary-card,
  .catalog-card,
  .results-empty,
  .noscript-box,
  .faq-item {
    border-radius: 20px;
  }

  .hero-copy,
  .hero-panel {
    padding: 20px;
  }

  .explorer-toolbar {
    position: static;
    padding: 20px;
  }

  .hero-copy h1 {
    font-size: clamp(2.8rem, 15vw, 4.2rem);
  }

  .hero-metrics,
  .quick-picks-grid,
  .toolbar-grid,
  .results-summary,
  .card-specs,
  .card-energy,
  .catalog-details-grid {
    grid-template-columns: 1fr;
  }

  .field-search {
    grid-column: auto;
  }

  .section-head {
    align-items: flex-start;
  }

  .top-ten-card {
    padding: 16px;
  }

  .catalog-card {
    grid-template-columns: 1fr;
  }

  .toolbar-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .toolbar-buttons,
  .hero-actions,
  .results-actions {
    width: 100%;
  }

  .toolbar-buttons button,
  .button-primary,
  .button-secondary,
  .results-actions button {
    width: 100%;
  }

  .quick-filter {
    flex: 1 1 calc(50% - 10px);
    justify-content: center;
  }
}