:root {
  --green-950: #073b31;
  --green-900: #0b4b3e;
  --green-800: #125d4d;
  --green-700: #177160;
  --teal-600: #138f82;
  --teal-500: #21a99a;
  --sand-500: #d4a75f;
  --sand-100: #f7efe2;
  --ink: #18312c;
  --muted: #536963;
  --line: #dce7e3;
  --soft: #f4f8f6;
  --white: #ffffff;
  --shadow: 0 22px 50px rgb(7 59 49 / 10%);
  --radius-sm: 0.5rem;
  --radius-md: 0.85rem;
  --radius-lg: 1.25rem;
  --container: 72rem;
  --reading: 48rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  background: var(--white);
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

img,
svg {
  display: block;
  max-width: 100%;
}

img {
  height: auto;
}

a {
  color: var(--green-800);
  text-decoration-thickness: 0.08em;
  text-underline-offset: 0.18em;
}

a:hover {
  color: var(--teal-600);
}

:focus-visible {
  outline: 3px solid var(--sand-500);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  transform: translateY(-180%);
  padding: 0.7rem 1rem;
  border-radius: var(--radius-sm);
  background: var(--green-950);
  color: var(--white);
}

.skip-link:focus {
  transform: none;
}

.container {
  width: min(calc(100% - 2rem), var(--container));
  margin-inline: auto;
}

.reading {
  width: min(100%, var(--reading));
}

.site-header {
  position: sticky;
  z-index: 30;
  top: 0;
  border-bottom: 1px solid rgb(220 231 227 / 88%);
  background: rgb(255 255 255 / 94%);
  backdrop-filter: blur(12px);
}

.header-row {
  min-height: 5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--green-950);
  font-size: 1.15rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  text-decoration: none;
  white-space: nowrap;
}

.brand-mark {
  width: 2.4rem;
  height: 2.4rem;
  padding: 0.45rem;
  border-radius: 50%;
  background: var(--green-900);
  color: var(--white);
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  margin-left: auto;
}

.desktop-nav a {
  color: var(--ink);
  font-size: 0.92rem;
  font-weight: 650;
  text-decoration: none;
}

.desktop-nav a[aria-current="page"],
.desktop-nav a:hover {
  color: var(--teal-600);
}

.mobile-nav {
  display: none;
  margin-left: auto;
}

.mobile-nav summary {
  cursor: pointer;
  list-style: none;
  padding: 0.6rem 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--green-950);
  font-weight: 750;
}

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

.mobile-menu {
  position: absolute;
  top: calc(100% + 0.4rem);
  right: 1rem;
  left: 1rem;
  display: grid;
  gap: 0.25rem;
  padding: 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--white);
  box-shadow: var(--shadow);
}

.mobile-menu a {
  padding: 0.7rem 0.8rem;
  border-radius: var(--radius-sm);
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
}

.mobile-menu a:hover {
  background: var(--soft);
}

.button {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.78rem 1.15rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: var(--teal-600);
  color: var(--white);
  font-size: 0.94rem;
  font-weight: 800;
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  transition: transform 160ms ease, background-color 160ms ease, border-color 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
  background: var(--green-800);
  color: var(--white);
}

.button--outline {
  border-color: var(--teal-600);
  background: transparent;
  color: var(--green-800);
}

.button--outline:hover {
  background: var(--soft);
  color: var(--green-950);
}

.button--sand {
  background: var(--sand-500);
  color: var(--green-950);
}

.button--sand:hover {
  background: #e1b971;
  color: var(--green-950);
}

.hero {
  border-bottom: 1px solid var(--line);
}

.hero-grid {
  display: grid;
  min-height: 38rem;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: stretch;
}

.hero-copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 5rem clamp(2rem, 5vw, 5.5rem) 5rem max(1rem, calc((100vw - var(--container)) / 2));
}

.hero h1,
.page-hero h1 {
  max-width: 14ch;
  margin: 0;
  color: var(--green-950);
  font-size: clamp(2.45rem, 5vw, 4.8rem);
  font-weight: 850;
  letter-spacing: -0.055em;
  line-height: 1.02;
}

.hero-copy > p {
  max-width: 38rem;
  margin: 1.5rem 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.6vw, 1.22rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.hero-media {
  position: relative;
  display: grid;
  overflow: hidden;
  min-height: 34rem;
  place-items: center;
  background: var(--soft);
}

.hero-media img {
  width: min(92%, 58rem);
  object-fit: contain;
}

.section {
  padding-block: clamp(4rem, 8vw, 7.5rem);
}

.section--soft {
  background: var(--soft);
}

.section--green {
  background: var(--green-950);
  color: var(--white);
}

.section-header {
  display: grid;
  max-width: 52rem;
  gap: 0.8rem;
  margin-bottom: 2.4rem;
}

.section h2,
.content h2 {
  margin: 0;
  color: var(--green-950);
  font-size: clamp(1.9rem, 3.2vw, 3rem);
  letter-spacing: -0.04em;
  line-height: 1.12;
}

.section--green h2 {
  color: var(--white);
}

.section-header p {
  margin: 0;
  color: var(--muted);
  font-size: 1.08rem;
}

.eyebrow {
  margin: 0 0 0.8rem;
  color: var(--teal-600);
  font-size: 0.78rem;
  font-weight: 850;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.compact-prv .section-header {
  margin-bottom: 1.5rem;
}

.compact-model-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
}

.compact-model {
  padding: 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--soft);
}

.compact-model h3 {
  margin: 0 0 0.4rem;
  color: var(--green-950);
  font-size: 1.05rem;
  line-height: 1.3;
}

.compact-model p {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.compact-prv-media {
  margin: 0;
  background: var(--soft);
}

.compact-prv-media img {
  aspect-ratio: 3 / 2;
}

.section--green .section-header p,
.section--green .muted {
  color: #c7d9d3;
}

.split {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 5.5rem);
}

.split-media {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--white);
  box-shadow: var(--shadow);
}

.split-media img {
  width: 100%;
  aspect-ratio: 15 / 8;
  object-fit: contain;
}

.feature-list,
.check-list,
.source-list {
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}

.feature-list li,
.check-list li {
  position: relative;
  padding: 0.85rem 0 0.85rem 2rem;
  border-bottom: 1px solid var(--line);
}

.feature-list li::before,
.check-list li::before {
  position: absolute;
  top: 1.05rem;
  left: 0;
  width: 1.15rem;
  height: 1.15rem;
  border-radius: 50%;
  background: var(--teal-500);
  color: var(--white);
  content: "✓";
  font-size: 0.72rem;
  font-weight: 900;
  line-height: 1.15rem;
  text-align: center;
}

.activity-grid {
  display: grid;
  overflow: hidden;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.activity {
  min-height: 14rem;
  padding: clamp(1.7rem, 4vw, 3rem);
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.activity:nth-child(odd) {
  border-right: 1px solid var(--line);
}

.activity:nth-last-child(-n + 2) {
  border-bottom: 0;
}

.activity h3,
.material h3,
.step h3,
.content h3 {
  margin: 0 0 0.5rem;
  color: var(--green-950);
  font-size: 1.25rem;
  line-height: 1.25;
}

.activity p,
.material p,
.step p {
  margin: 0;
  color: var(--muted);
}

.materials {
  display: grid;
  overflow: hidden;
  grid-template-columns: minmax(0, 2.35fr) minmax(15rem, 0.65fr);
  gap: 0.85rem;
  border-radius: var(--radius-lg);
}

.material {
  display: grid;
  min-height: 24rem;
  grid-template-columns: minmax(0, 1fr) minmax(9rem, 0.72fr);
  align-items: center;
  gap: 1.5rem;
  padding: clamp(1.5rem, 4vw, 3rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.material--featured {
  background: var(--soft);
  color: var(--ink);
  box-shadow: var(--shadow);
}

.material--secondary {
  min-height: auto;
  grid-template-columns: 1fr;
  align-content: center;
  background: var(--sand-100);
}

.material h3 {
  color: var(--green-950);
}

.material p {
  color: var(--muted);
}

.material img {
  width: 100%;
  border-radius: var(--radius-md);
  background: var(--white);
}

.material .button {
  margin-top: 1.25rem;
}

.material--secondary a {
  display: inline-block;
  margin-top: 1.25rem;
  font-weight: 800;
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.5rem;
  counter-reset: step;
}

.step {
  position: relative;
  padding-top: 3.5rem;
  counter-increment: step;
}

.step::before {
  position: absolute;
  top: 0;
  left: 0;
  display: grid;
  width: 2.55rem;
  height: 2.55rem;
  border-radius: 50%;
  background: var(--teal-600);
  color: var(--white);
  content: counter(step);
  font-weight: 850;
  place-items: center;
}

.faq-list {
  border-top: 1px solid var(--line);
}

.faq-list details {
  border-bottom: 1px solid var(--line);
}

.faq-list summary {
  cursor: pointer;
  padding: 1.1rem 2.5rem 1.1rem 0;
  color: var(--green-950);
  font-weight: 800;
}

.faq-list details p {
  max-width: 52rem;
  margin: -0.25rem 0 1.25rem;
  color: var(--muted);
}

.cta-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 2rem;
  padding: clamp(2rem, 5vw, 4rem);
  border-radius: var(--radius-lg);
  background: var(--green-950);
  color: var(--white);
}

.cta-band h2 {
  margin: 0;
  color: var(--white);
  font-size: clamp(1.8rem, 3vw, 2.8rem);
  letter-spacing: -0.035em;
  line-height: 1.12;
}

.cta-band p {
  max-width: 42rem;
  margin: 0.75rem 0 0;
  color: #c7d9d3;
}

.page-hero {
  padding-block: clamp(4rem, 9vw, 8rem);
  border-bottom: 1px solid var(--line);
  background: var(--soft);
}

.page-hero h1 {
  max-width: 17ch;
  font-size: clamp(2.4rem, 5vw, 4.25rem);
}

.page-hero p {
  max-width: 48rem;
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: 1.15rem;
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 0 0 1.5rem;
  color: var(--muted);
  font-size: 0.88rem;
}

.breadcrumbs a {
  color: var(--green-800);
}

.content {
  width: min(100%, var(--reading));
}

.content > * + * {
  margin-top: 1.35rem;
}

.content h2 {
  margin-top: 3.4rem;
  font-size: clamp(1.7rem, 3vw, 2.45rem);
}

.content h3 {
  margin-top: 2.2rem;
}

.content p,
.content li {
  color: #334a44;
}

.content ul,
.content ol {
  padding-left: 1.3rem;
}

.content li + li {
  margin-top: 0.55rem;
}

.content-figure {
  margin-inline: 0;
  padding: 0.8rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--soft);
}

.content-figure img {
  width: 100%;
  border-radius: var(--radius-md);
}

.content-figure figcaption {
  padding: 0.75rem 0.4rem 0.1rem;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.5;
}

.notice {
  padding: 1.2rem 1.35rem;
  border-left: 4px solid var(--sand-500);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: var(--sand-100);
  color: var(--ink);
}

.page-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 18rem;
  align-items: start;
  gap: clamp(2.5rem, 7vw, 7rem);
}

.aside {
  position: sticky;
  top: 7rem;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--soft);
}

.aside h2 {
  margin: 0 0 0.8rem;
  font-size: 1.1rem;
}

.aside a:not(.button) {
  display: block;
  padding-block: 0.42rem;
  font-size: 0.93rem;
  font-weight: 650;
}

.aside .button {
  width: 100%;
  margin-top: 1rem;
}

.source-list li + li {
  margin-top: 0.6rem;
}

.site-footer {
  padding: 4rem 0 1.5rem;
  border-top: 1px solid var(--line);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 3rem;
}

.footer-grid h2,
.footer-grid h3 {
  margin: 0 0 0.7rem;
  color: var(--green-950);
  font-size: 1.05rem;
}

.footer-grid p {
  max-width: 28rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-links {
  display: grid;
  gap: 0.45rem;
}

.footer-links a {
  font-size: 0.92rem;
  font-weight: 650;
}

.footer-bottom {
  margin-top: 3rem;
  padding-top: 1.2rem;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.82rem;
}

@media (max-width: 64rem) {
  .desktop-nav,
  .header-row > .button {
    display: none;
  }

  .mobile-nav {
    display: block;
  }

  .hero-grid {
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .hero-copy {
    padding: 4.5rem max(1rem, calc((100vw - var(--container)) / 2));
  }

  .hero h1 {
    max-width: 16ch;
  }

  .hero-media {
    min-height: 24rem;
  }

  .materials {
    grid-template-columns: 1fr;
  }

  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    row-gap: 3rem;
  }

  .page-layout {
    grid-template-columns: 1fr;
  }

  .aside {
    position: static;
  }
}

@media (max-width: 44rem) {
  html {
    scroll-padding-top: 5rem;
  }

  .header-row {
    min-height: 4.5rem;
  }

  .brand {
    font-size: 1rem;
  }

  .brand-mark {
    width: 2.15rem;
    height: 2.15rem;
  }

  .hero-copy {
    padding-block: 3.5rem;
  }

  .hero h1,
  .page-hero h1 {
    font-size: clamp(2.25rem, 12vw, 3.4rem);
  }

  .hero-media {
    order: -1;
    min-height: 19rem;
  }

  .actions,
  .actions .button {
    width: 100%;
  }

  .compact-model-grid {
    grid-template-columns: 1fr;
  }

  .split,
  .activity-grid,
  .steps,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .activity,
  .activity:nth-child(odd),
  .activity:nth-last-child(-n + 2) {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .activity:last-child {
    border-bottom: 0;
  }

  .material {
    min-height: auto;
    grid-template-columns: 1fr;
  }

  .material img {
    max-width: 22rem;
  }

  .cta-band {
    grid-template-columns: 1fr;
  }

  .cta-band .button {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}

@media print {
  .site-header,
  .site-footer,
  .aside,
  .actions,
  .cta-band {
    display: none !important;
  }

  body {
    color: #000;
  }

  .section,
  .page-hero {
    padding-block: 1.5rem;
  }
}