:root {
  --bg: #f7f8f5;
  --surface: #ffffff;
  --surface-strong: #eef3ee;
  --ink: #15201d;
  --muted: #5f6b66;
  --line: #d9e1dc;
  --teal: #137d75;
  --teal-dark: #0d5d58;
  --moss: #83925a;
  --coral: #d36b4b;
  --gold: #dba84d;
  --shadow: 0 18px 48px rgba(20, 31, 29, 0.12);
  --radius: 8px;
  color-scheme: light;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.55;
  overflow-x: hidden;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 16px clamp(20px, 4vw, 56px);
  background: rgba(247, 248, 245, 0.86);
  border-bottom: 1px solid rgba(217, 225, 220, 0.72);
  backdrop-filter: blur(18px);
}

.brand {
  font-weight: 800;
  letter-spacing: 0;
}

nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px 18px;
  color: var(--muted);
  font-size: 0.92rem;
}

nav a {
  transition:
    color 160ms ease,
    transform 160ms ease;
}

nav a:hover {
  color: var(--teal-dark);
  transform: translateY(-1px);
}

.section {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: clamp(56px, 8vw, 104px) 0;
}

.hero {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(420px, 1.1fr);
  align-items: center;
  gap: clamp(36px, 5vw, 72px);
  min-height: min(860px, calc(100vh - 64px));
  padding-top: clamp(32px, 5vw, 64px);
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: 100%;
  min-width: 0;
  max-width: 620px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--teal-dark);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 14px;
  font-size: clamp(4rem, 9vw, 8.4rem);
  line-height: 0.88;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(2rem, 4vw, 4.1rem);
  line-height: 1;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.05rem;
  line-height: 1.22;
  letter-spacing: 0;
}

.subtitle {
  max-width: 680px;
  margin-bottom: 18px;
  font-size: clamp(1.42rem, 3vw, 2.35rem);
  line-height: 1.12;
  font-weight: 720;
}

.lead {
  color: var(--teal-dark);
  font-size: 1.18rem;
  font-weight: 760;
}

.hero-copy > p:not(.eyebrow, .subtitle, .lead) {
  color: var(--muted);
  font-size: 1.04rem;
}

.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 30px 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 116px;
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 8px 20px rgba(20, 31, 29, 0.08);
  color: var(--ink);
  font-weight: 760;
  transition:
    background 160ms ease,
    border-color 160ms ease,
    color 160ms ease,
    transform 160ms ease;
}

.button:hover {
  border-color: rgba(19, 125, 117, 0.45);
  transform: translateY(-2px);
}

.button.primary {
  border-color: var(--teal-dark);
  background: var(--teal-dark);
  color: #ffffff;
}

.button.primary:hover {
  background: var(--teal);
}

.authors {
  max-width: 660px;
  padding-top: 8px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.9rem;
}

.authors p {
  margin-bottom: 7px;
}

.hero-visual,
.wide-figure,
.protocol-figure {
  width: 100%;
  min-width: 0;
  margin: 0;
}

.hero-visual {
  position: relative;
  z-index: 1;
  overflow: hidden;
  border-radius: var(--radius);
  background: #edf2ee;
  box-shadow: var(--shadow);
}

.hero-visual img {
  width: 100%;
  height: auto;
}

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

.metric {
  min-height: 138px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 10px 24px rgba(20, 31, 29, 0.06);
}

.metric strong {
  display: block;
  color: var(--teal-dark);
  font-size: clamp(2.4rem, 4.4vw, 3.8rem);
  line-height: 0.95;
  letter-spacing: 0;
}

.metric:first-child strong {
  font-size: clamp(2.2rem, 3.7vw, 3.35rem);
}

.metric span {
  display: block;
  margin-top: 14px;
  color: var(--muted);
  font-weight: 760;
}

.narrative {
  display: grid;
  grid-template-columns: 0.42fr 0.58fr;
  gap: 28px 56px;
}

.section-heading {
  max-width: 720px;
}

.narrative-copy {
  align-self: end;
  max-width: 720px;
  color: var(--muted);
  font-size: 1.06rem;
}

.wide-figure {
  grid-column: 1 / -1;
  justify-self: center;
  width: min(920px, 100%);
  overflow: hidden;
  border-radius: var(--radius);
  background: #edf2ee;
  box-shadow: var(--shadow);
}

.wide-figure img {
  width: 100%;
}

.sensor-labels {
  grid-column: 1 / -1;
  justify-self: center;
  width: min(920px, 100%);
  display: grid;
  grid-template-columns: repeat(7, minmax(0, 1fr));
  gap: 8px;
}

.sensor-labels span {
  min-height: 40px;
  padding: 9px 8px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  font-size: clamp(0.68rem, 1.1vw, 0.83rem);
  font-weight: 760;
  text-align: center;
  overflow-wrap: anywhere;
}

.note {
  grid-column: 1 / -1;
  justify-self: center;
  width: min(920px, 100%);
  margin-bottom: 0;
  color: var(--teal-dark);
  font-weight: 760;
}

.task-grid,
.protocol-grid,
.resource-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.task-card,
.info-card,
.resource-card {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 12px 30px rgba(20, 31, 29, 0.07);
}

.task-image {
  display: block;
  width: 100%;
  height: 220px;
  object-fit: contain;
  object-position: center;
  background-color: #edf2ee;
}

.task-body,
.info-card,
.resource-card {
  padding: 24px;
}

.task-body p,
.info-card p,
.resource-card p {
  color: var(--muted);
}

.task-meta {
  margin-bottom: 14px;
  color: var(--teal-dark);
  font-weight: 800;
}

.protocols {
  width: min(1320px, calc(100% - 40px));
}

.protocol-figure {
  overflow: hidden;
  border-radius: var(--radius);
  background: #ffffff;
  box-shadow: var(--shadow);
}

.protocol-figure img {
  width: 100%;
}

.protocol-grid {
  margin-top: 18px;
}

.info-card {
  min-height: 184px;
}

.findings-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  align-items: stretch;
}

.chart {
  margin: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 12px 30px rgba(20, 31, 29, 0.07);
}

.chart figcaption {
  margin-bottom: 18px;
  color: var(--muted);
  font-weight: 800;
}

.result-figure {
  display: flex;
  flex-direction: column;
  min-height: 660px;
}

.result-figure img {
  flex: 1;
  width: 100%;
  height: 100%;
  object-fit: contain;
  object-position: center;
}

.finding-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 18px;
  margin: 22px 0;
  padding: 0;
  list-style: none;
}

.finding-list li {
  min-height: 78px;
  padding: 18px 18px 18px 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--muted);
  position: relative;
}

.finding-list li::before {
  content: "";
  position: absolute;
  top: 24px;
  left: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--teal);
}

.highlight {
  margin: 0;
  padding: 22px 24px;
  border-left: 6px solid var(--teal-dark);
  border-radius: var(--radius);
  background: var(--surface-strong);
  color: var(--teal-dark);
  font-size: 1.12rem;
  font-weight: 800;
}

.resource-card {
  min-height: 210px;
}

.text-link {
  display: inline-flex;
  margin-top: 6px;
  color: var(--teal-dark);
  font-weight: 850;
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.citation {
  margin-top: 48px;
  padding-top: 34px;
  border-top: 1px solid var(--line);
}

.citation h2 {
  font-size: clamp(1.8rem, 3vw, 3rem);
}

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

pre {
  overflow-x: auto;
  margin: 0;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #111a17;
  color: #f7fbf8;
  font-size: 0.95rem;
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
    flex-direction: column;
  }

  nav {
    justify-content: flex-start;
  }

  .hero,
  .narrative,
  .findings-layout {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: 0;
  }

  .result-figure {
    min-height: auto;
  }

  .numbers,
  .task-grid,
  .protocol-grid,
  .resource-grid,
  .finding-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .sensor-labels {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .site-header {
    position: static;
    padding: 16px 20px;
  }

  nav {
    gap: 8px 14px;
    font-size: 0.86rem;
  }

  .section,
  .protocols {
    width: min(360px, calc(100% - 28px));
    margin-left: 14px;
    margin-right: auto;
    padding: 48px 0;
  }

  .hero,
  .hero-copy,
  .hero-visual,
  .wide-figure,
  .protocol-figure,
  .section-heading,
  .narrative-copy,
    .authors,
    .button-row {
    max-width: min(360px, calc(100vw - 28px));
  }

  .hero {
    width: min(360px, calc(100vw - 28px));
    justify-items: stretch;
  }

  h1 {
    font-size: clamp(3.05rem, 16vw, 4.4rem);
  }

  .subtitle {
    font-size: 1.34rem;
    max-width: 100%;
  }

  h1,
  h2,
  h3,
  p,
  a,
  span {
    overflow-wrap: anywhere;
  }

  .numbers,
  .task-grid,
  .protocol-grid,
  .resource-grid,
  .finding-list,
  .sensor-labels {
    grid-template-columns: 1fr;
  }

  .metric {
    min-height: 112px;
  }

  .button-row {
    display: grid;
    grid-template-columns: 1fr;
  }

  .button {
    min-width: 0;
    padding-inline: 10px;
  }

  .chart {
    padding: 16px;
  }

  .result-figure img {
    max-height: none;
  }
}