:root {
  --ink: #20242a;
  --muted: #65707d;
  --line: #d9dee5;
  --paper: #fbfcfd;
  --surface: #ffffff;
  --accent: #0f766e;
  --accent-dark: #115e59;
  --gold: #c47b1b;
  --rose: #b93855;
  --shadow: 0 20px 60px rgba(22, 32, 45, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

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

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 0 7vw;
  border-bottom: 1px solid rgba(32, 36, 42, 0.08);
  background: rgba(251, 252, 253, 0.88);
  backdrop-filter: blur(18px);
}

.brand,
.nav,
.hero-actions,
.footer {
  display: flex;
  align-items: center;
}

.brand {
  gap: 10px;
  font-weight: 900;
}

.brand-mark {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: conic-gradient(from 40deg, var(--accent), var(--gold), var(--rose), var(--accent));
}

.nav {
  gap: 24px;
  color: var(--muted);
  font-size: 15px;
  font-weight: 500;
}

.nav a:hover {
  color: var(--accent-dark);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  align-items: end;
  gap: 48px;
  min-height: calc(100vh - 72px);
  padding: 12vh 7vw 8vh;
  color: #fff;
  background:
    linear-gradient(105deg, rgba(10, 33, 30, 0.94), rgba(10, 33, 30, 0.66) 52%, rgba(10, 33, 30, 0.24)),
    url("assets/hero-water.png") center / cover;
}

.hero-content {
  max-width: 820px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  margin: 0;
  max-width: 780px;
  font-size: clamp(46px, 7vw, 88px);
  line-height: 1.05;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 660px;
  margin: 24px 0 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: 20px;
}

.hero-actions {
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 20px;
  border-radius: 6px;
  font-weight: 700;
}

.button.primary {
  background: var(--gold);
  color: #111827;
}

.button.secondary {
  border: 1px solid rgba(255, 255, 255, 0.5);
  color: #fff;
}

.hero-panel {
  display: grid;
  gap: 18px;
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.hero-panel div {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.18);
}

.hero-panel div:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.panel-label {
  color: rgba(255, 255, 255, 0.68);
  min-width: 138px;
}

.hero-panel strong {
  text-align: right;
}

.section {
  padding: 92px 7vw;
}

.band {
  background: #eef3f4;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.2;
}

.overview-grid,
.metrics-grid,
.roadmap {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.info-card,
.metric-card,
.roadmap article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: 0 12px 34px rgba(22, 32, 45, 0.06);
}

.info-card {
  padding: 26px;
}

.card-index {
  color: var(--rose);
  font-weight: 900;
}

.info-card h3,
.timeline-item h3,
.roadmap h3 {
  margin: 10px 0 8px;
  font-size: 21px;
}

.info-card p,
.timeline-item p,
.roadmap p,
.publication p {
  margin: 0;
  color: var(--muted);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.timeline-item {
  position: relative;
  min-height: 230px;
  padding: 24px;
  border-top: 4px solid var(--line);
  background: #fff;
}

.timeline-item span {
  color: var(--muted);
  font-weight: 700;
}

.timeline-item.done {
  border-color: var(--accent);
}

.timeline-item.active {
  border-color: var(--gold);
  box-shadow: var(--shadow);
}

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

.metric-card {
  min-height: 170px;
  padding: 28px;
}

.metric-card strong {
  display: block;
  color: var(--accent-dark);
  font-size: 50px;
  line-height: 1;
}

.metric-card span {
  display: block;
  margin-top: 14px;
  color: var(--muted);
  font-weight: 700;
}

.roadmap article {
  padding: 26px;
}

.acknowledgment-section {
  background: #fff;
}

.acknowledgment-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  gap: 28px;
  align-items: stretch;
}

.acknowledgment-copy {
  padding: 30px;
  border-left: 4px solid var(--accent);
  background: #f7faf9;
}

.acknowledgment-copy p {
  margin: 0;
  color: var(--ink);
  font-size: 19px;
}

.acknowledgment-copy .disclaimer {
  margin-top: 16px;
  color: var(--muted);
  font-size: 15px;
}

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

.logo-card {
  display: flex;
  min-height: 210px;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 12px 34px rgba(22, 32, 45, 0.06);
  text-align: center;
}

.logo-card img {
  max-width: 150px;
  max-height: 104px;
  object-fit: contain;
}

.logo-card span {
  color: var(--muted);
  font-weight: 800;
}

.visual-section {
  background: #f7faf9;
}

.visual-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.figure-group-title {
  margin: 36px 0 16px;
  font-size: 24px;
  line-height: 1.25;
}

.section-heading + .figure-group-title {
  margin-top: 0;
}

.visual-card {
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 12px 34px rgba(22, 32, 45, 0.06);
}

.visual-card.wide {
  grid-row: span 1;
}

.visual-card img {
  display: block;
  width: 100%;
  max-height: 720px;
  height: auto;
  object-fit: contain;
  background: #fff;
}

.visual-card.wide img {
  max-height: 820px;
}

.visual-card figcaption {
  padding: 18px 20px 20px;
}

.visual-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 18px;
}

.visual-card span {
  display: block;
  color: var(--muted);
}

.image-credit {
  margin: 16px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.table-card {
  padding: 0;
}

.table-wrap {
  overflow-x: auto;
  padding: 22px;
}

.table-wrap table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  color: #111827;
  background: #fff;
  font-size: 17px;
}

.table-card .table-wrap table {
  min-width: 760px;
}

.table-wrap caption {
  caption-side: top;
  padding-bottom: 14px;
  color: var(--ink);
  font-size: 18px;
  font-weight: 900;
  text-align: left;
}

.table-wrap th,
.table-wrap td {
  padding: 12px 14px;
  border: 1px solid #c8c8c8;
  text-align: left;
}

.table-wrap thead th {
  border-top: 4px solid #111827;
  border-bottom: 3px solid #111827;
  font-weight: 900;
}

.table-wrap tbody tr:last-child td {
  border-bottom: 4px solid #111827;
}

.dataset-section {
  background: #fff;
}

.dataset-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(320px, 0.9fr);
  gap: 22px;
  align-items: stretch;
}

.dataset-summary,
.dataset-stats article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fbfb;
  box-shadow: 0 12px 34px rgba(22, 32, 45, 0.06);
}

.dataset-summary {
  padding: 30px;
}

.dataset-summary h3 {
  margin: 0 0 12px;
  font-size: 26px;
  line-height: 1.25;
}

.dataset-summary p {
  margin: 0;
  color: var(--muted);
}

.dataset-summary .dataset-note {
  margin-top: 12px;
}

.dataset-summary a {
  display: inline-flex;
  margin-top: 18px;
  color: var(--accent-dark);
  font-weight: 800;
}

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

.dataset-stats article {
  min-height: 132px;
  padding: 22px;
}

.dataset-stats strong {
  display: block;
  color: var(--rose);
  font-size: 36px;
  line-height: 1;
}

.dataset-stats span {
  display: block;
  margin-top: 12px;
  color: var(--muted);
  font-weight: 700;
}

.dataset-sources {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.dataset-sources span {
  padding: 8px 12px;
  border: 1px solid rgba(15, 118, 110, 0.22);
  border-radius: 999px;
  color: var(--accent-dark);
  background: rgba(15, 118, 110, 0.06);
  font-size: 14px;
  font-weight: 800;
}

.dataset-figures {
  margin-top: 42px;
}

.publication-section {
  padding-top: 72px;
}

.publication {
  max-width: 920px;
  padding: 28px;
  margin-bottom: 18px;
  border-left: 4px solid var(--accent);
  background: #fff;
  box-shadow: 0 12px 34px rgba(22, 32, 45, 0.06);
}

.publication h3 {
  margin: 0 0 10px;
  font-size: 24px;
}

.publication a {
  display: inline-flex;
  margin-top: 16px;
  color: var(--accent-dark);
  font-weight: 800;
}

.footer {
  justify-content: space-between;
  gap: 20px;
  padding: 28px 7vw;
  color: var(--muted);
  border-top: 1px solid var(--line);
  background: #fff;
}

@media (max-width: 960px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    gap: 8px;
    padding: 14px 6vw;
  }

  .nav {
    width: 100%;
    gap: 14px;
    overflow-x: auto;
    padding-bottom: 2px;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    padding: 90px 6vw 56px;
  }

  .overview-grid,
  .timeline,
  .metrics-grid,
  .roadmap,
  .visual-grid,
  .dataset-layout,
  .acknowledgment-layout {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .visual-grid,
  .dataset-layout,
  .acknowledgment-layout {
    grid-template-columns: 1fr;
  }

  .visual-card.wide {
    grid-row: span 1;
  }

}

@media (max-width: 620px) {
  .hero h1 {
    font-size: 40px;
  }

  .hero-copy {
    font-size: 17px;
  }

  .section {
    padding: 68px 6vw;
  }

  .overview-grid,
  .timeline,
  .metrics-grid,
  .roadmap,
  .dataset-stats,
  .logo-grid {
    grid-template-columns: 1fr;
  }

  .footer {
    align-items: flex-start;
    flex-direction: column;
  }
}