:root {
  color-scheme: light;
  --ink: #142326;
  --muted: #5f6f73;
  --line: #d8e4e0;
  --paper: #fbfbf8;
  --surface: #ffffff;
  --aqua: #1d9a9c;
  --aqua-dark: #09656b;
  --coral: #ef765d;
  --gold: #d8a332;
  --green: #5e8e5a;
  --shadow: 0 22px 70px rgba(25, 48, 51, 0.12);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 5%, rgba(29, 154, 156, 0.08), transparent 28rem),
    radial-gradient(circle at 82% 24%, rgba(239, 118, 93, 0.08), transparent 24rem),
    var(--paper);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  line-height: 1.55;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  padding: 0.9rem clamp(1rem, 4vw, 3rem);
  background: rgba(251, 251, 248, 0.86);
  border-bottom: 1px solid rgba(20, 35, 38, 0.08);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  min-width: 0;
  gap: 0.75rem;
  text-decoration: none;
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 1rem;
}

.brand small {
  color: var(--muted);
  font-size: 0.76rem;
}

.brand-mark {
  width: 2.35rem;
  height: 2.35rem;
  flex: 0 0 auto;
  border-radius: 50%;
  background:
    radial-gradient(circle at 52% 47%, var(--surface) 0 23%, transparent 24%),
    conic-gradient(from 140deg, var(--aqua), var(--coral), var(--gold), var(--aqua));
  box-shadow: 0 8px 20px rgba(29, 154, 156, 0.22);
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

.nav-tab,
.github-link,
.button {
  min-height: 2.5rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  cursor: pointer;
}

.nav-tab {
  padding: 0 1rem;
  color: var(--muted);
  background: transparent;
}

.nav-tab.is-active {
  color: var(--ink);
  background: var(--surface);
  border-color: rgba(20, 35, 38, 0.08);
  box-shadow: 0 10px 26px rgba(20, 35, 38, 0.08);
}

.github-link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0 1rem;
  color: var(--surface);
  background: var(--ink);
}

.github-link svg {
  width: 1.05rem;
  height: 1.05rem;
  fill: currentColor;
}

.tab-panel {
  display: none;
}

.tab-panel.is-active {
  display: block;
}

.section-band {
  padding: clamp(3rem, 8vw, 6.5rem) clamp(1rem, 5vw, 5rem);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(22rem, 0.92fr);
  align-items: center;
  gap: clamp(2rem, 5vw, 5rem);
  min-height: calc(100vh - 74px);
}

.hero-copy,
.about-hero > div {
  max-width: 46rem;
}

.eyebrow {
  margin: 0 0 0.85rem;
  color: var(--aqua-dark);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

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

h1 {
  margin-bottom: 1.15rem;
  font-size: clamp(3rem, 8vw, 6.6rem);
  line-height: 0.93;
  letter-spacing: 0;
  overflow-wrap: break-word;
  text-wrap: balance;
}

h2 {
  margin-bottom: 1rem;
  font-size: clamp(2rem, 4vw, 3.8rem);
  line-height: 1;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 0.6rem;
  font-size: 1.1rem;
  line-height: 1.2;
}

.hero-lede,
.about-hero p {
  max-width: 42rem;
  color: #385053;
  font-size: clamp(1.1rem, 2vw, 1.42rem);
}

.hero-actions,
.link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 1.25rem;
}

.button.primary {
  color: var(--surface);
  background: var(--aqua-dark);
  box-shadow: 0 16px 34px rgba(9, 101, 107, 0.22);
}

.button.secondary {
  color: var(--ink);
  background: var(--surface);
  border-color: var(--line);
}

.hero-visual {
  position: relative;
  overflow: hidden;
  min-height: 30rem;
  border: 1px solid rgba(20, 35, 38, 0.08);
  border-radius: 8px;
  background: linear-gradient(160deg, #f7fffd 0%, #eef7f5 48%, #fff3ed 100%);
  box-shadow: var(--shadow);
}

.hero-visual canvas {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 30rem;
}

.visual-metrics {
  position: absolute;
  right: 1rem;
  bottom: 1rem;
  left: 1rem;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
}

.visual-metrics span {
  min-width: 0;
  padding: 0.75rem;
  color: #2e4648;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(20, 35, 38, 0.08);
  border-radius: 8px;
  backdrop-filter: blur(10px);
  font-size: 0.82rem;
}

.visual-metrics strong {
  display: block;
  color: var(--ink);
  font-size: 1.15rem;
}

.summary-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin: 0 clamp(1rem, 5vw, 5rem) clamp(2rem, 6vw, 4.5rem);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.project-facts {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  padding: 0 clamp(1rem, 5vw, 5rem) clamp(2rem, 5vw, 4rem);
}

.project-facts article {
  padding: 1rem;
  border-left: 3px solid var(--aqua);
  background: rgba(255, 255, 255, 0.58);
}

.project-facts article:nth-child(2) {
  border-color: var(--coral);
}

.project-facts article:nth-child(3) {
  border-color: var(--gold);
}

.project-facts article:nth-child(4) {
  border-color: var(--green);
}

.project-facts span {
  display: block;
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.project-facts strong {
  display: block;
  margin-top: 0.35rem;
  line-height: 1.25;
}

.summary-strip article {
  padding: clamp(1.2rem, 3vw, 2rem);
  background: rgba(255, 255, 255, 0.82);
}

.summary-strip span,
.timeline span,
.roadmap span,
.paper-list span,
.presence-grid a,
.card-index {
  color: var(--aqua-dark);
  font-size: 0.78rem;
  font-weight: 900;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.summary-strip p,
.feature-card p,
.timeline p,
.roadmap p,
.person-card p,
.presence-grid p {
  color: var(--muted);
}

.content-section {
  padding: clamp(3.5rem, 8vw, 6rem) clamp(1rem, 5vw, 5rem);
}

.section-heading {
  max-width: 56rem;
  margin-bottom: clamp(1.7rem, 4vw, 3rem);
}

.two-column {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.4rem, 4vw, 4rem);
  max-width: 74rem;
  color: #385053;
  font-size: 1.05rem;
}

.split-feature,
.metrics-section,
.presence-section,
.risks-section {
  background: #f3f7f4;
}

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

.feature-card,
.person-card,
.presence-grid article {
  padding: clamp(1.25rem, 3vw, 1.75rem);
  border: 1px solid rgba(20, 35, 38, 0.1);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.84);
  box-shadow: 0 18px 40px rgba(20, 35, 38, 0.07);
}

.feature-card:nth-child(2) .card-index,
.roadmap article:nth-child(2n) span {
  color: #a94d39;
}

.feature-card:nth-child(3) .card-index,
.roadmap article:nth-child(3n) span {
  color: #8a650b;
}

.feature-card:nth-child(4) .card-index,
.roadmap article:nth-child(4n) span {
  color: #477544;
}

.timeline,
.roadmap,
.paper-list {
  display: grid;
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--line);
}

.timeline {
  grid-template-columns: repeat(3, 1fr);
}

.timeline article,
.roadmap article,
.paper-list a {
  padding: clamp(1.2rem, 3vw, 1.75rem);
  background: rgba(255, 255, 255, 0.88);
}

.metrics-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.metrics-grid article {
  display: flex;
  min-height: 12rem;
  flex-direction: column;
  justify-content: space-between;
  padding: clamp(1.2rem, 3vw, 1.6rem);
  color: var(--surface);
  border-radius: 8px;
  background: var(--ink);
}

.metrics-grid article:nth-child(2) {
  background: var(--aqua-dark);
}

.metrics-grid article:nth-child(3) {
  background: #8c4a37;
}

.metrics-grid article:nth-child(4) {
  background: #5f501d;
}

.metrics-grid strong {
  font-size: clamp(2.4rem, 6vw, 4rem);
  line-height: 1;
}

.metrics-grid span {
  color: rgba(255, 255, 255, 0.78);
  font-size: 0.94rem;
}

.roadmap {
  grid-template-columns: repeat(3, 1fr);
}

.outcome-section {
  display: grid;
  grid-template-columns: minmax(18rem, 0.75fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 5vw, 5rem);
  align-items: start;
}

.outcome-copy {
  color: #385053;
  font-size: 1.06rem;
}

.about-hero {
  min-height: 45vh;
  display: flex;
  align-items: center;
  background:
    linear-gradient(90deg, rgba(251, 251, 248, 0.95), rgba(251, 251, 248, 0.7)),
    radial-gradient(circle at 80% 35%, rgba(29, 154, 156, 0.22), transparent 20rem),
    radial-gradient(circle at 88% 58%, rgba(239, 118, 93, 0.22), transparent 17rem);
}

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

.person-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.2rem;
}

.person-header h2 {
  margin-bottom: 0.2rem;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
}

.person-header p {
  margin: 0;
}

.avatar {
  display: inline-flex;
  width: 4rem;
  height: 4rem;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  color: var(--surface);
  border-radius: 50%;
  background: var(--aqua-dark);
  font-weight: 900;
}

.avatar.alt {
  background: #8c4a37;
}

.link-row a {
  padding: 0.62rem 0.85rem;
  color: var(--aqua-dark);
  border: 1px solid rgba(9, 101, 107, 0.18);
  border-radius: 999px;
  background: #f7fffd;
  font-size: 0.9rem;
  font-weight: 800;
  text-decoration: none;
}

.paper-list a {
  display: block;
  text-decoration: none;
}

.paper-list strong {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 1.04rem;
}

.paper-list span {
  display: block;
  color: var(--muted);
  text-transform: none;
  letter-spacing: 0;
}

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

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

.risk-grid article {
  padding: clamp(1.25rem, 3vw, 1.75rem);
  border-top: 4px solid var(--coral);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
}

.risk-grid article:nth-child(2) {
  border-color: var(--aqua);
}

.risk-grid article:nth-child(3) {
  border-color: var(--green);
}

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

.presence-grid a {
  text-decoration: none;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.3rem clamp(1rem, 5vw, 5rem);
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.site-footer span:first-child {
  color: var(--ink);
  font-weight: 900;
}

@media (max-width: 1020px) {
  .hero,
  .outcome-section,
  .people-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

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

  .timeline,
  .roadmap,
  .presence-grid,
  .project-facts,
  .risk-grid,
  .summary-strip {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .primary-nav {
    width: 100%;
  }

  .nav-tab,
  .github-link {
    flex: 1;
    justify-content: center;
    padding-inline: 0.55rem;
  }

  .github-link span {
    display: none;
  }

  h1 {
    font-size: clamp(2.25rem, 10.5vw, 3rem);
    line-height: 0.98;
  }

  .hero-visual,
  .hero-visual canvas {
    min-height: 24rem;
  }

  .visual-metrics,
  .stack-grid,
  .metrics-grid,
  .two-column {
    grid-template-columns: 1fr;
  }

  .metrics-grid article {
    min-height: 9rem;
  }

  .site-footer {
    flex-direction: column;
  }
}