:root {
  --bg-top: #f4f7fb;
  --bg-bottom: #e0e8f2;
  --paper: rgba(255, 255, 255, 0.88);
  --ink: #182433;
  --muted: #5f6b7d;
  --accent: #2457a6;
  --accent-strong: #163f7f;
  --accent-soft: #dce7f7;
  --line: rgba(24, 36, 51, 0.11);
  --shadow: 0 24px 70px rgba(33, 52, 84, 0.14);
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(36, 87, 166, 0.16), transparent 26%),
    radial-gradient(circle at top right, rgba(117, 151, 205, 0.14), transparent 24%),
    linear-gradient(180deg, var(--bg-top), var(--bg-bottom) 74%, #d4dde9);
}

a {
  color: var(--accent-strong);
}

.site-shell {
  width: min(var(--max-width), calc(100vw - 28px));
  margin: 0 auto;
  padding: 18px 0 40px;
}

.site-topbar,
.hero-card,
.content-card,
.feature-card,
.footer-card,
.path-card,
.resource-card,
.note-band {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.site-topbar {
  display: flex;
  gap: 18px;
  align-items: center;
  justify-content: space-between;
  padding: 18px 22px;
  margin-bottom: 20px;
}

.brand-block {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.brand-mark {
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.76rem;
}

.brand-block a {
  color: var(--ink);
  text-decoration: none;
  font-size: 1.5rem;
  font-weight: 700;
}

.brand-summary {
  margin: 0;
  color: var(--muted);
  font-size: 0.94rem;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  justify-content: flex-end;
}

.site-nav a,
.button-link,
.button-link-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  border-radius: 999px;
  padding: 11px 16px;
  text-decoration: none;
  font-size: 0.95rem;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.site-nav a,
.button-link-secondary {
  color: var(--ink);
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.72);
}

.site-nav a {
  color: white;
  background: linear-gradient(180deg, var(--accent), var(--accent-strong));
  border: 1px solid transparent;
  box-shadow: 0 10px 24px rgba(36, 87, 166, 0.2);
}

.button-link {
  color: white;
  background: var(--accent);
  border: 1px solid transparent;
}

.site-nav a:hover,
.button-link:hover,
.button-link-secondary:hover {
  transform: translateY(-1px);
}

.site-nav a:hover {
  background: linear-gradient(180deg, #2b61b4, #18478f);
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid #f0b24b;
  outline-offset: 3px;
}

.hero-card {
  padding: 34px;
  margin-bottom: 22px;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.94), rgba(237, 243, 252, 0.92)),
    var(--paper);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.8rem;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.9fr);
  gap: 24px;
  align-items: start;
}

.hero-card h1 {
  margin: 0 0 14px;
  font-size: clamp(2rem, 4vw, 2.6rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.hero-card .lede,
.content-card p,
.feature-card p,
.path-card p,
.resource-card p,
.footer-card p,
.note-band p,
.roadmap-phase li {
  color: var(--muted);
  line-height: 1.62;
  font-size: 1.02rem;
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 20px;
}

.stat-grid,
.feature-grid,
.path-grid,
.resource-grid {
  display: grid;
  gap: 16px;
}

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

.stat-card {
  padding: 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(231, 239, 250, 0.9));
}

.stat-card strong {
  display: block;
  font-size: 1.8rem;
  margin-bottom: 6px;
}

.stat-card span {
  color: var(--muted);
}

.content-card,
.note-band,
.footer-card {
  padding: 26px;
  margin-bottom: 18px;
}

.section-heading {
  margin: 0 0 14px;
  font-size: clamp(1.55rem, 2.6vw, 1.95rem);
}

.section-kicker {
  margin: 0 0 10px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card,
.path-card,
.resource-card {
  padding: 22px;
}

.platform-card {
  position: relative;
  border-top: 4px solid var(--accent-soft);
}

.platform-card--population-genetics {
  border-top-color: #5f88d6;
}

.platform-card--ecology {
  border-top-color: #4d8a63;
}

.platform-card--artificial-life {
  border-top-color: #8a6a42;
}

.platform-card--research-support {
  border-top-color: #6a62a8;
}

.platform-card-category {
  margin: 0 0 12px;
  color: var(--accent-strong);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.74rem;
  font-weight: 700;
}

.platform-open-link {
  min-width: 104px;
  font-weight: 700;
  box-shadow: 0 10px 24px rgba(36, 87, 166, 0.22);
}

.platform-open-link:hover {
  background: var(--accent-strong);
}

.feature-card h3,
.path-card h3,
.resource-card h3 {
  margin: 0 0 10px;
  font-size: 1.28rem;
}

.api-reference {
  display: grid;
  gap: 16px;
}

.api-endpoint {
  padding: 20px 22px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(232, 239, 249, 0.88));
}

.api-endpoint-header {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 14px;
  align-items: baseline;
  margin-bottom: 10px;
}

.api-endpoint-header h3 {
  margin: 0;
  font-size: 1.24rem;
}

.api-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.api-signature {
  margin: 12px 0;
  padding: 14px 16px;
  border-radius: 16px;
  background: #f5f8fd;
  border: 1px solid rgba(36, 87, 166, 0.15);
  overflow-x: auto;
}

.api-signature code {
  font-size: 0.95rem;
  line-height: 1.6;
}

.api-meta {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 18px;
}

.api-meta strong {
  display: block;
  margin-bottom: 4px;
}

.api-meta span,
.api-endpoint p,
.api-endpoint li {
  color: var(--muted);
}

.api-meta code {
  white-space: normal;
  word-break: break-word;
}

.lede-strong {
  font-size: 1.08rem;
  color: var(--ink);
  line-height: 1.68;
}

.mission-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.mission-card {
  padding: 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(238, 243, 250, 0.92));
}

.mission-card h3 {
  margin: 0 0 8px;
  font-size: 1.12rem;
}

.mission-card p {
  margin: 0;
}

.notebook-shell {
  max-width: 920px;
}

.section-card {
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
}

.meta {
  font-size: 0.92rem;
  color: var(--muted);
  margin: 0.3rem 0;
}

.excerpt {
  color: var(--ink);
  margin: 0.6rem 0;
}

.content {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.content[hidden] {
  display: none;
}

.meta-list,
.plain-list {
  margin: 12px 0 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.6;
}

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

.resource-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.note-band {
  background: linear-gradient(135deg, rgba(36, 87, 166, 0.12), rgba(220, 231, 247, 0.84));
}

.inline-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.info-card {
  padding: 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(238, 243, 250, 0.92));
}

.info-card h3 {
  margin: 0 0 10px;
  font-size: 1.12rem;
}

.info-card p,
.info-card li {
  color: var(--muted);
  line-height: 1.6;
}

.app-frame-card {
  padding: 0;
  overflow: hidden;
}

.app-frame-header {
  padding: 22px 22px 14px;
}

.app-frame {
  width: 100%;
  min-height: 840px;
  border: 0;
  display: block;
  background: white;
}

.callout-card {
  padding: 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(220, 231, 247, 0.46);
}

.family-note {
  margin-top: 16px;
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.95), rgba(238, 243, 250, 0.88));
}

.family-note p {
  margin: 0;
}

.roadmap-phase {
  padding-left: 20px;
}

.roadmap-phase li + li {
  margin-top: 8px;
}

.footer-card {
  display: flex;
  gap: 18px;
  align-items: start;
  justify-content: space-between;
}

.footer-card small {
  color: var(--muted);
}

.redirect-card {
  max-width: 720px;
  margin: 7vh auto;
}

@media (max-width: 980px) {
  .hero-grid,
  .feature-grid,
  .info-grid,
  .path-grid,
  .resource-grid,
  .mission-grid {
    grid-template-columns: 1fr;
  }

  .site-topbar,
  .footer-card {
    flex-direction: column;
    align-items: stretch;
  }

  .site-nav {
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .site-shell {
    width: min(var(--max-width), calc(100vw - 18px));
    padding-top: 10px;
  }

  .site-topbar,
  .hero-card,
  .content-card,
  .feature-card,
  .path-card,
  .resource-card,
  .footer-card,
  .note-band {
    border-radius: 20px;
  }

  .hero-card,
  .content-card,
  .feature-card,
  .path-card,
  .resource-card,
  .footer-card,
  .note-band {
    padding: 20px;
  }

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

  .api-meta {
    grid-template-columns: 1fr;
  }
}