:root {
  color-scheme: dark;
  --ink: #071014;
  --ink-soft: #0c191e;
  --cream: #ecf0e6;
  --cream-dim: #acbab4;
  --line: rgba(186, 215, 204, 0.18);
  --line-strong: rgba(186, 215, 204, 0.34);
  --mint: #72e9c1;
  --amber: #e7be70;
  --display: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia, serif;
  --sans: "Avenir Next", Avenir, "Century Gothic", "Trebuchet MS", sans-serif;
  --mono: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  background: var(--ink);
  color: var(--cream);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
}

a:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 4px;
}

.skip-link {
  position: fixed;
  top: 1rem;
  left: 1rem;
  z-index: 10;
  padding: 0.7rem 1rem;
  border: 1px solid var(--mint);
  background: var(--ink);
  color: var(--mint);
  font: 700 0.72rem/1 var(--sans);
  text-decoration: none;
  text-transform: uppercase;
  transform: translateY(-180%);
}

.skip-link:focus {
  transform: translateY(0);
}

.shell {
  width: min(1040px, calc(100% - 3rem));
  margin-inline: auto;
}

.sky {
  position: fixed;
  z-index: -1;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.sky::after {
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 180 180' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='.15'/%3E%3C/svg%3E");
  content: "";
  opacity: 0.2;
  mix-blend-mode: soft-light;
}

.sky__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(144, 190, 175, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(144, 190, 175, 0.04) 1px, transparent 1px);
  background-size: 72px 72px;
}

.sky__glow {
  position: absolute;
  top: -24rem;
  right: -18rem;
  width: 58rem;
  height: 58rem;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(26, 125, 104, 0.2), transparent 65%);
}

.star {
  position: absolute;
  width: 2px;
  height: 2px;
  border-radius: 50%;
  background: var(--cream);
  box-shadow: 0 0 9px 1px rgba(236, 240, 230, 0.6);
}

.star--one { top: 14%; left: 11%; }
.star--two { top: 8%; right: 15%; opacity: 0.55; }
.star--three { top: 48%; right: 5%; opacity: 0.3; }

.masthead {
  display: flex;
  align-items: center;
  min-height: 92px;
  border-bottom: 1px solid var(--line);
}

.brand {
  font-size: 1.2rem;
  font-weight: 400;
  letter-spacing: 0.11em;
  text-decoration: none;
}

.brand strong {
  color: var(--mint);
}

.parking {
  padding-block: clamp(4rem, 8vw, 7rem) 6rem;
}

.notice {
  max-width: 760px;
  animation: appear 500ms ease-out both;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--mint);
  font: 700 0.66rem/1.4 var(--mono);
  letter-spacing: 0.17em;
  text-transform: uppercase;
}

.notice h1 {
  margin: 0;
  font: 400 clamp(3.4rem, 7vw, 6.4rem)/0.95 var(--display);
  letter-spacing: -0.055em;
}

.notice__copy {
  max-width: 690px;
  margin: 1.7rem 0 0;
  color: var(--cream-dim);
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.75;
}

.datasets-button {
  display: inline-flex;
  gap: 1.4rem;
  align-items: center;
  justify-content: space-between;
  min-height: 47px;
  margin-top: 1.7rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--mint);
  background: var(--mint);
  color: #061310;
  font: 700 0.68rem/1 var(--sans);
  letter-spacing: 0.04em;
  text-decoration: none;
  transition: background 160ms ease, transform 160ms ease;
}

.datasets-button:hover {
  background: #93f5d4;
  transform: translateY(-2px);
}

.datasets {
  margin-top: clamp(4.5rem, 9vw, 7rem);
  border-top: 1px solid var(--line-strong);
}

.datasets__heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 1.4rem;
  border-bottom: 1px solid var(--line);
}

.datasets__heading h2 {
  margin: 0;
  font: 400 clamp(1.8rem, 4vw, 2.7rem)/1 var(--display);
  letter-spacing: -0.025em;
}

.datasets__heading p {
  margin: 0;
  color: var(--cream-dim);
  font: 500 0.6rem/1 var(--mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.dataset {
  display: grid;
  grid-template-columns: 70px minmax(260px, 1fr) minmax(260px, 0.72fr);
  gap: 1.5rem;
  align-items: center;
  min-height: 162px;
  padding-block: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.dataset__meta {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  color: var(--cream-dim);
  font: 500 0.61rem/1 var(--mono);
  letter-spacing: 0.1em;
}

.dataset__meta span {
  color: var(--mint);
}

.dataset--amber .dataset__meta span {
  color: var(--amber);
}

.dataset__description p {
  margin: 0 0 0.4rem;
  color: var(--cream-dim);
  font: 600 0.6rem/1 var(--mono);
  letter-spacing: 0.13em;
  text-transform: uppercase;
}

.dataset__description h3 {
  margin: 0;
  font: 400 clamp(1.7rem, 3.2vw, 2.5rem)/1.05 var(--display);
  letter-spacing: -0.025em;
}

.dataset__description > span {
  display: block;
  max-width: 440px;
  margin-top: 0.55rem;
  color: var(--cream-dim);
  font-size: 0.82rem;
}

.dataset__links {
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  align-items: flex-start;
}

.archive-link {
  width: 100%;
  padding: 0.75rem 0.85rem;
  border: 1px solid var(--line-strong);
  font: 600 0.67rem/1.35 var(--mono);
  text-decoration: none;
  transition: border-color 160ms ease, color 160ms ease, background 160ms ease;
}

.archive-link small {
  display: block;
  margin-bottom: 0.2rem;
  color: var(--cream-dim);
  font-size: 0.54rem;
  font-weight: 500;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}

.archive-link:hover {
  border-color: var(--mint);
  background: rgba(114, 233, 193, 0.05);
  color: var(--mint);
}

.dataset--amber .archive-link:hover {
  border-color: var(--amber);
  background: rgba(231, 190, 112, 0.05);
  color: var(--amber);
}

.paper-link {
  color: var(--cream-dim);
  font: 600 0.62rem/1 var(--mono);
  text-decoration-color: transparent;
  text-underline-offset: 0.3em;
}

.paper-link:hover {
  color: var(--cream);
  text-decoration-color: currentColor;
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 105px;
  border-top: 1px solid var(--line);
  color: var(--cream-dim);
  font: 600 0.61rem/1.4 var(--mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer p {
  margin: 0;
}

.footer__links {
  display: flex;
  gap: 1.5rem;
}

.footer a {
  text-decoration: none;
}

.footer a:hover {
  color: var(--mint);
}

@keyframes appear {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 760px) {
  .shell {
    width: min(100% - 2rem, 1040px);
  }

  .masthead {
    min-height: 84px;
  }

  .brand {
    font-size: 1rem;
  }

  .parking {
    padding-block: 4rem;
  }

  .notice h1 {
    font-size: clamp(3.2rem, 15vw, 5rem);
  }

  .datasets__heading {
    display: block;
  }

  .datasets__heading p {
    margin-top: 0.75rem;
    line-height: 1.5;
  }

  .dataset {
    grid-template-columns: 45px 1fr;
    gap: 1rem;
    padding-block: 1.8rem;
  }

  .dataset__links {
    grid-column: 2;
    margin-top: 0.3rem;
  }

  .footer {
    display: block;
    padding-block: 1.8rem;
  }

  .footer__links {
    flex-direction: column;
    gap: 0.6rem;
    margin-top: 1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}