:root {
  --surface: oklch(98.8% 0.004 70);
  --surface-muted: oklch(96.2% 0.006 70);
  --surface-blue: oklch(94.5% 0.025 250);
  --ink: oklch(19% 0.012 265);
  --ink-soft: oklch(44% 0.015 265);
  --line: oklch(87% 0.008 265);
  --blue: oklch(59% 0.18 255);
  --blue-dark: oklch(48% 0.17 255);
  --yellow: oklch(85% 0.16 88);
  --red: oklch(67% 0.17 30);
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.75rem;
  --space-lg: 1rem;
  --space-xl: 1.5rem;
  --space-2xl: 2rem;
  --space-3xl: 3rem;
  --space-4xl: 4rem;
  --space-5xl: 6rem;
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-pill: 999px;
  --font-display: "Hanken Grotesk", "Helvetica Neue", sans-serif;
  --font-reading: "Source Serif 4", Georgia, serif;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  min-width: 20rem;
  scroll-behavior: smooth;
  background: var(--surface);
  color: var(--ink);
  font-family: var(--font-display);
  font-kerning: normal;
}

body {
  min-height: 100svh;
  margin: 0;
  overflow-x: hidden;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: var(--space-md);
  left: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-sm);
  background: var(--ink);
  color: var(--surface);
  font-weight: 700;
  transform: translateY(-200%);
}

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

.site-header,
.site-footer {
  width: min(100% - 2rem, 90rem);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
}

.site-header {
  min-height: 4.5rem;
  padding-block: var(--space-md);
}

.brand {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-name {
  min-height: 2.75rem;
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}

.brand-mark {
  position: relative;
  width: 1.8rem;
  height: 1.8rem;
  padding: 0;
  display: grid;
  place-items: center;
  border: 2px solid var(--ink);
  border-radius: 0.28rem;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font-family: var(--font-reading);
  font-size: 1rem;
  font-weight: 600;
  line-height: 1;
  transform: rotate(-3deg);
  transition: background-color 160ms ease-out, transform 120ms ease-out;
}

.brand-mark:active {
  transform: rotate(-3deg) scale(0.92);
}

.brand-mark:focus-visible {
  outline: 3px solid color-mix(in oklch, var(--blue) 35%, transparent);
  outline-offset: 4px;
}

.brand-mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 1.5rem;
  height: 1.5rem;
  border: 2px solid var(--blue);
  border-radius: 50%;
  opacity: 0;
  pointer-events: none;
}

.brand-mark.is-celebrating::after {
  animation: firework-ring 420ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.brand-mark.is-celebrating .brand-letter {
  animation: letter-pop 300ms cubic-bezier(0.16, 1, 0.3, 1);
}

.firework-particle {
  position: absolute;
  z-index: 2;
  left: 50%;
  top: 50%;
  width: 0.34rem;
  height: 0.34rem;
  margin: -0.17rem;
  border-radius: 50%;
  background: var(--particle-color);
  opacity: 0;
  pointer-events: none;
  animation: firework-burst 440ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.hero {
  position: relative;
  width: min(100% - 2rem, 78rem);
  min-height: calc(100svh - 4.5rem);
  margin-inline: auto;
  padding-block: var(--space-3xl);
  display: grid;
  align-content: center;
  justify-items: center;
  gap: var(--space-xl);
  text-align: center;
}

.hero-kicker {
  padding: 0.4rem var(--space-md);
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--surface-muted);
  color: var(--ink-soft);
  font-size: 0.82rem;
  font-weight: 600;
}

.kicker-icon {
  color: var(--blue);
}

h1 {
  max-width: 22ch;
  margin: 0;
  font-size: clamp(2.45rem, 6.2vw, 5.4rem);
  font-weight: 800;
  letter-spacing: -0.058em;
  line-height: 0.98;
  text-wrap: balance;
}

h1 span {
  color: var(--ink-soft);
}

.authors {
  max-width: 70rem;
  display: grid;
  gap: var(--space-md);
}

.authors p {
  margin: 0;
}

.authors > p:first-child {
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  line-height: 1.65;
}

.authors sup {
  margin-left: 0.08em;
  font-size: 0.65em;
  font-weight: 600;
}

.affiliations {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-lg);
  color: var(--ink-soft);
  font-size: 0.82rem;
  line-height: 1.45;
}

.author-note {
  color: var(--ink-soft);
  font-size: 0.75rem;
  font-weight: 500;
}

.actions {
  margin-top: var(--space-md);
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.action-button {
  min-height: 3.25rem;
  padding: var(--space-md) var(--space-xl);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font: inherit;
  font-weight: 700;
  text-decoration: none;
  transition: background-color 180ms ease-out, border-color 180ms ease-out, transform 180ms ease-out;
}

.action-button svg {
  width: 1.15rem;
  height: 1.15rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.8;
}

.action-button-resource {
  border-color: var(--resource-color);
  background: var(--resource-color);
  color: var(--surface);
}

.action-button-resource > span {
  margin-left: var(--space-xs);
  font-size: 1.1rem;
}

.action-button-resource:focus-visible {
  outline: 3px solid color-mix(in oklch, var(--resource-color) 35%, transparent);
  outline-offset: 4px;
}

.action-button-paper {
  --resource-color: var(--blue);
  --resource-hover-color: var(--blue-dark);
}

.action-button-dataset {
  --resource-color: var(--blue);
  --resource-hover-color: var(--blue-dark);
}

.action-button-disabled {
  border-color: var(--line);
  background: var(--surface-muted);
  color: var(--ink-soft);
  cursor: not-allowed;
}

.action-button-disabled span {
  padding-left: var(--space-sm);
  border-left: 1px solid var(--line);
  font-size: 0.72rem;
  font-weight: 600;
}

.hero-sketch {
  position: absolute;
  z-index: -1;
  right: 0;
  bottom: 1rem;
  width: 9rem;
  height: 7rem;
  transform: rotate(-6deg);
}

.sketch-orbit {
  position: absolute;
  inset: 1rem;
  border: 2px solid var(--ink);
  border-radius: 50%;
  transform: skewX(-18deg);
}

.sketch-line {
  position: absolute;
  top: 3.2rem;
  left: 0.6rem;
  width: 8rem;
  border-top: 2px solid var(--ink);
  transform: rotate(20deg);
}

.sketch-dot {
  position: absolute;
  z-index: 1;
  width: 1.1rem;
  height: 1.1rem;
  border-radius: 50%;
}

.sketch-dot-one {
  top: 0.9rem;
  right: 1.6rem;
  background: var(--yellow);
}

.sketch-dot-two {
  bottom: 0.8rem;
  left: 1.4rem;
  background: var(--red);
}

.abstract-section {
  width: min(100% - 2rem, 78rem);
  margin: 0 auto var(--space-5xl);
  padding: clamp(var(--space-2xl), 5vw, var(--space-4xl));
  display: grid;
  gap: var(--space-3xl);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface-blue);
}

.abstract-heading {
  align-self: start;
  display: grid;
  gap: var(--space-md);
}

.abstract-heading > p {
  margin: 0;
  color: var(--blue-dark);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h2 {
  margin: 0;
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  letter-spacing: -0.045em;
  line-height: 1.05;
}

.abstract-copy {
  max-width: none;
  display: grid;
  gap: var(--space-xl);
  font-family: var(--font-reading);
  font-size: 0.925rem;
  line-height: 1.72;
}

.abstract-copy p {
  margin: 0;
}

.site-footer {
  min-height: 5rem;
  padding-block: var(--space-lg);
  border-top: 1px solid var(--line);
  color: var(--ink-soft);
  font-size: 0.78rem;
}

.last-updated {
  margin-left: auto;
  text-align: right;
}

@media (min-width: 48rem) {
  .site-header,
  .site-footer {
    width: min(100% - 4rem, 90rem);
  }

  .hero,
  .abstract-section {
    width: min(100% - 4rem, 78rem);
  }

}

@media (max-width: 39rem) {
  .hero {
    padding-top: var(--space-4xl);
  }

  .actions,
  .action-button {
    width: 100%;
  }

  .hero-sketch {
    right: 0;
    bottom: 0;
    opacity: 0.5;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
  }

  .last-updated {
    align-self: flex-end;
  }
}

@media (hover: hover) {
  .action-button-resource:hover {
    border-color: var(--resource-hover-color);
    background: var(--resource-hover-color);
    transform: translateY(-2px);
  }

  .brand-mark:hover {
    background: var(--surface-blue);
  }
}

@media (pointer: coarse) {
  .action-button {
    min-height: 3.5rem;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .hero > * {
    opacity: 0;
    animation: reveal 650ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
  }

  .hero > :nth-child(2) {
    animation-delay: 70ms;
  }

  .hero > :nth-child(3) {
    animation-delay: 140ms;
  }

  .hero > :nth-child(4) {
    animation-delay: 210ms;
  }

  .hero > :nth-child(5) {
    animation-delay: 280ms;
  }
}

@keyframes reveal {
  from {
    opacity: 0;
    transform: translateY(0.8rem);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes firework-burst {
  0% {
    opacity: 1;
    transform: translate(0, 0) scale(0.7);
  }

  72% {
    opacity: 1;
  }

  100% {
    opacity: 0;
    transform: translate(var(--particle-x), var(--particle-y)) scale(0.15);
  }
}

@keyframes firework-ring {
  0% {
    opacity: 0.75;
    transform: translate(-50%, -50%) scale(0.35);
  }

  100% {
    opacity: 0;
    transform: translate(-50%, -50%) scale(2.15);
  }
}

@keyframes letter-pop {
  50% {
    color: var(--blue-dark);
    transform: scale(0.82) rotate(5deg);
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .brand-mark.is-celebrating {
    background: var(--yellow);
  }

  .brand-mark.is-celebrating::after,
  .brand-mark.is-celebrating .brand-letter,
  .firework-particle {
    animation: none;
  }
}