:root {
  color-scheme: light;
  --ink: #17233d;
  --paper: #f5f7fb;
  --surface: #ffffff;
  --cobalt: #2d5bce;
  --mint: #1f8a70;
  --coral: #d9574e;
  --graphite: #526078;
  --line: #ccd5e6;
}

* {
  box-sizing: border-box;
}

html {
  min-width: 320px;
  background: var(--paper);
}

body {
  min-height: 100vh;
  margin: 0;
  color: var(--ink);
  background:
    linear-gradient(rgba(45, 91, 206, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(45, 91, 206, 0.045) 1px, transparent 1px),
    var(--paper);
  background-size: 48px 48px;
  font-family: "Inter", "Segoe UI", Arial, sans-serif;
}

a {
  color: inherit;
}

.skip-link {
  position: fixed;
  z-index: 10;
  top: 0.75rem;
  left: 0.75rem;
  padding: 0.65rem 0.8rem;
  color: #ffffff;
  background: var(--ink);
  transform: translateY(-180%);
}

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

.site-header {
  display: flex;
  width: min(100% - 3rem, 1160px);
  align-items: center;
  justify-content: space-between;
  margin: 0 auto;
  padding: 1.5rem 0;
  border-bottom: 1px solid var(--line);
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-size: 1.05rem;
  font-weight: 750;
  letter-spacing: -0.025em;
  text-decoration: none;
}

.wordmark__mark {
  width: 2rem;
  height: 2rem;
  overflow: visible;
}

.wordmark__mark path {
  fill: none;
  stroke: var(--cobalt);
  stroke-linecap: square;
  stroke-width: 2;
}

.wordmark__mark circle {
  fill: var(--surface);
  stroke: var(--cobalt);
  stroke-width: 2;
}

.site-nav {
  display: inline-flex;
  gap: 1.4rem;
}

.site-nav a {
  color: var(--graphite);
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
}

.site-nav a:hover {
  color: var(--ink);
}

.landing {
  display: grid;
  width: min(100% - 3rem, 1160px);
  align-items: center;
  margin: 0 auto;
  padding: clamp(4rem, 10vh, 7rem) 0 clamp(3rem, 7vh, 5rem);
  grid-template-columns: minmax(160px, 0.7fr) minmax(0, 1.5fr);
  gap: clamp(2.5rem, 8vw, 7rem);
}

.landing__content {
  max-width: 720px;
}

.eyebrow {
  margin: 0 0 1rem;
  color: var(--mint);
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

h1 {
  max-width: 700px;
  margin: 0;
  font-family: "Inter", "Segoe UI", Arial, sans-serif;
  font-size: clamp(3.5rem, 8vw, 7.8rem);
  font-weight: 620;
  letter-spacing: -0.055em;
  line-height: 0.92;
}

.lede {
  max-width: 570px;
  margin: 2rem 0 2.25rem;
  color: var(--graphite);
  font-size: clamp(1rem, 1.7vw, 1.22rem);
  line-height: 1.65;
}

.docs-link {
  display: inline-flex;
  min-height: 3rem;
  align-items: center;
  gap: 1.4rem;
  padding: 0.75rem 1rem;
  border: 1px solid var(--ink);
  color: #ffffff;
  background: var(--ink);
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  transition: color 150ms ease, background 150ms ease, gap 150ms ease;
}

.docs-link:hover {
  gap: 1.8rem;
  color: var(--ink);
  background: transparent;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.docs-link--ghost {
  color: var(--ink);
  background: transparent;
}

.docs-link--ghost:hover {
  color: #ffffff;
  background: var(--ink);
}

.docs-link:focus-visible,
.wordmark:focus-visible {
  outline: 3px solid rgba(45, 91, 206, 0.45);
  outline-offset: 4px;
}

.taxonomy-path {
  position: relative;
  width: min(100%, 300px);
  aspect-ratio: 1;
}

.taxonomy-path::before,
.taxonomy-path::after,
.taxonomy-path__line {
  position: absolute;
  height: 2px;
  background: var(--cobalt);
  content: "";
  transform-origin: left center;
}

.taxonomy-path__line {
  top: 50%;
  left: 0;
  width: 48%;
}

.taxonomy-path::before {
  top: 50%;
  left: 48%;
  width: 46%;
  transform: rotate(-34deg);
}

.taxonomy-path::after {
  top: 50%;
  left: 48%;
  width: 46%;
  transform: rotate(34deg);
}

.taxonomy-path__node {
  position: absolute;
  z-index: 1;
  width: 1.1rem;
  height: 1.1rem;
  border: 3px solid var(--cobalt);
  border-radius: 50%;
  background: var(--paper);
  transform: translate(-50%, -50%);
}

.taxonomy-path__node--origin {
  top: 50%;
  left: 0;
  width: 1.35rem;
  height: 1.35rem;
  border-color: var(--mint);
}

.taxonomy-path__node--upper {
  top: 24%;
  left: 87%;
}

.taxonomy-path__node--lower {
  top: 76%;
  left: 87%;
  border-color: var(--coral);
}

.runtime-sequence {
  display: grid;
  width: min(100% - 3rem, 1160px);
  margin: 0 auto 1rem;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--line);
}

.runtime-sequence span {
  padding-top: 0.85rem;
  color: var(--ink);
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.runtime-sequence b {
  margin-right: 0.55rem;
  color: var(--cobalt);
  font-weight: 700;
}

.runtime-sequence span + span {
  padding-left: 1rem;
  border-left: 1px solid var(--line);
}

@media (max-width: 760px) {
  .site-header,
  .landing {
    width: min(100% - 2rem, 1160px);
  }

  .site-nav {
    gap: 1rem;
  }

  .landing {
    min-height: calc(100vh - 82px);
    align-content: start;
    padding-top: 3.5rem;
    grid-template-columns: 1fr;
    gap: 2.75rem;
  }

  .taxonomy-path {
    width: 150px;
  }

  h1 {
    font-size: clamp(3.4rem, 18vw, 5.2rem);
  }

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

  .runtime-sequence span {
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--line);
  }
}

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

/* ── landing sections ── */

.section {
  width: min(100% - 3rem, 1160px);
  margin: 0 auto;
  padding: 3.25rem 0 1rem;
}

.paper-grid {
  display: grid;
  gap: 1.25rem;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  margin-top: 1.5rem;
}

.paper {
  padding: 1.6rem 1.75rem;
  border: 1px solid var(--line);
  border-top: 3px solid var(--cobalt);
  background: var(--surface);
}

.paper__badge {
  margin: 0 0 0.9rem;
  color: var(--cobalt);
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.paper--gold,
.paper:has(.paper__badge--gold) {
  border-top-color: var(--coral);
}

.paper__badge--gold {
  color: var(--coral);
}

.paper__title {
  margin: 0 0 0.8rem;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.3;
}

.paper__authors {
  margin: 0 0 1.1rem;
  color: var(--graphite);
  font-size: 0.88rem;
  line-height: 1.6;
}

.paper__links {
  display: flex;
  gap: 1.4rem;
  margin: 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.paper__links a {
  color: var(--cobalt);
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
}

.paper__links a:hover {
  text-decoration: underline;
}

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

.post-row {
  display: flex;
  gap: 1.75rem;
  align-items: baseline;
  padding: 0.95rem 0.25rem;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
}

.post-row__date {
  flex: none;
  width: 4.6rem;
  color: var(--graphite);
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.post-row__title {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.008em;
}

.post-row:hover .post-row__title {
  color: var(--cobalt);
}

.section__more {
  margin: 1.4rem 0 0;
}

.section__more a {
  color: var(--cobalt);
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-decoration: none;
  text-transform: uppercase;
}

.site-footer {
  width: min(100% - 3rem, 1160px);
  margin: 3rem auto 0;
  padding: 1.5rem 0 2.25rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  align-items: center;
  justify-content: space-between;
}

.site-footer p {
  margin: 0;
  color: var(--graphite);
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.site-footer nav {
  display: inline-flex;
  gap: 1.4rem;
}

.site-footer a {
  color: var(--graphite);
  font-family: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;
  font-size: 0.68rem;
  letter-spacing: 0.07em;
  text-decoration: none;
  text-transform: uppercase;
}

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

h1 strong,
.wordmark strong {
  font-weight: 860;
}

.landing__logo {
  width: clamp(150px, 24vw, 300px);
  max-width: 100%;
  height: auto;
  justify-self: center;
}

@media (max-width: 760px) {
  .landing__logo {
    width: 150px;
    justify-self: start;
  }
}