:root {
  color-scheme: light;
  --ink: #102432;
  --muted: #506574;
  --paper: #f4f8f7;
  --surface: #ffffff;
  --teal: #087f72;
  --teal-dark: #075e56;
  --teal-soft: #dff5f1;
  --blue: #4158d0;
  --amber: #946200;
  --line: #cbd8db;
  --line-strong: #9db3b8;
  --code: #0d2029;
  --shadow: 0 24px 70px rgb(16 36 50 / 10%);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  margin: 0;
  background:
    linear-gradient(rgb(8 127 114 / 4%) 1px, transparent 1px),
    linear-gradient(90deg, rgb(8 127 114 / 4%) 1px, transparent 1px),
    var(--paper);
  background-size: 40px 40px;
  color: var(--ink);
  font: 400 1rem/1.7 system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--teal-dark);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.22em;
}

a:hover {
  text-decoration-thickness: 2px;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 4px;
  border-radius: 0.25rem;
}

img {
  max-width: 100%;
}

.skip-link {
  position: fixed;
  z-index: 100;
  top: 0.75rem;
  left: 0.75rem;
  translate: 0 -200%;
  padding: 0.65rem 1rem;
  border: 2px solid var(--teal);
  border-radius: 0.5rem;
  background: var(--surface);
  font-weight: 700;
}

.skip-link:focus {
  translate: 0;
}

.site-header,
main,
footer {
  width: min(1180px, calc(100% - 3rem));
  margin-inline: auto;
}

.site-header {
  display: flex;
  position: relative;
  z-index: 5;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-block: 1.1rem;
  border-bottom: 1px solid var(--line);
}

.brand {
  display: inline-flex;
  min-width: max-content;
  align-items: center;
  gap: 0.7rem;
  color: var(--ink);
  text-decoration: none;
}

.brand img {
  display: block;
}

.brand span,
.footer-brand span {
  display: flex;
  flex-direction: column;
  line-height: 1.05;
}

.brand strong {
  font-size: 1.05rem;
  letter-spacing: 0.08em;
}

.brand small {
  color: var(--muted);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.site-header nav,
footer nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.2rem 1rem;
}

.site-header nav a,
footer nav a {
  min-height: 44px;
  padding-block: 0.55rem;
  color: var(--ink);
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
}

.site-header nav a:hover,
footer nav a:hover {
  color: var(--teal);
  text-decoration: underline;
}

.site-header .nav-github {
  padding-inline: 0.9rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: var(--surface);
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(360px, 0.95fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 5rem);
  min-height: 680px;
  padding-block: 5.5rem;
}

.eyebrow {
  margin: 0 0 0.9rem;
  color: var(--teal-dark);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(2.8rem, 6.6vw, 5.6rem);
  font-weight: 760;
  letter-spacing: -0.055em;
  line-height: 0.98;
}

h1 span {
  color: var(--teal);
}

html[lang="en"] h1 {
  font-size: clamp(2.8rem, 5.5vw, 4.7rem);
}

html[lang="en"] .site-header nav {
  column-gap: 0.7rem;
}

.lead {
  max-width: 42rem;
  margin: 1.8rem 0 0;
  color: var(--muted);
  font-size: clamp(1.05rem, 1.8vw, 1.22rem);
  line-height: 1.75;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2rem;
}

.button {
  display: inline-flex;
  min-height: 48px;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.15rem;
  border: 1px solid var(--teal);
  border-radius: 0.55rem;
  font-weight: 750;
  text-decoration: none;
}

.button.primary {
  background: var(--teal);
  color: white;
}

.button.primary:hover {
  background: var(--teal-dark);
}

.button.secondary {
  background: var(--surface);
}

.facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin: 2.8rem 0 0;
  padding: 1.15rem 0 0;
  border-top: 1px solid var(--line);
  list-style: none;
}

.facts li {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-right: 1rem;
}

.facts strong {
  font-size: 0.9rem;
}

.facts span {
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.45;
}

.ledger {
  position: relative;
  border: 1px solid var(--line-strong);
  border-radius: 1rem;
  background: rgb(255 255 255 / 90%);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.ledger::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgb(8 127 114 / 8%), transparent 45%);
  pointer-events: none;
}

.ledger-head {
  display: flex;
  position: relative;
  align-items: center;
  gap: 0.65rem;
  min-height: 52px;
  padding: 0.8rem 1.1rem;
  border-bottom: 1px solid var(--line);
  background: rgb(244 248 247 / 88%);
  font: 0.78rem/1.4 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--teal);
  box-shadow: 0 0 0 4px var(--teal-soft);
}

.ledger-tag {
  margin-left: auto;
  padding: 0.15rem 0.5rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.75rem;
}

.ledger-list {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.ledger-list li {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr) auto;
  align-items: center;
  gap: 0.9rem;
  min-height: 92px;
  padding: 1rem 1.1rem;
  border-bottom: 1px solid var(--line);
}

.ledger-no {
  color: var(--teal);
  font: 700 0.78rem/1 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.ledger-list div {
  display: flex;
  flex-direction: column;
}

.ledger-list strong {
  font-size: 0.95rem;
}

.ledger-list small {
  margin-top: 0.15rem;
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.5;
}

.state,
.cap-state {
  padding: 0.2rem 0.5rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 750;
  white-space: nowrap;
}

.state.ready,
.cap-state.ready {
  background: var(--teal-soft);
  color: var(--teal-dark);
}

.state.gated,
.cap-state.progress {
  background: #fff1cc;
  color: #744d00;
}

.ledger-foot {
  position: relative;
  margin: 0;
  padding: 0.8rem 1.1rem;
  color: var(--muted);
  font-size: 0.75rem;
}

.statement {
  display: grid;
  grid-template-columns: 1fr 1fr;
  margin-block: 0 7rem;
  border-block: 1px solid var(--line-strong);
}

.statement p {
  margin: 0;
  padding: 1.8rem 2rem;
  font-size: clamp(1.08rem, 2vw, 1.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.statement p + p {
  border-left: 1px solid var(--line-strong);
  color: var(--teal-dark);
}

.section {
  padding-block: 6rem;
}

.section-heading {
  max-width: 760px;
}

.section-heading h2,
.docs-band h2 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  letter-spacing: -0.045em;
  line-height: 1.12;
}

.section-heading > p:last-child {
  margin: 1.2rem 0 0;
  color: var(--muted);
  font-size: 1.06rem;
}

.architecture {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr) auto) minmax(0, 1fr);
  align-items: stretch;
  gap: 0.75rem;
  margin-top: 3rem;
}

.arch-card {
  min-height: 220px;
  padding: 1.4rem;
  border: 1px solid var(--line);
  border-radius: 0.85rem;
  background: var(--surface);
}

.arch-card.agent {
  border-color: var(--teal);
  box-shadow: inset 0 4px 0 var(--teal);
}

.arch-card.skill {
  box-shadow: inset 0 4px 0 var(--blue);
}

.arch-card.proof {
  box-shadow: inset 0 4px 0 #d09b25;
}

.arch-index {
  color: var(--muted);
  font-size: 0.75rem;
  font-weight: 750;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.arch-card h3 {
  margin: 1.6rem 0 0.6rem;
  font-size: 1.06rem;
  line-height: 1.35;
}

.arch-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.connector {
  align-self: center;
  color: var(--line-strong);
  font-size: 1.6rem;
}

.section-link {
  margin: 1.7rem 0 0;
  font-weight: 700;
}

.section-tint {
  position: relative;
}

.section-tint::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: 1.5rem -4vw;
  border: 1px solid var(--line);
  border-radius: 1.4rem;
  background: rgb(255 255 255 / 66%);
}

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

.capability {
  display: flex;
  min-height: 250px;
  flex-direction: column;
  align-items: flex-start;
  padding: 1.5rem;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  background: var(--surface);
}

.capability.pending {
  border-style: dashed;
}

.capability h3 {
  margin: 1.4rem 0 0.55rem;
  font-size: 1.12rem;
}

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

.capability > code {
  margin-top: auto;
  padding-top: 1.5rem;
  color: var(--teal-dark);
  font-size: 0.82rem;
  font-weight: 700;
}

.start-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr);
  align-items: start;
  gap: 2.5rem;
  margin-top: 3rem;
}

.terminal {
  overflow: hidden;
  border: 1px solid #24414c;
  border-radius: 0.9rem;
  background: var(--code);
  box-shadow: var(--shadow);
  color: #e8f5f3;
}

.terminal-bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 48px;
  padding-inline: 1rem;
  border-bottom: 1px solid #294650;
  background: #112a35;
}

.terminal-bar span {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #e57c73;
}

.terminal-bar span:nth-child(2) {
  background: #d7b45e;
}

.terminal-bar span:nth-child(3) {
  background: #64bd8b;
}

.terminal-bar b {
  margin-left: auto;
  color: #9fb4bb;
  font: 500 0.75rem/1 ui-monospace, SFMono-Regular, Consolas, monospace;
}

pre {
  margin: 0;
  padding: 1.4rem;
  overflow-x: auto;
  font: 0.84rem/1.75 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.comment {
  color: #83b8b0;
}

.start-notes {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.start-notes article {
  display: grid;
  grid-template-columns: 2.4rem minmax(0, 1fr);
  gap: 0.9rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--line);
}

.start-notes article > span {
  color: var(--teal);
  font: 700 0.8rem/1.8 ui-monospace, SFMono-Regular, Consolas, monospace;
}

.start-notes h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.start-notes p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.text-link {
  min-height: 44px;
  padding-block: 0.5rem;
  font-weight: 750;
}

.boundary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 3rem;
}

.boundary-grid article {
  padding: 1.5rem;
  border-left: 3px solid var(--teal);
  background: rgb(255 255 255 / 74%);
}

.boundary-grid strong {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 1rem;
}

.boundary-grid p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
}

.docs-band {
  display: grid;
  grid-template-columns: minmax(0, 0.78fr) minmax(0, 1.22fr);
  gap: 4rem;
  margin-block: 3rem 7rem;
  padding: clamp(2rem, 5vw, 4rem);
  border-radius: 1.2rem;
  background: var(--ink);
  color: white;
}

.docs-band .eyebrow {
  color: #7be0d1;
}

.docs-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: rgb(255 255 255 / 18%);
}

.docs-links a {
  display: flex;
  min-height: 130px;
  flex-direction: column;
  justify-content: center;
  padding: 1.2rem;
  background: var(--ink);
  color: white;
  text-decoration: none;
}

.docs-links a:hover {
  background: #173646;
}

.docs-links span {
  margin-top: 0.35rem;
  color: #b8c8ce;
  font-size: 0.82rem;
}

footer {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding-block: 2rem;
  border-top: 1px solid var(--line-strong);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

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

footer > p {
  margin: 0 auto;
}

@media (max-width: 980px) {
  .site-header {
    align-items: flex-start;
  }

  .site-header nav {
    justify-content: flex-end;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: 0;
    padding-block: 4rem;
  }

  .ledger {
    max-width: 680px;
  }

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

  .connector {
    display: none;
  }

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

  .start-grid,
  .docs-band {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 680px) {
  .site-header,
  main,
  footer {
    width: min(100% - 2rem, 1180px);
  }

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

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

  .site-header nav a {
    font-size: 0.82rem;
  }

  h1 {
    font-size: clamp(2.6rem, 13vw, 4.2rem);
  }

  .facts,
  .statement,
  .architecture,
  .capability-grid,
  .boundary-grid,
  .docs-links {
    grid-template-columns: 1fr;
  }

  .facts {
    gap: 1rem;
  }

  .statement p + p {
    border-top: 1px solid var(--line-strong);
    border-left: 0;
  }

  .ledger-list li {
    grid-template-columns: 2rem minmax(0, 1fr);
  }

  .ledger-list .state {
    grid-column: 2;
    justify-self: start;
  }

  .arch-card,
  .capability {
    min-height: auto;
  }

  .section {
    padding-block: 4rem;
  }

  .docs-band {
    margin-bottom: 4rem;
  }

  footer {
    flex-direction: column;
    align-items: flex-start;
  }

  footer > p {
    margin: 0;
  }
}

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

@media (prefers-contrast: more) {
  :root {
    --line: #6f858b;
    --line-strong: #425c63;
  }

  .section-tint::before,
  .boundary-grid article {
    background: var(--surface);
  }
}