:root {
  --paper: #f4f0e7;
  --paper-bright: #fffdf8;
  --ink: #172126;
  --muted: #5e6869;
  --teal: #135a6c;
  --teal-dark: #0b3e4a;
  --aqua: #85cdf2;
  --line: #c9ccc5;
  --amber: #d08d3d;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: "Raleway", sans-serif;
  line-height: 1.6;
  margin: 0;
}

a { color: inherit; }

a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--aqua);
  outline-offset: 4px;
}

.site-header {
  align-items: center;
  background: var(--ink);
  color: white;
  display: flex;
  justify-content: space-between;
  padding: 1rem max(1.5rem, calc((100vw - 1180px) / 2));
}

.studio {
  font-size: 1.05rem;
  font-weight: 800;
  text-decoration: none;
}

.site-header nav {
  display: flex;
  font-size: 0.78rem;
  font-weight: 700;
  gap: 1.5rem;
}

.site-header nav a { text-decoration: none; }
.site-header nav a:hover { color: var(--aqua); }

main { overflow: hidden; }

.hero {
  display: grid;
  gap: 4rem;
  grid-template-columns: minmax(0, 1fr) minmax(32rem, 0.9fr);
  margin: 0 auto;
  max-width: 1180px;
  min-height: 43rem;
  padding: 7rem 1.5rem 5rem;
  place-items: center stretch;
}

.eyebrow {
  color: var(--teal);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.14em;
  margin: 0 0 1rem;
  text-transform: uppercase;
}

h1,
h2 {
  font-family: "Source Serif 4", serif;
  letter-spacing: -0.035em;
  line-height: 1.02;
}

h1 {
  font-size: clamp(3.5rem, 7vw, 6.6rem);
  margin: 0;
  max-width: 10ch;
}

.lede {
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 43rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.button,
.download-button {
  border: 1px solid var(--ink);
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 800;
  padding: 0.8rem 1rem;
  text-decoration: none;
}

.button-primary,
.download-button:not(.is-pending) {
  background: var(--teal);
  border-color: var(--teal);
  color: white;
}

.button-primary:hover,
.download-button:not(.is-pending):hover { background: var(--teal-dark); }

.button-secondary { background: transparent; }
.button-secondary:hover { background: var(--paper-bright); }

.evidence-map {
  align-items: center;
  background-color: #e1e3dc;
  background-image:
    linear-gradient(#1721260e 1px, transparent 1px),
    linear-gradient(90deg, #1721260e 1px, transparent 1px);
  background-size: 22px 22px;
  border: 1px solid var(--ink);
  box-shadow: 16px 16px 0 var(--aqua);
  display: grid;
  gap: 0;
  grid-template-columns: 1fr 2.5rem 1fr 2.5rem 1.1fr;
  min-height: 25rem;
  padding: 2rem;
}

.map-source,
.map-library,
.map-review {
  background: var(--paper-bright);
  border: 1px solid var(--ink);
  min-height: 11rem;
  padding: 1rem;
}

.map-label {
  display: block;
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  margin-bottom: 1rem;
  text-transform: uppercase;
}

.page {
  background: white;
  border: 1px solid #87908d;
  display: block;
  height: 4.6rem;
  margin: 0 auto;
  position: relative;
  width: 3.4rem;
}

.page::after {
  background: repeating-linear-gradient(#89928e 0 1px, transparent 1px 7px);
  content: "";
  inset: 0.75rem 0.55rem;
  position: absolute;
}

.page-two { margin-top: -3.6rem; transform: translateX(0.5rem); }
.page-three { margin-top: -3.6rem; transform: translateX(1rem); }

.map-route { border-top: 1px solid var(--ink); position: relative; }
.map-route::after {
  border-right: 1px solid var(--ink);
  border-top: 1px solid var(--ink);
  content: "";
  height: 0.45rem;
  position: absolute;
  right: 0;
  top: -0.28rem;
  transform: rotate(45deg);
  width: 0.45rem;
}

.map-library {
  background: var(--teal-dark);
  color: white;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}

.map-library > span:not(.map-label) {
  border: 1px solid #ffffff40;
  font-size: 0.68rem;
  padding: 0.35rem;
}

.map-review strong {
  color: var(--teal);
  display: block;
  font-size: 0.55rem;
  margin-top: 1rem;
}

.review-row {
  background: var(--amber);
  display: block;
  height: 0.55rem;
  margin: 0.65rem 0;
  width: 90%;
}

.review-row-short { background: var(--aqua); width: 60%; }

.principles {
  background: var(--ink);
  color: white;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin: 0 auto;
  max-width: 100%;
  padding: 0 max(1.5rem, calc((100vw - 1180px) / 2));
}

.principles article {
  border-left: 1px solid #ffffff25;
  padding: 3rem 2rem;
}

.principles article:last-child { border-right: 1px solid #ffffff25; }
.principles article > span { color: var(--aqua); font-size: 0.7rem; }
.principles h2 { font-family: "Raleway", sans-serif; font-size: 1.15rem; letter-spacing: 0; }
.principles p { color: #c5cecf; font-size: 0.82rem; }

.capabilities {
  margin: 0 auto;
  max-width: 1180px;
  padding: 7rem 1.5rem;
}

.section-heading { max-width: 48rem; }
.section-heading h2,
.downloads h2,
.open-source h2 { font-size: clamp(2.6rem, 5vw, 4.5rem); margin: 0; }

.capability-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-top: 4rem;
}

.capability-grid article {
  border-top: 1px solid var(--line);
  padding: 2rem 3rem 2rem 0;
}

.capability-grid article:nth-child(odd) { border-right: 1px solid var(--line); }
.capability-grid article:nth-child(even) { padding-left: 3rem; }
.capability-grid h3 { font-size: 1rem; margin: 0 0 0.7rem; }
.capability-grid p { color: var(--muted); font-size: 0.88rem; margin: 0; }

.downloads {
  background: var(--paper-bright);
  border-block: 1px solid var(--line);
  display: grid;
  gap: 5rem;
  grid-template-columns: minmax(0, 0.8fr) minmax(34rem, 1.2fr);
  padding: 6rem max(1.5rem, calc((100vw - 1180px) / 2));
}

.download-copy > p:not(.eyebrow) { color: var(--muted); }
.requirements { font-size: 0.8rem; }
.release-links { display: flex; flex-wrap: wrap; font-size: 0.75rem; font-weight: 700; gap: 1rem; }
.release-links a { color: var(--teal); }

.download-options { display: grid; gap: 1rem; grid-template-columns: repeat(2, 1fr); }
.download-options article { background: var(--paper); border: 1px solid var(--ink); padding: 2rem; }
.download-options h3 { font-size: 1.5rem; margin: 1.8rem 0 0.4rem; }
.download-options p { color: var(--muted); font-size: 0.78rem; min-height: 3.8rem; }
.platform-mark { border: 1px solid var(--line); font-size: 0.65rem; font-weight: 800; padding: 0.35rem 0.5rem; }
.download-button { width: 100%; }
.download-button.is-pending { color: var(--muted); cursor: not-allowed; }

.open-source {
  margin: 0 auto;
  max-width: 1180px;
  padding: 7rem 1.5rem;
}

.open-source h2 { max-width: 17ch; }
.open-source > p:not(.eyebrow) { color: var(--muted); max-width: 49rem; }
.text-link { color: var(--teal); font-weight: 800; }

footer {
  align-items: center;
  background: var(--teal-dark);
  color: white;
  display: flex;
  font-size: 0.75rem;
  justify-content: space-between;
  padding: 2rem max(1.5rem, calc((100vw - 1180px) / 2));
}

footer a { font-weight: 800; }

@media (max-width: 940px) {
  .hero,
  .downloads { grid-template-columns: 1fr; }
  .hero { padding-top: 5rem; }
  .evidence-map { min-height: 22rem; }
  .downloads { gap: 3rem; }
}

@media (max-width: 680px) {
  .site-header nav a:not(:last-child) { display: none; }
  .hero { gap: 3rem; min-height: 0; padding-block: 4rem; }
  h1 { font-size: clamp(3rem, 16vw, 4.5rem); }
  .evidence-map { grid-template-columns: 1fr; gap: 1rem; padding: 1.2rem; }
  .map-route { border-left: 1px solid var(--ink); border-top: 0; height: 1.5rem; justify-self: center; }
  .map-route::after { bottom: 0; right: -0.28rem; top: auto; transform: rotate(135deg); }
  .map-source,
  .map-library,
  .map-review { min-height: 9rem; width: 100%; }
  .principles,
  .capability-grid,
  .download-options { grid-template-columns: 1fr; }
  .principles { padding-inline: 1.5rem; }
  .principles article,
  .principles article:last-child { border-inline: 1px solid #ffffff25; }
  .capability-grid article,
  .capability-grid article:nth-child(even) { border-right: 0; padding-inline: 0; }
  .downloads { min-width: 0; }
  footer { align-items: flex-start; flex-direction: column; gap: 0.6rem; }
}