:root {
  --os-bg: #f7f4ec;
  --os-ink: #202528;
  --os-muted: #677177;
  --os-panel: #fffdf7;
  --os-line: #d8d0c0;
  --os-green: #52715a;
  --os-blue: #355f7c;
  --os-rust: #985c35;
  --os-gold: #a98635;
  --os-charcoal: #172026;
  --os-shadow: 0 18px 42px rgba(32, 37, 40, 0.12);
}

* {
  box-sizing: border-box;
}

body.open-source-page {
  margin: 0;
  background: var(--os-bg);
  color: var(--os-ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

.opensource-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: center;
  gap: 0.35rem;
  padding: 0.6rem;
  border-bottom: 1px solid var(--os-line);
  background: rgba(247, 244, 236, 0.9);
  backdrop-filter: blur(14px);
}

.opensource-nav a,
.action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.62rem 0.9rem;
  border: 1px solid var(--os-line);
  border-radius: 8px;
  color: var(--os-ink);
  text-decoration: none;
  font-weight: 850;
}

.opensource-nav a:hover,
.action:hover,
.resource-card:hover,
.tool-card:hover,
.ecology-card:hover {
  border-color: var(--os-rust);
}

.open-hero,
main,
.opensource-footer {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.open-hero {
  min-height: calc(100vh - 56px);
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(360px, 1.05fr);
  gap: clamp(1.25rem, 4vw, 4rem);
  align-items: center;
  padding: clamp(2rem, 6vw, 5rem) 0;
}

.hero-copy {
  max-width: 660px;
}

.eyebrow {
  margin: 0 0 0.7rem;
  color: var(--os-rust);
  font-size: 0.76rem;
  font-weight: 950;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

h1 {
  margin: 0;
  max-width: 12ch;
  font-size: clamp(3rem, 8.5vw, 6.6rem);
  line-height: 0.94;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: clamp(2rem, 4.5vw, 4rem);
  line-height: 1;
  letter-spacing: 0;
}

h3 {
  margin: 0 0 0.45rem;
  font-size: 1.15rem;
  line-height: 1.18;
}

.hero-copy p,
.section-intro p,
.guide-card p,
.resource-card span,
.ecology-card span,
.gap-list span,
.practice-list span {
  color: var(--os-muted);
}

.hero-copy p {
  max-width: 58ch;
  margin: 1.25rem 0 0;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.action {
  background: var(--os-panel);
  box-shadow: 0 10px 24px rgba(32, 37, 40, 0.08);
}

.action.primary {
  background: var(--os-charcoal);
  color: #fffaf0;
  border-color: var(--os-charcoal);
}

.system-board {
  min-height: 600px;
  position: relative;
  border: 1px solid var(--os-line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(82, 113, 90, 0.16), transparent 36%),
    linear-gradient(315deg, rgba(53, 95, 124, 0.13), transparent 38%),
    #ebe5d8;
  box-shadow: var(--os-shadow);
  overflow: hidden;
}

.system-board::before,
.system-board::after {
  content: "";
  position: absolute;
  inset: 12%;
  border: 1px solid rgba(32, 37, 40, 0.15);
  border-radius: 50%;
}

.system-board::after {
  inset: 26%;
}

.center-node,
.node {
  position: absolute;
  display: grid;
  place-items: center;
  min-width: 112px;
  min-height: 58px;
  padding: 0.7rem;
  border: 1px solid rgba(32, 37, 40, 0.14);
  border-radius: 8px;
  background: rgba(255, 253, 247, 0.88);
  color: var(--os-charcoal);
  font-weight: 950;
  box-shadow: 0 12px 28px rgba(32, 37, 40, 0.11);
  text-align: center;
}

.center-node {
  left: 50%;
  top: 50%;
  min-width: 150px;
  min-height: 86px;
  background: var(--os-charcoal);
  color: #fffaf0;
  transform: translate(-50%, -50%);
}

.node-os {
  left: 12%;
  top: 15%;
}

.node-browser {
  right: 11%;
  top: 19%;
}

.node-art {
  left: 10%;
  bottom: 22%;
}

.node-hardware {
  right: 10%;
  bottom: 23%;
}

.node-ecology {
  left: 39%;
  bottom: 8%;
}

.node-cad {
  left: 43%;
  top: 7%;
}

main {
  display: grid;
  gap: clamp(2.2rem, 5vw, 4rem);
  padding-bottom: 4rem;
}

.principles,
.stack-section,
.gap-panel,
.ecology-section,
.practice-section {
  display: grid;
  gap: 1.25rem;
}

.section-intro {
  max-width: 820px;
}

.section-intro p {
  max-width: 70ch;
}

.cards,
.resource-grid,
.ecology-grid {
  display: grid;
  gap: 0.85rem;
}

.three-up,
.tool-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.resource-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

.guide-card,
.resource-card,
.gap-panel,
.gap-list article,
.ecology-card,
.practice-list li {
  border: 1px solid var(--os-line);
  border-radius: 8px;
  background: var(--os-panel);
  box-shadow: 0 10px 28px rgba(32, 37, 40, 0.07);
}

.guide-card,
.resource-card,
.ecology-card {
  display: grid;
  align-content: start;
  min-height: 178px;
  padding: 1rem;
  color: var(--os-ink);
  text-decoration: none;
}

.kicker {
  display: inline-flex;
  width: fit-content;
  margin-bottom: 1.15rem;
  color: var(--os-rust);
  font-size: 0.75rem;
  font-weight: 950;
  text-transform: uppercase;
}

.resource-card strong,
.ecology-card strong {
  margin-bottom: 0.45rem;
  color: var(--os-blue);
  font-size: 1.05rem;
}

.gap-panel {
  grid-template-columns: minmax(0, 0.78fr) minmax(330px, 1.22fr);
  align-items: start;
  padding: clamp(1rem, 3vw, 2rem);
}

.gap-list {
  display: grid;
  gap: 0.65rem;
}

.gap-list article {
  display: grid;
  grid-template-columns: minmax(86px, 0.25fr) 1fr;
  gap: 0.75rem;
  padding: 0.85rem;
}

.gap-list strong {
  color: var(--os-green);
}

.ecology-section {
  padding: clamp(1rem, 3vw, 2rem);
  border: 1px solid var(--os-line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(82, 113, 90, 0.12), transparent 42%),
    var(--os-panel);
}

.practice-list {
  display: grid;
  gap: 0.75rem;
  padding: 0;
  margin: 0;
  list-style: none;
}

.practice-list li {
  display: grid;
  grid-template-columns: minmax(180px, 0.35fr) 1fr;
  gap: 0.75rem;
  padding: 1rem;
}

.practice-list strong {
  color: var(--os-rust);
}

.opensource-footer {
  padding: 1.25rem 0 2rem;
  border-top: 1px solid var(--os-line);
  color: var(--os-muted);
}

@media (max-width: 960px) {
  .opensource-nav {
    overflow-x: auto;
    justify-content: flex-start;
  }

  .open-hero,
  .gap-panel {
    grid-template-columns: 1fr;
  }

  .open-hero {
    min-height: auto;
    padding-top: 2rem;
  }

  .system-board {
    min-height: 500px;
  }

  .three-up,
  .tool-grid,
  .resource-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .open-hero,
  main,
  .opensource-footer {
    width: min(100% - 1rem, 1180px);
  }

  h1 {
    max-width: 11ch;
  }

  .system-board {
    min-height: 470px;
  }

  .center-node,
  .node {
    min-width: 92px;
    min-height: 50px;
    font-size: 0.82rem;
  }

  .three-up,
  .tool-grid,
  .resource-grid,
  .ecology-grid {
    grid-template-columns: 1fr;
  }

  .gap-list article,
  .practice-list li {
    grid-template-columns: 1fr;
  }

  .hero-actions {
    display: grid;
  }
}