:root {
  color-scheme: light;
  --background: #f6f7f4;
  --foreground: #18212f;
  --muted: #6b7280;
  --panel: #ffffff;
  --line: #d9ded8;
  --accent: #245c73;
  --accent-strong: #173b4a;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  background: var(--background);
  color: var(--foreground);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: inherit;
}

.shell {
  min-height: 100vh;
  padding: 40px;
}

.hero {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(360px, 1.1fr);
  gap: 32px;
  max-width: 1180px;
  margin: 0 auto;
  align-items: center;
}

.hero-copy {
  display: grid;
  gap: 18px;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
}

h1 {
  max-width: 680px;
  font-size: 48px;
  line-height: 1.02;
  letter-spacing: 0;
}

.hero-copy p:not(.eyebrow),
.band p,
.grid p {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.hero-copy p:not(.eyebrow) {
  max-width: 650px;
  font-size: 18px;
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.actions a {
  border: 1px solid rgb(36 92 115 / 24%);
  border-radius: 6px;
  color: #ffffff;
  background: var(--accent);
  font-weight: 800;
  padding: 11px 14px;
  text-decoration: none;
}

.signal-map {
  display: grid;
  gap: 18px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgb(36 92 115 / 8%), transparent 45%),
    var(--panel);
  box-shadow: 0 18px 48px rgb(24 33 47 / 8%);
}

.signal-map pre {
  overflow: auto;
  margin: 0;
  color: var(--accent-strong);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 15px;
  line-height: 1.2;
}

.signal-flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.signal-flow span {
  display: grid;
  min-height: 48px;
  place-items: center;
  border: 1px solid rgb(36 92 115 / 18%);
  border-radius: 6px;
  color: var(--accent-strong);
  background: #ffffff;
  font-size: 13px;
  font-weight: 800;
  text-align: center;
}

.band,
.grid {
  max-width: 1180px;
  margin: 28px auto 0;
}

.band {
  display: grid;
  grid-template-columns: minmax(260px, 0.8fr) minmax(320px, 1.2fr);
  gap: 28px;
  align-items: start;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.band h2,
.grid h2 {
  color: var(--foreground);
  font-size: 26px;
  line-height: 1.15;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.grid article {
  display: grid;
  gap: 12px;
  align-content: start;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.grid ul {
  margin: 0;
  padding-left: 18px;
  color: var(--foreground);
}

.grid li + li {
  margin-top: 6px;
}

@media (max-width: 820px) {
  .shell {
    padding: 24px;
  }

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

  h1 {
    font-size: 38px;
  }

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