:root {
  color-scheme: light;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: #f6f7f9;
  color: #15171a;
}

body {
  margin: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

.app-shell {
  display: grid;
  grid-template-columns: 220px minmax(0, 1fr);
  min-height: 100vh;
}

.rail {
  background: #111827;
  color: #f8fafc;
  display: flex;
  flex-direction: column;
  gap: 24px;
  padding: 24px;
}

.rail nav {
  display: grid;
  gap: 12px;
}

.surface {
  align-content: center;
  padding: 48px;
}

.eyebrow {
  color: #2563eb;
  font-weight: 700;
  text-transform: uppercase;
}

h1 {
  font-size: 48px;
  margin: 0 0 16px;
}

@media (max-width: 720px) {
  .app-shell {
    grid-template-columns: 1fr;
  }

  .rail {
    min-height: auto;
  }

  .surface {
    padding: 28px;
  }
}