:root {
  color-scheme: light dark;
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", system-ui, sans-serif;
  background: #f5f6fa;
  color: #141722;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  background: #f5f6fa;
}

main {
  width: min(760px, calc(100% - 32px));
  margin: 0 auto;
  padding: 64px 0 80px;
}

h1 {
  margin: 0 0 10px;
  font-size: clamp(2.35rem, 7vw, 4.3rem);
  letter-spacing: -0.045em;
  line-height: 0.98;
}

.lede {
  max-width: 640px;
  margin: 0 0 32px;
  color: #606677;
  font-size: 1.13rem;
  line-height: 1.55;
}

article {
  padding: clamp(24px, 5vw, 48px);
  border: 1px solid rgba(70, 76, 95, 0.12);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.84);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.08);
  backdrop-filter: blur(24px);
}

h2 {
  margin: 32px 0 8px;
  font-size: 1.22rem;
  letter-spacing: -0.015em;
}

h2:first-child { margin-top: 0; }

p, li {
  color: #4f5668;
  line-height: 1.65;
}

ul { padding-left: 1.25rem; }

a {
  color: #2458d5;
  font-weight: 650;
  text-underline-offset: 0.16em;
}

.updated {
  margin-top: 32px;
  color: #777e8e;
  font-size: 0.9rem;
}

nav {
  display: flex;
  gap: 18px;
  margin-top: 28px;
}

@media (prefers-color-scheme: dark) {
  :root { background: #0d1018; color: #f5f7ff; }
  body { background: #0d1018; }
  article {
    border-color: rgba(255, 255, 255, 0.09);
    background: rgba(25, 29, 40, 0.86);
    box-shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
  }
  .lede, p, li { color: #b4bac9; }
  .updated { color: #9299aa; }
  a { color: #79a4ff; }
}