:root {
  color-scheme: dark;
  color: #e2e8f0;
  background: #0f172a;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
* { box-sizing: border-box; }
body { margin: 0; background: radial-gradient(ellipse at top right, #12303966, transparent 45%); }
a { color: #38bdf8; text-decoration-thickness: 1px; text-underline-offset: 5px; }
a:hover { color: #2dd4bf; }
a:focus-visible { outline: 2px solid #2dd4bf; outline-offset: 5px; border-radius: 2px; }
::selection { background: #2dd4bf; color: #0f172a; }
.page { max-width: 1100px; padding: 0 48px; margin: 0 auto; }
.skip-link { position: absolute; top: -100px; left: 24px; background: #0f172a; padding: 12px; z-index: 1; }
.skip-link:focus { top: 12px; }
header { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 32px 0; }
.brand { display: inline-flex; align-items: center; gap: 12px; color: #e2e8f0; text-decoration: none; font-size: 24px; font-weight: 650; letter-spacing: -.04em; }
.back-link { font-size: 13px; }
.hero { padding: 64px 0 32px; max-width: 780px; }
.eyebrow { color: #2dd4bf; font: 12px ui-monospace, SFMono-Regular, Consolas, monospace; letter-spacing: .08em; margin: 0 0 20px; }
h1 { margin: 0 0 24px; font-size: clamp(44px, 6vw, 72px); line-height: 1.1; font-weight: 650; letter-spacing: -.045em; }
h2 { color: #e2e8f0; font-size: clamp(26px, 3.5vw, 38px); line-height: 1.2; letter-spacing: -.03em; font-weight: 600; margin: 0 0 24px; }
h3 { color: #e2e8f0; font-size: 18px; line-height: 1.4; margin: 0 0 12px; font-weight: 600; }
p { color: #aab8cb; font-size: 16px; line-height: 1.8; margin: 0 0 18px; max-width: 780px; }
.lead { font-size: 22px; color: #e2e8f0; line-height: 1.6; }
.contents { display: flex; flex-wrap: wrap; gap: 16px 28px; padding: 24px 0; border-top: 1px solid #334155; border-bottom: 1px solid #334155; font-size: 14px; }
main > section:not(.hero) { padding: 56px 0; border-bottom: 1px solid #334155; scroll-margin-top: 24px; }
.cards { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 28px; margin-top: 32px; }
.cards article { padding-top: 24px; border-top: 1px solid #475569; }
.cards p { font-size: 14px; margin-bottom: 0; }
.flow { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; list-style-position: inside; padding: 0; margin: 32px 0 16px; }
.flow li { padding: 20px; border: 1px solid #334155; border-radius: 8px; color: #2dd4bf; font-size: 13px; }
.flow strong { display: block; color: #e2e8f0; font-size: 15px; margin: 12px 0 8px; }
.flow span { color: #aab8cb; line-height: 1.7; display: block; }
.aside { font-size: 13px; color: #94a3b8; }
.decision { margin-top: 32px; max-width: 780px; }
.decision p:last-child { margin-bottom: 0; }
strong { color: #e2e8f0; font-weight: 600; }
footer { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 16px; padding: 28px 0; }
footer p { font-size: 12px; margin: 0; }
footer nav { display: flex; gap: 24px; font-size: 13px; }
@media (max-width: 800px) {
  .flow { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cards { grid-template-columns: 1fr; gap: 24px; }
}
@media (max-width: 520px) {
  .page { padding: 0 24px; }
  header { flex-wrap: wrap; gap: 16px; padding: 24px 0; }
  .hero { padding: 40px 0 24px; }
  .lead { font-size: 20px; }
  main > section:not(.hero) { padding: 40px 0; }
  .flow { grid-template-columns: 1fr; }
}