:root {
  color-scheme: dark;
  --bg: #050b10;
  --panel: rgba(8, 18, 25, .86);
  --line: rgba(125, 171, 207, .22);
  --line-strong: rgba(125, 171, 207, .48);
  --text: #edf5fa;
  --muted: #9aa9b5;
  --quiet: #71818e;
  --blue: #9fd9f7;
  --gold: #d3b66f;
}
* { box-sizing: border-box; }
html { background: var(--bg); }
body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(1000px 700px at 72% 12%, rgba(22, 126, 173, .16), transparent 60%),
    radial-gradient(900px 700px at 10% 70%, rgba(10, 73, 111, .13), transparent 62%),
    #050b10;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
a { color: inherit; }
.shell { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }
.topline {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  border-bottom: 1px solid var(--line);
}
.identity, .nav, .eyebrow, .state, .problem-id, .fact dt, footer {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  letter-spacing: .12em;
  text-transform: uppercase;
}
.identity { font-size: 11px; color: var(--muted); text-decoration: none; }
.identity strong { color: var(--text); }
.nav { display: flex; gap: 16px; align-items: center; font-size: 9px; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover, .nav a:focus-visible { color: var(--text); }
.hero {
  padding: clamp(68px, 10vw, 122px) 0 48px;
  max-width: 830px;
}
.eyebrow { color: var(--quiet); font-size: 10px; margin-bottom: 18px; }
.state {
  display: inline-flex;
  margin-bottom: 20px;
  padding: 6px 8px;
  border: 1px solid rgba(211, 182, 111, .42);
  color: var(--gold);
  font-size: 9px;
}
h1 {
  margin: 0;
  max-width: 13ch;
  font-size: clamp(48px, 7vw, 88px);
  font-weight: 420;
  line-height: .92;
  letter-spacing: -.055em;
}
.lead {
  max-width: 68ch;
  margin: 28px 0 0;
  color: #b8c5cf;
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.55;
}
.grid { display: grid; gap: 12px; padding: 18px 0 70px; }
.problem {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 18px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  background: rgba(6, 15, 21, .46);
}
.problem-id { color: #89b6d2; font-size: 10px; }
.problem-title { color: #c7d2da; font-size: 15px; line-height: 1.4; }
.section {
  padding: 48px 0;
  border-top: 1px solid var(--line);
}
.section h2 {
  margin: 0 0 18px;
  font-size: clamp(28px, 4vw, 46px);
  font-weight: 430;
  letter-spacing: -.035em;
}
.section p { max-width: 72ch; color: var(--muted); line-height: 1.65; }
.path { counter-reset: path; margin: 24px 0 0; padding: 0; list-style: none; }
.path li {
  counter-increment: path;
  position: relative;
  padding: 18px 0 18px 54px;
  border-top: 1px solid var(--line);
  color: #b7c3cc;
  line-height: 1.55;
}
.path li::before {
  content: "0" counter(path);
  position: absolute;
  left: 0;
  top: 20px;
  color: #7095ae;
  font: 600 10px/1 ui-monospace, "Cascadia Mono", Consolas, monospace;
  letter-spacing: .12em;
}
.facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}
.fact {
  min-height: 132px;
  padding: 18px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.fact dt { color: var(--quiet); font-size: 9px; margin-bottom: 12px; }
.fact dd { margin: 0; color: #c3ced6; font-size: 14px; line-height: 1.5; }
.fact strong { color: var(--text); font-weight: 560; }
.notice {
  padding: 20px;
  border: 1px solid rgba(211, 182, 111, .33);
  background: rgba(57, 45, 24, .13);
  color: #c7b27d;
  line-height: 1.55;
}
footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 28px 0 40px;
  border-top: 1px solid var(--line);
  color: #667784;
  font-size: 8px;
}
@media (max-width: 720px) {
  .shell { width: min(100% - 24px, 1120px); }
  .topline { min-height: 62px; align-items: flex-start; padding-top: 18px; }
  .identity span { display: none; }
  .nav { gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
  .hero { padding-top: 62px; }
  h1 { font-size: clamp(44px, 15vw, 68px); }
  .problem { grid-template-columns: 78px 1fr; padding: 15px; gap: 10px; }
  .facts { grid-template-columns: 1fr; }
  footer { flex-direction: column; }
}