:root {
  --bg: #0d1017;
  --surface: #161b27;
  --panel: #1e2435;
  --line: #30384c;
  --text: #e8e2d9;
  --muted: #a39d94;
  --faint: #687083;
  --accent: #c8843a;
  --green: #5a9e7a;
  --sans: "Barlow", sans-serif;
  --cond: "Barlow Condensed", sans-serif;
  --mono: "JetBrains Mono", monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.65 var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; text-underline-offset: 4px; }
a:focus-visible, button:focus-visible, input:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.shell { width: min(1060px, calc(100% - 40px)); margin: 0 auto; }
.skip-nav { position: absolute; left: -9999px; top: 10px; z-index: 100; background: var(--accent); color: var(--bg); padding: 8px 12px; }
.skip-nav:focus { left: 10px; }
.site-nav { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding: 22px 0; border-bottom: 1px solid var(--line); }
.brand { color: var(--accent); font: 500 12px/1 var(--mono); letter-spacing: .12em; text-decoration: none; text-transform: uppercase; white-space: nowrap; }
.nav-links { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 10px 20px; }
.nav-links a { color: var(--muted); font: 500 11px/1.3 var(--mono); letter-spacing: .05em; text-decoration: none; text-transform: uppercase; }
.nav-links a:hover, .nav-links a[aria-current="page"] { color: var(--text); }
.hero { padding: 92px 0 64px; border-bottom: 1px solid var(--line); }
.eyebrow, .section-label, .kicker { color: var(--accent); font: 500 11px/1.4 var(--mono); letter-spacing: .14em; text-transform: uppercase; }
h1, h2, h3 { font-family: var(--cond); margin: 0; }
h1 { max-width: 920px; font-size: clamp(56px, 10vw, 108px); line-height: .88; letter-spacing: -.025em; text-transform: uppercase; }
h1 em { color: var(--accent); font-style: normal; }
.lede { max-width: 760px; margin: 28px 0 0; color: var(--muted); font-size: clamp(19px, 2.5vw, 24px); line-height: 1.45; }
.lede strong { color: var(--text); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.button { display: inline-block; border: 1px solid var(--accent); padding: 11px 16px; color: var(--text); font: 500 11px/1 var(--mono); letter-spacing: .06em; text-decoration: none; text-transform: uppercase; }
.button.primary { background: var(--accent); color: var(--bg); }
.section { padding: 64px 0; border-bottom: 1px solid var(--line); }
.section-head { display: flex; align-items: center; gap: 16px; margin-bottom: 22px; }
.section-rule { height: 1px; background: var(--line); flex: 1; }
h2 { font-size: clamp(38px, 6vw, 62px); line-height: 1; text-transform: uppercase; }
h3 { font-size: 25px; line-height: 1.15; }
.prose { max-width: 780px; color: var(--muted); }
.prose p { margin: 18px 0 0; }
.prose strong { color: var(--text); }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 30px; }
.grid.three { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card { display: block; background: var(--surface); border: 1px solid var(--line); padding: 26px; text-decoration: none; }
.card:hover { background: var(--panel); border-color: var(--accent); }
.card .num { display: block; color: var(--accent); font: 500 10px/1 var(--mono); letter-spacing: .12em; margin-bottom: 18px; text-transform: uppercase; }
.card p { color: var(--muted); margin: 12px 0 0; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.tag { border: 1px solid var(--line); color: var(--faint); font: 500 10px/1 var(--mono); padding: 7px 9px; text-transform: uppercase; }
.highlight { margin-top: 28px; border-left: 3px solid var(--accent); background: var(--surface); padding: 22px 24px; color: var(--muted); }
.highlight strong { color: var(--text); }
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); margin-top: 32px; border: 1px solid var(--line); }
.metric { padding: 22px; border-right: 1px solid var(--line); }
.metric:last-child { border-right: 0; }
.metric strong { display: block; color: var(--accent); font: 700 30px/1 var(--cond); }
.metric span { color: var(--muted); font-size: 13px; }
.puzzle { margin-top: 28px; max-width: 560px; border: 1px solid var(--line); background: var(--surface); padding: 22px; }
.puzzle summary { cursor: pointer; color: var(--text); font: 500 12px/1.4 var(--mono); letter-spacing: .08em; text-transform: uppercase; }
.puzzle-body { margin-top: 20px; }
.puzzle label { display: block; color: var(--muted); margin-bottom: 10px; }
.puzzle-row { display: flex; gap: 8px; }
.puzzle input { min-width: 0; flex: 1; border: 1px solid var(--line); background: var(--bg); color: var(--text); padding: 11px; font: 14px var(--mono); }
.puzzle button { border: 0; background: var(--accent); color: var(--bg); padding: 0 16px; font: 600 11px var(--mono); text-transform: uppercase; cursor: pointer; }
.puzzle-result { min-height: 24px; margin: 12px 0 0; color: var(--green); font: 12px var(--mono); }
.architecture { display: grid; grid-template-columns: repeat(4, 1fr); align-items: stretch; gap: 28px; margin-top: 30px; }
.architecture div { position: relative; background: var(--surface); border: 1px solid var(--line); padding: 18px; color: var(--muted); font-size: 14px; }
.architecture div:not(:last-child)::after { content: "\2192"; position: absolute; right: -23px; top: 50%; color: var(--accent); transform: translateY(-50%); }
.architecture strong { display: block; color: var(--text); margin-bottom: 6px; }
.site-footer { display: flex; justify-content: space-between; gap: 24px; padding: 30px 0 50px; color: var(--faint); font: 11px/1.5 var(--mono); }
.site-footer a { color: var(--muted); }

@media (max-width: 760px) {
  .site-nav { align-items: flex-start; }
  .nav-links { gap: 10px 14px; }
  .hero { padding-top: 64px; }
  .grid, .grid.three, .metrics, .architecture { grid-template-columns: 1fr; }
  .metric { border-right: 0; border-bottom: 1px solid var(--line); }
  .metric:last-child { border-bottom: 0; }
  .architecture div:not(:last-child)::after { content: "\2193"; right: auto; left: 50%; top: auto; bottom: -25px; transform: translateX(-50%); }
}

@media (max-width: 520px) {
  .site-nav { display: block; }
  .nav-links { justify-content: flex-start; margin-top: 18px; }
  .shell { width: min(100% - 28px, 1060px); }
  .section { padding: 48px 0; }
  .site-footer { display: block; }
}