:root {
  color-scheme: dark;
  --bg: #05070d;
  --bg-panel: #0b1020;
  --panel: rgba(13, 20, 38, 0.88);
  --panel-strong: rgba(20, 29, 54, 0.96);
  --text: #e6eef8;
  --muted: #9fb1c9;
  --cyan: #33d6ff;
  --blue: #5a8cff;
  --violet: #a66cff;
  --amber: #ffbf57;
  --crimson: #ff4d6d;
  --line: rgba(99, 214, 255, 0.24);
  --line-strong: rgba(99, 214, 255, 0.46);
  --shadow: 0 0 28px rgba(51, 214, 255, 0.12), inset 0 0 24px rgba(90, 140, 255, 0.05);

  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background:
    radial-gradient(circle at 15% 10%, rgba(51, 214, 255, 0.12), transparent 32rem),
    radial-gradient(circle at 85% 0%, rgba(166, 108, 255, 0.12), transparent 28rem),
    linear-gradient(180deg, #05070d 0%, #070b15 54%, #03050a 100%);
  color: var(--text);
  line-height: 1.6;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(99, 214, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(99, 214, 255, 0.03) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to bottom, rgba(0,0,0,.8), transparent 75%);
}

a { color: var(--cyan); text-decoration: none; }
a:hover { color: #fff; text-shadow: 0 0 14px rgba(51,214,255,.5); }

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  border-bottom: 1px solid var(--line);
  background: rgba(5, 7, 13, 0.86);
  backdrop-filter: blur(14px);
}
.nav {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}
.brand { display: flex; flex-direction: column; gap: .05rem; color: var(--text); }
.brand strong { letter-spacing: .12em; text-transform: uppercase; font-size: .86rem; }
.brand span { color: var(--muted); font-size: .75rem; letter-spacing: .09em; text-transform: uppercase; }
.nav-links { display: flex; flex-wrap: wrap; gap: .8rem; justify-content: flex-end; }
.nav-links a { color: var(--muted); font-size: .9rem; }
.nav-links a.external-link {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .2rem .55rem;
  color: var(--cyan);
}
.nav-links a.external-link::after { content: " ↗"; }
.nav-links a[aria-current="page"], .nav-links a:hover { color: var(--cyan); }

main { max-width: 1180px; margin: 0 auto; padding: 3rem 1.25rem 5rem; }
.hero {
  min-height: 52vh;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, .8fr);
  gap: 1.8rem;
  align-items: center;
}
.hero-card, .panel, .metric, .ledger-row, .callout {
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: var(--shadow);
  border-radius: 18px;
}
.hero-card { padding: clamp(1.5rem, 4vw, 3rem); position: relative; overflow: hidden; }
.hero-card::after {
  content: "";
  position: absolute;
  inset: auto -20% -45% 35%;
  height: 18rem;
  background: radial-gradient(circle, rgba(51,214,255,.18), transparent 65%);
}
.eyebrow { color: var(--cyan); letter-spacing: .16em; text-transform: uppercase; font-weight: 700; font-size: .78rem; }
h1, h2, h3 { line-height: 1.12; margin: 0 0 1rem; }
h1 { font-size: clamp(2.45rem, 8vw, 5.8rem); letter-spacing: -0.06em; max-width: 11ch; }
h2 { font-size: clamp(1.75rem, 4vw, 3rem); margin-top: 3rem; }
h3 { font-size: 1.15rem; color: #fff; }
p { color: var(--muted); margin: 0 0 1rem; }
.lede { font-size: clamp(1.05rem, 2vw, 1.3rem); color: #d4e2f7; max-width: 72ch; }

.cta-row { display: flex; flex-wrap: wrap; gap: .85rem; margin-top: 1.5rem; }
.button {
  display: inline-flex;
  align-items: center;
  gap: .45rem;
  padding: .78rem 1rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(51,214,255,.08);
  color: #fff;
  font-weight: 700;
  letter-spacing: .03em;
}
.button.secondary { background: rgba(166,108,255,.08); border-color: rgba(166,108,255,.38); }
.grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; margin-top: 1.2rem; }
.grid.two { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.panel { padding: 1.2rem; }
.panel .kicker { color: var(--amber); font-size: .72rem; text-transform: uppercase; letter-spacing: .13em; font-weight: 800; }
.panel ul, .content ul { color: var(--muted); padding-left: 1.25rem; }
.panel li, .content li { margin: .35rem 0; }

.stat-stack { display: grid; gap: .8rem; }
.metric { padding: 1rem; }
.metric strong { display:block; font-size: 1.8rem; color: #fff; }
.metric span { color: var(--muted); font-size: .85rem; text-transform: uppercase; letter-spacing: .08em; }

.content { max-width: 920px; }
.content h1 { max-width: 14ch; }
.meta-rail {
  display: flex;
  flex-wrap: wrap;
  gap: .55rem;
  margin: 1rem 0 1.6rem;
}
.pill {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: .32rem .65rem;
  color: var(--muted);
  background: rgba(10, 16, 31, .74);
  font-size: .82rem;
}
.pill.good { border-color: rgba(51,255,170,.35); color: #8dffc9; }
.pill.warn { border-color: rgba(255,191,87,.4); color: var(--amber); }
.pill.hot { border-color: rgba(255,77,109,.45); color: var(--crimson); }

.ledger { display: grid; gap: .85rem; margin-top: 1rem; }
.ledger-row { padding: 1rem; display: grid; grid-template-columns: 11rem 1fr auto; gap: 1rem; align-items: start; }
.ledger-row code, code { color: #fff; background: rgba(51,214,255,.09); border: 1px solid var(--line); padding: .1rem .32rem; border-radius: 6px; }

.diagram {
  border: 1px solid var(--line);
  background: linear-gradient(135deg, rgba(51,214,255,.06), rgba(166,108,255,.04));
  border-radius: 18px;
  padding: 1.1rem;
  overflow-x: auto;
}
.diagram pre { margin: 0; color: #cfe9ff; font-size: .9rem; }

.callout { padding: 1.1rem; border-color: rgba(255,191,87,.36); background: rgba(255,191,87,.06); }
.site-footer { border-top: 1px solid var(--line); padding: 2rem 1.25rem; color: var(--muted); background: #03050a; }
.footer-inner { max-width: 1180px; margin: 0 auto; display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1rem; }

@media (max-width: 880px) {
  .hero, .grid, .grid.two { grid-template-columns: 1fr; }
  .nav { align-items: flex-start; flex-direction: column; }
  .ledger-row { grid-template-columns: 1fr; }
}