:root {
  color-scheme: dark;
  --bg: #030712;
  --text: #eef6ff;
  --muted: #93a4b8;
  --line: rgba(148, 163, 184, .2);
  --accent: #22d3ee;
  --accent2: #34d399;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at 18% -12%, rgba(34, 211, 238, .24), transparent 32%),
    radial-gradient(circle at 88% -10%, rgba(167, 139, 250, .22), transparent 30%),
    linear-gradient(180deg, #060b18 0%, #030712 60%, #01030a 100%);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
.shell { width: min(1120px, calc(100vw - 32px)); margin: 0 auto; padding: 28px 0; }
nav { display: flex; justify-content: space-between; align-items: center; gap: 16px; margin-bottom: 70px; }
a { color: inherit; text-decoration: none; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 900; }
.brand img { width: 34px; height: 34px; }
.navlinks { display: flex; gap: 18px; color: var(--muted); font-weight: 700; }
.hero-grid { display: grid; grid-template-columns: minmax(0, 1.1fr) minmax(320px, .9fr); gap: 34px; align-items: center; }
.eyebrow { color: var(--accent); text-transform: uppercase; letter-spacing: .12em; font-weight: 900; font-size: 12px; }
h1 { font-size: clamp(42px, 7vw, 74px); line-height: .95; letter-spacing: 0; margin: 0 0 18px; }
.lead { color: var(--muted); font-size: 18px; line-height: 1.65; max-width: 680px; }
.actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.button { border: 1px solid var(--line); border-radius: 12px; padding: 12px 16px; font-weight: 900; background: rgba(15, 23, 42, .78); }
.button.primary { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #021014; border-color: transparent; }
.terminal, .panel {
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(2, 6, 23, .78);
  box-shadow: 0 32px 120px rgba(0,0,0,.42);
}
.terminal { padding: 24px; color: #bbf7d0; line-height: 1.6; overflow: auto; }
.panel { padding: 34px; margin-top: 28px; }
h2 { font-size: clamp(28px, 4vw, 44px); line-height: 1; margin: 0 0 16px; }
.hash { margin-top: 24px; display: grid; gap: 8px; color: var(--muted); }
code { display: block; overflow-wrap: anywhere; color: #dbeafe; }
.mermaid {
  padding: 22px;
  overflow: auto;
  color: #bae6fd;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: rgba(2, 6, 23, .68);
}
.rules-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}
.rules-grid > div {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  background: rgba(15, 23, 42, .58);
}
.rules-grid p { color: var(--muted); line-height: 1.55; }
.copy { margin: 8px 0 14px; }
.demo-actions { display: flex; gap: 12px; flex-wrap: wrap; margin: 20px 0; }
.demo-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; }
.demo-grid label { display: grid; gap: 8px; color: var(--muted); font-weight: 800; }
.demo-grid textarea,
.demo-grid pre {
  min-height: 420px;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 16px;
  overflow: auto;
  background: #020617;
  color: #dbeafe;
  font: 13px/1.55 "Cascadia Mono", Consolas, monospace;
  white-space: pre;
}
.demo-diff { display: block; color: #bbf7d0; background: rgba(52, 211, 153, .1); border-left: 2px solid #34d399; padding-left: 8px; }
.demo-stats { margin-top: 14px; color: var(--muted); font-weight: 800; }
@media (max-width: 820px) {
  nav, .hero-grid { grid-template-columns: 1fr; }
  .hero-grid { display: grid; }
  .rules-grid { grid-template-columns: 1fr; }
  .demo-grid { grid-template-columns: 1fr; }
}