:root {
  --bg: #0b0d12;
  --bg-elev: #141823;
  --bg-elev-2: #1c2230;
  --fg: #eef1f7;
  --fg-dim: #9aa3b6;
  --accent: #4f8cff;
  --accent-2: #7aa7ff;
  --border: #232a3a;
  --radius: 14px;
  --max: 1100px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}

a { color: var(--accent-2); text-decoration: none; }
a:hover { color: var(--accent); }

/* Header */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max);
  margin: 0 auto;
  padding: 22px 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--fg);
  font-weight: 700;
}
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: linear-gradient(135deg, var(--accent), #2c66d8);
  font-size: 14px;
  color: white;
  box-shadow: 0 6px 18px rgba(79, 140, 255, 0.35);
}
.brand-name { font-size: 18px; letter-spacing: 0.2px; }
.site-header nav { display: flex; gap: 22px; }
.site-header nav a {
  color: var(--fg-dim);
  font-size: 15px;
  font-weight: 500;
}
.site-header nav a:hover,
.site-header nav a[aria-current="page"] { color: var(--fg); }

/* Hero */
main { max-width: var(--max); margin: 0 auto; padding: 24px; }

.hero {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  align-items: center;
  padding: 48px 0 72px;
}
.hero h1 {
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
}
.lede {
  font-size: 19px;
  color: var(--fg-dim);
  max-width: 50ch;
  margin: 0 0 28px;
}
.cta-row {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}
.badge {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  padding: 10px 18px;
  border-radius: 12px;
  background: #ffffff;
  color: #0b0d12;
  font-weight: 600;
  line-height: 1.1;
}
.badge:hover { color: #0b0d12; background: #f1f3f9; }
.badge-small { font-size: 11px; opacity: 0.7; }
.badge-large { font-size: 22px; }
.ghost {
  color: var(--fg);
  padding: 12px 4px;
  font-weight: 500;
}
.meta { color: var(--fg-dim); font-size: 14px; margin-top: 24px; }

/* Hero art — sliding tile grid */
.hero-art { display: grid; place-items: center; }
.grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
  padding: 16px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 22px;
  width: min(360px, 100%);
  aspect-ratio: 1 / 1;
  box-shadow:
    0 30px 80px rgba(0, 0, 0, 0.45),
    0 0 0 1px rgba(255, 255, 255, 0.02) inset;
}
.grid span {
  display: grid;
  place-items: center;
  background: linear-gradient(180deg, #243149, #1a2335);
  border-radius: 12px;
  font-weight: 700;
  font-size: 22px;
  color: var(--fg);
  border: 1px solid rgba(255, 255, 255, 0.04);
}
.grid .empty { background: transparent; border-color: transparent; }

/* Sections */
section { padding: 48px 0; border-top: 1px solid var(--border); }
section h2 {
  font-size: clamp(26px, 3vw, 34px);
  letter-spacing: -0.01em;
  margin: 0 0 8px;
}

.feature-grid,
.mutator-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
  margin-top: 24px;
}
.feature-grid article,
.mutator-grid article {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.feature-grid h3,
.mutator-grid h3 {
  margin: 0 0 6px;
  font-size: 17px;
  color: var(--accent-2);
}
.feature-grid p,
.mutator-grid p {
  margin: 0;
  color: var(--fg-dim);
  font-size: 15px;
}

/* Doc pages */
.doc { max-width: 720px; padding-top: 24px; padding-bottom: 64px; }
.doc h1 {
  font-size: clamp(32px, 4vw, 44px);
  letter-spacing: -0.02em;
  margin: 12px 0 8px;
}
.doc h2 {
  font-size: 20px;
  margin: 36px 0 8px;
  color: var(--fg);
}
.doc h3 {
  font-size: 17px;
  margin: 24px 0 4px;
  color: var(--accent-2);
}
.doc p { color: var(--fg); }
.doc .lede { color: var(--fg-dim); }
.doc .meta { color: var(--fg-dim); font-size: 14px; margin-top: 0; }
.doc section { padding: 0; border-top: none; }

/* Footer */
.site-footer {
  max-width: var(--max);
  margin: 24px auto 0;
  padding: 28px 24px 48px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--fg-dim);
  font-size: 14px;
}
.site-footer nav { display: flex; gap: 20px; }
.site-footer a { color: var(--fg-dim); }
.site-footer a:hover { color: var(--fg); }

/* Responsive */
@media (max-width: 760px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 32px;
    padding: 24px 0 48px;
  }
  .site-header { flex-wrap: wrap; gap: 12px; }
  .site-header nav { gap: 16px; }
}