:root{
  --bg: #0b0d12;
  --panel: rgba(255,255,255,0.06);
  --panel-2: rgba(255,255,255,0.09);
  --text: rgba(255,255,255,0.92);
  --muted: rgba(255,255,255,0.70);
  --faint: rgba(255,255,255,0.55);
  --border: rgba(255,255,255,0.12);
  --shadow: 0 18px 60px rgba(0,0,0,0.55);
  --radius: 18px;
  --max: 860px;
}

*{ box-sizing: border-box; }
html, body{ height: 100%; }

body{
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial;
  color: var(--text);
  background:
    radial-gradient(900px 600px at 10% 10%, rgba(140,120,255,0.18), transparent 60%),
    radial-gradient(800px 500px at 90% 20%, rgba(40,200,255,0.15), transparent 55%),
    radial-gradient(700px 500px at 40% 120%, rgba(255,90,140,0.10), transparent 60%),
    var(--bg);
  line-height: 1.6;
}

a{ color: inherit; text-decoration: none; }
a:hover{ text-decoration: underline; }

.container{
  width: min(var(--max), calc(100% - 2rem));
  margin: 0 auto;
}

.card{
  margin: 2rem 0 3.5rem;
  background: linear-gradient(180deg, rgba(255,255,255,0.07), rgba(255,255,255,0.04));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.hero{
  padding: 2.2rem 2rem 1.2rem;
  border-bottom: 1px solid var(--border);
}

h1{
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 0.25rem;
}

.subtitle{
  color: var(--muted);
  margin-bottom: 1rem;
}

.prose{
  padding: 1.6rem 2rem;
}

.prose h2{
  margin-top: 1.5rem;
}

.prose ul{
  margin-left: 1.2rem;
}

.callout{
  margin: 1rem 0;
  padding: 0.9rem 1rem;
  background: var(--panel-2);
  border-radius: 14px;
  border: 1px solid var(--border);
}

.callout.danger{
  border-color: rgba(255,90,140,0.35);
  background: rgba(255,90,140,0.12);
}

blockquote{
  padding: 0.8rem 1rem;
  border-left: 3px solid rgba(255,255,255,0.3);
  background: var(--panel);
  border-radius: 12px;
}

@media (max-width: 720px){
  .hero, .prose{
    padding: 1.2rem;
  }
}