:root {
  --bg: #0b1020;
  --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, 0.7);
  --border: rgba(255, 255, 255, 0.14);
  --accent: #7dd3fc;
  --accent2: #a78bfa;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.35);
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
    "Apple Color Emoji", "Segoe UI Emoji";
  background:
    radial-gradient(1200px 600px at 15% 10%, rgba(167, 139, 250, 0.22), transparent 60%),
    radial-gradient(900px 500px at 90% 15%, rgba(125, 211, 252, 0.18), transparent 55%),
    radial-gradient(800px 600px at 50% 100%, rgba(34, 197, 94, 0.12), transparent 55%),
    var(--bg);
  color: var(--text);
}

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

.container {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
}

.header {
  padding: 40px 0 20px;
}

.badge {
  display: inline-block;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.06);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1 {
  margin: 14px 0 8px;
  font-size: clamp(28px, 3vw, 44px);
  line-height: 1.05;
}

.subtitle {
  margin: 0;
  max-width: 70ch;
  color: var(--muted);
}

.meta {
  margin: 10px 0 0;
  color: rgba(255, 255, 255, 0.55);
  font-size: 13px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 14px;
  padding: 18px 0 10px;
}

.card {
  grid-column: span 6;
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 16px;
  transition: transform 160ms ease, background 160ms ease, border-color 160ms ease;
}

.card:hover {
  transform: translateY(-2px);
  background: var(--panel-2);
  border-color: rgba(255, 255, 255, 0.22);
}

.card h2 {
  margin: 0 0 8px;
  font-size: 18px;
}

.card p {
  margin: 0 0 10px;
  color: var(--muted);
}

.card ul {
  margin: 0;
  padding-left: 18px;
  color: rgba(255, 255, 255, 0.82);
}

.card code {
  color: var(--accent);
}

kbd {
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-bottom-color: rgba(255, 255, 255, 0.15);
  border-radius: 6px;
  padding: 1px 6px;
  background: rgba(0, 0, 0, 0.35);
  font-size: 12px;
}

.callouts {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 14px;
  padding: 12px 0 40px;
}

.callout {
  grid-column: span 6;
  border: 1px solid var(--border);
  background: rgba(0, 0, 0, 0.25);
  border-radius: var(--radius);
  padding: 16px;
}

.callout h3 {
  margin: 0 0 10px;
  font-size: 15px;
}

.callout li {
  color: rgba(255, 255, 255, 0.82);
}

.footer {
  padding: 18px 0 40px;
  color: rgba(255, 255, 255, 0.55);
  font-size: 13px;
}

@media (max-width: 860px) {
  .card, .callout { grid-column: span 12; }
}