:root {
  --bg: #0b1020;
  --bg-soft: #121832;
  --fg: #e7ecff;
  --muted: #9aa3c7;
  --accent: #4c8bf5;
  --accent-strong: #6aa0ff;
  --card: #161d3a;
  --border: #252d53;
  --code-bg: #0f1430;
  --radius: 14px;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: radial-gradient(1200px 600px at 70% -10%, #25347a 0%, transparent 60%), var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

.container {
  max-width: 920px;
  margin: 0 auto;
  padding: 0 24px;
}

.hero {
  padding: 56px 0 48px;
  border-bottom: 1px solid var(--border);
}
.brand {
  display: inline-block;
  font-weight: 700;
  font-size: 20px;
  color: var(--fg);
  margin-bottom: 32px;
  letter-spacing: -0.02em;
}
.brand span { color: var(--muted); font-weight: 500; }
.hero h1 {
  font-size: clamp(28px, 4.2vw, 44px);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
}
.lead {
  max-width: 640px;
  color: var(--muted);
  font-size: 18px;
  margin: 0 0 24px;
}
.actions { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  padding: 12px 20px;
  border-radius: 10px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform .1s ease, background .2s ease, border-color .2s ease;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-strong); }
.btn-secondary { background: transparent; color: var(--fg); border-color: var(--border); }
.btn-secondary:hover { border-color: var(--accent-strong); color: var(--accent-strong); }

main { padding: 40px 0 64px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}
.card h2 {
  margin: 0 0 16px;
  font-size: 22px;
  letter-spacing: -0.01em;
}
.card h3 {
  margin: 24px 0 8px;
  font-size: 16px;
  color: var(--muted);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.steps { padding-left: 20px; }
.steps li { margin-bottom: 8px; }

.note {
  margin-top: 12px;
  padding: 12px 14px;
  border-left: 3px solid var(--accent);
  background: rgba(76, 139, 245, 0.08);
  border-radius: 0 8px 8px 0;
  color: #cfd7ff;
  font-size: 14.5px;
}

code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  font-size: 14px;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 6px;
  color: #cbd5ff;
}
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 16px;
  overflow-x: auto;
  margin: 8px 0 16px;
}
pre code { background: transparent; padding: 0; color: #d6e0ff; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 8px;
}
.grid .card { margin: 0; }

.footer {
  border-top: 1px solid var(--border);
  color: var(--muted);
  padding: 24px 0;
  font-size: 14px;
}