:root {
  --bg: #0a0a0a;
  --fg: #e0e0e0;
  --accent: #4fc3f7;
  --card-bg: #1a1a1a;
  --border: #333;
  --code-bg: #111;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, monospace;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  max-width: 800px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

header { text-align: center; margin-bottom: 3rem; }
h1 { font-size: 2.5rem; color: var(--accent); letter-spacing: -1px; }
.tagline { color: #888; font-size: 1.1rem; margin-top: 0.5rem; }

h2 { color: var(--accent); margin: 2.5rem 0 1rem; font-size: 1.3rem; }
h3 { color: var(--fg); margin: 1.5rem 0 0.5rem; font-size: 1rem; }

.hero { font-size: 1.05rem; color: #bbb; margin-bottom: 2rem; }

.stats {
  display: flex; gap: 1rem; justify-content: center;
  margin: 2rem 0;
}
.stat-card {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: 8px; padding: 1.5rem 2rem; text-align: center;
  min-width: 120px;
}
.stat-number { display: block; font-size: 2rem; color: var(--accent); font-weight: bold; }
.stat-label { display: block; font-size: 0.8rem; color: #888; margin-top: 0.3rem; }

.steps { display: flex; gap: 1.5rem; margin: 1rem 0; }
.step {
  flex: 1; background: var(--card-bg); border: 1px solid var(--border);
  border-radius: 8px; padding: 1.5rem;
}
.step-num {
  display: inline-block; width: 28px; height: 28px; line-height: 28px;
  text-align: center; background: var(--accent); color: var(--bg);
  border-radius: 50%; font-weight: bold; font-size: 0.9rem; margin-bottom: 0.5rem;
}

pre, code {
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: 4px; font-size: 0.85rem;
}
pre { padding: 1rem; overflow-x: auto; margin: 0.5rem 0; }
code { padding: 0.15rem 0.4rem; }
pre code { padding: 0; border: none; background: none; }

.diagram { color: var(--accent); border-color: var(--accent); }

.links ul { list-style: none; }
.links li { margin: 0.5rem 0; }
.links a { color: var(--accent); text-decoration: none; }
.links a:hover { text-decoration: underline; }

footer { margin-top: 3rem; text-align: center; color: #555; font-size: 0.85rem; }

@media (max-width: 600px) {
  .stats, .steps { flex-direction: column; }
  body { padding: 1rem; }
  h1 { font-size: 1.8rem; }
}