:root {
  --bg: #ffffff;
  --fg: #1f2328;
  --muted: #59636e;
  --accent: #635bff;
  --sidebar-bg: #0a0e27;
  --sidebar-fg: #c1c4d6;
  --sidebar-active: #ffffff;
  --code-bg: #f6f8fa;
  --border: #d0d7de;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  line-height: 1.6;
}

.layout {
  display: grid;
  grid-template-columns: 16rem 1fr;
  min-height: 100vh;
}

@media (max-width: 800px) {
  .layout { grid-template-columns: 1fr; }
  .sidebar { position: static !important; height: auto !important; }
}

.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  overflow-y: auto;
  background: var(--sidebar-bg);
  color: var(--sidebar-fg);
  padding: 2rem 1.25rem;
  font-size: 0.92rem;
}

.brand {
  margin: 0 0 2rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: 1rem;
}
.brand a {
  color: var(--sidebar-active);
  text-decoration: none;
}

.sidebar nav {
  display: flex;
  flex-direction: column;
}

.section {
  margin: 1.5rem 0 0.4rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.45);
}
.section:first-of-type { margin-top: 0; }

.sidebar nav a {
  color: var(--sidebar-fg);
  text-decoration: none;
  padding: 0.35rem 0.65rem;
  border-radius: 4px;
  margin: 0.1rem 0;
}
.sidebar nav a:hover { color: var(--sidebar-active); background: rgba(255,255,255,0.04); }
.sidebar nav a.active {
  color: var(--sidebar-active);
  background: rgba(99, 91, 255, 0.18);
  font-weight: 600;
}

main {
  padding: 3rem clamp(1.5rem, 5vw, 4rem);
  max-width: 56rem;
}

.crumb {
  margin: 0 0 1.5rem;
  font-size: 0.85rem;
  color: var(--muted);
}
.crumb a { color: var(--accent); text-decoration: none; }

h1 {
  margin: 0 0 0.75rem;
  font-size: 2.25rem;
  letter-spacing: -0.02em;
}

.lead {
  margin: 0 0 2.5rem;
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 38rem;
}

h2 {
  margin: 2rem 0 1rem;
  font-size: 1.4rem;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1rem; }

code {
  font-family: ui-monospace, 'SF Mono', Menlo, monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.1em 0.35em;
  border-radius: 4px;
}

pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-size: 0.9rem;
  line-height: 1.55;
  margin: 0 0 1.5rem;
}
pre code { background: none; padding: 0; }

a { color: var(--accent); }

footer {
  padding: 2rem clamp(1.5rem, 5vw, 4rem) 4rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--muted);
  grid-column: 1 / -1;
}
footer a { color: var(--accent); text-decoration: none; }