:root {
  --fg: #1a1a1a;
  --fg-muted: #555;
  --bg: #fdfdfd;
  --bg-alt: #f5f5f5;
  --accent: #2a5d8f;
  --border: #e0e0e0;
  --max-w: 760px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --fg: #e8e8e8;
    --fg-muted: #a0a0a0;
    --bg: #1a1a1a;
    --bg-alt: #252525;
    --accent: #6ba8d6;
    --border: #3a3a3a;
  }
}

* { box-sizing: border-box; }

html { font-size: 16px; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--fg);
  background: var(--bg);
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

header {
  border-bottom: 1px solid var(--border);
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
}

.lang-switcher {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  font-size: 0.85rem;
  margin-bottom: 1.5rem;
}

.lang-switcher span {
  padding: 0.2rem 0.55rem;
  border-radius: 3px;
  border: 1px solid var(--border);
}

.lang-switcher .current {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  font-weight: 500;
}

.lang-switcher .disabled {
  color: var(--fg-muted);
  opacity: 0.55;
  cursor: not-allowed;
}

h1 {
  font-size: 2rem;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.tagline {
  color: var(--fg-muted);
  font-size: 1.05rem;
  margin: 0;
}

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

main section {
  margin-bottom: 2.5rem;
}

h2 {
  font-size: 1.4rem;
  margin: 0 0 0.8rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
}

p { margin: 0 0 1rem; }

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

a:hover { text-decoration: underline; }

ol.stages {
  list-style: none;
  padding: 0;
  counter-reset: stage;
}

ol.stages li {
  counter-increment: stage;
  padding: 0.75rem 0 0.75rem 2.4rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}

ol.stages li:last-child { border-bottom: none; }

ol.stages li::before {
  content: counter(stage);
  position: absolute;
  left: 0;
  top: 0.75rem;
  width: 1.8rem;
  height: 1.8rem;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--fg-muted);
}

ol.stages strong {
  display: block;
  margin-bottom: 0.2rem;
}

ol.stages .stage-doc {
  font-size: 0.85rem;
  color: var(--fg-muted);
  display: inline-block;
  margin-top: 0.3rem;
}

ul.arch {
  list-style: none;
  padding: 0;
}

ul.arch li {
  padding: 0.5rem 0;
  border-bottom: 1px solid var(--border);
}

ul.arch li:last-child { border-bottom: none; }

ul.arch strong {
  color: var(--accent);
}

code, pre {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.9em;
  background: var(--bg-alt);
}

code {
  padding: 0.1em 0.35em;
  border-radius: 3px;
}

pre {
  padding: 1rem;
  border-radius: 5px;
  overflow-x: auto;
  border: 1px solid var(--border);
}

blockquote {
  margin: 1rem 0;
  padding: 0.5rem 0 0.5rem 1rem;
  border-left: 3px solid var(--accent);
  color: var(--fg-muted);
  font-style: italic;
}

footer {
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--fg-muted);
  text-align: center;
}

footer a { color: var(--fg-muted); }
footer .stats-inline { margin-top: 0.6rem; font-size: 0.85rem; }
footer .stats-inline .num { color: #888; font-variant-numeric: tabular-nums; }