:root {
  --bg: #f6f6f6;
  --surface: #ffffff;
  --border: #e1e1e1;
  --text: #343348;
  --text-soft: #4d4d4d;
  --text-muted: #8c8c8c;
  --brubank: #614ad9;
  --brubank-soft: #f1effc;
  --code-bg: #f0eefd;
  --error: #cc3433;
  --success: #2bc470;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Roboto Mono", monospace;
  --sans: "SN Pro", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #131317;
    --surface: #1a1a1f;
    --border: #2a2a30;
    --text: #f4f3ff;
    --text-soft: #ccc;
    --text-muted: #888;
    --brubank: #9181e4;
    --brubank-soft: #251f3b;
    --code-bg: #25203b;
  }
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container { max-width: 880px; margin: 0 auto; padding: 0 24px; }

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 40px 0 28px;
}
.site-header h1 {
  margin: 0;
  font-size: 32px;
  font-weight: 600;
}
.site-header .tagline {
  margin: 8px 0 0;
  color: var(--text-muted);
  font-size: 16px;
}

.site-nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}
.nav-row {
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  padding: 8px 24px;
}
.nav-link {
  background: transparent;
  border: 1px solid transparent;
  border-radius: 999px;
  padding: 6px 14px;
  cursor: pointer;
  font: inherit;
  font-size: 13px;
  font-weight: 500;
  color: var(--text-soft);
  text-decoration: none;
  transition: background 0.12s, color 0.12s;
}
.nav-link:hover { background: var(--brubank-soft); color: var(--brubank); }
.nav-link.active {
  background: var(--brubank-soft);
  color: var(--brubank);
  font-weight: 600;
}
.nav-link.external::after { content: " ↗"; }

main.container { padding-top: 40px; padding-bottom: 80px; }

.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
  font-weight: 600;
  line-height: 1.3;
  margin-top: 2em;
  margin-bottom: 0.6em;
}
.markdown-body h1 { font-size: 28px; border-bottom: 1px solid var(--border); padding-bottom: 12px; }
.markdown-body h2 { font-size: 22px; }
.markdown-body h3 { font-size: 18px; }
.markdown-body p { margin: 0 0 1em; color: var(--text); }
.markdown-body blockquote {
  margin: 1em 0;
  padding: 8px 16px;
  border-left: 3px solid var(--brubank);
  background: var(--brubank-soft);
  color: var(--text-soft);
  font-style: italic;
}
.markdown-body code {
  font-family: var(--mono);
  font-size: 0.92em;
  background: var(--code-bg);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--text);
}
.markdown-body pre {
  background: var(--code-bg);
  border-radius: 8px;
  padding: 16px;
  overflow-x: auto;
  border: 1px solid var(--border);
}
.markdown-body pre code {
  background: transparent;
  padding: 0;
}
.markdown-body a { color: var(--brubank); text-decoration: none; }
.markdown-body a:hover { text-decoration: underline; }
.markdown-body table {
  border-collapse: collapse;
  width: 100%;
  margin: 1em 0;
  font-size: 14px;
}
.markdown-body th, .markdown-body td {
  border: 1px solid var(--border);
  padding: 8px 12px;
  text-align: left;
}
.markdown-body th { background: var(--brubank-soft); font-weight: 600; }
.markdown-body ul, .markdown-body ol { padding-left: 24px; }
.markdown-body hr { border: 0; border-top: 1px solid var(--border); margin: 2em 0; }
.markdown-body .loading { color: var(--text-muted); font-style: italic; }
.markdown-body .error {
  color: var(--error);
  background: #fdf2f2;
  border: 1px solid var(--error);
  border-radius: 8px;
  padding: 12px;
}

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 16px 0;
  color: var(--text-muted);
  font-size: 12px;
}
.site-footer .container { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.site-footer .dot { color: var(--border); }
.site-footer code { font-family: var(--mono); background: var(--code-bg); padding: 1px 4px; border-radius: 3px; }