/* exec.email explainer — neutral-paper palette, GitHub-Markdown look.
   Light bg #FAFAF9 / Dark bg #050506 (symmetric per-channel offset 5,5,6);
   text inverts to the opposite background colour. Dark/light follow the
   browser via prefers-color-scheme (no toggle). No JavaScript. */

:root {
  color-scheme: light dark;
  --bg: #FAFAF9;
  --fg: #050506;
  --fg-muted: #5b5b5d;
  --border: #e6e6e2;
  --link: #0a66c2;
  --code-bg: #f0f0ea;
  --code-fg: #1a1a1b;
  --quote-fg: #5b5b5d;
  --quote-border: #d9d9d3;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #050506;
    --fg: #FAFAF9;
    --fg-muted: #9b9b9e;
    --border: #26262a;
    --link: #6cb0ff;
    --code-bg: #161619;
    --code-fg: #e9e9e7;
    --quote-fg: #9b9b9e;
    --quote-border: #2c2c31;
  }
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans",
    Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.markdown-body {
  max-width: 720px;
  margin: 0 auto;
  padding: 4rem 1.5rem 6rem;
  overflow-wrap: break-word;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  line-height: 1.25;
  font-weight: 600;
  margin: 2em 0 0.6em;
}

.markdown-body h1 {
  margin-top: 0;
  font-size: 2.1rem;
  letter-spacing: -0.01em;
}

.markdown-body h2 {
  font-size: 1.4rem;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
}

.markdown-body h3 { font-size: 1.15rem; }

/* the italic subtitle directly under the H1 reads as a muted lead line */
.markdown-body h1 + p {
  margin-top: 0;
  color: var(--fg-muted);
  font-size: 1.15rem;
}

.markdown-body p { margin: 0 0 1.1em; }

.markdown-body a { color: var(--link); text-decoration: none; }
.markdown-body a:hover { text-decoration: underline; }

.markdown-body strong { font-weight: 600; }

.markdown-body ul { padding-left: 1.4em; margin: 0 0 1.1em; }
.markdown-body li { margin: 0.35em 0; }

.markdown-body code {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  color: var(--code-fg);
  padding: 0.15em 0.4em;
  border-radius: 5px;
}

.markdown-body pre {
  background: var(--code-bg);
  padding: 1em 1.2em;
  border-radius: 8px;
  overflow: auto;
}
.markdown-body pre code { background: none; padding: 0; font-size: 0.85em; }

.markdown-body blockquote {
  margin: 0 0 1.1em;
  padding: 0.2em 1em;
  color: var(--quote-fg);
  border-left: 3px solid var(--quote-border);
}

.markdown-body table {
  border-collapse: collapse;
  margin: 0 0 1.1em;
  display: block;
  overflow: auto;
}
.markdown-body th,
.markdown-body td { border: 1px solid var(--border); padding: 0.5em 0.8em; }
.markdown-body th { font-weight: 600; }

.markdown-body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2em 0;
}

@media (max-width: 760px) {
  body { font-size: 16px; }
  .markdown-body { padding: 2.5rem 1.15rem 4rem; }
  .markdown-body h1 { font-size: 1.8rem; }
  .markdown-body h2 { font-size: 1.25rem; }
  .markdown-body h1 + p { font-size: 1.05rem; }
}