:root {
  --bg: #ffffff;
  --text: #1f2328;
  --muted: #59636e;
  --line: #d1d9e0;
  --accent: #0969da;
  --accent-tint: #ddf4ff;
  --code-bg: #f6f8fa;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0d1117;
    --text: #e6edf3;
    --muted: #9198a1;
    --line: #3d444d;
    --accent: #4493f8;
    --accent-tint: #0f2a4a;
    --code-bg: #151b23;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.6 system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

main, footer { max-width: 760px; margin: 0 auto; padding-left: 20px; padding-right: 20px; }
main { padding-top: 40px; padding-bottom: 24px; }
footer { padding-top: 16px; padding-bottom: 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }

h1 { font-size: 30px; line-height: 1.25; margin: 0 0 8px; }
h2 { font-size: 21px; line-height: 1.3; margin: 36px 0 8px; }
p, ul { margin: 0 0 14px; }
li { margin-bottom: 4px; }
a { color: var(--accent); }

.crumbs { font-size: 14px; margin-bottom: 8px; }
.meta { color: var(--muted); margin-bottom: 28px; }
.lead { font-size: 18px; }

code {
  font: 0.9em ui-monospace, SFMono-Regular, Consolas, "Liberation Mono", monospace;
  background: var(--code-bg);
  padding: 1px 5px;
  border-radius: 4px;
}

.table-wrap { overflow-x: auto; margin: 0 0 14px; }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; vertical-align: top; padding: 8px 10px; border-bottom: 1px solid var(--line); }
th { font-weight: 600; }

.links { list-style: none; padding: 0; display: flex; flex-wrap: wrap; gap: 12px; margin: 20px 0; }
.links a { display: inline-block; padding: 8px 14px; border: 1px solid var(--line); border-radius: 8px; text-decoration: none; }
.links a.primary { background: var(--accent); border-color: var(--accent); color: #ffffff; }

/* Where-data-goes figure: the phone on the left, its destinations on the right. */
.flow { display: grid; grid-template-columns: 1fr auto 1.5fr; gap: 16px; align-items: center; margin: 20px 0; }
.flow ul { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.flow li { margin: 0; }
.flow .node { border: 1px solid var(--line); border-radius: 8px; padding: 12px 14px; }
.flow .node strong { display: block; }
.flow .node span { display: block; font-size: 15px; }
.flow .node small { display: block; color: var(--muted); font-size: 13px; }
.flow .main { border: 2px solid var(--accent); background: var(--accent-tint); }
.flow .arrow { color: var(--muted); font-size: 24px; }
.flow figcaption { grid-column: 1 / -1; color: var(--muted); font-size: 14px; }

@media (max-width: 600px) {
  .flow { grid-template-columns: 1fr; }
  .flow .arrow { justify-self: center; transform: rotate(90deg); }
}