:root {
  color-scheme: light dark;
  --ink: #1d252c;
  --muted: #5d6873;
  --line: #d7dde2;
  --paper: #f8fafb;
  --surface: #ffffff;
  --accent: #0f766e;
  --warn: #9a3412;
  --warn-bg: #fff7ed;
  --warn-line: #fed7aa;
}

:root[data-theme="dark"] {
  --ink: #e6edf3;
  --muted: #aab7c4;
  --line: #34414f;
  --paper: #111820;
  --surface: #0b1117;
  --accent: #5eead4;
  --warn: #fdba74;
  --warn-bg: #2a1a10;
  --warn-line: #7c3f12;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --ink: #e6edf3;
    --muted: #aab7c4;
    --line: #34414f;
    --paper: #111820;
    --surface: #0b1117;
    --accent: #5eead4;
    --warn: #fdba74;
    --warn-bg: #2a1a10;
    --warn-line: #7c3f12;
  }
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--surface);
  font-size: 15px;
  line-height: 1.55;
}

header, main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 20px;
}

header {
  padding-top: 36px;
  border-bottom: 1px solid var(--line);
}

h1 {
  margin: 0 0 12px;
  font-size: 32px;
  line-height: 1.15;
  letter-spacing: 0;
}

h2 {
  margin-top: 32px;
  font-size: 21px;
  letter-spacing: 0;
}

p {
  max-width: 780px;
}

code, pre {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

pre {
  overflow-x: auto;
  padding: 14px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 6px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 18px 0;
  font-size: 14px;
}

th, td {
  text-align: left;
  vertical-align: top;
  padding: 12px;
  border-bottom: 1px solid var(--line);
}

th {
  background: var(--paper);
}

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

.topline {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 14px;
}

.theme-toggle {
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font: 500 13px/1 ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  min-height: 30px;
  padding: 0 11px;
}

.theme-toggle:hover {
  border-color: var(--accent);
  color: var(--ink);
}

.tier {
  display: inline-block;
  padding: 2px 8px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 13px;
  color: var(--muted);
}

.branch-write {
  color: var(--warn);
  border-color: var(--warn-line);
  background: var(--warn-bg);
}