:root {
  --ink: #15171c;
  --muted: #5f6673;
  --line: #e3e6eb;
  --bg: #ffffff;
  --soft: #f6f8fb;
  --accent: #1d4ed8;
  --accent-ink: #14339a;
  --good: #0f7b52;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 17px/1.62 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-feature-settings: "kern" 1;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--accent-ink); }

.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(255, 255, 255, .94);
  backdrop-filter: saturate(180%) blur(8px);
  border-bottom: 1px solid var(--line);
}
.bar {
  max-width: 960px; margin: 0 auto; padding: 13px 20px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.brand {
  font-weight: 750; font-size: 19px; letter-spacing: -.02em; color: var(--ink); text-decoration: none;
}
.brand span { color: var(--accent); }
nav { display: flex; gap: 18px; font-size: 14.5px; }
nav a { color: var(--muted); text-decoration: none; font-weight: 550; }
nav a:hover, nav a.on { color: var(--ink); }

.wrap { max-width: 920px; margin: 0 auto; padding: 0 20px; }

.crumb { font-size: 13px; color: var(--muted); padding: 18px 0 0; display: flex; gap: 8px; flex-wrap: wrap; }
.crumb a { color: var(--muted); text-decoration: none; }
.crumb span:last-child { color: var(--ink); }

.page-head { padding: 12px 0 6px; }
.eyebrow {
  margin: 0 0 6px; font-size: 12.5px; letter-spacing: .09em; text-transform: uppercase;
  color: var(--accent); font-weight: 700;
}
h1 {
  font-size: clamp(1.85rem, 4.6vw, 2.55rem); line-height: 1.12; letter-spacing: -.025em;
  margin: 0 0 12px; font-weight: 780;
}
.meta { color: var(--muted); font-size: 13.5px; margin: 0 0 10px; }

article { padding-bottom: 40px; }

h2 {
  font-size: 1.42rem; line-height: 1.25; letter-spacing: -.015em;
  margin: 2.4rem 0 .7rem; padding-top: 1.2rem; border-top: 1px solid var(--line);
}
h2:first-of-type { border-top: 0; padding-top: .4rem; }
h3 { font-size: 1.12rem; margin: 1.7rem 0 .5rem; }

p { margin: 0 0 1rem; }
ul, ol { padding-left: 1.25rem; margin: 0 0 1.1rem; }
li { margin: .3rem 0; }
li > ul { margin: .3rem 0 .4rem; }

strong { font-weight: 680; }

blockquote {
  margin: 1.4rem 0; padding: .85rem 1rem;
  border-left: 3px solid var(--accent); background: var(--soft);
  color: #2b3242; font-size: .96rem;
}
blockquote p { margin: 0; }

code {
  font-family: var(--mono); font-size: .86em;
  background: var(--soft); border: 1px solid var(--line);
  border-radius: 4px; padding: .08em .32em;
}
pre {
  background: #0f172a; color: #e6edf7; border-radius: 10px;
  padding: 16px 18px; overflow: auto; font-size: 12.5px; line-height: 1.55;
  margin: 1.2rem 0;
}
pre code { background: none; border: 0; padding: 0; color: inherit; font-size: inherit; }

.table-wrap { overflow-x: auto; margin: 1.2rem 0 1.6rem; border: 1px solid var(--line); border-radius: 10px; }
table { width: 100%; border-collapse: collapse; font-size: .86rem; font-variant-numeric: tabular-nums; }
thead th {
  text-align: left; background: var(--soft); color: #39414f;
  font-size: .78rem; letter-spacing: .03em; text-transform: uppercase;
  padding: 9px 10px; border-bottom: 1px solid var(--line); white-space: normal;
}
tbody td { padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
tbody tr:last-child td { border-bottom: 0; }
tbody tr:nth-child(even) { background: #fcfdff; }
td:first-child, th:first-child { padding-left: 14px; }

.site-footer { border-top: 1px solid var(--line); background: var(--soft); margin-top: 20px; }
.site-footer .wrap { padding: 26px 20px 34px; }
.site-footer p { font-size: 13.5px; color: var(--muted); margin: 0 0 .55rem; }
.site-footer strong { color: var(--ink); }
.site-footer .fine { font-size: 12px; color: #7b8290; }

@media (max-width: 620px) {
  body { font-size: 16px; }
  .bar { flex-wrap: wrap; }
  nav { gap: 12px; font-size: 13.5px; width: 100%; justify-content: flex-start; padding-bottom: 2px; }
  .bar { padding: 11px 16px; }
  .wrap { padding: 0 16px; }
  table { font-size: .84rem; }
  thead th, tbody td { padding: 8px 10px; }
  h1 { font-size: 1.72rem; }
}