:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #1a2230;
  --ink-2: #4a5566;
  --ink-3: #7c8697;
  --rule: #dfe3ea;
  --accent: #1f4f9c;
  --accent-soft: #e5edfa;
  --merged: #1f7a4a;
  --merged-soft: #e2f3e9;
  --review: #9a5b00;
  --review-soft: #fdf0d8;
  --code-bg: #eef1f5;
  --shadow: 0 1px 2px rgba(20, 30, 50, .06);
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #12161d;
    --surface: #1a2029;
    --ink: #e6e9ee;
    --ink-2: #aab3c0;
    --ink-3: #7c8697;
    --rule: #2b333f;
    --accent: #7ea6e6;
    --accent-soft: #1d2a40;
    --merged: #6cc48f;
    --merged-soft: #173224;
    --review: #e2b25a;
    --review-soft: #3a2c12;
    --code-bg: #232a35;
    --shadow: none;
  }
}
:root[data-theme="dark"] {
  --bg: #12161d;
  --surface: #1a2029;
  --ink: #e6e9ee;
  --ink-2: #aab3c0;
  --ink-3: #7c8697;
  --rule: #2b333f;
  --accent: #7ea6e6;
  --accent-soft: #1d2a40;
  --merged: #6cc48f;
  --merged-soft: #173224;
  --review: #e2b25a;
  --review-soft: #3a2c12;
  --code-bg: #232a35;
  --shadow: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; border-bottom: 1px solid transparent; }
a:hover, a:focus-visible { border-bottom-color: currentColor; }
a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
code, .mono {
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  font-size: .88em;
  background: var(--code-bg);
  padding: .1em .35em;
  border-radius: 3px;
}
h1, h2, h3 {
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
  font-weight: 600;
  line-height: 1.2;
  text-wrap: balance;
  margin: 0;
}
h1 { font-size: clamp(2rem, 4.5vw, 3rem); letter-spacing: -.01em; }
h2 { font-size: 1.7rem; margin-top: 3.5rem; padding-top: 1.5rem; border-top: 1px solid var(--rule); }
h3 { font-size: 1.2rem; margin-top: 2.2rem; color: var(--ink); }
h4 { font-size: .8rem; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-3); margin: 2rem 0 .6rem; font-weight: 600; }
p { margin: .9rem 0; }
ul { padding-left: 1.3rem; }
li { margin: .35rem 0; }
li::marker { color: var(--ink-3); }

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.25rem 5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 960px) {
  .wrap { grid-template-columns: 220px minmax(0, 68ch); gap: 3.5rem; }
}

/* header */
.masthead {
  border-bottom: 1px solid var(--rule);
  background: var(--surface);
}
.masthead-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 3rem 1.25rem 2.25rem;
}
.eyebrow {
  font-size: .78rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: .75rem;
}
.meta {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem 2rem;
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--rule);
}
.meta dt { font-size: .75rem; text-transform: uppercase; letter-spacing: .08em; color: var(--ink-3); margin-bottom: .2rem; }
.meta dd { margin: 0; font-size: 1rem; }
.toolbar { display: flex; justify-content: flex-end; margin-top: 1rem; }
.theme-btn {
  font: inherit; font-size: .8rem;
  color: var(--ink-2); background: transparent;
  border: 1px solid var(--rule); border-radius: 999px;
  padding: .3rem .8rem; cursor: pointer;
}
.theme-btn:hover { border-color: var(--ink-3); }
.theme-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* toc */
.toc { display: none; }
@media (min-width: 960px) {
  .toc {
    display: block;
    position: sticky;
    top: 1.5rem;
    align-self: start;
    padding-top: 3.5rem;
    font-size: .88rem;
  }
  .toc h4 { margin-top: 0; }
  .toc ol { list-style: none; padding: 0; margin: 0; }
  .toc li { margin: 0; }
  .toc a {
    display: block; padding: .3rem 0 .3rem .75rem;
    color: var(--ink-2); border-left: 2px solid var(--rule); border-bottom: 0;
  }
  .toc a:hover { color: var(--ink); }
  .toc a.active { color: var(--accent); border-left-color: var(--accent); }
}

/* stats */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: .75rem;
}
@media (min-width: 720px) {
  .stats { grid-template-columns: repeat(5, 1fr); }
  .stat span { font-size: .7rem; }
  margin: 1.5rem 0;
}
.stat {
  background: var(--surface);
  border: 1px solid var(--rule);
  border-radius: 6px;
  padding: .9rem 1rem;
  box-shadow: var(--shadow);
}
.stat b { display: block; font-size: 1.7rem; font-weight: 600; font-variant-numeric: tabular-nums; line-height: 1.1;
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif; }
.stat span { font-size: .78rem; color: var(--ink-3); text-transform: uppercase; letter-spacing: .06em; }

/* deliverables */
.deliv { list-style: none; padding: 0; margin: 1rem 0; counter-reset: d; }
.deliv li {
  counter-increment: d;
  position: relative; padding: .55rem 0 .55rem 2rem;
  border-bottom: 1px dashed var(--rule);
}
.deliv li::before {
  content: counter(d);
  position: absolute; left: 0;
  font-family: ui-monospace, Menlo, monospace; font-size: .85rem;
  color: var(--accent); font-weight: 600; padding-top: .15rem;
}

/* contribution lists */
.prs { list-style: none; padding: 0; margin: .5rem 0 0; }
.prs li {
  display: grid;
  grid-template-columns: 7rem 1fr auto;
  gap: .75rem;
  align-items: baseline;
  padding: .45rem 0;
  border-bottom: 1px solid var(--rule);
  font-size: .95rem;
}
.prs li:last-child { border-bottom: 0; }
.prs .num { font-family: ui-monospace, Menlo, monospace; font-size: .85rem; }
.pill {
  font-size: .68rem; text-transform: uppercase; letter-spacing: .06em; font-weight: 600;
  padding: .12rem .5rem; border-radius: 999px; white-space: nowrap;
}
.pill.merged { color: var(--merged); background: var(--merged-soft); }
.pill.review { color: var(--review); background: var(--review-soft); }
.pill.issue { color: var(--ink-2); background: var(--code-bg); }
.pill.upstream { color: var(--accent); background: var(--accent-soft); }
@media (max-width: 560px) {
  .prs li { grid-template-columns: 1fr auto; }
  .prs .num { grid-column: 1 / -1; }
}

/* misc */
.callout {
  background: var(--accent-soft);
  border-left: 3px solid var(--accent);
  padding: .8rem 1rem;
  border-radius: 0 6px 6px 0;
  margin: 1.2rem 0;
  font-size: .95rem;
}
.footer { margin-top: 4rem; padding-top: 1.5rem; border-top: 1px solid var(--rule); font-size: .85rem; color: var(--ink-3); }