:root {
  --bg: #fbfaf7;
  --surface: #ffffff;
  --surface-2: #f3f1ec;
  --text: #1d2330;
  --muted: #474f5e;
  --border: #e4e0d8;
  --accent: #0a5a54;
  --accent-soft: #e3f3f1;
  --warn: #92400e;
  --warn-soft: #fdf3e4;
  --danger: #9a1c12;
  --danger-soft: #fdecea;
  --code-bg: #1e2430;
  --code-text: #e6e9ef;
  --code-kw: #7dd3c7;
  --code-num: #f5c26b;
  --code-com: #a3acbd;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #12161d;
    --surface: #181d26;
    --surface-2: #1f2530;
    --text: #e6e8ec;
    --muted: #b3bbc8;
    --border: #2c3442;
    --accent: #4fd1c0;
    --accent-soft: #15302e;
    --warn: #f0b456;
    --warn-soft: #2e2516;
    --danger: #f2877c;
    --danger-soft: #34201e;
    --code-bg: #0c1016;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--sans);
  font-size: 1.125rem;
  line-height: 1.7;
}
a { color: var(--accent); }

/* Accessibility helpers */
.skip-link {
  position: absolute;
  left: 16px;
  top: -100px;
  z-index: 10;
  background: var(--text);
  color: var(--bg);
  padding: 10px 16px;
  border-radius: 8px;
  font-weight: 600;
  text-decoration: none;
}
.skip-link:focus { top: 12px; }
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}
main:focus { outline: none; }
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}

/* Shared site header (filled in by header.js) */
html { scroll-padding-top: 88px; }
site-header {
  display: block;
  position: sticky;
  top: 0;
  z-index: 5;
  min-height: 68px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
site-header > a {
  display: inline-block;
  padding: 20px 24px;
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text);
  text-decoration: none;
}
.site-header-inner {
  max-width: 1040px;
  margin: 0 auto;
  padding: 0 24px;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--text);
  text-decoration: none;
}
.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: var(--accent);
  color: var(--bg);
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -.02em;
  box-shadow: 0 1px 0 rgba(0,0,0,.08), inset 0 -2px 0 rgba(0,0,0,.12);
}
.brand-name {
  font-family: var(--serif);
  font-weight: 700;
  font-size: 1.3125rem;
  letter-spacing: -.01em;
}
.brand-accent { color: var(--accent); }
.site-header nav ul { list-style: none; margin: 0; padding: 0; display: flex; gap: 6px; }
.site-header nav a {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 999px;
  color: var(--text);
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  transition: background-color .15s ease, color .15s ease;
}
.site-header nav a:hover { background: var(--surface-2); }
.site-header nav a[aria-current="page"] { background: var(--accent-soft); color: var(--accent); }

header.hero {
  max-width: 820px;
  margin: 0 auto;
  padding: 72px 24px 40px;
  text-align: center;
}
.kicker {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 22px;
}
h1 {
  font-family: var(--serif);
  font-size: clamp(2.125rem, 5.4vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -.01em;
  margin: 0 0 20px;
  text-wrap: balance;
}
.standfirst {
  font-size: clamp(1.1875rem, 2.2vw, 1.375rem);
  color: var(--muted);
  line-height: 1.55;
  margin: 0 auto 26px;
  max-width: 680px;
  text-wrap: pretty;
}
.meta {
  font-size: 0.875rem;
  color: var(--muted);
}
.meta .sep { margin: 0 10px; }

.article-body {
  max-width: 720px;
  margin: 0 auto;
  padding: 8px 24px 80px;
}
.article-body > p:first-of-type::first-letter {
  font-family: var(--serif);
  float: left;
  font-size: 3.6em;
  line-height: .9;
  padding: 6px 10px 0 0;
  color: var(--accent);
}
h2 {
  font-family: var(--serif);
  font-size: clamp(1.625rem, 3.4vw, 2rem);
  line-height: 1.25;
  margin: 64px 0 18px;
  text-wrap: balance;
}
h3 {
  font-size: 1.25rem;
  margin: 40px 0 10px;
}
p { margin: 0 0 1.25em; text-wrap: pretty; }
ul.plain { padding-left: 1.2em; margin: 0 0 1.4em; }
ul.plain li { margin-bottom: .4em; }
ul.plain li::marker { color: var(--accent); }
code {
  font-family: var(--mono);
  font-size: .86em;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
}

.pullquote {
  margin: 48px 0;
  padding: 8px 0 8px 28px;
  border-left: 4px solid var(--accent);
  font-family: var(--serif);
  font-size: clamp(1.375rem, 2.8vw, 1.6875rem);
  line-height: 1.4;
  font-style: italic;
}

.callout {
  border-radius: 12px;
  padding: 20px 24px;
  margin: 32px 0;
  font-size: 1.0625rem;
  border: 1px solid transparent;
}
.callout p:last-child { margin-bottom: 0; }
.callout .label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  margin-bottom: 6px;
}
.callout.warn { background: var(--warn-soft); border-color: color-mix(in srgb, var(--warn) 30%, transparent); }
.callout.warn .label { color: var(--warn); }
.callout.good { background: var(--accent-soft); border-color: color-mix(in srgb, var(--accent) 30%, transparent); }
.callout.good .label { color: var(--accent); }

/* Code comparison */
.code-compare {
  display: grid;
  grid-template-columns: 1fr 1.35fr;
  gap: 14px;
  margin: 32px -60px 10px;
}
.code-card {
  background: var(--code-bg);
  color: var(--code-text);
  border-radius: 12px;
  overflow: hidden;
}
.code-card .tab {
  font-family: var(--sans);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--code-com);
  padding: 10px 16px;
  border-bottom: 1px solid rgba(255,255,255,.08);
}
.code-card pre {
  margin: 0;
  padding: 16px;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.8125rem;
  line-height: 1.6;
}
.kw { color: var(--code-kw); }
.num { color: var(--code-num); }
.com { color: var(--code-com); font-style: italic; }
figure.code-figure { margin: 0; }
.caption {
  font-size: 0.9375rem;
  color: var(--muted);
  text-align: center;
  margin: 0 0 32px;
}

/* Diagram */
figure.diagram {
  margin: 36px -60px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px 20px 12px;
}
figure.diagram svg { width: 100%; height: auto; display: block; }
figure.diagram figcaption {
  font-size: 0.9375rem;
  color: var(--muted);
  text-align: center;
  margin-top: 10px;
}
.d-title { font: 700 13px var(--sans); letter-spacing: .1em; text-transform: uppercase; }
.d-bad { fill: var(--danger); }
.d-good { fill: var(--accent); }
.d-box { fill: var(--surface-2); stroke: var(--border); }
.d-box-bad { fill: var(--danger-soft); stroke: var(--danger); }
.d-box-good { fill: var(--accent-soft); stroke: var(--accent); }
.d-text { font: 600 13px var(--sans); fill: var(--text); }
.d-small { font: 12px var(--sans); fill: var(--muted); }
.d-line-bad { stroke: var(--danger); }
.d-line-good { stroke: var(--accent); }
.d-line-muted { stroke: var(--muted); }

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin: 32px -60px;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 22px 22px 20px;
  font-size: 1rem;
  line-height: 1.6;
}
.card .num-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 30px; height: 30px;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.875rem;
  margin-bottom: 10px;
}
.card h3 { margin: 0 0 6px; font-size: 1.125rem; }
.card p { margin: 0; color: var(--muted); }
.card.featured { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent) inset; }

/* Table */
.table-wrap { overflow-x: auto; margin: 32px -60px; }
table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.9688rem;
  line-height: 1.5;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
}
th, td { padding: 14px 16px; text-align: left; vertical-align: top; border-bottom: 1px solid var(--border); }
tr:last-child td { border-bottom: 0; }
thead th { background: var(--surface-2); font-size: 0.8125rem; letter-spacing: .08em; text-transform: uppercase; }
thead th.bad { color: var(--danger); }
thead th.good { color: var(--accent); }
tbody th { font-weight: 600; width: 26%; }
.mark { font-weight: 700; margin-right: 4px; }
td.bad .mark { color: var(--danger); }
td.good .mark { color: var(--accent); }
.split-table thead th.ai { color: var(--accent); }
.split-table tbody th { width: 20%; }
.split-table td { width: 40%; }
caption { text-align: left; font-weight: 600; padding: 0 0 10px; }

/* Takeaways */
.takeaways {
  margin: 48px 0 32px;
  padding: 28px 30px;
  border-radius: 16px;
  background: var(--text);
  color: var(--bg);
}
.takeaways h3 { margin: 0 0 14px; font-family: var(--serif); font-size: 1.5rem; }
.takeaways ol { margin: 0; padding-left: 1.3em; }
.takeaways li { margin-bottom: .6em; font-size: 1.0625rem; }
.takeaways li::marker { font-weight: 700; }
.takeaways strong { color: inherit; }


/* Homepage */
.home-intro { max-width: 760px; margin: 0 auto; padding: 0 24px 80px; }
.home-intro > h2 {
  font-family: var(--sans);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--muted);
  margin: 0 0 16px;
}
.post-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 20px; }
.post-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 28px 24px;
  transition: border-color .15s ease, transform .15s ease;
}
.post-card:hover { border-color: var(--accent); transform: translateY(-2px); }
.post-card:has(a:focus-visible) { outline: 3px solid var(--accent); outline-offset: 3px; }
.post-card a:focus-visible { outline: none; }
.post-card .kicker { margin-bottom: 14px; }
.post-card h3 {
  font-family: var(--serif);
  font-size: clamp(1.5rem, 3vw, 1.875rem);
  line-height: 1.2;
  margin: 0 0 12px;
  text-wrap: balance;
}
.post-card h3 a { color: var(--text); text-decoration: none; }
.post-card h3 a::after { content: ""; position: absolute; inset: 0; border-radius: 16px; }
.post-card p { color: var(--muted); margin: 0 0 16px; font-size: 1.0625rem; }
.post-card .meta { margin: 0; display: flex; flex-wrap: wrap; align-items: center; gap: 4px 0; }
.post-card .read-more { margin-left: auto; color: var(--accent); font-weight: 600; font-size: 0.9375rem; }

footer {
  border-top: 1px solid var(--border);
  padding: 28px 24px 40px;
  text-align: center;
  font-size: 0.875rem;
  color: var(--muted);
}

footer p { margin: 0 0 4px; }
footer .credit {
  margin-top: 10px;
  font-family: var(--serif);
  font-style: italic;
  font-size: 1.0625rem;
  color: var(--text);
}
footer .credit span { color: var(--accent); }

@media (max-width: 860px) {
  .code-compare, figure.diagram, .cards, .table-wrap { margin-left: 0; margin-right: 0; }
  .code-compare { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  body { font-size: 1.0625rem; }
  header.hero { padding-top: 48px; }
  .code-compare, .cards { grid-template-columns: 1fr; }
  figure.diagram { padding: 16px 10px 8px; overflow-x: auto; }
  figure.diagram svg { min-width: 640px; }
  figure.diagram figcaption { position: sticky; left: 0; }
  .takeaways { padding: 22px 20px; }
  th, td { padding: 12px; }
  /* Stack the "who does what" table on phones */
  .split-table, .split-table tbody, .split-table tr, .split-table th, .split-table td { display: block; width: auto !important; }
  .split-table thead { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }
  .split-table caption { display: block; padding: 16px 16px 6px; }
  .split-table tbody tr { border-top: 1px solid var(--border); padding: 6px 0; }
  .split-table tbody th { border: 0; padding-bottom: 4px; font-size: 1.0625rem; }
  .split-table td { border: 0; padding-top: 4px; }
  .split-table td::before { content: attr(data-label); display: block; font-size: .8125rem; font-weight: 700; letter-spacing: .06em; text-transform: uppercase; color: var(--muted); }
  .split-table td:first-of-type::before { color: var(--accent); }
}