/* Sourcebrook guides: the homepage's tokens and type, as a reading layout. */
:root {
  --navy: #0a1a2e; --navy-deep: #07131f; --on-navy: #eef3f8; --on-navy-2: #a9bdd1; --on-navy-3: #7d95ae;
  --paper: #f4f6f9; --white: #ffffff; --card: #ffffff;
  --ink: #0b1b2e; --ink-2: #34485d; --ink-3: #5c6f84;
  --line: #dde4ec; --line-2: #c5d0dc;
  --brand: #1f5a94; --signal: #e97b3e; --signal-text: #b4521c;
  --maxw: 1240px; --ease: cubic-bezier(.16, 1, .3, 1);
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --paper: #07111c; --white: #0a1624; --card: #0e1c2c;
    --ink: #e9eff6; --ink-2: #b4c3d2; --ink-3: #8599ae;
    --line: #1a2b3e; --line-2: #27394e;
    --brand: #7fb2e5; --signal-text: #f3a06c;
    color-scheme: dark;
  }
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink);
       font: 400 17px/1.65 Geist, system-ui, -apple-system, "Segoe UI", sans-serif; -webkit-font-smoothing: antialiased; }
img, svg { display: block; max-width: 100%; }
a { color: inherit; }
.mono { font-family: "Geist Mono", ui-monospace, SFMono-Regular, Consolas, monospace; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 40px; }
:focus-visible { outline: 2px solid var(--signal); outline-offset: 3px; border-radius: 4px; }

.btn { display: inline-flex; align-items: center; gap: 10px; height: 52px; padding: 0 26px; border-radius: 999px; border: 1px solid transparent;
       white-space: nowrap; text-decoration: none; font: 500 15.5px/1 Geist, system-ui, sans-serif; transition: background-color .35s var(--ease); }
.btn-signal { background: var(--signal); color: #0a1a2e; }
.btn-signal:hover { background: #f18c52; }
.btn-line { border-color: rgba(238, 243, 248, .28); color: var(--on-navy); }
.btn-line:hover { border-color: rgba(238, 243, 248, .75); }
.btn-sm { height: 40px; padding: 0 18px; font-size: 14px; }

.nav { position: sticky; top: 0; z-index: 50; border-bottom: 1px solid var(--line);
       background: color-mix(in srgb, var(--paper) 88%, transparent); -webkit-backdrop-filter: saturate(1.4) blur(14px); backdrop-filter: saturate(1.4) blur(14px); }
.nav .wrap { height: 68px; display: flex; align-items: center; justify-content: space-between; }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; font-weight: 600; font-size: 19px; letter-spacing: -.02em; }
.brand svg { width: 28px; height: 28px; }
.nav-links { display: flex; align-items: center; gap: 30px; }
.nav-links a:not(.btn) { text-decoration: none; font-size: 14.5px; opacity: .74; }
.nav-links a:not(.btn):hover, .nav-links a[aria-current] { opacity: 1; }

.article { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 9fr); gap: 0 56px; padding: 64px 0 128px; }
.toc { position: sticky; top: 100px; align-self: start; padding-top: 16px; border-top: 1px solid var(--line-2); font-size: 14px; }
.toc p { margin: 0 0 14px; font: 500 11.5px "Geist Mono", ui-monospace, monospace; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.toc a { text-decoration: none; color: var(--ink-2); }
.toc a:hover { color: var(--ink); }
.crumbs { margin: 0; font-size: 13.5px; color: var(--ink-3); }
.crumbs a { text-decoration: none; }
.crumbs a:hover { color: var(--ink); }
h1 { margin: 18px 0 0; font-weight: 500; font-size: clamp(38px, 5vw, 64px); line-height: 1.02; letter-spacing: -.042em; max-width: 16em; }
.dek { margin: 26px 0 0; max-width: 36em; font-size: 20px; line-height: 1.55; color: var(--ink-2); }
.byline { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-top: 28px; font-size: 14px; color: var(--ink-3); }
.byline b { font-weight: 500; color: var(--ink); }

.keybox { margin: 44px 0 0; padding: 26px 28px 28px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; }
.prose .keybox h2 { margin: 0 0 20px; scroll-margin-top: 0; font: 500 11.5px "Geist Mono", ui-monospace, monospace; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.keybox ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 36px; }
.keybox li { font-size: 15.5px; line-height: 1.5; color: var(--ink-2); }
.keybox li b { display: block; margin-bottom: 4px; font: 500 28px/1.1 "Geist Mono", ui-monospace, monospace; letter-spacing: -.02em; color: var(--ink); font-variant-numeric: tabular-nums; }

.prose h2 { margin: 76px 0 16px; font-weight: 500; font-size: clamp(26px, 2.6vw, 34px); line-height: 1.15; letter-spacing: -.03em; scroll-margin-top: 96px; }
.prose h3 { margin: 32px 0 8px; font-weight: 500; font-size: 20px; letter-spacing: -.02em; }
.prose p, .prose li { max-width: 40em; color: var(--ink-2); }
.prose ul, .prose ol { padding-left: 1.2em; }
.prose li + li { margin-top: 6px; }
.prose .keybox ul, .prose .related ul, .prose .hub { padding-left: 0; }
.prose .keybox li, .prose .related li, .prose .hub li { margin-top: 0; max-width: none; }
.prose .hub a, .prose .related a { color: inherit; }
.prose a { color: var(--brand); text-underline-offset: 3px; }
.prose .note { font-size: 14.5px; color: var(--ink-3); }

.terms { margin: 24px 0 0; border-top: 1px solid var(--line-2); }
.terms > div { display: grid; grid-template-columns: minmax(0, 3fr) minmax(0, 8fr); gap: 0 24px; padding: 20px 0; border-bottom: 1px solid var(--line); }
.terms dt { font-weight: 500; font-size: 18px; letter-spacing: -.015em; }
.terms dt small { display: block; margin-top: 4px; font: 500 12px "Geist Mono", ui-monospace, monospace; letter-spacing: .08em; color: var(--ink-3); }
.terms dd { margin: 0; color: var(--ink-2); }

.tscroll { overflow-x: auto; margin: 22px 0 8px; }
table.data { width: 100%; border-collapse: collapse; font-size: 15px; }
table.data caption { caption-side: bottom; padding-top: 12px; text-align: left; font-size: 13.5px; color: var(--ink-3); }
table.data th { padding: 10px 14px 10px 0; border-bottom: 1px solid var(--line-2); text-align: left; white-space: nowrap;
                font: 500 11px "Geist Mono", ui-monospace, monospace; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-3); }
table.data td { padding: 11px 14px 11px 0; border-bottom: 1px solid var(--line); vertical-align: top; color: var(--ink-2); }
table.data td:first-child { color: var(--ink); }
table.data .n { text-align: right; font-family: "Geist Mono", ui-monospace, monospace; font-variant-numeric: tabular-nums; white-space: nowrap; }
table.data tr.hot td.n.oai { color: var(--signal-text); }

figure.chart { margin: 26px 0 0; padding: 24px 24px 18px; background: var(--card); border: 1px solid var(--line); border-radius: 16px; }
figure.chart figcaption { margin: 0 0 14px; font-weight: 500; font-size: 16px; color: var(--ink); }
figure.chart figcaption span { display: block; margin-top: 2px; font-weight: 400; font-size: 13.5px; color: var(--ink-3); }
.bars .grid { stroke: var(--line); stroke-width: 1; }
.bars .axis { font: 500 11px "Geist Mono", ui-monospace, monospace; fill: var(--ink-3); }
.bars .bar { fill: var(--brand); }
.bars .bar.partial { fill-opacity: .45; }
.bars .lbl { font: 500 12px "Geist Mono", ui-monospace, monospace; fill: var(--ink); }
.bars .hit { fill: transparent; cursor: default; }
.bars g.col:hover .bar { fill-opacity: .8; }
.bars g.col:hover .bar.partial { fill-opacity: .3; }
.tip { position: absolute; pointer-events: none; padding: 8px 10px; border-radius: 8px; background: var(--ink); color: var(--paper);
       font: 500 12.5px/1.4 Geist, system-ui, sans-serif; white-space: nowrap; opacity: 0; transition: opacity .12s; }

.related { margin-top: 84px; padding-top: 20px; border-top: 1px solid var(--line-2); }
.related p { margin: 0 0 14px; font: 500 11.5px "Geist Mono", ui-monospace, monospace; letter-spacing: .14em; text-transform: uppercase; color: var(--ink-3); }
.related ul { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px 24px; }
.related a { display: block; padding: 18px 20px; border: 1px solid var(--line); border-radius: 14px; background: var(--card); text-decoration: none; }
.related a:hover { border-color: var(--line-2); }
.related a b { display: block; font-weight: 500; font-size: 17px; letter-spacing: -.015em; }
.related a span { display: block; margin-top: 4px; font-size: 14.5px; color: var(--ink-3); }

.hub { list-style: none; margin: 48px 0 0; padding: 0; border-top: 1px solid var(--line-2); }
.hub li { border-bottom: 1px solid var(--line); }
.hub a { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 8px 32px; padding: 30px 0; text-decoration: none; }
.hub b { font-weight: 500; font-size: 24px; line-height: 1.2; letter-spacing: -.025em; }
.hub span { color: var(--ink-2); }
.hub a:hover b { color: var(--brand); }

.cta { position: relative; overflow: hidden; padding: 96px 0; background: var(--navy); color: var(--on-navy); }
.cta::before { content: ""; position: absolute; inset: 0; background: radial-gradient(55% 80% at 88% 10%, rgba(31, 90, 148, .6), transparent 70%); }
.cta .wrap { position: relative; display: flex; flex-wrap: wrap; align-items: end; justify-content: space-between; gap: 32px; }
.cta h2 { margin: 0; max-width: 16em; font-weight: 500; font-size: clamp(32px, 4vw, 54px); line-height: 1.05; letter-spacing: -.04em; }
.cta p { margin: 18px 0 0; max-width: 30em; color: var(--on-navy-2); }
.cta .ctas { display: flex; flex-wrap: wrap; gap: 12px; }

footer { background: var(--navy-deep); color: var(--on-navy-2); padding: 56px 0 32px; font-size: 14.5px; }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 24px 48px; }
footer .brand { color: var(--on-navy); }
footer ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 10px 26px; }
footer a { text-decoration: none; }
footer a:hover { color: var(--on-navy); }
footer small { flex-basis: 100%; padding-top: 22px; border-top: 1px solid rgba(220, 235, 247, .08); font-size: 13px; color: var(--on-navy-3); }

@media (max-width: 1080px) {
  .wrap { padding: 0 32px; }
  .article { grid-template-columns: minmax(0, 1fr); padding-top: 48px; }
  .toc { display: none; }
}
@media (max-width: 720px) {
  body { font-size: 16px; }
  .wrap { padding: 0 20px; }
  .nav .wrap { height: 60px; }
  .nav-links a:not(.btn) { display: none; }
  .dek { font-size: 18px; }
  .keybox { padding: 22px 20px; }
  .keybox ul, .related ul { grid-template-columns: 1fr; }
  .terms > div, .hub a { grid-template-columns: 1fr; }
  .terms dt { margin-bottom: 6px; }
  figure.chart { padding: 18px 14px 12px; }
  .cta { padding: 72px 0; }
}