/* AIDC Investor - one stylesheet, no webfonts, no external requests.
   System fonts keep the site fast and avoid a third-party request that would
   otherwise need disclosing. Dark mode follows the reader's setting. */

:root {
  --bg: #ffffff;
  --fg: #16181d;
  --muted: #5a6069;
  --rule: #e3e6ea;
  --accent: #0b5cd5;
  --accent-soft: #eef4fe;
  --warn-bg: #fff8e6;
  --warn-rule: #e8c86a;
  --max: 46rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #e7e9ec;
    --muted: #9aa1ab;
    --rule: #2a2e35;
    --accent: #7fb0ff;
    --accent-soft: #1b2230;
    --warn-bg: #272013;
    --warn-rule: #6b5a2a;
  }
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 1.0625rem/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, sans-serif;
}

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 1.25rem; }

.skip {
  position: absolute; left: -9999px;
}
.skip:focus {
  left: 1rem; top: 1rem; background: var(--accent); color: #fff;
  padding: .5rem .75rem; border-radius: 4px; z-index: 10;
}

/* ---- header / footer ---- */

header.site {
  border-bottom: 1px solid var(--rule);
  margin-bottom: 2.5rem;
}
header.site .wrap {
  display: flex; flex-wrap: wrap; gap: .5rem 1.25rem;
  align-items: baseline; padding-top: 1rem; padding-bottom: 1rem;
}
.brand {
  font-size: 1.125rem; text-decoration: none; color: var(--fg);
  letter-spacing: -.01em; margin-right: auto;
}
.brand strong { color: var(--accent); }

header.site nav, footer.site nav {
  display: flex; flex-wrap: wrap; gap: .25rem 1rem;
  font-size: .9375rem;
}
header.site nav a, footer.site nav a {
  color: var(--muted); text-decoration: none;
}
header.site nav a:hover, footer.site nav a:hover { color: var(--accent); }
header.site nav a[aria-current="page"] { color: var(--fg); font-weight: 600; }

footer.site {
  margin-top: 4rem; border-top: 1px solid var(--rule);
  padding: 2rem 0 3rem; color: var(--muted); font-size: .9375rem;
}
footer.site p { margin: 0 0 .75rem; }
footer.site .disclaim { font-size: .875rem; }
footer.site nav { margin-top: 1rem; }

/* ---- article ---- */

article h1 {
  font-size: 2.125rem; line-height: 1.2; letter-spacing: -.02em;
  margin: 0 0 .75rem;
}
.standfirst {
  font-size: 1.1875rem; color: var(--muted); line-height: 1.55;
  margin: 0 0 2rem;
}

article h2 {
  font-size: 1.4375rem; line-height: 1.3; letter-spacing: -.01em;
  margin: 2.75rem 0 .75rem; padding-top: .25rem;
}
article h3 {
  font-size: 1.125rem; margin: 2rem 0 .5rem;
}
article h4 {
  font-size: 1rem; margin: 1.5rem 0 .5rem; color: var(--muted);
}

p, ul, ol { margin: 0 0 1.125rem; }
li { margin-bottom: .375rem; }
ul, ol { padding-left: 1.5rem; }

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

hr { border: 0; border-top: 1px solid var(--rule); margin: 2.5rem 0; }

blockquote {
  margin: 1.5rem 0; padding: .25rem 0 .25rem 1.125rem;
  border-left: 3px solid var(--rule); color: var(--muted);
}
blockquote p { margin: 0; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .9em; background: var(--accent-soft); padding: .1em .35em;
  border-radius: 3px;
}

/* ---- table of contents ---- */

.toc {
  background: var(--accent-soft); border-radius: 8px;
  padding: 1rem 1.25rem .25rem; margin: 0 0 2rem;
}
.toc h2 {
  font-size: .8125rem; text-transform: uppercase; letter-spacing: .06em;
  color: var(--muted); margin: 0 0 .5rem;
}
.toc ol { margin: 0 0 1rem; padding-left: 1.25rem; font-size: .9375rem; }
.toc li { margin-bottom: .25rem; }

/* ---- callouts ---- */

.callout {
  margin: 1.75rem 0; padding: 1rem 1.25rem; border-radius: 8px;
  background: var(--accent-soft); border: 1px solid var(--rule);
  font-size: .9375rem;
}
.callout > :last-child { margin-bottom: 0; }
.callout.warning { background: var(--warn-bg); border-color: var(--warn-rule); }
.callout h3, .callout h4 { margin-top: 0; }

/* ---- tables ---- */

.table-wrap { overflow-x: auto; margin: 1.75rem 0; }
table { border-collapse: collapse; width: 100%; font-size: .9375rem; }
th, td {
  text-align: left; padding: .5rem .75rem;
  border-bottom: 1px solid var(--rule); vertical-align: top;
}
th { font-weight: 600; white-space: nowrap; }

/* ---- Ark7 / sponsored links ---- */

a.ark7 { font-weight: 600; }

/* ---- page meta ---- */

footer.meta {
  margin-top: 3rem; padding-top: 1.25rem; border-top: 1px solid var(--rule);
  color: var(--muted); font-size: .875rem;
}
footer.meta p { margin: 0; }

@media (max-width: 34rem) {
  article h1 { font-size: 1.75rem; }
  .standfirst { font-size: 1.0625rem; }
  article h2 { font-size: 1.25rem; }
}