/* Aventience — shared stylesheet
   One file, hand-authored, no build step, no framework.
   Brand spec: 02-research/aventience-business/brand-assets/README-approved-mark-source.md
   Near black #191A1A, soft white #F7F8F6, Inter (variable) then Arial/Helvetica/sans-serif. */

@font-face {
  font-family: "Inter";
  src: url("/assets/fonts/Inter-Variable.woff2") format("woff2-variations"),
       url("/assets/fonts/Inter-Variable.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

:root {
  --ink: #191A1A;
  --paper: #F7F8F6;
  --paper-dim: #ECEEEA;
  --line: #D9DBD6;
  --link: #1F4FD8;
  --link-visited: #5B3FB8;
  --focus: #1F4FD8;
  --max-width: 46rem;
  --radius: 10px;
  font-size: 100%;
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: "Inter", Arial, Helvetica, sans-serif;
  font-weight: 400;
  line-height: 1.55;
  text-rendering: optimizeLegibility;
}

img { max-width: 100%; height: auto; display: block; }

a {
  color: var(--link);
  text-underline-offset: 0.15em;
}
a:visited { color: var(--link-visited); }
a:hover { text-decoration-thickness: 2px; }

/* Visible keyboard focus everywhere — never suppressed. */
a:focus-visible,
button:focus-visible,
.skip-link:focus {
  outline: 3px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 0.75em 1.25em;
  z-index: 100;
  border-radius: 0 0 8px 0;
}
.skip-link:focus {
  left: 0;
}

/* ---- Layout shell ---- */

.site-header {
  border-bottom: 1px solid var(--line);
  background: var(--paper);
}

.header-inner {
  max-width: 64rem;
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
}
.brand-logo {
  height: 34px;
  width: auto;
  display: block;
}

.primary-nav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.1rem;
  margin: 0;
  padding: 0;
}

.primary-nav a {
  display: inline-block;
  padding: 0.4rem 0.15rem;
  text-decoration: none;
  color: var(--ink);
  font-weight: 500;
  border-bottom: 2px solid transparent;
}
.primary-nav a:hover { border-bottom-color: var(--ink); }
.primary-nav a[aria-current="page"] {
  border-bottom-color: var(--ink);
  font-weight: 700;
}

.nav-toggle {
  display: none;
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2.5rem 1.25rem 4rem;
}

main.wide { max-width: 56rem; }

h1 { font-size: clamp(1.7rem, 4vw, 2.5rem); line-height: 1.15; margin: 0 0 0.75rem; }
h2 { font-size: 1.4rem; margin: 2.5rem 0 0.75rem; }
h3 { font-size: 1.1rem; margin: 1.75rem 0 0.5rem; }
p { margin: 0 0 1rem; }
ul, ol { margin: 0 0 1rem; padding-left: 1.4rem; }
li { margin-bottom: 0.4rem; }

.subhead {
  font-size: 1.15rem;
  color: #3a3b3a;
  margin-bottom: 1.5rem;
}

.section { margin-bottom: 2.5rem; }
.section:last-child { margin-bottom: 0; }

hr.divider {
  border: none;
  border-top: 1px solid var(--line);
  margin: 2.5rem 0;
}

blockquote {
  margin: 0 0 1rem;
  padding-left: 1rem;
  border-left: 3px solid var(--line);
  color: #2c2d2c;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  background: var(--paper-dim);
  padding: 0.1em 0.35em;
  border-radius: 4px;
  font-size: 0.92em;
}

table {
  border-collapse: collapse;
  width: 100%;
  margin: 0 0 1.5rem;
}
th, td {
  border: 1px solid var(--line);
  padding: 0.5rem 0.65rem;
  text-align: left;
  vertical-align: top;
}
th { background: var(--paper-dim); }

/* ---- CTAs ---- */

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  align-items: center;
  margin: 1.5rem 0 0.5rem;
}

.btn {
  display: inline-block;
  padding: 0.75em 1.4em;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 600;
  border: 2px solid var(--ink);
}

.btn-primary {
  background: var(--ink);
  color: var(--paper);
}
.btn-primary:visited { color: var(--paper); }
.btn-primary:hover { background: #000; }

.btn-secondary {
  background: transparent;
  color: var(--ink);
}
.btn-secondary:visited { color: var(--ink); }
.btn-secondary:hover { background: var(--paper-dim); }

.microcopy {
  font-size: 0.92rem;
  color: #4a4b4a;
  margin-top: 0.5rem;
}

.hero {
  padding-bottom: 1rem;
}

.draft-banner {
  background: #FFF4E5;
  border: 1px solid #E0B872;
  color: #4a3300;
  padding: 0.9rem 1.1rem;
  border-radius: var(--radius);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}

.doc-heading {
  margin-top: 0;
}

.effective-date {
  font-style: italic;
  color: #4a4b4a;
  margin-bottom: 1.5rem;
}

/* ---- Brief (partner one-page brief) ---- */

.brief {
  background: var(--paper-dim);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.5rem 1.75rem;
  margin-top: 1rem;
}
.brief h2, .brief h3 { margin-top: 1.5rem; }
.brief h2:first-child, .brief h3:first-child { margin-top: 0; }

/* ---- Footer ---- */

.site-footer {
  border-top: 1px solid var(--line);
  background: var(--paper-dim);
  margin-top: 3rem;
}

.footer-inner {
  max-width: 64rem;
  margin: 0 auto;
  padding: 2rem 1.25rem;
}

.footer-tagline {
  font-weight: 600;
  margin-bottom: 0.85rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.1rem;
  margin: 0 0 1rem;
  padding: 0;
}

.footer-links a { text-decoration: none; }
.footer-links a:hover { text-decoration: underline; }

.footer-copyright {
  font-size: 0.88rem;
  color: #4a4b4a;
  margin: 0;
}

/* ---- 404 page ---- */

.not-found {
  text-align: left;
}

/* ---- Responsive ---- */

@media (max-width: 640px) {
  .header-inner {
    flex-wrap: wrap;
  }
  .primary-nav ul {
    gap: 0.15rem 0.85rem;
    font-size: 0.95rem;
  }
  main { padding: 1.75rem 1.1rem 3rem; }
  .brief { padding: 1.25rem 1.25rem; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
}