/* =========================================================
   420 Research — site styles
   All colors/typography live in :root custom properties.
   Restyle the whole site by editing only this block.
   ========================================================= */

:root {
  --bg:            #f7f6f3;
  --bg-elev:       #ffffff;
  --bg-inverse:    #16171a;
  --ink:           #1a1c20;
  --ink-soft:      #4a4e57;
  --ink-faint:     #8a8f99;
  --rule:          #e4e2dc;
  --accent:        #2f6f4e;
  --accent-soft:   #e8f1ec;

  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-serif: "Source Serif Pro", Georgia, "Times New Roman", serif;

  --maxw: 1180px;
  --maxw-prose: 720px;
  --gutter: clamp(20px, 4vw, 48px);
  --radius: 6px;
  --radius-lg: 12px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font: inherit; cursor: pointer; }

/* ---------- helpers ---------- */
.container { max-width: var(--maxw); margin: 0 auto; padding-inline: var(--gutter); }
.prose { max-width: var(--maxw-prose); margin: 0 auto; padding-inline: var(--gutter); }
.eyebrow {
  font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-faint); font-weight: 600;
}
.muted { color: var(--ink-faint); }

.btn {
  display: inline-block; padding: 12px 22px; border-radius: var(--radius);
  font-weight: 600; font-size: 14px; letter-spacing: 0.02em;
  border: 1px solid var(--ink); color: var(--ink); background: transparent;
  transition: background .15s, color .15s;
}
.btn:hover { background: var(--ink); color: var(--bg-elev); text-decoration: none; }
.btn-primary { background: var(--ink); color: var(--bg-elev); }
.btn-primary:hover { background: var(--accent); border-color: var(--accent); color: #fff; }

/* ---------- site header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(247,246,243,0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}
.site-header .container {
  display: flex; align-items: center; justify-content: space-between;
  height: 68px;
}
.brand {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; letter-spacing: -0.01em; font-size: 18px;
  color: var(--ink);
}
.brand:hover { text-decoration: none; }
.brand-mark {
  width: 28px; height: 28px; border-radius: 6px;
  background: var(--ink); color: var(--bg-elev);
  display: grid; place-items: center; font-size: 12px; font-weight: 700;
}
.brand-logo {
  height: 36px; width: auto; display: block;
  max-width: 220px;
}
.footer-brand-logo {
  height: 40px; width: auto; display: block;
  max-width: 240px;
  /* If your logo is dark-on-transparent and disappears on the dark footer,
     uncomment the next line OR supply a white version of the wordmark.
     filter: brightness(0) invert(1); */
}
@media (max-width: 760px) {
  .brand-logo { height: 30px; max-width: 180px; }
}
.site-nav { display: flex; gap: 28px; align-items: center; }
.site-nav a {
  color: var(--ink-soft); font-size: 14px; font-weight: 500;
}
.site-nav a:hover { color: var(--ink); text-decoration: none; }
.site-nav .nav-cta {
  border: 1px solid var(--ink); color: var(--ink);
  padding: 8px 16px; border-radius: var(--radius);
}
.site-nav .nav-cta:hover { background: var(--ink); color: var(--bg-elev); }
.nav-toggle { display: none; background: none; border: 0; padding: 8px; font-size: 20px; }
@media (max-width: 760px) {
  .nav-toggle { display: block; }
  .site-nav {
    position: absolute; top: 68px; right: 0; left: 0;
    background: var(--bg-elev); border-bottom: 1px solid var(--rule);
    flex-direction: column; gap: 0; padding: 12px 0; display: none;
  }
  .site-nav.open { display: flex; }
  .site-nav a { padding: 12px var(--gutter); width: 100%; }
}

/* ---------- footer ---------- */
.site-footer {
  background: var(--bg-inverse); color: #c8cbd1; margin-top: 80px;
  padding: 64px 0 32px;
}
.site-footer a { color: #c8cbd1; }
.site-footer a:hover { color: #fff; }
.footer-quote {
  font-family: var(--font-serif); font-style: italic;
  font-size: clamp(20px, 2.4vw, 28px);
  color: #fff; max-width: 720px; margin: 0 auto 8px;
  text-align: center; line-height: 1.4;
}
.footer-quote-attr {
  text-align: center; color: var(--ink-faint); font-size: 13px;
  letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 56px;
}
.footer-grid {
  display: grid; gap: 32px;
  grid-template-columns: 1.5fr repeat(3, 1fr);
  margin-bottom: 48px;
}
@media (max-width: 760px) {
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}
.footer-brand-mark {
  display: flex; align-items: center; gap: 10px; color: #fff;
  font-weight: 700; font-size: 18px; margin-bottom: 12px;
}
.footer-brand p { color: #9aa0aa; font-size: 14px; max-width: 320px; }
.footer-col h4 {
  color: #fff; font-size: 12px; letter-spacing: 0.14em;
  text-transform: uppercase; margin: 0 0 14px;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 8px; }
.footer-col li a { font-size: 14px; }
.footer-disclosure {
  border-top: 1px solid #2a2c33; padding-top: 28px; margin-top: 16px;
  font-size: 12px; color: #9aa0aa; line-height: 1.6;
}
.footer-disclosure strong { color: #fff; display: block; margin-bottom: 8px; }
.footer-meta {
  display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px;
  font-size: 12px; color: #9aa0aa; margin-top: 24px;
}
.footer-meta nav { display: flex; gap: 18px; flex-wrap: wrap; }

/* ============== HOMEPAGE ============== */
.hero { padding: 96px 0 64px; }
.hero .eyebrow { margin-bottom: 18px; display: block; }
.hero h1 {
  font-family: var(--font-serif); font-weight: 600;
  font-size: clamp(36px, 6vw, 64px);
  line-height: 1.05; letter-spacing: -0.02em;
  margin: 0 0 24px; max-width: 14ch;
}
.hero p {
  font-size: 18px; color: var(--ink-soft); max-width: 56ch; margin: 0 0 32px;
}
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; }

.pillars {
  display: grid; gap: 32px;
  grid-template-columns: repeat(3, 1fr);
  padding: 56px 0; border-top: 1px solid var(--rule);
}
@media (max-width: 760px) { .pillars { grid-template-columns: 1fr; gap: 28px; } }
.pillar h3 { margin: 0 0 8px; font-size: 16px; font-weight: 600; }
.pillar p { margin: 0; color: var(--ink-soft); font-size: 15px; }

.section { padding: 80px 0; }
.section-head {
  display: flex; align-items: end; justify-content: space-between;
  margin-bottom: 32px; gap: 24px; flex-wrap: wrap;
}
.section-head h2 {
  font-family: var(--font-serif); font-weight: 600;
  font-size: clamp(28px, 4vw, 40px); margin: 8px 0 0; letter-spacing: -0.01em;
}
.section-head a { font-size: 14px; font-weight: 600; color: var(--ink); }
.section-head a::after { content: " →"; }

/* card grid */
.card-grid {
  display: grid; gap: 28px;
  grid-template-columns: repeat(3, 1fr);
}
@media (max-width: 980px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .card-grid { grid-template-columns: 1fr; } }

.card {
  background: var(--bg-elev); border-radius: var(--radius-lg);
  overflow: hidden; border: 1px solid var(--rule);
  display: flex; flex-direction: column;
  transition: transform .2s, box-shadow .2s;
}
.card:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(20,22,28,0.06); }
.card-image {
  aspect-ratio: 16 / 9; background: linear-gradient(135deg, var(--accent-soft), var(--rule));
  display: grid; place-items: center;
  font-family: var(--font-serif); font-size: 28px; font-weight: 600;
  color: var(--ink-faint); letter-spacing: -0.02em;
}
.card-body { padding: 22px; display: flex; flex-direction: column; gap: 10px; flex: 1; }
.card-cat {
  font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--accent); font-weight: 600;
}
.card-cat:hover { text-decoration: none; }
.card-meta { font-size: 13px; color: var(--ink-faint); }
.card h3 {
  font-family: var(--font-serif); margin: 0;
  font-size: 20px; line-height: 1.25; font-weight: 600; letter-spacing: -0.01em;
}
.card h3 a { color: var(--ink); }
.card h3 a:hover { color: var(--accent); text-decoration: none; }
.card p { margin: 0; font-size: 14px; color: var(--ink-soft); }

/* stats */
.stats {
  display: grid; gap: 32px;
  grid-template-columns: 1.2fr 1fr;
  padding: 80px 0; border-top: 1px solid var(--rule);
  align-items: center;
}
@media (max-width: 760px) { .stats { grid-template-columns: 1fr; } }
.stats h2 {
  font-family: var(--font-serif); font-weight: 600;
  font-size: clamp(28px, 4vw, 40px); margin: 8px 0 16px; letter-spacing: -0.01em;
}
.stats p { color: var(--ink-soft); margin: 0; }
.stat-grid {
  display: grid; gap: 28px; grid-template-columns: 1fr 1fr;
}
.stat-num {
  font-family: var(--font-serif); font-size: 48px; font-weight: 600;
  letter-spacing: -0.02em; line-height: 1; color: var(--ink);
}
.stat-label {
  font-size: 13px; letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--ink-faint); margin-top: 6px;
}

.about-strip {
  padding: 80px 0; border-top: 1px solid var(--rule);
  display: grid; gap: 32px; grid-template-columns: 1fr 1.2fr; align-items: start;
}
@media (max-width: 760px) { .about-strip { grid-template-columns: 1fr; } }
.about-strip h2 {
  font-family: var(--font-serif); font-weight: 600;
  font-size: clamp(28px, 4vw, 40px); margin: 8px 0 16px; letter-spacing: -0.01em;
}
.about-strip p { color: var(--ink-soft); }
.mini-stats {
  display: grid; grid-template-columns: 1fr 1fr; gap: 24px 32px;
  border-top: 1px solid var(--rule); padding-top: 32px; margin-top: 24px;
}
.mini-stat .num {
  font-family: var(--font-serif); font-weight: 600; font-size: 32px; letter-spacing: -0.02em;
}
.mini-stat .lbl { font-size: 13px; color: var(--ink-faint); }

.engine { padding: 80px 0; border-top: 1px solid var(--rule); }
.engine h2 {
  font-family: var(--font-serif); font-weight: 600;
  font-size: clamp(28px, 4vw, 40px); margin: 8px 0 0; letter-spacing: -0.01em;
}
.engine > p { color: var(--ink-soft); margin-top: 16px; max-width: 60ch; }
.engine-grid {
  display: grid; gap: 32px; grid-template-columns: repeat(3, 1fr);
  margin-top: 40px;
}
@media (max-width: 760px) { .engine-grid { grid-template-columns: 1fr; } }
.engine-step { border-top: 2px solid var(--ink); padding-top: 20px; }
.engine-step .step-num {
  font-family: var(--font-serif); font-size: 44px; font-weight: 600;
  line-height: 1; letter-spacing: -0.02em; color: var(--ink-faint); margin-bottom: 12px;
}
.engine-step h3 { margin: 0 0 8px; font-size: 18px; font-weight: 600; }
.engine-step p { margin: 0; color: var(--ink-soft); font-size: 15px; }

.capabilities { padding: 80px 0; border-top: 1px solid var(--rule); }
.capabilities h2 {
  font-family: var(--font-serif); font-weight: 600;
  font-size: clamp(28px, 4vw, 40px); margin: 8px 0 0; letter-spacing: -0.01em;
}
.cap-grid {
  display: grid; gap: 28px; grid-template-columns: repeat(3, 1fr); margin-top: 40px;
}
@media (max-width: 760px) { .cap-grid { grid-template-columns: 1fr; } }
.cap {
  background: var(--bg-elev); border: 1px solid var(--rule);
  border-radius: var(--radius-lg); padding: 28px;
}
.cap h3 { margin: 0 0 8px; font-size: 17px; font-weight: 600; }
.cap p { margin: 0 0 16px; color: var(--ink-soft); font-size: 15px; }
.cap a { font-size: 13px; font-weight: 600; }

.pullquote {
  padding: 96px 0; text-align: center; border-top: 1px solid var(--rule);
}
.pullquote blockquote {
  font-family: var(--font-serif); font-style: italic;
  font-size: clamp(24px, 3.2vw, 36px); line-height: 1.35;
  max-width: 720px; margin: 0 auto 16px; color: var(--ink);
}
.pullquote cite {
  display: block; font-style: normal; font-size: 12px;
  letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-faint);
}

/* ============== ARTICLE ============== */
.article-header {
  padding: 80px 0 40px; max-width: var(--maxw-prose);
  margin: 0 auto; padding-inline: var(--gutter);
}
.article-header .breadcrumbs {
  font-size: 13px; color: var(--ink-faint); margin-bottom: 24px;
}
.article-header h1 {
  font-family: var(--font-serif); font-weight: 600;
  font-size: clamp(32px, 5vw, 52px); line-height: 1.1;
  letter-spacing: -0.02em; margin: 0 0 24px;
}
.article-meta {
  display: flex; gap: 18px; flex-wrap: wrap; align-items: center;
  font-size: 14px; color: var(--ink-faint);
  padding-bottom: 24px; border-bottom: 1px solid var(--rule);
}
.article-meta .author { color: var(--ink); font-weight: 600; }
.article-meta .disclosure-link { color: var(--ink-soft); }

.toc {
  max-width: var(--maxw-prose); margin: 0 auto 48px;
  padding: 24px var(--gutter); background: var(--bg-elev);
  border: 1px solid var(--rule); border-radius: var(--radius-lg);
}
.toc-title {
  font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase;
  font-weight: 700; color: var(--ink); margin-bottom: 14px;
}
.toc ol { padding-left: 20px; margin: 0; }
.toc li { margin-bottom: 6px; font-size: 14px; }
.toc a { color: var(--ink); }

.article-body {
  max-width: var(--maxw-prose); margin: 0 auto;
  padding-inline: var(--gutter);
  font-family: var(--font-serif); font-size: 18px; line-height: 1.75;
  color: #25272d;
}
.article-body p { margin: 0 0 1.2em; }
.article-body h2 {
  font-family: var(--font-serif); font-weight: 600;
  font-size: 30px; letter-spacing: -0.01em;
  margin: 56px 0 18px; padding-top: 12px;
  scroll-margin-top: 90px;
}
.article-body h3 {
  font-family: var(--font-serif); font-weight: 600;
  font-size: 22px; margin: 36px 0 12px;
  scroll-margin-top: 90px;
}
.article-body ul, .article-body ol { padding-left: 22px; margin: 0 0 1.2em; }
.article-body li { margin-bottom: 6px; }
.article-body blockquote {
  border-left: 3px solid var(--accent); padding: 4px 0 4px 20px;
  margin: 24px 0; color: var(--ink-soft); font-style: italic;
}

.article-end {
  max-width: var(--maxw-prose); margin: 64px auto 0;
  padding: 32px var(--gutter); border-top: 1px solid var(--rule);
}
.article-end .eyebrow { display: block; margin-bottom: 6px; }
.article-end .next-up {
  display: grid; gap: 16px; grid-template-columns: 1fr 1fr; margin-top: 24px;
}
@media (max-width: 620px) { .article-end .next-up { grid-template-columns: 1fr; } }
.next-card {
  padding: 20px; background: var(--bg-elev); border: 1px solid var(--rule);
  border-radius: var(--radius-lg);
}
.next-card .lbl { font-size: 12px; color: var(--ink-faint); letter-spacing: 0.1em; text-transform: uppercase; }
.next-card a {
  display: block; font-family: var(--font-serif); font-size: 18px;
  color: var(--ink); margin-top: 6px;
}

/* ============== CATEGORY / TOPIC / POLICY ============== */
.archive-head {
  padding: 80px 0 32px; border-bottom: 1px solid var(--rule);
}
.archive-head .eyebrow { display: block; margin-bottom: 12px; }
.archive-head h1 {
  font-family: var(--font-serif); font-weight: 600;
  font-size: clamp(36px, 5vw, 52px); margin: 0 0 16px; letter-spacing: -0.02em;
}
.archive-head p { color: var(--ink-soft); font-size: 18px; max-width: 60ch; margin: 0; }
.archive-list { padding: 48px 0; }

.topic-hero {
  padding: 96px 0 32px;
  display: grid; grid-template-columns: 1.3fr 1fr; gap: 48px;
  align-items: end;
}
@media (max-width: 760px) { .topic-hero { grid-template-columns: 1fr; } }
.topic-hero .eyebrow { display: block; margin-bottom: 16px; }
.topic-hero h1 {
  font-family: var(--font-serif); font-weight: 600;
  font-size: clamp(36px, 5.5vw, 56px);
  line-height: 1.05; letter-spacing: -0.02em; margin: 0 0 20px;
}
.topic-hero p { color: var(--ink-soft); font-size: 18px; }
.topic-facts {
  background: var(--bg-elev); border: 1px solid var(--rule);
  border-radius: var(--radius-lg); padding: 24px;
}
.topic-facts h4 { margin: 0 0 12px; font-size: 13px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-faint); }
.topic-facts ul { list-style: none; padding: 0; margin: 0; }
.topic-facts li {
  padding: 10px 0; border-bottom: 1px solid var(--rule);
  display: flex; justify-content: space-between; font-size: 14px;
}
.topic-facts li:last-child { border-bottom: 0; }
.topic-facts .lbl { color: var(--ink-soft); }
.topic-facts .val { color: var(--ink); font-weight: 600; }

.policy {
  max-width: var(--maxw-prose); margin: 0 auto;
  paddin