:root {
  --bg: #0F0B1E;
  --bg-elev: #161128;
  --bg-elev-2: #1F1834;
  --ink: #F2EDFF;
  --ink-dim: #B8B0CC;
  --ink-faint: #7B7390;
  --accent: #9B7CFF;
  --accent-soft: #6F58CC;
  --accent-glow: rgba(155, 124, 255, 0.18);
  --line: rgba(255, 255, 255, 0.08);
  --ok: #6BD49A;
  --err: #F08585;
  --maxw: 1080px;
  --maxw-prose: 720px;
  --radius: 14px;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
  --type-display: 56px;
  --type-h1: 40px;
  --type-h2: 28px;
  --type-h3: 20px;
  --type-body: 17px;
  --type-small: 14px;
}

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Inter, system-ui, sans-serif;
  font-size: var(--type-body);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

body { min-height: 100vh; }

a { color: var(--accent); text-decoration: none; }
a:hover, a:focus { color: #C4B0FF; text-decoration: underline; }

h1, h2, h3 { font-family: "Playfair Display", Georgia, serif; font-weight: 600; letter-spacing: -0.01em; line-height: 1.15; margin: 0 0 0.5em; }
h1 { font-size: var(--type-h1); }
h2 { font-size: var(--type-h2); }
h3 { font-size: var(--type-h3); font-family: -apple-system, BlinkMacSystemFont, system-ui, sans-serif; font-weight: 600; }

p { margin: 0 0 1em; color: var(--ink); }
p.lead { color: var(--ink-dim); font-size: 19px; max-width: 60ch; }
.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 12px;
  color: var(--accent);
  margin: 0 0 12px;
  font-weight: 600;
}
.fineprint { color: var(--ink-faint); font-size: var(--type-small); }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* Layout */
.site-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 22px 28px;
  max-width: var(--maxw);
  margin: 0 auto;
}
.brand { font-family: "Playfair Display", Georgia, serif; font-size: 22px; font-weight: 700; color: var(--ink); }
.brand:hover { text-decoration: none; color: var(--ink); }
.site-nav { display: flex; gap: 22px; }
.site-nav a { color: var(--ink-dim); font-size: 15px; }
.site-nav a:hover { color: var(--ink); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--ink); }

main { max-width: var(--maxw); margin: 0 auto; padding: 0 28px 80px; }
section { padding: 56px 0; border-top: 1px solid var(--line); }
section:first-of-type { border-top: 0; }

/* Hero */
.hero { padding: 72px 0 48px; }
.hero h1 {
  font-size: var(--type-display);
  max-width: 18ch;
  margin-bottom: 16px;
}
.hero.compact h1 { font-size: var(--type-h1); }
.cta-row { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 24px; }

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  height: 46px; padding: 0 22px;
  border-radius: 999px;
  font-weight: 600; font-size: 15px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.06s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn.primary {
  background: var(--accent);
  color: #0F0B1E;
}
.btn.primary:hover { background: #B49AFF; text-decoration: none; }
.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}
.btn.ghost:hover { border-color: var(--accent); color: var(--ink); text-decoration: none; }
.btn:active { transform: translateY(1px); }

/* Value props */
.value-props .props {
  list-style: none; padding: 0; margin: 28px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
}
.prop {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
}
.prop h3 { margin-bottom: 6px; }
.prop p { color: var(--ink-dim); margin: 0; font-size: 15px; }

/* Waitlist */
.waitlist { background: linear-gradient(180deg, transparent, var(--accent-glow)); border-radius: var(--radius); padding: 56px 28px; }
.waitlist-form { display: grid; gap: 14px; max-width: 420px; margin-top: 18px; }
.field { display: grid; gap: 6px; }
.field-label { font-size: 13px; color: var(--ink-dim); }
.field input,
.field select {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  color: var(--ink);
  border-radius: 10px;
  height: 44px;
  padding: 0 14px;
  font-size: 15px;
  font-family: inherit;
}
.field input:focus,
.field select:focus { outline: 2px solid var(--accent); border-color: var(--accent); }
.form-status { min-height: 1.4em; font-size: 14px; }
.form-status.ok { color: var(--ok); }
.form-status.error { color: var(--err); }
.form-status.pending { color: var(--ink-dim); }

/* FAQ */
.faq details {
  border-top: 1px solid var(--line);
  padding: 18px 0;
}
.faq details:last-of-type { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer;
  list-style: none;
  font-weight: 600;
  font-size: 17px;
  display: flex; justify-content: space-between; align-items: center; gap: 12px;
}
.faq summary::after {
  content: '+'; color: var(--accent); font-size: 22px; line-height: 1;
}
.faq details[open] summary::after { content: '–'; }
.faq summary::-webkit-details-marker { display: none; }
.faq .answer { padding-top: 10px; color: var(--ink-dim); }

/* Footer */
.site-footer {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 32px 28px 48px;
  border-top: 1px solid var(--line);
  color: var(--ink-dim);
  font-size: 14px;
}
.footer-links { list-style: none; padding: 0; margin: 12px 0; display: flex; gap: 18px; flex-wrap: wrap; }
.footer-links a { color: var(--ink-dim); }
.footer-links a:hover { color: var(--ink); }

/* Research index */
.cards { list-style: none; padding: 0; margin: 0; display: grid; gap: 16px; }
.card {
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 22px;
  transition: border-color 0.15s ease, transform 0.08s ease;
}
.card:hover { border-color: var(--accent); transform: translateY(-1px); }
.card a.card-link { color: var(--ink); }
.card a.card-link:hover { text-decoration: none; }
.card h3 { margin: 6px 0 8px; }
.card .card-summary { color: var(--ink-dim); margin: 0 0 10px; font-size: 15px; }
.card .card-meta { color: var(--ink-faint); font-size: 13px; }
.card .pill {
  display: inline-block;
  background: rgba(155, 124, 255, 0.12);
  color: var(--accent);
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* Research detail */
.research-article { max-width: var(--maxw-prose); }
.breadcrumb { margin: 16px 0 24px; color: var(--ink-faint); font-size: 13px; }
.breadcrumb a { color: var(--ink-dim); }
.breadcrumb a:hover { color: var(--ink); }
.answer-first {
  background: var(--bg-elev-2);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  padding: 18px 20px;
  margin: 18px 0 28px;
}
.answer-first p { margin: 0; color: var(--ink); }
.research-article h2 { margin-top: 36px; }
.summary-block p { color: var(--ink-dim); }
.source-block {
  margin-top: 48px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-elev);
}
.source-block p { margin: 0 0 8px; }
.back-link { margin-top: 32px; display: flex; gap: 14px; flex-wrap: wrap; }

.article-byline {
  color: var(--ink-dim);
  font-size: 14px;
  margin: 4px 0 18px;
}
.article-byline time { color: var(--ink); }

abbr[title] {
  text-decoration: underline dotted;
  text-underline-offset: 2px;
  cursor: help;
}

.fact-table {
  margin: 0 0 28px;
  padding: 14px 18px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}
.fact-table table { width: 100%; border-collapse: collapse; font-size: 14px; }
.fact-table th, .fact-table td { text-align: left; padding: 6px 0; vertical-align: top; }
.fact-table th { width: 35%; color: var(--ink-dim); font-weight: 500; padding-right: 16px; }
.fact-table td { color: var(--ink); }

.related-research { margin-top: 40px; }
.related-research h2 { margin-bottom: 14px; }
.related-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.related-list a {
  display: grid;
  gap: 4px;
  padding: 14px 16px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  text-decoration: none;
}
.related-list a:hover { border-color: var(--accent); }
.related-list .related-title { font-weight: 600; }
.related-list .related-meta { color: var(--ink-dim); font-size: 13px; }

.simple-page article { max-width: 720px; margin: 0 auto; padding: 24px 0 60px; }
.simple-page h1 { margin-bottom: 12px; }
.simple-page h2 { margin-top: 32px; }
.simple-page p { color: var(--ink-dim); }
.simple-page ul, .simple-page ol { color: var(--ink-dim); padding-left: 22px; }
.simple-page a { color: var(--accent); }

/* Mobile */
@media (max-width: 720px) {
  :root { --type-display: 36px; --type-h1: 28px; --type-h2: 22px; --type-h3: 18px; --type-body: 16px; }
  .site-header { padding: 16px 18px; }
  main { padding: 0 18px 60px; }
  section { padding: 44px 0; }
  .waitlist { padding: 40px 18px; }
}