/* ==========================================================================
   Modern Health Findings — "Preprint / Abstract Digest" design system
   Signature device: monospace citation-tag badges for study/doc metadata.
   ========================================================================== */

:root {
  --ink: #1A1A1A;
  --ink-soft: #3A3A3A;
  --paper: #FFFFFF;
  --coral: #D64545;
  --coral-dark: #B93A3A;
  --coral-wash: rgba(214, 69, 69, 0.06);
  --line: #1A1A1A;
  --line-soft: #E2E2E2;
  --gray-50: #FAFAFA;
  --gray-100: #F3F3F1;
  --gray-400: #B8B8B8;
  --gray-500: #767676;
  --gray-700: #4A4A4A;
  --font-sans: 'Work Sans', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'SF Mono', 'Consolas', monospace;
  --container: 1140px;
}

/* ---- Reset & base ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; }
h1, h2, h3 { font-family: var(--font-sans); margin: 0; }
p { margin: 0; }
button { font-family: var(--font-sans); }
[hidden] { display: none !important; }

/* ---- Utility bar & header ---- */
.utility-bar {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-align: center;
  padding: 9px 16px;
}

.site-header {
  border-bottom: 2px solid var(--ink);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 50;
}
.header-row {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  flex-wrap: wrap;
  gap: 12px;
}
.brand {
  display: flex;
  flex-direction: column;
  line-height: 1.1;
  text-decoration: none;
  color: var(--ink);
  font-weight: 700;
  font-size: 21px;
  letter-spacing: -0.01em;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--coral);
  margin-top: 5px;
}
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--ink);
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.05em;
  cursor: pointer;
  color: var(--ink);
}
.main-nav { display: flex; gap: 28px; }
.main-nav a {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}
.main-nav a:hover, .main-nav a:focus { border-bottom-color: var(--coral); }

/* ---- Citation tag (signature device) ---- */
.citation-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--coral);
  border: 1px solid var(--coral);
  background: var(--coral-wash);
  padding: 5px 11px;
}

/* ---- Hero ---- */
.hero {
  max-width: var(--container);
  margin: 0 auto;
  padding: 64px 24px 48px;
  border-bottom: 1px solid var(--line-soft);
}
.hero-eyebrow { margin-bottom: 22px; }
.hero-title {
  font-size: clamp(30px, 5vw, 50px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  max-width: 15ch;
  margin-bottom: 22px;
}
.hero-title .accent { color: var(--coral); }
.abstract-takeaway {
  font-size: 18px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--ink-soft);
  border-left: 3px solid var(--coral);
  padding-left: 18px;
  max-width: 640px;
  margin-bottom: 26px;
}
.hero-body { max-width: 640px; color: var(--gray-700); }
.hero-body p { font-size: 15.5px; line-height: 1.75; }
.hero-body p + p { margin-top: 14px; }

/* ---- Newsletter ---- */
.newsletter { background: var(--ink); color: var(--paper); padding: 44px 24px; }
.newsletter-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  align-items: center;
  justify-content: space-between;
}
.newsletter-copy h2 { font-size: 23px; font-weight: 700; margin-bottom: 8px; }
.newsletter-copy p { color: #CFCFCF; font-size: 14px; max-width: 420px; line-height: 1.6; }
.newsletter-form { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-start; }
.newsletter-input {
  padding: 13px 16px;
  border: 1px solid #444;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 14px;
  min-width: 240px;
}
.newsletter-button {
  padding: 13px 22px;
  background: var(--coral);
  color: var(--paper);
  border: none;
  font-weight: 700;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  cursor: pointer;
}
.newsletter-button:hover { background: var(--coral-dark); }
.newsletter-note {
  font-family: var(--font-mono);
  font-size: 11px;
  color: #9a9a9a;
  margin-top: 10px;
  width: 100%;
}
.honeypot-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* ---- Sections & grids ---- */
.section { max-width: var(--container); margin: 0 auto; padding: 56px 24px; }
.section--muted { background: var(--gray-50); }
.section--muted .section { padding: 56px 24px; }
.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 14px;
  margin-bottom: 32px;
}
.section-title { font-size: 22px; font-weight: 800; letter-spacing: -0.01em; }
.section-kicker {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gray-500);
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 32px;
}
.article-card { border-top: 2px solid var(--ink); padding-top: 18px; display: flex; flex-direction: column; }
.article-card-tag { margin-bottom: 12px; }
.article-card-title { font-size: 19px; font-weight: 700; line-height: 1.3; margin-bottom: 10px; }
.article-card-title a { color: var(--ink); text-decoration: none; }
.article-card-title a:hover { color: var(--coral); }
.article-card .abstract-takeaway { font-size: 14px; padding-left: 12px; margin-bottom: 12px; border-left-width: 2px; }
.article-card-excerpt { font-size: 14px; color: var(--gray-700); line-height: 1.65; }
.article-card-link {
  margin-top: auto;
  padding-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--coral);
  text-decoration: none;
}

.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 24px;
}
.product-card { border: 1px solid var(--line-soft); padding: 20px; background: var(--paper); }
.product-card-image {
  width: 100%;
  aspect-ratio: 1 / 1;
  background: var(--gray-100);
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
  font-family: var(--font-mono);
  font-size: 11px;
}
.product-card-title { font-size: 15px; font-weight: 700; margin-bottom: 8px; }
.product-card-note { font-size: 13px; color: var(--gray-700); line-height: 1.55; margin-bottom: 14px; }
.product-card-cta {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--paper);
  background: var(--ink);
  padding: 9px 14px;
  text-decoration: none;
}
.product-card-cta:hover { background: var(--coral); }

/* ---- Footer ---- */
.site-footer { border-top: 2px solid var(--ink); background: var(--paper); padding: 48px 24px 0; }
.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
  justify-content: space-between;
  padding-bottom: 32px;
}
.footer-brand { font-weight: 800; font-size: 18px; }
.footer-tagline { font-size: 12.5px; color: var(--gray-500); margin-top: 10px; max-width: 260px; line-height: 1.55; }
.footer-col h5 {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-500);
  margin-bottom: 12px;
  font-weight: 600;
}
.footer-col a { display: block; font-size: 14px; color: var(--ink); text-decoration: none; margin-bottom: 8px; }
.footer-col a:hover { color: var(--coral); }
.footer-legal {
  border-top: 1px solid var(--line-soft);
  padding: 18px 24px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.03em;
  color: var(--gray-500);
  text-transform: uppercase;
}
.footer-legal-inner { max-width: var(--container); margin: 0 auto; }

/* ---- Cookie banner ---- */
.cookie-banner {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 18px 24px;
  display: none;
  z-index: 100;
  border-top: 2px solid var(--coral);
}
.cookie-banner.show { display: block; }
.cookie-banner-inner {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
}
.cookie-banner p { font-size: 13px; max-width: 560px; line-height: 1.55; }
.cookie-banner a { color: var(--coral); }
.cookie-banner-actions { display: flex; gap: 10px; }
.btn {
  font-size: 13px;
  font-weight: 700;
  padding: 10px 18px;
  border: 1px solid var(--paper);
  background: transparent;
  color: var(--paper);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.03em;
}
.btn-primary { background: var(--coral); border-color: var(--coral); }
.btn-primary:hover { background: var(--coral-dark); border-color: var(--coral-dark); }
.btn-outline:hover { background: var(--paper); color: var(--ink); }

/* ---- Legal / doc pages ---- */
.breadcrumb {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--gray-500);
  max-width: var(--container);
  margin: 20px auto 0;
  padding: 0 24px;
}
.breadcrumb a { color: var(--gray-500); text-decoration: none; }
.breadcrumb a:hover { color: var(--coral); }

.doc { max-width: 760px; margin: 0 auto; padding: 40px 24px 80px; }
.doc-eyebrow { margin-bottom: 22px; }
.doc h1 { font-size: 32px; font-weight: 800; letter-spacing: -0.01em; margin-bottom: 20px; line-height: 1.2; }
.doc-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--gray-500);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 22px;
  margin-bottom: 32px;
}
.doc-meta b { color: var(--ink); font-weight: 700; }
.doc h2 { font-size: 19px; font-weight: 700; margin: 36px 0 12px; letter-spacing: -0.01em; }
.doc p { font-size: 15.5px; line-height: 1.75; color: var(--ink-soft); margin-bottom: 14px; }
.doc p b, .doc p strong { color: var(--ink); }
.doc a { color: var(--coral); }
.doc .mono {
  font-family: var(--font-mono);
  background: var(--gray-100);
  padding: 1px 6px;
  font-size: 13px;
}
.finding-box { border-left: 3px solid var(--coral); background: var(--gray-50); padding: 18px 22px; margin: 24px 0; }
.finding-box .flabel {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--coral);
  margin-bottom: 8px;
  font-weight: 700;
}
.finding-box p { margin-bottom: 8px; }
.finding-box p:last-child { margin-bottom: 0; }
.fine-print { font-size: 12.5px; color: var(--gray-500); border-top: 1px solid var(--line-soft); padding-top: 18px; margin-top: 32px; }
.refs { margin-top: 28px; padding-top: 18px; border-top: 1px solid var(--line-soft); }
.refs .flabel {
  font-family: var(--font-mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-500);
  margin-bottom: 8px;
}
.refs p { font-size: 13px; margin-bottom: 6px; }

/* ---- 404 ---- */
.error-page { max-width: 640px; margin: 0 auto; padding: 100px 24px 120px; text-align: center; }
.error-code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--coral);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 18px;
  display: inline-block;
}
.error-page h1 { font-size: 30px; font-weight: 800; margin-bottom: 16px; letter-spacing: -0.01em; }
.error-page p { font-size: 15px; color: var(--gray-700); margin-bottom: 28px; line-height: 1.6; }
.error-page .btn-home {
  display: inline-block;
  background: var(--ink);
  color: var(--paper);
  padding: 12px 24px;
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.error-page .btn-home:hover { background: var(--coral); }

/* ---- Responsive ---- */
@media (max-width: 760px) {
  .header-row { flex-wrap: wrap; }
  .nav-toggle { display: block; }
  .main-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0;
    order: 3;
    border-top: 1px solid var(--line-soft);
    margin-top: 12px;
    padding-top: 8px;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 10px 0; }
  .newsletter-inner { flex-direction: column; align-items: flex-start; }
  .newsletter-form { width: 100%; }
  .newsletter-input { flex: 1 1 auto; }
  .footer-inner { flex-direction: column; gap: 28px; }
}