/* ==========================================================================
   Modern Biology News — "Lab Notebook / Research Digest" design system
   Ink-navy + cyan-teal + amber-callout, grotesque sans + monospace data type.
   Reusable component classes for this site. Built as scaffold — no article
   or product content yet, but every class below is ready for that pass.
   ========================================================================== */

:root {
  --ink: #1C2A3A;        /* primary text / headers */
  --ink-soft: #4C5C6E;   /* secondary text */
  --teal: #1FA8A0;       /* accent / links */
  --teal-dark: #158079;  /* hover state */
  --white: #FFFFFF;
  --amber: #E8A33D;      /* KEY FINDING callout accent only — used sparingly */
  --amber-bg: #FDF3E3;
  --bg-alt: #F4F7F8;     /* section background, cool off-white */
  --border: #DFE6EA;
  --border-strong: #C4CFD6;
  --mono: 'SF Mono', 'Consolas', 'Courier New', monospace;
  --sans: 'Inter', 'Segoe UI', system-ui, sans-serif;
  --radius: 6px;
  --maxw: 1140px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--teal); text-decoration: none; }
a:hover { color: var(--teal-dark); text-decoration: underline; }
h1, h2, h3, h4 {
  font-family: var(--sans);
  color: var(--ink);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 16px;
}
h1 { font-size: clamp(28px, 4vw, 42px); }
h2 { font-size: clamp(22px, 3vw, 28px); }
h3 { font-size: 18px; }
p { margin: 0 0 16px; }
.mono { font-family: var(--mono); }
[hidden] { display: none !important; }

.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Top strip + header ---------- */
.top-strip {
  background: var(--ink);
  color: var(--white);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-align: center;
  padding: 7px 12px;
}

.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 40;
}
.nav-row {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.brand {
  display: flex;
  flex-direction: column;
  font-weight: 800;
  font-size: 21px;
  color: var(--ink);
  line-height: 1.1;
}
.brand:hover { text-decoration: none; color: var(--ink); }
.brand-tag {
  font-family: var(--mono);
  font-weight: 500;
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--teal);
  margin-top: 3px;
}
.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}
.site-nav a {
  color: var(--ink);
  font-weight: 600;
  font-size: 14px;
}
.site-nav a:hover { color: var(--teal); text-decoration: none; }

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--ink);
}

@media (max-width: 720px) {
  .nav-toggle { display: flex; }
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    align-items: flex-start;
    padding: 12px 20px 18px;
    gap: 14px;
  }
  .site-nav.is-open { display: flex; }
  .site-header { position: sticky; }
}

/* ---------- Hero (masthead) ---------- */
.hero {
  background: var(--ink);
  color: var(--white);
  padding: 64px 20px 56px;
}
.hero-inner {
  max-width: var(--maxw);
  margin: 0 auto;
}
.hero-badge {
  display: inline-block;
  margin-bottom: 18px;
}
.hero h1 {
  color: var(--white);
  max-width: 760px;
}
.hero-lede {
  color: #C7D2DB;
  font-size: 17px;
  max-width: 640px;
  margin-bottom: 26px;
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; }

/* ---------- Buttons ---------- */
.btn-primary, .btn-secondary, .btn-primary-sm, .btn-ghost {
  display: inline-block;
  font-family: var(--sans);
  font-weight: 700;
  font-size: 14px;
  padding: 12px 22px;
  border-radius: var(--radius);
  cursor: pointer;
  border: 1px solid transparent;
}
.btn-primary {
  background: var(--teal);
  color: var(--white);
}
.btn-primary:hover { background: var(--teal-dark); color: var(--white); text-decoration: none; }
.btn-secondary {
  background: transparent;
  color: var(--white);
  border: 1px solid rgba(255,255,255,0.4);
}
.btn-secondary:hover { border-color: var(--white); text-decoration: none; color: var(--white); }
.btn-primary-sm {
  background: var(--teal);
  color: var(--white);
  padding: 9px 18px;
  font-size: 13px;
}
.btn-primary-sm:hover { background: var(--teal-dark); }
.btn-ghost {
  background: transparent;
  color: var(--ink);
  border: 1px solid var(--border-strong);
  padding: 9px 18px;
  font-size: 13px;
}
.btn-ghost:hover { border-color: var(--ink); text-decoration: none; }

/* ---------- Stat badge (monospace data tag) ----------
   Signature device: small monospace tag used on hero, article-cards, and
   product-cards for a study-stat / year / issue-number style label.
   Example future usage inside an .article-card:
     <span class="stat-badge">2024</span> or <span class="stat-badge">n=240</span>
------------------------------------------------------------------------ */
.stat-badge {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 3px 9px;
  border-radius: 4px;
  background: rgba(31,168,160,0.14);
  color: var(--teal);
  border: 1px solid rgba(31,168,160,0.35);
}
.hero .stat-badge {
  background: rgba(255,255,255,0.1);
  color: var(--white);
  border-color: rgba(255,255,255,0.3);
}

/* ---------- Newsletter ---------- */
.newsletter-section {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  padding: 44px 20px;
}
.newsletter-inner {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}
.newsletter-inner h2 { margin-bottom: 8px; }
.newsletter-inner p { color: var(--ink-soft); margin-bottom: 22px; }
.newsletter-form {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  justify-content: center;
}
.newsletter-input {
  flex: 1 1 280px;
  max-width: 360px;
  padding: 12px 14px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  font-family: var(--sans);
  font-size: 14px;
}
.newsletter-input:focus { outline: 2px solid var(--teal); outline-offset: 1px; }
.newsletter-btn {
  background: var(--ink);
  color: var(--white);
  border: none;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 700;
  font-size: 14px;
  cursor: pointer;
}
.newsletter-btn:hover { background: var(--teal-dark); }
.newsletter-note { margin-top: 14px; font-size: 13px; color: var(--ink-soft); }
.newsletter-note.is-success { color: var(--teal-dark); font-weight: 600; }
.newsletter-note.is-error { color: #B23A3A; font-weight: 600; }
.hp-field { position: absolute; left: -9999px; opacity: 0; height: 0; width: 0; }

/* ---------- Content sections / grids ---------- */
.content-section {
  padding: 52px 20px;
  max-width: var(--maxw);
  margin: 0 auto;
}
.content-section--alt { background: var(--bg-alt); max-width: none; }
.content-section--alt > .section-head,
.content-section--alt > .article-grid,
.content-section--alt > .product-grid {
  max-width: var(--maxw);
  margin-left: auto;
  margin-right: auto;
}
.section-head { margin-bottom: 26px; display: flex; align-items: baseline; justify-content: space-between; flex-wrap: wrap; gap: 8px; }
.section-head h2 { margin-bottom: 4px; }
.section-sub { color: var(--ink-soft); font-size: 14px; margin: 0; }

.article-grid, .product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 22px;
}
.article-grid:empty::after, .product-grid:empty::after {
  content: "";
}

/* Article card (for the next content pass) — markup shape:
   <article class="article-card">
     <a href="/article/SLUG/" class="article-card-media"><img ...></a>
     <div class="article-card-body">
       <span class="stat-badge">2024</span>
       <h3><a href="/article/SLUG/">Title</a></h3>
       <p>One-line dek.</p>
     </div>
   </article> */
.article-card, .product-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--white);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.article-card:hover, .product-card:hover {
  border-color: var(--teal);
  transform: translateY(-2px);
}
.article-card-media, .product-card-media {
  aspect-ratio: 16/10;
  background: var(--bg-alt);
  overflow: hidden;
}
.article-card-media img, .product-card-media img { width: 100%; height: 100%; object-fit: cover; }
.article-card-body, .product-card-body { padding: 16px; }
.article-card-body h3, .product-card-body h3 { font-size: 16px; margin: 10px 0 6px; }
.article-card-body h3 a, .product-card-body h3 a { color: var(--ink); }
.article-card-body h3 a:hover, .product-card-body h3 a:hover { color: var(--teal); }
.article-card-body p, .product-card-body p { font-size: 13.5px; color: var(--ink-soft); margin: 0; }
.product-card-price { font-family: var(--mono); font-weight: 700; color: var(--ink); margin-top: 8px; display: block; }

/* ---------- Key Finding callout (amber, used sparingly) ----------
   Markup shape:
   <div class="key-finding">
     <span class="key-finding-label">Key Finding</span>
     <p>...</p>
   </div>
------------------------------------------------------------------------ */
.key-finding {
  background: var(--amber-bg);
  border: 1px solid var(--amber);
  border-left: 4px solid var(--amber);
  border-radius: var(--radius);
  padding: 18px 20px;
  margin: 24px 0;
}
.key-finding-label {
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #8A5A16;
  background: rgba(232,163,61,0.25);
  padding: 3px 9px;
  border-radius: 4px;
  margin-bottom: 10px;
}
.key-finding p:last-child { margin-bottom: 0; }

/* ---------- Legal / doc pages ---------- */
.doc-strip {
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--ink-soft);
  padding: 10px 20px;
}
.legal-page {
  max-width: 760px;
  margin: 0 auto;
  padding: 44px 20px 64px;
}
.page-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--teal);
  background: rgba(31,168,160,0.1);
  border: 1px solid rgba(31,168,160,0.3);
  padding: 4px 10px;
  border-radius: 4px;
  margin-bottom: 14px;
}
.page-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  font-size: 13px;
  color: var(--ink-soft);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
  margin: 4px 0 26px;
}
.page-meta b { color: var(--ink); font-family: var(--mono); font-weight: 600; }
.legal-page h2 { margin-top: 32px; font-size: 19px; }
.legal-page ul { padding-left: 20px; }
.legal-page li { margin-bottom: 8px; }
.fineprint { font-size: 13px; color: var(--ink-soft); }
.refs {
  border-top: 1px solid var(--border);
  margin-top: 34px;
  padding-top: 18px;
}
.refs-label {
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  margin-bottom: 8px;
  display: block;
}

/* ---------- 404 ---------- */
.error-page {
  max-width: 640px;
  margin: 0 auto;
  padding: 72px 20px;
  text-align: center;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  color: #B9C4CE;
  padding: 44px 20px 0;
}
.footer-top {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 30px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255,255,255,0.12);
}
@media (max-width: 640px) {
  .footer-top { grid-template-columns: 1fr; }
}
.footer-logo { color: var(--white); font-weight: 800; font-size: 18px; }
.footer-tagline { font-size: 13px; margin-top: 8px; max-width: 320px; }
.footer-col h5 {
  color: var(--white);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin: 0 0 12px;
}
.footer-col a {
  display: block;
  color: #B9C4CE;
  font-size: 14px;
  margin-bottom: 9px;
}
.footer-col a:hover { color: var(--teal); text-decoration: none; }
.footer-bottom {
  max-width: var(--maxw);
  margin: 0 auto;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.03em;
  color: #7E8C99;
  padding: 18px 0 22px;
}

/* ---------- Cookie banner ---------- */
.cookie-banner {
  position: fixed;
  left: 0; right: 0; bottom: 0;
  background: var(--ink);
  color: var(--white);
  padding: 16px 20px;
  z-index: 100;
  transform: translateY(110%);
  transition: transform 0.25s ease;
}
.cookie-banner.is-visible { transform: translateY(0); }
.cookie-banner-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.cookie-banner-inner p { margin: 0; font-size: 13px; max-width: 640px; color: #D7DEE4; }
.cookie-banner-inner a { color: var(--teal); }
.cookie-banner-actions { display: flex; gap: 10px; flex-shrink: 0; }

/* Fix: .btn-ghost defaults to dark ink text, invisible on the dark cookie-banner background */
.cookie-banner .btn-ghost {
  color: var(--white);
  border-color: rgba(255,255,255,0.45);
}
.cookie-banner .btn-ghost:hover {
  border-color: var(--white);
}