/* Shared layout for learn/glossary/markets/audiences/calculators/sponsors pages.
   Extracted from the per-template inline <style> (audit: ~7KB duplicated on ~700 pages).
   Cached immutably via netlify.toml /css/* rules; ?v= fingerprint appended at build. */
* { margin: 0; padding: 0; box-sizing: border-box; }

  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    color: var(--ink);
    background: #fff;
    -webkit-font-smoothing: antialiased;
  }

  a { text-decoration: none; color: var(--navy); }

  .container { max-width: 78rem; margin: 0 auto; padding: 0 2rem; }

  /* ---------- Header (logged-in, sticky — same as offering page) ---------- */
  .main-header {
    background: #fff;
    border-bottom: 1px solid var(--hairline);
    position: sticky;
    top: 0;
    z-index: 60;
  }
  .main-header-inner {
    max-width: 78rem;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    min-height: 72px;
    gap: 2rem;
  }
  .logo img { height: 36px; width: auto; display: block; }
  .account-box { display: flex; align-items: center; gap: 1.25rem; }
  .welcome { font-size: 0.9rem; font-weight: 600; }
  .logout {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--ink-soft);
    border: 1px solid #cfd4dd;
    border-radius: 6px;
    padding: 0.45rem 0.9rem;
  }
  .logout:hover { color: var(--navy); border-color: var(--navy); }

  .nav-sep { width: 1px; height: 1.1rem; background: var(--hairline); }
  .nav-toggle { display: none; background: none; border: none; cursor: pointer; color: var(--ink); padding: 0.4rem; }
  @media (max-width: 720px) {
    .main-header-inner { position: relative; }
    .nav-toggle { display: inline-flex; }
    .account-box { display: none; position: absolute; top: 100%; right: 1rem; background: #fff;
      border: 1px solid var(--hairline); border-radius: 8px; padding: 1rem 1.25rem;
      flex-direction: column; align-items: flex-start; gap: 0.9rem;
      box-shadow: 0 12px 32px rgba(9, 14, 26, 0.12); z-index: 90; }
    .account-box.open { display: flex; }
    .nav-sep { width: 100%; height: 1px; }
  }

  /* ---------- Breadcrumbs + title ---------- */
  .breadcrumbs {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.82rem;
    color: var(--muted);
    margin: 1.5rem 0 1rem;
  }
  .breadcrumbs a { color: var(--muted); }
  .breadcrumbs a:hover { color: var(--navy); text-decoration: underline; }
  .breadcrumbs .sep { color: #c3c7cd; }
  .breadcrumbs .current { color: var(--ink); font-weight: 600; }

  .page-head { margin-bottom: 1.75rem; }
  .page-head h1 {
    font-size: clamp(1.6rem, 3vw, 2.3rem);
    font-weight: 700;
    letter-spacing: -0.01em;
    margin-bottom: 0.5rem;
  }
  .page-head p { font-size: 0.98rem; line-height: 1.6; color: var(--ink-soft); max-width: 52rem; }

  /* ---------- Footer (same as offering page / homepage) ---------- */
  .site-footer {
    background: #fff;
    border-top: 1px solid var(--hairline);
    color: var(--ink-soft);
    margin-top: 4.5rem;
  }
  .footer-inner { max-width: 78rem; margin: 0 auto; padding: 3.5rem 2rem 2rem; }
  .footer-cols {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 3rem;
    padding-bottom: 2.5rem;
    border-bottom: 1px solid var(--hairline);
  }
  @media (max-width: 880px) { .footer-cols { grid-template-columns: 1fr; gap: 2rem; } }
  .footer-brand img { height: 34px; width: auto; display: block; margin-bottom: 1rem; }
  .footer-brand p { font-size: 0.88rem; line-height: 1.6; color: var(--ink-soft); max-width: 26rem; }
  .site-footer h5 {
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #9aa0ab;
    margin-bottom: 0.9rem;
  }
  .footer-contact li, .footer-links li {
    list-style: none;
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 0.55rem;
    color: var(--ink-soft);
  }
  .site-footer a { color: var(--ink); }
  .site-footer a:hover { color: var(--navy); text-decoration: underline; }
  .footer-disclosure { padding: 2rem 0 1.5rem; border-bottom: 1px solid var(--hairline); }
  .footer-disclosure p { font-size: 0.74rem; line-height: 1.6; color: #8a8f99; margin-bottom: 0.75rem; }
  .footer-bottom {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.5rem 2rem;
    padding-top: 1.25rem;
    font-size: 0.78rem;
    color: #8a8f99;
  }
  .footer-bottom a { color: #8a8f99; }
  .site-footer { overflow: hidden; }
  .footer-love .love-heart { height: 0.82em; width: auto; vertical-align: -0.06em; }
  .footer-love {
    font-size: 9.3vw;
    font-weight: 800;
    letter-spacing: -0.02em;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    color: var(--navy);
    opacity: 0.06;
    margin-top: 2.5rem;
    margin-bottom: -0.18em;
    user-select: none;
    pointer-events: none;
  }


  .learn-layout { display: grid; grid-template-columns: 17rem 1fr; gap: 2.5rem; align-items: start; padding: 1.5rem 0 3rem; }
  @media (max-width: 900px) { .learn-layout { grid-template-columns: 1fr; } }
  .learn-nav { position: sticky; top: 96px; background: #fff; border: 1px solid var(--hairline); border-radius: 10px; padding: 0.8rem; max-height: calc(100vh - 130px); overflow-y: auto; }
  .learn-nav details { border-bottom: 1px solid var(--hairline); }
  .learn-nav details:last-child { border-bottom: none; }
  .learn-nav summary { list-style: none; cursor: pointer; display: flex; align-items: center; justify-content: space-between; font-size: 0.86rem; font-weight: 700; color: var(--ink); padding: 0.7rem 0.6rem; }
  .learn-nav summary::-webkit-details-marker { display: none; }
  .learn-nav summary::after { content: "\203A"; color: #9aa0ab; transition: transform 0.15s; font-size: 1rem; }
  .learn-nav details[open] summary::after { transform: rotate(90deg); }
  .learn-nav ul { list-style: none; padding: 0 0.6rem 0.7rem 0.9rem; }
  .learn-nav li { margin-bottom: 0.15rem; }
  .learn-nav li a { display: block; font-size: 0.83rem; color: var(--ink-soft); padding: 0.32rem 0.5rem; border-radius: 6px; }
  .learn-nav li a:hover { background: #f3f5f8; color: var(--navy); }
  .learn-nav li a.active { background: #edf1f7; color: var(--navy); font-weight: 600; }
  .learn-article { background: #fff; border: 1px solid var(--hairline); border-radius: 10px; padding: 2.4rem 2.8rem 2.8rem; max-width: 50rem; }
  .learn-article .kicker { font-size: 0.72rem; font-weight: 700; letter-spacing: 0.08em; text-transform: uppercase; color: var(--navy); }
  .learn-article h1 { font-size: clamp(1.5rem, 2.6vw, 2rem); font-weight: 800; letter-spacing: -0.01em; margin: 0.4rem 0 0.6rem; }
  .learn-article .meta { font-size: 0.78rem; color: var(--muted); margin-bottom: 1.6rem; }
  .learn-article h2 { font-size: 1.15rem; font-weight: 700; margin: 1.8rem 0 0.6rem; }
  .learn-article p, .learn-article li { font-size: 0.95rem; line-height: 1.75; color: var(--ink-soft); margin-bottom: 0.9rem; }
  .learn-article ul, .learn-article ol { padding-left: 1.3rem; margin-bottom: 0.9rem; }
  .learn-article .callout { background: #f4f7fb; border-left: 3px solid var(--navy); border-radius: 6px; padding: 0.9rem 1.1rem; font-size: 0.88rem; margin: 1.2rem 0; }
  .article-footer-nav { display: flex; justify-content: space-between; gap: 1rem; margin-top: 2.4rem; padding-top: 1.4rem; border-top: 1px solid var(--hairline); font-size: 0.86rem; font-weight: 600; }