/* ========================================================
   Apogee Learn — educational article chrome
   Tokens, logo, footer, and buttons come from meridian.css.
   ======================================================== */

body{
  background: var(--bg);
  color: var(--ink-1);
  margin: 0;
}

.learn-nav{
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px clamp(20px, 5vw, 40px);
  background: rgba(247,248,246,.82);
  -webkit-backdrop-filter: blur(20px) saturate(160%);
  backdrop-filter: blur(20px) saturate(160%);
  border-bottom: 1px solid var(--line);
}
.learn-nav .logo-word{ color: var(--ink-1); }
.learn-nav-cta{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
  font-family: var(--f-mono);
  font-weight: 500;
  font-size: 12px;
  letter-spacing: .02em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 11px 18px;
  border-radius: 999px;
  background: var(--ink-1);
  color: #fff;
  border: 1px solid var(--ink-1);
  box-shadow: var(--shadow-btn);
  transition: background .3s ease, transform .15s ease;
}
.learn-nav-cta:hover{ background: #1a2236; transform: translateY(-1px); }

.learn{
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(48px, 8vw, 88px) clamp(20px, 5vw, 40px) 72px;
}
.learn-eyebrow{
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--c-blue);
  margin: 0 0 14px;
}
.learn-crumbs{
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 22px;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--ink-3);
}
.learn-crumbs a{
  color: var(--ink-2);
  text-decoration: none;
}
.learn-crumbs a:hover{ color: var(--c-blue); }
.learn-crumbs [aria-current="page"]{ color: var(--ink-1); }
.learn h1{
  font-family: var(--f-display);
  font-weight: 600;
  font-size: clamp(38px, 6vw, 56px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 18px;
  color: var(--ink-1);
  text-wrap: balance;
}
.learn-meta{
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: .02em;
  color: var(--ink-3);
  margin: 0;
  display: flex;
  gap: 18px;
  flex-wrap: wrap;
}
.learn-lede{
  font-size: 19px;
  line-height: 1.7;
  color: var(--ink-2);
  margin: 28px 0 0;
}
.learn-lede strong{ color: var(--ink-1); }

.learn-toc{
  margin: 36px 0 48px;
  padding: 22px 26px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-card);
}
.learn-toc h2{
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 14px;
}
.learn-toc ol{
  margin: 0;
  padding: 0;
  list-style: none;
  columns: 2;
  column-gap: 28px;
  counter-reset: toc;
}
.learn-toc li{
  margin: 0 0 10px;
  break-inside: avoid;
  counter-increment: toc;
}
.learn-toc a{
  font-family: var(--f-sans);
  font-size: 14px;
  color: var(--ink-2);
  text-decoration: none;
}
.learn-toc a::before{ content: counter(toc) ". "; color: var(--ink-3); }
.learn-toc a:hover{ color: var(--c-blue); }

.learn-body h2{
  font-family: var(--f-display);
  font-weight: 600;
  font-size: clamp(24px, 3.5vw, 32px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 56px 0 16px;
  color: var(--ink-1);
  scroll-margin-top: 92px;
}
.learn-body h3{
  font-family: var(--f-sans);
  font-weight: 600;
  font-size: 18px;
  margin: 32px 0 12px;
  color: var(--ink-1);
  scroll-margin-top: 92px;
}
.learn-body p,
.learn-body li{
  font-family: var(--f-sans);
  font-size: 16.5px;
  line-height: 1.75;
  color: var(--ink-2);
}
.learn-body p{ margin: 0 0 18px; }
.learn-body strong{ color: var(--ink-1); font-weight: 600; }
.learn-body a{
  color: #2563EB;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.learn-body a:hover{ color: var(--c-blue); }
.learn-body ul,
.learn-body ol{ margin: 0 0 20px; padding-left: 22px; }
.learn-body li{ margin: 0 0 10px; }
.learn-body hr{
  border: 0;
  border-top: 1px solid var(--line);
  margin: 48px 0;
}

.learn-callout{
  margin: 28px 0 32px;
  padding: 22px 24px 20px;
  background:
    radial-gradient(ellipse 80% 90% at 0% 0%, rgba(59,130,246,.12), transparent 58%),
    #fff;
  border: 1px solid rgba(16,40,90,.10);
  border-left: 4px solid #10285A;
  border-radius: var(--r-md);
  box-shadow: var(--shadow-card);
}
.learn-callout .learn-callout-label{
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: #10285A;
  margin: 0 0 10px;
}
.learn-callout p{ margin: 0 0 12px; color: var(--ink-1); }
.learn-callout p:last-child{ margin-bottom: 0; }
.learn-callout p.learn-formula{
  font-family: var(--f-display);
  font-size: clamp(22px, 3.2vw, 28px);
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: #10285A;
  margin: 10px 0 14px;
  font-variant-numeric: tabular-nums;
}

.learn-example{
  margin: 8px 0 28px;
  padding: 22px 24px;
  background: var(--bg-elev);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
}
.learn-example h3{ margin-top: 0; }
.learn-example dl{
  margin: 0;
  display: grid;
  gap: 10px;
}
.learn-example div{
  display: grid;
  grid-template-columns: minmax(9rem, 38%) 1fr;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px solid var(--line);
}
.learn-example div:last-child{ border-bottom: 0; padding-bottom: 0; }
.learn-example dt{
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0;
}
.learn-example dd{
  margin: 0;
  color: var(--ink-1);
  font-variant-numeric: tabular-nums;
  font-weight: 550;
}

.learn-figure{
  margin: 8px 0 32px;
  padding: 18px 16px 14px;
  background: #fff;
  border: 1px solid rgba(16,40,90,.10);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-card);
}
.learn-figure svg{
  display: block;
  width: 100%;
  height: auto;
}
.learn-figure figcaption{
  margin: 10px 6px 2px;
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-3);
}

.learn-table-wrap{
  margin: 0 0 28px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: #fff;
}
.learn-body table{
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
  font-family: var(--f-sans);
  font-size: 14.5px;
  font-variant-numeric: tabular-nums;
}
.learn-body caption{
  caption-side: bottom;
  text-align: left;
  padding: 10px 14px 12px;
  font-size: 13px;
  line-height: 1.45;
  color: var(--ink-3);
}
.learn-body th,
.learn-body td{
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  color: var(--ink-2);
  vertical-align: top;
  white-space: nowrap;
}
.learn-body th{
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--ink-1);
  background: #EEF3FF;
}
.learn-body tbody tr:last-child td{ border-bottom: 0; }
.learn-body tbody tr.is-highlight td{
  background: rgba(59,130,246,.08);
  color: var(--ink-1);
  font-weight: 600;
}

.learn-ctas{
  display: grid;
  gap: 14px;
  margin: 8px 0 36px;
}
.learn-cta{
  display: block;
  padding: 18px 20px;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  text-decoration: none !important;
  color: inherit;
  box-shadow: var(--shadow-card);
  transition: transform .15s ease, border-color .15s ease;
}
.learn-cta:hover{
  transform: translateY(-1px);
  border-color: rgba(59,130,246,.35);
}
.learn-cta span{
  display: block;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: #10285A;
  margin-bottom: 6px;
}
.learn-cta strong{
  display: block;
  font-family: var(--f-sans);
  font-size: 16px;
  color: var(--ink-1);
  margin-bottom: 4px;
  text-decoration: none;
}
.learn-cta p{
  margin: 0;
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--ink-2);
}

.learn-sources{
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: source;
}
.learn-sources li{
  position: relative;
  padding: 14px 0 14px 36px;
  border-bottom: 1px solid var(--line);
  counter-increment: source;
}
.learn-sources li:last-child{ border-bottom: 0; }
.learn-sources li::before{
  content: counter(source);
  position: absolute;
  left: 0;
  top: 16px;
  width: 22px;
  height: 22px;
  border-radius: 999px;
  background: #EEF3FF;
  color: #10285A;
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 500;
  display: grid;
  place-items: center;
}

.learn-body p.learn-disclaimer{
  margin: 40px 0 0;
  padding: 18px 20px;
  border-top: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--ink-3);
}
.learn-disclaimer strong{ color: var(--ink-2); }

@media (max-width: 640px){
  .learn-toc ol{ columns: 1; }
  .learn-nav .logo-word{ font-size: 17px; }
  .learn-example div{ grid-template-columns: 1fr; gap: 4px; }
  .learn-body table{ min-width: 0; }
  .learn-body thead{ display: none; }
  .learn-body caption{ padding: 0 14px 12px; }
  .learn-body tbody tr{
    display: block;
    padding: 12px 14px;
    border-bottom: 1px solid var(--line);
  }
  .learn-body tbody tr:last-child{ border-bottom: 0; }
  .learn-body tbody td{
    display: flex;
    justify-content: space-between;
    gap: 16px;
    padding: 6px 0;
    border: 0;
    white-space: normal;
  }
  .learn-body tbody td::before{
    content: attr(data-label);
    font-family: var(--f-mono);
    font-size: 10px;
    letter-spacing: .04em;
    text-transform: uppercase;
    color: var(--ink-3);
    flex: 0 0 46%;
  }
  .learn-body tbody tr.is-highlight{
    background: rgba(59,130,246,.08);
  }
  .learn-body tbody tr.is-highlight td{ background: transparent; }
}