:root {
  color-scheme: dark;
  --bg: #0d0d0d;
  --panel: #151412;
  --paper: #f4f1ec;
  --muted: #a49e97;
  --faint: #716b65;
  --line: #302d2a;
  --accent: #c68a45;
  --content: 1120px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--paper);
  background: var(--bg);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; }
img { display: block; max-width: 100%; }

.learn-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 76px;
  padding: 0 clamp(20px, 5vw, 72px);
  background: rgb(13 13 13 / 92%);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(16px);
}
.learn-brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
  text-decoration: none;
}
.learn-brand img { width: 30px; height: 30px; }
.learn-nav { display: flex; gap: 24px; align-items: center; }
.learn-nav a {
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}
.learn-nav a:hover, .learn-nav a:focus-visible { color: var(--paper); }

.learn-shell { width: min(calc(100% - 40px), var(--content)); margin: 0 auto; }
.learn-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(260px, .42fr);
  gap: clamp(44px, 8vw, 120px);
  align-items: end;
  padding: clamp(76px, 10vw, 150px) 0 clamp(56px, 8vw, 96px);
  border-bottom: 1px solid var(--line);
}
.learn-kicker {
  margin: 0;
  color: var(--accent);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.learn-hero h1 {
  max-width: 850px;
  margin: 20px 0 0;
  font-size: clamp(48px, 7vw, 92px);
  font-weight: 560;
  line-height: .95;
  letter-spacing: -.065em;
}
.learn-hero > p:last-child {
  margin: 0;
  color: var(--muted);
  font-size: clamp(17px, 1.5vw, 21px);
  line-height: 1.58;
}

.article-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-left: 1px solid var(--line);
  margin: 64px 0 110px;
}
.article-card {
  display: flex;
  min-height: 280px;
  flex-direction: column;
  padding: clamp(28px, 4vw, 48px);
  text-decoration: none;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  transition: background 160ms ease, color 160ms ease;
}
.article-card:hover, .article-card:focus-visible { background: var(--panel); }
.article-card small { color: var(--accent); font-weight: 800; letter-spacing: .12em; text-transform: uppercase; }
.article-card h2 { margin: 30px 0 16px; font-size: clamp(28px, 3vw, 40px); line-height: 1.02; letter-spacing: -.045em; }
.article-card p { margin: 0; color: var(--muted); font-size: 16px; line-height: 1.6; }
.article-card span { margin-top: auto; padding-top: 34px; color: var(--paper); font-weight: 700; }

.article-shell { width: min(calc(100% - 40px), 980px); margin: 0 auto; }
.article-head {
  padding: clamp(70px, 9vw, 130px) 0 58px;
  border-bottom: 1px solid var(--line);
}
.article-head h1 {
  max-width: 900px;
  margin: 22px 0 24px;
  font-size: clamp(46px, 7vw, 82px);
  font-weight: 560;
  line-height: .97;
  letter-spacing: -.06em;
}
.article-dek { max-width: 760px; margin: 0; color: var(--muted); font-size: clamp(18px, 2vw, 23px); line-height: 1.55; }
.article-meta { display: flex; flex-wrap: wrap; gap: 12px 22px; margin-top: 34px; color: var(--faint); font-size: 13px; }

.article-layout { display: grid; grid-template-columns: 190px minmax(0, 1fr); gap: 56px; padding: 60px 0 110px; }
.article-aside { position: sticky; top: 110px; align-self: start; color: var(--faint); font-size: 13px; line-height: 1.55; }
.article-aside strong { display: block; margin-bottom: 10px; color: var(--paper); }
.article-body { min-width: 0; }
.article-body h2 { margin: 58px 0 18px; font-size: clamp(30px, 4vw, 44px); line-height: 1.05; letter-spacing: -.045em; }
.article-body h2:first-child { margin-top: 0; }
.article-body h3 { margin: 38px 0 12px; font-size: 23px; letter-spacing: -.025em; }
.article-body p, .article-body li { color: #c6c0b9; font-size: 18px; line-height: 1.75; }
.article-body p { margin: 0 0 24px; }
.article-body ul, .article-body ol { margin: 0 0 28px; padding-left: 24px; }
.article-body li + li { margin-top: 10px; }
.article-body blockquote {
  margin: 40px 0;
  padding: 26px 30px;
  color: var(--paper);
  background: var(--panel);
  border-left: 3px solid var(--accent);
  font-size: 22px;
  line-height: 1.5;
}
.article-body .note {
  margin: 36px 0;
  padding: 24px;
  color: var(--muted);
  background: #12110f;
  border: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.6;
}
.article-body a { text-decoration-color: var(--accent); text-underline-offset: 4px; }
.article-body a:hover, .article-body a:focus-visible { color: #fff; }

.related { padding: 58px 0 90px; border-top: 1px solid var(--line); }
.related h2 { margin: 0 0 30px; font-size: 30px; letter-spacing: -.04em; }
.related-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 1px; background: var(--line); }
.related a { padding: 24px; background: var(--bg); text-decoration: none; }
.related a:hover, .related a:focus-visible { background: var(--panel); }
.related small { display: block; margin-bottom: 10px; color: var(--accent); font-weight: 800; text-transform: uppercase; letter-spacing: .1em; }
.related strong { font-size: 19px; line-height: 1.3; }

.learn-footer {
  display: flex;
  justify-content: space-between;
  gap: 30px;
  padding: 44px clamp(20px, 5vw, 72px);
  color: var(--faint);
  border-top: 1px solid var(--line);
  font-size: 13px;
}
.learn-footer div { display: flex; flex-wrap: wrap; gap: 18px; }
.learn-footer a:hover, .learn-footer a:focus-visible { color: var(--paper); }

@media (max-width: 760px) {
  .learn-header { min-height: 66px; }
  .learn-nav a:first-child { display: none; }
  .learn-hero { grid-template-columns: 1fr; padding-top: 64px; }
  .article-grid { grid-template-columns: 1fr; margin-top: 40px; }
  .article-card { min-height: 240px; }
  .article-layout { grid-template-columns: 1fr; gap: 28px; padding-top: 38px; }
  .article-aside { position: static; padding-bottom: 24px; border-bottom: 1px solid var(--line); }
  .related-grid { grid-template-columns: 1fr; }
  .learn-footer { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .article-card { transition: none; }
}