:root {
  --ink: #0b1f35;
  --muted: #60707e;
  --paper: #f7f3eb;
  --paper-deep: #ede8de;
  --ivory: #fffdf8;
  --line: #d5cec1;
  --red: #b64b2a;
  --jade: #467665;
  --serif: Georgia, "Times New Roman", serif;
  --sans: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); }
a { color: inherit; text-decoration: none; }
.learn-header { position: sticky; top: 0; z-index: 30; display: grid; min-height: 74px; grid-template-columns: 1fr auto 1fr; align-items: center; padding: 0 clamp(20px,5vw,78px); border-bottom: 1px solid rgba(11,31,53,.12); background: rgba(247,243,235,.96); backdrop-filter: blur(14px); }
.learn-brand { display: flex; align-items: center; gap: 12px; width: max-content; }
.learn-seal { display: grid; width: 36px; height: 36px; place-items: center; border: 1px solid #c88568; color: var(--red); font-family: var(--serif); font-size: 21px; }
.learn-brand strong { display: block; font-family: var(--serif); font-size: 18px; font-weight: 400; }
.learn-brand small { display: block; margin-top: 2px; color: var(--muted); font-size: 9px; text-transform: uppercase; }
.learn-nav { display: flex; gap: 28px; color: #435363; font-size: 12px; }
.learn-actions { display: flex; justify-content: flex-end; }
.learn-button, .learn-button-line { display: inline-flex; min-height: 42px; align-items: center; justify-content: center; padding: 0 22px; border: 1px solid var(--ink); font-size: 11px; font-weight: 700; }
.learn-button { background: var(--ink); color: var(--ivory); }
.learn-button-line { background: transparent; color: var(--ink); }
.breadcrumb { max-width: 1140px; margin: 0 auto; padding: 34px 24px 0; color: var(--muted); font-size: 11px; }
.breadcrumb a { text-decoration: underline; text-underline-offset: 3px; }
.article-hero { display: grid; max-width: 1140px; grid-template-columns: 1.2fr .8fr; gap: clamp(44px,8vw,120px); align-items: end; margin: 0 auto; padding: 72px 24px 76px; }
.kicker { margin: 0 0 19px; color: var(--red); font-size: 10px; font-weight: 800; letter-spacing: 0; text-transform: uppercase; }
.article-hero h1 { margin: 0; font-family: var(--serif); font-size: clamp(52px,7.5vw,104px); font-weight: 400; line-height: .96; }
.article-hero .lead { max-width: 690px; margin: 30px 0 0; color: var(--muted); font-family: var(--serif); font-size: clamp(20px,2.3vw,30px); line-height: 1.45; }
.hero-aside { padding: 28px; border-top: 3px solid var(--red); background: var(--ivory); }
.hero-aside strong { display: block; font-family: var(--serif); font-size: 23px; font-weight: 400; }
.hero-aside p { margin: 12px 0 22px; color: var(--muted); font-size: 13px; line-height: 1.65; }
.keyword-strip { display: flex; max-width: 1140px; flex-wrap: wrap; gap: 8px; margin: 0 auto 64px; padding: 0 24px; }
.keyword-strip span { padding: 8px 12px; border: 1px solid var(--line); color: var(--muted); font-size: 10px; }
.article-shell { display: grid; max-width: 1140px; grid-template-columns: minmax(0,720px) minmax(240px,1fr); gap: clamp(50px,8vw,110px); margin: 0 auto; padding: 0 24px 100px; }
.article-body { min-width: 0; }
.article-body section { padding: 48px 0; border-top: 1px solid var(--line); }
.article-body section:first-child { border-top: 0; padding-top: 0; }
.article-body h2 { margin: 0 0 22px; font-family: var(--serif); font-size: clamp(32px,4vw,52px); font-weight: 400; line-height: 1.08; }
.article-body h3 { margin: 32px 0 12px; font-family: var(--serif); font-size: 24px; font-weight: 400; }
.article-body p, .article-body li { color: #41515f; font-size: 15px; line-height: 1.85; }
.article-body ul, .article-body ol { padding-left: 22px; }
.answer-box { padding: 26px 28px; border-left: 3px solid var(--jade); background: var(--ivory); }
.answer-box strong { display: block; margin-bottom: 8px; color: var(--jade); font-size: 11px; text-transform: uppercase; }
.answer-box p { margin: 0; color: var(--ink); font-family: var(--serif); font-size: 21px; line-height: 1.5; }
.palace-table { width: 100%; border-collapse: collapse; margin-top: 26px; background: var(--ivory); }
.palace-table th, .palace-table td { padding: 16px; border-bottom: 1px solid var(--line); text-align: left; vertical-align: top; }
.palace-table th { color: var(--muted); font-size: 10px; text-transform: uppercase; }
.palace-table td:first-child { color: var(--red); font-family: var(--serif); font-size: 19px; white-space: nowrap; }
.article-aside { align-self: start; }
.sticky-card { position: sticky; top: 102px; padding: 28px; border: 1px solid var(--line); background: var(--paper-deep); }
.sticky-card + .sticky-card { margin-top: 18px; }
.sticky-card h2 { margin: 0; font-family: var(--serif); font-size: 27px; font-weight: 400; }
.sticky-card p { color: var(--muted); font-size: 12px; line-height: 1.65; }
.sticky-card a { display: block; margin-top: 12px; color: var(--red); font-size: 12px; font-weight: 700; }
.topic-list { display: grid; gap: 0; margin-top: 20px; border-top: 1px solid var(--line); }
.topic-list a { margin: 0; padding: 13px 0; border-bottom: 1px solid var(--line); color: var(--ink); font-weight: 500; }
.cta-band { display: grid; grid-template-columns: 1fr auto; gap: 36px; align-items: center; padding: 56px clamp(24px,7vw,110px); background: var(--ink); color: var(--ivory); }
.cta-band h2 { margin: 0; font-family: var(--serif); font-size: clamp(35px,5vw,66px); font-weight: 400; }
.cta-band p { max-width: 760px; color: #bcc6cf; line-height: 1.7; }
.cta-band .learn-button { border-color: var(--ivory); background: var(--ivory); color: var(--ink); }
.learn-index-hero { max-width: 1140px; margin: 0 auto; padding: 92px 24px 68px; }
.learn-index-hero h1 { max-width: 920px; margin: 0; font-family: var(--serif); font-size: clamp(55px,8vw,112px); font-weight: 400; line-height: .94; }
.learn-index-hero > p:not(.kicker) { max-width: 700px; margin: 30px 0 0; color: var(--muted); font-size: 18px; line-height: 1.7; }
.library { display: grid; max-width: 1140px; grid-template-columns: repeat(3,minmax(0,1fr)); margin: 0 auto 100px; padding: 0 24px; }
.library a { display: flex; min-height: 270px; flex-direction: column; padding: 30px; border: 1px solid var(--line); border-right: 0; border-bottom: 0; background: rgba(255,255,255,.25); }
.library a:nth-child(3n) { border-right: 1px solid var(--line); }
.library a:nth-last-child(-n+3) { border-bottom: 1px solid var(--line); }
.library a:hover { background: var(--ivory); }
.library span { color: var(--red); font-size: 9px; font-weight: 800; }
.library h2 { margin: 34px 0 12px; font-family: var(--serif); font-size: 29px; font-weight: 400; }
.library p { margin: 0; color: var(--muted); font-size: 13px; line-height: 1.65; }
.library b { margin-top: auto; padding-top: 24px; font-size: 11px; }
.learn-footer { display: flex; justify-content: space-between; gap: 30px; padding: 42px clamp(24px,5vw,78px); border-top: 1px solid var(--line); color: var(--muted); font-size: 11px; }
.learn-footer nav { display: flex; flex-wrap: wrap; gap: 18px; }
@media (max-width: 800px) {
  .learn-header { grid-template-columns: 1fr auto; min-height: 66px; padding: 0 16px; }
  .learn-nav { display: none; }
  .learn-brand small { display: none; }
  .article-hero, .article-shell { grid-template-columns: 1fr; }
  .article-hero { gap: 34px; padding-top: 52px; }
  .article-hero h1 { font-size: clamp(46px,15vw,68px); }
  .article-shell { gap: 42px; }
  .sticky-card { position: static; }
  .palace-table { display: block; overflow-x: auto; }
  .cta-band { grid-template-columns: 1fr; }
  .cta-band .learn-button { width: 100%; }
  .library { grid-template-columns: 1fr; }
  .library a, .library a:nth-child(3n), .library a:nth-last-child(-n+3) { border: 1px solid var(--line); border-bottom: 0; }
  .library a:last-child { border-bottom: 1px solid var(--line); }
  .learn-footer { flex-direction: column; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }