@font-face{font-family:Lexend;src:url(/assets/fonts/lexend.woff2) format('woff2');font-weight:400 600;font-display:swap}
@font-face{font-family:Bricolage;src:url(/assets/fonts/bricolage.woff2) format('woff2');font-weight:600 800;font-display:swap}
/* metric-matched fallbacks keep text from shifting while the web fonts load */
@font-face{font-family:'Lexend Fallback';src:local('Arial');size-adjust:108.76%;ascent-override:91.94%;descent-override:22.99%;line-gap-override:0%}
@font-face{font-family:'Bricolage Fallback';src:local('Arial');size-adjust:107.77%;ascent-override:86.3%;descent-override:25.05%;line-gap-override:0%}

:root{
  --ink:#22242b;--text:#44474f;--muted:#6d717b;
  --bg:#f6f4fb;--card:#fff;--line:#e4e0ee;--lilac:#ebe6f7;
  --berry:#c8285f;--berry-dark:#a51f4d;--lemon:#f3cd3b;
  --mint:#e4f4ec;--mint-ink:#1d6b4b;
  --body:Lexend,'Lexend Fallback',system-ui,sans-serif;
  --head:Bricolage,'Bricolage Fallback',system-ui,sans-serif;
  --bar:64px
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--text);font:400 1rem/1.75 var(--body)}
img{display:block;max-width:100%;height:auto}
a{color:inherit}
:focus-visible{outline:2px solid var(--berry);outline-offset:3px}
h1,h2,h3{font-family:var(--head);color:var(--ink);letter-spacing:-.01em;line-height:1.2;text-wrap:balance}
.shell{width:min(1140px,100% - 40px);margin-inline:auto}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
[id]{scroll-margin-top:calc(var(--bar) + 16px)}

/* header */
.top{position:sticky;top:0;z-index:40;background:#fff;border-bottom:1px solid var(--line)}
.top-row{height:var(--bar);display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:9px;text-decoration:none;font-family:var(--head);font-weight:800;font-size:1.15rem;color:var(--ink);white-space:nowrap}
.logo em,.bottom-brand em{font-style:normal;color:var(--berry)}
.menu{display:flex;gap:22px;margin-left:auto}
.menu a{font-size:.93rem;color:var(--text);text-decoration:none;padding:4px 0;border-bottom:2px solid transparent;transition:border-color .2s,color .2s}
.menu a:hover,.menu a.is-here{color:var(--ink);border-color:var(--lemon)}
.play{flex:none;padding:8px 22px;border-radius:999px;background:var(--berry);color:#fff;font-weight:600;font-size:.93rem;text-decoration:none;transition:background .2s}
.play:hover{background:var(--berry-dark)}
.menu-btn{display:none;margin-left:auto;width:42px;height:42px;padding:10px 9px;border:0;background:none;cursor:pointer;flex-direction:column;justify-content:space-between}
.menu-btn i{display:block;height:2px;border-radius:2px;background:var(--ink);transition:transform .2s,opacity .2s}
.menu-btn[aria-expanded="true"] i:nth-child(2){transform:translateY(9px) rotate(45deg)}
.menu-btn[aria-expanded="true"] i:nth-child(3){opacity:0}
.menu-btn[aria-expanded="true"] i:nth-child(4){transform:translateY(-9px) rotate(-45deg)}

/* opening */
.opening{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:40px;align-items:end;padding:38px 0 26px}
.opening h1{margin:0;font-size:2.15rem;font-weight:800}
.opening p{margin:0;color:var(--text)}

/* slider: image on the left, caption panel on the right */
.showcase{position:relative}
.slides{display:grid;border-radius:20px;overflow:hidden;background:var(--ink)}
.slide{grid-area:1/1;margin:0;display:grid;grid-template-columns:minmax(0,62fr) minmax(0,38fr);opacity:0;visibility:hidden;transition:opacity .6s,visibility .6s}
.slide.is-active{opacity:1;visibility:visible}
.slide img{width:100%;aspect-ratio:16/9;object-fit:cover}
.slide figcaption{display:flex;flex-direction:column;justify-content:center;padding:28px 36px 44px;color:#d9dae0;border-left:4px solid var(--lemon)}
.slide-title{margin:0 0 10px;font-family:var(--head);font-weight:700;font-size:1.6rem;line-height:1.2;color:#fff}
.slide figcaption p:last-child{margin:0}
.dots{position:absolute;right:30px;bottom:18px;display:flex;gap:8px}
.dots button{width:26px;height:6px;padding:0;border:0;border-radius:3px;background:rgba(255,255,255,.3);cursor:pointer;transition:background .2s}
.dots button.is-active{background:var(--lemon)}

/* two-column body with a sticky term index */
.layout{display:grid;grid-template-columns:220px minmax(0,1fr);gap:48px;padding:48px 0 72px}
.index{position:sticky;top:calc(var(--bar) + 20px);align-self:start;font-size:.9rem}
.index-title{margin:0 0 10px;font-family:var(--head);font-weight:700;font-size:1.05rem;color:var(--ink)}
.index ul{list-style:none;margin:0;padding:0}
.index .group{padding:7px 0;border-top:1px solid var(--line)}
.index .group>a{font-weight:600;color:var(--ink);text-decoration:none}
.index .group ul{margin-top:3px;padding-left:12px;border-left:2px solid var(--lilac)}
.index .group li a{display:block;padding:1px 0;color:var(--muted);text-decoration:none}
.index a:hover,.index a.is-here{color:var(--berry)}

.terms{min-width:0}
.chapter{padding-bottom:40px;margin-bottom:40px;border-bottom:1px solid var(--line)}
.chapter:last-child{border-bottom:0;margin-bottom:0}
.chapter h2{margin:0 0 20px;font-size:1.75rem;font-weight:800}
.chapter>p{margin:0 0 14px}
.term{padding:22px 26px;margin-bottom:16px;background:var(--card);border:1px solid var(--line);border-radius:14px}
.term h3{margin:0 0 8px;font-size:1.25rem;font-weight:700;display:flex;align-items:center;gap:10px}
.term h3::before{content:"";flex:none;width:10px;height:10px;border-radius:50%;background:var(--berry);box-shadow:0 0 0 4px #f6d5e1}
.term p{margin:0 0 12px}
.term>p:last-child{margin-bottom:0}
.has-figure::after{content:"";display:block;clear:both}
.term-figure{float:right;width:240px;margin:4px 0 12px 24px;border-radius:12px;overflow:hidden}
.example{clear:both;margin-top:14px;padding:14px 18px;border-radius:10px;background:var(--mint);color:#2c4a3d}
.example p{margin:0}
.example b{color:var(--mint-ink)}

.table-wrap{margin:14px 0 4px;overflow-x:auto;border:1px solid var(--line);border-radius:10px}
table{width:100%;border-collapse:collapse;font-size:.94rem;font-variant-numeric:tabular-nums}
caption{padding:10px 14px;text-align:left;font-size:.85rem;color:var(--muted);background:#faf9fd;border-bottom:1px solid var(--line)}
th,td{padding:9px 14px;text-align:right;border-bottom:1px solid var(--line)}
th:first-child{text-align:left}
thead th{font-weight:600;color:var(--ink);background:var(--lilac)}
tbody th{font-weight:500;color:var(--ink)}
tbody tr:last-child>*{border-bottom:0}
tbody tr:nth-child(even){background:#fcfbfe}

.series{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;margin-top:18px}
.entry{padding:20px 22px;background:var(--card);border:1px solid var(--line);border-top:4px solid var(--lemon);border-radius:12px}
.entry h3{margin:0;font-size:1.12rem;font-weight:700}
.entry .when{margin:2px 0 10px;font-size:.85rem;color:var(--berry);font-weight:500}
.entry p{margin:0}
.entry:last-child:nth-child(odd){grid-column:1/-1}
.entry.has-img img{float:right;width:96px;margin:0 0 8px 14px;border-radius:10px}

.faq details{border-bottom:1px solid var(--line)}
.faq details:first-child{border-top:1px solid var(--line)}
.faq summary{position:relative;padding:15px 36px 15px 0;list-style:none;cursor:pointer;font-weight:600;color:var(--ink)}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:6px;top:22px;width:9px;height:9px;border-right:2px solid var(--berry);border-bottom:2px solid var(--berry);transform:rotate(45deg);transition:transform .2s}
.faq details[open] summary::after{transform:rotate(-135deg);top:26px}
.faq details p{margin:0 0 16px;padding-right:36px}

/* footer */
.bottom{background:var(--ink);color:#b9bbc4;font-size:.9rem}
.bottom-row{display:grid;grid-template-columns:auto 1fr auto;gap:36px;align-items:center;padding:30px 0}
.bottom p{margin:0}
.bottom-brand{font-family:var(--head);font-weight:800;font-size:1.1rem;color:#fff}
.bottom-brand em{color:var(--lemon)}
.bottom-note{white-space:nowrap}

.up{position:fixed;right:18px;bottom:18px;z-index:30;width:42px;height:42px;display:grid;place-items:center;border:0;border-radius:50%;background:var(--ink);color:var(--lemon);cursor:pointer;opacity:0;visibility:hidden;transition:opacity .25s,visibility .25s}
.up.is-on{opacity:1;visibility:visible}

@media (max-width:1020px){
  .menu{gap:16px}
  .menu a{font-size:.88rem}
  .slide figcaption{padding:22px 26px 40px}
  .slide-title{font-size:1.35rem}
}
@media (max-width:900px){
  .menu-btn{display:flex}
  .menu{display:none;position:absolute;left:0;right:0;top:var(--bar);flex-direction:column;gap:0;margin:0;padding:6px 20px 14px;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 12px 24px rgba(34,36,43,.08)}
  .menu.is-open{display:flex}
  .menu a{padding:11px 0;font-size:1rem;border-bottom:1px solid var(--line)}
  .menu a:last-child{border-bottom:0}
  .top-row{gap:12px}
  .play{order:3}
  .layout{grid-template-columns:1fr;gap:28px}
  .index{position:static}
  .index>ul{display:flex;flex-wrap:wrap;gap:8px}
  .index .group{padding:0;border:0}
  .index .group ul{display:none}
  .index .group>a{display:block;padding:6px 14px;border-radius:999px;background:#fff;border:1px solid var(--line);font-size:.88rem}
}
@media (max-width:820px){
  .opening{grid-template-columns:1fr;gap:12px;padding:26px 0 20px}
  .opening h1{font-size:1.75rem}
  .slide{grid-template-columns:1fr}
  .slide figcaption{padding:18px 20px 42px;border-left:0;border-top:4px solid var(--lemon)}
  .dots{right:auto;left:20px;bottom:16px}
  .series{grid-template-columns:1fr}
  .bottom-row{grid-template-columns:1fr;gap:10px}
}
@media (max-width:640px){
  .shell{width:calc(100% - 32px)}
  .logo{font-size:1.02rem}
  .play{padding:7px 16px}
  .term{padding:18px}
  .term-figure{float:none;width:100%;margin:6px 0 14px}
  .chapter h2{font-size:1.45rem}
  th,td{padding:8px 10px}
}
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .slide,.up{transition:none}
}