.learn-hero { padding: 92px 0 88px; }
.learn-hero-inner { max-width: 820px; }
.learn-hero h1 { margin:0; font-size:clamp(46px,6vw,72px); line-height:1.06; letter-spacing:-.047em; font-weight:590; }
.learn-lead { max-width:760px; margin:24px 0 0; color:var(--muted); font-size:clamp(17px,1.7vw,20px); line-height:1.82; }
.learn-index { padding-bottom:104px; }
.learn-list { border-top:1px solid var(--line); }
.learn-card { display:grid; grid-template-columns:120px minmax(0,1fr) auto; gap:28px; align-items:start; padding:28px 0; border-bottom:1px solid var(--line); }
.learn-card:hover h2 { color:var(--accent); }
.learn-card-meta { color:var(--muted); font-size:12px; line-height:1.6; }
.learn-card h2 { margin:0; font-size:clamp(24px,2.7vw,34px); line-height:1.25; letter-spacing:-.03em; transition:color .16s ease; }
.learn-card p { max-width:720px; margin:10px 0 0; color:var(--muted); font-size:15px; line-height:1.75; }
.learn-card-arrow { padding-top:4px; color:var(--accent); font-size:20px; }

.learn-search { padding-bottom:72px; }
.learn-search-control { display:flex; align-items:center; gap:12px; padding:8px 8px 8px 20px; border:1px solid var(--line); border-radius:16px; background:rgba(255,255,255,.58); transition:border-color .16s ease, background .16s ease, box-shadow .16s ease; }
.learn-search-control:focus-within { border-color:var(--accent); background:rgba(255,255,255,.82); box-shadow:0 0 0 3px color-mix(in srgb, var(--accent) 12%, transparent); }
.learn-search-input { min-width:0; flex:1; padding:12px 0; border:0; outline:0; background:transparent; color:var(--ink); font:inherit; font-size:17px; }
.learn-search-input::placeholder { color:var(--muted); opacity:.82; }
.learn-search-clear { flex:0 0 auto; padding:10px 13px; border:0; border-radius:11px; background:transparent; color:var(--muted); font:inherit; font-size:13px; cursor:pointer; }
.learn-search-clear:hover { background:rgba(0,0,0,.045); color:var(--ink); }
.learn-search-help { min-height:1.6em; margin:12px 2px 0; color:var(--muted); font-size:13px; line-height:1.6; }
.learn-search-results { margin-top:26px; border-top:1px solid var(--line); }
.learn-search-result { display:grid; grid-template-columns:120px minmax(0,1fr) auto; gap:28px; align-items:start; padding:24px 0; border-bottom:1px solid var(--line); }
.learn-search-result-meta { color:var(--muted); font-size:12px; line-height:1.6; }
.learn-search-result h3 { margin:0; font-size:clamp(20px,2.2vw,28px); line-height:1.3; letter-spacing:-.025em; }
.learn-search-result p { max-width:720px; margin:8px 0 0; color:var(--muted); font-size:14px; line-height:1.7; }
a.learn-search-result:hover h3 { color:var(--accent); }
.learn-search-result-state { padding-top:3px; color:var(--accent); font-size:13px; white-space:nowrap; }
.learn-search-result[aria-disabled="true"] .learn-search-result-state { color:var(--muted); }
.learn-search-empty { margin:0; padding:28px 0; border-bottom:1px solid var(--line); color:var(--muted); font-size:15px; line-height:1.7; }

.article-shell { width:min(calc(100% - 56px), 820px); margin-inline:auto; }
.article-header { padding:82px 0 54px; }
.article-breadcrumb { margin:0 0 28px; color:var(--muted); font-size:13px; }
.article-breadcrumb a:hover { color:var(--ink); }
.article-kicker { margin:0 0 14px; color:var(--accent); font-size:12px; font-weight:800; letter-spacing:.12em; text-transform:uppercase; }
.article-header h1 { margin:0; font-size:clamp(40px,6vw,64px); line-height:1.08; letter-spacing:-.045em; font-weight:590; }
.article-deck { margin:24px 0 0; color:var(--muted); font-size:clamp(17px,1.9vw,20px); line-height:1.8; }
.article-meta { display:flex; flex-wrap:wrap; gap:10px 18px; margin-top:24px; color:var(--muted); font-size:12px; }
.article-body { padding:0 0 112px; font-size:17px; line-height:1.95; }
.article-body p { margin:0 0 28px; }
.article-body h2 { margin:64px 0 20px; font-size:clamp(28px,3.7vw,38px); line-height:1.22; letter-spacing:-.032em; }
.article-body strong { font-weight:700; }
.article-body code { padding:.08em .36em; border:1px solid var(--line); border-radius:6px; background:rgba(255,255,255,.66); font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace; font-size:.88em; }
.article-body pre { overflow:auto; margin:28px 0 34px; padding:22px 24px; border:1px solid var(--line); border-radius:14px; background:#101a25; color:#edf5f4; line-height:1.65; }
.article-body pre code { padding:0; border:0; background:transparent; color:inherit; font-size:14px; }
.article-flow { margin:34px 0; padding:20px 22px; border-left:3px solid var(--accent); background:rgba(255,255,255,.48); font-family:"SFMono-Regular",Consolas,"Liberation Mono",monospace; font-size:14px; line-height:1.7; }
.article-note { margin:38px 0; padding:24px 26px; border:1px solid var(--line); border-radius:14px; background:rgba(255,255,255,.58); }
.article-note p:last-child { margin-bottom:0; }
.article-ending { margin-top:70px; padding-top:32px; border-top:1px solid var(--ink); }
.article-ending p { font-size:19px; line-height:1.85; }
.article-related { padding-bottom:92px; }
.article-related-card { display:block; padding:26px 0; border-top:1px solid var(--line); border-bottom:1px solid var(--line); }
.article-related-card small { color:var(--muted); }
.article-related-card strong { display:block; margin-top:6px; font-size:21px; letter-spacing:-.02em; }
.article-related-card:hover strong { color:var(--accent); }

/* Learn product surfaces */
.learn-home .learn-hero { padding-bottom:56px; }
.learn-home .learn-search { padding-bottom:52px; }
.learn-home .learn-index .learn-list { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:18px; border-top:0; }
.learn-home .learn-index .learn-card { position:relative; min-height:230px; grid-template-columns:1fr auto; align-content:start; gap:18px; padding:28px; border:1px solid var(--line); border-radius:22px; background:color-mix(in srgb,var(--surface) 78%, transparent); box-shadow:0 10px 34px rgba(11,22,40,.035); transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease; }
.learn-home .learn-index .learn-card:hover { transform:translateY(-3px); border-color:color-mix(in srgb,var(--accent) 28%,var(--line)); box-shadow:0 18px 46px rgba(11,22,40,.07); }
.learn-home .learn-index .learn-card-meta { grid-column:1 / -1; color:var(--accent); font-weight:700; }
.learn-home .learn-index .learn-card h2 { font-size:clamp(28px,3vw,38px); }
.learn-home .learn-index .learn-card p { font-size:15px; }

.learning-roadmap { padding:0 0 70px; }
.learning-roadmap-track { display:grid; grid-template-columns:1fr auto 1fr auto 1fr auto 1fr; align-items:center; gap:14px; padding:20px; border:1px solid var(--line); border-radius:20px; background:color-mix(in srgb,var(--surface) 72%,transparent); }
.learning-roadmap-track > span { min-width:0; display:grid; gap:4px; }
.learning-roadmap-track small { color:var(--accent); font-size:11px; font-weight:800; letter-spacing:.12em; }
.learning-roadmap-track strong { font-size:16px; }
.learning-roadmap-track em { overflow:hidden; color:var(--muted); font-size:12px; font-style:normal; text-overflow:ellipsis; white-space:nowrap; }
.learning-roadmap-track b { color:var(--muted); font-weight:400; }
.learning-home .learn-index .learn-list { display:grid; grid-template-columns:repeat(2,minmax(0,1fr)); gap:18px; border-top:0; }
.learning-home .learn-index .learn-card { position:relative; min-height:290px; display:grid; grid-template-columns:1fr auto; grid-template-rows:auto 1fr; gap:18px; padding:28px; border:1px solid var(--line); border-radius:22px; background:color-mix(in srgb,var(--surface) 78%,transparent); box-shadow:0 10px 34px rgba(11,22,40,.035); transition:transform .18s ease,border-color .18s ease,box-shadow .18s ease; }
.learning-home .learn-index .learn-card:hover { transform:translateY(-3px); border-color:color-mix(in srgb,var(--accent) 28%,var(--line)); box-shadow:0 18px 46px rgba(11,22,40,.07); }
.learning-home .learn-card-meta { grid-column:1 / -1; color:var(--accent); font-weight:800; letter-spacing:.04em; }
.learning-home .learn-card h2 { font-size:clamp(29px,3vw,38px); }
.learning-home .learn-card p { font-size:15px; }
.learn-card-stats { display:flex; flex-wrap:wrap; gap:8px; margin-top:22px; }
.learn-card-stats span { padding:7px 10px; border:1px solid var(--line); border-radius:999px; color:var(--muted); background:color-mix(in srgb,var(--surface) 76%,transparent); font-size:12px; line-height:1.2; }

.explore-toolbar { padding:0 0 42px; }
.explore-search-wrap { display:grid; grid-template-columns:minmax(0,1fr) auto; align-items:center; gap:16px; padding:8px 8px 8px 18px; border:1px solid var(--line); border-radius:16px; background:color-mix(in srgb,var(--surface) 76%,transparent); }
.explore-search { min-width:0; padding:12px 0; border:0; outline:0; background:transparent; color:var(--ink); font:inherit; font-size:16px; }
.explore-search::placeholder { color:var(--muted); }
.explore-count { padding-right:10px; color:var(--muted); font-size:12px; white-space:nowrap; }
.explore-chips { display:flex; gap:8px; overflow:auto; margin-top:14px; padding-bottom:2px; scrollbar-width:none; }
.explore-chips::-webkit-scrollbar { display:none; }
.explore-chip { flex:0 0 auto; padding:9px 13px; border:1px solid var(--line); border-radius:999px; background:color-mix(in srgb,var(--surface) 58%,transparent); color:var(--muted); cursor:pointer; transition:background .16s ease,color .16s ease,border-color .16s ease; }
.explore-chip:hover,.explore-chip.is-active { border-color:var(--accent); background:var(--accent); color:#fff; }
.explore-home .learn-card[hidden] { display:none !important; }
.explore-more { display:block; margin:28px auto 0; padding:12px 18px; border:1px solid var(--line); border-radius:999px; background:color-mix(in srgb,var(--surface) 78%,transparent); color:var(--ink); cursor:pointer; }
.explore-more:hover { border-color:var(--accent); color:var(--accent); }
.explore-empty { margin:0; padding:30px 0; color:var(--muted); border-top:1px solid var(--line); }

.article-course-tools { position:sticky; top:78px; z-index:12; margin-bottom:30px; padding:14px 16px 12px; border:1px solid color-mix(in srgb,var(--line) 88%,transparent); border-radius:16px; background:color-mix(in srgb,var(--bg) 88%,transparent); backdrop-filter:blur(18px); box-shadow:0 12px 35px rgba(11,22,40,.055); }
.article-progress-row { display:flex; justify-content:space-between; gap:18px; color:var(--muted); font-size:11px; letter-spacing:.06em; text-transform:uppercase; }
.article-progress-value { color:var(--accent); font-variant-numeric:tabular-nums; }
.article-progress-track { height:3px; margin:9px 0 8px; overflow:hidden; border-radius:999px; background:var(--line); }
.article-progress-track i { display:block; width:0; height:100%; border-radius:inherit; background:var(--accent); transition:width .12s linear; }
.article-outline summary { display:grid; grid-template-columns:auto minmax(0,1fr); align-items:center; gap:12px; cursor:pointer; list-style:none; }
.article-outline summary::-webkit-details-marker { display:none; }
.article-outline summary > span { color:var(--muted); font-size:12px; }
.article-current-section { overflow:hidden; font-size:13px; font-weight:650; text-overflow:ellipsis; white-space:nowrap; text-align:right; }
.article-outline nav { max-height:min(52vh,420px); overflow:auto; margin-top:12px; padding-top:8px; border-top:1px solid var(--line); }
.article-outline nav a { display:grid; grid-template-columns:34px minmax(0,1fr); gap:8px; padding:8px 6px; border-radius:9px; color:var(--muted); font-size:13px; line-height:1.45; }
.article-outline nav a:hover,.article-outline nav a.is-active { background:color-mix(in srgb,var(--accent) 8%,transparent); color:var(--ink); }
.article-outline nav small { color:var(--accent); font-variant-numeric:tabular-nums; }

@media (max-width:900px){
  .learn-card,.learn-search-result{grid-template-columns:90px minmax(0,1fr) auto;gap:20px}
  .article-shell{width:min(calc(100% - 36px),820px)}
  .learning-roadmap-track{grid-template-columns:1fr 1fr;gap:10px}
  .learning-roadmap-track b{display:none}
}
@media (max-width:700px){
  .learn-home .learn-index .learn-list,.learning-home .learn-index .learn-list{grid-template-columns:1fr}
  .learning-home .learn-index .learn-card{min-height:0}
  .learning-roadmap{padding-bottom:50px}
}
@media (max-width:600px){
  .learn-hero{padding:58px 0 58px}
  .learn-hero h1{font-size:clamp(40px,12vw,52px)}
  .learn-index{padding-bottom:78px}
  .learn-card{grid-template-columns:1fr auto;gap:8px 18px;padding:24px 0}
  .learn-card-meta{grid-column:1 / -1}
  .learn-card p{font-size:14px}
  .learn-search{padding-bottom:58px}
  .learn-search-control{padding-left:15px;border-radius:14px}
  .learn-search-input{font-size:16px}
  .learn-search-result{grid-template-columns:1fr auto;gap:8px 16px;padding:22px 0}
  .learn-search-result-meta{grid-column:1 / -1}
  .learn-search-result p{font-size:13px}
  .article-header{padding:56px 0 42px}
  .article-header h1{font-size:clamp(38px,11vw,50px)}
  .article-body{padding-bottom:86px;font-size:16px;line-height:1.9}
  .article-body h2{margin-top:52px}
  .article-body pre{margin-inline:-4px;padding:18px;border-radius:12px}
  .article-flow,.article-note{margin-left:-4px;margin-right:-4px}
  .learn-home .learn-index .learn-card,.learning-home .learn-index .learn-card{padding:22px;border-radius:18px}
  .learning-roadmap-track{padding:14px;border-radius:16px}
  .learning-roadmap-track em{white-space:normal}
  .explore-search-wrap{grid-template-columns:1fr;padding-left:14px}
  .explore-count{padding:0 0 8px}
  .article-course-tools{top:72px;margin-inline:auto;border-radius:13px;padding:12px 13px 10px}
  .article-outline summary{grid-template-columns:1fr}
  .article-current-section{text-align:left}
}

/* Toolkit app directory */
.toolkit-grid {
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  margin:34px 0 22px;
  border-top:1px solid var(--line);
  border-bottom:1px solid var(--line);
}
.toolkit-app {
  display:flex;
  min-width:0;
  flex-direction:column;
  padding:26px 28px;
  border-bottom:1px solid var(--line);
  background:transparent;
  transition:color .16s ease;
}
.toolkit-app:nth-child(odd) {
  border-right:1px solid var(--line);
}
.toolkit-app:nth-last-child(-n+2) {
  border-bottom:0;
}
.toolkit-app:hover h3 {
  color:var(--accent);
}
.toolkit-app-top {
  display:flex;
  justify-content:space-between;
  gap:14px;
  color:var(--accent);
  font-size:11px;
  font-weight:800;
  letter-spacing:.09em;
  text-transform:uppercase;
}
.toolkit-app h3 {
  margin:14px 0 9px;
  font-size:clamp(24px,2.5vw,31px);
  line-height:1.2;
  letter-spacing:-.03em;
}
.article-body .toolkit-app-summary {
  margin:0 0 18px;
  color:var(--muted);
  font-size:14px;
  line-height:1.7;
}
.toolkit-app-facts {
  display:grid;
  gap:0;
  margin:auto 0 0;
  border:1px solid var(--line);
}
.toolkit-app-facts div {
  display:grid;
  grid-template-columns:72px minmax(0,1fr);
  gap:0;
  padding:0;
  border-bottom:1px solid var(--line);
}
.toolkit-app-facts div:last-child {
  border-bottom:0;
}
.toolkit-app-facts dt {
  display:flex;
  align-items:center;
  padding:10px 12px;
  border-right:1px solid var(--line);
  color:var(--muted);
  font-size:11px;
  font-weight:700;
  letter-spacing:.04em;
}
.toolkit-app-facts dd {
  margin:0;
  padding:10px 12px;
  color:var(--ink);
  font-size:12px;
  line-height:1.55;
}
.article-body .toolkit-footnote {
  margin:18px 0 0;
  color:var(--muted);
  font-size:13px;
  line-height:1.7;
}

@media (max-width:700px){
  .toolkit-grid {
    grid-template-columns:1fr;
  }
  .toolkit-app,
  .toolkit-app:nth-child(odd) {
    border-right:0;
    border-bottom:1px solid var(--line);
  }
  .toolkit-app:last-child {
    border-bottom:0;
  }
}
@media (max-width:600px){
  .toolkit-grid {
    margin-top:26px;
  }
  .toolkit-app {
    padding:22px 0;
  }
  .toolkit-app-facts div {
    grid-template-columns:68px minmax(0,1fr);
  }
  .toolkit-app-facts dt,
  .toolkit-app-facts dd {
    padding:10px;
  }
}