.course-shell [hidden]{display:none!important}.course-mobile-toc{display:none}.course-shell{width:min(1120px,100% - 40px);margin:0 auto;padding:44px 0 64px}.course-kicker{color:var(--green);letter-spacing:.14em;text-transform:uppercase;font-size:13px;font-weight:700}.course-back-link{border:1px solid var(--line);color:var(--green);background:#faf9f3;border-radius:999px;align-items:center;margin-bottom:22px;padding:6px 12px;font-size:13px;font-weight:700;display:inline-flex}.course-back-link:hover{background:#e8f1ec;border-color:#9fc2b4}.course-shell h1{text-wrap:balance;font:800 clamp(32px, 4vw, 48px)/1.2 var(--serif);letter-spacing:-.03em;max-width:850px;margin:12px 0 16px}.course-lead{color:#3d4d47;max-width:760px;margin:0;font-size:17px;line-height:1.75}.exploration-focus{border-left:4px solid var(--green);background:#f0f4ee;border-radius:0 10px 10px 0;max-width:720px;margin-top:24px;padding:16px 20px}.exploration-focus strong{color:var(--green);margin-bottom:4px;font-size:14px;display:block}.exploration-focus p{margin:0;line-height:1.75}.course-start{background:var(--green);color:#fff;border-radius:8px;margin:14px 0;padding:12px 20px;font-weight:700;text-decoration:none;display:inline-block}.course-note{color:var(--muted);font-size:14px;line-height:1.7}.course-outline{margin:24px 0 40px;padding:0;list-style:none}.course-outline li{border-bottom:1px solid var(--line);grid-template-columns:54px minmax(0,760px);align-items:start;gap:22px;max-width:900px;padding:22px 18px;transition:background .16s,border-color .16s;display:grid}.course-outline li:first-child{border-top:1px solid var(--line)}.course-outline li:has(h3 a):hover,.course-outline li:has(h3 a):focus-within{background:#f0f4ee;border-radius:10px}.course-number{color:var(--green);font-variant-numeric:tabular-nums;padding-top:2px;font-size:20px}.course-outline h3{margin:0 0 7px;font-size:20px}.course-outline h3 a{color:var(--ink);text-decoration:none}.course-outline p{color:var(--muted);margin:0;line-height:1.7}.course-outline .is-unpublished h3,.course-outline .is-unpublished p{color:var(--muted)}.course-explore{background:#f0f4ee;border-radius:12px;padding:24px}.course-explore h2{margin-top:0}.course-explore-list{grid-template-columns:repeat(auto-fit,minmax(280px,1fr));gap:14px;margin:20px 0 12px;display:grid}.course-explore-card{border:1px solid var(--line);background:var(--card);border-radius:10px;flex-direction:column;padding:20px;display:flex}.course-explore-card .course-kicker{font-size:12px}.course-explore-card h3{margin:8px 0 10px;font-size:21px;line-height:1.45}.course-explore-card p:not(.course-kicker){color:var(--muted);flex:1;margin:0 0 16px;line-height:1.7}.course-explore-link{color:var(--green);font-weight:700}.course-layout{grid-template-columns:minmax(0,720px) 220px;gap:54px;margin-top:32px;display:grid}.course-body{min-width:0;font-size:18px;line-height:1.95}.course-overview,.course-takeaways{border:1px solid var(--line);background:#f0f4ee;border-radius:12px;margin-bottom:34px;padding:20px 24px}.course-overview{display:block}.course-overview>div+div{border-top:1px solid var(--line);margin-top:18px;padding-top:18px}.course-overview+h2{margin-top:0}.course-overview h2,.course-takeaways h2{margin:0 0 10px;font-size:21px}.course-overview p,.course-overview ul,.course-takeaways ul{margin:0}.course-overview li,.course-takeaways li{margin:6px 0}.course-model{border-left:4px solid var(--green);background:#f0f4ee;border-radius:0 12px 12px 0;margin:0 0 34px;padding:18px 22px}.course-model p{margin:0;line-height:1.8}.course-model-label{color:var(--green);font-size:15px;font-weight:700;margin-bottom:6px!important}.course-model-note{color:var(--muted);font-size:14px;margin-top:8px!important}.course-takeaways{background:#fffef9;margin:42px 0 0}.learning-self-check{border:1px solid var(--line);background:#f0f4ee;border-radius:12px;margin:36px 0 0;padding:22px 24px}.learning-self-check-kicker{color:var(--green);font-size:14px;font-weight:700;margin:0 0 6px!important}.course-body .learning-self-check h2{margin:0 0 10px;font-size:23px}.learning-self-check>p:not(.learning-self-check-kicker):not(.learning-self-check-status){color:var(--muted);margin:0}.learning-self-check-options{flex-wrap:wrap;gap:10px;margin-top:16px;display:flex}.learning-self-check button{border:1px solid var(--line);background:var(--paper);min-height:44px;color:var(--ink);font:inherit;cursor:pointer;border-radius:9px;padding:9px 14px}.learning-self-check button:hover,.learning-self-check button[aria-pressed=true]{border-color:var(--green);background:var(--mint)}.learning-self-check-status{color:var(--muted);font-size:14px;margin:12px 0 0!important}.course-body h2{margin:42px 0 16px;scroll-margin-top:90px;font-size:26px}.course-body h2:first-child{margin-top:0}.course-body p{margin:16px 0}.course-body blockquote{border-left:4px solid var(--green);background:#f0f4ee;margin:24px 0;padding:16px 22px}.course-body details{border:1px solid var(--line);border-radius:10px;margin:24px 0;padding:16px 20px}.course-body summary{cursor:pointer;font-weight:700}.course-toc{align-self:start;font-size:14px;position:sticky;top:90px}.course-toc a{margin:14px 0;line-height:1.6;display:block}.course-actions{border-top:1px solid var(--line);margin-top:36px;padding-top:24px}.course-actions a{margin:12px 0;display:inline-block}.course-chapter-nav{border-bottom:1px solid var(--line);grid-template-columns:repeat(2,minmax(0,1fr));gap:0;margin-bottom:12px;display:grid}.course-chapter-link{min-height:76px;color:var(--ink);flex-direction:column;justify-content:center;gap:6px;padding:14px 0;text-decoration:none;margin:0!important;display:flex!important}.course-chapter-link.previous{padding-right:24px}.course-chapter-link.next{border-left:1px solid var(--line);text-align:right;grid-column:2;padding-left:24px}.course-chapter-link:only-child{text-align:left;border-left:0;grid-column:1/-1}.course-chapter-link:hover{background:#f0f4ee}.course-chapter-link span{color:var(--muted);font-size:13px;font-weight:700}.course-chapter-link strong{font-size:17px;line-height:1.5}.course-chapter-link:hover strong{color:var(--green)}.course-actions .course-action-secondary{border:1px solid var(--line);background:var(--paper);min-height:44px;color:var(--green);border-radius:9px;align-items:center;padding:10px 16px;font-weight:700;text-decoration:none;display:inline-flex}.course-actions .course-action-secondary:hover{background:#e8f1ec;border-color:#9fc2b4}.course-shell a:focus-visible,.course-shell button:focus-visible,.course-shell summary:focus-visible{outline:3px solid var(--green);outline-offset:4px}.course-body li{margin:8px 0}@media (width<=760px){.course-mobile-toc{border-bottom:1px solid var(--line);margin-top:24px;padding-bottom:14px;display:block}.course-mobile-toc summary{cursor:pointer;font-weight:700}.course-mobile-toc a{margin-top:12px;line-height:1.7;display:block}.course-layout>.course-toc{display:none}.course-shell{padding:28px 0 44px}.course-layout{flex-direction:column;gap:20px;display:flex}.course-toc{border-bottom:1px solid var(--line);order:-1;padding-bottom:12px;position:static}.course-toc a{margin:6px 16px 6px 0;display:inline-block}.course-body{font-size:17px}.course-overview{padding:18px 20px;display:block}.course-outline li{grid-template-columns:34px minmax(0,1fr);gap:14px;padding:18px 10px}.course-lead{font-size:17px}.course-explore{padding:20px}.course-chapter-nav{grid-template-columns:1fr;gap:10px}.course-chapter-link.previous{padding-right:0}.course-chapter-link.next{text-align:left;border-left:0;grid-column:auto;padding-left:0}.course-chapter-link:only-child{grid-column:auto}.learning-self-check{padding:18px 20px}.course-body h2{font-size:23px}}