/* Course Detail Page */
.course-overview{display:grid;grid-template-columns:1fr 340px;gap:3rem;align-items:start}
.course-content h2{margin-top:2.5rem;margin-bottom:1rem}
.course-content h2:first-child{margin-top:0}
.course-content h3{margin-top:1.5rem;margin-bottom:.75rem;font-size:1.125rem}
.course-content p{font-size:1rem;line-height:1.8}
.course-content ul{margin:1rem 0;padding-left:0}
.course-content ul li{padding:.5rem 0 .5rem 1.75rem;position:relative;font-size:.9375rem;color:var(--text-light);border-bottom:1px solid var(--gray-100)}
.course-content ul li:last-child{border-bottom:none}
.course-content ul li::before{content:'';position:absolute;left:0;top:.875rem;width:8px;height:8px;border-radius:50%;background:var(--blue)}
.chapter-grid{display:grid;grid-template-columns:1fr 1fr;gap:.75rem;margin:1rem 0}
.chapter-item{display:flex;align-items:center;gap:.5rem;padding:.625rem .875rem;background:var(--gray-50);border-radius:var(--radius);font-size:.875rem;color:var(--text);border:1px solid var(--gray-100)}
.chapter-item svg{width:16px;height:16px;color:var(--blue);flex-shrink:0}
.course-sidebar{position:sticky;top:90px}
.sidebar-card{padding:2rem;margin-bottom:1.5rem}
.sidebar-card h3{margin-bottom:1.25rem;font-size:1.125rem}
.sidebar-detail{display:flex;align-items:center;gap:.75rem;padding:.75rem 0;border-bottom:1px solid var(--gray-100);font-size:.9375rem}
.sidebar-detail:last-child{border-bottom:none}
.sidebar-detail svg{width:18px;height:18px;color:var(--blue);flex-shrink:0}
.sidebar-detail strong{color:var(--navy);margin-right:auto}
.sidebar-cta{margin-top:1.5rem}
.sidebar-cta .btn{width:100%;justify-content:center;margin-bottom:.75rem}
.related-courses{background:var(--gray-50)}
.related-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:var(--gap)}
@media(max-width:1024px){.course-overview{grid-template-columns:1fr}.course-sidebar{position:static}.related-grid{grid-template-columns:repeat(2,1fr)}}
@media(max-width:640px){.chapter-grid,.related-grid{grid-template-columns:1fr}}