.residential-photo{margin:1.5rem 0;background:var(--course-soft);padding:1rem;border-radius:1rem}.residential-photo img{display:block;max-height:520px;width:100%;object-fit:contain;background:#fff}.residential-photo figcaption{font-size:.9rem;line-height:1.5}.residential-concept{width:100%;max-height:360px;object-fit:contain}.lesson details{padding:1rem;background:var(--course-soft);margin:1rem 0;border-radius:.6rem}.lesson summary{font-weight:650;cursor:pointer}.residential-celebration{font-size:1.2rem;font-weight:700;color:var(--course-deep);padding:1rem;animation:residential-sparkle .6s ease-in-out 2}.residential-shell .card{margin-bottom:1rem}.course-plumbing{--blue:#075C99;--course-deep:#063A61;--course-soft:#EAF5FF}.course-roofing{--blue:#43536B;--course-deep:#273449;--course-soft:#EDF2F8}.course-foundations{--blue:#6936A4;--course-deep:#412269;--course-soft:#F4EEFC}.course-structure{--blue:#006B68;--course-deep:#004440;--course-soft:#E8F7F5}.course-plumbing,.course-roofing,.course-foundations,.course-structure{border-top:6px solid var(--blue)}.course-card .button{background:var(--blue);color:#fff}.course-card .button.secondary{background:var(--course-soft);color:var(--course-deep)}@keyframes residential-sparkle{50%{transform:scale(1.015)}}@media(prefers-reduced-motion:reduce){.residential-celebration{animation:none}}@media(max-width:600px){.residential-photo{padding:.5rem;margin:1rem 0}.residential-photo img{max-height:360px}.residential-controls .button{flex:1 1 45%;white-space:normal}}