:root{--bs-primary:#2563eb}body{background:#f8fafc;color:#172033}.navbar{background:#fff}.brand-logo{width:34px;height:34px;object-fit:contain}.course-card{border-radius:18px;transition:transform .15s ease}.course-card:hover{transform:translateY(-2px)}.course-logo{width:58px;height:58px;border-radius:14px;background:#eff6ff;display:flex;align-items:center;justify-content:center;margin-bottom:16px;overflow:hidden}.course-logo img{width:100%;height:100%;object-fit:contain}.course-logo span{font-weight:800;color:#2563eb;font-size:22px}.auth-card{max-width:460px}.btn-primary{background:#2563eb;border-color:#2563eb}.card{border-radius:18px}.lesson{cursor:pointer}.lesson.active{background:#eff6ff;font-weight:600}footer{background:#fff}