.course-lessons { list-style:none; padding:0; display:grid; gap:1rem; }
.course-lesson { border:1px solid var(--border, #d5ddd8); padding:1rem; border-radius:12px; }
.course-lesson h3 { margin:0 0 .5rem; font-size:1.1rem; }
.course-lesson p { margin:0 0 .85rem; }
.course-player video { width:100%; height:auto; max-height:70vh; background:#101815; border-radius:8px; }
.course-player h3:focus { outline:2px solid currentColor; outline-offset:5px; }
.course-lesson .btn { white-space:normal; min-height:44px; }
.course-lessons button:disabled { opacity:1; background:#edf1ee; color:#46554c; cursor:default; }
@media (max-width:480px) { .course-lesson .btn { width:100%; } }