/* ============================================
   18. ANIMATIONS & KEYFRAMES
   ============================================ */

@keyframes fadeIn {
    from {
        opacity:0;
        transform:translateY(20px);
    }
    to {
        opacity:1;
        transform:translateY(0);
    }
}

.lesson-card {
    animation:fadeIn 0.4s ease-out;
    animation-fill-mode:both;
}

.lesson-card:nth-child(1) { animation-delay:0.05s; }
.lesson-card:nth-child(2) { animation-delay:0.1s; }
.lesson-card:nth-child(3) { animation-delay:0.15s; }
.lesson-card:nth-child(4) { animation-delay:0.2s; }
.lesson-card:nth-child(5) { animation-delay:0.25s; }
.lesson-card:nth-child(6) { animation-delay:0.3s; }
.lesson-card:nth-child(7) { animation-delay:0.35s; }
.lesson-card:nth-child(8) { animation-delay:0.4s; }
.lesson-card:nth-child(9) { animation-delay:0.45s; }
.lesson-card:nth-child(10) { animation-delay:0.5s; }
.lesson-card:nth-child(11) { animation-delay:0.55s; }
.lesson-card:nth-child(12) { animation-delay:0.6s; }