.atora-lesson-shell {
    border: 1px solid #dbe2ea;
    border-radius: 18px;
    background: #fff;
}

.atora-lesson-shell .atora-lesson-navigation {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.atora-lesson-shell .atora-video-shell iframe {
    width: 100%;
    aspect-ratio: 16 / 9;
    border: 0;
    border-radius: 12px;
}

.atora-lesson-focus {
    background: linear-gradient(180deg, #f8fafc 0%, #ffffff 100%);
}

.atora-lesson-video {
    background: linear-gradient(180deg, #eff6ff 0%, #ffffff 100%);
}

.atora-lesson-reading {
    background: linear-gradient(180deg, #fefce8 0%, #ffffff 100%);
}

.atora-lesson-assignment {
    background: linear-gradient(180deg, #fff7ed 0%, #ffffff 100%);
}

.atora-lesson-evaluation {
    background: linear-gradient(180deg, #f1f5f9 0%, #ffffff 100%);
    border-color: #94a3b8;
}