:root {
    --lesson-stub-accent: #ff9800;
}

.lesson-stub {
    min-height: 60vh;
    display: flex;
    justify-content: center;
    padding: 4rem 1.5rem;
}

.lesson-stub-card {
    background: white;
    border-radius: 28px;
    padding: 3rem;
    max-width: 720px;
    width: 100%;
    text-align: center;
    box-shadow: 0 25px 55px rgba(17, 24, 39, 0.16);
    border: 1px solid rgba(255, 167, 38, 0.25);
}

.lesson-stub-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.3rem;
    border-radius: 999px;
    font-weight: 700;
    color: var(--lesson-stub-accent);
    background: rgba(255, 167, 38, 0.15);
}

.lesson-stub-card h1 {
    font-size: 2.4rem;
    margin: 1.5rem 0 0.8rem;
    color: #2d1f12;
}

.lesson-stub-card p {
    color: #5b5042;
    font-size: 1.05rem;
    line-height: 1.7;
}

.lesson-stub-actions {
    margin-top: 2rem;
}

.lesson-stub-actions .btn-secondary {
    padding: 0.9rem 1.4rem;
    width: 100%;
    max-width: 260px;
    margin: 0 auto;
}

@media (max-width: 640px) {
    .lesson-stub-card {
        padding: 2rem;
    }

    .lesson-stub-card h1 {
        font-size: 2rem;
    }
}