.mt-lesson-body {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 20px 48px;
}
.mt-lesson-body .explanation-section {
    margin-bottom: 28px;
}
.mt-lesson-body h2 {
    color: var(--ai-blue-800);
    margin: 0 0 12px;
}
.mt-lesson-body p,
.mt-lesson-body li {
    color: var(--ai-gray-700);
    line-height: 1.55;
}
.mt-lesson-body ul {
    padding-left: 1.25rem;
}
.mt-coming-soon {
    margin-top: 24px;
    padding: 16px 18px;
    background: #fef3c7;
    border: 1px solid #fcd34d;
    border-radius: var(--ai-radius-md);
    font-size: 0.92rem;
    color: #92400e;
}
.mt-lesson-hero {
    text-align: center;
    padding: 24px 20px 8px;
    max-width: 720px;
    margin: 0 auto;
}
.mt-lesson-hero .mt-part-label {
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ai-gray-600);
    margin: 0 0 8px;
}
.mt-lesson-hero h1 {
    margin: 0 0 10px;
    color: var(--ai-blue-800);
    font-size: 1.75rem;
}
.mt-lesson-hero p {
    margin: 0;
    color: var(--ai-gray-600);
    line-height: 1.5;
}