/* --- Lesson Specific Styles --- */

/* Lesson Header */
.lesson-header {
    text-align: center;
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--border-color);
}

.lesson-number {
    display: inline-block;
    background-color: #e8f0fe;
    color: var(--primary-color);
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.lesson-title {
    font-size: 2.2rem;
    color: var(--text-color);
    margin: 0.5rem 0;
    line-height: 1.3;
}

.lesson-subtitle {
    font-size: 1.1rem;
    color: #5f6368;
    font-weight: 400;
}

/* Content Structure */
.lesson-content {
    max-width: 900px;
    margin: 0 auto;
}

.content-box {
    background-color: var(--card-bg);
    padding: 2.5rem;
    border-radius: 24px;
    box-shadow: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 1px 3px 1px rgba(60, 64, 67, 0.15);
    border: 1px solid var(--border-color);
    margin-bottom: 2.5rem;
}

.content-box h2 {
    font-size: 1.6rem;
    margin-bottom: 1.2rem;
    color: var(--primary-color);
    border-left: 4px solid var(--secondary-color);
    padding-left: 15px;
}

.content-box p {
    margin-bottom: 1rem;
    color: #3c4043;
}

.content-box ul,
.content-box ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
    color: #3c4043;
}

.content-box li {
    margin-bottom: 0.5rem;
}

.content-box strong {
    color: var(--text-color);
    font-weight: 600;
}

/* Table Styles */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.95rem;
}

.comparison-table th,
.comparison-table td {
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    text-align: left;
}

.comparison-table th {
    background-color: #f1f3f4;
    font-weight: 600;
    color: var(--text-color);
}

.comparison-table tr:nth-child(even) {
    background-color: #f8f9fa;
}

/* Example Box (Google Style) */
.example-box {
    background-color: #f8f9fa;
    border-left: 4px solid var(--primary-color);
    padding: 1.5rem;
    border-radius: 0 8px 8px 0;
    margin: 1.5rem 0;
}

.example-box h4 {
    margin-top: 0;
    color: var(--text-color);
    font-size: 1.1rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 8px;
}

.example-box h4 i {
    color: var(--primary-color);
}

/* Lesson Navigation */
.lesson-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 4rem;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.lesson-nav a {
    display: inline-flex;
    align-items: center;
    padding: 0.8rem 1.5rem;
    border-radius: 24px;
    font-weight: 500;
    transition: all 0.2s ease;
    border: 1px solid var(--border-color);
    color: var(--primary-color);
    text-decoration: none;
}

.lesson-nav a:not(.disabled):hover {
    background-color: #e8f0fe;
    border-color: #e8f0fe;
    color: var(--primary-color);
    transform: translateY(-2px);
}

.lesson-nav a.disabled {
    border-color: #dadce0;
    color: #dadce0;
    cursor: not-allowed;
    pointer-events: none;
}

.lesson-nav .fa-chevron-left {
    margin-right: 8px;
}

.lesson-nav .fa-chevron-right,
.lesson-nav .fa-arrow-right {
    margin-left: 8px;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .lesson-title {
        font-size: 1.8rem;
    }

    .lesson-nav {
        flex-direction: column;
        gap: 1rem;
    }

    .lesson-nav a {
        justify-content: center;
        width: 100%;
    }
}