/* Lesson-specific styles */
.lesson-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

.lesson-header {
    text-align: center;
    margin-bottom: 2rem;
}

.lesson-header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
}

.lesson-header p {
    font-size: 1.2rem;
    color: #666;
}

.lesson-nav {
    display: flex;
    justify-content: space-between;
    margin-bottom: 2rem;
    padding: 1rem 0;
    border-top: 1px solid #eee;
    border-bottom: 1px solid #eee;
}

.lesson-nav-item {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
}

.lesson-content {
    font-size: 1.1rem;
    line-height: 1.7;
}

.lesson-section {
    margin-bottom: 3rem;
}

.lesson-section h2 {
    color: var(--dark-color);
    font-size: 1.8rem;
    margin-bottom: 1rem;
    text-align: left;
}

.lesson-section h3 {
    color: var(--primary-color);
    font-size: 1.4rem;
    margin: 1.5rem 0 0.8rem;
}

.lesson-section p {
    margin-bottom: 1rem;
}

.lesson-section ul {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.lesson-section li {
    margin-bottom: 0.5rem;
}

/* Info boxes */
.info-box {
    display: flex;
    background-color: rgba(74, 144, 226, 0.1);
    border-left: 4px solid var(--primary-color);
    padding: 1rem;
    border-radius: 4px;
    margin: 1.5rem 0;
    align-items: center;
}

.info-icon {
    margin-right: 1rem;
    flex-shrink: 0;
}

.info-box p {
    margin: 0;
}

/* Example boxes */
.example-box {
    background-color: #f8f9fa;
    border: 1px solid #eee;
    padding: 1.5rem;
    border-radius: 6px;
    margin: 1.5rem 0;
}

.alphabet-shift {
    font-family: monospace;
    white-space: nowrap;
    overflow-x: auto;
    margin-bottom: 1rem;
}

.alphabet {
    font-size: 1.2rem;
    letter-spacing: 0.4rem;
    padding: 0.5rem 0;
}

.shifted {
    color: var(--primary-color);
    font-weight: bold;
}

.shift-arrow {
    color: #888;
    letter-spacing: 0.4rem;
}

/* Interactive demos */
.interactive-demo {
    background-color: white;
    border: 1px solid #ddd;
    border-radius: 8px;
    padding: 1.5rem;
    margin: 2rem 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.input-group {
    margin-bottom: 1rem;
}

.input-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.input-group textarea,
.input-group input {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: 4px;
    font-family: var(--font-main);
}

.input-group textarea {
    min-height: 6rem;
    resize: vertical;
}

.button-group {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
}

.result-group {
    background-color: #f8f9fa;
    padding: 1rem;
    border-radius: 4px;
    border-left: 4px solid var(--primary-color);
}

.result-group h4 {
    margin-bottom: 0.5rem;
    color: var(--primary-color);
}

.result {
    font-family: monospace;
    font-size: 1.1rem;
    white-space: pre-wrap;
    word-break: break-all;
}

/* Historical notes */
.history-note {
    background-color: #fffaf0;
    border-left: 4px solid var(--accent-color);
    padding: 1.5rem;
    border-radius: 4px;
    margin: 1.5rem 0;
}

.history-note h3 {
    color: var(--accent-color);
    margin-top: 0;
}

/* Summary box */
.summary-box {
    background-color: rgba(92, 184, 92, 0.1);
    border-left: 4px solid var(--secondary-color);
    padding: 1.5rem;
    border-radius: 4px;
    margin: 1.5rem 0;
}

.summary-box h3 {
    color: var(--secondary-color);
    margin-top: 0;
}

.summary-box ul {
    margin-bottom: 0;
}

/* Lesson navigation */
.lesson-navigation {
    display: flex;
    justify-content: space-between;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid #eee;
}

/* Media queries */
@media (max-width: 768px) {
    .lesson-navigation {
        flex-direction: column;
        gap: 1rem;
    }
    
    .alphabet {
        font-size: 1rem;
        letter-spacing: 0.2rem;
    }
    
    .shift-arrow {
        letter-spacing: 0.2rem;
    }
}