/* Vocabulary from Classical Roots Styles */

.book-content {
    max-width: 1200px;
    margin: 0 auto;
}

.book-intro {
    background: linear-gradient(135deg, #f0f4ff 0%, #e8f0fe 100%);
    border: 3px solid #b8d4ff;
    border-radius: 15px;
    padding: 30px;
    margin-bottom: 40px;
    text-align: center;
}

.book-intro h2 {
    color: #5a67d8;
    font-size: 2em;
    margin-bottom: 15px;
}

.book-intro p {
    color: #2d3748;
    font-size: 1.2em;
    line-height: 1.6;
}

/* Lessons Section */
.lessons-section {
    margin-bottom: 40px;
}

.lessons-section h2 {
    color: #2d3748;
    font-size: 2em;
    margin-bottom: 25px;
    text-align: center;
}

.lessons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.lesson-card {
    background: white;
    border: 3px solid #e2e8f0;
    border-radius: 15px;
    padding: 25px;
    text-align: center;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.lesson-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, #667eea 0%, #764ba2 100%);
}

.lesson-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(90, 103, 216, 0.2);
    border-color: #5a67d8;
}

.lesson-number {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 8px 20px;
    border-radius: 20px;
    font-weight: bold;
    font-size: 1.1em;
    margin-bottom: 15px;
}

.lesson-card h3 {
    color: #2d3748;
    font-size: 1.5em;
    margin-bottom: 10px;
}

.lesson-card p {
    color: #718096;
    margin-bottom: 20px;
    line-height: 1.5;
}

.lesson-link {
    display: inline-block;
    padding: 10px 25px;
    background: linear-gradient(135deg, #48bb78 0%, #38a169 100%);
    color: white;
    text-decoration: none;
    border-radius: 20px;
    font-weight: bold;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(72, 187, 120, 0.3);
}

.lesson-link:hover {
    transform: scale(1.05);
    box-shadow: 0 6px 18px rgba(72, 187, 120, 0.5);
}

.lesson-link.disabled {
    background: #cbd5e0;
    cursor: not-allowed;
    box-shadow: none;
}

.lesson-link.disabled:hover {
    transform: none;
}

/* Practice Section */
.practice-section {
    background: #fafafa;
    border-radius: 15px;
    padding: 30px;
    border: 2px solid #e2e8f0;
}

.practice-section h2 {
    color: #2d3748;
    font-size: 2em;
    margin-bottom: 25px;
    text-align: center;
}

.practice-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.practice-card {
    background: white;
    border: 2px solid #e2e8f0;
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    transition: all 0.3s ease;
}

.practice-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    border-color: #5a67d8;
}

.practice-icon {
    font-size: 3em;
    margin-bottom: 15px;
}

.practice-card h3 {
    color: #2d3748;
    font-size: 1.4em;
    margin-bottom: 10px;
}

.practice-card p {
    color: #718096;
    margin-bottom: 15px;
    line-height: 1.5;
}

.practice-link {
    display: inline-block;
    padding: 8px 20px;
    background: linear-gradient(135deg, #ed8936 0%, #dd6b20 100%);
    color: white;
    text-decoration: none;
    border-radius: 18px;
    font-weight: bold;
    font-size: 0.95em;
    transition: all 0.3s ease;
    box-shadow: 0 3px 10px rgba(237, 137, 54, 0.3);
}

.practice-link:hover {
    transform: scale(1.05);
    box-shadow: 0 5px 15px rgba(237, 137, 54, 0.5);
}

.practice-link.disabled {
    background: #cbd5e0;
    cursor: not-allowed;
    box-shadow: none;
}

.practice-link.disabled:hover {
    transform: none;
}

/* Responsive Design */
@media (max-width: 768px) {
    .book-intro {
        padding: 20px;
    }
    
    .book-intro h2 {
        font-size: 1.6em;
    }
    
    .book-intro p {
        font-size: 1em;
    }
    
    .lessons-grid,
    .practice-grid {
        grid-template-columns: 1fr;
    }
    
    .practice-section {
        padding: 20px;
    }
}