/* Grammar Styles */

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

.intro-section {
    text-align: center;
    margin-bottom: 50px;
    padding: 30px;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1) 0%, rgba(168, 85, 247, 0.1) 100%);
    border-radius: 15px;
}

.intro-section h2 {
    color: #4c1d95;
    font-size: 2rem;
    margin-bottom: 15px;
}

.intro-section p {
    color: #6b7280;
    font-size: 1.1rem;
    line-height: 1.6;
}

.grammar-categories {
    display: flex;
    flex-direction: column;
    gap: 50px;
}

.category-section {
    background: white;
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.category-section h3 {
    color: #1f2937;
    font-size: 1.8rem;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid #e5e7eb;
}

.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 20px;
}

.topic-card {
    background: white;
    border: 2px solid #e5e7eb;
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.topic-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.15);
    border-color: #6366f1;
}

.topic-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.topic-card h4 {
    color: #1f2937;
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.topic-card p {
    color: #6b7280;
    font-size: 0.95rem;
    margin-bottom: 20px;
    flex-grow: 1;
}

.topic-link {
    display: inline-block;
    padding: 10px 25px;
    background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.topic-link:hover {
    transform: scale(1.05);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.topic-link.disabled {
    background: linear-gradient(135deg, #9ca3af 0%, #6b7280 100%);
    cursor: not-allowed;
    opacity: 0.6;
}

.topic-link.disabled:hover {
    transform: none;
    box-shadow: none;
}

/* Category color variations */
.category-section:nth-child(1) h3 {
    color: #6366f1;
    border-bottom-color: #6366f1;
}

.category-section:nth-child(2) h3 {
    color: #ec4899;
    border-bottom-color: #ec4899;
}

.category-section:nth-child(3) h3 {
    color: #10b981;
    border-bottom-color: #10b981;
}

.category-section:nth-child(4) h3 {
    color: #f59e0b;
    border-bottom-color: #f59e0b;
}

.category-section:nth-child(5) h3 {
    color: #ef4444;
    border-bottom-color: #ef4444;
}

/* Responsive Design */
@media (max-width: 768px) {
    .intro-section {
        padding: 20px;
        margin-bottom: 30px;
    }

    .intro-section h2 {
        font-size: 1.5rem;
    }

    .category-section {
        padding: 20px;
    }

    .category-section h3 {
        font-size: 1.4rem;
    }

    .topics-grid {
        grid-template-columns: 1fr;
    }

    .topic-card {
        padding: 20px;
    }

    .grammar-categories {
        gap: 30px;
    }
}