.intro-section {
    text-align: center;
    margin-bottom: 4rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.case-study {
    background: white;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    margin-bottom: 3rem;
    overflow: hidden;
}

.case-study-header {
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    padding: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.case-category {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 500;
}

.case-study-header h3 {
    margin: 1rem 0 0.5rem 0;
    color: var(--primary-color);
}

.case-meta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.case-meta span {
    color: #64748b;
    font-size: 0.9rem;
}

.status-badge {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.status-badge.completed {
    background: #dcfce7;
    color: #166534;
}

.status-badge.in-progress {
    background: #fef3c7;
    color: #d97706;
}

.case-study-content {
    padding: 2rem;
}

.case-challenge,
.case-solution,
.case-results,
.case-lessons,
.case-progress {
    margin-bottom: 2rem;
}

.case-challenge h4,
.case-solution h4,
.case-results h4,
.case-lessons h4,
.case-progress h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.challenge-points {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}

.challenge-point {
    background: #fef2f2;
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid #ef4444;
}

.solution-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.solution-item {
    background: #f0f9ff;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.solution-item h5 {
    margin-bottom: 0.75rem;
    color: var(--primary-color);
}

.solution-item ul {
    list-style: none;
    padding: 0;
}

.solution-item li {
    padding: 0.25rem 0;
    padding-left: 1rem;
    position: relative;
    color: #374151;
}

.solution-item li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-color);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.result-metric {
    text-align: center;
    background: #f8fafc;
    padding: 1.5rem;
    border-radius: 8px;
}

.metric-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--accent-color);
    display: block;
}

.metric-label {
    color: #64748b;
    font-size: 0.9rem;
    margin-top: 0.5rem;
}

.client-testimonial {
    background: #f1f5f9;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1.5rem;
    border-left: 4px solid var(--primary-color);
}

.client-testimonial blockquote {
    font-style: italic;
    margin: 0 0 0.5rem 0;
    color: #374151;
}

.client-testimonial cite {
    color: #64748b;
    font-size: 0.9rem;
}

.case-lessons ul {
    list-style: none;
    padding: 0;
}

.case-lessons li {
    padding: 0.75rem 0;
    padding-left: 1rem;
    position: relative;
    color: #374151;
    border-bottom: 1px solid #f1f5f9;
}

.case-lessons li::before {
    content: '💡';
    position: absolute;
    left: 0;
}

.results-summary {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.result-item {
    background: #dcfce7;
    color: #166534;
    padding: 0.75rem 1rem;
    border-radius: 20px;
    font-weight: 500;
    font-size: 0.9rem;
}

.progress-timeline {
    margin-top: 1rem;
}

.progress-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    margin-bottom: 0.5rem;
    border-radius: 8px;
}

.progress-item.completed {
    background: #dcfce7;
}

.progress-item.current {
    background: #fef3c7;
}

.progress-item.pending {
    background: #f1f5f9;
}

.studies-cta {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 3rem;
    border-radius: 16px;
    text-align: center;
    margin-top: 4rem;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-top: 1.5rem;
    flex-wrap: wrap;
}

.btn-secondary {
    background: rgba(255,255,255,0.1);
    border: 2px solid white;
    color: white;
}

.btn-secondary:hover {
    background: white;
    color: var(--primary-color);
}

@media (max-width: 768px) {
    .case-study-header {
        flex-direction: column;
        gap: 1rem;
    }
    
    .case-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .solution-grid {
        grid-template-columns: 1fr;
    }
    
    .results-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .results-summary {
        flex-direction: column;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
}