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

.challenges-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.challenges-stats .stat-item {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.06);
    text-align: center;
    border-top: 4px solid var(--accent-color);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
    display: block;
}

.stat-label {
    color: #64748b;
    font-size: 0.95rem;
    margin-top: 0.5rem;
    line-height: 1.3;
}

.challenge-categories {
    margin-bottom: 5rem;
}

.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.category-card {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.08);
    transition: transform 0.3s ease;
}

.category-card:hover {
    transform: translateY(-5px);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.category-card h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
}

.category-card ul {
    list-style: none;
    padding: 0;
}

.category-card li {
    padding: 0.5rem 0;
    padding-left: 1rem;
    position: relative;
    color: #4b5563;
}

.category-card li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

.detailed-challenges {
    margin-bottom: 5rem;
}

.challenge-story {
    background: white;
    border-radius: 16px;
    box-shadow: 0 8px 30px rgba(0,0,0,0.1);
    margin-bottom: 3rem;
    overflow: hidden;
}

.challenge-header {
    background: linear-gradient(135deg, #f8fafc, #e2e8f0);
    padding: 2rem;
}

.challenge-badge {
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    color: white;
    display: inline-block;
    margin-bottom: 1rem;
}

.challenge-badge.technical {
    background: #dc2626;
}

.challenge-badge.time {
    background: #f59e0b;
}

.challenge-badge.budget {
    background: #059669;
}

.challenge-badge.logistics {
    background: #7c3aed;
}

.challenge-header h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.5rem;
}

.challenge-meta {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    color: #64748b;
    font-size: 0.9rem;
}

.challenge-content {
    padding: 2rem;
}

.challenge-problem,
.challenge-solution,
.challenge-results,
.lessons-learned {
    margin-bottom: 2rem;
}

.challenge-problem h4,
.challenge-solution h4,
.challenge-results h4,
.lessons-learned h4 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.problem-details {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}

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

.crisis-timeline {
    background: #fef3c7;
    padding: 1.5rem;
    border-radius: 8px;
    margin-top: 1rem;
}

.crisis-item {
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.crisis-item:last-child {
    border-bottom: none;
}

.solution-steps {
    margin-top: 1.5rem;
}

.step-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: flex-start;
}

.step-number {
    background: var(--accent-color);
    color: white;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
    background: #f0f9ff;
    padding: 1rem;
    border-radius: 8px;
}

.step-content h5 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.shift-schedule {
    display: grid;
    gap: 1rem;
    margin-top: 1rem;
}

.shift {
    background: #f1f5f9;
    padding: 1rem;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

.shift h5 {
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

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

.result-metric {
    background: #f0fdf4;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    border-top: 3px solid #16a34a;
}

.metric-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: #16a34a;
    display: block;
}

.metric-label {
    color: #64748b;
    font-size: 0.85rem;
    margin-top: 0.25rem;
}

.success-metrics {
    display: grid;
    gap: 0.5rem;
    margin-top: 1rem;
}

.success-item {
    background: #f0fdf4;
    padding: 0.75rem;
    border-radius: 8px;
    color: #166534;
    font-weight: 500;
}

.budget-strategy {
    display: grid;
    gap: 1.5rem;
    margin-top: 1rem;
}

.strategy-phase {
    background: #f8fafc;
    padding: 1.5rem;
    border-radius: 8px;
    border-left: 4px solid var(--accent-color);
}

.strategy-phase h5 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.strategy-phase ul {
    list-style: none;
    padding: 0;
}

.strategy-phase li {
    padding: 0.25rem 0;
    padding-left: 1rem;
    position: relative;
}

.strategy-phase li::before {
    content: '€';
    position: absolute;
    left: 0;
    color: var(--accent-color);
    font-weight: bold;
}

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

.lessons-learned li {
    padding: 0.75rem 0;
    padding-left: 2rem;
    position: relative;
    border-bottom: 1px solid #f1f5f9;
}

.lessons-learned li::before {
    content: '💡';
    position: absolute;
    left: 0;
    font-size: 1.2rem;
}

.methodology-section {
    background: #f8fafc;
    padding: 4rem 3rem;
    border-radius: 16px;
    margin-bottom: 4rem;
}

.methodology-section h2 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 3rem;
}

.methodology-steps {
    display: grid;
    gap: 2rem;
}

.method-step {
    display: flex;
    gap: 2rem;
    align-items: flex-start;
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.06);
}

.method-number {
    background: var(--primary-color);
    color: white;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: bold;
    flex-shrink: 0;
}

.method-content {
    flex: 1;
}

.method-content h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
}

.method-tools {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.tool {
    background: #e0f2fe;
    color: #0369a1;
    padding: 0.25rem 0.75rem;
    border-radius: 15px;
    font-size: 0.85rem;
    font-weight: 500;
}

.challenge-stats {
    margin-bottom: 4rem;
}

.stats-dashboard {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.stat-category {
    background: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.06);
}

.stat-category h3 {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-align: center;
}

.stat-bars {
    display: grid;
    gap: 1rem;
}

.stat-bar {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-label {
    width: 120px;
    font-size: 0.85rem;
    color: #64748b;
}

.bar {
    flex: 1;
    height: 20px;
    background: #f1f5f9;
    border-radius: 10px;
    overflow: hidden;
}

.fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    transition: width 0.8s ease;
}

.stat-value {
    width: 40px;
    text-align: right;
    font-weight: 600;
    color: var(--primary-color);
}

.success-rate {
    text-align: center;
}

.rate-circle {
    width: 150px;
    height: 150px;
    border: 8px solid var(--accent-color);
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
}

.rate-number {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

.rate-label {
    font-size: 0.75rem;
    color: #64748b;
    text-align: center;
    max-width: 100px;
    line-height: 1.2;
}

.time-metrics {
    display: grid;
    gap: 1rem;
}

.time-metric {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    background: #f8fafc;
    border-radius: 8px;
}

.time-value {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--accent-color);
}

.time-label {
    color: #64748b;
    font-size: 0.9rem;
}

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

.challenges-cta h2 {
    color: white;
    margin-bottom: 1rem;
}

.challenges-cta p {
    font-size: 1.1rem;
    opacity: 0.95;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    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) {
    .challenges-stats {
        grid-template-columns: 1fr;
    }
    
    .categories-grid {
        grid-template-columns: 1fr;
    }
    
    .challenge-meta {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .results-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .method-step {
        flex-direction: column;
        text-align: center;
    }
    
    .stats-dashboard {
        grid-template-columns: 1fr;
    }
    
    .stat-bar {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .stat-label {
        width: auto;
        text-align: center;
    }
    
    .methodology-section {
        padding: 2rem 1rem;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }
}