.contributor-tier {
    margin: 20px 0;
    padding: 20px;
    border-radius: 8px;
    background-color: #f9f9f9;
    border: 1px solid #e0e0e0;
}

.gold-tier {
    background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
    border: 2px solid #d4af37;
}

.silver-tier {
    background: linear-gradient(135deg, #c0c0c0 0%, #e8e8e8 100%);
    border: 2px solid #a8a8a8;
}

.bronze-tier {
    background: linear-gradient(135deg, #cd7f32 0%, #e9b880 100%);
    border: 2px solid #a0522d;
}

.contributor-tier h3 {
    margin-top: 0;
    margin-bottom: 15px;
    font-size: 1.3em;
    color: #333;
}

.contributor-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 10px;
}

.contributor-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 15px;
    background: rgba(255, 255, 255, 0.8);
    border-radius: 6px;
    font-size: 1em;
}

.contributor-name {
    font-weight: bold;
    color: #333;
}

.contributor-count {
    color: #666;
    font-size: 0.9em;
}

@media (max-width: 768px) {
    .contributor-list {
        grid-template-columns: 1fr;
    }
}