.cert-stats-container {
    max-width: 1200px;
    margin: 20px auto;
    padding: 0 20px;
}

.cert-stats-card {
    background: #ffffff;
    border: 1px solid #e1e8ed;
    border-radius: 8px;
    padding: 30px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    margin-bottom: 30px;
}

.cert-stats-card h3 {
    margin-top: 0;
    margin-bottom: 25px;
    color: #1a3a52;
    font-size: 22px;
    text-align: center;
    padding-bottom: 15px;
    border-bottom: 2px solid #4a90e2;
}

.cert-stats-chart-wrapper {
    position: relative;
    width: 100%;
    margin: 0 auto;
}

.cert-stats-chart-wrapper canvas {
    max-width: 100%;
    height: auto !important;
}

.cert-stats-loading {
    text-align: center;
    padding: 40px;
    color: #4a90e2;
    font-size: 16px;
}

.cert-stats-loading::after {
    content: '';
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid #4a90e2;
    border-top-color: transparent;
    border-radius: 50%;
    animation: cert-stats-spin 0.8s linear infinite;
    margin-left: 10px;
    vertical-align: middle;
}

@keyframes cert-stats-spin {
    to { transform: rotate(360deg); }
}

.cert-stats-error {
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: 8px;
    padding: 20px;
    color: #991b1b;
    text-align: center;
}

/* Responsive design */
@media (max-width: 768px) {
    .cert-stats-container {
        padding: 0 10px;
    }
    
    .cert-stats-card {
        padding: 20px 15px;
    }
    
    .cert-stats-card h3 {
        font-size: 18px;
    }
}