:root {
    --cei-primary: #1a3a5c;
    --cei-accent: #2d6a9f;
    --cei-success: #28a745;
    --cei-warning: #ffc107;
    --cei-danger: #dc3545;
    --cei-bg: #f0f4f8;
    --cei-card-bg: #ffffff;
    --cei-border: #c9d6e0;
}

body {
    background-color: var(--cei-bg);
    font-family: -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 14px;
}

.cei-navbar {
    background: linear-gradient(135deg, var(--cei-primary) 0%, var(--cei-accent) 100%);
    box-shadow: 0 2px 8px rgba(0,0,0,0.15);
    padding: 10px 20px;
}

.cei-navbar .navbar-brand {
    font-weight: 600;
    font-size: 1.1rem;
    color: #fff;
}

.cei-tabs {
    border-bottom: 2px solid var(--cei-primary);
}

.cei-tabs .nav-link {
    color: var(--cei-primary);
    font-weight: 500;
    border: 1px solid transparent;
    border-bottom: none;
    padding: 10px 20px;
    transition: all 0.2s;
}

.cei-tabs .nav-link:hover {
    background-color: var(--cei-bg);
    border-color: var(--cei-border);
}

.cei-tabs .nav-link.active {
    background-color: var(--cei-card-bg);
    border-color: var(--cei-primary) var(--cei-primary) var(--cei-card-bg);
    color: var(--cei-primary);
}

.cei-card {
    background-color: var(--cei-card-bg);
    border: 1px solid var(--cei-border);
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
    height: 100%;
}

.cei-card h5 {
    color: var(--cei-primary);
    margin-bottom: 12px;
}

.cei-card p {
    margin-bottom: 8px;
    color: #555;
}

.cei-card hr {
    margin: 15px 0;
    border-color: var(--cei-border);
}

.cei-btn-run {
    background-color: var(--cei-accent);
    border: none;
    width: 100%;
    padding: 10px;
    font-weight: 600;
    margin-top: 10px;
    transition: background-color 0.2s;
}

.cei-btn-run:hover {
    background-color: var(--cei-primary);
}

.cei-btn-run:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.cei-results {
    background-color: var(--cei-card-bg);
    border: 1px solid var(--cei-border);
    border-radius: 8px;
    padding: 20px;
    min-height: 400px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.cei-metric-card {
    background: linear-gradient(135deg, #f8fbff 0%, #eef5fc 100%);
    border: 1px solid var(--cei-border);
    border-radius: 8px;
    padding: 15px;
    text-align: center;
    margin-bottom: 15px;
}

.cei-metric-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--cei-primary);
}

.cei-metric-label {
    font-size: 0.85rem;
    color: #666;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.cei-metric-improvement {
    font-size: 0.9rem;
    color: var(--cei-success);
    font-weight: 500;
}

.cei-chart-container {
    position: relative;
    height: 250px;
    margin-bottom: 15px;
}

.cei-table {
    font-size: 0.85rem;
}

.cei-table th {
    background-color: var(--cei-primary);
    color: #fff;
}

.cei-spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.cei-loading-overlay {
    text-align: center;
    padding: 40px;
}

.cei-loading-overlay .spinner-border {
    width: 3rem;
    height: 3rem;
    color: var(--cei-accent);
}

.cei-alert {
    border-radius: 6px;
    padding: 10px 15px;
    margin-bottom: 10px;
}

.cei-summary-bar {
    background: var(--cei-primary);
    color: #fff;
    padding: 10px 20px;
    border-radius: 8px;
}

.cei-progress-bar {
    background-color: #e9ecef;
    border-radius: 4px;
    overflow: hidden;
    height: 24px;
    margin-bottom: 8px;
}

.cei-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--cei-success) 0%, var(--cei-accent) 100%);
    transition: width 0.5s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 0.8rem;
    font-weight: 600;
}

.cei-justification-card {
    border-left: 3px solid var(--cei-accent);
    padding: 10px 15px;
    margin-bottom: 10px;
    background-color: #f8fbff;
}

.cei-badge-risk-low { background-color: var(--cei-success); color: white; }
.cei-badge-risk-medium { background-color: var(--cei-warning); color: #333; }
.cei-badge-risk-high { background-color: var(--cei-danger); color: white; }