:root {
    --bg-color: #f4f6f9;
    --card-bg: #ffffff;
    --text-primary: #2c3e50;
    --text-secondary: #7f8c8d;
    --accent-blue: #3498db;
    --accent-green: #2ecc71;
    --accent-red: #e74c3c;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
}

header {
    background: white;
    padding: 1rem 2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

h1 {
    margin: 0;
    font-size: 1.5rem;
    color: var(--text-primary);
}

#last-updated {
    margin: 0.5rem 0 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.dashboard-container {
    max-width: 1400px;
    margin: 2rem auto;
    padding: 0 1rem;
}

/* KPI STRIP */
.kpi-strip {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.kpi-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    transition: transform 0.2s;
}

.kpi-card:hover {
    transform: translateY(-2px);
}

.kpi-title {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.kpi-value {
    font-size: 2rem;
    font-weight: bold;
    margin: 0.5rem 0;
    color: var(--text-primary);
}

.kpi-trend {
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.trend-up {
    color: var(--accent-green);
}

.trend-down {
    color: var(--accent-red);
}

/* CHARTS GRID */
.charts-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

@media (max-width: 900px) {
    .charts-grid {
        grid-template-columns: 1fr;
    }
}

.chart-card {
    background: var(--card-bg);
    padding: 1.5rem;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    min-height: 400px;
    display: flex;
    flex-direction: column;
}

.chart-card.full-width {
    grid-column: 1 / -1;
}

.chart-card h3 {
    margin: 0 0 1rem;
    font-size: 1.1rem;
    font-weight: 600;
}

.chart-div {
    flex: 1;
    width: 100%;
    min-height: 350px;
}

footer {
    text-align: left;
    padding: 2rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.references-list {
    text-align: left;
    margin-top: 1rem;
    padding-inline-start: 2rem;
}

.references-list li {
    margin-bottom: 0.5rem;
    padding-left: 0.5rem;
}