/* ==========================================
   ACCESSIBILITY: Screen Reader Only
   ========================================== */
/* This class hides content visually but keeps it available to screen readers */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* ==========================================
   BASE STYLES
   ========================================== */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 20px;
    background-color: #f0f2f5;
}

h1 {
    color: #2c3e50;
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 40px;
}

/* ==========================================
   KPI CONTAINER
   ========================================== */
.kpi-container {
    display: flex;
    gap: 30px;
    justify-content: center;
    max-width: 800px;
    margin: 0 auto;
}

/* ==========================================
   KPI CARDS
   ========================================== */
.kpi-card {
    background-color: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    text-align: center;
    flex: 1;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

/* ACCESSIBILITY: Hover AND Focus states for both mouse and keyboard users */
.kpi-card:hover,
.kpi-card:focus-within {
    transform: translateY(-5px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    outline: 2px solid #3498db;  /* Visible focus indicator */
    outline-offset: 2px;
}

/* ==========================================
   KPI CONTENT
   ========================================== */
.kpi-number {
    font-size: 3rem;
    font-weight: bold;
    color: #3498db;
    margin: 0 0 10px 0;
}

/* ACCESSIBILITY: Darker gray for better color contrast (WCAG AA compliant) */
.kpi-label {
    font-size: 0.9rem;
    color: #5a6c7d;  /* Passes WCAG contrast ratio */
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* ==========================================
   ACCESSIBILITY: Reduced Motion
   ========================================== */
/* Respects user's operating system preference for reduced motion */
@media (prefers-reduced-motion: reduce) {
    .kpi-card {
        transition: none;
    }
    .kpi-card:hover,
    .kpi-card:focus-within {
        transform: none;  /* No lifting animation */
    }
}

/* ==========================================
   ACCESSIBILITY: Focus Styles
   ========================================== */
/* Ensure all interactive elements have visible focus indicators */
*:focus {
    outline: 2px solid #3498db;
    outline-offset: 2px;
}

/* Remove default focus style only if we're providing a custom one */
*:focus:not(:focus-visible) {
    outline: none;
}

*:focus-visible {
    outline: 2px solid #3498db;
    outline-offset: 2px;
}
/* ==========================================
   CHARTS SECTION
   ========================================== */
.charts-row {
    display: flex;
    gap: 30px;
    max-width: 1200px;
    margin: 40px auto;
}

.chart-container {
    background-color: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    flex: 1;
}

.chart-container-full {
    background-color: white;
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
    max-width: 1200px;
    margin: 0 auto 40px auto;
}

.chart-container h3,
.chart-container-full h3 {
    color: #2c3e50;
    font-size: 1.2rem;
    margin: 0 0 20px 0;
    text-align: center;
}

/* Reduced motion for charts */
@media (prefers-reduced-motion: reduce) {
    canvas {
        animation: none !important;
    }
}