/* Base styles with theme support */
:root {
    /* Light mode variables */
    --color-background: #ffffff;
    --color-text: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-primary-light: #93c5fd;
    --color-accent: #10b981;
    --color-accent-dark: #059669;
    --color-accent-light: #6ee7b7;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;

    /* Animation durations */
    --transition-fast: 150ms;
    --transition-normal: 300ms;
    --transition-slow: 500ms;
}

.dark {
    /* Dark mode variables */
    --color-background: #0f172a;
    --color-text: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-border: #334155;
    --color-primary: #3b82f6;
    --color-primary-dark: #2563eb;
    --color-primary-light: #93c5fd;
    --color-accent: #10b981;
    --color-accent-dark: #059669;
    --color-accent-light: #6ee7b7;
}

/* Smooth transitions for theme changes */
body,
.transition-theme {
    transition-property: background-color, border-color, color, fill, stroke;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
    transition-duration: var(--transition-normal);
}

/* Progress bar animation */
.progress-bar-animated::after {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* Number counter animation */
.counter-animate {
    font-variant-numeric: tabular-nums;
}

/* Chart container styling */
.chart-container {
    position: relative;
    background: rgba(255, 255, 255, 0.8);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    border-radius: 1rem;
    padding: 1.5rem;
    box-shadow: 0 10px 25px -3px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.dark .chart-container {
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* Focus styles for accessibility */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Skip to content link for accessibility */
.skip-to-content {
    position: absolute;
    top: -9999px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: white;
    padding: 0.5rem 1rem;
    z-index: 100;
    border-radius: 0 0 0.25rem 0.25rem;
}

.skip-to-content:focus {
    top: 0;
}