:root {
    /* Color Palette */
    --primary: #ff6b00;
    /* Bright Orange */
    --primary-hover: #e65100;
    --primary-focus: rgba(255, 107, 0, 0.25);
    --primary-inverse: #ffffff;

    --secondary: #00b8d4;
    /* Teal/Cyan */
    --secondary-hover: #008ba3;
    --secondary-inverse: #ffffff;

    --background: #f8f9fa;
    /* Light Gray */
    --surface: #ffffff;
    --surface-hover: #f1f3f5;

    --text: #212529;
    --text-muted: #6c757d;
    --text-inverse: #ffffff;

    --border: #dee2e6;
    --border-hover: #adb5bd;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;

    /* Typography */
    --font-family: 'Inter', system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-size-base: 16px;
    --line-height: 1.5;
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --border-radius-pill: 50rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

/* CSV Loading Spinner */
.spinner {
    border: 4px solid #f3f3f3;
    border-top: 4px solid var(--primary);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 1rem auto;
}

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