:root {
    /* --- Colors --- */
    /* Primary (Trust/Medical/Global) */
    --primary-dark: #003366;  /* Deep Navy */
    --primary-main: #0056b3;  /* Core Blue */
    --primary-light: #e6f0fa; /* Light Background Tint */
    --primary-hover: #004494;

    /* Accent (Calm/Care) */
    --accent-teal: #008080;
    --accent-light: #e0f2f1;

    /* Neutrals */
    --text-main: #212529;
    --text-muted: #6c757d;
    --text-light: #f8f9fa;
    --bg-body: #ffffff;
    --bg-alt: #f8f9fa;
    --bg-dark: #1a1a1a;
    --border-color: #dee2e6;

    /* Semantic */
    --success: #198754;
    --error: #dc3545;
    --warning: #ffc107;

    /* --- Typography --- */
    --font-primary: 'Segoe UI', system-ui, -apple-system, sans-serif;
    --font-heading: 'Segoe UI', system-ui, -apple-system, sans-serif;

    /* Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 2rem;
    --text-4xl: 2.5rem;

    /* Helpers */
    --leading-tight: 1.2;
    --leading-normal: 1.5;
    --leading-loose: 1.7;

    /* --- Spacing --- */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.5rem;
    --space-6: 2rem;
    --space-8: 3rem;
    --space-10: 4rem;
    --space-12: 5rem;

    /* --- Shadows & Radius --- */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-card: 22px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1);
    --shadow-card: 0 8px 30px rgba(0,0,0,0.08);

    /* --- Transitions --- */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
}

@media (prefers-color-scheme: dark) {
    /* Optional: Basic Dark Mode override readiness if user enables it later */
    /* For now, keeping default light as per request "light mode default" */
}