/* ==========================================================================
   CSS Variables & Design Tokens - DiabetPerio Redesign
   ========================================================================== */

:root {
    /* --- Color Palette --- */
    /* Primary brand colors - Professional Medical Blue/Teal */
    --color-primary-50:  #f0fdfa;
    --color-primary-100: #ccfbf1;
    --color-primary-500: #14b8a6;   /* Teal accent */
    --color-primary-600: #0d9488;
    --color-primary-700: #0f766e;
    
    --color-brand-blue:  #1e3a8a;   /* Trustworthy deep blue */
    --color-brand-blue-hover: #1e40af;
    --color-brand-accent: #3b82f6;

    /* Neutrals / Grayscale */
    --color-gray-50:  #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-500: #64748b;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    /* Backgrounds */
    --bg-main: var(--color-gray-50);
    --bg-surface: #ffffff;
    --bg-alt: var(--color-gray-100);

    /* Text */
    --text-primary: var(--color-gray-900);
    --text-secondary: var(--color-gray-600);
    --text-inverse: #ffffff;

    /* Borders */
    --border-light: var(--color-gray-200);

    /* --- Typography --- */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-heading: 'Outfit', var(--font-sans);

    --text-xs:   0.75rem;   /* 12px */
    --text-sm:   0.875rem;  /* 14px */
    --text-base: 1rem;      /* 16px */
    --text-lg:   1.125rem;  /* 18px */
    --text-xl:   1.25rem;   /* 20px */
    --text-2xl:  1.5rem;    /* 24px */
    --text-3xl:  1.875rem;  /* 30px */
    --text-4xl:  2.25rem;   /* 36px */
    --text-5xl:  3rem;      /* 48px */
    
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* --- Spacing --- */
    --space-1: 0.25rem;  /* 4px */
    --space-2: 0.5rem;   /* 8px */
    --space-3: 0.75rem;  /* 12px */
    --space-4: 1rem;     /* 16px */
    --space-6: 1.5rem;   /* 24px */
    --space-8: 2rem;     /* 32px */
    --space-10: 2.5rem;  /* 40px */
    --space-12: 3rem;    /* 48px */
    --space-16: 4rem;    /* 64px */
    --space-24: 6rem;    /* 96px */

    /* --- Layout & Utilities --- */
    --container-width: 1200px;
    --container-padding: var(--space-4);
    --border-radius-sm: 0.375rem;
    --border-radius-md: 0.5rem;
    --border-radius-lg: 1rem;
    --border-radius-xl: 1.5rem;
    --border-radius-pill: 9999px;

    /* --- Shadows & Effects --- */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-hover: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.4);
    --glass-blur: blur(12px);

    /* --- Animations --- */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Base resets handled in style.css */