:root {
    /* Brand Palette: Deep Red, Deep Charcoal, Warm Off-White */
    --color-brand: #A91D36; /* deep red (urgent) */
    --color-brand-dark: #811327;
    --color-brand-light: #E03554;

    --color-ink: #1C1F22; /* deep charcoal */
    --color-ink-light: #3A4047;
    --color-ink-lighter: #606871;

    --color-paper: #F8F7F4; /* warm off-white */
    --color-paper-dim: #EFECE6;
    --color-paper-dark: #E2DDD5;

    --color-white: #FFFFFF;
    --color-black: #000000;

    --color-focus: #005FCC;
    --color-error: #D92B2B;
    --color-success: #218338;
    --color-warning: #B38600;

    /* Typography */
    /* Fonts should be preloaded natively in HTML */
    --font-display: 'Merriweather', Georgia, serif;
    --font-text: 'Public Sans', system-ui, -apple-system, sans-serif;

    /* Typographic Scale */
    --text-xs: 0.75rem;     /* 12px */
    --text-sm: 0.875rem;    /* 14px */
    --text-base: 1.125rem;  /* 18px */
    --text-lg: 1.25rem;     /* 20px */
    --text-xl: 1.5rem;      /* 24px */
    --text-2xl: 2rem;       /* 32px */
    --text-3xl: 2.5rem;     /* 40px */
    --text-4xl: 3rem;       /* 48px */
    --text-5xl: 4rem;       /* 64px */

    /* Line Heights */
    --leading-tight: 1.1;
    --leading-snug: 1.3;
    --leading-normal: 1.6;
    --leading-relaxed: 1.8;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-24: 6rem;
    --space-32: 8rem;

    /* Borders */
    --radius-sm: 2px;
    --radius-md: 4px;
    --border-thin: 1px solid var(--color-ink-lighter);
    --border-thick: 3px solid var(--color-ink);

    /* Layout Constraints */
    --container-max: 1200px;
    --container-reading: 720px;
    --container-narrow: 560px;
}