:root {

    /* =========================
       COLORS - BRAND SYSTEM
    ========================== */

    --color-primary: #2563eb;
    --color-primary-hover: #1d4ed8;

    --color-secondary: #64748b;

    --color-background: #ffffff;
    --color-surface: #f8fafc;

    --color-text: #0f172a;
    --color-text-muted: #64748b;

    --color-border: #e2e8f0;

    --color-success: #16a34a;
    --color-warning: #f59e0b;
    --color-danger: #dc2626;



    /* =========================
       TYPOGRAPHY
    ========================== */

    --font-primary: "Inter", sans-serif;

    --font-size-xs: 0.75rem;      /* 12px */
    --font-size-sm: 0.875rem;     /* 14px */
    --font-size-base: 1rem;       /* 16px */
    --font-size-lg: 1.125rem;     /* 18px */
    --font-size-xl: 1.25rem;      /* 20px */
    --font-size-2xl: 1.5rem;      /* 24px */
    --font-size-3xl: 2rem;        /* 32px */
    --font-size-4xl: 3rem;        /* 48px */


    /* Heading line heights */

    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-loose: 1.8;



    /* =========================
       SPACING SYSTEM
    ========================== */

    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    --space-20: 5rem;     /* 80px */



    /* =========================
       CONTAINER
    ========================== */

    --container-width: 1200px;

    --container-padding: 1.5rem;



    /* =========================
       BORDER
    ========================== */

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-full: 999px;



    /* =========================
       SHADOW
    ========================== */

    --shadow-sm:
    0 1px 2px rgba(0,0,0,0.05);

    --shadow-md:
    0 4px 12px rgba(0,0,0,0.1);

    --shadow-lg:
    0 10px 30px rgba(0,0,0,0.15);



    /* =========================
       TRANSITION
    ========================== */

    --transition-fast: 150ms ease;

    --transition-normal: 300ms ease;



    /* =========================
       Z INDEX
    ========================== */

    --z-navbar: 100;
    --z-modal: 200;
    --z-tooltip: 300;

}