/* ========================================
   CSS Variables - Design System Tokens
   ======================================== */

:root {
    /* ===== Color Palette ===== */
    /* Primary Colors */
    --color-primary: #6366F1;
    --color-primary-light: #818CF8;
    --color-primary-dark: #4F46E5;
    --color-primary-rgb: 99, 102, 241;

    /* Secondary Colors */
    --color-secondary: #8B5CF6;
    --color-secondary-light: #A78BFA;
    --color-secondary-dark: #7C3AED;

    /* Accent Colors */
    --color-accent: #06B6D4;
    --color-accent-light: #22D3EE;
    --color-accent-dark: #0891B2;

    /* Neutral Colors */
    --color-dark: #0F172A;
    --color-dark-light: #1E293B;
    --color-dark-lighter: #334155;
    --color-light: #F5F7FA;
    --color-light-dark: #EEF2F6;
    --color-light-darker: #E2E8F0;

    /* Text Colors */
    --color-text-primary: #1E293B;
    --color-text-secondary: #64748B;
    --color-text-light: #94A3B8;
    --color-text-white: #FAFBFC;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-accent) 100%);
    --gradient-hero: linear-gradient(135deg, #667eea 0%, #764ba2 100%);

    /* ===== Typography ===== */
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', sans-serif;
    --font-family-heading: 'Inter', sans-serif;

    /* Font Sizes */
    --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: 1.875rem;
    /* 30px */
    --font-size-4xl: 2.25rem;
    /* 36px */
    --font-size-5xl: 3rem;
    /* 48px */
    --font-size-6xl: 3.75rem;
    /* 60px */

    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;

    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* ===== Spacing ===== */
    --spacing-xs: 0.25rem;
    /* 4px */
    --spacing-sm: 0.5rem;
    /* 8px */
    --spacing-md: 1rem;
    /* 16px */
    --spacing-lg: 1.5rem;
    /* 24px */
    --spacing-xl: 2rem;
    /* 32px */
    --spacing-2xl: 3rem;
    /* 48px */
    --spacing-3xl: 4rem;
    /* 64px */
    --spacing-4xl: 6rem;
    /* 96px */
    --spacing-5xl: 8rem;
    /* 128px */

    /* ===== Borders ===== */
    --border-radius-sm: 0.375rem;
    /* 6px */
    --border-radius-md: 0.5rem;
    /* 8px */
    --border-radius-lg: 0.75rem;
    /* 12px */
    --border-radius-xl: 1rem;
    /* 16px */
    --border-radius-2xl: 1.5rem;
    /* 24px */
    --border-radius-full: 9999px;

    --border-width: 1px;
    --border-width-thick: 2px;

    /* ===== Shadows ===== */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 40px rgba(var(--color-primary-rgb), 0.3);

    /* ===== Transitions ===== */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* ===== Z-Index ===== */
    --z-index-dropdown: 1000;
    --z-index-sticky: 1020;
    --z-index-fixed: 1030;
    --z-index-modal-backdrop: 1040;
    --z-index-modal: 1050;
    --z-index-popover: 1060;
    --z-index-tooltip: 1070;

    /* ===== Breakpoints (for JS) ===== */
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;

    /* ===== Layout ===== */
    --container-max-width: 1280px;
    --container-padding: var(--spacing-lg);

    /* ===== Header ===== */
    --header-height: 80px;
}

/* ===== Dark Mode Variables ===== */
@media (prefers-color-scheme: dark) {
    :root {
        --color-dark: #F8FAFC;
        --color-dark-light: #F1F5F9;
        --color-dark-lighter: #E2E8F0;
        --color-light: #0F172A;
        --color-light-dark: #1E293B;
        --color-light-darker: #334155;

        --color-text-primary: #F8FAFC;
        --color-text-secondary: #CBD5E1;
        --color-text-light: #94A3B8;

        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
        --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
    }
}