/* ==========================================================================
   KEYWORK v4 - Design Tokens (CSS Variables)
   ========================================================================== */

:root {
    /* ========== Colors ========== */

    /* Primary - Blue */
    --color-primary-50: #EFF6FF;
    --color-primary-100: #DBEAFE;
    --color-primary-200: #BFDBFE;
    --color-primary-300: #93C5FD;
    --color-primary-400: #60A5FA;
    --color-primary-500: #2563EB;
    --color-primary-600: #1D4ED8;
    --color-primary-700: #1E40AF;

    /* Secondary - Orange */
    --color-secondary-500: #F97316;
    --color-secondary-600: #EA580C;

    /* Gray */
    --color-gray-50: #F8FAFC;
    --color-gray-100: #F1F5F9;
    --color-gray-200: #E2E8F0;
    --color-gray-300: #CBD5E1;
    --color-gray-400: #94A3B8;
    --color-gray-500: #64748B;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1E293B;
    --color-gray-900: #0F172A;

    /* Semantic */
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    --color-info: #3B82F6;

    /* Background */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --bg-tertiary: #F1F5F9;

    /* Text */
    --text-primary: #1E293B;
    --text-secondary: #475569;
    --text-tertiary: #64748B;
    --text-muted: #94A3B8;
    --text-inverse: #FFFFFF;

    /* Border */
    --border-color: #E2E8F0;
    --border-color-dark: #CBD5E1;

    /* ========== Typography ========== */

    --font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* Font Sizes */
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 30px;

    /* Line Heights */
    --line-height-xs: 16px;
    --line-height-sm: 20px;
    --line-height-base: 24px;
    --line-height-lg: 28px;
    --line-height-xl: 28px;
    --line-height-2xl: 32px;
    --line-height-3xl: 36px;

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

    /* ========== Spacing ========== */

    --spacing-0: 0;
    --spacing-1: 4px;
    --spacing-2: 8px;
    --spacing-3: 12px;
    --spacing-4: 16px;
    --spacing-5: 20px;
    --spacing-6: 24px;
    --spacing-8: 32px;
    --spacing-10: 40px;
    --spacing-12: 48px;
    --spacing-16: 64px;

    /* ========== Border Radius ========== */

    --radius-sm: 4px;
    --radius-base: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;

    /* ========== Shadows ========== */

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-base: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --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);

    /* ========== Layout ========== */

    --container-max: 1500px;
    --container-padding: 16px;

    --header-height: 60px;
    --header-height-mobile: 50px;
    --nav-height: 48px;
    --nav-height-mobile: 44px;

    /* ========== Transitions ========== */

    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* ========== Z-Index ========== */

    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-toast: 600;
}

/* Dark Mode (optional - for future) */
@media (prefers-color-scheme: dark) {
    :root.dark-mode {
        --bg-primary: #0F172A;
        --bg-secondary: #1E293B;
        --bg-tertiary: #334155;
        --text-primary: #F1F5F9;
        --text-secondary: #CBD5E1;
        --text-tertiary: #94A3B8;
        --border-color: #334155;
    }
}