/* CSS Custom Properties */
:root {
    /* Colors - Primary (Marine Blue) */
    --color-primary-50: #e6f0ff;
    --color-primary-100: #b3d7ff;
    --color-primary-200: #80beff;
    --color-primary-300: #4da5ff;
    --color-primary-400: #1a8cff;
    --color-primary-500: #0066cc;
    --color-primary-600: #004d99;
    --color-primary-700: #003366;
    --color-primary-800: #001a33;
    --color-primary-900: #000d1a;

    /* Colors - Accent (Nautical Gold) */
    --color-accent-500: #f59e0b;
    --color-accent-600: #d97706;

    /* Colors - Success/Danger/Warning */
    --color-success: #10b981;
    --color-success-dark: #059669;
    --color-danger: #ef4444;
    --color-danger-dark: #dc2626;
    --color-warning: #f59e0b;
    --color-warning-dark: #d97706;

    /* Colors - Neutrals */
    --color-white: #ffffff;
    --color-gray-50: #f9fafb;
    --color-gray-100: #f3f4f6;
    --color-gray-200: #e5e7eb;
    --color-gray-300: #d1d5db;
    --color-gray-400: #9ca3af;
    --color-gray-500: #6b7280;
    --color-gray-600: #4b5563;
    --color-gray-700: #374151;
    --color-gray-800: #1f2937;
    --color-gray-900: #111827;

    /* Typography */
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;

    --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-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* 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 */

    /* Border Radius */
    --radius-sm: 0.25rem;    /* 4px */
    --radius-md: 0.5rem;     /* 8px */
    --radius-lg: 0.75rem;    /* 12px */
    --radius-xl: 1rem;       /* 16px */
    --radius-full: 9999px;

    /* 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);

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

    /* Z-Index */
    --z-dropdown: 1000;
    --z-modal: 2000;
    --z-toast: 3000;
    --z-loading: 4000;

    /* Container */
    --container-max-width: 1280px;
    --container-padding: var(--spacing-md);

    /* Header */
    --header-height: 64px;

    /* Sidebar */
    --sidebar-width: 280px;
}

/* Dark mode support (future enhancement) */
@media (prefers-color-scheme: dark) {
    :root {
        /* Could add dark mode variables here */
    }
}