/* ============================================
   CSS CUSTOM PROPERTIES (DESIGN SYSTEM)
   Graphisoft-inspired Design Variables
   ============================================ */

:root {
    /* ===== Color Palette ===== */

    /* Primary Colors */
    --color-primary: #0066CC;
    /* Graphisoft Blue */
    --color-primary-dark: #0052A3;
    --color-primary-light: #3385D6;

    /* Secondary Colors */
    --color-secondary: #00C853;
    /* Success/Accent Green */
    --color-secondary-dark: #00A844;
    --color-secondary-light: #33D372;

    /* Neutral Colors */
    --color-white: #FFFFFF;
    --color-black: #000000;
    --color-gray-50: #FAFAFA;
    --color-gray-100: #F5F5F5;
    --color-gray-200: #EEEEEE;
    --color-gray-300: #E0E0E0;
    --color-gray-400: #BDBDBD;
    --color-gray-500: #9E9E9E;
    --color-gray-600: #757575;
    --color-gray-700: #616161;
    --color-gray-800: #424242;
    --color-gray-900: #212121;

    /* Text Colors */
    --color-text-primary: #1A1A1A;
    --color-text-secondary: #666666;
    --color-text-tertiary: #999999;
    --color-text-inverse: #FFFFFF;

    /* Background Colors */
    --color-bg-primary: #FFFFFF;
    --color-bg-secondary: #F5F5F5;
    --color-bg-tertiary: #FAFAFA;
    --color-bg-dark: #1A1A1A;

    /* Border Colors */
    --color-border-light: #E0E0E0;
    --color-border-medium: #BDBDBD;
    --color-border-dark: #757575;

    /* Status Colors */
    --color-success: #00C853;
    --color-error: #D32F2F;
    --color-warning: #FFA000;
    --color-info: #0066CC;

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

    /* Font Families */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    --font-secondary: 'Inter', sans-serif;
    --font-mono: 'SF Mono', 'Monaco', 'Inconsolata', monospace;

    /* 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-size-7xl: 4.5rem;
    /* 72px */

    /* Font Weights */
    --font-weight-light: 300;
    --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: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    --line-height-loose: 2;

    /* Letter Spacing */
    --letter-spacing-tight: -0.02em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.025em;
    --letter-spacing-wider: 0.05em;

    /* ===== Spacing System (8px grid) ===== */
    --space-0: 0;
    --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 */
    --space-24: 6rem;
    /* 96px */
    --space-32: 8rem;
    /* 128px */
    --space-40: 10rem;
    /* 160px */

    /* ===== Border Radius ===== */
    --radius-none: 0;
    --radius-sm: 0.125rem;
    /* 2px */
    --radius-base: 0.25rem;
    /* 4px */
    --radius-md: 0.375rem;
    /* 6px */
    --radius-lg: 0.5rem;
    /* 8px */
    --radius-xl: 0.75rem;
    /* 12px */
    --radius-2xl: 1rem;
    /* 16px */
    --radius-3xl: 1.5rem;
    /* 24px */
    --radius-full: 9999px;

    /* ===== Shadows ===== */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-base: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-2xl: 0 50px 100px -20px rgba(0, 0, 0, 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.06);
    --shadow-none: none;

    /* ===== Transitions ===== */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slowest: 500ms cubic-bezier(0.4, 0, 0.2, 1);

    /* ===== Z-Index Layers ===== */
    --z-base: 0;
    --z-dropdown: 1000;
    --z-sticky: 1100;
    --z-fixed: 1200;
    --z-modal-backdrop: 1300;
    --z-modal: 1400;
    --z-popover: 1500;
    --z-toast: 1600;
    --z-tooltip: 1700;

    /* ===== Container Widths ===== */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1536px;
    --container-max: 1920px;

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

    /* ===== Gradients ===== */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-secondary-dark) 100%);
    --gradient-overlay: linear-gradient(to bottom, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.5) 100%);
    --gradient-overlay-reverse: linear-gradient(to top, rgba(0, 0, 0, 0) 0%, rgba(0, 0, 0, 0.5) 100%);

    /* ===== Header Heights ===== */
    --header-height: 72px;
    --header-height-mobile: 64px;

    /* ===== Layout ===== */
    --gutter: var(--space-6);
    --gutter-mobile: var(--space-4);
    --section-padding-y: var(--space-24);
    --section-padding-y-mobile: var(--space-16);
}

/* ===== Dark Mode Variables ===== */
@media (prefers-color-scheme: dark) {
    :root[data-theme="dark"] {
        /* Dark mode color overrides */
        --color-bg-primary: #1A1A1A;
        --color-bg-secondary: #212121;
        --color-bg-tertiary: #2A2A2A;
        --color-text-primary: #FFFFFF;
        --color-text-secondary: #B0B0B0;
        --color-text-tertiary: #808080;
        --color-border-light: #333333;
        --color-border-medium: #444444;
        --color-border-dark: #555555;
    }
}

/* ===== Print Variables ===== */
@media print {
    :root {
        --shadow-xs: none;
        --shadow-sm: none;
        --shadow-base: none;
        --shadow-md: none;
        --shadow-lg: none;
        --shadow-xl: none;
        --shadow-2xl: none;
    }
}