/**
 * ETERON Design System - CSS Variables
 * =====================================
 * Centralized design tokens for the entire application.
 * All CSS files should reference these variables for consistency.
 */

:root {
    /* ============================================
       PRIMARY BRAND COLORS - Neutral Slate Theme
       Clean, professional business application
       ============================================ */
    --color-primary: #475569;          /* Slate Gray */
    --color-primary-light: #64748b;    /* Light Slate */
    --color-primary-dark: #334155;     /* Dark Slate */
    --color-primary-darker: #1e293b;   /* Very Dark Slate */
    --color-primary-rgb: 71, 85, 105;

    /* Primary with opacity variants */
    --color-primary-10: rgba(71, 85, 105, 0.1);
    --color-primary-20: rgba(71, 85, 105, 0.2);
    --color-primary-30: rgba(71, 85, 105, 0.3);

    /* ============================================
       SEMANTIC COLORS
       ============================================ */
    --color-success: #28a745;
    --color-success-light: #34ce57;
    --color-success-dark: #1e7e34;
    --color-success-bg: rgba(40, 167, 69, 0.1);

    --color-warning: #ffc107;
    --color-warning-light: #ffcd39;
    --color-warning-dark: #d39e00;
    --color-warning-bg: rgba(255, 193, 7, 0.1);

    --color-danger: #dc3545;
    --color-danger-light: #e4606d;
    --color-danger-dark: #bd2130;
    --color-danger-bg: rgba(220, 53, 69, 0.1);

    --color-info: #17a2b8;
    --color-info-light: #3ab0c3;
    --color-info-dark: #117a8b;
    --color-info-bg: rgba(23, 162, 184, 0.1);

    /* ============================================
       NEUTRAL COLORS (Gray Scale)
       ============================================ */
    --color-white: #ffffff;
    --color-black: #000000;

    --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;

    /* ============================================
       BACKGROUND COLORS - Clean White Theme
       ============================================ */
    --bg-body: #ffffff;              /* Pure white body */
    --bg-card: #ffffff;
    --bg-card-hover: #fafafa;
    --bg-sidebar: #1a1a1a;           /* Near black sidebar */
    --bg-sidebar-hover: #2d2d2d;
    --bg-input: #ffffff;
    --bg-input-focus: #fff7ed;       /* Very light orange tint on focus */

    /* Glass morphism backgrounds */
    --bg-glass: rgba(255, 255, 255, 0.98);
    --bg-glass-dark: rgba(26, 26, 26, 0.95);
    --bg-overlay: rgba(0, 0, 0, 0.6);

    /* ============================================
       TEXT COLORS
       ============================================ */
    --text-primary: #111827;
    --text-secondary: #4b5563;
    --text-muted: #6b7280;
    --text-light: #9ca3af;
    --text-inverse: #ffffff;
    --text-link: var(--color-primary);
    --text-link-hover: var(--color-primary-dark);

    /* ============================================
       BORDER COLORS
       ============================================ */
    --border-light: #e5e7eb;
    --border-medium: #d1d5db;
    --border-dark: #9ca3af;
    --border-focus: var(--color-primary);

    /* ============================================
       SHADOW SYSTEM
       ============================================ */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-sm: 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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* Colored shadows - Orange theme */
    --shadow-primary: 0 4px 14px rgba(249, 115, 22, 0.3);
    --shadow-success: 0 4px 14px rgba(40, 167, 69, 0.25);
    --shadow-danger: 0 4px 14px rgba(220, 53, 69, 0.25);

    /* ============================================
       SPACING SYSTEM (8px base)
       ============================================ */
    --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 */

    /* ============================================
       TYPOGRAPHY SYSTEM
       ============================================ */
    --font-family-base: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
    --font-family-mono: 'Consolas', 'Monaco', 'Courier New', 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 weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

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

    /* ============================================
       BORDER RADIUS SYSTEM
       ============================================ */
    --radius-none: 0;
    --radius-sm: 0.25rem;   /* 4px */
    --radius-md: 0.5rem;    /* 8px */
    --radius-lg: 0.75rem;   /* 12px */
    --radius-xl: 1rem;      /* 16px */
    --radius-2xl: 1.5rem;   /* 24px */
    --radius-full: 9999px;

    /* ============================================
       TRANSITIONS
       ============================================ */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;
    --transition-all: all 200ms ease;

    /* ============================================
       Z-INDEX SCALE
       ============================================ */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;

    /* ============================================
       COMPONENT-SPECIFIC TOKENS
       ============================================ */

    /* Sidebar */
    --sidebar-width: 280px;
    --sidebar-collapsed-width: 70px;

    /* Cards */
    --card-padding: var(--space-6);
    --card-radius: var(--radius-xl);
    --card-shadow: var(--shadow-md);

    /* Buttons */
    --btn-padding-y: var(--space-2);
    --btn-padding-x: var(--space-4);
    --btn-radius: var(--radius-md);
    --btn-font-weight: var(--font-weight-semibold);

    /* Form controls */
    --input-padding-y: var(--space-2);
    --input-padding-x: var(--space-3);
    --input-radius: var(--radius-md);
    --input-border-width: 1px;
    --input-min-height: 44px;

    /* Tables */
    --table-cell-padding: var(--space-3) var(--space-4);
    --table-border-color: var(--border-light);

    /* Modals */
    --modal-radius: var(--radius-xl);
    --modal-padding: var(--space-6);
}

/* ============================================
   DARK MODE SUPPORT (Optional)
   ============================================ */
@media (prefers-color-scheme: dark) {
    :root.auto-dark {
        --bg-body: #111827;
        --bg-card: #1f2937;
        --bg-card-hover: #374151;
        --text-primary: #f9fafb;
        --text-secondary: #d1d5db;
        --text-muted: #9ca3af;
        --border-light: #374151;
        --border-medium: #4b5563;
    }
}